How can I apply Homotopy Methods to nonlinear Finite Element Analysis?

Homotopy Methods are claimed to solve a system of nonlinear algebraic equations (NAEs) and to find solution of nonlinear PDEs without having to invert Jacobian (tangent stiffness) matrix like...

16 March 2020 4,880 4 View

What are the instruments ( Survey questionnaires) to find out perceptions of teachers towards formative assessment?

I am looking for some instruments (Survey) to investigate teachers' perceptions about formative assessment. What should I ask for my focus group discussion? Thanks.

15 March 2020 6,150 3 View

Dissertation title for Msc in Cybersecurity and management?

I am looking for idea of doing dissertation in cybersecurity and management for Msc. Can someone help me to give the advice on dissertation title and sector and field to research ? Thank you.

25 November 2019 7,657 7 View

GRADE approach, Inconsistency/Heterogeneity domain; Downgrade by 1 level or 2 level?

In assessing the quality of evidence using the GRADE approach, with regards to inconsistency/heterogeneity domain, how to know that I should downgrade the quality of a body of evidence by 1 level...

16 November 2019 6,593 1 View

What kind of ML algorithm will give highest accuracy for Road accident Severity Prediction System?

I'm doing research on Road Accident Severity prediction using a machine learning - Artificial Neural Network. Dataset size will be less than 5000 traffic records. Thanks

17 September 2019 9,407 4 View

My cloning is not working. What could be the problem?

I am trying to clone a fusion PCR product in pcDNA3 vector. After double RE digestion, and direct ligation with the vector, bacteria transformation seems to be working. There is no colonies on the...

14 August 2019 1,332 3 View

Cell numbers in powder increase again after decreasing?

I used the raw substrates for formulation of bacteria for biocontrol. During storage, cell numbers decreased continuously during the first two months. However, it increased again after 2 months?...

24 July 2019 1,054 3 View

How to extract mtDNA from isolated mitochondria?

Is there any kit or protocol we can use to extract mtDNA from isolated mitochondria instead of from tissues or cells? Also considering extraction from inner membrane and matrix fractions.

02 June 2019 9,031 3 View

How to calculate the problem using two way ANOVA by hand?

I am new in learning ANOVA and I just learned one-way ANOVA. In learning two way ANOVA with online tutorials, most of the problem solving questions are separated in group dimension and there is no...

18 May 2019 6,027 2 View

Does VFAs depletion possible when alkalinity increases?

Hello my fellow researchers I am wondering if there is VFAs depletion could possible when the substrate is adjusted pH? what i believe is, in term of pH, it ts highly likely - as increase in...

24 September 2018 7,227 3 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

Standard curve shifting over time. How do I stabilise the ELISA?

24 February 2021 1,365 3 View

How does the injection volume impact LLOQ and ULOQ in regression analysis (LC-MSMS)?

Hello, I have run into an issue that has sparkled a debate at work: is the LLOQ/ULOQ impacted by injection volume under the following circumstances: 1) Same dilution factor of all samples 2)...

23 February 2021 9,159 3 View

Using the Pfaffl method: Is it possible that the ratio of the calibrator does not equal 1?

Hi all, I have a question regarding calculations using the Pfaffl method. I have 3 groups per experiment: 1 control group (calibrator) and 2 treatment groups with 6 to 7 biological repeats per...

19 February 2021 8,351 2 View

How to estimate/know plant virus concentration to make a standard curve in ELISA after serial dilution?

Hello, I am trying to know tomato virus titer/concentration in samples and I will perform serial dilution of the positive control. I wanted to ask How to estimate/know plant virus concentration to...

13 February 2021 6,534 4 View

XRPD Quantification - Building a calibration curve of drug excipient?

I am aiming to utilise XRPD to quantify a drug excipient within a drug product and have been having a little trouble building the calibration curve to allow for this quantification up until this...

10 February 2021 6,145 3 View

Gain and offset values in Sentinel-2 L1C?

Hello everyone. I have been trying to apply radiometric calibration on Sentinel-2 L1C images (bands 2,3,4 and 8), but every time after layerstacking I come across this error: "Calibration...

28 January 2021 7,160 1 View

What is a good software for non-linear curve fitting rather than Excel and Lab Fit?

I am looking for good software for curve fitting. My curve equation is non-linear. I used Lab Fit and Excel software but could not find the curve equation with good accuracy. What software do you...

20 January 2021 5,554 13 View

How can you confirm new liquid FTIR cell fits calibration?

We have an FTIR instrument which was calibrated in transmission/absorption mode using a set of cells for different ranges of D2O concentration. One of the cells at high range broke and the new one...

16 January 2021 4,791 2 View

Standard addition calibration without blank matrix available?

I have a problem of analytical chemistry. We are working on a spectroscopy technique (FTIR) for the quantification of a mineral phase in complex matrices. We intended to use chemometric techniques...

12 January 2021 7,739 1 View