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Monday, January 31, 2011

Solar Energy: Interesting and Useful Facts for Consumers

Solar Energy: Interesting and Useful Facts for Consumers

This is a collection of interesting and educational facts about Solar Energy that consumers and people in general should know about!

1. One kilowatt-hour (kWh) equals the amount of electricity needed to burn a 100 watt light bulb for 10 hours. 

Use compact fluorescent lights and save!

2. A 1 kilowatt home solar system installed costs about US$9,000 (before any rebate programs). 

Prices up to $15,000 are also possible as are lower prices depending upon: a) the kind of PV System, b) country of purchase, c) how the system is purchased, and d) the surface to which the system is attached. Convert from US dollars to your local currency to find an approximate equivalent cost in your country.

3. A 1-2 kilowatt (1000-2000 watts) system takes between one and two days to install. 

4. An installed system costing $9 per watt peak, means about 25-30 U$ cents per kilowatt hour in a sunny climate. 

5. The solar module ("solar panel") itself accounts for between 40-50% of the total cost of an installed solar energy system. 

6. A sunny location (like Los Angeles, USA) receives approximately 5.5 hours per day of sunlight on average throughout the year. 

7. A cloudy location (like Hamburg, Germany) receives approximately 2.5 hours per day of sunlight on average throughout the year 

8. The typical main components of a solar home system are the solar module, an inverter, a battery, a charge controller and a su 

9. A typical silicon cell Solar Module will have a life in excess of 20 years. 

Its electric generating capacity may degrade gradually between 0-20% over its useful life.

10. Although solar modules are often warranted for 20 years or more, the warranty on the overall system is 5 years 

11. A Solar Energy System can provide electricity 24 hours a day. 

How? The solar electric modules are combined with batteries in one integrated energy system.

The Great Wall Myth

The Great Wall Myth
It is common mistake to say that The Great wall of China is visible from outer space. It is too thin to be noticed from such a great distance. There are no man made structures that are visible from space or moon. Man made objects start to disappear after 300 miles up. From that distance you can barely see the outline of the Great China Wall. If we consider that distance from Earth to Moon is around 384,403 kilometers/238,857 miles then we can draw reasonable conclusion that it would be impossible to see any man-made structures from such a distance. Astronaut Alan Bean said: "The only thing you can see from the moon is a beautiful sphere, mostly white (clouds), some blue (ocean), patches of yellow (deserts), and every once in a while some green vegetation. No man-made object is visible on this scale. In fact, when first leaving earth's orbit and only a few thousand miles away, no man-made object is visible at that point either."

Accept Challenges in life

NEVER MISS FIRST OPPORTUNITY !!
 
A young man wished to marry the farmer's beautiful daughter. He went to the farmer to ask his permission. The farmer looked him over and said, "Son, go stand out in that field. I'm going to release three bulls, one at a time. If you can catch the tail of any one of the three bulls, you can marry my daughter."  The young man stood in the pasture awaiting the first bull. The barn door opened and out ran the biggest, meanest-looking bull he had ever seen. He decided that one of the next bulls had to be a better choice than this one, so he ran over to the side and let the
bull pass through the pasture out the back gate. The barn door opened again.
 
Unbelievable. He had never seen anything so big and fierce in his life. It stood pawing the ground, grunting, slinging slobber as it eyed him. Whatever the next bull was like, it had to be a better choice than this one. He ran to the fence and let the bull pass through the pasture, out the back gate. The door opened a third time. A smile came across his face. This was the weakest,
scrawniest little bull he had ever seen. This one was his bull. As the bull came running by, he positioned himself just right and jumped at just the exact moment. He grabbed... but the bull had no tail!
 
Life is full of opportunities. Some will be easy to take advantage of, some will be difficult. But once we let them pass (often in hopes of something better), those opportunities may never again be available. So always grab the first!
 
Did you Know:
 
·        Did you know that books can breathe? People visiting the British Museum complained of getting headaches. This was because books seem to absorb or "breathe" in air and "breathe" out smells of their own. There was so many old books in the Museum that there was no fresh air left which meant people got headaches from breathing in bad air
 
·         The plastic things on the end of shoelaces are called aglets

List of phobias

List of phobias

Friday, lucky or not
In pagan times Friday was the luckiest day of the week because it was ruled by the planet Venus, the symbol of love and fortune. In fact, Friday is named in honor of Freya, goddess of Love. But for Christians, Friday has not been a good day. Adam and Eve is said to have eaten the forbidden fruit on a Friday and died on a Friday. Jesus was crucified on a Friday.
For centuries sailors refused to set sail on a Friday. It is told that when the reluctance of seamen to set sail on a Friday had reached such proportions that it interfered with naval operations, the British Admiralty decided to prove once and for all that it is a fallacy. They laid the keel of a new vessel on a Friday, named her H.M.S. Friday, and launched her on a Friday. On her first voyage, setting sail on a Friday, she was commanded by Captain James Friday. She left the harbor and nothing has since been heard of her or her crew. The identical story has also found its place in American lore. But – fear not – it is a myth.
The fear for traveling on a Friday continued until the early 20th century where in Europe bus and train travel was lowest on a Friday. But before you say “Thank Goodness, it’s Friday!” consider that, FBI statistics show, most robberies take place on a Friday.
The number 13
It is believed that the fear for the number 13 stems from primitive man being unable to count past 12. Numbers beyond 12 do now have an individual and independent name but are a combination of the first 12 numbers. With 12 being the end of the line, 13 was moving into unknown territory.
In Norse mythology the 13th number led to the death of Baldur, the beloved of the gods. When the 12 gods gathered for a banquet in Valhalla, Loki gatecrashed the party, increasing the number to 13, which led to the death of Baldur. It also happens that in Tarot cards, 13 is called “Death.”
The baker’s dozen
The “unlucky 13″ is the reason why the thirteen loaves that bakers once supplied were never called by the number, but described as “a baker’s dozen.” The thirteenth loaf was regarded as a special bribe for the devil not to spoil the sale or the bread.
The lucky number 13
But 13 is not unlucky for all. The Mayas worshiped the 13 gods of the upper world. The Aztecs climbed 13 steps to their sacred places. Buddhists paid homage to 13 Buddhas. In Jewish faith, God revealed Himself by 13 attributes of bountiful mercy (Exodus 34: 6-7). The orthodox Jewish prayer book hold the Thirteen Principles of Faith. Jewish boys celebrate their Bar Mitzvah at age 13.
The number 13 in Greek is triskaideka and the fear of the number 13 is called triskaidekaphobia.

The Nobel Prize in Physiology or Medicine 1907

Charles Louis Alphonse Laveran

Charles Louis Alphonse Laveran

The Nobel Prize in Physiology or Medicine 1907 was awarded to Alphonse Laveran "in recognition of his work on the role played by protozoa in causing diseases".

Mona Lisa Smile

Mona Lisa Smile, a painting which has become famous world wide is an art work created by Leonardo da Vinci. People have been gazing at Leonardo da Vinci's Portrait of the Mona Lisa with a sense of bafflement for nearly 500 years. It portrays a real woman of flesh and blood. Her enigmatic smile has seduced millions of art lovers. This painting became famous because of the fact that it looks lively.

If any one gets a glimpse of the picture, the first thing that strikes him is the amazing degree to which Lisa looks alive. She really seems to look at us and to have a mind of her own. Like a living being, she seems to change before our eyes and looks a little different every time we come back to her. First she is smiling. Then the smile fades. A moment later the smile returns only to disappear again. Even in photographs of the picture we experience this strange effect. Sometimes she seems to mock at us, and then again we seem to catch something like sadness in her smile. All this sounds rather mysterious, but its true. He is a great observer of nature and created this painting in such a way that he left something for the beholder to guess.

Many questions were raised by the observers of this painting like, what is with this lady's face? How did the great painter capture such a mysterious expression and why haven't other artists copied it? Many tried to answer these questions which gave birth to number of theories but Leonardo, the great observer of nature certainly knew how he achieved this effect, and by what means. Some gave a scientific explanation of how the eye and brain deal with different levels of contrast and illumination. Others explained how the human visual system is designed. Recently, scientists attributed the weird behavior of this painting to visual noise.

In any painting, if the outlines are not quite so firmly drawn, if the form is left a little vague, as though disappearing into a shadow, the impression of dryness and stiffness can be avoided. This is Leonardo's famous invention which the Italians call sfumato - the blurred outline and mellowed colors that allow one form to merge with another and always leave something to our imagination.

In the painting of Mona Lisa, Leonardo used the means of his 'sfumato' with the utmost deliberation. Everyone who has ever tried to draw or scribble a face knows that the expression of the picture rests mainly in two features: the corners of the mouth, and the corners of the eyes. Now it is precisely these parts which Leonardo has left deliberately indistinct, by letting them merge into a soft shadow. That is why we are never quite certain in what mood Mona Lisa is really looking at us. Her expression always seems just to elude us. It is not only vagueness, of course, which produces this effect. There is much more behind it. Leonardo has done a very daring thing, which perhaps only a painter of his consummate mastery could risk. Hats off to the wonderful work created by Leonardo! The people who had a close look at the picture notice that two sides do not quite match. This is most obvious in the fantastic dream landscape in the background. The horizon on the left side seems to lie much lower than the one on the right. Consequently, when we focus on the left side of the picture, the woman looks somehow taller or more erect than if we focus on the right side. And her face, too, seems to change with this change of position, because even here, the two sides do not quite match. One really admires the way in which he modelled the hand, or the sleeves with their minute folds. Leonardo could be as painstaking as any of his forerunners in the patient observation of nature.

Long ago, in the distant past, people had looked at portraits with awe, because they had thought that in preserving the likeness the artist could somehow preserve the soul of the person he portrayed. Now the great scientist, Leonardo, had made some of the dreams and fears of these first image-makers come true. He knew the spell which would infuse life into the colors spread by his magic brush.

Random Facts about the Sun

Random Facts about the Sun
The sun's average distance from the earth is about 91,500,000 miles. Since the orbit of the earth is elliptical, and the sun is situated at one of its foci, the earth is nearly 3,000,000 miles further from the sun in aphelion than in perihelion. As we attempt to locate the heavenly bodies in space, we are immediately startled by the enormous figures employed.
The first number, 91,500,000 miles, is far beyond our grasp. Let us try to comprehend it. If there were air to convey a sound from the sun to the earth, and a noise could be made loud enough to pass that distance it would require over fourteen years for it to come to us.
Suppose a railroad could be built to the sun. An express train traveling day and night at the rate of thirty miles an hour, would require 341 years to reach its destination. Ten generations would be born and would die; the young men would become gray haired, and their great-grandchildren would forget the story of the beginning of that wonderful journey, and could find it only in history, as we now read of Queen Elizabeth or of Shakespeare; the eleventh generation would see the solar depot at the end of the route.
Yet this enormous distance of 91,500,000 miles is used as the unit for expressing celestial distances--as the foot-rule for measuring space; and astronomers speak of so many times the sun's distance as we speak of so many feet or inches.