简介:摘要目的在建立腹主动脉粥样硬化家大鼠模型基础上,通过动物实验,探讨心脑通络液对动脉粥样硬化大鼠血清TG、TC、LDL-C、HDL-C含量的影响,为治疗动脉粥样硬化的临床用药提供实验依据。方法选取健康雄性大鼠40只,动物随机分为5组,即空白组、模型组、阿托伐他汀组、心脑通络液低剂量组、心脑通络液高剂量组。参照文献,采用高脂饲料饲养结合球囊损伤腹主动脉内膜制备动脉粥样硬化模型,连续喂养4周并结合球囊损伤腹主动脉内膜后,继续给药10周,末次给药后24小时,动物处死,取材。运用生化法观测心脑通络液对动脉粥样硬化大鼠血清TG、TC、LDL-C、HDL-C含量.结果1.腹主动脉粥样硬化大鼠模型复制成功;2.心脑通络液可降低动脉粥样硬化大鼠血清TG、TC、LDL-C含量,并升高HDL-C含量;结论心脑通络液可通过降低动脉粥兔血清TG、TC、LDL-C含量、升高HDL-C含量,改善动脉粥样硬化的血脂异常。
简介:在中密度C/C复合材料基体上采用催化化学气相沉积方法生长碳化硅纳米线(SiCnw)及制备碳化硅纳米线/碳化硅(SiCnw/SiC)涂层,研究中密度C/C复合材料基体上加载催化剂后涂层沉积及其抗氧化性能,结果表明:中密度基体上催化制备SiCnw涂层,可改善沉积效率,同时可抑制裂纹扩展,明显改善SiC涂层在1200℃的氧化防护能力。另外,在1500℃的空气中氧化10h后,SiCnw/SiC涂层氧化质量损失率仅为1.34%,明显低于质量损失率为8.67%的单层SiC涂层。
简介:Onenewsesquiterpenecompound,namely,illihenlactoneA(1),andonenewprenylatedC6–C3compound,illihenryioneH(2),alongwiththreeknownsesquiterpenes(3–5)wereisolatedfromthestemsofIlliciumhenryi.Thestructuresof1and2wereelucidatedbyspectroscopicevidenceincludingNMR,HRESIMSandcirculardichroism(CD).Compound2exhibitedaweakinhibitoryratioforbglucuronidasereleaseinducedbyplatelet-activatingfactor(PAF)inratpolymorphonuclearleukocytes(PMNs)invitro.
简介:TheJOURNALOFANCIENTCIVILIZATIONS(JAC)ispublishedannuallybytheInstitutefortheHistoryofAncientCivilizations(northeastnormaluniversity,Changchun,JilinProvince,People’sRepublicofChina).Thisyear,weareproudtopresentthe30thvolumetotheacademicaudience.Firstissuedin1986afterthefoundationof
简介:Afamilyofpiecewiserationalquinticinterpolationispresented.Eachinterpolationofthefamily,whichisidentifieduniquelybythevalueofaparameterαi,isofC2continuitywithoutsolvingasystemofconsistencyequationsforthederivativevaluesattheknots,andcanbeexpressedbythebasisfunctions.InterpolantisofO(hr)accuracywhenf(x)?Cr[a,b],andtheerrorshaveonlyasmallfloatingforabigchangeoftheparameterαi,itmeanstheinterpolationisstablefortheparameter.Theinterpolationcanpreservetheshapepropertiesofthegivendata,suchasmonotonicityandconvexity,andaproperchoiceofparameterαiisgiven.
简介:Inthispaper,weintroduceaconditionweakerthantheLpdifferentiability,whichwecallCpcondition.Weprovethatifafunctionsatisfiesthisconditionatapoint,thenthereexiststhebestlocalapproximationatthatpoint.WealsogiveanecessaryandsufficientconditionforthatafunctionbeLpdifferentiable.Inaddition,westudytheconvexityofthesetofclusterpointsofthenetofbestappoximationsoff,{Pe(f)}ase→0.
简介:采用编织-粉料铺填法制备Cf/ZrB2预制体,经过“浸渍-炭化”制得C/C-ZrB2复合材料,研究材料的微观结构与力学性能、抗氧化性能和抗烧蚀性能。结果表明:ZrB2颗粒由树脂炭包裹,在C/C-ZrB2复合材料内部均匀分布。材料的氧化质量损失率随氧化时间延长呈线性增长,在1100℃温度下氧化10min和60min后质量损失率分别为2.67%和20.47%。该材料的抗弯强度为81.1MPa,氧化10min后抗弯强度仍保持在氧化前的80%,氧化前后均呈假塑性断裂模式。ZrB2粉体的加入可显著改善C/C复合材料的抗烧蚀性能,等离子烧蚀120s后,其质量烧蚀率和线性烧蚀率分别为0.30mg/s和8.75μm/s。玻璃态ZrO2的阻氧作用以及B2O3的挥发吸热是复合材料主要的抗烧蚀机理。