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Drug test

12.07.2004

About seven million American adults use drugs regularly. Therefore, the issue of their detection in suspected drug addicts is acute.

Dragwipe has released a miniature device for detecting four main groups of drugs in human sweat - these are opiates, cocaine, amphetamines and cannabis drugs. The analysis takes one to two minutes, it is enough to pass the sensitive element of the device over the skin of the person being tested several times.

If a person refuses to be analyzed, traces of drugs can be detected on objects that the suspect touched: steering wheel, computer keyboard and mouse, door handles and electrical switches in the apartment.

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Random news from the Archive

Electrons tunnel through the barrier instantly 31.03.2019

An international team of scientists has found that particle tunneling through a potential barrier occurs instantaneously, and not after a finite time, as recent studies have shown.

During the experiment, physicists used hydrogen atoms. The time it takes electrons to tunnel was measured using an attoclock, a device that generates laser beams of a few attoseconds (10 to the minus 18th power of a second) and is able to calculate when electrons are released from an atom. A thousand ultrashort light pulses with a total power of 30 gigawatts interacted with hydrogen.

Although tunneling was originally thought to be instantaneous, recent studies using multi-electron atoms have shown that electrons travel through a potential barrier in a finite non-zero time. However, hydrogen atoms, which have one electron, have allowed more accurate measurements and calculations to be made to solve this mystery. The results of the experiment showed that the observed picture corresponds to the data obtained in the theoretical simulation of instantaneous tunneling.

The tunnel effect, which can be represented as the passage of an object through a wall, is observed in quantum systems and is impossible in classical mechanics. It lies in the fact that a particle can overcome a potential barrier without having enough energy to do so, due to the Heisenberg uncertainty relation. A potential barrier is a region of space that separates two other regions with different or identical potential energies.

Electron tunneling through an ultrathin barrier is the basic principle of operation of many modern electronic devices used in a wide variety of electronic devices (for example, gadgets). The new discovery will allow more accurate modeling of the processes occurring in them.

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