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Archived Articles about Education
Do You Need Dissertation Help? Let’s Find Out! By: Philip Green
You need dissertation help to complete your dissertation. Lots of people disagree, but they are not right. There are several reasons why you may need dissertation help.(read entire article)(posted on: 2010-01-27)
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What Can We Benefit From Good Books By: wallace
A man may usually be known by the books he reads as well as by the company he keeps; for there is a companionship of books as well as of men; and one should always live in the best company, whether it be of books or of men.(read entire article)(posted on: 2010-01-26)
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Spanish Language Courses: Choice Of Country, Course, And Comfort Levels By: John Rix
Hispanic immigration to mainland US is still the biggest because of it bordering Spanish-speaking countries in the south.(read entire article)(posted on: 2010-01-25)
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Is "reading Books Is Useless" Virus? By: Elice
With the development of our society, it becomes more and more important to learn more knowledge. Therefore, if you have enough knowledge, you can get a good job and live comfortably and you can obtain respectful from others.(read entire article)(posted on: 2010-01-25)
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Should You Open A Money Market Savings Account By: Marcilio David
The economy has really taken a lot of us on a ride recently. We are a nation of spenders, not savers, and that has really come back to bite many of us. The good news is that we can see this downturn as an opportunity to protect ourselves better in the future. Opening a money market savings account is a great first step to take.(read entire article)(posted on: 2010-01-23)
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Dissertation Writing - Why Do Students Procrastinate & What Is The Solution? By: Philip Green
There are several reasons why students procrastinate dissertation writing. Here we will discuss the most common reasons that can prevent you from writing a dissertation successfully.(read entire article)(posted on: 2010-01-22)
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The Memory Can Be Improved By Regular Jogging By: wallace
We all know that jogging is good for our body, but according to scientists from Cambridge University study, jogging is also good for the psychology. The study found that regular jogging can generate new cells in the brain and improve memory.(read entire article)(posted on: 2010-01-22)
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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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