How can you explain the reorientation effect in crystals ?

Dear all, When we discuss the XRD result of a given material, we talk often about the crystal reorientation effect. This situation takes place when we observe a decrease of peak intensity after...

01 February 2019 2,394 3 View

Optical properties of semiconductors ?

Dear all, In order to calculate the band gap of a given semiconductor material we use the following Tauc formula: (ahv)=A(hv-Eg)^n. We define A as a constant in all the papers. The question is...

31 December 2018 9,452 7 View

Particle and crystallite size?

Dear all, How can the particle's size varies with the average crystallite size ? Best regards, A. CHETOUI

11 December 2018 3,758 0 View

Question in maths ?

Dear all, One can expand the expression (x+y)^1/2 ? Thanks all of you, Abdelmounaim

31 December 2017 4,134 16 View

Thermodynamics

04 May 2017 10,051 4 View

Current in a semiconductor ?

Dear scientific community, If we circulated an electric cuurent in a semiconductor, on how deep this latter flows in the material ? Best Refards, Abdelmounaim

08 September 2016 8,415 1 View

Gas sensing mechanism ?

Hello scientific community, I have a question about the gas sensing mechanism by n and p-type metal oxide semiconductors. It is well known that the gas sensing mechanism is in most cases related...

06 July 2016 1,030 11 View

Question about adsorption ?

Hello scientific community, I would like to ask you a question concerning the adsorption. one could give a clear explanation about the difference between " the weak chimisorption" and...

06 July 2016 6,172 1 View

Doping of semiconductors ?

Hello Scientific community; We heared about the bulk doping. what's the diffrence between the bulk doping and surface doping ?

04 May 2016 4,357 2 View

Effects of dopant ?

03 April 2016 3,653 4 View

No title

02 March 2021 3,060 3 View

How does Scientist/RG community evaluates a case study article and the impact of it on a researcher career?

An article that is published as a case study in the SJR listed journal. How much value is added to a researcher career? How it is evaluated by a scientific researcher/University admission...

02 March 2021 9,661 3 View

The Shannon's index is inversely proportional to Simpson's index (1-D)?

I'm having a problem with my bloxplot with Shannon's and Simpson's indexs. The value of Shannon for my Community 1 indicating higher diversity (in relation of the Community 2), but have lower...

26 February 2021 3,033 9 View

How to compare 2 samples recruited with different sampling methods?

If I want to compare characteristics of 2 groups of patients, one group is recruited from a random sample of the general public while another group is from a sample with a fixed gender (male to...

26 February 2021 3,526 3 View

What could be the reason for not having further low chi square value (better agreement) in my refinement result?

I have tried every combination of parameter changes and after that i have a poor chi square value. I can't get it lower any further. I know there have been a lot of discussion about Rietveld...

26 February 2021 8,480 3 View

Why the CHi^2 is close to zero with a bad fitting but the Rp and Rwp are still high?

I am refining my XRD data using in FullProf program. The intensity of the modulated X-ray peaks is almost flat. I tried to adjust the peak intensities but unsuccessful. What is the reason? I guess...

23 February 2021 2,304 4 View

Do you consider undergoing a structure literature review / Meta analysis and getting numerical findings sort of quantitative method?

I am looking for a classification of the research methods included in literature review papers or Meta analysis ones .

22 February 2021 1,131 4 View

How to run repeated measures in mvabund?

I have a dataset of fish species abundances collected from 6 different habitats over the course of 30 years. Fish were collected multiple times per year and environmental variables were recorded...

21 February 2021 3,838 1 View

Can I do two kinds of mixed method in explanatory research?

Dear distinguish professors and scholars, I have a research in measuring two kinds: think tank capacity and research impact on policy. Can I do two kinds of mixed methods in order to find, "Is...

20 February 2021 6,897 1 View

How to analyse a (perceptual) study using differing/comparable sets of stimuli?

I plan on running an online perceptual experiment that has, let's say, 100 unique video stimuli altogether. Since these are too many to be rated by every participants, I would like to present the...

15 February 2021 7,444 2 View