How far and how long the world will combat against mutants of SARS-COV-2 ?

Anxiety is something which happened before any situation and Depression is that which happened after any situation. Up to what extent it is true?

Waiting your response. Do you agree with it?

1. Relativists have tried to exorcise the paradox by all means ("acceleration" and others), but their arguments are obviously bad.

2. There is no universal (Newton's) time in the theory of relativity. There is your time at your place and my time at your place; there is your time at my place and my time at my place, and so forth. There is no one Time; hence, the debate about who is "younger" and who is "older" is baseless and incoherent. I consider the entire discourse about the relativity of time meaningless and useless; but a discourse about twins paradox is especially bad.

I want to create an ester by using benzoic acid and benzyl bromide, but not able to decide which catalyst and solvent will be appropriate for this ester formation reaction.

copper extraction from CuFe2O4 and or Delafossite CuFeO2

I am facing an issue when calculating the dielectric function of Aluminum doped zinc oxide.

I am trying to replicate a paper and the imaginary part of the dielectric function is correct like in the paper I am trying to validate.

However , the real part of the dielectric function at the low energy region (0 to 0.5) should be negative, I am obtaining positive values, it seems that this part is reversed for some reason.

The rest of the real part data is correct.

I am using GGA- PBE- Norm conserving ultrasoft pseudo potentials.

I am really confused as I checked the documentation and it seems that the real part is calculated from the imaginary part, so how come I am getting these reversed values if the imaginary part is correct?

Thank you so much in advance.

Dear all,

I am doing my master thesis regarding waste management behaviours. The variables are as follows:

DV = waste management behaviours, Ordinal

IV = People's perception on waste (there are 4 IVs in total), Ordinal

Moderating variable= socio demographic factors (5 MVs in total), Nominal

I did regression analysis for DV and 4 IVs. I would like to know which process should I do in stata to test whether demographic factors can moderate the relationship of DV and IV. Thanks in advance. Have a nice day.

Hsu

I want to ask the question regarding the approach to solving the combinatorial optimization problem (COP). Based on my reading, some of the researchers proposed an Exact approach to solve the COP rather than a Heuristic approach. As known, the exact approach may not suitable to solve real-world COP on a large scale due to the computational time to provide the solution. But the Heuristic approach can provide the solution with the relational computational time near to the optimal solution. My question why the Exact approach still becomes the choice for some of the researchers rather than directly using the Heuristic approach? Thank you.