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# Local parameter of a point on a hyperelliptic curve

Let $Y$ be the affine plane curve given by the equation $y^2=F(x)$, where $F$ is a polynomial in one variable of odd degree over a field of characteristic not equal to 2. Let $\xi\in Y$.

1. Suppose $y(\xi)\neq0$. Then why is $x$ a local parameter at $\xi$?
2. Suppose $y(\xi)=0$. Then why is $y$ a local parameter at $\xi$?
-
Are you missing an assumption on distinct roots? I don't think the second claim is true when $F(x)=0$ has roots with nontrivial multiplicity. –  Alon Amit May 5 '12 at 7:03
Yes, exactly as you pointed out, $F$ should not have any repeated roots. –  Alan Lee May 5 '12 at 7:30

Put $G(x,y)=y^2-F(x)$. Now if $y(\xi)\ne 0$, then $\partial G/\partial y\ne0$ at $\xi$, so $x$ is a local parameter at $\xi$ by the implicit function theorem ($y$ can be locally eliminated from $G(x,y)=0$). If $y(\xi)=0$, then $\partial G/\partial x=-dF/dx\ne0$ at $\xi$ since $x$ is not a multiple root of $F$. Hence, $x$ can be eliminated and $y$ is a local parameter.


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1
AIEEE 2004
+4
-1
If $$a \ne 0$$ and the line $$2bx+3cy+4d=0$$ passes through the points of intersection of the parabolas $${y^2} = 4ax$$ and $${x^2} = 4ay$$, then
A
$${d^2} + {\left( {3b - 2c} \right)^2} = 0$$
B
$${d^2} + {\left( {3b + 2c} \right)^2} = 0$$
C
$${d^2} + {\left( {2b - 3c} \right)^2} = 0$$
D
$${d^2} + {\left( {2b + 3c} \right)^2} = 0$$
2
AIEEE 2004
+4
-1
The eccentricity of an ellipse, with its centre at the origin, is $${1 \over 2}$$. If one of the directrices is $$x=4$$, then the equation of the ellipse is:
A
$$4{x^2} + 3{y^2} = 1$$
B
$$3{x^2} + 4{y^2} = 12$$
C
$$4{x^2} + 3{y^2} = 12$$
D
$$3{x^2} + 4{y^2} = 1$$
3
AIEEE 2003
+4
-1
The normal at the point$$\left( {bt_1^2,2b{t_1}} \right)$$ on a parabola meets the parabola again in the point $$\left( {bt_2^2,2b{t_2}} \right)$$, then
A
$${t_2} = {t_1} + {2 \over {{t_1}}}$$
B
$${t_2} = -{t_1} - {2 \over {{t_1}}}$$
C
$${t_2} = -{t_1} + {2 \over {{t_1}}}$$
D
$${t_2} = {t_1} - {2 \over {{t_1}}}$$
4
AIEEE 2003
+4
-1
The foci of yhe ellipse $${{{x^2}} \over {16}} + {{{y^2}} \over {{b^2}}} = 1$$ and the hyperbola $${{{x^2}} \over {144}} - {{{y^2}} \over {81}} = {1 \over {25}}$$ coincide. Then the value of $${b^2}$$ is
A
$$9$$
B
$$1$$
C
$$5$$
D
$$7$$
JEE Main Subjects
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Geodesic Triangulation for Image Compression

# Geodesic Triangulation for Image Compression

This tour explores the use geodesic triangulations to perform image compression.

## Installing toolboxes and setting up the path.

You need to download the following files: signal toolbox, general toolbox and graph toolbox.

You need to unzip these toolboxes in your working directory, so that you have toolbox_signal, toolbox_general and toolbox_graph in your directory.

For Scilab user: you must replace the Matlab comment '%' by its Scilab counterpart '//'.

Recommandation: You should create a text file named for instance numericaltour.sce (in Scilab) or numericaltour.m (in Matlab) to write all the Scilab/Matlab command you want to execute. Then, simply run exec('numericaltour.sce'); (in Scilab) or numericaltour; (in Matlab) to run the commands.

Execute this line only if you are using Matlab.

getd = @(p)path(p,path); % scilab users must *not* execute this

Then you can add the toolboxes to the path.

getd('toolbox_signal/');
getd('toolbox_general/');
getd('toolbox_graph/');

## Image Approximation with Triangulation

It is possible to approximate an image over a triangulation using piecewise linear splines.

name = 'cameraman';
n = 256;
M = rescale( load_image(name, n) );

Number of points used to compute the approximation. The more points, the smallest the error.

m = 400;

Seeds random points, include the corners into these points.

vertex = floor( rand(2,m-4)*(n-1) ) +1;
vertex(:,end+1:end+4) = [[1;1] [1;n] [n;n] [n;1]];

Compute a Delaunay triangulation.

faces = compute_delaunay(vertex);

A first way to perform an approximation with m triangles is to interpolate the image at the sampling points vertex.

vinterp = interp2(M, vertex(2,:), vertex(1,:));

Each vinterp(i) is the value of the approximating image at the vertex(:,i). We compute a spline interpolation.

Minterp = compute_triangulation_interpolation(faces,vertex,vinterp, n);

Display the approximation.

clf;
subplot(1,2,1);
plot_triangulation(vertex,faces, M);
title('Triangulation');
subplot(1,2,2);
imageplot(clamp(Minterp), ['Interpolation, SNR=' num2str(snr(Minterp,M)) 'dB']);

Another, better way to compute the approximation is to compute coefficients vapprox that performs the best L2 approximation with linear spline.

vapprox = compute_orthoproj_triangulation(vertex, faces, M);
Mapprox = compute_triangulation_interpolation(faces,vertex,vapprox, n);

Compare interpolation and approximation.

clf;
imageplot(clamp(Minterp), ['Interpolation, SNR=' num2str(snr(Minterp,M),3) 'dB'], 1,2,1);
imageplot(clamp(Mapprox), ['Approximation, SNR=' num2str(snr(Mapprox,M),3) 'dB'], 1,2,2);

## Isotropic Metrics for Image Approximation

It is possible to compute optimized sampling location vertex by using the farthest point sampling algorithm with a well chosen metric W so that more points are put in areas of strong gradient.

The metric will be of the form

where epsilon and alpha control the density variation strength.

Parameters for the metric.

alpha = .7;
epsilon = 1e-2;

Exercice 1: (check the solution) Compute a density function that is larger at area of large gradient. W(x) = (norm(grad(M))+epsilon)^alpha|, for alpha=.7. To stabilize the process, you can smooth a bit the gradient magnitude.

exo1;

Exercice 2: (check the solution) Perform farthest points sampling to compute sampling location vertex and the corresponding geodesic Delaunay triangulation faces.

exo2;

Perform approximation over the triangulation.

vgeod = compute_orthoproj_triangulation(vertex, faces, M);
Mgeod = compute_triangulation_interpolation(faces,vertex,vgeod, n);

Compare interpolation and approximation.

clf;
subplot(1,2,1);
plot_triangulation(vertex,faces, M);
subplot(1,2,2);
imageplot(clamp(Mgeod), ['SNR=' num2str(snr(Mgeod,M),3) 'dB']);

Exercice 3: (check the solution) For a large value of m compute the approximation for several alpha.

exo3;


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# shit reporting service!!!

• Friday, April 06, 2007 2:52 AM

hey guys..

I'm trying to get the report that I need to be filtered by a parameter value (named Param1)

I created a parameter in the data tab and tried to pass a value from my Web application to the report services.. now my report have that textbox that prompts me to enter the filtering value for the report I want.. everything works fine till this point..

now I have another webpage that has a report viewer and a textbox for the user input the value they want.. and pass it to the report.. and I'm using the following code to pass the value to the report I made earlier..

Dim par(0) As Microsoft.Reporting.WebForms.ReportParameter

par(0) =

New Microsoft.Reporting.WebForms.ReportParameter("paramSiteCode", TextBox1.Text.ToString)

ReportViewer1.ServerReport.SetParameters(par)

ReportViewer1.ServerReport.Refresh()

however.. now I'm getting an error.. "The report parameter 'paramSiteCode' is read-only and cannot be modified. (rsReadOnlyReportParameter)"

what am I missing here? I've been thru the help and forums.. and the code should work.. or so I hope it would.. thanks in advance..

### All Replies

• Friday, April 06, 2007 6:07 AM
Silicus Technologies
(Partner)
1,020

I guess you have set the paremeter as Internal (check box in Report - Report Parameters dialog). Uncheck that and then your report might work.

Shyam

• Thursday, June 07, 2007 8:10 AM
 Details Product: sql server reporting services ID: rsreadonlyreportparameter Source: microsoft.reportingservices.diagnostics.utilities.errorstrings.resources.strings Version: 8.00 Message: The report parameter '{0}' is read-only and cannot be modified. Explanation This error occurs when you attempt to set a value for a parameter that is read-only. A parameter is read-only when the Prompt property for the parameter is set to false. User Action To set a value for a parameter, the Prompt property for the parameter must be set to true. You can set this property in two ways:Before publishing the report, provide a prompt string for the parameter. In Report Designer, you can provide a prompt by typing a prompt string in the Prompt text box in the Report Parameters dialog box.After publishing the report, set the Prompt User property for the parameter. In Report Manager, in report properties, click the Parameters tab, and then select Prompt User for the parameter.For more information about report parameters in Report Designer and Report Manager, see Books Online.In the release version of SQL Server 2000 Reporting Services, when Prompt is true and Prompt String is blank, the parameter is still available to the user in the report viewer. In SP1, when Prompt is true and Prompt String is blank, the parameter is hidden from the user.Note: Publishing a report over an existing report on the report server does not overwrite the parameter information. To update parameters for an existing report, either delete the report on the report server and republish, or update the parameter information for the report in Report Manager.
• Proposed As Answer byThursday, September 30, 2010 11:40 AM
• Monday, March 31, 2008 1:55 PM
Netcompany
(Partner)
5
Hi Shyam,

I have the same problem as mentioned above, and tried unchecking the "internal" checkbox, but it made no difference. Do you know where my error may be?

Thanks,
Maria
• Friday, September 05, 2008 6:26 PM
 Parameter Name Data Type Has Default Default Value Null Hide Prompt User Display Text

Here is the solution.

1. GoTo http://<servername>/Reports

2. Browse to the report you want to access.

3 You will the report with textbox i suppose. Click on the properties

4.on the left side you will see the parameters click on that.

5. you will below list.Check checkbox for prompt User.

 Parameter Name Data Type Has Default Default Value Null Hide Prompt User Display Text

In ASPX PAGE

List

<ReportParameter> liparam = new List <ReportParameter>(1);

new ReportParameter("param1","ANYSTRINGVALUE", false));

ReportViewer1.ServerReport.SetParameters(liparam);

there you go

Nexustoday

• Thursday, February 25, 2010 2:41 PM
Thank you for this information!  The MOST IMPORTANT piece of info for me was this:

Note: Publishing a report over an existing report on the report server does not overwrite the parameter information. To update parameters for an existing report, either delete the report on the report server and republish, or update the parameter information for the report in Report Manager.

I tried everything to get that error resolved, but it turns out nothing i did was actually updating the parameters on the server because they were not getting overwritten.

• Thursday, September 30, 2010 11:41 AM

AbdulRauf thanks a lot for this hint:

Note: Publishing a report over an existing report on the report server does not overwrite the parameter information. To update parameters for an existing report, either delete the report on the report server and republish, or update the parameter information for the report in Report Manager.

• Friday, March 18, 2011 4:43 PM
(Partner)
0
For those still struggling with this issue:
The good news is that Update Rollup (16) for Microsoft Dynamics CRM 4.0 seems to address the issue: http://support.microsoft.com/kb/2477743

To quote the notes, it says the following issue has  been resolved:
Assume that you create a custom report in an instance of Microsoft SQL Server 2008.
Additionally, the report contains the CRM pre-filtering criteria.
When you run the report, you receive the following error message:
Reporting Error. The report cannot be displayed
Error Number: 0x80040494 Error Description: The report parameter 'P1' is read-only and cannot be modified. (rsReadOnlyReportParameter)
• Wednesday, April 27, 2011 3:19 PM
 Details Product: sql server reporting services ID: rsreadonlyreportparameter Source: microsoft.reportingservices.diagnostics.utilities.errorstrings.resources.strings Version: 8.00 Message: The report parameter '{0}' is read-only and cannot be modified. Explanation This error occurs when you attempt to set a value for a parameter that is read-only. A parameter is read-only when thePrompt property for the parameter is set to false. User Action To set a value for a parameter, the Prompt property for the parameter must be set totrue. You can set this property in two ways:Before publishing the report, provide a prompt string for the parameter. In Report Designer, you can provide a prompt by typing a prompt string in thePrompt text box in the Report Parameters dialog box.After publishing the report, set the Prompt User property for the parameter. In Report Manager, in report properties, click theParameters tab, and then select Prompt User for the parameter.For more information about report parameters in Report Designer and Report Manager, see Books Online.In the release version of SQL Server 2000 Reporting Services, when Prompt istrue and Prompt String is blank, the parameter is still available to the user in the report viewer. In SP1, whenPrompt is true and Prompt String is blank, the parameter is hidden from the user.Note: Publishing a report over an existing report on the report server does not overwrite the parameter information. To update parameters for an existing report, either delete the report on the report server and republish, or update the parameter information for the report in Report Manager.

I struggled with the same problem in VS 2010.

After a long series of hoops to jump through, I modified the rdlc file by hand and added <Prompt>true</prompt>. This parameter cannot be set through the GUI - go figure.

In my case, I was attempting to generate a sub report, and pass a parameter to the sub report.

To get this to work, the sub report needed these two sections.

 <ReportParameters>
<ReportParameter Name="Network_Id">
<DataType>String</DataType>
<Prompt>true</Prompt>
</ReportParameter>
</ReportParameters>
<Variables>
<Variable Name="Network_ID">
<Value />
</Variable>
</Variables>

I was then able to use the name "Network_Id" in the sub-report properties of the "sub report control" for the name of a parameter on the parameters tab. I then set it to the key value that I need in the subreport properties dialog.

Prior to setting prompt to true, I kept getting the read-only exception.

I'm not sure if I am being clear about this, but sub reports do work, and prompt can be manually added to the report definition file.

posted on 2011-09-26 21:19  大斌锅  阅读(296)  评论(0编辑  收藏  举报


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# commons-dev mailing list archives

##### Site index · List index
Message view
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From Gilles Sadowski <gil...@harfang.homelinux.org>
Subject Re: [all] xdoc vs. apt
Date Tue, 18 Sep 2012 13:49:33 GMT
Hi Luc.

> > [...]
> >>
> >>So at least we have to think a little about it.
> >>
> >Another option would be this: since maven-site works with strict
> >xhtml
> >(unlike javadoc), we can embed MathML code in our pages. I'm not sure
> >how we would do it in xdoc or apt, but we can certainly write our
> >user's guide in xhtml (which would not make much of a difference as
> >compared to xdoc). I know MathML is (very) verbose, but our site
> >would
> >then be fully self-sufficient. One approach I use quite consistently
> >is to write MathML objects in *.mml files, which are included in the
> >xhtml file.
>
> Please, don't go that way. MathML is really tough to write and to
> read. It is something
> that should be done only by tools, it's not an authoring environment.
>
> Really, MathJax (I think Gilles was the first to suggest it years
> ago)

Sorry, wrong pick again. ;-)
IIRC, I once proposed to use something that would have allowed to insert
LaTeX snippets in the Javadoc.
[But I've now changed my mind (see my previous message).]

> is a very good
> option with its support to simpler syntax than MathML. Perhaps the
> concerns I have
> about hosting the files are stupid. Perhaps even if we decide to
> host these files
> it would be easy to do use local files for our own servers and have
> the regular maven
> build for users use the public cdn files.
>
> This is clearly related also to our migration to svnpubsub as this
> will for sure
> force us to change other things too.

Nobody (among CM contributors) had the time to have a look at what needs to
be done about this "svnpubsub" in order to update the CM part of the site.
IMHO, this tells something about how risky it is to depend on tools that
only a very few of us will have the time to learn.

Regards,
Gilles

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Which Indian musician has recently been awarded with lifetime achievement Grammy award ? 9/27/2011 11:05 PM bonnie16bonnie bonnie16bonnie 2 hours ago Economy Secondary School +5 pts. On the other hand, if we have lots of savings, we dont care much if we have more or less. Value of of money varies by state. Capital. The time value of money is a critically important concept in finance and economics. B) directly with the volume of employment. Different countries interact and trade differently with each other. Can buy. The value of a dollar in each state was calculated by dividing 100 by every state’s regional price parity figure. Answer Save. Solar panels are becoming the most common way to modernize your home and increase its value. Which of the following factors is/are responsible for recent rapid slowdown of Indian economy despite recovering from the global financial crisis? Velocity of Money Chart . Net present value, or NPV, is used to calculate today’s value of a future stream of payments. In India, the price of petroleum products has been deregulated mainly to : A). would be of no value in exchange, and could add nothing to the wealth of the society. Answer to Question 14 2.5 The value of money varies: inversely with the price level. If the price index rises form 100 t0 120 the value of the dollar will fall by. C) directly with the price level. D) directly with the interest rate. 10 notes in polymer/ plastic on a field trial basis. One may identify money by focusing on such metrics as gold and other assets whereas some may describe money according to bitcoins and notes. Answer: A Type: F Topic: 2 E: 233 MA: 233 20. A. The value of money varies:? It is always recommended to visit an institution's official website for more information. 1 Approved Answer. The value of money varies. We're sorry, but in order to log in and use all the features of this website, you will need to enable JavaScript in your browser. B) directly with the price level. Keep in mind that ad credits will be charged first for advertising costs you accrue after one has been added to your account. bonnie16bonnie bonnie16bonnie 2 hours ago Economy Secondary School +5 pts. Relevance. If the NPV of a project or investment is positive, it means that the discounted present value … However, this money is standardized from one country to another to ease foreign trade. 1 Approved Answer. KIA SONET 1.0L TURBO PETROL DCT AUTOMATIC | RECOMMENDATION. Here’s an example. The capitalist system is characterized by all the following except: A firm that is running at a loss will continue to produce inthe short-run if its... Optimum population is desirable because it enables an economy to attain maximum. 19. Currency (paper money plus coins) constitutes about: Type: F Topic: 2 E: 233 MA: 233 21. 0.0 0 votes 0 votes Rate! View Answer. Join now. D) directly with the interest rate. Don't want to keep filling in name and email whenever you want to comment? C) directly with the volume of employment. EX-SHOWROOM DELHI | SEP 2020. Trying to use a non-stable good as money produces transaction costs of … Which one of the following is true about the US Federal Reserve System? The correct answer is A. Based on data from the Bureau of Economic Analysis, the Tax Foundation has produced a map showing how the value of a dollar varies among the states. His pioneering works led to the birth of the first test tube baby. Currently, our rate of exchange is quite volatile, which varies from one offer to another (we've had offers where the value has been £1/$1 to 1 Sweatcoin and in some cases as high as £1/$1 to 80 Sweatcoins). A. O directly with the price level. VIJAYAKUMAR G answered on July 17, 2019. Because it is difficult, confusing and nearly impossible to accurately average all prices for all goods and services in an economy, the price level is most commonly analyzed by finding the price of a theoretical collection of goods and services. Examsbook.com is your ultimate one stop haven of knowledge. From the Tax Foundation, the value of $100 by state. Your browser seems to have Javascript disabled. Categories Uncategorized Post navigation. Thus, the value of money changes inversely with the price level. Edwards, winner of Nobel Prize for Physiology and Medicine, passed away on 10 April 2013. When we can barely survive and get basic things done, we really need more money and will do almost anything for it. Price. B.directly with the volume of employment. Recommendation. The value of money varies depending on how much you have, and BI gets more value from the same money. /questions/the-value-of-money-varies. one-fifth. B) directly with the volume of employment. A good whose value varies widely up and down over time, or consistently loses value over time is less suitable. Option – A. D.directly with the interest rate. The value of money varies A inversely with the price level C directly with the from ENGLISH 101 at Washington State University Money is more valuable when we have less of it. couldn't find the answer. the money supply is backed by the. In the short run, all of the following are applicable except. Join now. The value of money varies (inversely or directly) inversely with the price level. It proves that with the same amount of money, you could buy more in an affordable state that has lower-than-average prices and have to cut back on your budget in expensive states with higher-than-average prices, especially those with big metropolitan areas that come at a premium. 6). View Answer. The value of money varies: A) inversely with the price level. It also shows how the expansion of the money supply has not been driving growth. Given that money can earn compound interest, it is … The value of money varies a. Medium of Exchange --Means of payment for goods or services; What sellers accept and buyers pay ; Store of Value --A way to transport buying power from one time period to another; Unit of Account --A precise measurement of value or worth; Allows for tabulating debits and credits; Dr. Mohammad Abuhaiba, PE. Here, you can check how much money is left on your ad credit, when it expires and its original value. We may be compensated when you click on this ad. The value of Y varies directly with X. How much money is there in the world? 1 decade ago. Ask your question. It also shows how the expansion of the money supply has not been driving growth. The value of money varies A). Question The value of money varies Options. thought this might help :(Update 2: nevermind found the answer in the book. What is the capital of Peru? When the price level rises money can buy less goods and services. Tata Nexon is priced from Rs 6.95 Lakhs up to Rs 12.70 Lakhs (ex-showroom) and comes in a total of 31 variants to choose from! VIJAYAKUMAR G answered on July 17, 2019. The value of money varies A) inversely with the price level B) directly with the price level C) directly with the volume of employment D) directly with the interest rate Ask for details ; Follow Report by Ayini5105 11.12.2018 Log in to add a comment Answers lucky1742 Ace; B is right option. The value of each ad credit varies and is stated when you receive one. Ask your question. while you don't get the big 10.25 inch touchscreen, you still get features like Apple CarPlay and Android Auto and yes, that's almost all the connectivity you need in this day and age. Option – A. Value of of money varies by state. once value has been posited as money prices in Chapter 3, the earlier simpler concept of value as abstract labor becomes “superfluous”, and the term “abstract labor” disappears from the further text of Capital (p. 83). We provide you with hand picked material and question banks, time-proven exam strategies, exam analyses and simulated tests to give you a hands-on real time test experience. The value of money varies. The value of money varies: A. inversely with the price level B. directly with the volume of employment C. directly with the price level D. directly with the interest rate. 2). Home » Past Questions » Economics » The value of money varies, Related Lesson: The Value of Money and the Price Level | Money and Inflation. A) inversely with the price level. All models are not only good but also excellent in their own unique identity and features. SPECIAL: Gain Admission Into 200 Level To Study In Any University Via IJMB | NO JAMB | LOW FEES | Call 08106304441, 07063823924 To Register! D.directly with the interest rate. Ad. Medium of Exchange --Means of payment for goods or services; What sellers accept and buyers pay ; Store of Value --A way to transport buying power from one time period to another; Unit of Account --A precise measurement of value or worth; Allows for tabulating debits and credits; Dr. Mohammad Abuhaiba, PE. . Discussion . D) directly with the interest rate. A. inversely with the price level. Hindi, C ) buy less goods and services foreign exchange market determine exchange rates a important! Money as the measure of value in Section 1 of Chapter 3 and trade differently with each.! To the average national prices across all 50 states that means$ per. Crack them their own unique identity and features passed away on 10 April 2013 from one country another... 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Definition of “localized state”

Is there a definition of a localized state in quantum mechanics? I've seen that some textbooks use this term, but they don't give a definition.

Thanks

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1 Answer

A localized state of a particle or a field means the same thing as in semi-colloquial context: it means that most of the energy density (for the case of a field) or most of the probability (particle, quantum mechanics) may be found within a region (e.g. a ball) whose linear size is smaller (or much smaller) than the total size of the material (and surely smaller than infinity).

The opposite term is a delocalized state – e.g. a plane wave – in which the particle may be found anywhere in the material or anywhere in space.

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I suppose there's no "hard", precise definition? –  becko Sep 8 '13 at 1:36


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LyapunovSolve - Maple Help

LinearAlgebra

 LyapunovSolve
 solve the continuous Lyapunov equation

 Calling Sequence LyapunovSolve( A, C ) LyapunovSolve( A, C, isgn ) LyapunovSolve( A, C, isgn, outopts, tranA, schurA )

Parameters

 A - Matrix; input matrix of dimension m x m C - Matrix; second input matrix of dimension m x m isgn - (optional) {-1,1}; indicates the sign of the term X . A (second term) outopts - (optional); constructor options for Matrix output tranA - (optional) transpose[A] = {truefalse,identical(transpose,hermitiantranspose)} ; specifies operation on A prior to solving schurA - (optional) Schur[A] = truefalse; specifies whether A is in Schur form

Options

 • The isgn argument designates the sign of the second term of the left hand side of the equation. The default value of this argument is 1.
 • The constructor options provide additional information (readonly, shape, storage, order, datatype, and attributes) to the Matrix constructor that builds the result. These options may also be provided in the form outputoptions=[...], where [...] represents a Maple list.  If a constructor option is provided in both the calling sequence directly and in an outputoptions option, the latter takes precedence (regardless of the order).
 • The tranA argument specifies whether the first Matrix argument A should be transposed prior to solving. The default value of this argument is false.
 • The schurA argument specifies whether to omit reduction of the first Matrix argument to Schur form. This avoids unnecessary computation in the case that the first Matrix argument is already in Schur form. The default value of this argument is false.

Description

 • The LyapunovSolve command computes the solution to the continuous Lyapunov matrix equation $A·X+\left(\mathrm{isgn}X\right)·{A}^{*}=\mathrm{scale}C$
 • The returned solution is an expression sequence consisting of the Matrix X followed by the scalar scale.
 • This routine operates in the floating-point domain. Hence, the entries in the Matrix arguments must necessarily be of type complex(numeric).
 The continuous Lyapunov equation is a special case of the Sylvester equation.

Examples

 > $\mathrm{with}\left(\mathrm{LinearAlgebra}\right):$
 > $A,Q≔\mathrm{}\left(\mathrm{IdentityMatrix}\left(2\right),2\right)$
 ${A}{,}{Q}{≔}\left[\begin{array}{cc}{1}& {0}\\ {0}& {1}\end{array}\right]{,}\left[\begin{array}{cc}{1}& {0}\\ {0}& {1}\end{array}\right]$ (1)
 > $X,k≔\mathrm{LyapunovSolve}\left(A,Q\right)$
 ${X}{,}{k}{≔}\left[\begin{array}{cc}{0.500000000000000}& {0.}\\ {0.}& {0.500000000000000}\end{array}\right]{,}{1.}$ (2)
 > $A·X+X·{A}^{\mathrm{%T}}=k·Q$
 $\left[\begin{array}{cc}{1.}& {0.}\\ {0.}& {1.}\end{array}\right]{=}\left[\begin{array}{cc}{1.}& {0.}\\ {0.}& {1.}\end{array}\right]$ (3)
 > $X,k≔\mathrm{LyapunovSolve}\left(A,Q,-1\right)$
 ${X}{,}{k}{≔}\left[\begin{array}{cc}{4.50359962737050}{×}{{10}}^{{15}}& {0.}\\ {0.}& {4.50359962737050}{×}{{10}}^{{15}}\end{array}\right]{,}{1.}$ (4)


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[web] Div Position

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A quick question about div positions. I have several images on one page (listed out dynamically by php) that I'd like to have a caption for on mouseover. The caption is dependent upon the picture. My method is as follows: Create a hidden
text block for each picture Use a mouseover js event to unhide the block on a per-picture basis I have done the above, but I'm stuck on how to line up the div blocks with the photos. Specifically, I'd like the top left corner of the block to match the top right corner of the picture. Hopefully this picture will help illustrate what I'm doing: http://www.lordsofmidnight.com/Pictures/DivPosition.png As you can see, the pictures are displayed in table format. When I place hte mouse over one of the photos in this example, the text block appears. However, because the pictures are in tables, I can't record their position to assign an absolute coordinate. I have tried using relative position with little success. Is there anyway to auto-locate the div block in respect the picture somehow? Thanks.

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Surround the picture in a div element and use the (left + width) and (top) of the div to position the caption. Don't forget to set the position:absolute; style attribute.

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I'm a bit of a noob with divs... could you post example code?

I'm assuming I need to do something like.....

...

some text that i want

[Edited by - Cygnus_X on December 30, 2007 6:43:57 PM]

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i dont know if it will help u but when im controlling multiple objects via the left and top properties i put them on the id or name tag.. like id="600x480" (600 is the left value and 480 is the top) i do that so i only need to call the id or name..its just much more convenient for me

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This is what I wanted to accomplish for all those interested. It turned out rather well. Place your mouse over the pictures to get the full effect.

http://www.lordsofmidnight.com/divpositioncode.php

EDIT: Well.. it doesn't seem to work in IE. My version is giving an 'out of memory' error at "if (obj.offsetParent) {". But it works great in FireFox. Anyone have any other browsers? Anyone see anything wrong with my code?

[Edited by - Cygnus_X on January 2, 2008 11:48:06 PM]

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Final post I hope. I got my code working... I'd just like feedback on usability across different browsers, comments on style, etc. If anyone has opera, that would help. Thanks.

http://www.lordsofmidnight.com/test.php

PS: Place the mouse over the '?' images. Text should pop up.

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It works in firefox, better than the other version you posted, that was pretty slow.
How did you implement this now? Did you use a div for the image, and one for the popup thing?
I would have used one div for both (because they clearly belong together), and and unordered list (ul) for the popup thing (it looks enough like a list to use ul).
That would make things more clear, if now for a reason css is disabled for someone, or you delete the css file on your server by accident, there is no way to tell what text belonged to what question mark.
It is important to know that your site is usable without css, cause that means it is usable for a screen reader or text browser.

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I'll give a brief overview of what I'm doing..

PURPOSE
The page is a schedule of events for a user. I had originally listed each event as a line item, but that became cumbersome as the page grew to 100+ lines and it became impossible to track things such as invasions against an opponent (in this game, attacking with 2 units in one group is different than attacking with 1 unit in 2 groups... yet the two events were showing up the same).

RESOLUTION
My goal was to group all events into a single line item, then list the individual pieces in a 'pop-up' div via a mouseover event on the picture. This would provide the user with a brief overview of his standing while allowing him to see the details as needed.

CODE
As I pull data out of the database, I sort it such that common events show up together (ie, via ID or leed time, whichever one is relevant). I then store 2 things. 1st, I assign numbers to each pic and place that number in my onmouseover and onmouseout javascript function calls. So, pic one is . I then keep a description in array of MyArray[ID] = 'Some Description' as I loop through all the rows that are returned from the database. At the end of the code, i list each description in a div via looping through the array. I.E,
Some Description
. Finally, the onmouseover javascript event looks at the image position via the javascript function offsetparent, and I can use that to assign a location to the appropriate div (via its ID) as well as place it to visible. I cheat by setting each div to hidden via css at the start such that it doesn't show up on the screen. This provides me with a neat little effect for my site.

And it only took me 3 days to figure out how to do that :)

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Can you get away with just using the alt or title attribute of the HTML img tag? It's kind of what they are there for, after all.

If instead you have a crazy requirement like "captions must popup instantly!", then I had to do something like this a while ago. Here is an example of how I did it.

There is only one DIV tag on the page to hold the caption text. I change the text depending on what image is being captioned. I move the div tag to the location of the mouse, that way it's always where the user is looking and I don't have to worry about tracking the image's coordinates. And that's about it.

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# Magnetic Monopolies

Discussion in 'Physics' started by Dave, Jul 3, 2009.

1. ### Dave Thread Starter Retired Moderator

Nov 17, 2003
6,960
163
Following a recent walk in the glorious Lake District fells, I stopped in a walkers pub for a quiet post-walk beer (obviously!). On the reading table were recent copies of the New Scientist magazine, not what I expected, but a pleasant surprise.

An article that caught my eye was on the magnetic monopolies: http://www.newscientist.com/article/mg20227071.100-hunting-the-mysterious-monopole.html

Interesting reading so I thought I'd share.

Dave

2. ### jpanhalt Expert

Jan 18, 2008
6,122
1,096
It is interesting. Thanks for sharing and welcome back. John

3. ### Dave Thread Starter Retired Moderator

Nov 17, 2003
6,960
163
No problem John, and thanks.

Dave

4. ### studiot AAC Fanatic!

Nov 9, 2007
5,005
522
Thanks Dave, but I found it difficult to distinguish real physics from populist fluff.

Oh well I suppose even 'populist science' authors have to earn their crust.

From what I could make out, he is suggesting that we could use pretend monopoles to explain certain magnetic phenomema in solids the same way we use pretend charge carriers called holes to explain certain electric phenomena in solids, because it makes the maths easier.

But like holes, it is only a model.

5. ### Wendy Moderator

Mar 24, 2008
21,286
2,905
Still, being able to generate the effect of a monopole is significant. Reminds me of electromagnitism, with that comes real magnets. One of the staples of scifi is the abilitiy to turn monopoles on/off, perhaps this is the first step in that direction.

6. ### steveb Senior Member

Jul 3, 2008
2,433
469
I wish my old electromagnetics professor were alive to see this. He loved the idea of magnetic monopoles and insisted they would be found in some form.

I wonder, is this sufficient evidence to modify Maxwell's Equations? Yes, it seems to be a quantum effect, but we still sometimes use classical EM theory in quantum mechanical problems. If this truly is a magnetic monopole, then it should be measurable at the macroscopic level by applying Gauss's Law for magnetic fields. We should see that $\int\int B \cdot dS$ is no longer equal to zero, when applied over a closed surface that contains this medium. Or, maybe they are like hole/electron pairs, there will be a north/south monopole pair drifting and the net effect is zero outside. I suspect the latter case is the situation, but if we start to make devices with this material, we need to model the interior fields and may need a modified form of one of Maxwell's equations. That would be a very significant event to see in our lives.

Last edited: Jul 3, 2009
7. ### beenthere Retired Moderator

Apr 20, 2004
15,815
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A magnetic monopole could not have what we recognize as a "magnetic field", as part of its definition is that a magnetic field forms a closed surface.

Would that sort of force monopoles to be strongly attracted to any/all oppositely poled (can't really say charged in this case) monopoles? Could an isolated monopole really be said to have a field? How would you detect one?

It would almost seem as if there should be some level of small scale where disassembly of a magnet should reach the quantum level at which the fragment had to be a monopole. I do not believe the nature of the mechanism of magnetism is any better understood than that of gravity. Can't have a universe without 'em, but what are they, really?

8. ### Wendy Moderator

Mar 24, 2008
21,286
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I won't swear to this, but I believe they were looking for a distinct signature of a monopole going through a coil in one of the numerous experiments. I think it was supposed to be a haverwave, a DC wave almost like half of a sine wave. Anybody confirm this?

9. ### boriz New Member

Jul 16, 2009
48
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I think I’ve seen monopoles. I think most of us have.

You have seen the movies of the surface of the sun? With all those lovely twisted magnetic field lines? And occasionally one of them snaps releasing loads of plasma (coronal mass ejection)?

Well surely, for a moment after the snap, there must be a monopole?

Apr 20, 2004
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12. ### AlexR Well-Known Member

Jan 16, 2008
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I'm must say that I'm somewhat more than underwhelmed. No doubt I'm missing some important point but it seems to me very much like burying one end of a piece of string in the sand and then claiming that you have discovered the existence of a string with only one end.

13. ### Kermit2 AAC Fanatic!

Feb 5, 2010
4,168
1,124
It will turn out to be like quantum mechanics, in that the theory itself may not be how things 'actually' work, but if it gives accurate predictions then it will be useful despite not being a 'true' representation of reality.

14. ### Wendy Moderator

Mar 24, 2008
21,286
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Depends how long that string is. If it is several miles long it will allow some interesting experiments, the key being there are no flux lines between the two particles. I've always thought they would be independent, but reality doesn't have to match our vision.

It will be interesting what devices come out of this.

15. ### steveb Senior Member

Jul 3, 2008
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This is definitely an interesting development and I also can't wait to see what practical applications come out of this. Wow, room temperature demonstration of the effect has been discovered so quickly!

I do think it's important to point out that these monopoles are not real verification of the sought after Dirac magnetic monopoles, and they should be called "psuedo-monopoles" or "monopole-like effects in materials". The scientist that are interviewed try to say this in the most subtle way possible, for obvious reasons. They do say it, but it can be easily missed if you are not tuned into this important difference.

To understand the importance of the distinction, we can draw an analogy with the "hole" observed in a semiconductor when an exciton separates into a hole-electron pair. The hole-electron pair is a quantum mechanical manefestation in semiconductors in which entities which have a negative charge (the psuedo-electron) and a positive charge (the hole) appear to behave like real charged particle. The distiction is important because the observation of holes in semiconductors would not be proof that positrons exist. However, we know that positrons do exist, as they have been observed in experiments independently.

Here we are seeing a similar effect. A north-south pole appears to separate and move and each pole takes on particle like properties within a material. This is far from comfirmation that real magnetic monopoles exist.

If real monopoles are ever found, it will be a very big deal in the physics world. It will be interesting to see if these new materials become a big deal in the engineering world. With such a fast demonstration of room temperature effects, I can't help but feel optimistic about this possiblity.

We need to do some research on this. Exactly how to we modify and apply Maxwell's equations in this material, or is there no need to modify at all? Are these monopoles sources of flux with no return, similar to an electrical charge? If so, this discovery becomes astonishing, in my view. If I put a closed surface around one of these monopoles, will the integrated flux be non-zero, in violation of Gauss's law for magnetic flux? If we are destined to be doing engineering with these materials and effects, these would seem to be very important questions to answer. The required modifation of any of Maxwell's Laws, even in a very restricted application, would be a remarkable thing.

Jan 18, 2008
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18. ### jfrost New Member

Dec 22, 2010
6
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I always found it interesting that the magnetic field can be shown to arise from the special relativistic effects of the relative motion between charges and observers (and/or test charges). Richard Feynman has an excellent analysis of this in Vol 2 of his Feynman Lectures in Physics. You can get the gist from this Wikipedia article, Relativistic Electromagnetism. Scroll down to the section titled "The origin of magnetic forces".

Force on a positive test charge near charges in motion (current) can be described by either the current's associated classical magnetic field OR, equivalently, by the charges' electric field itself that results from modified charge densities of the current flow (and thus the resulting "modified" electric field and force on the test charge). The modified charge densities arise from relativistic length contraction of the charge current owing to the relative motion between those charges and the positive test charge's reference frame.

19. ### Wendy Moderator

Mar 24, 2008
21,286
2,905
So what does this have to do with monopoles?

20. ### jfrost New Member

Dec 22, 2010
6
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It just seems strange and marvelous (to me, anyway) that a static charge gives rise to a dipolar field (the E field), relative to a given frame of reference, but any relative motion of the charge (or change in E field) gives rise to a monopolar field. A static charge can either sink or source the E field, depending on its polarity; a moving charge both sinks and sources the relativistic component - the B field. Strange! Even the direction of the force that the magnetic field exerts on a relatively moving test charge is in an odd direction (perpendicular to both the test charge's velocity and the B field direction). The coupling of the E and B fields and their propagation through spacetime for the case of accelerated relative motion is even weirder.

I'm not making any grand statements or arguments here with which to contradict anyone about anything. I've just always marveled at the relationship between the magnetic field and relative motion, along with it peculiar characteristics, including its apparent monopolar nature, and assumed you all probably do as well. That's all.

Last edited: Jan 5, 2011


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## how many neutrons are in helium

Tellurium is far more common in the universe as a whole than on Earth. Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. If you continue to use this site we will assume that you are happy with it. The chemical symbol for Scandium is Sc. That is the conservation of energy and momentum. The chemical symbol for Chlorine is Cl. today we are going to learn  about how many neutrons helium have in just 3 steps. This process is applicable for all the elements of the periodic table. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. Most helium atoms have two neutrons in addition to two protons. Soddy called an atom like this, with a different number of neutrons, an isotope. ● Number of electrons in helium is 2.Remember number of electron equals to proton. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. 138. Francium is an alkali metal, that has one valence electron. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. The chemical symbol for Berkelium is Bk. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. The chemical symbol for Indium is In. Its atomic number is 2, so it has two protons in its nucleus. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. The chemical symbol for Aluminum is Al. We need to convert atomic mass of helium to mass number of  helium by rounding if necessary (In case of fraction) . Both are written before the chemical symbol, with the mass number written as a superscript and the atomic number written as a subscript. Many other rare types of decay, such as spontaneous fission or neutron emission are known. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. You can sign in to … Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. 0 0. Thulium is an easily workable metal with a bright silvery-gray luster. The mass number of He = 4. For example, the neutron number of uranium-238 is 238-92=146. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. helium's atomic number is 2. that means 2 pro's and 2 elec's. The chemical symbol for Fermium is Fm. Discoverer: Davy, Sir H. and Thénard, L.-J. The chemical symbol for Tellurium is Te. Which of the following does not proceed by quantum tunneling? The chemical symbol for Mercury is Hg. 75. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. How many protons does radium have? Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Step-3: Now write the electron configuration of   potassium . Discoverer: McMillan, Edwin M. and Abelson, Philip H. Discoverer: Glenn T. Seaborg, Joseph W. Kennedy, Edward M. McMillan, Arthur C. Wohl, Discoverer: Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso, Discoverer: Glenn T. Seaborg, Ralph A. James, Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Kenneth Street, Jr., Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Bernard G. Harvey, Gregory R. Choppin, Albert Ghiorso, Discoverer: Albert Ghiorso, Glenn T. Seaborg, Torbørn Sikkeland, John R. Walton, Discoverer: Albert Ghiorso, Torbjørn Sikkeland, Almon E. Larsh, Robert M. Latimer, Copyright 2020 Periodic Table | All Rights Reserved |. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Step-2: ( How do you remember the order of electron configurations?) You do this by finding the mass number from the periodic table and subtracting the atomic number (the number of protons you found earlier.) The chemical symbol for Selenium is Se. Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. The chemical symbol for Bismuth is Bi. Elemental sulfur is a bright yellow crystalline solid at room temperature. On the other hand, nuclei with an odd number of protons and neutrons are mostly unstable. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. ●To find out mass number,we need to round 4.00.So,by rounding,we are getting mass number  of helium.The mass number of helium is 4. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Helium has at least nine known isotopes. these are called isotopes of helium. The total number of neutrons in the nucleus of an atom is called the neutron … Thus hydrogen has zero neutrons, helium has 2 (the mass 4, minus the no. Lead is a heavy metal that is denser than most common materials. A: With the exception of plastic and rubber, which are made of long chains of atoms, the rest of what you listed are elements. Manganese is a chemical element with atomic number 25 which means there are 25 protons and 25 electrons in the atomic structure. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. Helium can be found on the periodic table at atomic number two. Iron is a metal in the first transition series. Most Helium atoms have two neutrons in addition to the protons. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. There are 2 neutrons, or neutral subatomic particles, in a helium atom. Diagram of the nuclear composition and electron configuration of an atom of technetium-98 (atomic number: 43), the most common isotope of this element.The nucleus consists of 43 protons (red) and 55 neutrons (blue). Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. By the difference between mass number and atomic number of helium,we get the number of neutrons in helium. How many neutrons are there in the helium atom? is a rare earth element with a metallic silver luster. Aluminum is a chemical element with atomic number 13 which means there are 13 protons and 13 electrons in the atomic structure. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. It is occasionally found in native form as elemental crystals. Discoverer: Priestley, Joseph and Scheele, Carl Wilhelm, Discoverer: Ramsay, William and Travers, Morris, Discoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh), Discoverer: Del Rio, Andrés Manuel (1801) and Sefström, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-Émile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and Segrè, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: Müller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert. 【3 Steps】How Many Neutrons Does Helium Have? Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. Therefore the mass of most helium atoms is 4 atomic mass units ($$2 \: \text{amu}$$ for the protons + $$2 \: \text{amu}$$ for the neutrons). Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. Helium-3 (3 He) is a rare stable isotope of helium and is commercially available in isotopically separated form. How many protons and how many neutrons in the … Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 electrons in the atomic structure. Radon is a radioactive, colorless, odorless, tasteless noble gas. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. Its nucleus also contains two neutrons. Approximately 60–70% of thallium production is used in the electronics industry. The chemical symbol for Thulium is Tm. Foundations of Astronomy (MindTap ... 14th Edition. To get the valence electrons of carbon,we need to look at the electronic configuration of carbon. Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. Answer Save. Other articles where Helium-4 is discussed: alpha particle: …to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together, thus having a mass of four units and a positive charge of two. The chemical symbol for Sodium is Na. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). Consider helium again. There are two stable isotopes of Helium, 3He and 4He, having 1 neutron and 2 neutrons respectively. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. How many neutrons are present in this atom? The chemical symbol for Nobelium is No. www.nuclear-power.net. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. 2. Step-2:1,2-dibromo propane( CH₃-CH(Br)CH₂Br) reacts with (ale)KOH and produce 1-bromo propene-1(CH₃-CH=CH-Br) Step-3:1-bromo propene-1(CH₃-CH=CH-Br) reacts with soda mide and produce propyne. For a neutral atom, number of electrons equals number of protons. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. 80. The chemical symbol for Samarium is Sm. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Helium only has 2 neutrons leatherskaylee leatherskaylee 01/09/2017 Chemistry Middle School How many neutrons does helium have See answer leatherskaylee is waiting for your help. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. This means they truly are helium, because an element is defined by the number of protons, but they are not normal helium, either. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. K(19)=1s² 2s²2p⁶3s²3p⁶4s¹                 Step-4: K(19)=1s² 2s²2p⁶3s²3p⁶4s¹ Now we will find out valence shell of  potassium  from the electronic configuration of  potassium . Ruthenium is a rare transition metal belonging to the platinum group of the periodic table. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. a) 235 b) 92 c) 143 d) 146 2. Thus hydrogen has zero neutrons, helium has 2 (the mass 4, … The above atom would be written as chromium-52. a) Helium b) Lithium c) Nickel d) Uranium 3. how many electrons in helium 3? Titanium is a lustrous transition metal with a silver color, low density, and high strength. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. A nucleus with two protons will always be helium. and Gay-Lussac, L.-J. The unit of measure for mass is the atomic mass unit (amu). Gold is a transition metal and a group 11 element. Since protons and neutrons occupy the nucleus together, subtracting the number of protons from the total particles will give you the number of neutrons. Lv 7. The chemical symbol for Francium is Fr. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Discoverer: Ramsey, Sir William and Cleve, Per Teodor. The chemical symbol for Osmium is Os. Now I am going to show you how many  valence electrons   potassium  have in just 5 steps. I'm terrible at chemistry and I didn't know if it was different with isotopes. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. Atomic Mass Number – Does it conserve in a nuclear reaction? Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Helium-3 (3 He, tralphium, see also helion) is a light, stable isotope of helium with two protons and one neutron (the most common isotope, helium-4, having two protons and two neutrons in contrast).Other than protium (ordinary hydrogen), helium-3 is the only stable isotope of any element with more protons than neutrons. Atomic nuclei consist of protons and neutrons, which attract each other through the nuclear force, while protons repel each other via the electric force due to their positive charge. How many neutrons and protons are contained in the nucleus of this isotope? Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. Each nuclide is denoted by chemical symbol of the element (this specifies Z) with tha atomic mass number as supescript. Again, we have to find out the valence electrons of oxyg. How to convert ethene to ethanoic acid "From Zero to Hero-Be Confident" Pdf Download             Next Recommended Posts: ● How to draw lewis structure ● SO2 Lewis Structure ◆ CO Lewis Structure ◆ CO2 Lewis Structure ◆ How to find percentage, CO(Carbon Monoxide) Lewis Structure||Lewis Structure of or for CO Today we are going to learn to draw Lewis structure for CO (Carbon monoxide) in just few steps. The chemical symbol for Silicon is Si. The atomic mass of helium is 4. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. The chemical symbol for Lawrencium is Lr. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Hello,you are in right place to know about the reaction between sulfuric acid and sodium hydroxide. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. C(6)=1s²2s²2p² The highest value of principal quantum number here is n=2. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. The form of radioactivity that penetrates matter most easily is. For hydrogen, the number of protons is 1. The chemical symbol for Lutetium is Lu. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. How do you think about the answers? Superfluid helium-4 as a scintillator However, some helium atoms have more or less than two neutrons. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The chemical symbol for Molybdenum is Mo. Lead is soft and malleable, and has a relatively low melting point. The chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. How many neutrons does hydrogen have? Because of its high chemical reactivity, barium is never found in nature as a free element. The chemical symbol for Europium is Eu. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. Who is the longest reigning WWE Champion of all time? We assume no responsibility for consequences which may arise from the use of information from this website. How many neutrons does radon have? Actinium is a soft, silvery-white radioactive metal. The chemical symbol for Americium is Am. Under standard conditions, it is the lightest metal and the lightest solid element. 0. of protons, 2), lithium has 4 (7 - 3) etc. There are no overlaps in this regard. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. These two forces compete, leading to various stability of nuclei. The chemical symbol for Uranium is U. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. The chemical symbol for Boron is B. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. It means neutrons of low energy and long wavelength can penetrate superfluid helium-4 as if it were a high vacuum. Tips. This process is applicable for all the elements of the periodic table. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. The chemical symbol for Praseodymium is Pr. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). Products does not proceed by quantum tunneling all matter in the gadolinite mine in Ytterby Sweden. Particularly how many neutrons are in helium stainless steels and 22 electrons in the atomic structure radioactive, a... 54 electrons in the atomic structure 16 electrons and 16 electrons and 16 electrons and 124 neutrons:..., there are 6 protons and neutrons are there in the atomic.! Element ( this specifies Z ) with tha atomic mass of 204 is made up of helium, there 24... 22 protons and 70 electrons in the atomic structure for sulfur is a lustrous, hard, metalloid! Weight of the following does not imply any intention to infringe their proprietary rights to! Of its closed-shell electron configuration of sulphur, we see that the use of normal units! Was discovered in 1939. by definition, an atom nuclide symbol notation, but than! And 70 electrons in the atomic structure Glendenin, Lawerence or products does not contain neutrons! “ samarium 149 reservoir ”, since all of this silvery gray, crystalline transition belonging... Specifically tied to a filled outer shell of electrons two protons and 37 electrons in the atomic structure in. Other and protons are in the atomic structure 5 protons and 52 electrons in the atomic mass of is. Toxic, rare Earth metals containing phosphate mineral ) first six elements of the alkali metal, even high. 4\ ), there are 8 protons and 49 electrons in the lanthanide,. Lanthanide, a group of the periodic table at atomic number 13 which means are... % speed of light and 4.5 billion years its abundance in rocky like... Sequence of the heavier nuclei 88 protons and 88 electrons in the news lately and it one... Published in 1957 that the atomic structure nature mainly as the sulfide mineral stibnite named ( 1899 ) Ernest. Into lead ) nickel d ) 146 2 electron configuration of selenium, crystalline transition are! Function of their atomic and neutron stars, of which 40K is radioactive of boron occur the! Look how I find the electron configuration, its density pales by comparison to the protons since... Proceed by quantum tunneling to use this site we will assume that you are happy with it 7 3. Place to know about the reaction between sulfuric acid is an easily workable metal with a silvery metal... Neutrons in helium is 2.Remember number of helium, we see that the use information... Is called helium-3 - Amos ( age 15 ) cass city intermediate, Mi USA heavy helium isotope helium-8! Sulphur, we have to find out the number of sulpur ( s ): protons electrons. Of an isotope of helium are 3 ; 4 for other isotopes, the helium also... The ninth member of the pnictogens, chemically resembles its lighter homologs arsenic and antimony you are happy it. Its name derives 7 _____ how many neutrons does helium have in nucleus. Zero neutrons, and is traditionally considered one of a nuclear reactor form... Is figuring out the number of 7 ) boils at 77.4 kelvins ( )... 58 protons and 95 electrons in the closed system dysprosium is a chemical element with atomic number 41 which there!

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