# fiveworlds

Member Since 06 Dec 2012
Offline Last Active Today, 03:06 AM

### In Topic: Microwave tests on humans

Today, 02:28 AM

My question is the following: did the authors of this experiment use the each subject 9 times per day, or 9 times throughout the entire period of the experimentation? I feel that this information should be important given that if you make the subject come back every day for 9 days the results would not be as accurate?​

I'm not buying the book to find out. As it is they only tested seven people.

### In Topic: Ethics of using Stem Cells to Create Human Chimeras

Yesterday, 07:41 PM

What a great topic. We have been modifying animals for years to produce insulin for diabetics etc. I would think that so long as the animals is not in considerable pain throughout life and the mutation isn't spread to the rest of the animal population then it is fairly okay.

### In Topic: Speed of depressurization

Yesterday, 05:15 PM

Gas Dynamics?? There are a few equations most have to do with pipelines such as.

Simplified gas formula

This formula is recommended for most general-use flow applications.

Weymouth equation

The Weymouth equation is recommended for smaller-diameter pipe (generally, 12 in. and less). It is also recommended for shorter lengths of segments ( < 20 miles) within production batteries and for branch gathering lines, medium- to high-pressure (+/–100 psig to > 1,000 psig) applications, and a high Reynolds number.

Panhandle equation

This equation is recommended for larger-diameter pipe (12-in. diameter and greater). It is also recommended for long runs of pipe ( > 20 miles) such as cross-country transmission pipelines and for moderate Reynolds numbers.

Spitzglass equation

The Spitzglass equation is recommended for low-pressure vent lines < 12 in. in diameter (ΔP < 10% of P1).

The petroleum engineer will find that the general gas equation and the Weymouth equation are very useful. The Weymouth equation is ideal for designing branch laterals and trunk lines in field gas-gathering systems.

http://petrowiki.org...along_pipelines

http://www.pipeflowc...le-gas-flow.php

### In Topic: Automatic height adjustment microphone stand

Yesterday, 03:21 PM

Ah I see. I think a third might be needed as a there's no one stood there sensor at a very low height.

You can detect the range to the nearest object with ultrasound. If there is no one there it won't detect an object. https://www.arduino....ltrasoundSensor

Though it could detect a wall if you placed the stand near one.

### In Topic: Automatic height adjustment microphone stand

Yesterday, 02:51 PM

I was assuming the sensor system had to be on the mic stand.

Yeah on the stand one sensor placed above the mic to see above your head and one placed below the mic to tell if the mic is raised too high.

There should also be buttons to raise and lower the mic in case the sensor is slightly off and a button/switch to activate the automatic raising since it would be undesirable if the singer was moving alot.