How to calculate extinction coefficient (K) from transmittance?

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Has anyone come across any study of the varying spectrum, colour and CCT of daylight at various geographic locations/conditions?

CCT = Color Correlated Temperature Please provide references. Preferably for tropical regions. Thanks in Advance

08 September 2019 3,900 10 View

Why is the standard colour temperature for Daylight 6500 K?

Isn't 6500 K bluish? To me daylight looks yellowish. We've all coloured the sun and sunlight as yellow since we've been kids. Someone please explain why 6500 K is standard. Is it something that...

08 September 2019 915 4 View

Why is there a loss of information in the below mathematical operation?

To elaborate: If X = (convolution of p(a), q(a) ,r(a))/(convolution of p(a), q(a)) Y = (convolution of p(a), q(a) ,s(a))/(convolution of p(a), q(a)) Why is X almost equal to Y even if...

08 September 2019 7,789 5 View

Can someone explain how the size of the tolerance ellipsoids in the Lab space was defined?

Were they experimentally derived based on color perception from human subjects or can the size of the tolerance ellipsoid for every "color" be mathematically calculated for every point in the 3D...

07 August 2019 6,068 2 View

Can someone physically explain the conversion PROCESS of RGB color space to XYZ color space and LAB color space?

05 June 2019 6,117 16 View

How to convert RGB values to their corresponding colors and their dominant wavelengths in MATLAB?

I understand there's a challenge in the conversion as the colors are not monochromatic and there could be metamerism. I just want an approximation for the purpose of visualization of data.

04 May 2019 4,994 12 View

How do you define and measure human error in experiments?

For eg. sample variability in different solar cells (which are of identical configurations) fabricated manually.

08 September 2018 6,829 10 View

What is the colour of silver nanoparticles?

What would be the colour if AgNPs of sizes 50 nm - 80 nm, along with bigger aggregates are present together.

31 December 2017 9,214 4 View

Can anyone suggest some good journals to submit work on DSSCs with normalized impact factor between 1 and 3?

Thanks in advance for your help.

09 October 2017 9,925 3 View

How does Sigma Aldrich check for 99% purity of compounds?

For eg. I would like to what are the analytical techniques used in checking purity of natural dyes bought from Sigma Aldrich so as to conduct the same tests on the dyes extracted from other sources.

02 March 2017 8,688 2 View

Can polymer concentrations be calculated based on the number average molecular weight?

Hello, I spin-cast two different polymers onto wafers and measure their height as a function of initial concentration. For polymer A, I have the weight-average molecular weight (Mw) as well as...

28 February 2021 7,882 2 View

How to resolve Gaussian error termination " Error termination via Lnk1e in F:\G16W\l103.exe" for TS(QST3)?

When I run the job for TS(QST3) in gaseous phase, it was completed without any error. But when I add water in CPCM model it terminated with an error: Inconsistency: ModMin= 2 Eigenvalue=...

21 February 2021 3,198 2 View

Using the Pfaffl method: Is it possible that the ratio of the calibrator does not equal 1?

Hi all, I have a question regarding calculations using the Pfaffl method. I have 3 groups per experiment: 1 control group (calibrator) and 2 treatment groups with 6 to 7 biological repeats per...

19 February 2021 8,351 2 View

How to calculate radial distribution function (RDF) of a complex from Ab initio MD simulation trajectory?

Hi all, Is there any software or webserver to read the molecular dynamics (MD) simulation trajectory which obtained from Ab initio MD simulation to calculate the atom-atom radial distribution...

25 January 2021 9,474 3 View

Solving diffusion- reversible chemical reaction equation: How to solve both terms numerically?

I am using finite difference method to discretize the parabolic equation (explicit method), but confused about the chemical reaction term. Solving the generic equation for i specie involves a...

24 January 2021 1,149 18 View

Doubt in DFT geometry preparation?

Hi all, I am trying to perform some ab inito DFT calculations using cp2k code. I have a unit cell of 120 atoms and would like to know how to refine or reduce the number of atoms in the unit cell...

20 January 2021 6,024 3 View

Why it is required to optimize a unit cell generated from cif lattice parameters and atomic coordinates during ab initio solid state calculations?

A cif file represents a unit cell with minimum energy. My question is, in the start of any ab initio calculation for unit cell generated from the cif file, why we are advised to optimize cell...

19 January 2021 9,883 3 View

Is it possible to calculate entalphy of LiBr/H2O or another solution if we know correlation of specific heat without using any software?

17 January 2021 5,522 3 View

What is the best way to calculate electrical conductivity of semiconductors and the same system with a layer of oxide using Quantum Espresso?

I have tried BoltzTrap, and EPW but I'm not sure whether Boltzmann Transport Equation is a right approach for a complex system (semi cond. + an Oxide layer or even the semiconductor itself). Also...

11 January 2021 4,597 4 View

How to calculate IR and RAMAN spectra form Born charge ?

I am using crystal 17 for my solid state ab initio calculations. For some reason the program is not able to produce the Raman spectra but have generated born charges. Is there any way to produce...

11 January 2021 2,317 2 View