I have an anomaly peak on the graph current against time for the vanadiume elektrolite, wath is it?

Hello. Help me please. We have done a first charge of the vanadium electrolyte, we has a vanadium 4+ in 2.5 M H2SO4 and 6M HCl as catholyte and anolite. We charged catholyte for the 5+ and anolyte...

14 April 2020 7,399 2 View

Simple sandy beach dynamics model?

Hello! Please help to find a simple cross-shore sandy beach evolution (erosion+accretion) model for using in day-week scale (i had initial and intermediate profiles (once at month), and 3 hr...

26 June 2019 4,903 2 View

How to choose post hoc test for between-subject factor in Mixed ANOVA?

I use Two-Way Mixed ANOVA with 3 levels of between-subjects factor. I have no significant interaction, so I won't testing pairwise comparisons for one factor within each level of other factor. I...

26 April 2019 8,057 6 View

How to extend half-life of peptide?

We have peptide with improved stability and resistance to peptidases, but we have problem with excretion.. our drug excreted from blood about several minutes after intravenous injection. What...

10 December 2018 6,671 3 View

What is the relationship between two techniques of symmetry group seeking?

What is the relationship between symmetry groups of differential equations like in works P. Olver, L. Ovsyannikov, P. Winternitz and kinematical invariance groups like in works U. Niederer, C....

28 December 2017 4,783 9 View

Could anyone recommend a software for schematic illustration of nanocomposite structure?

Could anyone recommend a software for the creation of such kind of illustration (see the attached figure)?

04 April 2017 6,013 2 View

Can someone provide advice on SEM?

I am a Ph.D. candidate (Information Systems) and a beginner in statistics and SEM. I have several questions in regard to my SEM model and analysis for my dissertation study and would appreciate...

05 January 2014 2,895 21 View

Could you recommend any books about Number Theory?

Beginner level books. High level books. Analytical Number Theory. Algebraic Number Theory. Combinatorical Number Theory. Books about partitions. Books about primes.

03 March 2021 7,174 5 View

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 View

What is Flat Lens Antenna?

28 February 2021 5,433 3 View

Can impedance of antenna be less than 50 ohms?

I am simulating helix antenna in hfss, right now, giving excitation with 50 ohms port. When I see the results of Z parameter (real). It shows lower than 50 ohms. Do not understand, if it can be...

27 February 2021 4,218 7 View

What are the application of Fixed points thoery in Chemistry.?

It is said that fixed point theory has lot of applications not in the field of mathematics only but also in various areas. So I am looking for applications in Chemistry only..

26 February 2021 3,533 1 View

How to interpolate from a time-series database ?

Hi, I am having trouble with a problem, in the field of Optimal Control and the generation of optimal time-series. Let's consider a system, whose dynamics are represented by dx/dt =...

24 February 2021 9,105 2 View

How to constrain genetic algorithm input u?

My real system (buck converter) can only take an input of 0 to 1 (duty ratio) and I need to constrain the system so the controller action keeps within this bounds. How can I do this? The code for...

22 February 2021 2,125 3 View

Helix antenna coupling problem?

Dealing with a helix antenna, made with flexible material and not rigid like using a PCB board or wire. At the beginning of the helix is too close to the ground plane, causing coupling. How can I...

21 February 2021 4,453 3 View

How to calculate the Atomic Polar Tensor using DFT ?

Dear friends, I am a beginner at DFT calculation. I have done a structure optimization using DFT- B3LYP/6-31G*, Nevertheless, I don't know How to calculate the Atomic Polar Tensor (APT) in...

17 February 2021 9,082 3 View

How can we determine the positive definiteness of multivariable polyomial? Is there any MATLAB function available for that?

Can we check the positive definiteness of a multivariable polynomial using MATLAB functions? Of course in literature, there are few complex methods that use tensor algebra. However, before going...

16 February 2021 1,218 3 View