How to make ppb level concentration ?

Hi, I've N2 gas cylinder and 100 ppm NH3 gas cylinder. With these two cylinders, I'd like to make a ppb level (1- 100) concentration. Any idea how to do that?

01 February 2021 3,264 2 View

How to export Mass and Stiffness matrices using Ansys Workbench?

Hello, I am trying to export Mass and Stiffness matrices using Ansys Workbench via Modal analysis modular, with APDL commands inserted. However, there is no .matrix file generated. Could anyone...

17 December 2020 1,196 5 View

Best methodology to calculate food footprint in a university campus through students inquiring?

Hello, Considering sustainability and environment negative impacts of animal based products, I would like to calculate food footprint in a Portuguese university campus through students...

05 December 2020 9,098 3 View

Lactophenol Cotton Blue with benzyl alcohol?

In the preparation of a Lactophenol Cotton Blue, can phenol be substituted by benzul alcohol? (Question for some students in a laboratory lacking some reagents.)

03 December 2020 8,621 1 View

Can likert-type statements formulation derive solely from literature review?

28 October 2020 9,951 3 View

What pressures should I choose in a reheated rankine cycle?

09 October 2020 9,117 4 View

What is the best way to evaporate a large volume of aqueous solution quickly?

Let's say I have 100 mL of an aqueous solution and I wish to reduce the volume to 5 - 10 mL. What's my best option? - Rotavap is ruled out because we do not have a vacuum pump that can create...

09 September 2020 2,534 8 View

Will the electric field generate a current in a conductor?

If a conductor (copper wire) is put into an electric filed, will there be a current generated in the conductor (when the two ends of the conductor is closed.) I am thinking there will be only a...

01 September 2020 5,505 3 View

How to disperse polystyrene nanospheres in water surface for Langmuir Blodgett?

I've been testing several aproaches to getting a stable close-packed array of 518 and 617 nm nanospheres at the milipor subphase surface, for a future Langmuir Blodgett implementation. From what...

06 February 2020 8,391 1 View

What are the convergences and differences between critical and creative thinking?

There are different definitions and references for these two types of thinking. However, the research that has been carried out and that is being disseminated common points and, in many cases,...

29 January 2020 2,342 8 View

STS Score - Excel sheet calculator?

I'm looking for an excel sheet to calculate the STS Score. From the website http://riskcalc.sts.org/stswebriskcalc/calculate. Does anyone have a worksheet to calculate the STS Score?

25 January 2021 958 4 View

Correction of co-author information?

Need to change Hossam Kandil picture and affiliation Hossam Kandil Professor of Oral maxillofacial radiology, Cairo University Not Cardiology This is wrong Kindly help me correct the...

02 August 2020 5,203 5 View

What has been going on regarding blood transfusion and heart transplants despite Covid-19?

Heart transplant and blood transfusions are very sensitive whether or not there be any pandemics. How do you think is the pandemic affecting these and how could this be managed, like how blood...

28 May 2020 3,283 9 View

Does a bicuspid valve confer any advantage over a tricuspid valve in terms of fluid dynamics in a human heart?

I've been grappling with this question for a very long time. There must be a logical reason to explain why almost all humans have one bicuspid mitral valve and 3 tricuspid valves in their hearts....

01 February 2020 2,644 1 View

How to calculate the pressure difference at different points between the outlet and inlet of heart chambers from 2D PC MRI velocity data?

I have 2D PC MRI velocity data in a square matrix. I want to calculate the pressure differences at different points between the inlet and outlet of left atrium from this data. I have calculated...

25 January 2020 1,415 2 View

Cardiac rupture following electrocution in birds: is it common?

24 November 2019 9,676 2 View

Are their standardized exercise guidelines and methods for individualization of exercise dose for patients with cancer?

22 November 2019 3,310 9 View

Are their standardized exercise guidelines and methods for individualization of exercise dose for patients with cancer?

10 November 2019 3,148 6 View

The sample size determined in MCDM?

Dear Researchers, There are a lot of techniques like AHP, ANP, DANP etc wherein a group of experts are requested to give their opinions. My specific questions are: 1. How is the sample size...

07 August 2019 8,798 4 View

The sample size determined in MCDM?

Dear Researchers, There are a lot of techniques like AHP, ANP, DANP etc wherein a group of experts are requested to give their opinions. My specific questions are: 1. How is the sample size...

02 August 2019 1,394 3 View