Science topic

# Computing in Mathematics, Natural Science, Engineering and Medicine - Science topic

Explore the latest questions and answers in Computing in Mathematics, Natural Science, Engineering and Medicine, and find Computing in Mathematics, Natural Science, Engineering and Medicine experts.

Questions related to Computing in Mathematics, Natural Science, Engineering and Medicine

I shared the picture of three parameters 1.Change in Temperature, 2. Change in Relative Humidity, 3. Change in Pressure and respective error value for that.

From the attached data(picture and excel file attached), I need to find the Error value for different input parameter.

If

1.Change in Temperature = 1°C

2. Change in Relative Humidity = 1%

3. Change in Pressure = 1mbar

What is the error value?

If

1.Change in Temperature = 2°C

2. Change in Relative Humidity = 2%

3. Change in Pressure = 2mbar

What is the error value?

If

1.Change in Temperature = 4°C

2. Change in Relative Humidity = 3%

3. Change in Pressure = 2mbar

What is the error value?

**Is it possible to find the error value by mathematics. Please tell the way to calculate using calculator or python programming.**

- Could you please point me out to some Computer science, and Computer Engineering applications modeled, described, or analyzed using partial differential equations?

- Preferably, involving heat, reaction-diffusion, Poisson, or Wave equation.

- If possible in fuzzy environment.

Best regards

Sarmad.

I have a function as follows:

y= a*x^b

a=7e-5

b=-0.755

I attached a simple graph of the function. As it is apparent from the graph the CURVATURE of the function increases from ZERO to a finite value (around x=0.1-0.2) and then it decreases to reach a value of ZERO. I did my best to draw the CURVATURE of this function using the following formula:

K=f"/(1+f'^2)^1.5

However, using this formula I could not reach the predictable trend of the curvature. Do you have any idea what is the problem?

I can work with MATLAB and Excel.

Your help is appreciated in advance.

Kind regards,

Ebrahim

Given the presented scatter-plot, it is looking like that there is a relationship between X and Y in my data. Unfortunately, the simple nonlinear curves can not describe this relationship. However, I guessed some equations like Y= aX^b + c and Y= a*exp(b*lnX) that can describe the relationship but it seems that they are not the perfect ones.

I am able to do the analysis in MATLAB, SPSS and Excel if you have any suggestion to solve the problem.

kind regards,

Ebrahim

Dear all,

I'd be grateful if you provide me the solution of this ratio of double integration. I think, the solution will be approximately by using

*Lindley*approximation. Thanks in advanceRegards,

Huda

Do you think that the iThenticate/CrossCheck/Similarity Index would cause heavy and serious confusion in mathematics? Even destroy, ruin, damage Mathematics? Our mathematics and mathematicians should follow and inherite symbols, phrases, terminology, notions, notations in previous papers, but now we have to change these to avoid, to escape, to hide, to decrease the iThenticate/CrossCheck/Similarity Index! It’s very ridiculous for mathematics and mathematicians! Mathematics is disappearing! being damaged!

First a large size matrix requires sufficient memory to inverse the matrix. Secondly, there are several mathematical techniques are available to solve the inverse of a matrix. But in handling a large matrix, still I couldn't find any faster and accurate method which can solve this problem with less memory consumption as well.

Global search vs local search.

I'm trying to go through the data for JRA-55 but I can't even get into it. If possible, please name some packages for this job.

Could you please point me out to some successful nanotechnology real life applications modeled by using partial differential equation? Preferably, involving heat, reaction-diffusion, Poisson, or Wave equation. If possible in fuzzy environment.

Best regards

Sarmad.

- Could anyone please help me to some Biochemistry, Genetics and Molecular Biology modeled, described, or analyzed using partial differential equations? "the model is very appriciated"

- Preferably, involving heat, reaction-diffusion, Poisson, or Wave equation, an If possible in fuzzy environment.

Best regards

Sarmad.

- Could you please point me out to some successful Medical sciences applications using partial differential equations?

- Preferably, involving heat, reaction-diffusion, Poisson, or Wave equation.

- If possible in fuzzy environment.

Best regards

Sarmad.

What is the fastest way to learn about neural networks? there types? how to use them? full solved examples? real life applications?

Many thanks

Could you please point me out to some successful Signal, image, or video processing real life applications using partial differential equation?

Preferably, involving heat, reaction-diffusion, Poisson, or Wave equation.

If possible in fuzzy environment.

Best regards

Sarmad.

Could you please point me to real life applications with complete model and description to its details? and if possible in fuzzy environment.

Best regards and many thanks.

Dear All,

Can I transform a linear fractional Volterra integro-differential equation into a fractional differential equation? If yes, then how?

**The equations are written in the attached file.**

Thank you very much in advance for your help.

Sarah

Dear all,

I have developed a new technique which solves

**linear**integro-differential equations of fractional type. This includes Fredholm and Volterra equations.I am looking for an application which can be modeled into such equation so I can apply my method. It can be any kind of application.

I also solve mixed system of equations e.g.1. A system of multiple Fredholm equations of different order of fractional derivatives (0, 1/2, 1, 3/2, etc..) or e.g. 2. A system of same or different kinds of Volterra equations. So, if there is an application to this kind of equation, it would be great!

I would appreciate your help. Please refer me to an article.

P.S.

**Only linear equations please.**Thank you very much in advance.

Sarah

I need to find the column reduction form of a matrix. Are there any easy methods, free online books or pdfs where I can get examples?

I'm looking for an equation:

prob(death) = ...

I would like to know a good reference (text book and/or library c) of how to adjust/align 2D images.

I am using Dynamic Time Warping to align 2D images along one axis, but I would like to make a multi-dimensional adjustment. I also need the shift matrix associate to this alignment.

Dear all,

I am working in the prostate edema modeling where i want to simulate the interaction of swelling prostate with the neighbor organs using finite element analysis. In my development i use the FeBio software.

I set contacts between the prostate and the neighbor organs (bladder and rectum). Initialy they are separate and while the prostate swells interaction between the organs occur. My problem is that if i constrain the bladder and rectum the prostate penetrates and if I let some degrees of freedom the prostate pushes away the two other organs.

The desired response would be the prostate pushing the two other organs in some degree while all the three organs undergo shape deformation due to the contact pressure between them. For a reason I can't figure out why I can't produce this response. Has anyone an idea why this is happening?

ps. I consider uncompressible materials for the prostate and rectum and poroelastic material for the prostate.

Thank you in advance,

Konstantinos.

Dear All,

I am facing trouble handling convective flux in a scalar transport equation for two-phase flow along wall boundary. Some wall boundary cells have low density and viscosity while the rest of the cells have high density and viscosity.

Due to this boundary condition I am getting non-physical unbounded scalar values.

Kindly either suggest some way to handle this or please share some link to literature regarding it.

I am seeking some expert advice.

Thanks a lot in advance.

I am trying to fit this kind of data plot. So far I came with a mix of 2 stretched exponential and one linear (Fitting1.jpg). But it's not that, as it cannot take the long convex curvature at the right of the plot (Fitting2.jpg). Also when I take the same set of function, it does not match other curves from the same experimental setup. This curve represents the current in function of time after starting the illumination of a solar cell. I am expecting super dispersive transport dictated by a complex netword of traps. Please let me know if you already saw such shape. Thank you.

I have a problem with this - the image has more cells so that makes a problem when I enhance or segment.

We know that the monic Chebyshev polynomial of degree n, T_n(x), has the least deviation from the origin among all polynomials of degree n. What about the polynomial of degree n that has the least deviation from the origin that also satisfies boundary conditions, continuity at both end points, for example?

The problem can be explained for a particular case as follows:

Suppose that we are interested in approximating a polynomial f of degree >n on [-1,1] by a polynomial p of degree n so that they meet at the endpoints.

Minimize Maximum |f(x)-p(x)| on [-1,1].

I'm working in genetic fields and I need to improve some algorithm based on the Dirichlet process. Recommendation for books or articles are awaiting - will be cited if useful.

Hi,

I've just started screening experiments to determine the molecular binding mode of four proteins, and unfortunatelly I still have problems determining which sidechains are in contact with the ligand, especially the hydrophobic interactions. Is there any rule of thumb on how to determine it? Of course I can use the software provided option, but reluctantly it's not enough to catch all interactions.

Thanks,

Tomek

1/a is the height of the capillary fringe above the water table, and d is the depth to the water table. Both of them decrease during rainfall period.

I am developping a library of mesh mover for FSI, but I got some problem to keep valid mesh for movement of high lift components of aircraft (from takeoff to cruise). I use an interpolation function (IDW) to move the mesh but when two bodies are close of each other the mesh in between get distorted to generate negative elements.

NCBI Genbank hosts enormous numbers of COI sequences. However, it is not explicit how many species have their COI being sequenced, since there is also so many multiple sequences from one single species. I followed the keywords provided by Kwong et al (2012) to pull out the metazoan COI sequences (link provided below), with which I can obtain ~900,000 sequences, but cannot get the number of species information.

I want to do a comprehensive study on the hydrological regime of the Danube in the Small Wetlands of Braila and its role in the dynamics of ecosystems. Could you recommend me ways of computing and / or software for the hydrological's cyclicity and seasonality?

A FORTRAN 77 based OpenMPI code, I need to execute. After certain iterations I am getting the error (please check the attachment). I am accessing the server from my machine with SSH Secure Shell Client. After checking every possible cause of failure (SSH connection problem, memory allotted for my work on server, OpenMPI packages, input data for code etc.) in running the program, I come to a conclusion (at my end) that the problem is related MPI looping. I don't have much experience with MPI mechanism and seek a help for this. Any possible related solutions will be a great help for me and heartily respected.

By grey system theory I mean the one defined by Deng Julong in 1982. 'As far as

information is concerned, the systems which lack information, such as structure message, operation mechanism and behaviour document, are referred to as Grey Systems.', Deong Julong.

A lot of research in grey system theory has been done since 1982. There are books and articles, but performing all the calculations manually is not effective, especially when some changes have to be introduced repeatedly.

I work with electrophysiology on neuronal cells. I apply to each cell a series of currents, in 20 pA steps, ranging from 0 to 200 pA. At each step the cell produces a number of action potential (AP). I’d like to see if the application of certain drugs (treatments) changes the excitability (number of APs for each current) of the cells. One option would be to use multi-level models, but I'm not totally sure how to do this.

A good explanation of the problem, and with my attempts to solve it, is available in the link.

Is there any way we could compare these curves, between control and different treatments?

Here is the problem:

There are 100 doors and 100 people. The doors have two states (open/closed). All the doors are closed at first. Then the first person opens all the doors, the second person toggles the doors in multiples of 2 (e.g. door 2,4,6..). The third person toggles the doors in multiples of 3 (3,6,9...). This continues until person 100 toggles the door 100. So how many doors are open and how many are closed. Please give an equation for any number of doors as well. Thank you.

Let's say you have string (e.g. guitar), which is fixed on both ends; and you want to place a discrete number of actuators to damp natural frequencies of it.

How can I find the best position to damp for example the first five modes?

Or the other way around: There is an actuator on a fixed position and you want to know the damping characteristic on an specific mode?

Solve for B, t1, t2

A1 =B.e^pt1

A2=B.e^pt2 .

t2 - t1 = c ; known constant.

p also another known constant.

Any method is acceptable.

"Cloud models are effective tools for uncertain transition between a linguistic term of a qualitative concept and its quantitative description. In short, it is a model of the uncertain transition between qualitatives and quantitatives."

I am still looking for simulation models or submodels that combine plant/vegetation growth with herbivore grazing on these plants. I aim at using it for an MSc course on the use of models in ecology.

when I clicked the run button, the system shows

The matrix is not strictly diagonally dominant at row 1

The matrix is not strictly diagonally dominant at row 2

The matrix is not strictly diagonally dominant at row 3

The matrix is not strictly diagonally dominant at row 4

What dose this mean?? what's the matter with my input??

clear;clc

format compact

%% Read or Input any square Matrix

A = [-8.7673 9.4736 0 0 0;

4.7368 -8.4736 4.7368 0 0;

0 4.7368 -8.4736 4.7368 0;

0 0 4.7368 -8.4736 4.7368;

0 0 0 -9.4736 10.4736];% coefficients matrix

C = [20;20;20;20;20];% constants vector

n = length(C);

X = zeros(n,1);

Error_eval = ones(n,1);

%% Check if the matrix A is diagonally dominant

for i = 1:n

j = 1:n;

j(i) = [];

B = abs(A(i,j));

Check(i) = abs(A(i,i)) - sum(B); % Is the diagonal value greater than the remaining row values combined?

if Check(i) < 0

fprintf('The matrix is not strictly diagonally dominant at row %2i\n\n',i)

end

end

%% Start the Iterative method

iteration = 0;

while max(Error_eval) > 0.001

iteration = iteration + 1;

Z = X; % save current values to calculate error later

for i = 1:n

j = 1:n; % define an array of the coefficients' elements

j(i) = []; % eliminate the unknow's coefficient from the remaining coefficients

Xtemp = X; % copy the unknows to a new variable

Xtemp(i) = []; % eliminate the unknown under question from the set of values

X(i) = (C(i) - sum(A(i,j) * Xtemp)) / A(i,i);

end

Xsolution(:,iteration) = X;

Error_eval = sqrt((X - Z).^2);

end

%% Display Results

GaussSeidelTable = [1:iteration;Xsolution]'

MaTrIx = [A X C]

So, to emphasize what I mean, consider the following example: You want to enter a chemical sum formula (or an whole equation) into a text, spreadsheet, whatever. Of course, you can abuse some of the already existing tools such as superscript/subscript in a word processor or math mode to get the symbols and format you need.

But, one could think of a more natural way to enter such information and I am sure there are already approaches to do so. Also approaches for data file formats to save this information, ...

Now, are there journals dealing with developing of such methods and approaches?

Simple robots, including LEGO based ones, are an engaging and physical tool for students can investigate and develop problem-solving skills in a fairly unthreatening ways. The question then comes to mind though where-else, if any where, could they be used for supporting teaching? Control is one but what about networking concepts?

I need a function f(x) such that when f(x) is applied to any function's sub-functions, the result is the same as if f(x) is applied over the entire function. For example: f((a^2)b + ln(c)/d - 2^e) = f( f( f( a^2 )b ) + f( f( f( ln(c) )/d ) - f( 2^e ) ) ). Another requirement is that f(x) cannot be linear. Does such a function exist?

EDIT: I've come up with another acceptable scenario: f((a^2)b + ln(c)/d - 2^e) = g( h( i(a^2)b ) + j( k( l( ln(c) )/d ) - m( 2^e ) ) ), where g(x) is always applied to addition operations, h(x) to multiplication, i(x) to powers, j(x) to subtraction, k(x) to division, and l(x) to logarithms, and m(x) to exponentiation, etc.. With this scenario, f(x) can be linear, but the g(x), h(x), etc. cannot be linear.

Three light emitters are placed in a room and one detector in each corner (-1;1), (-1;-1), (1;-1) and (1,1). Also the positions of emitters are given. This system should be represented by a matrix. Source values should be found by LSQR. After that, SVD incl. gaussian 0.1 standard deviation noise has to be performed. Finally, Tikhonov regularization and the L-curve are needed. Anyone know how these two work mathematically and what their results represent?

In autonomic computing, system is able to research itself and update its needs according to research findings.

I am desiring a system that is deciding on the basis of previous decisions, either from human decisions or system decisions.

For any further discussion please do not hesitate to send messages.