Can the Time weighted average (TWA) exposure concentration be estimated starting from the Short-Term Exposure Limit (STEL)?

Hello, I have got an MSDS indicating the STEL of a compound and I'd like to know what the relevant TWA would be. Is there a general ratio which roughly links the two parameters (regardless of the...

31 December 2019 4,439 4 View

Could anybody provide a reference on the X-ray diffraction pattern of silicon?

Hello, I am after a paper reporting the X-ray diffraction pattern of silicon, possibly including all the diffraction peak positions. Thanks, Antonio

09 October 2019 9,644 4 View

How is water activity of pharmaceutical products measured?

Hello All, Which methodology should I follow to measure water activity of pharmaceutical materials? I am aware that there are two USP procedures in this regard, chapter 922 and 1112. Which of...

04 May 2019 4,158 5 View

How can I calculate the time per step if scan range, scan speed and step size are known?

Hello All, I am trying to reproduce an XRD method. I know scan range, scan speed and step size. How do I work out the time per step? Thanks, Antonio

05 June 2018 225 8 View

Could anybody provide references to water vapour pressure data at 25deg for the saturated solutions of the following salts?

I am just looking for references on water vapour pressures for the saturated solutions of the following salts: LiBr LiCl MgCl2 Mg(NO3)2 NaCl KCl KNO3 I have found the following reference...

02 March 2018 8,365 2 View

Could anybody suggest any (possibly pharmaceutical) material which could be used for PXRD proficiency testing?

I would like to fin out more information about which type of material (ideally pharmaceutical compounds) could be suitable to perform both qualitative and quantitative Powder X-ray diffraction...

31 December 2017 2,559 10 View

Could anybody suggest how to calculate the heat of adsorption/desorption from heat flow data (DSC) in mW?

Hi, I have got some DSC data related to the heat flow in mW (milliWatt I presume?) measured during adsorption/desorption of CO2 onto/from an activated carbon. I'm getting some inconsistent...

05 June 2015 3,006 5 View

Could anybody advise about the demineralization procedure of activated carbons?

01 February 2015 9,201 4 View

Could anyone recommend any companies in UK to purchase activated carbons from?

I'd need to purchase some activated carbons. Ideally, I would need two different type of products, a carbon having high micropore volume (d

06 July 2014 2,299 2 View

What is the best technique for investigating the presence of CaO in a solid sample?

I've seen from the literature that XRF gives results in terms of oxides (e.g. CaO). Is this correct? What's the difference in terms of chemical composition results between XRF, XRD and EDX?

05 June 2014 716 15 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

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

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

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

Irradiation data for JAPAN?

Hi, Could you help me to get the latest (2019, 2020) solar resource data for a particular site in JAPAN? PV GIS and NSRDB data are not in reach to JAPAN, I'm looking for some other database for...

03 March 2021 961 3 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View