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

How the annotations of MIT-BIH Arrhythmia Database can be viewed in MATLAB?

Basically i want all classes of arrhythmia in single .mat file with proper labels. What should i do?

09 February 2021 8,062 2 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

ECG dataset in JPG or any other image format?

Where I can find ECG dataset in JPG format containing normal and arrhythmia images? Famous datasets like MIT-BIH Arrhythmia Dataset and PTB Diagnostic ECG Database does not contain image data. I...

05 November 2020 774 4 View

How can i plot large data sets in SVM and show a comparison with other kernels SVM ?

I am working on ECG arrhythmia classification by using SVM , implemented some kernels tricks and using different kernels on MIT BIH dataset (features create 44187 row ,18 column matrix) now it...

04 November 2020 3,602 4 View

How to simulate repeated impact load in abaqus?

Why, when I did the modeling, the result of the analysis give an increase in the value of impact force in the subsequent strokes while it was supposed to decrease.

31 August 2020 1,531 2 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

Sample size calculation based on hospital population?

hi, if we are doing a single centered study, can we estimate/calculate sample size based on patients in that hospital? e.g i want to conduct a research on stroke patients. so my population will...

22 June 2020 5,217 5 View

Which formula to use to calculate the sample size for a cross sectional comparative study?

If i intend to carry out a cross sectional comparative study (analytical study design) to assess the association of cardiac diseases among young stroke patients, where do I begin? Do I enroll...

07 June 2020 5,505 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