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kindsof A pressure test on the Beer Barrel - Subscribe
A pressure test on the Beer Barrel
As the 17th century, when there is no toothpaste tubes, therefore, cast doubt on Blaise Pascal ,1623-1662, the famous French scientist and philosopher whether the proposed Pascal principle, if every morning were wrestling with its function. However, it is certain that many of the hydrostatic stress-related and other effects are escape his attention, first of all is the principle of hydraulic cranes.
How about the Pascal Principle

Long ago, our engineers made use of this type of machine, today, as long as in the parking lot or gas station, you can see the hydraulic crane, use it to exert a child's effort to be able to lift a car. Let us look at how these devices work, and try to produce their own equipment for an experimental use.
At home, making a type of small hydraulic device

With this small machine can be done, "Hercules" (the son of Zeus, Lidawuqiong, heroes who have completed 12 performance) as the cause. Ready for a closed fluid-filled barrel (do not leave the air, because the air under pressure will be compressed), you can begin to demonstrate to your friends. The casks will be filled with the liquid also with a small syringe filled with liquid and small tubes connected together, you will see the latter two are able to instantly shattered barrel. We try to balance an account: a cross-section of 0.5 square centimeters of ordinary syringes, using thumb pressure exerted on the piston is 20 kg (with the scales to test, to achieve this weight is not difficult), the outcome of the pressure actually is 40 atm! few casks to withstand such pressure. Unfortunately, a farmer discovered this phenomenon. He wanted to by a long thin tube that precious wine from their own country farmhouse transported to the low 30 meter hill at the foot of a friend's house. Everything is going well: a friend's house in barrels filled with wine, but then the pressure of the liquid inside the tubes so quickly broken cask of wine soaked the house.

Aerial work platform http://en.wikipedia.org/wiki/Aerial_work_platform
Hydraulic Jacks, Bottle Jacks:
http://www.chinahydraulicjacks.com/carrepairtools-hydraulic_jack.htm
How a hydraulic lift operates: http://wiki.answers.com/Q/How_a_hydraulic_lift_operates
Groups Discussing hydraulic lift| Yahoo! Groups: http://groups.yahoo.com/phrase/hydraulic-lift
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kindsof Why are energy saving lantern Jan 4th, 2010 8:14:39 pm - Subscribe
Why are energy saving lantern

The ordinary incandescent lamp works

The ordinary incandescent light efficiency about 10 lumens per watt or so, life expectancy of about 1,000 hours, it works: When the lamp access circuit, current flows through the filament, the current thermal effects, so that given a continuous visible light and incandescent infrared, this phenomenon can be aware of the filament temperature rose to 700K, as a result of a high temperature when the filament, most of the energy is wasted in the form of infrared radiation, because the filament temperature is high, evaporation is also fast, so life expectancy Great shortened about 1000 hours.

The working principle of energy-saving lamps

Mainly through the energy-saving lamp ballast to the lamp filament heating temperature of about 1160K, the filament began to emit electrons (because the filament on a number of electronic powder coated), electron impact inelastic collisions of argon atoms, argon atoms after the collision Also hit was the energy of mercury atoms and mercury atoms absorb the energy generated after the transition ionization, issued 253.7nm UV, ultraviolet excited light-emitting phosphors, fluorescent lights at work due to the temperature of the filament of about 1160K, the temperature of the work than incandescent 2200K-2700K much lower, so it might also have increased life expectancy, reaching more than 5,000 hours, because it does not exist, as current incandescent heat effect, the energy conversion efficiency of phosphor is also high, reaching more than 50 lumens per watt.

Generally speaking, in the same wattage

In addition to energy-saving lamps white (cold light) in addition, there is still yellow (warm light). Generally speaking, in the same wattage, under an energy-saving 80% energy than incandescent lamps, with an average life expectancy eight times the thermal radiation is only 20%. Non-strict case, a 5-watt energy-saving bright lights can be seen as equal to 25 watt incandescent lamp, 7-watt energy-saving bright lights equivalent to about 40 watts, 9 watts equivalent to about 60 watts.
A compact fluorescent lamp: http://en.wikipedia.org/wiki/Compact_fluorescent_lamp
Energy Saving Light Bulbs, Compact Fluorescent Lamp:
http://www.energysaving-lightbulb.com/products/index.htm
Energy Saving Bulb Calculator – General:
http://www.lightbulbs-direct.com/article/energy-saving/
How energy saving lamp saves energy ?
http://answers.yahoo.com/question/index?qid=20091031074358AAzEwuX
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kindsof The Issue of PP board and PVC sheet Jan 15th, 2010 6:12:47 pm - Subscribe
The Issue of PP board and PVC sheet

PVC board toughness and heat resistance than PP board, electroplating plants and is certainly a good point to heat ah! Specific you may want to send these two vendors like, combined with operating conditions to determine your plant!

PVC hard board panels are not toxic

PP is polypropylene, PP excellent chemical stability, for most acids, alkali, salt, oxidants have significant inertia. For example, at 100 ℃ of concentrated phosphoric acid, hydrochloric acid, 40% sulfuric acid and its salts in solution are stable, and only a handful of strong oxidizing agents such as fuming sulfuric acid, it might make it change. PP non-polar compounds, polar solvents are very stable, such as alcohol, phenol and so on.
PVC board is not a polymer sheet

PVC panels to PVC as raw material, waterproof, moisture-proof, moth. Includes fire-retardant materials, it is safe. PVC board mostly plain-based, but also imitation patterns of imitation marble pattern. Its cross-section of honeycomb-like mesh structure, forming a processing enterprises on both sides of mouth and concave tenon, which is to select the details, request a complete enterprise mouth and concave tenon straight, smooth and bite each other, local fluctuations and there is no height difference between the phenomenon. PVC plates per square meter ranged from 12 to 20 yuan can be described as inexpensive.

Foam filled pvc door panel:
http://answers.yahoo.com/question/index?qid=20090929224504AAFC5nT
PVC Ceiling Panel: http://www.pvcpanel.net/pvcpanels-pvc_ceiling_panel.htm
Tallant Inds Corrugated PVC Panel:
http://www.amazon.com/Tallant-Inds-121310-Seacoaster-Corrugated/dp/B000LNIKF8
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kindsof The nature of bolts and screws What is the difference Jan 15th, 2010 6:14:36 pm - Subscribe
The nature of bolts and screws What is the difference

With regard to screws, bolts, nuts, screws, as well as the definition of stud
A few times "screw" may specifically refer to bolt \ screws are threaded on that part. Nut (nut): nut is a nut, and bolt or screw fastening screw together to play the role of the parts Screw, fastener, is a general term, also known as fasteners or standard parts, screws, including screws, bolts and studs. Stud (stud), the absence of the head, only both ends with a class of external thread fasteners, such as: double-headed stud (double end stud), stud welding (welding stud) and so on. (Sometimes called as a screw, personally think that inappropriate).

General do not mean to say screw fasteners are generally used for transmission.
Screw screw and bolt bolt the difference between the smallest, often confused, the actual specifications are not particularly clear-cut boundaries, but the smaller is called the multi-screw. Such as: self-tapping screws (self-drilling screw), set screws (tapping screw), wood screw (lag screw) and so on. Referred to as the larger screw bolts, such as: hex bolts (hex machine bolt), Peng Zhang bolts (anchors), carriage bolt (carriage bolt) and so on.

But generally speaking, bolts used to connect two objects, usually through the light hole, needs, and nut (nut) with the use of the role of the individual can not afford to connect. Tools for general use wrench. Head mostly hexagonal top, generally larger.
Screw nuts usually do not directly compatible with the two objects (usually connector first drilling, tapping screw), tools in general with a screwdriver (screwdriver), the head mostly word-slot, cross slots, there are many inside and outside the hexagon, typically small.
The interpretation of a data definition:
Bolt: from the head and the screw (in this case refers only to the screw threaded part, and the drive screw is absolutely not a concept) constitute a class of two-part fasteners required to meet with the nut for fastening to connect two with a through-hole parts.

Screw: screw from the head and a class composed of two parts, fasteners, end-use can be divided into three categories - the machine screws, set screws, special-purpose screw.

Screw - Wikipedia, the free encyclopedia: http://en.wikipedia.org/wiki/Screws
Plan Toy Nuts And Bolts :
http://shopping.yahoo.com/ptounge.giflan%20Toy%20Nuts%20And%20Bolts:2002236883
The picture of Hex Nutshttp://www.yinmao-fastener.com/bigproductsimages/hexnuts_209288.jpg
Amazon Silverline Drywall Screws :
http://www.amazon.co.uk/Silverline-955432-3-5-Drywall-Screws/dp/B000T9XO32
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