How can I calculate parameters of pseudo-second model for adsorption processes?

07 December 2020 3,541 9 View

How to implement the GLCM (gray levels co-occurrence matrix) matrix to determine parameters such as entropy, kurtosis, and others,using python+OpenCv?

How to implement the GLCM (gray levels co-occurrence matrix) matrix to determine parameters such as entropy,kurtosis, among others of an image, using OpenCV and scikit-image libraries?

26 July 2018 5,722 1 View

Has anybody built a survey questionnaire with already validated constructs from other surveys?

HI, do you have experience with using already validated questions (for various constructs, e.g. construct to assess risk behavior, construct to assess school performance) in your own survey...

05 November 2017 6,342 3 View

Can I use mixed methods if i have only quantitative data?

28 September 2017 6,553 6 View

Do you know any module to run a test to compare two matrices (same size) from different populations? I know some tests, but...

I am not an expert in multivariate analysis, son I need your help. I have many covariance matrices related to the items of a score. I have information from many populations. I estimated the...

09 August 2017 9,074 2 View

Do you know any module to run a test to compare two matrices (same size) from different populations? I know some tests, but...

I am not an expert in multivariate analysis, son I need your help. I have many covariance matrices related to the items of a score. I have information from many populations. I estimated the...

07 August 2017 5,126 2 View

What is the theoretical maximum for the energy efficiency in cathodoluminescence?

Reportedly, zinc sufide (ZnS) doped with Ag or Al or Cu is the most energy-efficient scintillator: one estimate says it's 30 %, that is, for an optimized composition (doping, crystal size, etc.) a...

28 December 2015 2,829 3 View

Can anyone assist me with the sample size calculation for school based survey in a stratified two-stage cluster sample design?

It is a cross-sectional study to find out associations between specific factors and smoking behavior. Target population: 13 to 15 years old adolescents in school settings; the population size...

11 December 2015 5,229 2 View

Do you have any knowledge with (Poisson-Logit Hurdle Regression) in Stata?

09 July 2014 3,637 2 View

Can anyone suggest a reliable force field for Cd++?

Can anyone suggest a reliable force field for Cd++?

31 July 2013 6,472 3 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

Logistical regression using SPSS for a dichotomous dependent variable, with an independent variable of 1, 2, 5 and 10 seconds?

I have an experiment with 28 participants The independent variable is the times 1, 2, 5, and 10 used as the cross hairs during a task These 4 times were tested using 4 different blocks, each...

03 March 2021 9,692 2 View