T-test and Mann-Whitney U test on groups with different sample sizes and variances?

Hello I have 2 groups with different sample sizes of (experts: 5 to 8) and (Users: 28 to 35) answering 21 questions on a 7 points Likert scale about the importance of some dimensions for...

31 January 2021 3,885 7 View

What are the types of optimization problems that can't be tackled by meta-heuristic and heuristic algorithms?

Any decision-making problem when precisely formulated within the framework of mathematics is posed as an optimization problem. There are so many ways, in fact, I think infinitely many ways one can...

06 September 2020 9,415 14 View

Is it possible to reduce tensile strength and increase compressive strength by adding any admixture to concrete?

Hello, I want to know is it possible that the compressive strength of concrete increase by reducing tensile strength? if yes, how we can explanation and justification this issue?

30 April 2020 4,489 7 View

What are the plans for exams and assessments of universities during corona virus pandemy?

What alternative ways universities use for academic assesment of students?

29 April 2020 3,091 1 View

Is there a specific way to discretize a continuous model to any arbitrary multi DOF system and extract the mode shape matrix in abaqus?

27 April 2020 239 3 View

What is best sampling method for cross sectional studies?

I want to research on liver disease patients behaviours and habits in shiraz city. How can I calculate sample size accurately? Thanks

23 March 2020 9,974 5 View

Anyone in kolkata working of LNCaP prostate cells?

I am working with prostate cancer cells, i want to know who is presently working with PCa cell lines in viro and in vivo in kolkata.any leeds will of great help.

07 March 2020 7,831 1 View

How can I find the IDT point of the following TGA curve which is related to a clay soil?

The attached file shows the TGA curve of a clay soil. Can anyone help me how to recognize the initial decomposition temperature (IDT) from this curve?

06 February 2020 6,944 3 View

How to isolate dorsal root ganglia in rat at lumber region?

For pathological investigation of sensory and motor nerves in lumber region of rat how to isolate and preserve

04 November 2019 8,974 1 View

What's the procedure for validation test of a new design of product (Say Heat Exchanger)?

after 3D design of all components of the Heat Exchanger geometry we do assembly and finalization of the geometry, in CFD analysis we change the boundary conditions and it refers us to the...

27 October 2019 9,095 3 View

How can I measure the surface interaction or surface interfacial chemistry between polishing abrasives and upper surface of substrate ?

I am working on polishing abrasives. I need to do few characterizations ? which can provide the on time surface chemistry of substrate with polishing abrasive during optical polishing. I would...

18 February 2021 5,319 3 View

How to get rough estimation of the concentrations of Oxygen and moisture inside the glove box?

Dear colleagues, I was just wondering if you can suggest a good method to get a rough estimation to the concentration of O2 and H2O inside the glove box as unfortunately, our glove box doesn't...

17 February 2021 1,012 3 View

What is the optimal method to prepare a controlled porosity osmotic pump (CPOP) tablet for scanning electron microscopy?

In order to assess the shape and size of pores formed by dissolving the pore former in the semipermeable membrane structure, SEM images are needed. Cellulose acetate was used in the coating...

15 February 2021 6,135 3 View

Is it reliable to evaluate surface roughness (gwyddion) with SEM pictures?

There are a few works(e.g. DOI 10.1002/sia.4889) reporting that surface roughness can be evaluated by software like gwyddion with SEM pictures.However,the surface roughness is strongly influenced...

09 February 2021 1,905 8 View

Is it possible to find out the wettability and contact angle of water on the rough or corrugated substrate?

First of all, whether it is possible to identify the presence of water and its amount on the Silicon substrate by using only FT-IR spectroscopy. Can ATR-FTIR spectroscopy find out the wettability...

03 February 2021 9,085 4 View

Can you polarize Jurkat cells into different T helper subsets?

I am wondering if anyone has had success with in vitro polarization (via cytokines) of Jurkat cells. My goal is to understand the affect of a drug on Treg induction and differentiation. I...

12 January 2021 3,606 2 View

What is the effect of polarization of unit elements in an IRS, if its built for mmWave application?

I usually don't see path loss models for IRS consider polarization. But specific to mmWave application, the polarization of the antenna has some effect. Is there any research that has explored this?

08 January 2021 3,054 1 View

Among all the environmental pollutants globally how much % out of 100% is due to chemists?

Environmental pollutants and hazardous are major issues through which the modern world is suffering. Among all the environmental pollutants and hazardous materials how much contribution is from...

31 December 2020 6,039 3 View

Among All the environmental pollutants how much % out of 100% are due to chemists?

Environmental pollutants and hazardous are major issues through which the modern world. Among all the environmental pollutants and hazardous materials how much contribution is from chemists (out...

31 December 2020 833 7 View

Can we measure porosity of a composite by DSC (heat flow measurements)?

In the DSC conducted for A and B (image provided). B is a derivative of A. Can I conclude that the porosity of composite B is more than A, Since the heat flow is decreasing with increase in...

26 December 2020 9,104 3 View