When was the arrow symbol for a vector first used?

Arrow symbol for a vector . My question concern the use of an arrow to represent a vector. For a spatial vector, it shows the direction, and this is also the case for the vector representation of...

06 July 2018 4,995 1 View

Name of material constant k/mw?

08 September 2017 7,731 0 View

How come that the 1/r potential is so exploited, e.g. in electromagnetism when there is no source?

05 June 2017 6,819 14 View

Stationary waves?

What is the recent 'definition' of dualism? Does it concern a particle and its interaction, or more a particle in a traveling wave motion? Can it be described with a density, or will that be a...

05 June 2017 5,979 32 View

Interactions between scales for solutions?

Are there any general statements to refer to, concerning this? For example so-called acoustic pressure occurs both in the water and in structures in the water, so that is one case. Other...

05 June 2017 3,754 5 View

How is an entropy wave derived from Navier-Stokes?

There is an entropy inequality in fluid mechanics, and from bounds to that, a first order wave (convective wave) is given. With assumptions of ideal gas, internal energy proportional to...

05 June 2017 6,334 9 View

Models for light?

What models are there for light in a plasma and in a lightning at thunder? Maxwell's equations is not so easy to invoke in continuum mechanics.

05 June 2017 7,827 11 View

Studies of wavelets with dimension?

Are there any famous and easy to read, or benchmark study on wavelets, where they use dimensions for time and frequency? If the amplitudes have a correlation to spatial coordinates, for any...

04 May 2017 3,772 2 View

When is the onedimensional energy equation applicable?

I looked at energy conservation in e.g. a pipe, assuming internal energy proportional to temperature. Then with the ideal gas law, the static solution is a mode shape, with wavelength depending on...

04 May 2017 8,361 2 View

HV Transmission pole (possible scaling and function?)

01 February 2017 8,402 3 View

Looking for Materials with high thermal expansion coefficient and high temperature resistance?

03 March 2021 8,272 1 View

Research on Supply Chain Management in Indian context?

Hi, I am planning to apply for the PhD degree in the Supply Chain Mgt. with specific area of "Cold Storage warehouses" during Pandemics and wars. Where lock downs and shut downs are frequent....

02 March 2021 285 2 View

Energy minimization in LAMMPS using NVT ?

How do I do energy minimization in lammps with NVT ensemble ? I am using the following command and it does not seem to work. It stops at extremely high energy and gives me the error zero search...

01 March 2021 2,294 3 View

Why is the sum of the elements in a row in a Q matrix equal to zero?

When explaining substitution models, the substitutions are expressed as Q matrix. Why is the sum of the elements in a row zero?

28 February 2021 3,864 3 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

Why do the air flow results vary totally when adding scalar in CFD ?

Dear All, We are using Autodesk cfd to calculate the air flow in a single sided naturally ventilated room, where air flow depends only on buoyancy due to temperature difference between inside and...

25 February 2021 9,602 4 View

What is the suitable range of Sulfur content and Viscosity of Heavy fluid Oil that used in Kiln?

What is the disadvantages of high sulfur content to the ceramic burning process? and what is the effect of outranged viscosity?

24 February 2021 8,219 2 View

EMSA troubleshooting. Protein-DNA complex not migrating, cold probe lane with multiple bands. Can anyone help?

I'm running an EMSA to show the DNA binding activity of recombinant proteins versus the Wild type. Previous assays run by my research group using a different test system show the protein-DNA...

24 February 2021 8,325 1 View

Why the CHi^2 is close to zero with a bad fitting but the Rp and Rwp are still high?

I am refining my XRD data using in FullProf program. The intensity of the modulated X-ray peaks is almost flat. I tried to adjust the peak intensities but unsuccessful. What is the reason? I guess...

23 February 2021 2,304 4 View

Can we use a compensation matrix with single staining that the negative population for each single staining is below zero?

Recently we used single staining to make a compensation matrix. But, for each single staining we saw that 13 to 25 percent of our negative population had been shown below Zero. In this situation...

21 February 2021 9,982 2 View