For modelling epoxy-based matrices (in composites), which model in ABAQUS is the most suitable, Concrete damaged plasticity or Drucker-Prager model?

I am working on developing a micromechanical FE model for predicting kink-band formation in UD composites. To model matrix plasticity, which model, out of Concrete Damaged Plasticity and...

28 February 2021 5,415 1 View

How to derive the expression for the View Factor of a configuration of two bodies, starting from the general case ?

Hi all : Please, I need some help on Heat Radiation Transfer: How I can derive the formula of the View Factor for a particular configuration, in a way of ending with an expression for the VF as...

15 May 2020 4,929 6 View

Radiation Heat Transfer between a Hot body and a real Surface ?

Hi all , How can I consider the Optical properties of a surface into the Stefan-Boltzmann law for a problem of Radiation Heat Transfer between a hot Body and a real Surface (namely, a surface...

15 May 2020 9,449 8 View

Is this a well defined Integral ? If so, does anyone can help me to solve it ?

Dear all : I need to solve the following integral (attached as an image file) The context is on the calculation of View Factors in Radiation Heat Transfer I worked out the this expression from...

15 May 2020 7,500 16 View

How to calculate the Solar Radiative Flux arriving to a Solar Plate Collector placed on the surface of Earth ?

Hi all, I'm trying to perform a calculation on the Flux due only to radiation, received at the surface of a Flat Plate Solar Collector placed on the surface of the Earth. The collector is tilted...

14 May 2020 604 24 View

Air Velocities and Temperature Distributions inside an enclosed air cavity, modeled in COMSOL Multiphysics ?

Dear all : I'm trying to solve the following problem using COMSOL Multyphysics. I have an enclosed geometry (please see the attached images) with a top flat surface (the celing) and an undulated...

19 March 2020 7,455 5 View

Simulation of an Air Solar Plate Collector in COMSOL Multiphysics. Problems with defining the Boundary Conditions ?

Dear all: I need help, I hope there is someone out there who can help me. I finish drawing the 2D geometry of an Air Solar Collector with an undulated absorber plate (in contrast with a flat...

19 March 2020 5,935 9 View

Does the value for the Seebeck Coefficient (S) measured with a Voltmeter can really be taken as the S of the test material ?

Hello to all : This question is originated from the idea that every material (except for Superconductors) has a Seebeck Coefficient (S) different than zero, and from the idea that in every case...

19 March 2020 4,192 5 View

Geophysical response of Water uptake by trree?

When plant takes water from.the soil and the water is transpired by the stomata, is it possible to measure the SP potential...if it is attempted by any one, can you share what kind of electrode...

08 March 2020 6,726 3 View

Diffusion of Carbon atoms in Bismuth Telluride ?

Dear Colleagues : Does anyone have literature referencing the diffusion process of Carbon (I mean Carbon atoms) into Bismuth Telluride (Bi2Te3) or into some other compound alike ? E.g. PbTe,...

05 March 2020 2,976 2 View

How to convert isotrophic Deriche filter into anistrophic?

12 February 2021 5,889 6 View

Hi all, would you suggest good books for Image processing, Computer vision, AI, Deep learning, machine learning, and remote sensing?

I would like to get good books for Image processing, Computer vision, AI, Deep learning, machine learning, and remote sensing. Kindly suggest good authors books for the above topics and its links...

09 February 2021 3,561 11 View

How to conduct mesh sensitivity/convergence analysis in MSC Marc Mentat?

Currently using Msc Marc Mentat for FEA. Now i conduct the mesh convergence/sensitivity analysis manually. So I need to know if there any automatic way to conduct the mesh convergence/sensitivity...

04 February 2021 3,310 3 View

Why doesn't semen analysis usually use darkfield microscopy?

From examples I've seen online, brightfield has too-low contrast and phase contrast has large (diffraction?) halos that can look like noise.

15 January 2021 3,155 1 View

Is it easy to handle discontinuities in objective function with mathematical optimization?

Mathematical programming is the best optimization tool with many years of strong theoretical background. Also, it is demonstrated that it can solve complex optimization problems on the scale of...

07 January 2021 8,757 22 View

Could one suggest a common formula for Penicillium Chrysogenum spore counting by spectroscopy? and also its nm?

I am working with this strain but I do not have the formula for spore counting. please just suggest a spectrophotometric method.

05 January 2021 4,308 3 View

Does anyone know about vision-guided control of civil structures?

I would like to know more about the following issues: 1. Using images as feedback for the closed-loop control of civil structures 2. Simulating the vision-guided control on the computer without...

03 January 2021 7,566 1 View

Why train curves are being repeated in this five fold cross validation?

Hello, I am using ...... optimizer = RMSprop(lr=1e-4, decay=1e-6) N_FOLDS = 5 EPOCHS = 20 INIT_LR = 1e-4 Train_Batch_Size = 32 Valid_Batch_Size = 32 decay_rate = 0.95 decay_step =...

30 December 2020 2,519 3 View

Why both Training and Validation accuracies stop improving after some epochs?

I am using data augmentation and decaying learning rate after each epoch. If I don't use data augmentation but keeping callback, then my training accuracy reaches to 99.65% but not validation....

15 December 2020 716 10 View

Any good conferences on uncertainty and sensitivity analysis?

Hi everyone, I was wondering if there are any good yearly generic or field-specific conferences on topics of sensitivity and uncertainty analysis. Thanks! Shahroz

14 December 2020 9,347 5 View