简介:Inthispaper,weextendtheapplicationsofproperorthogonaldecomposition(POD)method,i.e.,applyPODmethodtoamixedfiniteelement(MFE)formulationnaturallysatisfiedBrezz-Babuskaforparabolicequations,establishareduced-orderMFEformulationwithlowerdimensionsandsufcientlyhighaccuracy,andprovidetheerrorestimatesbetweenthereduced-orderPODMFEsolutionsandtheclassicalMFEsolutionsandtheimplementationofalgorithmforsolvingreduced-orderMFEformulation.Somenumericalexamplesillustratethefactthattheresultsofnumericalcomputationareconsistentwiththeoreticalconclusions.Moreover,itisshownthatthenewreduced-orderMFEformulationbasedonPODmethodisfeasibleandefcientforsolvingMFEformulationforparabolicequations.
简介:摘 要: 在TCP+MFE测试中,由于井的深度不同,测试时我们需要根据井的深度来解决各种我们有可能遇到的问题。油管传输射孔(TCP)与地层测试工具联作,在射孔的同时完成地层测试,可实现负压射孔、减轻地层污染,与电缆射孔相比具有更大的优越性。较深的井(一般在3000m-4000m之间,甚至4000m以上),地层压力、地层温度都相对较高,还有部分高产气井、斜井、超压井等因素影响,给测试联作施工带来很多困难。本文通过解决P-T封隔器的座封负荷、MFE测试器的延时等问题,克服了MFE测试器在浅层井测试中存在的局限性,并经实测应用成功,为浅层测试积累了丰富的经验。同时,从施工设计、测试工具的保养维护等方面,对深井联作测试过程中经常出现的失封、泄压、管柱漏失等异常情况进行分析并提出解决的方法。
简介:Threenewcomplexes[Ni(H2L)][Fe(CN)5(NO)]2·6H2O(1),[Ni(H2L)][Fe(CN)5(NO)]2·4H2O(2)and[Cu(H2L)][Fe-(CN)5(NO)]2·4H2O(3)(L=3,10-bis(2-aminoethyl)-1,3,5,8,10,12-hexaazacyotetradecane)arepreparedandcharacter-izedbyIR,elementalanalysesandsingle-crystalX-rayanaly-ses,indicatingthattheyarethefirstexamplesoftrinurlearni-troprnsside-bridgedMFe2(M=CuandHi)complexes.Inthethreecomplexes,thecentralmetalatoms(M)areallsix-coor-dinatedbythenitrogenatomsfromthemacroeyclicligandandtwocyano-bridgesatthetrans-positionstoformdistortedocta-hedralconfigurations.TheaxialN—M—NlinkageisnearlyverticaltotheequatorialplanedefinedbyfourcoordinatingNatomsofmcroeyclicligand.TheC≡N—Nibondangleof172.6°incompleox1isapparentlylargerthanthoseincom-plexes2and3(152.57°and136.37°,respectively).Thethreecomplexesareallconnectedbyhydrogenbondsinto3Dnet-works.Thisstudyshowsthatthecyano-bridgedtrinuclearspeciescouldbegeneratedviathecontrolofthechargeofthebuildingblocks.