When comparing two very similar surveys taken over time, but with different sample size, what would be the best way to approach this problem?

Hi, I'm currently analysing a survey for a university course design, and some guidance would be very much appreciated. The students who are enrolled in a (year-long) course were given a link to...

08 December 2020 6,624 9 View

When analysing survey using Likert scale, is it okay to use Friedman's test?

Hi, I'm currently analysing a survey for a university course design, and some guidance would be very much appreciated. The students who are enrolled in a course were given a link to participate...

06 December 2020 6,060 2 View

How to use CCDC to find CIF files?

Seems like a silly question but I'm having trouble with searching for CIF files via https://www.ccdc.cam.ac.uk. I've used it before but I was on university campus so I think I was able to use more...

25 March 2020 1,271 3 View

Why do I get variation in ELISA (sandwich) results?

Hello, we have been performing in our lab a validated ELISA test and we are getting a lot of variation in results. We have a std curve with each test and we also include a control sample and we...

02 March 2018 3,014 5 View

Can the result from Zetasizer analysis considered as the size of the nano particle?

11 May 2017 5,099 9 View

What is the process used to coat Ag with PVP? Could one just mix PVP with AgNP in distilled water and shake it?

Appreciate any input

10 January 2017 923 3 View

How to measure magnetic nano particle (iron) grain size without chemical compound?

Since SEM and TEM both have metal probe, I am wondering if there is any other way to measure magnetic nano particle (iron) grain size without chemical compound. I know that XRD could be an option...

12 July 2016 8,071 1 View

Perform classification data mining on attached dataset using Weka to build model that could be used to predict lateness?

Please help!!! I am new to Weka, and have to do a project for school regarding classification. Is there anyone familiar with Weka that would be willing to point me in the right direction? Thank...

19 April 2016 4,144 2 View

What is the influence of fluid leakages on vortex generation inside the diffuser of a pump tested in air?

When a pump is tested in air, fluid leakages are entering inside the pump through the gap betwen the impeller and the diffuser for some flowrates. These fluid leakages can significally modify the...

20 February 2016 4,696 3 View

Is there a trick to get a confluent cellular surface?

26 July 2015 3,009 6 View

What are the countries most affected by extreme rainfall as a result of climate change?

Increased heat, drought and insect outbreaks, all associated to climate change, have increased wildfires. Decreasing water supplies, declined agricultural yields, health impacts in cities owing to...

01 March 2021 7,168 9 View

What is recommended for solid domain in ANSYS FLUENT?

Should I mesh the solid domain ? or should I use wall thickness? or Shell conduction? for Heat Transfer between two fluids of a Heat Exchanger. what is recommended?

01 March 2021 9,785 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

How can i resolve the "final solutuin is not converged" error in Comsol for my heat transfer simulation??

I have been trying to simulate heat transfer problem in Comsol 5.5 for long time but it always throw an error stating: "Failed to find a solution. Maximum number of Newton iterations...

28 February 2021 8,626 3 View

Exit velocity of natural gas from pressurized tank?

Hi Guys. I'm a mechanical engineer and have a bit trouble, would be very glad if you could help me with my questions. I have a pressurized tank which contains Natural Gas at 200 Bar and 293...

26 February 2021 6,253 3 View

Anyone that can help with Maxquant TMT16plex which is missing?

Hi I am very new to proteomics analysis. I have got raw files from core facility running thermofisher TMT 16plex 4 hours. I cannot find on maxquant the option TMT16Plex there is only up to 11...

25 February 2021 1,675 3 View

How to properly calculate the fluid solid heat transfer between polypropylene matrix and glass fiber in a porous medium?

I'm building a cfx model of thermoplastic pultrusion process on ansys and i have a doubt on how is the proper way to set this parameter in a porous medium

24 February 2021 1,915 1 View

How to properly calculate Interfacial area density in a porous domain?which are possible value for glass fiber?

I'm doing a cfx simulation of a multiphase flow in pultrusion and i set the Interfacial Area density in the heat exchange of a porous medium in this way IAD=Total fiber lateral surface of fiber...

23 February 2021 6,043 1 View

Model Volume fraction and magnetic field applications of nanofluids in ANSYS?

Hi I am working recently on a project where I have to study how the thermal properties or heat transfer enhancement of nanofluids as the volume fraction changes, or if a magnetic field is applied...

22 February 2021 961 2 View

Help with assigning pressure boundary conditions in FLUENT on a large structure?

Hello, I created a very tall tower (>1000m) and applied pressure boundary conditions at the inlet (bottom) and outlet (top) that correspond to the pressure are their relative altitudes....

22 February 2021 9,972 4 View