Is geopolymer concrete porous?

Did you investigated the porosity of geopolymer concrete (GPC) which seems to be obvious while observing its microstructure? What are the reasons of porosity in GPC? How can we reduce it by...

06 July 2017 1,877 4 View

What will be the effect of surface smoothness on the thermal contact resistance?

How will the results vary corresponding to the surface texture of the body in terms of thermal contact resistance?

05 June 2017 8,625 4 View

How can we relate UV radiation intensity with the UV index?

According to Environmental Protection Agency (EPA), UV index is predicted based on the solar ultraviolet radiation, stratospheric ozone concentration, cloud amounts, and elevation of the...

03 April 2017 8,042 0 View

What is the effect of solar concentrator on the solar spectrum?

Does the solar spectrum vary by passing through the solar concentrator? Is it dependent on the concentrator material which may absorb short wavelength and transmit certain wavelength? Please share...

03 April 2017 6,712 1 View

Why hot surface is cooled in the hotter ambient through natural convection?

In an experiment, the surface temperature of concrete raised quite higher than the ambient during day time due to intense irradiance. At night, this temperature was dropped due to convective heat...

02 March 2017 524 4 View

Why surface temperatures of different materials vary when exposed to identical ambient conditions?

In an outdoor experiment, I observed variations in surface temperatures of different materials while all of them were exposed to same ambient conditions (solar irradiation, wind speed etc). Please...

05 June 2016 3,000 6 View

Can Grashof number or Rayleigh number be negative?

I am calculating transient natural heat convection and for certain time interval the value of Rayleigh number is coming negative due to high ambient temperature as compared to surface temperature...

02 March 2016 4,464 13 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Is there any effect of different colours of light (white, red, yellow, blue etc.) on the rate of photosynthesis? If yes, why?

Light is inevitable for the process of photosynthesis reaction. Naturally sunlight plays the vital role for this process. Light may be of different colours like white, red, yellow, blue etc....

02 March 2021 7,890 2 View

In an eye with Tyndall, does each dot correspond to an individual cell?

When you observe the presence of Tyndall in an inflamed eye: Does each of the small floating dots correspond to an individual cell or to an aggregate of cells? Does a conventional slit lamp have...

27 February 2021 6,326 2 View

How can I obtain time series data by country on night-time light (brightness) ?

Hi everyone, Please, how can I obtain time series data by country on night-time light (brightness) ? I've tried, but so far all I can find are maps. I am looking for numerical data, especially in...

24 February 2021 8,625 4 View

What are difference between laser diodes, simple light emitting diodes and power light emitting diodes when operated in the visible spectrum ?

I want to illuminate a scene (small space) using LED to capture photographs or videos of some tiny objects inside the space. But am not sure if I should use a Laser LED, or simple LED or power...

22 February 2021 4,240 4 View

How to interpret this FTIR spectrum of pyrolyzed hydrochar?

20 February 2021 2,840 3 View

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The regenerated cellulose film was prepared by zinc chloride/H2O system. The zinc chloride had been washed away in the regeneration process, and the wet film which was not dried had uniform...

18 February 2021 9,538 1 View

How do I plot Pressure against crank angle degree in Fluent?

18 February 2021 8,390 3 View

How to get rough estimation of the concentrations of Oxygen and moisture inside the glove box?

Dear colleagues, I was just wondering if you can suggest a good method to get a rough estimation to the concentration of O2 and H2O inside the glove box as unfortunately, our glove box doesn't...

17 February 2021 1,012 3 View

Is there any free software for behaviour analysis of zebrafish ?

I need to do novel tank test and light/dark test for zebrafish. So I need a tracking software for tracking in these tests. Is there any free softwares available for tracking of zebrafish ?

16 February 2021 1,541 1 View