Crystal Structure of 1-Methyl-5-phenylhydantoin

1　INTRODUCTIONInourinvestigationofhemithioacetals,wediscoveredthatα-benzoylhemithioac-etalisquitestableandhastwoelectrophilicsitesthatcanreactwithalkylureastoformahydantoinring[1].Althoughthehydantoinringitselfdoesnotpresentanymedicinalactivity,somedisubstitutedhydantoinshavebeenwidelyusedasmedicineforitsregulareffectonthebioelectricactivityofthenervoussystem.Inordertoim-proveandexpandtheactivityaswellastopreventsideeffects,variouskindsofhy-dantoinderivativeshavebeenpreparedandtested[2].…     

Ultra-thin Oxide Films on SiO2: An STM Study of Their Thermal Stability in the Presence of Au Deposit

ＩｎｔｒｏｄｕｃｔｉｏｎＭｅｔａｌ ｏｘｉｄｅ ｓｅｍｉｃｏｎｄｕｃｔｏｒ(ＭＯＳ)ｓｔｒｕｃｔｕｒｅｉｎ ｖｏｌｖｉｎｇａｔｈｉｎｌａｙｅｒｏｆＳｉＯ2 ｓａｎｄｗｉｃｈｅｄｂｅｔｗｅｅｎａＳｉｓｕｂｓｔｒａｔｅａｎｄａｍｅｔａｌｇａｔｅｅｌｅｃｔｒｏｄｅｉｓｏｆｃｒｕｃｉａｌｉｍ ｐｏｒｔａｎｃｅｉｎｆｉｅｌｄｅｆｆｅｃｔｔｒａｎｓｉｓｔｏｒｓ .Ａｔｐｒｅｓｅｎｔ,ｏｘｉｄｅｂａｒｒｉｅｒｌａｙｅｒｓａｓｔｈｉｎａｓ 80 ａｒｅｕｓｅｄｉｎｈｉｇｈｐｅｒｆｏｒ ｍａｎｃｅｓｉｌｉｃｏｎｄｅｖｉｃｅｓ[1]…     

Development and Electrochemical Studies of Ruthenium Based Mixed Oxide Catalyst Electrodes for Chlorine Evolution

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｒｅａｃｔｉｏｎｏｆｃｈｌｏｒｉｎｅｅｖｏｌｕｔｉｏｎｉｓｏｎｅｏｆｔｈｅｍｏｓｔｓｉｇｎｉｆｉｃａｎｔａｒｅａｓｕｎｄｅｒｉｎｖｅｓｔｉｇａｔｉｏｎｉｎｔｈｅｆｉｅｌｄｏｆｅｌｅｃｔｒｏｃａｔａｌｙｓｉｓｄｕｅｔｏｉｔｓｄｉｒｅｃｔｉｍｐａｃｔｉｎｅｌｅｃｔｒｏ ｃｈｅｍｉｃａｌｔｅｃｈｎｏｌｏｇｙ .Ｈｉｓｔｏｒｉｃａｌｌｙ ,ｔｈｅｃｏｎｓｕｍａｂｌｅａｎ ｏｄｅｓｓｕｃｈａｓｇｒａｐｈｉｔｅ ,ｓｉｎｔｅｒｅｄＦｅ3Ｏ4 ｏｒＰｂＯ2 ａｃｔｉｖａｔ ｅｄｇｒａｐｈｉｔｅ…     

Directed Evolution of Human Cu,Zn-SOD Under Artificial Oxidant Pressures

IntroductionSuperoxide dismutases play an important rolein organisms′ defense against highly reactiveoxygen species by removing the superoxideanions[1— 3 ] . According to their metal cofactor,three differentclasses of superoxide dismutases canbe distinguished:Cu,Zn- SOD,Fe- SOD and Mn-SOD. These three SODs are different in thephylogenetic distribution pattern,prokaryotescontain Mn- SOD,Fe- SOD or both,and Cu,Zn-SODs in the cytosol and peroxisomes of eukaryotesand homologous prote…     

Highly Sensitive Spectrofluorimetric Determination of Trace Amounts of Indium(Ⅲ) with Salicylaldehyde Salicyloylhydrazone

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓ ,ａｒｏｙｌｈｙｄｒａｚｏｎｅｓｗｈｉｃｈｃｏｎｔａｉｎｇｒｏｕｐ—ＣＯＮＨＮ ＣＨ—ｈａｖｅｂｅｅｎｔｅｓｔｅｄａｓｆｌｕｏｒｉ ｍｅｔｒｉｃｒｅａｇｅｎｔｓｆｏｒｔｈｅｄｅｔｅｒｍｉｎａｔｉｏｎｏｆａｌｕｍｉｎｕｍ ,ｇａｌｌｉｕｍ ,ｓｃａｎｄｉｕｍ ,ｚｉｎｃ ,ｃｏｐｐｅｒａｎｄｏｔｈｅｒｍｅｔａｌｉｏｎｓ[17] .Ｔｈｅｒｅａｃｔｉｏｎｏｆａｍｅｔａｌｉｏｎｗｉｔｈａｃｈｅｌａｔｉｎｇａｇｅｎｔｐｒｏｄｕｃｅｓａｒｉｇｉｄｍｏｌｅｃｕｌｅｗｉｔｈａ…     

正二十四烷烃石蜡/膨胀石墨（EG）复合相变材料分子动力学模拟

相变材料(PCMs)在相变时的恒温、高能量密度等特性,经常应用于设备的热管理,但是PCMs导热系数低的缺点影响了其使用范围.本文采用分子动力学方法,模拟了在正二十四烷烃石蜡PCMs中添加不同结构(层状、交叉状)的膨胀石墨(EG)之后构成的复合PCMs的物性.文章通过径向分布函数(RDF)、声子态密度(PDOS)、比热容和导热系数这四个指标,分析了夹角为0°的层状结构,夹角为45°、90°的交叉状EG添加物对于石蜡热物性的影响. EG(0°、45°、90°)添加使得石蜡的原子分布在不同程度上变得更加均匀、紧密,使得石蜡的比热容有所增加.同时,两种类型的添加物提高了石蜡的PDOS,提高了导热系数.其中,EG(90°)添加物对于石蜡导热系数的提升最为明显,石蜡/EG(0°、45°、90°)模型中EG的含量分别为33.63 wt%、30.86 wt%和23.20 wt%,相比于的石蜡的导热系数分别提升了417.1%、345.7%和522.9%. EG的添加能够提高石蜡的导热系数,不同结构的EG对石蜡导热系数的影响有着较大的区别.     

基于FPGA的血液分析仪驱动电路设计

提出了一种基于 FPGA 的血液分析仪驱动电路设计,以及一种基于频率测量的步进电机故障检测方法.其驱动电路采用模块化和自底向上的设计方法,实现对4个步进电机和24路电磁阀的并行驱动和实时故障检测,并可通过串行通讯与主控机进行数据交换.     

聚合物-富勒烯太阳能电池器件物理研究进展

近期共轭聚合物-富勒烯太阳能电池的器件效率已突破10%并接近商业应用的标准,在科研和产业领域引起了广泛关注. 伴随器件效率的提升,对有机太阳能电池器件物理过程的认识也在不断深入. 本文就近年来聚合物太阳能电池的代表性工作进行综述,着重介绍提高器件效率的新方法,涵盖三相本体异质结、反向器件、等离激元共振效应和叠层器件等热点技术;并就器件工作的物理过程进行探讨,介绍热激子分离理论、非整数次电荷复合等新观点. 通过材料设计、器件表征优化和理论计算等方法对聚合物太阳能电池进行的综合研究将有力推进这一新兴领域的发展和产业化.     

γ-聚谷氨酸水凝胶的性质、制备及其应用

系统介绍了γ-聚谷氨酸水凝胶的制备方法及其生物可降解性、高吸水性及保湿性、pH敏感性、生物相容性和可修饰性等性能,同时综合介绍了其在组织工程、药物控释和创面修复等方面的应用,结合本研究组工作对其未来的发展进行了展望。     

Preparation of Zirconia Based Packing Material and Its Evaluation

Silica-based packing materials have two serious drawbacks: lackness of pH stability and severe peak tailing in separation of basic solutes1,2. Recently, zirconia has been put much attention because of its high mechanical and chemical stability. Zirconia is completely stable from pH 1 to 14, even at temperature of 100(C3. The porous zirconia microspheres used as column packings can be synthesized by means of polymerization-induced colloid aggregation (PICA) method4,5 or a sol-gel process6. M…