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TODAY IN HISTORY

    HAND-HELD CALCULATOR
    February 1, 1972 - United States

    The first scientific hand-held calculator was introduced for $395 by Hewlett- Packard, named the HP-35 for having 35 keys. It was the first hand-held calculator able to perform logarithmic and trigonometric functions with one keystroke. The red LED display could give scientific notation up to 10 digits mantissa and 2 digits exponent. The price was reduced several times, eventually to $195. By Feb 1975 (when production of the model was discontinued), 300,000 had been sold. The numbers and functions for calculations were entered in “Reverse Polish Notation”(RPN), which used an “ENTER” key but needed no parentheses or “=” key. It ran on rechargeable batteries and had electronics with several integrated circuits in a 79 ×147×34 mm (3.1" x 5.8" x 1.4") case.

    OBAMA SHUTS DOWN THE MOON PROJECT
    February 1, 2010 - United States

    Barack Obama has canceled NASA's plans for taking men to the Moon. The Constellation program had been looking at new rockets and a crewship to put astronauts on the lunar surface by 2020. In the 2011 budget request that was issued on Monday, February 1st, Obama has said that the project is too costly, 'behind schedule, and lacking in innovation.'

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RANDOM QUOTES

  • No Man is Above the Law
    by Theodore Roosevelt

    "..."No man is above the law and no man is below it; nor do we ask any man's permission when we require him to obey it. Obedience to the law is demanded as a right; not asked as a favor."..."
  • All of us have a God in us
    by Earth Day, Kenya

    "...All of us have a God in us, and that God is the spirit that unites all life, everything that is on this planet. It must be this voice that is telling me to do something, and I am sure it'as the same voice that is speaking to everybody on this planet at least everybody who seems to be concerned about the fate of the world, the fate of this planet. Wangari Maathai-Noble Peace prize winner, Deputy Minister of Environment, founder Green Belt movement in Kenya...."

RANDOM FACTS

  • Drug Abuse
    about Facts about Drugs

    Facts about drugs can protect against drug abuse. Legal drugs, such as alcohol and tobacco, kill more people than illegal drugs. Tobacco (smoking cigarettes) kills more people than any other drug. Illegal drugs including heroin, cannabis, ecstasy and amphetamines can have unknown or dangerous ingredients. Mixing drugs, especially with alcohol, can be fatal. Cancer Facts & Figures
    about Besides Lung Cancer

    Besides lung cancer, tobacco use also increases the risk for cancers of the mouth, lips, nasal cavity (nose) and sinuses, larynx (voice box), pharynx (throat), esophagus (swallowing tube), stomach, pancreas, kidney, bladder, uterus, cervix, colon/rectum, ovary (mucinous), and acute myeloid leukemia.

Going further inside HVAC :

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Regardless of whether you're a skilled heating technician or perhaps are interested in the Heating and cooling marketplace then this article may be for you.

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Whether you are an experienced heating technician or simply just have an interest in the HVAC sector then this write-up is designed for you. It'll provide you with a backdrop to the HVAC sector to make sure you will be more aware about the areas it encompasses. The first aspect we are going to take a look at is the topic of heating. What exactly do we mean by heating? It does depend upon what you will be heating up. As an example if you are looking to warm up the front room in your home on a cold winters night then you may just need a portable heating device. However if you are looking to heat a larger area you might need to use something else entirely.

Many buildings use a central heating system to supply heat. This approach might use a central heating boiler, heat pump or possibly a furnace. Heat created will then be dispersed using a system of piping or ducts. The dispersal network will be chosen dependant upon the building that is being heated up and the type of central heating unit in use. The second letter in the abbreviation HVAC is V for ventilation. Ventilation comes in various forms but is going to fit in 1 of 2 areas. Either forced (also called mechanical) ventilation or natural. Mechanical ventilation can be achieved through the use of fans to either remove air or to inject fresh air in to a room.

Natural ventilation is much easier to achieve, believe it or not as simple as opening up a window. However typically this will be accomplished by either a vent or even air bricks. One benefit of natural air flow is it can help to eliminate the spread of airborne diseases such as the flu virus. Another good rationale to implement natural ventilation is the fact that it truly is inexpensive plus relatively easy to operate. Ventilation is essential in establishing a heating system. The explanation for this is whenever there is very poor ventilation then there could be a build-up of gases.

This might trigger smaller challenges including ineffectiveness in the heater or larger challenges., for instance a large amount of carbon monoxide might cause poisoning or possibly loss of life. Last of all we come to the air conditioner component of HVAC. Air conditioning may be put in position with fans but a majority of solutions operate in the same basis as the air-con inside your car. This process usually operates by using a special fluid in pipes. As this liquid warms up it'll take in the heat when it turns into a gas. This'll then travel around the system as a gas to become re-condensed, starting the complete process once again.

The fantastic thing about some air conditioning units is this technique can be altered to produce heating instead. Of course this will not work with all air conditioners but it's a feature to be familiar with. So there you have every one of the aspects that comprise HVAC, discussed in a little more detail. However this is merely an outline. Next, to be able to learn even more details regarding

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  • Ambirad
    A leading European manufacturer of gas-fired radiant heaters and supplier of warm-air systems and air curtains.

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