Valence bond structure of Ta-W alloys

The valence bond structure of substitutional BCC based Ta-W alloys is studied using characteristic crystal(CC)theory.This theory is based on cluster statistics of random alloys.By studying the correlativity between energy and volume of the CC in Ta-W alloys,the valence bond structure of CC is determined by the energy and shape method.Then,following additive law of CC,the valence bond structure of Ta-W alloys is calculated.It is found that the outer shell valence electronic distribution of Ta-W alloys shows ...     

A Computational Model for Two—stage 4K—Pulse Tube Cooler：part I.Theoretical Model and Numerical Method

IntroduedonThe need for ctyogenic coOling of magnehcresonance imaging (MRI), superconduchng quantUminterfernce devices (SQUIDs) and the associatedsuperconduchng devices has brought about a strOngdemand for high reliability and efficiency in coolers.SWg and GM coolers, which are very compact andreliable machines and have already commercial products,are widely used for such aPplications in the last decades.However, they have a tnoving pistOn at the cold end,which caused evidenily mechotal …     

Synthesis of p-nitrophenol under normal pressure with A-1 phase transfer catalysis

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CALCULATION OF FUZZY RELIABILITY IN THE CASE OF RANDOM STRESS AND FUZZY FATIGUE STRENGTH

0 INTRODUCTIONFatigUe Performance data Of metal material is the basic data for the fatigUe reliability design ofmechanical elements or systems. Because fatigUe test data has large scatter, to obtain the accuse oh Ncurve, much experimental data should be collected. HOweVer, only a small amount of sample data isavailable due to the eXPerimental costS or difficulty of collection. The following relationship Eq. (l )acqUired from a saal amount data POint(N, d ) is often imp~ise and a lea…     

ANALYSIS OF THE DEFLECTION OF REEDS IN AUTOMOTIVE HYDRAULIC SHOCK ABSORBERS

0 INTRODUCTIONAn automotive by~ic shock absolver is an import unit of suspension, can damp the vibndion Offare and lady qUickly, and improves ride and handling c~teristics. Many shock absorbers use reedsas extension and compression valve, because they can s~ify the structure of shock absorbers. To get thereopired rebound and compression resistance, the different thick reeds ~ overlaPPed together. In older tOfomeast foe oh~teristics of the shock absorber, many rese~hers are striating for…     

On-line Condition Monitoring and Diagnostic Network System for Rotating Machine Set

1IntroductionThemachineryinfactoryisalwaysthekeyequipment,soOn-lineConditionMonitoringandDiagnosticSystemCMDS)isveryimportant.Usingthissy000000stem,engineerscanknowtherunningconditionclearlyandanalyzethepossiblefaultswhenthesemachinesetscannotrunnormally.Computerscience,numericsignalprocessing,sensorandnetworktechnologyarethekeytechnologiesofnetworkbaseddistributedon-lineCMDS,anddevelopmentofthesetechnologiesmakeCMDSplayamoreimportantroleinindustry.NetworkstructureandfunctionofCMDSare…     

Control of LP Turbine Rotor Blade Underloading Using Stator Blade Compound Lean at Root

IntroductionLP turbines operate over some range of flow regimeson both sides of the nominal operating conditions. Acharacteristic feature of LP tUrbines are strong radial gradients of pressure, Mach number and flow angle, especially downstream of the stator, Where these gradientsdetechne inlet now conditions for the moving bladerow. The changing swirl velocity and swirl angle spanwise require considerable twist of the rotor blades. Forlow loads, low pressures at the inlet to the rotor at th…     

Incompressible Laminar Flow Over a Three-Dimensional Rectangular Cavity

IntroductionMany aerodynandc configurations include cavities asan integral part of design, manufactUre and performance.Examples of such configurations include landing-gearwells, bomb bays and junctions between surfaces, to namea few. Cavity phenomena can also be observed on a muchlarger scale, for example, around the channel gates orharbor entrances [l][2]. Flow past a cavity is oftencharacterized by unsteady velocity and density, andfurthermore by unsteady pressure fluctuation (oftenreferred…     

A Study of Schemes for Internet Data Transmission Based on CATV Networks

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EFFECTS OF SMALL ADDITIONS OF Mg AND Ag ON PRECIPITATION PROCESS OF Al-Cu-Li-(Mg)-(Ag)-Zr ALLOYS

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｔｅｒｎａｒｙＡｌＣｕＭｇａｌｏｙｓｗｉｔｈｈｉｇｈＣｕ∶Ｍｇｍａｓｓｒａｔｉｏｓ，ｓｍａｌａｄｄｉｔｉｏｎｓｏｆＭｇｐｒｏｍｏｔｅｔｈｅｐｒｅｃｉｐｉｔａｔｉｏｎｏｆｓｔｒｅｎｇｔｈｅｎｉｎｇｐｈａｓｅｓｗｈｉｃｈ...