Engineering, Applied and Computational Mathematics

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Question:
Open How to reduce background noise in software?
Adobe Audition has this function: choose a section a the sound file that only contains noise, and it will reduce all the similar noise in other sectio... [more]

Adobe Audition has this function: choose a section a the sound file that only contains noise, and it will reduce all the similar noise in other sections. I want to know the Algorithm.

By Hawbun Jill · South China University of Technology

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10 Is there any good reference to study the Lagrangian equation for conservative and non conservative systems and its applications on modeling?
By Gagan Meena · Indian Institute of Technology Delhi

Naoufel Azouz · Université d'Évry-Val-d'Essonne

A. Shabana "Multibody system dynamics". A good reference for research in mechanical fields.

A. Shabana "Multibody system dynamics". A good reference for research in mechanical fields.

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13 Looking for interesting examples of non-linear matrix equations of the type X'=F(t,X), t \in R and X, F are matrices of the same order
By Atiya Zaidi · University of New South Wales

Mohammad Ghalambaz · Shahid Chamran University of Ahvaz

Dear Atiya, i have uploaded three of my recent papers in my profile. The governing ODEs can be written in the proposed form. Please check them.

Dear Atiya, i have uploaded three of my recent papers in my profile. The governing ODEs can be written in the proposed form. Please check them.

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5 What is process systems engineering?
By Asfaw Gezae · Universitat Rovira i Virgili

Leopoldo Rios · National Council of Scientific and Technical Research

I think the engineering processes (computer) systems require a simple vision for solutions to complex situations. In most cases, it is carrying out a ... [more]

I think the engineering processes (computer) systems require a simple vision for solutions to complex situations. In most cases, it is carrying out a solution based on a layered model, each player trying to describe how it should do its work, in order to integrate in this way to the desired solution. To achieve the goals you should invest time in listening to the players and their needs, the more precise and objectives are, the better the description to go to the members of the process. I think some of this is the query .. haha.

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7 What will happen to contemporary mathematics if it turns out that Zorn's lemma is incorrect?
By Ismat Beg · Lahore School of Economics

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4 Why is there no body force considered in the equilibrium equations of the RVE in the homogenization technique?
By Ahmad Akbari R. · Cardiff University

Ahmad Akbari R. · Cardiff University

Wow! after almost 7 months finally I understood your great answer. Many thanks again.

Wow! after almost 7 months finally I understood your great answer. Many thanks again.

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3 Can we reduce the stress concentration in a spur gear tooth by providing hole or any other geometrical shape on gear tooth. ?
By Sumit Sharma

Rahul Singh Kotesa · Birla Institute of Technology and Science Pilani

It is too early to suggest a title to your work......It depends on the results and success of the work....The temporary title can be "Reduction of str... [more]

It is too early to suggest a title to your work......It depends on the results and success of the work....The temporary title can be "Reduction of stress concentration in gear tooth"..... First a literature survey of the problem is required - whether somebody has attempted it or not. If not ,I would strongly recommend a theoretical and mathematical check for the problem before jumping to any simulation software like Ansys or Abaqus. Study some books on Design of machine elements to strengthen your basics and then search for journal articles to assess the improvements in this field. U can then switch to the simulation softwares to verify your results or suggest some improvements to it.

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36 Could anybody tell me some models or applications in which Sparse Matrix Matrix Products are required?
By G. Ortega · Universidad de Almería

Simon Clift

Sparse matrix algorithms in general are crucial. I don't care how large your computer is, sparse matrix-vector multiply is O(N). Dense is O(N^2). N... [more]

Sparse matrix algorithms in general are crucial. I don't care how large your computer is, sparse matrix-vector multiply is O(N). Dense is O(N^2). N~10^6 is a modest sized problem. Eventually any exponentially growing operation like that will kill your performance. Parallel matrix-vector multiply is trivial. Solution of a single linear system in parallel tends to be inefficient, yes, but it is rare that you have only a single problem to solve. If I have 200 financial instruments to value, or 200 similar fluids problems to solve, I can use 200 CPU's trivially in parallel. :) That said, some gain is possible for single elliptic or parabolic problems by using Krylov subspace methods with a Schur-decomposition based preconditioner, but the latter tends to have to be tuned to the problem.

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14 There are rooms to develop new elements in FEM, but whats the need and advantage ??
By Sukesh Nerolu · Vellore Institute of Technology

Danesh Nourzadeh · Carleton University

Well, in the case of developing new elements in FEM, it is somehow a need-based matter. For example I did a research on separation and slippage of con... [more]

Well, in the case of developing new elements in FEM, it is somehow a need-based matter. For example I did a research on separation and slippage of concrete and steel rebars where I needed to develop a new 4-node element for the contact, and I just did it. It is completely need-based, but in other hand, there is still room for some state-of-the art and novel elements to be generated.

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2 Formula for viscosity in bioconvection.
By Song Chen · Auburn University

Song Chen · Auburn University

I have found the formulas by Eeinstain, Brady, Mooney, Batchelor and others. Most of them are nonlinear relationships. For low concentration viscosity... [more]

I have found the formulas by Eeinstain, Brady, Mooney, Batchelor and others. Most of them are nonlinear relationships. For low concentration viscosity is a linear or quadratic function of concentration. For higher concentration >10%, the viscosity increase exponentially

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1 What are the equations which can be used to design microvalves?
By Lokesh Agarwal · Vellore Institute of Technology

Ram M S · SASTRA University

Check out the article regarding electro osmotic flows. You will get some idea!!

Check out the article regarding electro osmotic flows. You will get some idea!!

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Question:
Open Does anyone know some of the latest application of the neural optimization?
Neural optimization for the pattern recognition

Neural optimization for the pattern recognition

By Naveen Sharma

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5 "Smallest non-zero determinant"
By Dennis Alazigha · University of Wollongong

Dennis Alazigha · University of Wollongong

Thank you all. I came across "smallest non-sero determinant in "Fluid Mechanics" textbook titled: Introduction to Fluid Mechanics, by Fox and Mcdonald... [more]

Thank you all. I came across "smallest non-sero determinant in "Fluid Mechanics" textbook titled: Introduction to Fluid Mechanics, by Fox and Mcdonald, (2011, pp. 302), Sorry, in fact it is "highest non-zero determinant".

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2 Multiple cross-correlation function?
By Victor Manuel Velasco Herrera · National Autonomous University of Mexico

Evaldas Vaiciukynas · Kaunas University of Technology

Thank you, Beto CL, this 'Multiple Channels' section was interesting. Those functions 'xcorr' and 'xcov' functions of Signal Processing Toolbox seem i... [more]

Thank you, Beto CL, this 'Multiple Channels' section was interesting. Those functions 'xcorr' and 'xcov' functions of Signal Processing Toolbox seem indeed useful when dealing with time signals, since they consider autocorrelations at all possible (or maxlags) besides usual (lag 0) cross-correlations. Wikipedia mentions the combination of inter-correlation matrix (containing correlations between all possible pairs of predictor variables) with cross-correlation vector (containing correlations between each predictor variable and the target variable) as 'the coefficient of multiple determination': http://en.wikipedia.org/wiki/Multiple_correlation But you need to choose target variable. If you choose each variable in turn as a target, then you'll end up with many determination coefficients (R^2). These, by applying very simple formula [ 1 / (1 - R^2) ], can be transformed into VIFs (variance inflation factors), or tolerances (1/VIF). They are widely used for multicollinearity detection. Also 'path analysis' may be interesting if you have short time series: http://www.stattools.net/MReg_Exp.php#Path%20analysis Recently I came across a very powerful generalization of correlation for various types of data - Krippendorff's alpha: http://en.wikipedia.org/wiki/Krippendorff's_alpha Since it's not intended for continuous data, you'd need to discretize your signals (at least to some degree of quantization). Also, as far as I understood, this alpha does not consider autocorrelations, but it handles missing values and allows you to analyse not only metric data (of interval scale), but also non-metric (binary, nominal, ordinal, interval, ratio, polar, and circular levels of measurement).

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1 How can I find the centroid of a voronoi cell?
By Serkan Yıldız · Isik University

Monique Teillaud · Institut National de Recherche en Informatique et en Automatique

The CGAL library (www.cgal.org) has - Delaunay triangulation packages, with dual functions - a function centroid, in the package on Principal compone... [more]

The CGAL library (www.cgal.org) has - Delaunay triangulation packages, with dual functions - a function centroid, in the package on Principal component analysis.

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1 What is a suitable method to extract non-stationary sinusoidal interharmonics individually from a group of interharmonics?
By Divya Thangamani · Fachhochschule Flensburg

Antonio Lucero ·

You might consider applying a series of Fast Fourier Transforms using overlapping time windows. Then you can study how the frequencies change with tim... [more]

You might consider applying a series of Fast Fourier Transforms using overlapping time windows. Then you can study how the frequencies change with time.

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Question:
Open Recomendations for literature on deterioration models for road tunnels?
I would appreciate for reference articles, books, etc, on this subject.

I would appreciate for reference articles, books, etc, on this subject.

By Hugo Perneta · University of California, Santa Barbara

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2 Can anyone recommend an online book about "machine learning"?
By Camilo Moreno · National University of Colombia

Evaldas Vaiciukynas · Kaunas University of Technology

I love PASCAL lecture series : http://videolectures.net/pascal/

I love PASCAL lecture series : http://videolectures.net/pascal/

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3 2d characteristic method
By zb Khorrami · Tehran University of Medical Sciences

Roberto Mecca · Technion - Israel Institute of Technology

Look at the semi-lagrangian schemes or the up-wind implicit scheme. They work quite well for the general framework you are talking about.

Look at the semi-lagrangian schemes or the up-wind implicit scheme. They work quite well for the general framework you are talking about.

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1 Algorithm for Hilbert spectrum in discrete case
By Viktor Dmitriev · State Scientific Center of the Russian Federation the Arctic and Antarctic Research Institute

Manuel Ortigueira · Universidade NOVA de Lisboa

In Matlab, the function z=hilbert(x), computes the analytical signal. To have the hilbert transform, you pick the imaginary part.

In Matlab, the function z=hilbert(x), computes the analytical signal. To have the hilbert transform, you pick the imaginary part.

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1 Advice sought for the computation of permanents of general complex matrices
By Axel Lode · Universität Heidelberg

Axel Lode · Universität Heidelberg

3 days without an answer probably means that I should start implementing it... :)

3 days without an answer probably means that I should start implementing it... :)

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Question:
Open Have a look to LocalSolver, the first math programming solver based on local search. This new-generation model-and-run solver is able to tackle very l...
Have a look to LocalSolver, the first math programming solver based on local search. This new-generation model-and-run solver is able to tackle very l... [more]

Have a look to LocalSolver, the first math programming solver based on local search. This new-generation model-and-run solver is able to tackle very large-scale combinatorial optimization problems in minutes. Free for faculty and students!

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By Frédéric Gardi · Bouygues e-lab & LocalSolver

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7 Can someone give specific methods to convert frequency dependant viscoelastic properties into time dependant ones?
By venkata rao Ganapathiraju · Vasavi College of Engineering

venkata rao Ganapathiraju · Vasavi College of Engineering

Thanks to all those who have responded. I will take these leads further. GVRao

Thanks to all those who have responded. I will take these leads further. GVRao

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1 Fuzzy _pso modeling
By Chris Adika · University of Utah

Witold Kosinski · Polsko-Japonska Wyzsza Szkola Technik Komputerowych

Could you please be more specific, in your question? Are you asking about a software?

Could you please be more specific, in your question? Are you asking about a software?

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7 Looking for research collaboration or discussion partner
By Zhan Wang · University of Wisconsin, Madison

Anwar Hossain · University of Dhaka

Please see the list publication

Please see the list publication

PUBLICATIONS.pdf ×

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13 Matrix Equation
By Amran Hussin · University of Malaya

Amgad Mohsen · Mansoura University

Hello Maria , I'm afraid you can't solve such a system, viz AX + X^2 B = C easily, But Kronecker Product is true to be useful as a first step, to jus... [more]

Hello Maria , I'm afraid you can't solve such a system, viz AX + X^2 B = C easily, But Kronecker Product is true to be useful as a first step, to just make the nonlinear system appearing to be easy to be programmed. I think when you use the substitution X^2 = Y you have generated another unknown matrix Y , " you have only N equations for 2N unknowns " the resulting system is under-determined. the suggestive way is to deal the nonlinear system using methods efficient for such ones. I used search method to find the "minimizing vector " for the sum of the squares subject to constraints i.e. the equations themselves, I got really very small error bounds, and stability are guaranteed for even large systems. Regards,

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Question:
Open Research on dam failure mechanisms under the fluid-solid coupling.
What are possible mechanisms of failure at this point?

What are possible mechanisms of failure at this point?

By Mojraj Bagale · Liaoning Technical University

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10 Reg. speech enhancement.....How do we decompose a noisy speech into subspaces?
By Kirubagari Balasubramaniam · Annamalai University

Kirubagari Balasubramaniam · Annamalai University

in PCA we will find the principle components. In ICA we will find mixing matrix. Is it?

in PCA we will find the principle components. In ICA we will find mixing matrix. Is it?

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1 Applications of detection algorithm ?
By Aamir Rasool · B.V. Bhoomaraddi College of Engineering and Technology (BVBCET)

M. Hafizur Rahman · University of New South Wales

There are lot of applications of detection algorithms: motion detection (http://www.codeproject.com/Articles/10248/Motion-Detection-Algorithms), scale... [more]

There are lot of applications of detection algorithms: motion detection (http://www.codeproject.com/Articles/10248/Motion-Detection-Algorithms), scale and orientation detection, face detection, object recognition, robotic mapping and navigation, image stitching, 3D modeling, gesture recognition, video tracking, and match moving. DETECTION AND MULTI-APPLICATION ALGORITHMS: http://www.psicorp.com/technologies/chemistry/detection_algorithms.html

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