Angular momentum and the Dirac equation - interpretation?

The Dirac equation for a free particle reads H = c*alpha*p + beta*m*c^2 (Sorry for the miserable formatting - how to enter Latex Code or similar?) The commutator [H,L_i] is nonzero for any...

01 February 2021 7,037 1 View

How to measure abundance in an LC-MS/MS experiment?

Is the chromatographic peak a valid measure of a compounds` (relative) abundance in LC-MS data? We have recorded three MS/MS spectra; their retention time falls into a specific chromatographic...

13 January 2021 6,685 6 View

Which collaborative tools for interactively writing R code are out there?

I am searching for tools to collaboratively write R code together (and run it in an online environment). Crucially, the functionality should be similar to Google docs, i.e. all users should be...

26 May 2020 6,846 6 View

What are the greatest insights academic philosophy achieved during the past 100 years?

I'm seeking a justification for the existence of academic philosophical work. My question is about established 'insights': stable advances, which are largely exempted from any further controvery...

25 April 2020 644 9 View

Carbon coating of metal particles?

I am searching for potential project partners (companies) with experience in the carbon coating of metal particles.

03 March 2020 8,208 4 View

Method for the extraction of insect melanin?

Dear colleagues, does anyone know a reliable method for the extraction of melanin (from both cuticle and formed by immune activated phenoloxidase in the body cavity) from whole insects? Thank...

24 May 2019 962 3 View

Does anyone have barnase-resistant E. coli?

Promega is selling those Flexi-System Vectors. However, they come with Barnase as a selection marker and hence cannot simply be transformed into your usual library-competent E. coli strain. Since...

14 January 2019 480 4 View

Can one use 1,5-DAN (97% purity) for MALDI analysis?

1,5-DAN is a fantastic matrix for MALDI ISD (in-souce decay) analysis. Can anyone tell me whether one can use the cheaper 1,5-diaminonaphtalene (97% purity) instead of the much more expensive...

25 November 2018 211 3 View

Detection of pathway activation at the end of an experiment - which methods exist?

Problem: we want to know - at the END of an experiment - if a signalling pathway was activated DURING the experiment. I had read something about a novel technique that allowed this. I think that...

05 November 2018 9,372 3 View

Gaussian16, dG solvation free energy?

Is there any keyword missing to get an idea of the dG solvation free energy of a molecule? # M062X/6-31G* Opt SCRF=(SMD,1stVac,Solvent=water) From what I understand from the gaussian09 user...

25 March 2018 1,196 3 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

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

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View