What is the best column temperature program to analyze BTEX concentration in dichloromethane extractant using GC-FID method with hydrogen carrier gas?

I tried the temperature program below to draw my calibration curve using splitless injection but the peaks I got were so small and broad in the concentration range of 5 to 50 ppm. I was wondering...

19 November 2020 4,531 3 View

What can be the reason for increase in spectrophotometer absorbance for the same solution with the same pollutant concentration?

I am using a UNICO SQ-2800 single beam spectrophotometer and a quartz cuvette. before, I had measured the absorbance of a 10 ppm methylene blue solution (DI water solution) at its peak wavelength...

09 July 2020 4,970 6 View

Does anyone know if there is a reliable method to determine oil concentration (crude oil to be precise) using a UV-Vis spectrophotometer?

happy new year fellow researchers, I'm working on treating synthetic oily wastewater made from mixing distilled water, crude oil and surfactant.

31 December 2019 6,295 3 View

Is disk fusion test a good way of evaluate for peptides and enzymes?

the peptide which i have tested is about 100aa(hepsidin+ hydrophobin) and i haven't seen any inhibition zone, can it difuse through the muller hinton agar?

10 December 2018 7,552 2 View

What is the aim for evaluating Antioxidative activity/ Oxidative stress resistance of lactobacillus strains in related trials?

I am wondering the necessity for this evaluation in different probiotic trials. I appreciate any colleagues who could help me with this question.

01 December 2018 2,666 14 View

How should keep my Forest plot from reflecting my continuity correction in event/total?

Stata would faile to conduct metan, until I changed my 0 mortalities in Excel to 0.5 as a continuity correction, and exported the sheet to Stata. What can I do to prevent this to be shown in the...

19 November 2018 6,612 2 View

What transform or techniques can help in solving or analyzing functional differential equations?

laplace/fouriers transform and some techniques like operators/wronskian ... are useful in solving linear and nonlinear differential equations. however is any such techniques or transformation to...

14 December 2017 1,068 3 View

Can Multiple sclerosis(MS) disease be cured with Electrical Stimulation ?

Multiple sclerosis(MS) is demyelinating disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged . In some cases we use FES ( functional electrical...

17 September 2016 7,422 3 View

What topics are relevant to smart grid?

smart grids is an active research topic in various disciplines . here I am looking for all disciplines and fields that are kinda involved in smart grids research and industry. the most important...

05 September 2016 9,837 13 View

What are the best references for SigInt , ELINT and COMINT?

there are huge amount of reference in the field of SigInt , ComInt And Elint. but there should be a few basic and selfcontained reference in each of those. so please if you know any references ,...

28 February 2015 3,253 1 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

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

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

How to repeat an operation on an atom selection for multiple times in PyMol?

Hi, I am trying to construct a multi-layer fibril structure from a single layer in PyMol by translating the layer along the fibril axis. For now, I am able to use the Translate command in PyMol...

02 March 2021 4,569 4 View

The procedure compute?

02 March 2021 5,204 3 View

How to calculate BREQ 3 questionnaire?

how to calculate BEHAVIOURAL REGULATION IN EXERCISE QUESTIONNAIRE BREQ 3 ,which contain 24 questions and each question has 5 answers (0- Strongly disagree , 1-disagree, 2- Neither agree nor...

02 March 2021 811 3 View

Is there a powerful system for the security of the systems distributed on IoT systems?

Is there a powerful system for the security of the systems distributed on IoT systems?

02 March 2021 3,858 10 View

How to calculate average trend in maximum annual NDVI from MODIS?

I am wanting to calculate the average trend in maximum annual NDVI in Iceland from 2010-2020 using MODIS MYD13Q1 V6. How would I do this? I have currently inserted the NDVI bands from the MODIS...

02 March 2021 752 2 View