Any simple method to calculate the lattice parameters of a crystal lattice of a known configuration (i.e. orthorhombic) from XRD spectra?

Several of the methods to do this are explained in a rather involved way; could somebody simplify / give us a basic idea of how to use these methods and how they work? P.S. Please don't say...

02 March 2018 8,479 1 View

Is there a way to calculate the variance of a measured sauter diameter?

From the definition of Sauter mean diameter in the below link: http://www.thermopedia.com/content/1108/ Can we assume the variance to be in the following form?: variance = (d_64)^2 - (d_32)^2 OR,...

04 May 2015 2,351 4 View

How can one estimate the viscosity of a ferrofluid (no magnetic field present)?

Is there any analytical way of estimating the viscosity of a ferrofluid (iron oxide) without the use of a rheometer [no magnetic field also]? I tried surveying the literature, but the papers on...

11 December 2014 2,209 7 View

Why is the capillary number (Ca, Nc) ~1 for a very high velocity of motion?

10 November 2014 9,403 1 View

If I want to make an emulsion, can I mix two surfactants with a similar HLB (i.e. HLB~4 with HLB~1.8)? Will this result in any complications?

Note that these HLB values show greater affinity towards an oil phase relative to an aqueous phase

09 October 2014 3,117 10 View

Suppose there is a propeller inside a stationary cylinder submerged in water. Can you elucidate the velocity profile of the moving propeller?

[See attached figure] There is a significant gap between the propellers and the cylinder (figure 2) and we want to elucidate the velocity profile at this gap and the bottom of the cylinder. Is it...

09 October 2014 5,324 5 View

Not getting the correct theoretical lines when I do Rietveld Refinement

I've been trying to get the correct theoretical peak positions [vertical lines] when doing Rietveld refinement for my material. My material is MIL53ht. I have input all lattice parameters in...

01 January 1970 3,959 7 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 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

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 1 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

What is the characteristic length to determine the Reynolds number for the scattered turbulent fluid flow?

Dear all, I just saw this example in FB on the difference between laminar flow and turbulent flow. The flow from a pipe hits the sink and scattered. The flow from the pipe is characterized as...

02 March 2021 1,999 5 View