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

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

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

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

What techniques can I use to determine the miscibility of polymer blends?

The term miscibility refers to the single-phase state in thermodynamics. I do not mean the compatibility of different components. To determine the miscibility I know several techniques such as...

03 March 2021 4,107 4 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 View

How to repeat an operation on an atom selection for multiple times in PyMol?

Hi, I am trying to construct a multi-layer fibril structure from a single layer in PyMol by translating the layer along the fibril axis. For now, I am able to use the Translate command in PyMol...

02 March 2021 4,569 4 View