Calculate sample size for diagnostic tests?

What sample size formula should I use to compare the three area under the roc curve (AUC) obtained from three diagnostic methods from similar sample? MedCalc software gives us the sample...

20 December 2020 5,635 3 View

Dose any-one knows about cleaning validation for pathogens from fermentor?

Hi Dose any-one knows about cleaning validation protocols for pathogen-bacteria from fermentor? In industerial size, 1000 lit?

15 December 2020 4,418 3 View

How can I model mechanical properties of a material using Von Misses-Hill model in Abaqus?

Hello everyone; I am trying to simulate a stent which is made of stainless steel in abaqus and in addition to the elastic properties that are defined by Young's modulus and Poisson's ratio I need...

15 September 2020 1,809 4 View

How can we calculate the concentration of 1000 tons of carbon dioxide in the air in PPM?

Dear All scientists; How can we calculate the concentration of CO2 emitted in the air in PPM? shall we use PPMv(Volume PPM) or Mass PPM is also acceptable? Regards

01 August 2019 7,464 4 View

How can I recall a modified citation style in Mendeley with the name I entered?

When I save as a modified style and change its name, the new style does not show up with the name I have entered for in the styles list. In stead, a general title like "APA-Saeideh" is built...

20 May 2019 6,622 6 View

How can implement print screen key action in c# ?

We can implement for example enter key in c# by SendKey.Send( {"ENTER"}) code. but this method didn't have option for print screen key (reserved for future use ). how can I implement it? My...

29 January 2019 6,161 1 View

How do you control the cancer?

25 October 2018 7,240 3 View

Economic evaluation modeling based on secondary data; which of the following approaches is accurate?

I need to run an economic evaluation model of 6 drugs based on secondary data of a network meta-analysis study which has covered 21 drugs. This study also has reported separate pairwise head to...

03 September 2018 3,174 1 View

Can I run GEE having two within factor variables?

I have one factor as time (3 time points) and the other as treatment( absorbable versus nonabsorbable Sutures that each of them were used on different sides of a scar) so two treatments had been...

08 June 2018 6,220 1 View

How can I make a teeth whitener in the chemistry lab?

How can I make a teeth whitener in the chemistry lab?

02 June 2018 6,306 3 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 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

How Relativistic effects is one reason for lanthanide contraction?

The Lanthanide contraction which is the decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, is due to poor shielding of the 4f...

01 March 2021 2,272 4 View

Ester cleavage conditions?

Hi all, I need to cleave the ester in Ethyl 2-amino-1H-imidazole-5-carboxylate to make the carboxylic acid and retrieve the product from solution to use in downstream applications of linking to...

01 March 2021 8,766 3 View

How Can I bring as much common elements in steel as possible to calculate stable phase(s) in OpenCalphad?

As I was tweaking step-by-step OpenCalphad6 Macros step1.ocm involving phase and thermal property calculation of a High-speed steel, I could not incorporate more than 6 elements in the steel...

01 March 2021 8,840 1 View

What is the error of the Txy diagram?

Hi, I know the attached Txy diagram has an error but can't figure it out. Could you please look at the diagrams and explain it to me?

23 February 2021 4,239 1 View

I am looking for a simple software program to model 3D chemical bonds. The purpose is to generate high-quality graphical abstracts. Any suggestion?

Hello everyone: I am looking for a simple software program to model chemical bonds. The purpose is to generate a high-quality graphical abstract for a top leading journal in the field of...

23 February 2021 8,012 3 View

How the values of errors can be calculated for thermodynamic data?

I have calculated thermodynamic parameters for surfactant solutions in aqueous and mixed alcoholic solvents. I want to calculate the value of errors in the data and represent it in the table along...

22 February 2021 239 2 View