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The Basics For Archery Bows

The Basics For Archery Bows

The archery industry offers a wide selection of bows: compound bows, traditional bows, youth bows, take-down bows, and many others.

Each one has advantages and disadvantages and some are suited to one of the three major areas of archery: field archery, archery hunting, or target archery. In addition, archery bows 2013 are made by a ton of different manufacturers.

With all this variety, you might believe that each bow is quite different. In actuality, they all have basically the same parts: string, notches, upper and lower limbs, sight windows, brace height, and an arrow shelf. Compound bows have a few additional parts, specifically cams and cables. These are necessary due to the design of compound bows. Compound bows have become increasing popular because they allow the shooter to hold more weight in their draw. This is because the weight of the draw actually reduces when the shooter is preparing to shoot. This translates into a smoother arrow shot for archers. Traditional bows were the mainstay of the archery industry for many years, before compound bows popularity overtook them. They are still quite useful and offer a farther range shooting than compound bows. Take down bows can take both forms of traditional and compound bows, but there difference is the limbs can be taken off. This makes them great for storage and traveling. Finally, youth bows are designed for younger children and adults with smaller weights to fit their growing frames. They offer younger people an opportunity to grow into the sport from their youth.

Additional parts can be added to any bow to improve your accuracy. This is especially important in target archery. One piece of equipment type are stabilizers. These can be placed on the bow and reduce the vibration of the bow while it is being fired. This helps get off a smoother shot and improves your accuracy. Another common feature on some bows is the use of release aids. These are designed as an alternative to actually gripping the string. This feature allows you to concentrate more on the shot than your draw allowing a more consistent shot.

Armed with the information in this section, you should have a good foundation of the basics of archery bows 2013. With just a little more research, you should be ready to pick the archery bow that is just right for you. http://www.poelang.com/



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回复这个贴子 参考IP地址:没有权限查看 2012-7-15 7:47:00
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Shiyan Qijing Industry & Trading Co., Ltd., Dongfeng Cummins engine supplier

Shiyan Qijing Industry & Trading Co., Ltd. is located at the foot of Wudang Mountain — China Taoist Holy Land —Shiyan City (in Hubei Province), which is the production base of dongfeng commercial vehicle in China. It is an import & export company specializing in production, sales and trade. Dongfeng trucks, Dongfeng Cummins engine supplier.

Our company is dedicated to vehicle sales of Dongfeng commercial vehicle, and the production, processing and sales of Dongfeng commercial vehicle parts. Vehicle products cover full ranges of Dongfeng light, medium and heavy-duty commercial vehicles, including the whole series of Dongfeng vehicles and engineering machinery products, such as truck, dump truck, semi-trailer, oil tank, green spray trucks, garbage truck, concrete mixer truck, bulk cement truck, chemical trucks, vans, buses, chassis, etc.

Regarding Cummins Engine, we mainly specialize in the sales of assembly and spare parts of B, C, L, ISBE, ISDE, ISLE series of DCEC, K19, K39, M11, NT series of CCEC, ISM series of XCEC, and ISF series of BFCEC.

Our products are exported to Africa, Central Asia, Southeast Asia, Russia and other countries and regions.

Our company is the excellent supplier of Dongfeng import & export enterprises, and A class of vendor of Dongfeng Commercial Vehicle Parts Marketing Center.

During the process of providing service for the users of Dongfeng commercial vehicles, our company always adheres to the business philosophy of “sincere service, continuous improvement”, which is widely praised by the users. Our company expects to go ahead hand in hand together with you and create prosperity in the future!http://www.dongfengpart.com/
dongfeng cummins
dongfeng cummins
dongfeng parts



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回复这个贴子 参考IP地址:没有权限查看 2012-7-15 7:51:03
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Hot Zone Design for Vacuum Furnaces

Hot Zone Design for Vacuum Furnaces

Insulation/Heat Shield

Molybdenum and graphite are also used for vacuum-furnace insulation. In an all-metal hot zone the heat-shield package is made up of multiple layers of sheet metal with spaces between each layer (Fig. 3). In a standard furnace with a maximum 1315°C (2400°F) operating temperature, the heat shielding often consists of two layers of molybdenum sheet backed by three layers of stainless steel sheet. For higher operating temperatures, the number of molybdenum layers is increased as well as the thickness of each layer. For very high operating temperatures over 1650°C (3000°F), tantalum sheet can be used in place of molybdenum. The insulating properties of the all-metal design come mostly from the gaps between the layers of sheet metal. These gaps prevent heat from being conducted outward from the hot zone. The reflectivity of the inner molybdenum sheet also helps to direct the radiant heat from the elements inward toward the load. All-metal hot zones tend to be preferred when high-vacuum or very clean processing environments are required (medical-component processing). Care must be taken in operating furnaces with all-metal hot zones because molybdenum embrittles due to recrystallization after a single exposure to temperatures above about 1150°C (2100°F). Embrittled heat shields can be relatively easily damaged if struck by fixtures or parts. Due to the high cost of molybdenum, all-metal hot zones also tend to be more expensive than some other choices.

Another popular heat-shield design incorporates graphite-based materials. A standard graphite insulation package normally consists of a minimum thickness of 1.5 inches of graphite-based material in the form of layers of blanket or board. An inner face of graphite foil or foil-bonded carbon composite is added to enhance reflectivity. Because the insulating material is itself porous and permeable, no spaces are required between the layers. These graphite-based materials have excellent insulating properties, are usually cheaper than metal heat shielding and are very easy to work with. Graphite blanket has some advantages over graphite board in terms of construction cost, durability and ease of maintenance.

New Hot-Zone Design

Through production experience, the manufacturer had determined that all-metal insulation does not stand up well in aggressive brazing environments. As condensed metallic constituents from the brazing filler metal build up, the metal insulation begins to curl and crack due to differential expansion between the insulation and the deposit from the filler metal. This eventually causes a deterioration of the hot zone’s insulating properties. Metal insulation is also particularly vulnerable to braze-alloy spillage. Molten braze alloy will often dissolve metal shielding, leaving holes through which heat can escape. The use of thicker sheet and special molybdenum alloys in the insulation will extend the life of an all-metal hot zone but also add considerable expense.

As a manufacturer and user of vacuum furnaces, VAC AERO needed a hot zone designed to withstand aggressive brazing applications and therefore decided to evaluate the performance of graphite-based insulation and heating elements. Tests confirmed that a properly maintained hot zone incorporating these materials can be used to successfully and consistently join difficult-to-braze materials such as nickel-based superalloys. Indeed, the results were better than anticipated. The hot-zone insulation consisted of three layers of graphite blanket with an inner face of foil-bonded carbon composite. While there is little doubt that graphite insulation is more likely to absorb moisture than metal insulation, regular burn-out cycles will rid the insulation of moisture and contaminants that are detrimental to the brazing process. The heating elements were lightweight, curved graphite. http://www.hscf-group.com/


graphite insulation
graphite insulation
graphite insulation



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回复这个贴子 参考IP地址:没有权限查看 2012-7-15 7:53:33
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New carbon-carbon composite breaks through the cost barrier

New carbon-carbon composite breaks through the cost barrier

Although widely used for aircraft and F1 brakes because of their lightness and energy absorption, carbon-carbon composites are currently extremely expensive due to the time spent making them. However, a new wet processing method developed by Freno Huntercombe allows them to be produced in a fraction of the time.

The current method of making carbon-carbon composites is to react a carbon fibre pre-form with a mixture of gases in a furnace, thus depositing carbon in the interstices. Since this normally takes between 500 and 800 hours, the resulting material is very expensive.

While F1 cars usually use a new set of brake linings for each race, aircraft brakes have to endure 2000 to 4000 landings. An Airbus A380 has 16 sets of brakes at a cost of approximately £20,000 to £30,000 per brake, making them a major cost item. According to Boeing, use of carbon-carbon composite brakes enables weight savings relative to steel brakes that range from 250kg on a Boeing 737-600 or 700 to 443 kg on a MD-10 freighter. Naturally, this allows more passengers and/or freight to be carried or fuel consumption to be reduced.

The breakthrough achieved by Freno Huntercombe is the development of a process in which the carbon fibre pre-form is infiltrated by carbon nanoparticles in a water-based suspension. These are followed by ceramic particles that are then reacted to produce a phosphate ceramic. This takes 20 to 30 minutes, meaning composite brakes can be produced at a similar cost to cast iron and steel equivalents.

The compressive strength of the material, according to research director Dr John White, is 100 to 120MPa, which is about the same as that of carbon-carbon fibre composite brakes made by the chemical vapour deposition route. However, as managing director Martin Murphy points out: "Unlike F1 brakes, because ours is a ceramic, wear is low and cold and wet performance is excellent." http://www.hscf-group.com/ProductView.asp?ID=33


carbon-carbon composites
carbon-carbon composites
carbon-carbon composites



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Enhanced performance of a Bi-modified graphite felt

Enhanced performance of a Bi-modified graphite felt

Abstract

graphite felt modified with nanodispersed bismuth was studied as electrode in the positive half-cell of a vanadium redox flow battery (VRFB). The felt was easily modified by immersion in a Bi2O3 solution followed by thermal reduction at 450 °C in air. Despite the low metal content (1 at.%) on the surface of the fibers, the Bi-modified felt showed an excellent electrochemical performance (at 1 mV s? 1) in terms of anodic and cathodic peak current densities (21 and 17 mA cm–2, respectively), reversibility (ΔEp = 0.050 V) and overpotential for the V(IV)/V(V) redox reactions. Furthermore, repetitive cyclic voltammetry measurements, at various scan rates, evidenced the long term stability of this material. These results demonstrate that bismuth nanoparticles on the carbon surface act as stable active sites to promote these reactions, and represent a significant step forward towards the development of outstanding electrode materials for VRFB.

Highlights

Bi-modified graphite felt as positive electrode in vanadium redox flow battery. Low Bi content (1%) significantly enhances the electrochemical performance. High peak current densities, reversibility condition and low reaction overpotential. Bi nanoparticles are excellent active sites to promote the vanadium redox reactions. http://www.hscf-group.com/


graphite felt
graphite felt
graphite felt



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回复这个贴子 参考IP地址:没有权限查看 2012-7-15 7:57:49
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graphite felt

graphite felt

Gansu HaoShi Carbon Fiber Co., Ltd.(HSCF) is the leading manufacturer of PAN-based Carbon Fiber in China, HSCF began to research and industrialize in 1994. From our modern production plants in Central GANSU Province, CHINA, there have the China s largest high-temperature Vacuum Furnaces and entire process of production using computer-controlled temperature. The main products include premium high purity Carbon Fiber (HSCF) based of carbon Fiber board, rigid graphite board, graphite felt, graphite insulation cylinders, and carbon-carbon composites(CFC). 70% of manufactured products are exported in more than 30 countries of the world. Mainly used as insulation in high-vacuum and inert atmosphere furnaces. This kind of high-vacuum is widely used for metal heat treatment, meticulous and ceramic sintering, different kinds of crystallization production, producing optical fiber, and sintering monocrystalline silicon for semiconductors. Since these furnaces work at extremely high temperatures, it is necessary to have insulation material that can withstand such high temperatures. Moreover, for energy conserving purposes, quality heat insulation material is the best choice. We pride ourselves in the ability to offer first class technical backup to our customer base, and over the years we have developed close technical partnerships with major fields including Aerospace, Semiconductor, Solar Ingots, Specialist Castings, Metal Composites, Crystal Growing, Hard Metal Sintering, Graphitizing, and the Heat Treat Sectors.

HSCF can also research and develop new carbon materials (including composite materials) for special uses according to clients demands. http://www.hscf-group.com/ProductList.asp?SortID=2


carbon fiber



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回复这个贴子 参考IP地址:没有权限查看 2012-7-15 8:00:23
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Produktion und Aufbau einer Plastikkarte

Produktion und Aufbau einer Plastikkarte

Die Produktion und der Aufbau einer gl?nzend laminierten Plastikkarte ist in mehrere Schritte unterteilt. Maxicard bietet ausschlie?lich laminierte Plastikkarten (Mehrschichtkarten) gem?? der ISO 7810 ff. an. Das Produktionsverfahren ist identisch mit dem einer Kreditkarte. Die Karten bestehen in der Regel aus 4 oder 5 einzelnen Schichten PVC-Folie (Polyvinylchlorid).

Erstellung eines individuellen Layouts

Der Druck des individuellen Layouts für Vorder- und Rückseite erfolgt zun?chst im Offset-, Sieb- oder Digitaldruckverfahren. Die Wahl des Druckverfahrens ist dabei immer abh?ngig vom gewünschten Layout der Karte. Man stellt, je nach Auflagenh?he, zuerst die Vorderseiten im Nutzen auf die PVC-Druckb?gen (z.B. 18er- oder 40er-Nutzen) und gleicherma?en die Rückseiten auf separate B?gen. Schon bei der Erstellung des Kartenlayouts müssen die sp?tere Lage von z.B. Magnetstreifen oder Chipmodulen berücksichtigt werden.

Druck und Trocknung

Die bedruckten B?gen müssen anschlie?end abtrocknen. Die Trocknungszeit ist zum einen abh?ngig vom verwendeten Druckverfahren und zum anderen von der Menge des Farbauftrages. Diese Zeit kann in manchen F?llen sogar einige Tage in Anspruch nehmen. http://www.e-plastikkarten.de/


Plastikkarten
Druck von Plastikkarten
Plastikkarten



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回复这个贴子 参考IP地址:没有权限查看 2012-7-15 8:02:20
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Druck von Plastikkarten

Druck von Plastikkarten

Die Maxicard Startersets beinhalten alles, was Sie für den Druck von Plastikkarten ben?tigen. Drucker, Software, Farbb?nder und Blanko-Plastikkarten - alles ist dabei! Natürlich inklusive unserem erstklassigen maximalen Service.

Thermosublimationsdruck

Der Thermosublimationsdruck ist dem Thermostransferdruck ?hnlich. Kartendrucker setzen das Thermosublimationsdruckverfahren beim 4-Farb-Druck oder Graustufen-Druck ein. Im Gegensatz zum Thermotransferdruck wird das Farbband im Drucker so stark erhitzt, dass die Farbschicht für einen kurzen Moment gasf?rmig wird. Dieser "Farbdampf" schl?gt sich sofort auf der Oberfl?che der zu bedruckenden Plastikkarte nieder. Durch Regulierung der Hitze am Druckkopf kann Einfluss auf die Farbintensit?t genommen werden. Durch diese Feinregulierung kann im YMCK-Farbmodell nahezu jede Farbe erzeugt werden. Durch die unscharfen R?nder der feinen Druckpunke verschmelzen diese in einen nahezu fotorealistischen Ausdruck ohne dabei pixelig oder k?rnig zu wirken. Das Druckverfahren eignet sich somit hervorragend auch zum Druck von Plastikkarten mit Foto.

Farbb?nder für den Thermosublimationsdruck verfügen in der Regel über eine transparente Overlayschicht die vom Kartendrucker über das fertige Druckbild gelegt wird. Diese Schicht schützt den Druck auf der Karte vor sch?dlichen Umwelteinflüssen, haupts?chlich UV-Strahlung. http://www.e-plastikkarten.de/Plastikkarten.htm



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回复这个贴子 参考IP地址:没有权限查看 2012-7-15 8:04:01
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How to Read an ac dc adapter

How to Read an ac dc adapter

Knowing how to read an AC DC adapter is a skill that comes in handy during a variety of home projects. You can easily match power cords to devices by comparing voltage and polarity, and if an adapter is damaged you can use the information to find a replacement

Instructions

1 Identify the voltage. Next to the word "output", you ll see a number with a "V" after it (such as 12V). This is your voltage.

2

Identify the amperage. After the volts, there will be another number with "A" or "mA" after it (such as 3A or 500mA).

3 Find the diagram that shows three circles connected by lines. The center circle will be open on one side. Whichever sign it opens to is the polarity of the tip. If the circle opens to the plus sign, it is tip positive. If it opens to the minus, sign it is tip negative.

4 If possible, compare the information from the ac dc adapter to the device it powers.

5 Check the Input section to determine the voltage it requires from the wall outlet. A rating between 100 and 120 volts denotes standard voltage used in the United States. A rating of 200 to 240 volts denotes voltage used in a foreign country, and the adapter will require a voltage converter to work in the United States. http://www.gme.com.tw/



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Wooden Blinds Vs

Wooden Blinds Vs

Style

blind manufacturers. You can find an abundance of stains and painted finishes to complement your room s decor, based on the type of wood blind you choose. Custom head rails and cornices can be purchased separately, if the blind does not come with an appealing head rail. Most companies offer color matching for optional cornices and head rails so the color harmonizes with or closely resembles the blind. Aluminum blinds come in many different styles and colors, as well as finishes. You can choose from neutral tones with a flat finish or bright-colored blinds with a glossy finish, and any combination thereof. Each aluminum blind has its own built-in head rail, offering a designer look.

Privacy and Light Blockage

Wooden blinds offer an exceptional privacy option versus many other types of blinds. The solid makeup of the wood prevents individuals from even seeing shapes or shadows through the window. Wood blinds do a fair job of blocking light; however, many specialty blind companies offer a no-holes option. No-holes wood blinds, also referred to as routless blinds, have tiny notches on each side of the slat that sits in the blind ladders. When closed, the notches fit flatly against the ladders, preventing any light from breaking through. Aluminum blinds provide some privacy when closed, but may show shadows and silhouettes within a lighted room. Many aluminum blind manufacturers also offer a no-holes feature with the ladder holes located at the top of the blind slat. When the blinds are closed, the bottom of each slat covers the holes of the slat below it, blocking light from the room. http://www.abcblinds.com.tw/



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