Structure of the residual covariance matrix in a model with multilevel within-subject factors?

Hello, I have a dataset with a three-level structure. Participants reported an outcome of interest for 3-4 aspects of an incident, and they reported 4 types of incidents (1 incident for each...

09 February 2021 4,280 3 View

Mental health of COVID-19 Patients?

We want to conduct a study on the mental health and psychological problems in COVID-19 patients and would measure it in terms of Anxiety by Beck Anxiety Inventory, Depression by Patient Health...

02 February 2021 6,401 6 View

Which are the appropriate solvents for n-hexane plant extract for in vivo animal models to avoid toxicity?n-hexane plant extract is not soluble?

My n hexane plant extract is not soluble in any solvent. I have tried water, normal saline, tween 20 (2%, 5%, 10%, 50%), tween 80 (2%, 5%, 10%, 50%), pure DMSO, ethanol (2%, 5%, 10%, 50%, 97%),...

16 January 2021 3,547 3 View

Two antennas at transmitter and receiver both. How to limit signals such that each antenna at receiver get signal from only one antenna?

If I have two antennas at transmitter called T1 and T2 and signals are simultaneously transmitted from both antennas at same frequency towards two antennas at the receiver called r1 and r2. Is it...

16 January 2021 4,765 3 View

How much Morphine Standard is dire need for determination and extraction of Morphine in HPLC technique?

I want to purchase some Morphine Standard for HPLC to detect Morphine rate in Papaver somniferum L. how much is need in every stage or phase?

08 January 2021 1,675 3 View

How the year 2021 can be made good for global community?

Many steps can be taken to make the year 2021 good for humanity. For instance, if powerful and rich countries decide and spend some part of their resources for the improvement and betterment of...

30 December 2020 830 4 View

What was the most worst thing and what was the most beneficial thing that happened for global community in 2020?

Many bad and good things happened for global community in 2020. However, the present question is about one top most worst thing and one top most good thing that happened in the world in 2020 and...

30 December 2020 6,262 3 View

What can happen in the world if large scale melting of continental and alpine glaciers occurs?

Several environmental experts have warned about the global warming and its effects on different ecosystems. It may also cause large scale melting of continental and alpine glaciers. If this...

23 December 2020 4,630 3 View

Is there any relationship/correaltion between 1) elastic modulus and adhesion or 2) elastic modulus and density of solid material or polymers?

21 December 2020 1,853 3 View

What are the pros and cons of the Non-orthogonal multiple access (NOMA) scheme on Future Communication Networks?

21 December 2020 9,650 3 View

Buffer Exchange using column packed with sephadex G-25 effect on protein concentration?

Hello, If i am doing a buffer exchange for an antibody of 1mg/mL, does the elution lose protein in the process of buffer exchange? For example, if i flow through 500 uL of 1mg/mL sample, and...

03 March 2021 6,299 3 View

No title

03 March 2021 5,360 2 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View

Why Austenite grains in steel show much more twinning than ferrite grains?

It is oftentimes said to be a distinctive metallographic trait that differentiates a fully austenitic and a fully felly ferritic steel without etching that might distinguish between two. Why...

02 March 2021 728 2 View

Joint behaviour in Abaqus is not captured well?

I am working on roof joint and trying to simulate the behaviour in Abaqus. I am successful in running the model but the final graph does not follow the experimental curve in the negative direction...

01 March 2021 6,661 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

I need to accelerate corrosion in steel parts that are used in a salt-water environment. Is there a technique for doing so?

I have a structure that employs d-ring swiveling tie-downs that corrode during use and become "frozen". I have sample swivel assemblies that I wish to corrode to see if I can free them using one...

01 March 2021 3,739 3 View

How to modify Johnson cook equation in ABAQUS?

I wanted to add an extra parameter to the existing Johnson cook equation in the ABAQUS simulation. How to add those extra parameters. Ref: A modified Johnson-Cook material model with strain...

28 February 2021 4,841 3 View

How can we simulate an hyperelastic-viscoelastic behavor with Ansys APDL?

I am working on modeling and simulation of biomecanical material behaviour, I have succeded on simulating skin using anisotropic hyperelastic material, on APDL and in our lab's finite element...

28 February 2021 552 3 View