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

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

Chlorinated organic formation in odor control scrubbers using hypochlorite?

I'm involved in a study of odor control technologies for municipal wastewater treatment plant. One of the control options involves a chemical 2-stage (acid/alkaline) packed bed scrubber. The...

03 March 2021 3,661 2 View

What solvent can I used for Paal Knorr reaction between 6-amino hexanoic acid and 2.5 hexanedione?

I am try to make the Paal Knorr reaction between 2.5 hexnedione and 6-amino hexanoic acid, my problem is type of solvent to use, because 6-hexaminohexanoic acid is soluble in water but I am not...

02 March 2021 4,443 2 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

Ester cleavage conditions?

Hi all, I need to cleave the ester in Ethyl 2-amino-1H-imidazole-5-carboxylate to make the carboxylic acid and retrieve the product from solution to use in downstream applications of linking to...

01 March 2021 8,766 3 View

How to quantify carbon deposition on CuZnAl catalyst?

Dear All, I want to quantify carbon deposition on the surface of the CuZnAl catalyst. I have tried thermogravimetric analysis, but I've got weight gain as the active Cu- get oxidised. Does anyone...

01 March 2021 1,907 3 View

Why Trivalent chromium start precipitating above PH 5 ? Moreover discuss difference between adsorption of chromium and precipitation of chromium ?

I am a student of MS Environmental Engineering and started my research phase. I am working on metal removal ( chromium iii ) by using activated carbon prepared from the agricultural feedstock. So...

01 March 2021 5,475 2 View

How to remove DCU and HOBT from my reaction?

I am doing a acid and a chiral amino alcohol reaction using DCC and HOBT in DCM or THF? Can anyone suggest me how to remove DCU and HOBT from a reaction mixture??

28 February 2021 2,153 1 View

What is the most common number of epitopes in an multi-epitope Vaccine?

hi everyone, I'm interested in the field of vaccine design specifically multi-epitope cancer vaccines , I want to know if there is a minimum and maximum number of epitopes we could use in a...

27 February 2021 3,882 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