简介:Asoneofcandidatesforthefuelcladdingorstructurematerialusedinfourthgenerationfissionandfusiondemonstratereactor,MAXphasehasthepropertiesofbothceramicandmetal,suchashighmeltingpoint,hightemperaturestability,gooderosionresistanceandradiation-damagetolerance[1;2].Maxphaseisaseriesofceramicsofnanolamellarandhexagonalstructure.Mrepresentstransitionelement.Arepresentsthethirdorfourthmaingroupelement.XrepresentNandC.Inthedesignoflead-cooledfastreactor,itisrequiredthatthematerialshouldendurethecorrosionofliquidPb-Bialloy.Therefore,understandingoftheoxidelayersandtheirgrowthmechanismsinLBEisfundamentallyimportantforthedevelopmentofcandidatematerials.
简介:摘要小儿便秘指大便干燥、坚硬,秘结不通,排便时间间隔较久(>2天),或虽有便意而排不出大便。番泻叶性味甘、苦、寒,有小毒,归大肠经,可泻热,通腑,行水消胀。多有采用番泻叶开水泡服对小儿进行进行通便治疗。本文选取我院收治的因服用番泻叶开水泡服致小儿大疱性皮炎的3例患者的临床资料,通过文献查询,未见相关文献报道,现总结报道如下,以指导临床诊断及治疗
简介:通过学习《3-6岁儿童学习与发展指南》,认识到在幼儿教工作中应关注幼儿身心全面和谐的发展,要尊重幼儿发展的个性差异,遵循幼儿的学习特点与发展规律,努力提升自己的专业水平,做一名研究型的幼儿教师。
简介:主持人语:3D打印亦称增材制造。3D设计的开放化、数字制造的社会化、3D打印机的商用化使人类跨越从"虚拟到现实"(virtualtoreality)、从"创意到产品"(mindtoproduct)的鸿沟,通过DIY打开了比特向原子(bitstoatoms)复归的大门,自此撩开3D打印侵犯知识产权的神秘面纱。3D打印技术作为一种新型的复制手段,将对著作权法产生何种影响?专利法如何回应社会制造对专利产品修理再造规则的挑战?怎样完善3D打印专利间接侵权在客观行为、主观意图和行为后果等方面的认定标准?商标法岂能防止3D打印导致的商标功能淡化抑或贬损? 华中科技大学是国内率先从事3D打印和知识产权教学研究的高校之一,针对3D打印技术发展与知识产权制度的变革,做了大量的前期研究工作。本期专题冀通过对上述问题的探讨,从中一览知识产权制度应对3D打印技术发展的概貌。
简介:Chromiumacetylacetonateandbis(diphenylphosphino)isopropylaminewerecoordinatedinsituandsupportedonmethylaluminoxane-modifiedsilica.Thecatalyststructureandeffectsofreactiontemperature,reactionpressureandAl/Crmolarratioonethylenetetramerizationwereinvestigatedindetail.Chromiumwasuniformlyandfirmlyimmobilizedonthesupportandcouldnotbeleachedoffbymethylaluminoxane.Thesupportedcatalyst,uponbeingactivatedwithmethylaluminoxane,exhibitedcatalyticactivityof1.70×107g/(molCr·h)forethylenetetramerizationtoform1-octeneatareactiontemperaturesof80℃,apressureof2.0MPaandanAl/Crmolarratioof300.Thesupportedcatalystpresentedagoodtolerancetohightemperature.