Think Science .

While the active material in CFLs is mercury which has already been shown to be the most dangerous pollutant on the globe, the active material in LEDs is arsenic.

I will grant that arsenic is much easier to contain/recycle than mercury, but LED bulbs have their own problems… Top of the list is that the energy output required to produce them actually exceeds the energy saved by using them.

The “green energy” people do have it right… We need to concentrate on cleaner, more efficient, and renewable energy sources. Even putting pollution aside, the Earth has enough oil reserves to last about another 60 years or so… and then we’re pretty much out. We have coal reserves to last about 100 years or so, but that’s got it’s own set of problems.

Of course the “conservatives” are intentionally blind as well with their focus on “nuclear” power because the uranium reserves are even more limited than oil. We have enough uranium to last about 50 years or so.

Solar, Wind, Hydroelectric, and whatever new technology we come up with in the future isn’t just “nice”, it’s necessity. At least for those of you planning on being around in 60 years.

Earlier i blogged about Quantum computing and some of the basic concepts of it. Today let’s talk more about it.

In Jan 23 . A team of Scientists managed to transfer qbit from one atom to another distant atom.As qubits hops from one atom to another without crossing the space between two, so team call this behavior similar to teleportation.

Steven Olmschenk, says transferring information between atoms could aid the developement of ultra fast quantum computers and secure quantum communication. The catch here is that you can’t read information on it without destroying it. So the limitation is you can send it farther without reading and more such limitations comes in quantum world.

Let’s see what we can see in the world of Quantum computing tommorow.

Transistor testers are instruments for checking transistors and solid-state diode.There are three types of transistor testers each performing a unique operation.

* Quick-check in circuit checker
* Service type tester
* Laboratory-standard tester

In addition,Signature-pattern checkers(Curve tracers) are reliable indicators of transistors performance.

1.Circuit Tester
It is used to check whether a transistor which has previously been performing properly in a circuit is still operational.The transistor’s ability to “Amplify” is taken as a rough index of its performance.This type of tester indicates to a technician whether the transistor is dead or still operative.The advantage of this tester is that the transistor does not be removed from the circuit.

2.Service type transistor testers
They usually perform three types of checks
*Forward-current gain,or beta of transistor.
*Base-to-collector leakage current with emmiter open(ico)
*Short circuits from collector to emmiter and base.

Some service tester include a go-no go feature.Some also provide a mean of identifying transistor elements,if these are unknown.The tester has all these features and check solid -state devices in and out of circuit.Measurements with the service type tester are relative than absolute.Even so,they are valuable to a technician in maintaining transistorized equipment.

3.Laboratory-standard transistor tester or Analyzer
They are used for measuring transistor parameters dynamically under operating conditions.The readings they give are absolute.Among the important characteristics measured are

*Icbo collector current with emitter open (Common base)
*ac beta (Common emitter)
*Rin (Input resistance)

Transistor testers have the necessary controls and switches for making the proper voltage,current,and signal settings.A meter with calibrated “Good”and “Bad”scale is on the front.

Transistor tester are designed to check also the solid-state diodes.There are also testers for checking high transistor and rectifiers.