Materials Science

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Questions related to Materials Science

Why TE mode so important in rectangular Silicon optical waveguides?

I have some basic doubts- Why is TE mode so important in rectangular silicon optical waveguides? Why not TM mode? Why most researchers always prefer single mode over multimode waveguide? Could any...

27 September 2022 9,332 7 View

What is the right approach in micro/nanoindentation into the multilayer structure?

In a standard nanoindentation test of thin films, one must be careful about the indentation depth. If the penetration is too low (comparable to roughness), the resulting hardness can be much...

21 September 2022 6,699 1 View

What type of reaction occurs in alumina based and room temp. curring adhesive ?

Ceramic adhesives are used to seal ceramic assembly or to bind parts together. basically, a slurry to be applied in gaps, cracks or dents, that solidifies with no heat source and turns as hard as...

16 September 2022 145 4 View

What is subnatural linewidth?

i am trying to learn laser locking in Rb87 saturation absorption spectroscopy setup, while reading few papers i cam across the term "subnatural linewidth", I understand linewidth to be the FWHM of...

04 September 2022 7,844 2 View

Why is SEM of micro arc oxidation coating like this??

PEO coating

02 September 2022 1,691 1 View

How to get secondary gamma in mcnp ?

Hi everybody, please help I tried in mcnp6.1 the reaction is Au197(γ, γ`)Au197m, the energy is 10MeV, using f6, f8, but still have 0 secondary gamma, need the peak 279KeV and others more then...

31 August 2022 3,706 0 View

What is the contribution of negative oxygen ions present in low pressure oxygen plasma in terms of surface modification ?

As we know oxygen rf plasma is rich in terms of O(-) ion density. I want to understand how / what way these negative ions contribute to surface modification of substrate kept on powered electrode....

28 August 2022 8,139 2 View

Are there any biodegradable polymers can be used to make transparent shell of core-shell aqueous beads, apart from alginate ?

Hi everyone, Are there any biodegradable polymers around that can be used to form a shell (containing aqueous system) with high transparency, high permeability ? From what I know nowadays people...

24 August 2022 2,820 3 View

How can one calculate the hieght of a thickener?

A continuous thickener is a special clarify-er equipment consisting a round tank and paddle at the bottom. The paddle rotates with low speed (exp: 0.2 rpm). There are some important parameters...

22 August 2022 4,010 0 View

How to find energy difference per chemical formula between two structures using DFT (VASP)?

I am studying of double peroskites and trying to find its magnetic and electrical properties usinf VASP. Please help me to find energy difference per chemical formula between ferromagnetic and...

22 August 2022 7,012 3 View

Can anyone tell me how to create a file of coating like SiN as an ARC layer, for the PC1D simulator?

Suppose we want to coat Silicon nitride as an ARC layer. When using a refractive index with their wavelength PC1D show an error.

03 August 2022 3,035 0 View

MTT Assay HCl-SDS Solution Preservation?

Does anyone know if the solubilizing solution (HCl-SDS) can be preserved in any way? or does it have to be made each time before the experiment?

25 July 2022 5,534 1 View

How can I estimate the elastic potential energy dissipation in an enclosed spring system?

Dear all, I'm applying a given load to a spring. After compressing the spring, I will lock it to prevent any movement, and I will remove the load source. How can I estimate the load loss that will...

13 July 2022 1,850 6 View

During ion etching before XPS, what should be the energy of Ag+ ion and the sputter time?

I have to analyse my Chitosan Cu nanocomposite sample through XPS. I need an idea about the energy of Ar+ ion and the time of sputtering if etching is done prior to XPS analysis.

11 July 2022 8,554 3 View

Can somebody tell me how to calculate FMR linewidth and resonance field value from the FMR spectra with multiple peaks merged in a single peak??

I am doing FMR frequency variation by sweeping the magnetic field using a thin film, but the FMR spectra show multiple peaks merged in a single peak. 1. do I have to take the linewidth and...

11 July 2022 1,426 0 View

Forrtl: severe (157): program exception - access violation?

Dear scientists; I have the same problem in MCNP running. How can I fix the problem.

17 June 2022 3,828 0 View

Please, could you tell me why the zeta potential was zero no data? can I check my sample with TEM even if it doesn't have zeta potential?

Hi, everyone. I already synthesized the zinc oxide nanoparticles using ( the pellets of bacteria with lysis buffer + zinc nitrate 0.25 M). However, I have made characterization By DLS. Zeta...

15 June 2022 1,964 2 View

Simulation of an Optical Waveguide(OWG) structure in Synopsys RSoft CAD?

Hi, I am simulating an optical waveguide structure (Type: Channel) in Synopsys RSoft. It's Silicon Nitride structure embedded in SiO2 background material. The OWG structure has multiple openings...

06 June 2022 4,332 0 View

Why we use sodium aluminate and sodium silicate rather than alumina and when synthesizing zeolites ?

in the chemical composition of zeolites the formula is written with alumina Al2O3 and silica SiO2 while in the synthesis sodium aluminate NaAlO2 and sodium silicate Na2SiO3 are used.

25 May 2022 2,381 2 View

What is lattice mode in RAMAN vibration mode? In General, can you help me about what the lattice mode is in the RAMAN analysis?

What is lattice mode in RAMAN vibration mode? In general, can you help me about what the lattice mode is in the RAMAN analysis? I'm working on Sb2S3 thin films. During the Raman analysis, I saw...

21 May 2022 9,663 4 View

Rydberg energy by NBO using gaussian 16 ?

What is Rydberg energy by NBO using gaussian 16 ? If I want to know the orbital interaction between two atoms, do I need to consider the interaction including the RY (Rydberg) ? I would like to...

21 May 2022 2,282 0 View

Homebrew magnetic beads for purified DNA extraction?

Hi I would prepare a homebrew stock of ferrite magnetic nanoparticles (MNPs) coated with silica oxide. I`m going to use this stock for gDNA extraction/purification. Do you have any suggestions...

18 May 2022 4,206 2 View

Need a suggestion or model code to apply spectral quasi linearization technique for boundary layer fluid flow problem in matlab?

We are trying to apply spectral quasi linearization technique to solve fluid flow stretching sheet problem in matlab. We can solve the momentum equation alone in this method. We are in need of...

16 May 2022 7,642 0 View

Why does an antiferromagnetic material exhibit, FM like hysteresis curve?

Although the M-T measurement clearly exhibits an AFM behavior, the M-H measurement displays FM like hysteresis curve.

15 May 2022 9,762 3 View

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