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

Physical-chemical formation of stalactites/stalagmites. what promotes the formation/growth of these structures?

I know, or think I do, the basic idea behind these natural structures, as from what I know they form due to water dripping from the top leaving a salt deposit behind. But started to wonder about...

22 February 2021 1,400 4 View

Is there an ideal incubation time of RGO-modified SPCE before subsequent use, i.e., electrochemical characterization or further modification?

I notice that upon washing and air-drying of my RGO/SPCE surface and characterizing again via DPV, the current response towards ferricyanide probe significantly decreases. My worry is that the...

22 February 2021 5,324 3 View

How to do a surface treatment of uncoated TiO2 with polymer?

Basically, I would like to know how to treat or coat on the uncoated bare TiO2 (Ti-OH rich) surface with polymer which has anchoring groups in the polymer structure like trimethoxygroups. What is...

21 February 2021 4,657 6 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

Unusually Busy Raman Background?

Hello, I am observing a nearly periodic background spectrum for a wide variety of SERS substrates. I see this response (attached below) for bare Au films, Cu films, and Au nanoparticles on...

15 February 2021 9,922 5 View

How to detect uv vis spectrum of nanoparticle under 300nm?

I try to make the indium nanoparticle and check the uv vis spectrum. I heard that In nanoparticle has surface plasmon resonance peak at 200~300nm. But most of solvent has absorption peak under...

14 February 2021 6,950 15 View

How can I prevent bubbles from forming under a coverslip?

My colleague and I are having some trouble mounting 70 micrometer mouse brain slices. When we initially position the coverslip over the mounted slices, there are no bubbles but when we come back...

10 February 2021 3,580 1 View

Which is the best silane for making a borosilicate glass surface hydrophobic permanently? and what is the protocol?

Regarding my needs I am looking for a glass coating agent that makes the glass hydrophobic permanently

09 February 2021 3,924 5 View

What is the difference between Graphene Oxide and Expanded Graphite?

What are the main differences between Graphene Oxide and Expanded graphite, in terms of surface functionalities, conductivity, d-spacing and other features? Is the term expanded graphite...

06 February 2021 9,810 4 View

Will it be possible to get IC:50 if we target cancer cell line with antibody drug conjugate (ADC) that have 50% less antigen positive cells ?

Is it possible to attain IC50 if my target cells have less than 50% antigen expression ? For example: Cancer cell line XXX is showing 35% of expression of cell surface antigen YYYY, if i...

04 February 2021 2,711 3 View