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Archived Articles about Education
Human Resources Mba Combines Knowledge And The Traits Of Leadership By: Roger Pointing
Managing people is one of the toughest and most challenging job of all. The employees of an organization are trained, motivated, praised and their benefits are looked after by the HR department that employs Human Resources MBA professionals who have the knowledge, skills and attitude to manage and lead an entire workforce.(read entire article)(posted on: 2010-01-21)
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Laser Pointers: An Insight By: cierrabarone34
Laser pointers utilize a small laser to draw attention to a certain spot. Though by itself, it is invisible, it becomesPublic concern has been aroused over the last couple of years, since even though laser pointers are designed to be safe, they can be misused very easily.
Flash Back
The first pointers used laser contained helium-neon gas. The laser radiation generated was at 633nm (nanometers) with power out put of maximum 1 mW (milli watt). For such lasers which have less than 1mW power and radiation between 440 and 700 nm, the human eye blink reflux offers adequate protection. These lasers are known as Class 2 laser. Retinal injury can be caused to a person deliberately looks into the beam, overcoming natural reflux.
Following this was the diode lasers which have beams of 690nm with power output pf 5mW. Both are red wavelengths visible to naked eye but the eye sees 633nm brighter than 690nm. This explains the need for higher power for an output equaling that of 633nm laser pointers.
The green laser pointer makes use of frequency doubled Neodymium with a blocked infrared component. The wavelength of this laser pointer is 533nm and it is brighter than the other pointers. Pointers that operate needing 1-5mW power are called as Class 3a lasers and have been proved to be hazardous if viewed for even a short time period. These lasers are required by Food and Drug Administration regulations to be marked as Danger. Class 2 lasers are marked as Caution.
Associated Effects
No user should look at the laser beam directly. The hazards that can occur include:
*Startle effects
*Flash blindness
*Glare
*After images etc.
The law considers pointing laser at people as a criminal misdemeanor and the crime becomes a felony if laser is pointed towards an aircraft. Moreover, in some jurisdictions it is necessary for the purchaser of laser pointer to be above 18 years of age. Also, lasers requiring more than 5mW power should not be used as pointers.
Blue And Green Laser Pointers
Blue and green lasers differ in price. Green laser is less expensive when compared to blue laser. The price difference is mainly due to difference in processes that are used to generate the laser beams, components used and the volume in which they are manufactured.
Both laser beams use diode but they differ in the optical coating of pumped crystals and infrared light producing them. Green laser produces 1064nms infrared light while 946 nm infrared light is given out by the blue beam. Thus blue lasers require a larger pump diode making them more expensive. Green lasers have better visibility and hence are in more demand leading to higher volume of manufacturing. Green lasers are used in astronomy, burning, signaling, pointing and other diverse applications. Thus, the higher the manufacturing volume, the lower is the price.
Laser beams should be used with caution and only for the purpose they are intended.(read entire article)(posted on: 2010-01-21)
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Should We Exclude Lu Xun's Work From Junior High School Text Books? By: Alma tang
The main thing is to remember the history our country. The classical article can tell us what did happen at the time. And many articles are difficult to understand for junior high school students.(read entire article)(posted on: 2010-01-21)
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Continuing Education By: maria gini
Education is one of those things that cannot be limited to any particular age group. There can be no restrictions to continuing one’s education throughout one’s life. After all education is what lends a person wisdom, grace and dignity. It helps keep the mind in harness. More than that it can prove the passport to better paying jobs and in times of economic distress, it is education which can ensure survival. The well-educated person creates a special slot for her/himself.(read entire article)(posted on: 2010-01-21)
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Full-time Mba Class Of 2009 Gives Back To The College Of Business Administration By: knoxville
On December 11, the College of Business Administration graduated 89 students from its 17-month Full-time MBA program, hosted in the Alumni Memorial Building on the UT Knoxville campus.(read entire article)(posted on: 2010-01-20)
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Behaviors Of Brothers And Sisters In The Family Can Also Affect Children By: wallace
A lot of parents understand that their behaviors have played an important role for their children's future. But the U.S. study showed that in addition to the behaviors of their parents, the children will imitate the behavior of their brothers and sisters.(read entire article)(posted on: 2010-01-20)
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The Ability Of Self-control Can Be Infected By: wallace
U.S. researchers found that the ability of self-control can be infected, that's mean a person's ability of self-control would be enhanced by seeing or thinking of a strong self-control men.(read entire article)(posted on: 2010-01-19)
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Long-term Lack Of Sleep Can't Be Made Up By: wallace
If you are in the case of lack of sleep in consecutive weeks, you may choose to have a long sleep on a Saturday or Sunday, which may make you feel refreshing. New research shows that it is not so easy to make up for long-term lack of sleep.(read entire article)(posted on: 2010-01-18)
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Compulsory Voting: The New Fatwa? By: Johnson Philip
Voter apathy is something to be lamented about. However, the quick-fix solutions that politicians and people offer for national (and also for the not the larger) problems is to be lamented even more. It seems that idiocy is at a premium when it comes to solving problems that affect the masses.(read entire article)(posted on: 2010-01-17)
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An Essential Way To Teach Science Projects By: johnmartin1
There are a lot of differences between the science and scientific. Science means it is a core set of toys, but the scientific means experiments with the science.If your student or children are unable to understand the science experiment, the best solution is experiments with these science kits.(read entire article)(posted on: 2010-01-16)
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