Is a tetrahedron uniquely defined if all length of one triangle and all three angles between the edges of the opposite corner are known?

Known are the length in a triangle ABC of a tetrahedron ABCD, i.e., also all angles between A, B and C are known. The position of D is, however, unknown, but the angles between all edges to D,...

06 July 2019 2,933 3 View

Why the backscatter coefficient of electrons does not correlate with the density but with Z?

The backscattering of electrons obviously happens with the core of the atoms or ions. If it is related to the mass I would expect an impact of protons and neutrons. If it is an impact of the...

07 August 2018 3,170 7 View

Does anybody has exeperience in electrolytic preparation of aluminium alloy AA2024-T3?

We need an artefact-free preparation of AA2024-T3 for EBSD investigations? Does anybody have recommendations?

07 August 2018 7,608 14 View

Is there anything known about the formation of roaldite (Fe_4N)?

Roaldite is a mineral phase (possibly) described in steel but (rarely) discovered in iron meteorites. The structure looks like fcc iron containing in the center an N atom. Is there anything known...

07 August 2018 6,443 7 View

Broadening of XRD peaks by differently tetragonal martensite?

Already in 1927 Seljakow, Kurdjumow and Goodtzow discussed the observed broadening of martensite peaks by 4 different reason: a) grain size, b) concentration variation in solid solution, c)...

06 July 2018 1,685 14 View

Why martensite is described by space group type P 4_2/n?

The pseudocubic martensite (Fe-C alloy) is typically described as tetragonal phase. Why space group type P 42/n (IT-Nr. 86) is used? I 4/mmm would generate the same atomic arrangement, and also...

06 July 2018 7,512 9 View

Under which conditions the L-peak in TEM-EDX can become unusually high?

Recently we observed an effect we cannot explain. Investigating a sample in transmission electron microscope (TEM) which contains mainly C, O, F, and a bit Bi, also the Cu grid delivers a...

02 March 2018 8,897 29 View

How accurate is lattice parameter determination by CBED?

CBED (convergent beam electron diffraction) is known as one of the most sensitive techniques for local lattice parameter determination using electrons. I have no doubts regarding the precision of...

01 February 2018 6,296 3 View

Phase transformation fcc-> bcc during standard EBSD preparation?

We recently discovered a phase transformation during a careful metallographic EBSD preparation. Does anyone recongnized this, or does this effect has been reported already somewhere? The material...

31 December 2017 7,852 18 View

Elongated grains and no or a very weak fiber texture?

We've just analysed a microstructure of a cubic closed-packed (fcc) material. As visible from the color-coded IPF map (Y parallel to the long axis of the grains) the aspect ratio of the grains is...

31 December 2017 1,995 42 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

How climate change will influences human and animal behavioral change?

The role of climate change influencing the human behavior as well as economics interest

01 June 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View