recruitment and selection

... create atemporary selection area.181 Chapter 9: Working with Selections and Selection Layers 14_129869 ch09.qxp 11/29/07 11:57 AM Page 181 Alternatively, you can use the Quick Mask and Quick Select ... filled with the All Layers checkbox deselectedShapes filled with the All Layers checkbox selectedFigure 10-7:Filling asection with All Layers off and on.196Part III: Refining and Exporting ... selection layers are turned invisible, and the current selection area is converted to an image layer selection. (See Figure 9-26.)3. Highlight the image layer you want to work on, and use the selection however...

... 301References 316Chapter 14 Engineering Standards for Clutches and Brakes 317I. SAE Standards 317II. American National Standards Institute (ANSI) 320III. Other Standards Organizations 320Bibliography ... according to the SAE J661 standard. Field perform-Friction Materials 9 2Band Brakes Band brakes are simpler and less expensive than most other braking devices,with shoe brakes, as perhaps their ... derive, where possible, the design formulas for the major types of clutches and brakes listed in the contents and to display an example of their use in a typical design. Some pertinentcomputer...

... Sales, Administration and Human Resources, IT, and Finance and Accounting.Now, HKT mainly does business in two fields including implementation of IT and modern management models in business and ... conclusion, chapter 2 has introduced some main issues of recruitment and selection process including procedures of recruitment and selection and factors affecting these processes. This theoretical ... affecting the success of selection process. Some main determinants include (1) quantity of applicants, (2) quality of applicants, (3) supporting tools in selection process and (4) efficiency of...

... orchestral, and military band, ontrombone, fiddle, tin whistle, mandolin, and bodhran. …” If Irish music bethe food of medicine, play on. But that was not all, for he continued: “I alsoenjoy boxing and ... which to test the validity of selection decisions. In this sea ofuncertainty, it is not surprising that selection processes are open to criticism.5 Application and selection 66The whole emphasis ... others, or which shows doctors at work and health care in action mayenable you to be convincing in establishing your ability to communicate,71 Application and selection If the earnings of these...

... suchasbronze,glass,andgraphite,signicantlyaddtothewearresistanceofPTFE[3].Glassappearstobethemostcommonlyused.B.KevlarKevlaristheDuPonttradenameforanaramid(aromaticpolyamideber)thathasatensilestrengthgreaterthansomesteels,i.e.,someofthesebershaveamodulusupto27106psi(1.86105Mpa).Neverthelesstheyareexibleenoughtobewovenandprocessedastextiles,soKevlarbrakeliningsandclutchfacingsareavailableineitherwovenornonwovenforms.Theyareusedalongwithproprietarypolymerbindersinthemanufactureofbrakeliningsandclutchfacingsforbothwet(oilbath)anddryclutchapplications.Indrybrakeandclutchapplications,aexible,nonwovenformcanwithstanddynamicpressureupto3100kPa(450psi),arenonabrasivetoiron,steel,andcoppersurfaces,anddisplayandnominalcoecientoffrictionof0.36F0.1,asstatedbyonemanufacturer.Thismanufactureralsostatesthatinadryenvironmentthesebrakeliningsshowsignicantfadeat260jC(500jF)thatbecomesgreaterat370jC(700jF)[7].Hence,theymaybeusedinthoseindustrial,marine,ando-roadapplicationswherefadeisnotalimitingfactor;applicationscanincludeagricultural,industrial,marine ,and o-roadequipment.Inwetapplicationsthisnonwovenformoffacingmaterialissaidtowithstanddynamicpressureupto2760kPa(400psi)withanominalcoecientoffrictioninthe0.100.15rangewhendissipating23290W/cm2(0.22.5hp/in2)[7].Ambientoperatingtemperaturesarereplacedbypowerperunitareaattheliningfaceinwetapplicationsbecausetheenvelopinguidbathcoolstheliningasittransferstheheattocoolingnsortoanoilcooler.Clutchfacingsandbrakeliningsthatcontainnometalreinforcingwiresorsegmentsprovidelowwearonmatingsurfacesandeliminatethepossibilityofmetalfragmentsincoolingsystemlters.KevlarhasalsobeenusedinaproprietarysolidformtoobtainhighercoecientsoffrictioninawovenmaterialinwhichKevlarbersaremixedwithotherorganicandinorganicbersthatenclosebrasswireyarnstoproducealiningthatmaybeusedasadirectreplacementforolderliningsthatcontainasbestos[8].Becauseofthebrasswireandinorganicbers,theseliningmaybemoreabrasivethanthosewithoutthesematerials.Thisis,ofcourse,anaturalconsequenceofhavinghigherfrictioncoecientsontheordersof0.40dynamicand0.42static.Representativesecondfadeandsecondrecoverycurvesofthefrictioncoecientvs.temperatureofarepresentativeofsuchliningsareshowninFigure4,asdeterminedaccordingtotheSAEJ661standard.Fieldperform-Friction ... indicatesachangeinAfromapproximately0.45toapproximately0.07,forachangeof84.4%.Incontrasttothis,Figure7forsteelbrakeswithsinteredliningsshowsachangeinAfromamidrangevalueofabout0.25toamidrangevalueofabout0.14,forachangeof44%.However,carbon–carbonbrakesarelighterthansteelbrakesandcanbemadefromasinglematerial[11].F.OtherProprietaryMaterialsFrictionmaterialsproducedbymostmanufacturersareproprietarytotheextentthatnotalloftheiringredientsaredisclosed.Noneoftheingredientsmaybelistedforthoseliningmaterialsthatperformsatisfactorilywithoutcomponentsprovidedbyothers,suchasKevlar.AbsenceofasbestosalwayswillbenotedbyU.S.suppliers.Manymanufacturersofentirelyorpartiallyproprietaryliningsprovidedataonthenominalfrictioncoefficients,wear,andrecommendedtemper-aturerangesoftheirproducts,althoughafewwillsupplydataonlytoamanufacturingcustomer.Thisdatamaybeineithertabularorgraphicalform.TypicaltabulardatafordryliningmaterialsmaybesimilartothatshowninTable2,andtypicaldataforwet(oil,transmissionfluid)liningmaterialsmaybesimilartothatshowninTable3fortwodifferentliningmaterials.Thefirstofthese,GL483-110,isdescribedasalayeredKevlarmatwithembeddedcarbonparticlesthatarehighlywearresistant.Thislayeredcompositionisboundtogetherwithahighstrength,temperatureresistantphenolicsresin.Thesecond,GL383-114,isanon-asbestos,cellulosefibercompositefrictionpaperthatissaturatedwithasimilarphenolicsresin.(SeeFig.1.)Datainbothtableswereobtainedfromconditionsthatmaydifferfromthose ... material and carbon–carbon composites arewidely used in brakes for large aircraft, such as long-range commercial jets, and in military aircraft. Their typical construction is shown in Figure 6.Brakes...

... pressure upon the lining.Band Brakes 23Copyright © 2004 Marcel Dekker, Inc. 2BandBrakesBandbrakesaresimplerandlessexpensivethanmostotherbrakingdevices,withshoebrakes,asperhapstheirnearestrival.Becauseoftheirsimplicity,theymaybeproducedeasilybymostequipmentmanufacturerswithouthavingtopurchasespecialequipmentandwithouthavingtousefoundryorforgingfacilities.Onlytheliningmustbepurchasedfromoutsidesources.Bandbrakesareusedinmanyapplicationssuchasinautomatictransmissions(Figure1)andasbackstops(Figure5—devicesdesignedtopreventreversalofrotation),forbucketconveyors,hoists,andsimilarequipment.Theyareespeciallydesirableinthelast-mentionedapplicationbecausetheiractioncanbemadeautomaticwithoutadditionalcontrols.I.DERIVATIONOFEQUATIONSFigure2showsthequantitiesinvolvedinthederivationoftheforcerelationsused ... Quantities and geometry used in the derivation of the band-brake design relations.Band Brakes 19Copyright â 2004 Marcel Dekker, Inc. To ensure clearance, let the drum diameter be 32 in., and design ... pressure betweenthe drum and the lining, and w represents the width of the band. Uponsimplifying equations (1-1) and (1-2) and remembering that as the element ofband length approaches zero,...

... in lb, and the adjusting link isExternally and Internally Pivoted Shoe Brakes 57Copyright â 2004 Marcel Dekker, Inc. V. DESIGN OF SINGLE-ANCHOR TWIN-SHOE DRUM BRAKES Internal shoe drum brakes ... Marcel Dekker, Inc. 3ExternallyandInternallyPivotedShoe Brakes TypicalexternallyandinternallypivotedshoebrakesareshowninFigures1 and 2. In all but extremely rare designs, equal forces act upon ... Thislinkforceandtheactivatingmomentbothactonthesecondaryshoe,sothattheforceandmomentequationsofequilibriumforthesecond-aryshoebecomeFr2ẳrwZf2f1pcosfdfỵArwZf1f2psinfdfỵFlsinf2ỵh25-7ịFu2ẳrwZf2f1psinfdfỵArwZf2f1pcosfdfỵFlcosf2ỵh25-8ịwhere2histheanglesubtendedbytheadjustinglink.Next,Ma2ẳMp2ỵMf22RFlsinf22sinf22ỵh25-9ịwhereMp2andMf2areagaingivenbyequations(5.1 )and( 5.2)intermsofthepressuredistributiononthesecondaryshoe.TorqueforeithershoemaybecalculatedfromTẳArwZf2f1pdf5-10ịEventhoughtheseequationsdonotuniquelydeterminethepressuredistributionoverthebrakelining,theyarestillofusebecausetheyallowthedesignengineertocomparetheeectsofdierentrealisticpressuredistribu-tionandtodesigndrumsandshoeswhoserigiditywillinduceparticularpressuredistributionsovertheprimaryandsecondaryshoes.Therstofthetwopressuredistributionsconsideredisasynthesisof(1)thesinusoidaldistributionassociatedwithanondeformingdrumandshoe,generallyassociatedwithalightlyloadedbrake ,and( 2)theforcepeaksthatoccurattheendsofload-bearingmembersincontact.Thesecondofthetwoisasysthesisof(1)theconstantdistributionsaidtobeassociatedwithmoreheavilyloadedbrakes ,and( 2)thepreviouslynotedforcepeaks.Thusthepressuredistributionswillberepresentedeitherbypp0ẳec1c=f0ịcoscf0kc2ỵc3cẳff15-11ịorbypp0ẳec1c=f0ịcoscf0kc2ỵc3sincỵf1ị5-12ịfortheprimaryshoes,wherethepeakpressureoneachshoeoccursattheheelbecauseitspivotcannotsustainaradialforceintheoutwarddirection.TheserelationsproducethepressuredistributionsshowninFigures1 4and1 5forthe...

... 4LinearlyActingExternalandInternalDrumBrakesLinearlyactingdrumbrakesarethosefittedwithshoeswhich,whenacti-vated,approachthedrumbymovingparalleltoaradiusthroughthecen-teroftheshoe.TypicallinearlyactingdrumbrakesareillustratedinFigures1–3.Analysisoflinearlyactingbrakesincludesthoseinwhichthecentrallypivotedshoesareattachedtopivotedlevers,asinFigure1.Includingbrakesofthisdesignwithinthecategoryoflinearlyactingbrakesisjustifiediftheyaredesignedsothattheappliedforcesontheshoesandliningsactalongtheradiioftheshaftsthattheygripwhenthebrakesareapplied.Brakesofthistypemayacteitheruponbrakedrumsordirectlyuponrotatingshaftsandaresuitableforuseinheavy-dutyapplications,suchasfoundinminingandconstructionequipmentandinmaterials-handlingmachinery.Internallinearlyactingdrumbrakes,suchasusedontrucksinEurope,maybedesignedasinFigure2.Eitherpneumaticorhydrauliccylindersorcams ... 4LinearlyActingExternalandInternalDrumBrakesLinearlyactingdrumbrakesarethosefittedwithshoeswhich,whenacti-vated,approachthedrumbymovingparalleltoaradiusthroughthecen-teroftheshoe.TypicallinearlyactingdrumbrakesareillustratedinFigures1–3.Analysisoflinearlyactingbrakesincludesthoseinwhichthecentrallypivotedshoesareattachedtopivotedlevers,asinFigure1.Includingbrakesofthisdesignwithinthecategoryoflinearlyactingbrakesisjustifiediftheyaredesignedsothattheappliedforcesontheshoesandliningsactalongtheradiioftheshaftsthattheygripwhenthebrakesareapplied.Brakesofthistypemayacteitheruponbrakedrumsordirectlyuponrotatingshaftsandaresuitableforuseinheavy-dutyapplications,suchasfoundinminingandconstructionequipmentandinmaterials-handlingmachinery.Internallinearlyactingdrumbrakes,suchasusedontrucksinEurope,maybedesignedasinFigure2.Eitherpneumaticorhydrauliccylindersorcams ... f0ịsin aLinearly Acting External and Internal Drum Brakes 81Copyright â 2004 Marcel Dekker, Inc. 4LinearlyActingExternalandInternalDrumBrakesLinearlyactingdrumbrakesarethosefittedwithshoeswhich,whenacti-vated,approachthedrumbymovingparalleltoaradiusthroughthecen-teroftheshoe.TypicallinearlyactingdrumbrakesareillustratedinFigures1–3.Analysisoflinearlyactingbrakesincludesthoseinwhichthecentrallypivotedshoesareattachedtopivotedlevers,asinFigure1.Includingbrakesofthisdesignwithinthecategoryoflinearlyactingbrakesisjustifiediftheyaredesignedsothattheappliedforcesontheshoesandliningsactalongtheradiioftheshaftsthattheygripwhenthebrakesareapplied.Brakesofthistypemayacteitheruponbrakedrumsordirectlyuponrotatingshaftsandaresuitableforuseinheavy-dutyapplications,suchasfoundinminingandconstructionequipmentandinmaterials-handlingmachinery.Internallinearlyactingdrumbrakes,suchasusedontrucksinEurope,maybedesignedasinFigure2.Eitherpneumaticorhydrauliccylindersorcams...

... 5DryandWetDiskBrakesandClutchesThischapterondiskbrakesandclutcheswillconsiderannularcontactdiskclutchesandbothcaliperandannularcontactdiskbrakes,asillustratedinFigures1,2 ,and3 .Caliper disk brakes, ... Airflex Division, Cleveland, OH.)Dry and Wet Disk Brakes and Clutches 93Copyright â 2004 Marcel Dekker, Inc. used on large earth-moving equipment, on mine shuttle cars, and similarequipment ... multiple-disk brakes and clutches, illustrated in Figure 3, havesimilar multiple-disk construction, but operate in an oil bath. Thus these brakes are isolated from dirt and water, and the circulation...

... sin aị1-10ịCone Brakes and Clutches 109Copyright â 2004 Marcel Dekker, Inc. II.FOLDEDCONEBRAKEPrototypeconebrakeshavebeendesignedandtestedforarangeofvehiclesizes,fromtractorsandtrailerstosubcompactautomobiles[1].Boththelargeandsmallsizesusedafoldedconedesign,asillustratedinFigures 5and6 ,eachwitha=27j.Althoughtheconebrakehasfewerpartsthandrum brakes, thisadvantagemustbebalancedagainstthedisadvantageofrequiringanoutboardwheelbearing.Analysisofthefoldedconebrakewithasectorshoe,showninFigure5,toobtaindesignformulasforthetorquecapabilityandtherequiredactiva-tionforceisquitesimilartothatusedforsimpleconebrakesandclutches.SincethebrakesillustratedinFigures 5and6 useasectorpad,webegintheanalysisbyobservingfromFigure7(a)thatanelementofareaontheconicalsurfacemaybewrittenasdaẳrdudrsina2-1ịFIGURE4DesignregionsintheA,aplaneforconeclutches /brakes. Cone ... II.FOLDEDCONEBRAKEPrototypeconebrakeshavebeendesignedandtestedforarangeofvehiclesizes,fromtractorsandtrailerstosubcompactautomobiles[1].Boththelargeandsmallsizesusedafoldedconedesign,asillustratedinFigures 5and6 ,eachwitha=27j.Althoughtheconebrakehasfewerpartsthandrum brakes, thisadvantagemustbebalancedagainstthedisadvantageofrequiringanoutboardwheelbearing.Analysisofthefoldedconebrakewithasectorshoe,showninFigure5,toobtaindesignformulasforthetorquecapabilityandtherequiredactiva-tionforceisquitesimilartothatusedforsimpleconebrakesandclutches.SincethebrakesillustratedinFigures 5and6 useasectorpad,webegintheanalysisbyobservingfromFigure7(a)thatanelementofareaontheconicalsurfacemaybewrittenasdaẳrdudrsina2-1ịFIGURE4DesignregionsintheA,aplaneforconeclutches /brakes. Cone ... II.FOLDEDCONEBRAKEPrototypeconebrakeshavebeendesignedandtestedforarangeofvehiclesizes,fromtractorsandtrailerstosubcompactautomobiles[1].Boththelargeandsmallsizesusedafoldedconedesign,asillustratedinFigures 5and6 ,eachwitha=27j.Althoughtheconebrakehasfewerpartsthandrum brakes, thisadvantagemustbebalancedagainstthedisadvantageofrequiringanoutboardwheelbearing.Analysisofthefoldedconebrakewithasectorshoe,showninFigure5,toobtaindesignformulasforthetorquecapabilityandtherequiredactiva-tionforceisquitesimilartothatusedforsimpleconebrakesandclutches.SincethebrakesillustratedinFigures 5and6 useasectorpad,webegintheanalysisbyobservingfromFigure7(a)thatanelementofareaontheconicalsurfacemaybewrittenasdaẳrdudrsina2-1ịFIGURE4DesignregionsintheA,aplaneforconeclutches /brakes. Cone Brakes and Clutches 113Copyright â 2004 Marcel Dekker, Inc. where we again use the pressure p and element of area...

... Hysteresis and Eddy-Current Brakes 127Copyright â 2004 Marcel Dekker, Inc. II.MAGNETICPARTICLEBRAKESANDCLUTCHESThesebrakesareavailableinarangeofsizesthatincludethe100-lb-ftmodelshowninFigure3andthe8-lb-ftmodelshowninFigure4.Sincethesecon-figurationsareequallysuitedforclutches,theymaybecombinedtoformclutch-brakecombinations,asinFigure5.Whenusedasaclutch,theunithastwomovingparts;whenusedasabrakeithasonlyone.Whenusedasaclutch,theconfigurationisasrepresentedbythesche-maticinFigure6(a).Theinputshaftisattachedtoacylindricaldrum,termedthe ... Hysteresis and Eddy-Current Brakes 143Copyright â 2004 Marcel Dekker, Inc. IV. EDDY-CURRENT BRAKES AND CLUTCHES Construction of eddy-current brakes is physically similar to that of hysteresis brakes. ... Beyondthispointthetorquedecreasesrapidly,asshowninthesliptorqueversusspeedcurveinFigure13(a).ComparisonwithFigure13(b)correctlyimpliesthattheshapeofthedecreasing-torqueportionofthecurvetotherightofthecriticalpointreectsboththechangeinthehysteresisloopwithincreasingtemperatureandtheheattransfercharacteristicsofthecoolingsystem(i.e.,whetherairorliquidandthetemperatureandvelocityofthecoolingmedium).Whentheseconditionsarexedtheshapeofthecurveremainsqualitativelyinvariant.Thus,asthebraketorqueincreasesfromonesizeofbraketoanother,thatportionofthecurvetotheleftofthecriticalpointdecreasesunlessimprovedcoolingisusedtomovetheconcaveportionofthecurveupwardandtotheright,thusmovingthecriticalpointtotheright.ThemagnitudeofthatportionofthecurvewhichisindependentofrotationalspeedtotheleftofthecriticalpointinFigure14ais,ofcourse,alsodeterminedbythetorqueversuscontrolcurrentcurveshowninFigure14b.ThedierencebetweenthetorqueobtainedfromincreasinganddecreasingcontrolcurrentisshowninFigure2.Useofthetermsliptorque,incidentally,istoemphasizethatthetorqueactsbetweentwomechanicalpartswhichmaybemovingrelativetooneanotherbecausethesebrakesmaybeusedastensioncontroldevicesaswellasameansofstoppingtherotationentirely.FIGURE9Torque-slipspeedcurvesfordryfrictionandmagneticparticlebrakes(also clutches) .Magnetic Particle, Hysteresis and Eddy-Current Brakes 137Copyright â 2004 Marcel Dekker, Inc. 7MagneticParticle,Hysteresis ,and Eddy-CurrentBrakesandClutchesAllthreeofthesebrakeorclutchtypeshavenowearingpartsbecausethetorqueisdevelopedfromelectromagneticreactionsratherthan...

... park DHTPMBManageSaigon Hi-tech park SHTPMBManage(*) HHTPMB: Hoalac hi-tech park Management Board DHTPMB: Danang hi-tech park Management Board SHTPMB: Saigon hi-tech park Management Board Hi-tech parks ... the talent recruitment and selection in Danang Hi-Tech Park Management Board. - At present, number of staffs who are employed to work at the Danang Hi-Tech Park Management Board more than 50 ... topic.3111752326 - Bui Van Doanh TALENT RECRUITMENT AND SELECTION - A CASE STUDY AT DANANG HI-TECH PARK MANAGEMENT BOARD, VIETNAM TABLE OF CONTENTS:1. Introduction2. Literature Reviews3. Research...

... Eric Garner Recruitment and Selection Hiring the people you wantDownload free books atDownload free eBooks at bookboon.com2 Eric Garner Recruitment and Selection Hiring the people ... Key Points 193 Policy and Procedure 203.1 Recruitment Policy 203.2 e 12 Steps of Recruitment 203.3 Aims, Methods, and Review 213.4 Recruitment Methods 213.5 Data and Biodata 223.6 e Interview ... specialists and contribute to influencing our future. Come and join us in reinventing light every day.Light is OSRAMDownload free eBooks at bookboon.comClick on the ad to read more Recruitment and Selection 5...

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