gm Definition and 37 Threads

Hi, I am an undergraduate electronics engineer building a GM counter for my final assessment. I read a lot of theory about GM counters as well as the nuclear physics theories in general, but there is one thing I can not find an answer to. Why do none of the GM counters detect alpha particles? I...

Recently I measured a range of sources with two detectors comparing their efficiency. One of the sources used (C-14) was a pure beta emitter and it made me wonder. If a radioactive source decays by beta then gamma, will one decay register as two counts as two radioactive particles are produced...

https://www.circuit-diagram.org/editor/ Hi, I was wondering if this is a good voltage rectifier and regulator for a GM tube power supply? The AC supply is approximately 500V, and the strange component at the bottom is a voltage regulator tube. Seems to work OK but I don't have any test equipment...

The radio would work sometimes if it didn't pushing on the tuning buttons hard or hitting the dash underneath would make it work if it didn't work, this has been that way for 30 years, now it does not come on at all. I always thought it must be broken connection some where. I had applied voltage...

Hi all, 1. Homework Statement http://imgur.com/kqZK1Vv This is the loop gain (A.F.) of unity feedback system. I need to extract DC Gain Bandwidth GBW (is GBW Gain Bandwith ?) f unity (I suppose this is unity frequency) Phase Margin Gain Margin What is the optimal PM and f2/GBW for time and...

Homework Statement If a+b+c=0 then ( (b-c)/a + (c-a)/b + (a-b)/c )( a/(b-c) + b/(c-a) + c/(a-b) ) is equal to: Ans: 9 Homework Equations AM>=GM>=HM Equality holds when all numbers are equal. The Attempt at a Solution I tried using AM>=GM. ( (b-c)/a + (c-a)/b + (a-b)/c + a/(b-c) + b/(c-a) +...

I was looking into what cylinders need pairing to make a set 0f 180 headers for an LS V8 engine. When looking the pairings shown below. LS firing order 1-8-7-2-6-5-4-3 Passenger (L) side = 1 3 5 7. Driver side (R) 2 4 6 8 1-8-7-2-6-5-4-3 L-R-L-R-R-L-R-L for a 4-1 header I get. 1-7-6-4...

Hi everyone, I'm a bit confused with this question. An airline demands that all carry-on bags must have length + width + height at most 90cm. What is the maximum volume of a carry-on bag? How do you know this is the maximum? [Note: You can assume that the airline technically mean "all carry...

Could someone please help me with this question: What values are we meant to use to prove this inequality? many thanks

Homework Statement Two closed containers A and B contain equal number of moles of ideal gases GD (diatomic)and GM (Monoatomic) ,respectively. Q .1 a) If the temperature of gases are same,which of them has more average translational kinetic energy ? b) Which of them has more...

http://www.huffingtonpost.com/2012/09/19/monsanto-genetically-modified-corn-study_n_1897361.html The point that was made on the news yesterday (also somewhat mentioned in the article): this is claimed to be the first long term test of that food on animals. The main point of dispute (going far...

Hi, I'm a new member in the forum. I own two similar GM military grade meters with calibration certificates, calibrated for gamma-rays metering and each one has two tubes filled with helium, argon (or neon), halogen (or quenching) gases. When I am exposed to some radiation source, my GM meter...

http://en.wikipedia.org/wiki/Chevrolet_Volt In this series hybrid, engine and generator charge the battery and battery powers the motor, and can be made with components already available. The Ampera is claimed to do 175mpg (vs 40mpg on my current car). So I wonder why there aren't more cars...

Homework Statement Don't laugh! I am scratching my head. Somewhere I am doing something very stupid, but I just don't know where. My problem is that my result of G*M of Earth is different than the accepted result of G*M. Accepted value of G*M: μ = 398600 km^3 s^-2 Homework...

Or are people overreacting without understanding the science? http://news.yahoo.com/aussie-police-shut-greenpeace-hq-seize-evidence-081852648.html

Any buyers? http://www.guardian.co.uk/environment/2010/dec/19/general-motors-hybrid-chevrolet-volt?CMP=twt_fd

Homework Statement Prove a)5 < 51/2 + 51/3 + 51/4 b) n > n1/2 + n1/3 + n1/4 for all ints n>8 Homework Equations The Attempt at a Solution i tried the AM GM inequality and found 51/2 + 51/3 + 51/4 > 3(513/36) what further can i do? can anyone please help me out??

Something I recently discovered So in some cases it appears that crosspollination between roundup ready gmo crops and some types of weeds has been happening. So other than sending out hordes of illegal immigrants with hoes to dug them all out, what possible solutions are there for this problem?

In this http://www-conf.slac.stanford.edu/einstein/Talks/aspauthor2004_3.pdf" L. Riofrio introduces a GM = tc^3 relation. where does this come from. Please help I know that GM=rv^2 for orbits. This is simple enough, but She also introduces a r=ct term and v=c I'd like to know whee this comes...

Homework Statement What are the difference between ionization chamber and GM tube in structure which make them have different functions? The Attempt at a Solution Higher voltage is applied to GM tube so that electron avalanche can occur. Then I wonder that if higher voltage is...

Homework Statement A point source of alpha particles, a tiny mass of the nuclide Am (atomic number 95, mass number 241) is mounted 7cm in front of a GM tube whose mica window has a receiving area of 3cm2. The counter linked to the GM tube records 54000 counts per minute. Calculate a. the...

I have just started a book on GM. As motivation for the idea that gravity must affect the energy of light the following example is given. A body of rest mass,M, falls in a gravitation field and bounces off of the ground after it has achieved velocity,v. At impact, it transforms completely...

Alright, there's something I don't understand. The book says that the gain margin and phase margin must be non-negative for a minimum phase system to be stable. But the definition of a minimum phase system is one without right half plane poles or zeroes. Doesn't that inherently make it stable...

I'm talking about one of these: http://www.eldan.biz/emall/shops/1903/45983-tb-Automess-dose%20rate%20meters.jpg The use a Geiger-Muller gas chamber which can only detect when A UNIT of gamma or beta radiation (or alpha if you have a really tiny window) goes through, but it says nothing...

The good the bad and the ugly. http://www.nytimes.com/slideshow/2009/06/01/automobiles/01GM_USER_SLIDESHOW_index.html

http://www.google.com/hostednews/afp/media/ALeqM5iDkrR9K_sSP-BxgI_CEdpYtl4VIA http://www.google.com/hostednews/afp/article/ALeqM5gN4pf_E8M_gBzWETe8o8rmbLDdbQ Visionaries, or cockeyed optimists?

Within the last six months, I heard about two local police chases, with one being right down the road from my residence just last night. I see reports that GM OnStar will permit the police to shut down vehicles with the installed system at will. Anyone know of the validity of this report...

How do GM crops (both current and potential in the near future) compare with organic in terms of output per acre? How does it compete with such methods as Fukuoka Natural Farming, and other forms of permaculture?

GM gives voice once again to its American workers with the ... GM Employee Discount , yeah the workers in that commercial sure seemed to be excited about it , I wonder how many actual GM employees are celebrating. All of this comes after thousands of GM jobs were moved from the US for the sake...

There is no wonder GM is going under since it hasn't been selling fuel efficient vehicles in America. Now they are going under because people aren't buying as many big trucks and SUVs. GM sells fuel efficient vehicles in other countries that they don't sell here, and why? Why should they...

General Motors nowaday is losing market share, mainly to Toyota. What do you guys think GM should do to regain its market position?

Anyone familiar with GM tube, please share some experience on the effect of temperature to GM tube performance, how does it influence? I found our GM tube tally has increase a little as the temperature increased rapidly from 4 degree to 55 degree, I wonder is it a casualness or a indication of...

http://www.detnews.com/apps/pbcs.dll/article?AID=/20061129/UPDATE/611290443

im trying to find the maximum distance of a spacecraft from the earth, whre GM is used ( M is the mass of the Earth and G is the gravitational constant) ... i was just wondering if there is a general formual for this?

Hi, does anyone know anything about reverberation chambers? specifically does anyone know about the industry standards, a camparason between SAE J1113/27 GM 9120P GM 3100GS GM 9114P or any other standards which allow for a 2 -> 3Ghz operation would be helpful, thanks

Hi again, I was able to solve the previous problems I had, with some study over the net and some books. Now I have a different problem: I have a routine that uses Mu (GM) for calculations; for the planets, Mu = GaussK * GaussK * ( 1 + mass ), where GaussK is the Gaussian constant...

In general relativity the equation t1 = t2 ( 1 - 2 GM/ r c ^ 2) ^1/2 is often mentioned. If the mass, M, is equal to the mass of the universe - 10 ^ 52 kg - then r cannot be less than 10 ^ 24 metres without invoking the idea that a time can be imaginary. But could an equally valid...