Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [radiation]

The tag has no usage guidance.

0
votes
0answers
35 views

Which one should be located further from the body: SMPS or linear power supply?

The linear power supply is working in 50/60 Hz frequency and it creates alternated electric and magnetic fields. The SMPS is working in the kHz frequencies and it creates RF radiation in the IF(...
1
vote
0answers
25 views

Method to simulate a dipole antenna in salt water?

I am looking to simulate the radiation pattern of a 2.7Ghz half-wavelength dipole antenna immersed in salt water. I've been using Altair FEKO software to try and accomplish this. I've tried two ...
0
votes
1answer
40 views

Epoxy that can withstand up to 800C and is optically transparent?

I'm looking to use an epoxy in a high-temp environment like 800C, and one that is optically transparent at 450nm (not below 90% transmission). But i'm having trouble finding one. It can be made of any ...
0
votes
0answers
193 views

Radiation “not working” in Solidworks Simulation

I am just starting out on Solidworks Simulation, and I am trying to set up a simple model to get a grasp on the module. I have a "Bulb" which is emitting thermal power while rigidly attached to a ...
1
vote
2answers
67 views

Blackbody radiation

If we are able to see an object in a certain color,that means it reflects the color.A blackbody is one which has zero reflectivity.Then how come it is not black always?
1
vote
0answers
20 views

Dose rate through shielding from Co-60 to verify Monte Carlo result?

I need to calculate the dose rate leaking from sealed Co-60 sources. Let's say the activity of a source is 7 TBq. The source is tube shaped, 2 mm radius and 10 mm in height. There is 5 cm of ...
1
vote
0answers
484 views

What is the gray-body emissivity value of air

Wonder if anyone would know what is the average thermal emissivity value of air relative to blackbody at near room temperatures? I am looking for that magical number between 0 and 1. Looked everywhere ...
1
vote
1answer
115 views

What is the inuition behind the radiation view factor reciprocity?

I have known that the view factor reciprosity is that Ai x Fij = Aj x Fji But i can't intuitively explain the logic behind this, i do know that the view factor Fij is the portion of the radiation ...
0
votes
0answers
14 views

Get power distribution from radiation pattern

I'm trying to get the power (or E-field, or antenna element) distribution of an antenna given the radiation pattern. I know that if you have a power distribution $P(x)$ along the antenna to start ...
1
vote
3answers
76 views

Radioactive Materials to Energy AT HOME

Is there a way to use a radioactive elements (Americium in my case, but for demo, any radioactive material) to create a usable amount of energy (Power small LED?) AT HOME! Using materials that can be ...
-2
votes
1answer
101 views

What thing will make phone emit more radiation? [closed]

I am looking about things will make phone emit more radiation and I found some case Bad mobile network signal Turn on Bluetooth and Wifi Moving fast When start dial When start send message Battery (...
2
votes
2answers
404 views

Do smoke alarms become more sensitive as they get older?

From what I understand a smoke alarm works by emitting some sort of radioactive particle and then counting how many of these particles hit a receiver. When there is smoke in between, it blocks some of ...
0
votes
1answer
171 views

Surface in the sun vs. surface in the shade [closed]

What is the difference in temperature between a surface in the sun as supposed to one in the shade and how is it calculated? For instance: What will the temperature be if a metal sheet lies in the ...
4
votes
1answer
673 views

Heat Transfer coefficient calculation for hot air flow inside rectangular duct

I am working on modeling of air-heater component. A simplified representation of system is as follows: Cold air flow enters steel duct at one end. Inside duct is Calrod heating element shaped as ...