How to find a correlation between coordinates in a curvilinear coordinate system?

Hello. I have a skewed elliptical coordinate system (I use alternative elliptical coordinates). And I need to determine connections between coordinates in order to fetch a covariance matrix of...

28 February 2021 364 3 View

Failed Chromatograms on HPLC-ESI Orbitrap?

Hello fellow researchers, I recently have a problem with an HPLC coupled to an Orbitrap mass analyzer. I usually use some protein mix to make sure the equipment is ready to separate and read...

09 February 2021 3,595 8 View

Do you know any available open-source data on animal behavior for model validation?

In my research related to monitoring the cow behavior with help of sensors I have a permanent and principal problem with the data for model validation. I tried to find some available open-source...

26 December 2020 8,197 2 View

Do you know of research in communication/media studies using "Activity theory" ?

Hello, For a project which studies how teens deal with social media and their interfaces, I'm interested in so-called "activity theory" (also know as cultural-historical activity theory). I know...

21 October 2020 2,364 4 View

Northern blotting advice?

Hi everyone! Does anybody know about a good website or place to get some guidance on Northern blotting? Also, advice on blotting the RNA ladder?

07 October 2020 739 3 View

Did somebody tried to use the attR1 and attR2 sites without the chloranphenicol resistance gene i.e. AttR1-ccdB-AttR2?

I am trying to design a vector as compact as posible to test DNA transcriptional enhancer and/or repressor activity, I already have a compact bacbone (pICOz vector), minimal promoter, translation...

22 August 2020 1,083 1 View

How to amplify phage DNA (dsDNA) for producing restriction profiles?

Hi everybody! I need to amplify phage DNA so as to be able to produce restriction profiles using different restriction endonucleases. Can anyone recommend which primers should I use? I know random...

06 August 2020 1,194 3 View

Is there any method for tuning Subspace Predictive Controllers (SPC)?

My current research is about SPC and I'm interested in tuning strategies for these types of predictive control approaches. The cost function is on the photo and the tuning parameters are Np...

23 July 2020 1,176 1 View

Some TWIP steels are susceptible to hydrogen-induced failure, but adding up to 2% aluminu improves the situation. What mechanisms explain this phenom?

On the role of aluminum in TWIP steels

22 July 2020 5,670 4 View

Do you think the teacher should switch roles with the students while teaching a foreign language through TIC?

There are some theories, as Pelgrum and Law (2003) suggested that it is necessary to make a switch between the teacher and the student roles. I mean, the student should be also the active role in...

15 July 2020 5,169 15 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 model Supercritical water gasification (SCWG) process in Homer software?

Hi everyone How to model Supercritical water gasification (SCWG) process in Homer software?

25 February 2021 4,075 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

How to dissolve cross-linked Amberlite IRC120 H, hydrogen form resin?

Hello all, I have used Amberlite IRC120 H, hydrogen form acidic cation-exchange resin for the ion-exchange of waterglass [sodium silicate solution -- 40% Sodium silicate (mol ratio > 3.2)...

21 February 2021 5,614 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