How can I calculate the diffusion of water in a sphere (radial diffusion)?

I am measuring the moisture absorption of PET granules by measuring the mass over time. Is it possible to approximate numerically the integrated Fick's law (mass vs time) for the case of the sphere?

22 December 2020 6,359 3 View

Is it possible to fix the intercept in a linear model (lm() in R)?

Dear all, I believe this should be a simple question but after trying and reading I still have no solutions. Basically what I want to do is to run a linear model in R fixing the intercept to a...

26 November 2020 6,897 6 View

Which non-parametric equivalent to the two way ANOVA can be used?

Dear colleagues, I am looking for a non-parametric alternative to the two-way ANOVA as my data are not normally distributed (variances are homogeneous). Friedman test is not a good option as my...

28 September 2020 9,857 11 View

Is it possible to calculate diffusion coefficient through a porous thin film using mass and time?

Hello, I have some porous coating on a hygroscopic substrate. I am measuring the mass change over time of samples left in water. The samples were previously dried. Is it possible to derive from...

09 September 2020 8,818 3 View

Molecular SET-based circuit simulation tools?

Hi! Are there any simulation tool for digital circuits based on Single Electron Transistor (SET) where the dot is single molecule? Is SIMON simulator technology dependent? Thank you

29 May 2020 1,493 3 View

How to properly set k-points in atomistic transport calculations?

Hi I'm interested in analyzing transport in nanodevices. I don't clearly understand how to properly set the number of k-points sampling in transmission spectrum computations. Is it possible, given...

09 March 2020 1,327 4 View

How can I dry an aqueous suspension of polymer nanoparticles?

Can I try to use vacuum oven to obtain a powder that I can then redisperse? Thanks

18 February 2020 3,802 2 View

Why can't I get bands after SDS PAGE?

Hello everyone. I run a SDS PAGE on wheat anthers for my fist time, and I have got this outcome (see annex). In the first line (left to right), I loaded 10ul of ladder ( Spectra Multicolor Broad...

08 October 2019 7,439 8 View

Colour of PVP in water?

I have prepared a solution of PVP (Mw=10k) in distilled water. After sonication for 30 min and 1 day of stirring, the colour of the solution is brownish. Is It correct? Thanks.

05 December 2018 6,804 1 View

Lipid doplets quantification. Cell Profiler or ImageJ methods?

Hello everyone, could someone suggest me a method for the quantification of Lipid droplets Nile Red stained? I attach here some representative pictures. I would appreciate a lot if you can provide...

29 October 2018 7,391 1 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

What is your perception on using visual analysis or quantitative approaches to evaluate data from single-case research designs (n of 1 trials)?

Results of single-case research designs (i.e., n-of-1 trials) are often evaluated by visually inspecting the time-series graph and computing quantitative indices. A question our research team is...

03 March 2021 687 1 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

1. What is the impact of having different scales in a survey? and how can we solve this problem before and after data collection (Literature)?

1. What is the impact of having different scales in a survey? and how can we solve this problem before and after data collection (Literature-based reflection)? Thank you for your time and for...

03 March 2021 2,870 3 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View