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

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

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

03 March 2021 8,272 1 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

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 1 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

Can NFL theorem be valid in infinite search space in ML?

NFL theorem is valid for algorithms training in fixed training set. However, the general characteristic of algorithms in expanded or open dataset has not been proved yet. Could you show your...

01 March 2021 1,189 3 View

Does anyone know HRM channel in a 2 plex QIAGEN Rotor- Gene Q qPCR can be used as a separate channel?

I am going to have 3 different probes in my qPCR work that I am going to do. But I realized that the machine we have in the lab is a Rotor-Gene Q 2plex HRM Platform, saying it has green, yellow,...

01 March 2021 8,544 1 View

I have designed reflectarray element and feeding it though Horn Antenna on HFSS. After full wave simulation, I am not getting desired results?

I have designed reflectarray element to generate OAM beams at 5.8GHz and feeding it though Horn Antenna on HFSS. After full wave simulation, i am not getting desired results i.e Radiation pattern...

01 March 2021 9,701 5 View

Any research papers for extraction of nutrient deprivation on macroalgae? Analysed by HPLC-UV and GC/MS. Possibly from macroalgae genus Rhizoclonium?

I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...

28 February 2021 6,477 1 View

Microstrip antenna design tutorial of HFSS 3D layout module ?

I have designed a 24 GHz rectangular antenna on HFSS 3D model and got desired results while desing the same antenna with same dimensions I am getting resonance frequency at 27 GHz I am...

28 February 2021 4,426 2 View