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

Has anybody been to any previous editions of the EUEC (Energy, Utility & Environment Conference)?

I'm planning to go to this year's edition in San Diego. It looks like a big event. My project is about CO2 capture so it kind of fits quite well in there. However, it would be nice to get some...

06 July 2014 2,669 1 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 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

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

03 March 2021 8,272 1 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

Do we need to write protocol for a second study of a systematic review that has been registered and published?

I have conducted and published a systematic review and meta-analysis research with the topic related to public health and health pomotion (protocol was registed in PROSPERO). Now we want to...

03 March 2021 8,920 3 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View