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

Rietveld refinment method ?

07 August 2016 7,292 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

What is the characteristic length to determine the Reynolds number for the scattered turbulent fluid flow?

Dear all, I just saw this example in FB on the difference between laminar flow and turbulent flow. The flow from a pipe hits the sink and scattered. The flow from the pipe is characterized as...

02 March 2021 1,999 5 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

What are anisotropic electrical and optical properties of a semiconductor due to?

In some materials, properties such as band gap, thermal conductivity differ along different crystallographic axes. What are the basics?

01 March 2021 1,923 3 View

Issues with Permeabilization during Flow Cytometry?

Hello Everyone. Currently I am working to characterize macrophages in the myocardium after ischemia-reperfusion injury in rats. Due to the low total cell number isolated from rat hearts I can...

01 March 2021 3,867 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

Why do the air flow results vary totally when adding scalar in CFD ?

Dear All, We are using Autodesk cfd to calculate the air flow in a single sided naturally ventilated room, where air flow depends only on buoyancy due to temperature difference between inside and...

25 February 2021 9,602 4 View

Unknown debris sheets observed in cell culture flasks?

Hi, We culture neural progenitor cells in T175 culture flasks coated with PLO-Laminin. We have successfully grown these cells with our protocol for months. Recently, we observed large sheets...

25 February 2021 3,443 4 View

How the Ground Plane implantation is performed without damaging (and w/o varying the undoped nature) the top Si (8-10 nm) in FDSOI technology ?

It is a general practice to introduce Ground Plane in FDSOI devices under the BoX. The Ground Planes are introduced by Ion Implantation through Top Si layer and Buried Oxide. I wanted to know that...

24 February 2021 5,974 4 View

Can a semi-conductor material have different absorption coefficient?

Does the absorption coefficient of the semiconductor changes with the change in the structure of the semiconductor? If you have a thin film and nanowire of the same semiconductor, will the...

23 February 2021 9,799 4 View