采用铜模浇铸法制备了Al63Cu27Zn10、Al56Cu24Zn20、Al49Cu21Zn30和Al42Cu18Zn40非晶合金.X射线衍射谱图表明Al56Cu24Zn20和Al49Cu21Zn30为完全金属玻璃,而Al63Cu27Zn10和Al4
巨大甲状腺肿瘤压迫气管 ,使气管变异 ,造成呼吸困难 ,患者在手术期间发生呼吸道梗阻甚至有窒息死亡的危险[1] 。因此 ,对于麻醉方法的选择以及如何保持呼吸道畅通 ,是做好颈
近来,吻合器的应用日趋广泛和普及,其相关的并发症和死亡率也有明显的下降.目前,不但开腹手术广泛使用,而且腔镜内镜的使用也越来越普遍.缝合器的应用使一些传统的组织愈合观
目的比较研究外源正义和反义p53对所转染细胞系恶性表型的影响.方法构建正义和反义p53 cDNA真核细胞表达载体pEGFP-p53(RS)和pEGFP-p53(AS),用Lipofectin介导转染801D细胞.PC
目的探讨烧伤Ⅴ号在治疗早期Ⅱ度烧伤创面的应用价值.方法应用烧伤Ⅴ号治疗800例1 099个早期Ⅱ度烧伤创面.结果 800例患者中,效果优良94.63%,满意或尚可4.62%,失败0.75%;无痂
In this paper, the structure and operating principle of the dye-sensitized nanocrystalline solar cells (DSSC) are discussed. The electrolytes can be divided int
Jet characteristics of air supply opening in a ventilating or an air-conditioning system is primarily decided by the folw state in the duct connected to the ope
An irradiation grafting method was applied for the modification of nanoparticles so that the latter can be added to polymeric materials for improving their mech
分别用保加利亚乳杆菌、嗜热链球菌进行发酵乳实验,再取凝乳和后熟时的样品各50 mL,9000 r/min离心15 min,上清液于1000 u透析,再用聚乙二醇6000浓缩,最后Tris-Tricine缓冲系
Vehicle emissions are a major source of air pollution in urban areas. The impact on urban air quality could be reduced if the trends of vehicle emissions are we