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Topic: Centrifuge

In the News (Thu 23 May 13)

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	Centrifuge Las Vegas Nevada - VEGAS.com
		Despite the club's popularity, the area surrounding it never made much sense, especially as the powers at the MGM Grand loaded the Studio Walk area on the opposite corner of the resort with hip restaurants and bars.
		With the opening of Centrifuge, the MGM Grand finally has resolved this paradox.
		Gone are the bells and whistles of the one-armed bandits.
	www.vegas.com /nightlife/bars/centrifuge.html (430 words)

	Centrifuge Summary
		Protocols for centrifugation typically specify the amount of acceleration to be applied to the sample, rather than specifying a rotational speed such as revolutions per minute.
		Centrifuges are used in the attraction Mission: SPACE, located at Epcot in Walt Disney World, which propels riders using a combination of a centrifuge and a motion simulator to simulate the feeling of going into space.
		The heavier isotopes of uranium (uranium-238) in the uranium hexafluoride gas tend to concentrate at the walls of the centrifuge as it spins, while the desired uranium-235 isotopes are extracted and concentrated with a scoop selectively placed inside the centrifuge.
	www.bookrags.com /Centrifuge (1794 words)

	Centrifugation Basics (Site not responding. Last check: )
		Centrifugal force (measured as xg, gravity) is used to increase this settling rate in an instrument called a centrifuge.
		Centrifuges are devices used in a variety of scientific and technical applications which spin carrier vessels (centrifuge tubes) at high rotation speeds and very high centrifugal force.
		The centrifugal force (expressed as # gravities or, # xg) generated is proportional to the rotation rate of the rotor (in rpm) and the distance between the rotor center and the centrifuge tube.
	abacus.bates.edu /~ganderso/biology/resources/centrifugation.html (614 words)

	Centrifuge Market
		The world market for centrifuges, clarifiers, dissolved air flotation systems and hydrocyclones will grow from just over US$4 billion in 2002 to just under $5 billion in 2006, and by 2007 will be comfortably over the $5 billion mark.
		The second largest equipment category is the disc centrifuge that is used as a dairy separator as well as a purifier of pharmaceuticals, wine, and many other products.
		Basket and pusher centrifuges are widely used in the chemical industry and are used in sugar and other food processing applications as well.
	www.lboro.ac.uk /departments/cg/research/filtration/centrifuge_market.htm (440 words)

	Henderikus G.B. Allersma (Site not responding. Last check: )
		In the centrifuge a blowout was simulated by injecting air at the bottom side of the sample.
		The centrifuge tests show, however, that the clay layer causes a crater because the gas is accumulated in the first instance under the clay and finally break through suddenly.
		Centrifuge tests were performed to examine the mechanism of light nonaqueous liquid (LNAPL)transportation in an unsaturated sand deposite.
	dutcgeo.ct.tudelft.nl /allersma/hgball.htm (10839 words)

	University of Dundee: Centrifuge Centre (Site not responding. Last check: )
		Centrifuge modelling is being recognised increasingly as a powerful experimental technique for both geotechnical and geo-environmental engineering design.
		The centrifuge beam (radius 3.5m) is equipped with a pendulum swinging platform that will accommodate a model of up to 1m x 0.8m x 0.8m and can accelerate a one tonne package to 130 gravities.
		The centrifuge infrastructure and backup facilities are housed in the basement of the Civil Engineering laboratory block.
	www.dundee.ac.uk /civileng/research/geotech/centrifuge/intro.htm (277 words)

	Centrifuge tube phase separation plug - Patent 5785925
		A centrifuge sample tube phase separation plug is disclosed for use in conjunction with sample tube to effect organic solvent separation on a volumetric basis.
		The centrifuge sample tube is of the type having a conical bottom end closed at the apex with an upward extending cylindrical portion opening to the top of the sample tube.
		Into the centrifugation process, the plug releases from the cap and passes from the cap area, through the sample, to the top of the conical portion of the centrifuge sample tube.
	www.freepatentsonline.com /5785925.html (1968 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: )
		This improved centrifuge design is used by the commercial company Urenco to produce enriched uranium fuel for nuclear power stations.
		The exact details of advanced zippe-type centrifuges are closely guarded secrets, but the efficiency of the centrifuges is improved by making them longer, and increasing their speed of rotation.
		The P1 centrifuge uses an aluminum rotor, and the P2 centrifuge uses a maraging steel rotor, which is stronger, spins faster, and therefore enriches more uranium per machine than the P1 centrifuge's aluminum rotor.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Zippe-type_centrifuge (692 words)

	CNN.com - Nuke program parts unearthed in Baghdad back yard - Jun. 26, 2003
		A former Iraqi scientist gives the CIA nuclear centrifuge parts and plans buried in his rose garden.
		Obeidi told CNN the parts of a gas centrifuge system for enriching uranium were part of a highly sophisticated system he was ordered to hide to be ready to rebuild the bomb program.
		Centrifuges are drums or cylinders that spin at high speed and separate heavy and light molecules, allowing increasingly enriched uranium to be drawn off.
	www.cnn.com /2003/WORLD/meast/06/25/sprj.irq.centrifuge/index.html (0 words)

	Gas Centrifuge a Sensitive Nuclear Asset
		In the gas centrifuge uranium-enrichment process, gaseous UF 6 is fed into a cylindrical rotor that spins at high speed inside an evacuated casing.
		Centrifugal force also causes the heavier 238 UF 6 molecules to tend to move closer to the wall than the lighter 235 UF 6 molecules, thus partially separating the uranium isotopes.
		The high-frequency output from the frequency changer is fed to the high-speed gas centrifuge drive motors (the speed of an ac motor is proportional to the frequency of the supplied current).
	aopp.org /sr-gas.htm (1504 words)

	Centrifuge Laboratory
		The centrifuge is located in a below-ground open and square chamber with a height of 1.8 m and sides of 4.2 m, surrounded by 15 cm thick reinforced concrete walls and support slab.
		The centrifuge payload capacity is 20 g-ton with a maximum acceleration of 200g for static tests and 100g for dynamic tests.
		The centrifuge arm is balanced by adjusting the counterbalance weights on the swing platform which opposes the testing platform.
	ecivwww.cwru.edu /civil/facil/cl.html (817 words)

	Centrifuge apparatus - Patent 3957197
		In a continuous flow blood centrifuge, whole blood enters the centrifuge rotor and is centrifugally separated into three zones within the separation chamber of the rotor, the plasma zone, the white cell zone, and the red cell zone.
		It is somewhat impractical to construct a different centrifuge for each range of hematocrit values, so a method of adapting existing centrifuges to a wide range of hematocrit values has long been needed.
		It is a further object of this invention to provide a continuous flow centrifuge apparatus capable of separating whole blood with a high degree of separation, without the need of frequent regulation by a human operator.
	www.freepatentsonline.com /3957197.html (2418 words)

	Centrifuges - Centrifuge - Centrifugal Separators - Centrifuge Manufacturers (Site not responding. Last check: )
		Centrifuges are most often used for the separation of particles from solutions according to their size, shape, density, viscosity of the medium and rotor speed.
		Some centrifuges are able to run continuously, feeding in slurry to be separated and sending the divided substances through to outside chambers to be removed.
		Industrial centrifuges are wide ranging in styles and are used for the separation of larger volumes of liquid/solid from one another.
	www.iqsdirectory.com /centrifuges (1495 words)

	centrifuge — Infoplease.com
		The centrifuge consists of a fixed base or frame and a rotating part in which the mixture is placed and then spun at high speed.
		The separation can be done by a centrifuging process in which the uranium, contained in gas molecules, is rotated at high speed in a chamber so that the more massive molecules containing uranium-238 concentrate near the outer edge of the chamber and the lighter molecules containing uranium-235 concentrate near the axis.
		Centrifuges are also used for such diverse purposes as simulating gravitational fields in space and for drying laundry.
	www.infoplease.com /ce6/sci/A0811112.html (361 words)

	CGM - Centrifuge (Site not responding. Last check: )
		This centrifuge, in terms of radius (9.1 m to bucket floor), maximum payload mass (4500 kg), and available bucket area (4.0 m2) is one of the largest geotechnical centrifuges in the world.
		The centrifuge is capable of producing 75g's of centrifugal acceleration at its effective radius of 8.5m.
		The centrifuge capacity in terms of the maximum acceleration multiplied by the maximum payload is 53 g x 4500 kg = 240 g - tonnes.
	cgm.engineering.ucdavis.edu /Facilities/centrifuge.htm (329 words)

	The Scientist : Centrifuge Improvements Put New Spin On A Laboratory Workhorse
		Using centrifugal force obtained by spinning experimental samples at high revolutions per minute (rpm), the device functions as a preparative method to separate various sample components, within minutes, for further treatment.
		Reducing centrifuge cycle time is a high priority for many researchers who operate on a tight schedule.
		New technology in centrifuges is also bringing noteworthy improvements to the device's various components.
	www.the-scientist.com /article/display/16428 (1574 words)

	NEESinc > Research Activities > Centrifuge Labs
		The spinning action creates centrifugal force, which is used to separate substances of different densities or weights.
		A geotechnical centrifuge is used for research in geotechnical science, an area of civil engineering concerned how geological materials (dirt and rock) interact with the foundations of built structures such as bridges, roads, and houses.
		Centrifuge tests are important for understanding - and predicting - the effects of earthquakes on buildings, bridges, roads and the ground upon which they stand.
	www.nees.org /Research_Activities/centrifuge (440 words)

	FAQ: Centrifuge Repair, Centrifuge Rental, Centrifuge Sales, Centrifuge Parts, Used Centrifuges, Centrifugal Liquid ...
		The centrifuge is often considered an effective alternative to the filter press and is desirable because the centrifuge features an automated self-cleaning cycle that does not require constant labor and maintenance to maintain operation.
		Although typically more expensive, the centrifuge is often considered as an effective alternative to bag filter systems and is desirable because the centrifuge does not require consumable filter bags nor does it require the manual handling of sloppy wet filter bags.
		By centrifuging the liquid media and separating a large percentage of the small particles, fouling of the membrane is reduced and a higher membrane flux rate can be maintained over a longer period of time.
	www.uscentrifuge.com /faq.htm (1093 words)

	Centrifuge
		By this means the stress distribution in a model, arising from both body and surface forces, is scaled to that in the natural prototype, and in consequence the model structures evolve kinematically in the same way as their natural prototypes.
		The 20,000-g centrifuge at the Experimental Tectonics Laboratory at Queen's University and details of the experimental technique have been presented elsewhere along with previous results from our investigations of fold-thrust tectonics (Dixon and Summers 1985; Dixon and Tirrul 1991; Dixon and Liu 1992; Liu 1990; Liu and Dixon 1990, 1991, 1995; Dixon, 1995, 1996).
		Each model is subjected to horizontal compression from one end by a "hinterland wedge" of Plasticine which begins to undergo gravitational collapse and lateral spreading while the acceleration in the centrifuge is climbing from about 2500 g to the set level of 4000 g.
	www.geo.ucalgary.ca /frp/techlab/centrifuge.htm (764 words)

	University of Colorado, Geotechnical Centrifuge Laboratories
		Speed and torque signals generated by the centrifuge control system are used by the Fincor to vary the motor voltage (speed) and motor current (torque) in a closed-loop fashion.
		Primary speed feedback is provided by a tachometer generator mounted on the rear of the centrifuge motor, and primary torque feedback is provided by a current shunt resistor in the armature supply circuit.
		In order to achieve 1150 rpm at the motor required to operate the centrifuge to 200g, field current reduction is employed to alter the motor performance curve trading torque for speed.
	civil.colorado.edu /geotech/faci/centrifuge/drivesystem.html (472 words)

	A Substitute Pore Fluid for Seismic Centrifuge Modeling
		In seismic centrifuge modeling, a time-scaling conflict exists between dynamic and dissipative phenomena.
		Results from the permeability tests showed that the scaling requirements of the centrifuge environment were satisfied.
		The centrifuge experiments demonstrated clearly that the conflict between the dynamic and consolidation time scales exists and reinforced the need for a substitute pore fluid in tests designed to model prototype behavior.
	www.astm.org /DIGITAL_LIBRARY/JOURNALS/GEOTECH/PAGES/447.htm (283 words)

	About USEC - The American Centrifuge
		USEC Inc. is demonstrating and plans to deploy the American Centrifuge technology to replace the gaseous diffusion process used at its Paducah plant.
		In Piketon, Ohio, USEC is operating the Demonstration Facility for the purposes of demonstrating and evaluating the Company’s enhancements to U.S. centrifuge technology and centrifuge performance in a cascade configuration.
		The successful construction and operation of the American Centrifuge Plant is dependent upon a number of factors, including the success and timing of the demonstration and deployment of the American Centrifuge technology and the costs to develop that technology; financing; and the achievement of milestones under the DOE-USEC Agreement.
	www.usec.com /v2001_02/HTML/Aboutusec_Centrifuge.asp (0 words)

	Centrifuge \| World of Biology
		A centrifuge is a spinning device used to separate materials of different densities.
		Centrifuges are used industrially to separate impurities from products such as milk, lubricating oils, beer, and wine.
		Centrifuges work on the principle of centrifugal force and its counterpart, centripetal force.
	www.bookrags.com /research/centrifuge-wob (472 words)

	Libya's Gas Centrifuge Procurement: Much Remains Undiscovered
		Figure 1 is a schematic of a similar centrifuge that uses maraging steel rotors and a connecting bellows.
		This manufacturing complex was intended to make centrifuges after the initial 10,000 centrifuges were operating in Libya, and thus, by implication, it should be capable of making any centrifuge components for the original 10,000 machines that could not be supplied by the network.
		An urgent goal is to try to get centrifuge design and associated manufacturing instructions out of the hands of the members of the network and to prevent it from spreading to others.
	www.isis-online.org /publications/libya/cent_procure.html (1335 words)

	The Scientist : Biotech And Drug Industry Interest Fueling The Centrifuge Revolution
		Centrifuge applications range from pelleting whole cells or their nuclei in a low-speed centrifuge (accomplished at approximately 8,000 x g) to separating virus particles and subcellular bits such as proteins and plasmid DNA in an ultracentrifuge (at a force in the range of 600,000 x g).
		Because rotors occasionally must be removed from the centrifuge instrument, a rotor that weighs significantly less than the conventional units found in many of the older superspeeds (50 pounds or so) is a considerable improvement in the technology.
		Whether their rotors are made of metal or composite material, centrifuges are an essential piece of laboratory equipment, suitable for routine separations or for analytical studies of the interaction of biological molecules in a solution.
	www.the-scientist.com /article/display/16947 (2640 words)

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