How to measure the viscosity or concentration of a polymer solution?

I need a device that can detect either viscosity or concentration of a polymer solution used in mass production, which excludes many approaches appropriate only for lab experiments. If possible, I...

09 October 2019 1,706 5 View

How to remove the papers I'm not entitled to have, by mistake?

I don't know by whose fault, I was claimed one of the authors of many papers I'm not entitled to have. I don't know how to remove those papers either. For example, how on earth do I have papers...

04 May 2019 9,894 2 View

Nobody has never found a way that is comparable or better than the Sloot Digital Coding System"?

The Sloot Digital Coding System, a lost invention, believe to be a revolutionary data coding system, which only requires 8KB of data to store a full movie! However, giving that "the principle is...

09 October 2017 927 0 View

How to characterize residual monomer content in polymer blends?

After polymerization, there are always a small amount of monomers left either in the polymer matrix or other materials that are dispersed in the polymer. This is very undesirable, as residual...

09 October 2016 8,988 8 View

Did Bertand Russel indeed said that certain branches of science existed to suppress the development in certain area?

05 June 2016 4,246 1 View

Can anybody give a list of polymers that can be dissoved in liquid crystals?

I want polymers be directly dissolved in liquid crystals (no polymerization involved). Any ideas?

04 May 2016 6,709 4 View

Does compressing smectic layer multiply defects?

Compressing solid materials multiplys instead of reducing defects? How about smectic liquid crystals?

02 March 2016 7,024 2 View

What's the current view of lack of or weak higher-order x-ray diffraciton of smectic-A?

Smectic-A has a very peculiar feature in x-ray diffraction. The higher-order x-ray diffraction is either absent or very weak. This might be easy for people who have followed the progress on this....

02 March 2016 1,913 0 View

Why can the tilt angle of smectic-C not be bigger than 45 degrees?

As far as I know, the largest tilt angle achieved is about 30 degrees. Consider two rode-like neighboring molecules, with no-uniform charge distribution (of course, overall the molecules are...

01 February 2016 5,853 1 View

How to make interpenetrating polymer networks?

I'd like to make interwoven polymer networks.

01 February 2016 5,273 3 View

How to normalise data on OPM package from R Studio ?

Good afternoon, I recently used OmniLog from BIOLOG for my experimentations : I tested the metabolism of different strains on 2 types of plates. I have 16 strains of 3 different groups...

02 March 2021 3,584 1 View

How to plot the probability paper of Gumbel distribution using R programing?

In R-studio, there are many commands of Gumbel package. Arguments are also different. I`m asking about the alpha parameter of the Copula which must be greater than 1. If this is the one used to...

25 February 2021 5,229 3 View

Bayesian decision trees and bayesian regression trees in Python and/or R?

I am looking for implementation of bayesian decision trees and bayesian regression trees in Python and/or R.. Do you know if the existing libraries support this

23 February 2021 6,689 3 View

Can't recognize exact phase and PDF card no of Silicon carbide in XRD?

We have deposited silicon carbide on carbon substrate using one PVD technique. Due to amorphous behavior of SiC at low deposition temperature, we performed heat treatment of those films at...

22 February 2021 2,072 3 View

Are there packages (R or Python) for simple models (bucket?) to assess soil water content?

Hi everyone. I am researching droguht effects on soil water drought. I am looking for already implemented functions in R or Python to estimate soil water content from precipitation,...

21 February 2021 2,084 1 View

ANCOVA controlling baseline in RCT - how to perform power analysis and sample size estimation?

Hi, I have a simple question. I am hoping to perform a power analysis/sample size estimation for an RCT. We will be controlling for baseline symptoms, and using post-treatment or change scores as...

19 February 2021 2,648 23 View

MVN, how to conciliate contradictory results from Multivariate normality and Multivariate outliers test?

Dear colleagues, I'm working with Path analyses in lavaan and MVN packages. There are some results that for me are confusing and features from the MVN that I do not know how to set. My dataset is...

18 February 2021 190 3 View

How to get better phase shift in C-V curves for ferroelectric devices?

I tried to sweep my ferroelectric devices from -2V to 2V and then from 2V to -2V and The two hysteresis peaks are off by several microFarads. Should i increase bias voltage? I am doing these...

16 February 2021 8,514 2 View

Would you please recommend a function in R software that could be used with FUNGuild output to merge different rows that have similar guilds?

Dear colleagues, I have an output of FUNGuild tool (ASVs abundance in different samples and assigned to guilds) and would like to merge the ASVs that had similar ecological guilds using R...

16 February 2021 4,292 7 View

How to remove the species data from rda data frame in R (only remain the sites/samples point)?

Dear everyone, When I using the rda function in r, I met this question. As you can see in the figure, there are a lot of deep blue points which refers to the species. But I would like remain...

15 February 2021 8,982 2 View