In lasers what is the physical process that is responsible for directionality...?

In normal radiation the atomic transitions from higher to lower states are random and the corresponding energy difference is spherically emitted in all the possible directions. In lasers a larger...

03 April 2018 9,525 3 View

Is it possible to fabricate some nanostructure that may absorb the entire solar spectrum...?

Is it possible to create some nanostructure so as to absorb the entire solar spectrum. If not then What are the major challenges in this field...?

02 March 2018 3,502 28 View

What one should have in mind before going through any material characterization technique...?

Although its a very basic question but i think it must be discussed in forum like this, that before we start studying any property like electrical, optical, thermo-mechanical etc. of any sample,...

09 October 2017 1,238 19 View

What should be kept in mine before going through any characterization of materials under study...?

Although its a very basic question but i think it must be discussed in forum like this (ResearchGate) that before we start studying any property like electrical, optical, thermo-mechanical etc. of...

08 September 2017 216 0 View

How hardness is related to the conducting properties of a material.....?

Does anyone have any idea how hardness of a material is related to the conducting properties of a material specifically in the context of Chalcogenides.

09 October 2016 1,526 3 View

How hardness is related to the conducting properties of a material.....?

How the hardness of a material is related to the conducting properties of a material specifically in the context of Chalcogenides?

08 September 2016 704 0 View

What may be the possible reasons why photoconductivity is not observed in Se rich Ag doped Chalcogenides ?

Dear colleagues right these days I'm working on some binary alloys of Se rich Ag doped chalcogenide glasses. In these samples photo current is not observed whereas only 2 % addition of indium...

05 June 2016 6,894 4 View

How one can interpret the results of SEM(Scanning Electron Microscopy) image in the view of condensed matter physics ?

04 May 2016 8,929 17 View

Would we ever be able to measure experimentally the quantity of human emotions having some numerical value?

Is it possible to quantitify the magnitude of human emotions? Like anger, hate, love, affection, sorrow, greedness etc. Would it be possible in near future to prepare a table having a column with...

04 May 2016 1,453 4 View

What is the role of dangling bonds in amorphous semiconductors?

Other than defect states responsible for hoping conduction, what is the role of dangling bonds in amorphous semiconductors specially in the context of chalcogenides?

04 May 2016 297 9 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

What is the state of the drug inside solid lipid nanoparticles (SLNs)?

I am a little confuse with the mechanism of solid lipid nanoparticles (SLNs). The main point of encapsulating drugs into SLNs is because some drugs have low solubility in water. Therefore, SLNs...

01 March 2021 3,703 3 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

Should we reduce the standard unit of length to 0.31951540592 meter ?

The reasoning behind this question is to align the ratios of the proton potential in energy per charge to the speed of light in distance per time. As these two dimensions appear to be related,...

27 February 2021 947 7 View

How do you mesh a thin solid in Fluent?

Hello, I have used the shell function on SpaceClaim to create thin solids for the model I am studying. These are contained within an enclosure for my study. I chose this approach as it avoids the...

24 February 2021 8,856 3 View

No streamlines present in a small region inside a flow. This means exactly what?

No streamlines present means whether the flow is getting obstructed there and the velocity inside the region is zero? Or else, the fluid is trapped inside that region with a nonzero velocity?...

22 February 2021 5,249 10 View

How to overcome convergence issues in concrete arch models?

Hi, I have modelled a three-span arch bridge with soil fill over along with pedestals. The FE modelling is done in LUSAS with HX8M solid elements (i.e. 3D solid modelling). The non-linearity is...

20 February 2021 1,346 2 View

How to solve the fatal error "the entire source was rejected" in MCNP?

Simple geometry was made having concentric cylinders bounded by a square region. The geometry has a reflective boundary. The source was defined at one point in the boundary and when it had been...

17 February 2021 4,364 3 View