Cross-country research: How can I control for the factor country, although I don't have any hypotheses regarding country differences?

Hello, I am currently preparing a preregistered report for experiments in different countries. I am studying motivations/values of students; therefore, I want to conduct several same experiments...

28 January 2021 5,763 3 View

How best can one separate n-hexane-soluble fraction of plant extract that binds strongly to silica gel columns and what are the possible compounds?

I wanted to elute n-hexane-soluble fraction of a plant extract in a silica gel column using different proportions of dichloromethane/n-hexane. The bands separated visibly initially but moved only...

18 January 2021 9,270 3 View

DIANA FEA 10.2: How do I model deformation supports, so that no tension occurs/is allowed ?

Hello together, I am working on concrete direct shear Tests, where i apply loadsteps of a prescribed Deformation (left deformation). Since i can only apply a Deformation with a support inplace i...

20 January 2020 8,225 3 View

Is HSE06 a good functional?

I'm investigating first row transition metal oxides on diamond surface, optimizing structures and calculating electronic properties (e.g. electron affinity). I was advised that since I'm working...

08 January 2020 8,713 4 View

Quick ('on the Fly') update of MM potentials, MD software with Amber ForceField?

Hello, Could anyone recommend a free MD software (that takes Amber ForceFields) where one can very quickly (on the Fly) update the MM potentials of a set of atoms (and query the coordinates of...

20 November 2019 7,716 1 View

What test shall I use when I want to compare an experimental group at various time points to one control group?

The data are as follows (overview of the design attached): One parameter was measured in the blood of the same patients at various time points and also in a healthy control group at one time point...

15 July 2019 1,382 6 View

Can I use ELISA with not ideal standard curve?

Dear colleagues, I would like to ask you if you have any experience how to use data from ELISA analysis when my standard curve is not as showed in the manual? I have many standard curves that have...

17 April 2019 282 4 View

Does it exist any open repositories of user stories?

For a Machine Learning-based project, I'm looking for repositories containing user stories (and acceptance criteria). This can be issue management systems (e.g., stories in Jira) or plain...

19 December 2018 4,195 7 View

What are possible portable multigas sensing devices?

Hi, I'm currently looking for a portable gas measurement system to measure O3, NO2 and CO at the same time. I already stumbled upon GrayWolf Sense and Aeroqual. Can someone suggest other...

13 September 2018 6,690 2 View

Is it possible to see a statistic regarding the amount of publications in year x with topic y?

Hallo, in the context of my master thesis I would like to point out that the publications in the area of the topic blockchain in supplychain management have increased enormously in the last two...

19 August 2018 9,225 3 View

Why can't make aluminum nitride film successfully by use sputter?

We use reactive sputtering process to make aluminum nitride film, and want to make c-axis aluminum nitride film on a silicon substrate, but the crystal orientation cannot be seen with...

03 March 2021 7,975 3 View

Heat exchanger with liquid Nitrogen as coolant?

I want to cool Natural Gas from 195 Kelvin to 138 Klevin in a heat exchanger by using liquid nitrogen as the coolant medium. When entering the heat exchanger, the liquid nitrogen will have a...

01 March 2021 6,450 5 View

Why do a weight decrease for thermal degradation in nitrogen gas condition?

Hi all The question is related to TGA(Thermogravimetric analysis). Thermal degradation easily understood but why do samples weight decrease? altough just binding is broked, the weight of...

26 February 2021 1,100 5 View

Steps to calculate activation energy by coats & redfern method?

I'm a chemistry student and I'm researching the kinetic degradation of mixed plastic waste. I'm having trouble calculating the activation energy by the coats & Redfern method. The data that...

24 February 2021 974 1 View

How to generate AA6061 alloy or any aluminium alloy crystal in material studio?

I need to carry out molecular dynamics simulation on Aluminium alloy. For this i need the crystal structure that which could be further replicated to form a structure.

22 February 2021 1,410 1 View

How to get/count refractive index in gasses?

20 February 2021 8,202 6 View

How much costs direct reduction of nitrogen on farmland in terms of lower crop yield?

Dear research fellows, I wonder if someone knows how much direct reduction of nitrogen on farmland costs in terms of lower crop yield expressed as EUR/kg nitrogen (or similar)? I understand that...

15 February 2021 1,323 3 View

Are there alternatives to the Devarda alloy when estimating nitrogen?

Are there alternatives to the Devarda alloy when estimating nitrogen? devarda alloy is reducing the nitrate to ammonium

15 February 2021 8,838 3 View

About XRD details of pristine and doped RGO?

Hi Can anyone please help me know the XRD details of reduced graphene oxide, Nitrogen doped reduced graphene oxide, Sulphur doped reduced graphene oxide, Nitrogen and Sulphur co-doped reduced...

08 February 2021 3,033 3 View

How to make Fast Green FCF from powder?

Hi everyone We need Fast Green to electroporate plasmid into mice embryos, therefore we simply need it to see some color in the liquid we are electroporating so that electroporation is more...

07 February 2021 1,671 2 View