Posts Tagged ‘government’

Some Facts About Archery

Friday, August 27th, 2010

People have been involved with archery for a minimum of four thousand years, but very nearly certainly for a lot longer than that. Sections of composite recurve bows have been found dating back to the second millennium BC, but the parts that were found were the non-wooden, composite parts, usually of horn.

The wooden sections ordinarily rotted away thousands of years previously, but a wooden longbow from the same period was found in Somerset. Most probably, people had been using all wooden, single piece bows long before they started constructing complex composite recurve bows.

The skill of archery has always fascinated mankind and, in spite of the fact that guns have made archery outmoded, it still fascinates people today, although these days archery is practically reserved used for recreational purposes. It is a thriving sport and hobby and is the national sport of the Kingdom of Bhutan.

If you are interested in practising archery, you will first have to make your mind up which kind of bow you prefer. Among other varieties, there are the longbow, recurve bow, reflex and decurve bows, deflex bow, pyramid bow and crossbow.

To a certain degree, the arrows are not interchangeable either. For example, a longbow can cast a three foot, heavy-gauge arrow, whereas a crossbow shoots a six inch bolt. The bows also had different uses although there was a certain degree of common ground.

For example, longbows were the heavy, rapid-firing artillery of their day, being able to lob a heavy, armour-piercing arrow hundreds of yards; whereas a short recurve bow was perfect for attack from horseback. Crossbows took less ability to operate but were slower than a bow.

There are different kinds of arrow as well. Traditionally, arrows were made of wood with a pointed metal tip, but these days arrows can be made of aluminium or carbon fibre. The arrowheads are different for different uses as well. A plain brass tip is adequate for everyday shooting whereas a vicious, slashing broadhead is used for killing.

The majority of people who take archery seriously use carbon fibre arrows these days which is the standard arrow shaft used at the Olympic games. The flights are usually of bird feathers and are used to steady the arrow in flight to minimize wobble. Plastic flights are also to be had as they are less susceptible to damage.

The Welsh (and English) longbow was perhaps the most powerful hand bow extensively used. These longbows were typically six feet or more in length and made of one section of seasoned yew (or other woods). The draw weight of a Welsh longbow at the time of Henry VIII was between 160 -180 lbf and that would shoot a heavy three ounce arrow up to about 280 yards.

An explanation of the damage that one of these arrows could inflict was given by Gerald of Wales in the 12th century:

“… in the war against the Welsh, one of the men of arms was struck by an arrow shot at him by a Welshman. It went right through his thigh, high up, where it was protected inside and outside the leg by his iron cuirasses, and then through the skirt of his leather tunic; next it penetrated that part of the saddle which is called the alva or seat; and finally it lodged in his horse, driving so deep that it killed the animal”.

It took years of training to draw and shoot one of these longbows bows accurately.

Owen Jones, the writer of this piece writes on various topics, but is presently concerned with archery recurve bows. If you would like to know more or for special deals, please go to our website at Kids Archery Set.

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A Short History Of Archery

Wednesday, August 18th, 2010

Archers have played a key part in warfare and hunting for thousands of years. Primitive bows were made of a single piece of wood, but composite recurve bows were being manufactured from Greece to China as far back as the second millennium BC.

Recurve bows, those with the ends facing the ‘wrong way’ when unstrung, are more powerful inch for inch in length than one piece wooden bows, which made them more suitable to confined conditions such as on horseback, in a chariot or in wooded areas.

Pieces of composite recurve bows, usually made from horn, have been found in many regions of the world. Early arrows were made from naturally straight twigs or pine needles with napped flint tips affixed. Wooden bows did not keep so well and examples are scarce.

It seems that archery was being developed in the early Mesolithic or late Paleolithic Age. Archery was especially well developed in some Islamic countries and in Asia, where Zen Buddhist monks utilized archery as an element of their meditation techniques.

In the early days of archery, there were mixed sentiments about archers. In those days, people fought hand to hand with swords and spears and some of the traditionalists thought that archers were cowards because they attacked from a distance out of direct danger. This point is made very obvious in ‘The Iliad’, Homer’s account to the siege of Troy.

There are or were many types of bows made to suit different fighting or hunting conditions. Some varieties of bow are the; long bow, short bow, recurve bow, composite recurve bow, reflex bow, decurve bow, deflex bow and crossbow among others.

The longbow was tremendously difficult to learn to use and the archer had to have massive upper-body strength. The bow was often six feet long with a heavy three foot long arrow. The draw weight for maximum power was around a hundred pounds and the function of the bow on a battleground was as long-range artillery.

The heavy arrows and vicious armour-piercing arrow head would rain down on the enemy from a hundred yards or more and penetrate shields and armour as if they did not exist. Shot horizontally, the three-foot arrow could pass through a couple of people.

In fact, the longbow was so essential to the triumph of Great Britain that a law was passed making it obligatory for men over a certain age to practice with their longbows every Sunday on the village green in order to develop the required skills and upper-body strength in case war came.

The arrows are made to go with the different kinds of bows and the different bows and their specific arrows are suited to different kinds of hunting – whether you are hunting men or animals.

There are essentially two types of shooting: instinctive shooting, which is very demanding as the archer does not take his eyes off the target, but does not sight down the arrow; and sight shooting where the archer makes use of sights to align the arrow with its target. Most people find sight shooting easier.

Owen Jones, the author of this article writes on several topics, but is presently concerned with archery recurve bows. If you would like to know more or for special deals, please go to our website at Kids Archery Set.

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Eco Friendly Products – Biofuel Coming From Wastewater And Green Electric Power

Wednesday, July 21st, 2010

Eco friendly products are being developed by researchers in universities through the globe. Scott Banta, a chemical engineering professor at Columbia University’s Fu Foundation School of Engineering and Applied Science, has won a federal grant to come up with a microbe that can produce the particular biofuel butanol by growing on carbon dioxide and ammonia. The carbon dioxide will occur from ambient air, certainly not fossil fuels, plus the ammonia will come from wastewater or it may be generated through a chemical procedure using sustainably generated electricity.

The use of bacteria to produce environmentally friendly power is under intensive development, both to create bio fuels and to produce electricity in the form of microbial fuel cells, an area which the U.S. Navy has already caught on to. Banta says that using an ammonia-oxidizing organism makes this particular project distinctive. It also requires one of those sustainability twofers which all of us love: while helping the U.S. move away from the increasing risks of traditional fuel harvesting, it furthermore might also help get back and recycle wastewater.

Sustainable Butanol

Professor Banta will work together with Kartik Chandran, an assistant professor of earth and environmental engineering who among some other disciplines has studied emissions coming from certain kinds of sewage treatment procedures, and with Alan West, professor of chemical engineering. The team aspires to make use of genetic engineering to create a new metabolic process regarding a bacterium called N. europaea, which can be generally utilized in wastewater procedure, with the ultimate goal of reducing the price of butanol production. The cost element is important because at this time ethanol has got the advantage on cost, but butanol possesses properties that could make it easier to incorporate straight into the existing distribution and transportation system.

More Money for Lasting Power

A part of President Obama’s American Recovery as well as Reinvestment Act (ARRA) is focused on creating new eco-friendly work opportunities in a number of fields including biofuel production. ARRA is providing $543,000 with regards to Banta’s project, included in a $106 million round of financing with the Department of Energy’s Advanced Research Projects Agency. In addition to the Columbia project, thirty-six other investigation assignments acquired funding, including several centered on microbial electro-biofuel development. That is a drop in the bucket compared to the existing financial aid for oil, gas, as well as coal, but hey you have to start someplace. President Obama has suggested ending those subsidies, and if even part of those money is transferred to sustainable energy research possibly the future years will bring speedier progress.

In case you truly value your future, be eco friendly. We all could do this by choosing eco friendly products and participating in environment friendly activities. We only have one world to exist in so let us stand up for this!

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Study On Eco Friendly Products – Shift Clocks Ahead To Reduce Carbon Emissions

Wednesday, July 21st, 2010

Eco friendly products are getting researched globally in order to save the environment. A peer-reviewed research soon to become published in the journal Energy Policy shows that shifting clocks forward one hour inside Britain would significantly cut carbon pollutants.

The new study by Dr Elizabeth Garnsey of Cambridge University’s Department of Engineering implies that if Brits moved their clocks forward 1 hour for the entire 12 months, the carbon emissions preserved will be the same as having 200,000 vehicles off the road.

“The carbon savings associated with this particular clock shift are substantial, equivalent to the carbon footprint of the particular production of 1,800 plastic bags for every home in Britain every year, or taking approximately 200,000 cars away from the road,” Dr Garnsey claims.

The 10:10 campaign has been pushing for exactly this for some time now. It’s Lighter Later initiative proposes a 1-year trial of this particular idea.

But making this change is not just regarding carbon savings – complementing our everyday schedules along with the sun’s would benefit people in multiple ways.

“Lighter nights help make us more joyful, much healthier and more secure,” Eugenie Harvey, director of 10:10 United Kingdom, said on Sunday, the longest day of the entire year. “But following today the nights will start drawing in again. We are renewing our call to the government for a test of Lighter Later’s proposals.”

Of course, doing this in other countries would certainly reduce carbon emissions and support folks in these other ways also.

Over and above this macro-scale solution, although, if you want to help to reduce your carbon pollutants while living a much healthier life, try and match up your everyday routine with the daily routine of the sun in your town by yourself. I understand this is something I ought to be doing more, and it was in fact my greatest Earth Day resolution. With the days getting shorter again, this becomes more and more crucial.

I think changing the timepieces would be a fantastic move, but we should at least try to carry out our part on our very own if we can.

In case you really value your future, be eco friendly. We all could accomplish this by using eco friendly products and engaging in environment helpful pursuits. We just have one world to live in so let us stand up for this!

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Energy To Cool Things Down With Eco Friendly Products

Wednesday, July 21st, 2010

Eco friendly products are definitely a big help to the environment. Turning on your air conditioning equipment through the summer is now a part of our daily reflexes, along with opening the doors and flipping on the lights. When payments come, though, it is also a chronic, often compulsive reflex to spend hundreds of dollars to electrical power utilities – you could not reside in our own perspiration, in the end, when the temperature outdoors is 100 degrees, could you?

DOE’s National Renewable Energy Laboratory (NREL) has combined 3 traditional methods of cooling off the oxygen into a single creation that could save 50 to 90 % of your monthly electricity bill (on air conditioning). The creation is known as “DEVap” (Desiccant-Enhanced eVaporative air conditioner). Eric Kozubal, one of the brains, stated “The concept is to reinvent cooling, while getting rid of millions of metric tons of carbon from the atmosphere.”

Kozubal additionally asserted that their own DEVap device makes use of three methods to remove warmth from the air: filters, evaporative coolers as well as dessicants. Each of these had been used separately since ages, but nobody thought merging them in such a fashion could save power in these quantities.

DEVap makes use of water along with liquid dessicant (like those silica gel balls present in new shoes, merely liquid) to attract the outside air, exhaust some of it and return cool, dry air to the area getting cooled. These two techniques improve the dehumidification portion, which usually is probably the most energy-eating. An example of a simple evaporative cooler would be a water-soaked bed sheet put in your window, or having a fan blow air to it. The evaporation of water could cause the sheet to reduce temperature and cool the oxygen which hits it. Precisely the same comes about when you shiver if you get out of the sea, even though it’s hot outdoors.

Still, only the application of dessicants as well as evaporative coolers isn’t enough in places with excessive air moisture. Regarding these places, membranes start working. The filters within the DEVap are hydrophobic, meaning water has a tendency to bead up rather than soak through the membranes, exactly like it comes about when water is slipping over a newly shined up car. This enables the membranes to manage the liquid flows within the cooling center. “It is that property which keeps the water as well as the desiccant separated from the actual air stream,” Kozubal said.

All these 3 methods cool the oxygen and dehumidify it in a single stage, without requiring refrigerants. Vintage A/C devices could use CFC of HCFC as the warmth exchanging liquid, which is the majority of the times bad for the environment, because the pipes containing them ultimately stop working and release these kinds of potent greenhouse gases into the atmosphere. One pound of CFC or HCFC in refrigerant-based A/Cs attributes just as much to global warming as 2,000 lbs of carbon dioxide. The DEVap replaces the actual refrigeration period from traditional A/Cs with an absorption cycle that is thermally triggered and which makes use of far less energy.

NREL desires to license the engineering to various industry manufacturers, so that within a few years it will be able to change things radically in how much energy we use to cool our homes and workplaces.

If you definitely value your future, be eco friendly. All of us could accomplish this by using eco friendly products and engaging in environment friendly pursuits. We only have one world to live in so we should stand up for it!

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