August 27, 2008

Deoxyribonucleotide. carbon brushes

A deoxyribonucleotide is the monomer, or single unit, of DNA, or deoxyribonucleic acid. Each deoxyribonucleotide is comprised of three parts: A nitrogenous base, a deoxyribose sugar, and one or more phosphate groups. The nitrogenous base is always bonded to the 1′ carbon of the deoxyribose, which is distinguished from ribose by the presence of a proton on the 2′ carbon rather than an -OH group. The phosphate groups bind to the 5′ carbon of the sugar.

When deoxyribonucleotides polymerize to form DNA, the phosphate group from one nucleotide will bond to the 3′ carbon on another nucleotide, forming a phosphodiester bond via dehydration synthesis. New nucleotides are always added to the 3′ carbon of the last nucleotide, so synthesis always proceeds from 5′ to 3′.


External links

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August 25, 2008

Carbonfund. carbon brushes

Carbonfund.org Foundation is a non-profit organization that provides carbon offsetting products to individuals and businesses. Originally, it purchased and retired carbon credits on the Chicago Climate Exchange, of which it is still a member, but now it focuses on projects in renewable energy, energy efficiency and carbon sequestration.


External links

  • Carbonfund.org

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Shaft mining. shaft. Most importantly in

Shaft mining or Shaft sinking refers to the method of excavating a vertical or near-vertical tunnel from the top down, where there is initially no access to the bottom.
When the top of the excavation is surface it is referred to as a shaft, when the top of the excavation is underground it is called a winze.


Off-shaft Access

The mine shaft is used to access to an underground mining facility. Horizontal workings off the shaft are called drifts, galleries or levels, these extend from the central shaft towards the ore body. The point of contact between these levels and the shaft itself is known as the inset, or shaft station.


Surface facilities

On the surface above the shaft stands a building known as the headframe (or poppet head or pit head). Depending on the type of hoist used the top of the headframe will either house a hoist motor or a sheave wheel (with the hoist motor mounted on the ground).
The headframe will also contain bins for storing ore being transferred to the processing facility. If the shaft is used for mine ventilaton a plenum or casing, is incorporated into the headframe to ensure the proper flow of air into and out of the mine.


Shaft lining

In North and South America, smaller shafts are designed to be rectangular with titmber supports. Larger shafts are round and are concrete lined.


Shaft compartments

A mine shaft is split into multiple compartments. The largest compartment is used for the cage, a conveyance used for moving workers and supplies below the surface. It functions in a similar manner to an elevator. The second compartment is the skip, used to transport ore to the surface. Smaller mining operations use a skip mounted underneath the cage, rather than a separate device. The third compartment is used for an emergency exit; it may house an auxiliary cage or a system of ladders. An additional compartment houses mine services such as high voltage cables and pipes for transfer of water, compressed air or diesel fuel.


See also

  • Underground mining (hard rock)
  • Drift mining


Notes and references


External links

  • Abandoned Mine Shafts & Tunnels

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August 24, 2008

Dacheng. being developed again.

Dacheng is a type of martial art developed in China. Like many other forms of fighting (kung fu, karate, jujutsu), it is based on the movements of animals.

Dacheng Quan (”Way of Fist of Dacheng”) was developed in 1965 as a branch of Kung Fu. Today, it is taught in basic military.

The literal translation of Dacheng Quan is “Greatly successful way of the fist” (Da Cheng Quan) (pronounced dah cheng chuan)


External links

  • The official website for Dacheng

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August 21, 2008

Sacagawea River. Montana

The Sacagawea River is a tributary of the Musselshell River, approximately 30 mi (48 km) long, in north-central Montana in the United States. It rises on the plains of northern Fergus County and flows eastward. The river formerly joined the Musselshell five miles above the confluence of the Musselshell with the Missouri, but it now flows into the arm of Fort Peck Lake on the Missouri formed by the mouth of the Musselshell.

The river was explored during the Lewis and Clark Expedition and named after their guide, Sacagawea.


See also

  • List of Montana rivers

http://www.rootsweb.com/~nwa/sacajawea.html
look on this website


External links

  • Naming of the River
  • North Central Montana relief map

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August 20, 2008

Law on the National Arms, Flag, and Anthem. affixed on the

The Law on the National Coat of Arms, Flag and Anthem (Spanish: Ley sobre el Escudo, la Bandera y el Himno Nacionales) is a set of rules and guidelines passed by the Mexican government on the display and use of the flag (bandera), coat of arms (escudo) and the anthem (himno). The original law was passed in 1984 and it contains 7 chapters, a preamble and a section that contains the lyrics of the national anthem. The law itself was changed several times, most recently in 2005.


Chapter One

It consists of two sentences, simply stating that the flag, arms and anthem are the symbols of the country and that this law was established to render honor and respect to the symbols.


Chapter Two

Consisting of three articles, this chapter contains brief discriptions of each national symbol. Article two describes the coat of arms, article 3 describes the flag and explains that the national anthem will be established according to other laws. Each article states that a copy of each symbol will be kept at the General National Archive (Archivo General de la Nación) and the National History Museum (Museo Nacional de Historia).


Chapter Three

Consisting of two articles, this chapter describes how the coat of arms can be made or used. Article 4 states that the coat of arms will be made according to what was stated in Chapter 2 of this law and Article 5 states that certain officials, documents, seals and laws can be affixed with a special coat of arms. The difference with this coat of arms is that the entire arms is black and white, and the words “Estados Unidos Mexicanos” (United Mexican States) appear in a semi-circle at the top of the arms, between the olive branch and the oak wreath. Article 5 also states that the coat of arms can be affixed to vehicles operated by the government, such as vehilces that transport the President of Mexico.


Chapter Four

This chapter, which describes about the national flag in detail, is the longest of the three chapters on each symbol. Consisting of thirty articles, this chapter lists dates on when the Mexican flag is flown and how it is flown, about the various honors that is presented to the flag and the various flag devices that can be used, such as the presidential sash and the corbata.


External

links

  • Law on the National Coat of Arms, Flag and Anthem in www.cddhcu.gob.mx (Camara de Diputados - H. Congreso de la Union webpage) (pdf)
  • Law on the National Coat of Arms, Flag and Anthem (Instituto de Investigaciones Jurídicas de la UNAM) (HTML)

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August 18, 2008

Kinoite. copper wire brushes

Kinoite (Ca2Cu2Si3O10-2H2O) is a light blue copper mineral. It is somewhat scarce. It has a monoclinic crystal system, vitreous luster, and is transparent to translucent. It can be found in the Santa Rita Mountains and the Christmas Mine in Arizona and a few copper mines.


External links

  • mineral.galleries.com

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August 17, 2008

Copper clad steel. Later these copper

Copper clad steel, also known as copper covered steel or by its acronym CCS, is a bimetallic product, mainly used in the wire industry that combines the high mechanical resistance of steel with the conductivity and resistance to corrosion of copper.
Its main purpose is to be used as a drop wire of telephone cables, and inner conductor of CATV cable.
The main producers are located in Argentina[1], Brazil, and USA.


Uses

Groundings, union of ground rods to metallic structures, meshes, substations, power installations and lightning arrestors. This material has proven its aptitude for these purposes. More than 60 years of installations all around the world certify the excellence of this type of installation.


Properties

Among the main properties of these conductors the following should be highlighted:

  • Good corrosion resistance of copper
  • High mechanical strength
  • High resistance against material fatigue
  • Lower electrical resistance compared to steel wire
  • Much lower impedance at high frequencies than that of steel conductors


Advantages

Note: A valid reference for the following claims would greatly improve their usefulness. See discussion page.

Due to the inseparable union of the two metals it is “theft proof” because it is not possible to
recuperate the copper and as such the conductor has no scrap value. Thus the frequent robberies so
common with pure copper conductors is avoided. The installation with copper steel conductors are
safe and fulfills the required specifications of a good grounding. For this reason it is used with
preference by utilities and oil companies.


See also

Copper alloys

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August 16, 2008

Drum stick. brushes are slowly abraded

This article is about the musical tool. For more meanings, see Drumstick (disambiguation).

A drum stick or drumstick is an object used to strike drums and other percussion instruments to produce sound. Some specialized drum sticks are called beaters, mallets, or brushes.


Snare drum sticks

Snare drum sticks are usually made of wood, often hickory, oak or hard maple. Other used materials include aluminum (covered with a PVC sleeve to avoid damage to cymbals), fiberglass, nylon, acrylic, plastic, and carbon fibre. A typical drum stick is around 1.5cm in diameter and 41cm long, although drummers have a wide range of shapes and sizes to choose from. Many drummers are very particular about the exact shape, size, weight, balance, density, and grain of their sticks. All of these qualities attribute to the “feel” and sound of the stick.

Snare drum sticks may be designed for use in particular performance contexts. Sticks that are smaller in diameter or balanced farther towards the tip may be intended for orchestral playing that requires fine control and soft dynamics. Sticks for street playing (e.g. drum corps and marching bands) are almost always thick and weighty, to promote extended production of sound at extreme dynamics. There are different sizes of drum sticks for each situation, designated by a letter and number, e.g. 2b and 5b are thicker, while 5a and 7a are smaller.


Anatomy of a snare drum stick

The drum head is (usually) struck with the tip of the drum stick. Tips come in many shapes, such as acorn, barrel, oval and round. The tip is sometimes referred to as the bead. Traditionally, the tip is made of the same piece of wood as the rest of the stick, although there are drum sticks with a plastic nylon tip conceived by Joe Calato in Niagara Falls, NY in 1958 and the newer acetal tip, conceived by Ken Drinan and Paul Kiersted in the 1970s. The acetal tip produces a brighter sound when playing cymbals and is less likely to splinter after sustained or violent use. However, it is prone to cracking or flying off.

Immediately below the tip is shoulder of the stick, which tapers out. The rest of the stick is referred to as the shaft, with the butt at the opposite end to the tip. This section of the stick is prone to breaking after or during cymbal use or during rim shots.

Players use two sticks, employing either a matched grip, popularised by Ringo Starr in the 1960s or a traditional grip, popularised by Sanford A. Moeller from talks with American Civil War drummers/veterans. With either grip, players keep the balance point of the stick slightly beyond their hands.


Holding the Drumsticks

see;

  • Traditional grip
  • Matched grip


Major Drum Stick Companies

  • Vic Firth
  • Vater
  • Regal Tip
  • Zildjian
  • Pro-Mark
  • Shaw X
  • Innovative Percussion


Mallets

A mallet comprises a head connected to a thin shaft. Unwrapped mallets, used on glockenspiel, xylophone and other instruments with keys made of durable material, have heads made of brass, kelon, nylon, acrylic, wood, or other hard materials; wrapped mallets, used on marimba, vibraphone and other instruments with softer keys, have heads of kelon, nylon, acrylic or other medium-hard materials wrapped in softer materials like yarn, cord or latex. Mallet shafts are commonly made of rattan or birch.

Different mallets are used primarily to alter the timbre of the mallet instrument being played. Typically, softer or thicker mallets are used on an instrument’s lower registers and harder, thinner mallets used on higher registers. Mallet choice is typically left up to the performer, though some compositions specify if a certain sound is desired by the composer.

Players frequently employ two mallets in a matched grip or four mallets in a four-mallet grip; however, use of up to six mallets is not uncommon. More than two mallets may be used even when no chords are called for by the composer so that the performer has a wider range of timbres from which to select or to facilitate performance of music that moves rapidly between high and low, and if hit properly can switch between the two pitches.


Brushes

Brushes are a set of bristles connected to a handle so that the bristles make a rounded fan shape. The bristles can be made of metal or plastic; handles are commonly made of wood or aluminum, and are often coated with rubber. Some brushes are telescoping, so that the bristles can be pulled inside a hollow handle and the fan made by the bristles can be of variable length, width and density. Retracting the bristles also protects the brush when it is not being used. The non-bristled end of the brush may end in a loop or a ball. Though most performers prefer using metallic brushes, more now use plastic brushes because of their increased durability.

Brushes add texture and sound not possible with sticks. For instance, silky swish sounds on coated heads and the delicate “ting” sound on cymbals are only possible with thin wire or nylon brushes.


Timpani mallets

See Timpani.


External links

  • Traditional letter/number scheme for snare drum stick model names.

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August 10, 2008

Momentum theory. rotor have to

The momentum theory or Disk actuator theory is a theory describing a mathematical model of an ideal propeller or helicopter rotor, by W.J.M. Rankine (1865), Alfred George Greenhill (1888) and R.E. Froude (1889).

The rotor is modeled as an infinitely thin disc, inducing a constant velocity along the axis of rotation. The basic state of an helicopter is hovering. This disc creates a flow around the rotor. Under certain mathematical premises of the fluid, there can be extracted a mathematical connection between power, radius of the rotor, torque and induced velocity. Friction is not included.

The power required to produce a given thrust is:

<math>P = \sqrt{\frac{T^3}{2 \rho A}}</math>

Where:

  • T is the thrust
  • <math>\rho</math> is the density of air (or other medium)
  • A is the area of the rotor disc


See also

  • Blade element theory
  • Circulation Theory
  • Strip theory for fixed wing aerodynamics
  • Conway non linear momentum theory
  • Kutta-Joukowski Circulation


External links

  • Momentum theory (Froude)

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List of asteroids/112001–113000. seen wide implementation. edit

! colspan=”5″ style=”background-color:silver;text-align:center;” id=”001″| 112001–112100 [ edit]

! colspan=”5″ style=”background-color:silver;text-align:center;” id=”101″| 112101–112200 [ edit]

! colspan=”5″ style=”background-color:silver;text-align:center;” id=”201″| 112201–112300 [ edit]

! colspan=”5″ style=”background-color:silver;text-align:center;” id=”301″| 112301–112400 [ edit]

! colspan=”5″ style=”background-color:silver;text-align:center;” id=”401″| 112401–112500 [ edit]

! colspan=”5″ style=”background-color:silver;text-align:center;” id=”501″| 112501–112600 [ edit]

! colspan=”5″ style=”background-color:silver;text-align:center;” id=”601″| 112601–112700 [ edit]

! colspan=”5″ style=”background-color:silver;text-align:center;” id=”701″| 112701–112800 [ edit]

! colspan=”5″ style=”background-color:silver;text-align:center;” id=”801″| 112801–112900 [ edit]

! colspan=”5″ style=”background-color:silver;text-align:center;” id=”901″| 112901–113000 [ edit]

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August 6, 2008

ER200. commutator.

The ER200 was a Russian electric train. It was the first high-speed Direct Current intercity Electric Multiple Unit (EMU) with rheostatic brake.
There were two designs. First in 1974 came the ER200-1 EMU which went into commercial operation in 1984. A 1992 design went into operation between Sankt-Peterburg and Moscow in 1996.


Overall trainset description

Supplier RVR
First supplied 1974
Type IC / IR
Maximum speed, km/h 200
Line voltage, V 3000
Main configuration DT+4(Mp+M)+DT / DT+3(Mp+M)+DT
Single unit configuration (options) Mp+M (M+Mp+DT)
Number of seats 544 / 416
Train weight, t 557.4 / 442.4
Coach weight ( DT / M / Mp ), t 48.7 / 56.5 / 58.5
Gauge, mm 1520


Body

Supplier RVR / KVZ
Length, mm 26000
Width, mm 3130
Height, mm 4200
Distance between suspensions, mm 18800
Number of input doors in coach 4
Number of seats ( DT / M ) 16 / 64


Bogies

Supplier RVR
Distance between axles ( M / T ), mm 2500 / 2500
Weight ( M / T ), t 12.5 / 8.06
Wheel diameter ( M / T ), mm 950 / 950
Number of motor bogies under the M-car 2
Number ot TM in M-bogie 2
Gear ratio 2.346
Traction Motor (TM)
Supplier RER
Type DC commutator
Model 1DT-001
One-hour power, kW 240
Continue power, kW 215
Voltage, V 750
Continue current, A 285
Max field weakening, % 20.0
Wheel force, kN 8.9
Weight, kg 1320


Main circuit electric equipment

Supplier RER
Control mode rheostatic step control + TCH
Traction converter Thyristor DC chopper (TCH)
Mounting place under floor Mp
Semiconductors Thyristors TB353-630-16
Number of semiconductors 20
Nominal output voltage, V 3000
Modulation frequency, Hz 400
Cooling system self-ventilated
Number of TM in unit 8
Number of TM sequences 2
Electric brake rheostatic


Auxiliary electric equipment

Supplier RER
Converter type rotating machine
Model 1PV.004
Input voltage, V 3000
Output voltage, V 3×220
Power, kW 75.0
Battery voltage, V 110


Operational performance

Operator(s) Ok
Route length, km 650
Commercial speed, km/h 130.0
Acceleration (0-60 km/h), m/s2 0.4
Decceleration (80-0 km/h), m/s2 0.4

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August 5, 2008

Tenable. edit See Also edit

Wikipedia does not currently have an encyclopedia article for ‘.

You may like to search Wiktionary for “[[Wiktionary:Special:Search/|]]” instead.

To begin an article here, feel free to [ edit this page], but please do not create a mere dictionary definition.

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August 4, 2008

Hanke. External links Article in

Hanke is a surname of German origin.


People

  • Henriette Hanke née Arndt (1785-1862), German writer; See German article
  • Jan Alois Hanke (1751-1806), Bohemian humanist, writer in Czech and German; See German article
  • Karl Hanke, (1903-1945), Nazi Party official
  • Mike Hanke (b. 1983), German football player
  • Stephan Hanke (b. 1972), German soccer player; See German article
  • Steve H. Hanke, economist
  • Thaddäus Haenke (1761-1816), explorer


See also

  • Henke

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August 2, 2008

Grommet. are slowly abraded

For the animation character, see Wallace and Gromit.

Grommets and eyelets are metal, plastic, or rubber rings that are inserted into a hole made through another material. They may be used to reinforce the hole, to shield something from the sharp edges of the hole, or both.


Grommets as reinforcement or crafting

Grommets are used to reinforce holes in leather, clothing, shoes, and other fabrics. They can be made of metal or plastic, and are easily used in common projects, requiring only the grommet itself, a grommet-setting tool (a metal rod with a convex tip usually sold with the grommets), and a hammer. Higher end grommet presses (as shown in the picture) exist as well, though generally a hammer and the grommet-setting tool is equally effective for small projects. Their most common usage is to strengthen the holes for bootlacing but they are also good for making corsets and other laced clothing, plus curtains and other household items that require hanging from hooks. The grommet prevents the cord from tearing through the hole, thereby providing structural integrity. Small grommets are also called eyelets, especially when used in clothing or crafting. When using eyelets for crafting, they are generally used decoratively.


Grommets used as shielding

If metal or another hard material has a hole made in it, the hole may have sharp edges. Electrical wires, cord, rope, lacings, or other soft vulnerable material passing through the hole can become abraded or cut, resulting in damage. Rubber, plastic or plastic coated metal grommets are each used to avoid this. The smooth and sometimes soft inner surface of the grommet shields the wire from damage.

Grommets are generally used whenever wires pass through punched sheet metal for this reason. Molded and continuous strip grommets are manufactured in a wide variety of sizes and lengths expressly for this purpose; they are usually a single piece which can be inserted by hand. Two-piece hard plastic devices are available which also grip the wire that passes through; this is called strain relief and is often used on power supply cords that attach to a piece of equipment, to prevent a tug on the wire from stressing the electrical connections inside the equipment.


Surgical grommets

A grommet can also be a small teflon tube inserted into the eardrum to allow air to pass through it into the middle ear to alleviate the hearing loss and pain that can occur with repeated ear infections, a condition sometimes known as glue ear. This is also a correcting measure for a patulous Eustachian tube (when air moves to and from the middle ear with each breath making the eardrum flap).


See also

  • Stent
  • Tympanostomy tube

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July 29, 2008

Shaft. shaft and springs press

Shaft can refer to:

In fiction:

  • A 1971 novel by Ernest Tidyman about an African-American private detective

    • Shaft (1971 film), a film based on the novel

      • Shaft (album), the soundtrack for the film, recorded by Isaac Hayes
      • the “Theme from Shaft”, performed by Isaac Hayes
    • Shaft’s Big Score, the second film in the trilogy
    • Shaft in Africa, the third film in the trilogy
    • Shaft, a sequel of the 1971 film, released in 2000
    • Shaft (television), a series of TV movies
    • John Shaft, the title character of the above films
  • Drive Shaft, a fictional rock band led by Charlie Pace in the TV series Lost
  • Shaft (comics), a Marvel Comics ninja character
  • Shaft (Castlevania), the dark priest from the Castlevania videogame series
  • a weapon in the Quake video game series
  • Shaft (youngblood) comic book character

music:

  • Shaft (band), a dance music act which had a 1999 hit with a cover/remix of (Mucho Mambo) Sway
  • Shaft (New Zealand band), a New Zealand indie band
  • Shaft (club), a blues and jazz club in Istanbul, Turkey

Other:

  • the shaft of a pole weapon
  • Elevator shaft
  • Ventilation shaft
  • Shafting, illict travelling through shafts
  • Shaft mining
  • Pitch (vertical space), a significant underground vertical space in caving terminology
  • Axle, a central shaft for a rotating wheel or gear
  • Driveshaft, a mechanical device for transferring power from the engine or motor to where it is wanted
  • an architectural column’s long cylindrical section
  • the part of a golf club (equipment) between the head and the grip
  • the height of a boot
  • part of a loom
  • a slang word for a penis
  • Shaft (company), a Japanese animation company

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July 21, 2008

Light-independent reaction. were replaced with carbon

In photosynthesis, the light-independent reactions, also somewhat misleadingly called the dark reactions (they don’t require darkness, but they do require the products of the light reactions), are chemical reactions that convert carbon dioxide and other compounds into glucose. It occurs in the stroma, the fluid filled area of a chloroplast outside of the thylakoid membranes. These reactions, unlike the light-dependent reactions, do not need light to occur; hence the term dark reactions. These reactions take the products of the light-dependent reactions and perform further chemical processes on them. There are two light-independent reactions: carbon fixation and the Calvin-Benson cycle.

However in CAM (Crassulacean acid metabolism) plants, carbon fixation actually does take place at night.


Carbon fixation

Main article: carbon fixation

The carbon fixation reaction is the first step of the light-independent reactions. Carbon from carbon dioxide is “fixed” into a larger carbohydrate. Three pathways to occur: C3 carbon fixation (the most common), C4 carbon fixation, and CAM (Crassulacean Acid Metabolism). C3 fixation occurs as the first step of the Calvin-Benson cycle in all plants. C4 plants first fix carbon dioxide into malate, which is then used to supply carbon dioxide in the middle of the night to the Calvin-Benson cycle. CAM plants perform a similar process.


Calvin cycle

The Calvin-Benson cycle takes carbon dioxide and converts it to glucose, which the plant uses for energy.


External links

  • The Biochemistry of the Calvin Cycle at Rensselaer Polytechnic Institute

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July 19, 2008

BBC TV Europe. were replaced

BBC TV Europe was a BBC subscription-funded television service founded in 1987 serving continental Europe. It was available on satellite and cable.

The channel broadcasted a mix of programmes shown on BBC One and BBC Two in the United Kingdom, as well as the BBC’s domestic Six O’Clock News bulletin together with the regional news service from London. When a programme on BBC One could not be shown on the channel for rights reasons, this would be replaced with a programme shown on BBC Two.

In 1991, the channel was replaced by BBC World Service Television, which was later replaced itself by BBC World and BBC Prime in 1995.

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Ernest Tidyman. rotating shaft. Most importantly

Ernest Tidyman (January 1 1928 - July 14 1984) was a Cleveland-born American author and screenwriter, best known for his novels featuring the African-American detective John Shaft. He also co-wrote the film version of Shaft with John D.F. Black in 1971.

His screenplay for The French Connection garnered him an Academy Award for Best Adapted Screenplay, as well as a Golden Globe Award, a Writers Guild of America Award, and an Edgar Award.

He also wrote the screenplay for the 1973 film High Plains Drifter, which was directed by Clint Eastwood, who was also its star. Tidyman also wrote the less successful sequel to Shaft, Shaft’s Big Score which appeared in theaters in 1972.

In 1974, he published Dummy, a non-fiction account of the story of an accused deaf-mute murderer. It was nominated for an Edgar in the Fact Crime category.

He co-wrote A Force of One in 1979, one of Chuck Norris’s earlier films.

Thereafter, Tidyman never attained the kind of success he enjoyed with The French Connection and the Shaft series, although he had a high note in 1980 with his teleplay for the TV movie (which he also had a hand in producing), which garnered him an Emmy nomination. For creating the Shaft books, he became one of the few white individuals to win an NAACP Image Award.

In 1982, he married former Motown soul singer Chris Clark, who had co-written the screenplay for Lady Sings the Blues (1972). He died two years later from a perforated ulcer.


Filmography

  • The French Connection (1971)
  • High Plains Drifter (1973)

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July 18, 2008

Turbo-electric. or electric generator the

A turbo-electric transmission uses electric generators to convert the mechanical energy of a turbine (steam or gas) into electric energy and electric motors to convert it back into mechanical energy to power the driveshafts.

Turbo-electric drives are used in some locomotives (gas turbines, e.g. with the first TGV) and ships (steam and sometimes gas turbines). The advantage of the turbo-electric transmission is that it allows the adaptation of high-speed turning turbines to the slow turning propellers or wheels without the need of a heavy and complex gearbox.

A disadvantage shared with the more common diesel-electric powertrain is that because of the double conversion of mechanical energy to electricity and back more energy gets lost than with a mechanical transmission. Gas turbine are however usually less energy efficient than equally sized diesel engines. Efficiency can be increased, if the exhaust gases of the gas turbine is used to generate steam which powers a steam turbine (Combined cycle/Combined gas and steam).


See also

  • Gas turbine-electric locomotive
  • Steam turbine-electric locomotive


Ships With Turbo-Electric Drive

  • SS Canberra- most powerful steam turbo-electric units in a passenger ship, 42,500 shp per shaft, 2 shafts
  • USS Langley(CV-1)
  • Lexington class aircraft carriers
  • USS New Mexico (BB-40)
  • Colorado class battleship
  • USS Glenard P. Lipscomb (SSN-685)
  • SS Normandie- most powerful steam turbo-electric passenger ship ever, 40,000 shp per shaft (50,000 shp at max power), 4 shafts
  • RMS Queen Mary 2- powered by General Electric gas turbines in addition to her diesel generators to produce the power to drive her four Rolls-Royce MerMaid electric podded azimuth thrusters.
  • GTS Millennium


External links

  • Turboelectric drive in American Capital Ships @ www.navweaps.com

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Ōbaku (school of Buddhism). called brushes.

Ōbaku (Japanese. Chinese 黃檗; pinyin huang bo) is a Japanese Zen Buddhist school. It was founded in 1654 when the Chinese monk Yinyuan Longqi and his disciple Muyan, followers of the Linji tradition, went to Japan. The head temple Mampukuji was founded at Uji in 1661. In 1664 Muyan replaced Yinyuan Longqi as chief priest there. In 1671 he established a second temple, Zuishōji at Shirokane, Edo. Chinese monks remained master of the temple for the first thirteen generations, until the Japanese monk Ryūtō became the fourteenth.

Ōbaku monks were famed for their skill at calligraphy, and three of them, Ingen Ryuki, Mokuan Shoto and Sokuhi Nyoitsu were known as the “Three Brushes of Ōbaku” or Obaku no Sanpitsu.


Famous Ōbaku monks

  • Ingen Ryuki
  • Mokuan Shoto
  • Sokuhi Nyoitsu
  • Tetsugen


See also

  • Kōfuku-ji (Nagasaki)
  • Zen
  • Japanese Buddhism
  • Mount Huangbo

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July 17, 2008

Selectable Mode Vocoder. between stationary wires

Selectable Mode Vocoder (SMV) is speech coding standard used in CDMA2000 networks. SMV provides multiple modes of operation that are selected based on input speech characteristics.

The SMV for Wideband CDMA is based on 4 codecs: full rate at 8.5 kbit/s, half rate at 4 kbit/s, quarter rate at 2 kbit/s, and eighth rate at 800 bit/s. The full rate and half rate are based on the eXtended CELP (eX-CELP) algorithm that is based on a combined closed-loop-open-loop-analysis (COLA). In eX-CELP the signal frames are first classified as:

  • Silence/Background noise
  • Non-stationary unvoiced
  • Stationary unvoiced
  • Onset
  • Non-stationary voiced
  • Stationary voiced

The algorithm includes voice activity detection (VAD) followed by an elaborate frame classification scheme. Silence/background noise and stationary unvoiced frames are represented by spectrum-modulated noise and coded at 1/4 or 1/8 rate. The SMV uses 4 subframes for full rate and two/three subframes for half rate. The stochastic (fixed) codebook structure is also elaborate and uses sub-codebooks each tuned for a particular type of speech. The sub-codebooks have different degrees of pulse sparseness (more sparse for noise like excitation). SMV scores a high of 4.1 MOS at full rate with clean speech.

The coder works on a frame of 160 speech samples (20 ms) and requires a look ahead of 80 samples (10 ms) if noise-suppression option B is used. An additional 24 samples of look ahead is required if noise-suppression option A is used. So the algorithmic delay for the coder is 30 ms with noise-suppression option B and 33 ms with noise-suppression option A.

The next evolution of CDMA speech codecs is VMR-WB which provides much higher speech quality with wideband while fitting to the same networks.


References

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Transportation coils. coils

The Transportation Coils series is a set of definitive stamps issued by the United States Postal Service between 1981 and 1995. Officially dubbed the “Transportation Issue” or “Transportation Series”, they have come to be called the “transportation coils” because all of the denominations were issued in coil stamp format.

The theme of the series was historical transportation vehicles used in the United States since its independence. The designs are spare, consisting only of the vehicle itself, and with inscriptions describing the general type (”Circus Wagon” or “Ferryboat”) and a date, either a decade or sometimes a specific year. The stamps are primarily engraved, almost all in a single color on plain white paper (the $1 seaplane is in two colors). Some of the denominations also received special service inscriptions in black, such as “Bulk Rate” or “ZIP + 4 Presort”. Many of those denominations were unusual fractional rates, such as 16.7 or 24.1 cents, used by bulk mailers and other businesses.

Because of their heavy use by businesses mailing to households, vast quantities of these were produced, and were a common sight in the daily mail of the 1980s and 1990s.

The series has become popular with stamp collectors, both because of the “classic” engraved designs, and because to the emergence of Plate number coil collecting. Many issues with specific plate numbers are hard to find and can be valuable.

Stamps of the series (ordered by denomination, not issue date):

  • 1¢ Omnibus
  • 2¢ Locomotive
  • 3¢ Handcar
  • 3¢ Conestoga
  • 3.4¢ School Bus
  • 4¢ Stagecoach
  • 4¢ Steam Carriage
  • 4.9¢ Buckboard
  • 5¢ Motorcycle
  • 5¢ Milk wagon
  • 5¢ Circus wagon
  • 5¢ Canoe
  • 5.2¢ Sleigh
  • 5.3¢ Elevator
  • 5.5¢ Star Route Truck
  • 5.9¢ Bicycle
  • 6¢ Tricycle
  • 7.1¢ Tractor
  • 7.4¢ Baby Buggy
  • 7.6¢ Carreta
  • 8.3¢ Ambulance
  • 8.4¢ Wheel Chair
  • 8.5¢ Tow Truck
  • 9.3¢ Mail Wagon
  • 10¢ Canal Boat
  • 10¢ Tractor Trailer
  • 10.1¢ Oil Wagon
  • 10.9¢ Hansom Cab
  • 11¢ Caboose
  • 11¢ Stutz Bearcat
  • 12¢ Stanley Steamer
  • 12.5¢ Pushcart
  • 13¢ Patrol Wagon
  • 13.2¢ Coal Car
  • 14¢ Iceboat
  • 15¢ Tugboat
  • 16.7¢ Popcorn Wagon
  • 17¢ Electric Auto
  • 17¢ Dog Sled
  • 17.5¢ Racing Car
  • 18¢ Surrey
  • 20¢ Fire Pumper
  • 20¢ Cable Car
  • 20¢ Cog Railway
  • 20.5¢ Fire Engine
  • 21¢ Railway Mail Car
  • 23¢ Lunch Wagon
  • 24.1¢ Tandem Bike
  • 25¢ Bread Wagon
  • 32¢ Ferry Boat
  • $1 Sea Plane


References

  • Scott catalog

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July 14, 2008

Native copper. copper or

Copper, as native copper, is one of the few metallic elements to occur in uncombined form as a natural mineral, although most commonly occurs in oxidized states and mixed with other elements. Native copper was an important ore of copper in historic times and was used by pre-historic peoples.

Native copper occurs as rarely isometric cubic and octahedral crystals, but more typically as irregular masses and fracture fillings. It is a copper-red color on fresh surfaces, but typically is weathered and coated with a green tarnish of copper(II) carbonate. Its specific gravity is 8.9 and the hardness is 2.5.

The mines of the Keweenaw native copper deposits of Upper Michigan were major copper producers in the 19th and early 20th centuries, and are the largest deposits of native copper in the world. (Web archive; click cancel when it asks for authentication.) Native Americans mined copper on a small scale, and evidence exists of copper trading routes throughout North America among native peoples, proven by isotopic analysis. The first commercial mines in the Keweenaw Peninsula (which is nicknamed the “Copper Country”) opened in the 1840s. Isle Royale in western Lake Superior, was also a site of many tons of native copper. Some of it was extracted by native peoples, but only one of several commercial attempts at mining turned a profit there.

Another major native copper deposit is in Corocoro, Bolivia.

The name copper comes from the Greek kyprios, of Cyprus, the location of copper mines since pre-historic times.


References

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July 11, 2008

Barlow’s Wheel. electric motor an alternator

Barlow’s Wheel is the name given to an early demonstration of a homopolar motor, designed and built by English mathematician and physicist, Peter Barlow in 1822. An electric current passes through the hub of the wheel to a mercury contact on the rim; this is contained in a small trough through which the rim passes. Due to health and safety considerations brine is sometimes used today in place of mercury. The interaction of the current with the magnetic field of a U-magnet causes the wheel to rotate. The presence of serrations on the wheel is unnecessary and the apparatus will work with a round metal disk, usually made of copper.

“The points of the wheel, R, dip into mercury contained in a groove hollowed in the stand. A more rapid revolution will be obtained if a small electro-magnet be substituted for a steel magnet, as is shown in the cut. The electro-magnet is fixed to the stand, and included in the circuit with the spur-wheel, so that the current flows through them in succession. Hence the direction of the rotation will not be changed by reversing that of the current; since the polarity of the electromagnet will also be reversed.”

(Excerpt taken from the 1842 edition of the Manual of Magnetism, page 94)

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