简介:Inthepresentwork,anovelhybridcompositecomposedofTi-aluminidemulti-layeredpartandcontin-uous-SiCf-reinforcedTi-matrixpartusingavacuumhotpressing/hotisostaticpressure(VHP/HIP)sinteringprocesswassynthesized.Then,thedamagetolerancebehaviorofthishybridcompositewasstudiedbytensiletestsandinsituscanningelectronmicroscopy(SEM)three-pointbendingtests.Theresultsindicatethatthemechanicalpropertiesandcrackpropagationofthehybridcompositearestronglyinfluencedbytheextrinsictoughnessmecha-nism.Indetail,thecrackdeflectionofmulti-layeredcompositeandstrengtheningeffectofSiCf-reinforcedmatrixcompositeareobservedinthehybridcomposite.Owingtothestrengtheningeffectofcontinuous-SiCrre-inforcedTi-matrixpart,thetensilestrengthofhybridcompositeismuchhigherthanthatofneatTi-aluminidemulti-layeredcomposite.Furthermore,itisfoundthattheoptimaldamagetoleranceabilityisoptimizedwhenthenotchpositionislocatedattheTi-aluminidemulti-layeredpartduetothecrackdeflectionofmulti-layeredstructure.
简介:TheeffectofAl-3Ti-0.2C-5Sr(wt%)grainrefinerontherefiningperformanceandmodificationofA356alloywasinvestigatedusingopticalmicroscope(OM).ThemorphologyandcrystalstructureofternaryAl-Ti-SrphasesinAl-3Ti-0.2C-5Srrefinerwereanalyzedbyscanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM).TheresultsshowthattheternaryAl-TiSrphasesinAl-3Ti-0.2C-5SrrefinercanpromotethegrainrefiningefficiencyofA356alloy.TheternaryAl-Ti-Srphasesco-existintwomorphologies,i.e.,blocky-likephaseandsurround-likephase,besides,whichbothhavethesamechemicalcompositionofAl_(34)Ti_3Sr.ThecrystalstructureofAl_(34)Ti_3Srisface-centeredcubic,andthelatticeparameterisdeterminedtobeabout1.52nm.
简介:摘要目的探讨腹腔镜胃癌根治,D2淋巴结清扫术治疗胃癌的安全性及近期疗效。方法2015年1月至2016年3月,对84例胃癌患者行腹腔镜胃癌根治,D2淋巴结清扫术,其中根治性全胃切除30例,根治性远端胃大部切除54例,腹腔镜辅助胃癌根治术71例,全腹腔下胃癌根治术13例。观察术后恢复情况、并发症发生率、淋巴结清扫数目并分析。结果84例均顺利完成手术,手术时间120~320min,平均253.56±61.52min,出血量50~300ml,平均142.56±53.24ml。术后恢复肛门排气时间平均3.53±1.61天,清扫淋巴结32.43±13.23枚,术后平均住院时间13.21±5.62天。结论腹腔镜技术应用于胃癌,包括进展期胃癌根治手术是安全可行的,在淋巴结清扫上能够达到与开腹手术相当的效果,并且具有手术创伤小,术后并发症发生率低,恢复快等优势。
简介:摘要目的探讨神经症患者人格特质,以便为其研究、预防和治疗工作提供科学依据。方法采用EPQ测验,对本院门诊84例神经症患者进行测试,并与正常对照组比较,分析测定结果。结果就诊者中典型内向以及内向倾向者居多;典型情绪不稳及不稳定倾向者占64%。精神质和神经质因子均高于对照组,而内外向和掩饰程度因子均低于对照组;男性的精神质因子高于女性,掩饰程度低于女性,差异有统计学意义。神经症组E、N分高于对照组(P<0.01),内倾例数、情绪不稳定例数多于对照组(P<0.01),外倾例数、情绪稳定例数少于对照组(P<0.01)。结论强迫症患者可能具有神经质较明显、焦虑抑郁、情绪不稳定和紧张度高等人格特征。在临床工作中应根据患者性格特征进行心理干预。