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

Could you recommend any books about Number Theory?

Beginner level books. High level books. Analytical Number Theory. Algebraic Number Theory. Combinatorical Number Theory. Books about partitions. Books about primes.

03 March 2021 7,174 5 View

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 View

Gel electrophoresis result for total RNA samples, 1.5 Agarose gel was used, How to improve the integrity of RNA?

Gel electrophoresis, RNA degradation, RNA extraction from fresh tissue

02 March 2021 5,433 5 View

Isolates of Hymenoscyphus fraxineus?

Dear Dr. Cai, my name is Simone Prospero and I work in the team of Phytopathology at the Swiss Federal Institute for Forest Snow and Landscape Research (WSL;...

01 March 2021 1,133 1 View

How to eliminate Steady state error from Reinforcement learning genetic algorithm code?

The following code (see 1st 2 images attached) is used to produce PID controller values that are designed to control the system (G). The code finds the PID controller values (noted as k) by using...

28 February 2021 6,560 14 View

What is Flat Lens Antenna?

28 February 2021 5,433 3 View

Can impedance of antenna be less than 50 ohms?

I am simulating helix antenna in hfss, right now, giving excitation with 50 ohms port. When I see the results of Z parameter (real). It shows lower than 50 ohms. Do not understand, if it can be...

27 February 2021 4,218 7 View

What are the application of Fixed points thoery in Chemistry.?

It is said that fixed point theory has lot of applications not in the field of mathematics only but also in various areas. So I am looking for applications in Chemistry only..

26 February 2021 3,533 1 View

LEDs on Vis Light photo degradation of MB water sol via N doped TiO2 in a mini flume?

Good day to all, I have no experience with light emitting diodes. I am building a glass mini flume to demonstrate the photo degradation of Methylene Blue in water running over self cleaning...

26 February 2021 4,026 5 View

CGA 300 Regulator for CO2 cylinder?

Has anyone ever tried to deliver CO2 with a CGA 300 regulator? I know that a CGA 320 regulator is standard for CO2. The issue is that I currently do not have any free CGA 320 regulators. I also...

25 February 2021 3,292 3 View