记忆的痕迹

提起西班牙北部城市圣塞巴斯蒂安,有过旅行经历的人首先想到的是这里如同铺满全沙和蓝绿色海浪的"贝克湾",享有西班牙电影节之父赞誉的"圣塞巴斯蒂安国际电影节",还有酒吧商铺林立的老城区和米其林星级盛宴。传统与新潮在这里交织,使得这座巴斯克地区的海滨小城绽放出让人流连忘返的魅力。沿着古老的道路走向老城的苏罗阿广场,圣太摩博物馆就坐落于此。博物馆的外观装修新,一堵质朴的灰墙上面布满了凹洞,凹洞中绿色植物恣意生长。旁边并排着一座翻修过的前多明尼加共和     

羰基铁粉表面改性及其热稳定性研究

采用硅烷偶联剂对羰基铁颗粒进行表面改性,研究改性羰基铁粉的热稳定性,利用扫描电镜、红外光谱、差热分析等分析手段,对羰基铁粉表面改性效果和机理进行系统分析。结果表明:经过硅烷偶联剂改性之后的羰基铁粉红外图谱出现了Si—O—Si和Si—O—Fe的特征峰,说明硅烷偶联剂与羰基铁颗粒表面发生化学键合作用;改性后的羰基铁粉与未改性羰基铁粉相比,其分散性和抗氧化能力得到了明显提高。     

CEC光伏组件性能测试报告技术解析

一、CEC性能测试报告基本情况 美国参议院法案1(SB1)对加州太阳能鼓励计划作了详细说明,光伏组件必须列入SB1的合格组件清单才有资格享受加州政府的补贴.SB1包括两个州计划:加州太阳能倡议计划(CSI)和新太阳能家庭伙伴计划(NSHP),以及由公有电力设施相关的太阳能鼓励计划.CSI针对除新住宅建筑以外的所有光伏市场.NSHP针对新住宅建筑光伏市场.光伏组件是光伏系统中最重要的部件,享受补贴的系统所使用的光伏组件需要在加州能源委员会(CEC)网站上列名,其中最重要的步骤之一就是需要取得CEC认可的光伏组件性能检测报告.     

絮凝—吸附工艺联合处理1,2,4-酸废水

研究6-硝生产过程中产生的1,2,4-酸废水的处理工艺.采用絮凝和吸附手段处理1,2,4-酸废水,絮凝试验采用自制的双氰胺-甲醛聚合物为絮凝剂的絮凝体系;吸附试验采用自制的AEO-9改性的膨润土作为吸附剂.试验结果表明,以双氰胺-甲醛絮凝剂絮凝处理废水的最佳条件为:废水的pH=3,絮凝剂用量为1％,在70℃的水浴锅中快...     

折叠庭院

位于纽约的Dumbo是布鲁克林与曼哈顿岛隔河相望的一块街区,那里的建筑都比较高,折叠庭院就隐匿在那里林立高楼间的某一屋顶上,在充斥着钢筋水泥的城市之中,特别带有一种超现实的味道。庭院中草木菁菁,风格新颖。起伏的表面、流畅的线条、简洁的材质、相互结合的功能空间,其设计打破了     

Development of high-energy-density materials

The performance of an energetic compound is mainly decided by parameters such as density, oxygen balance, heat of formation,and stability. Among these properties, density is the most important factor because it determines the detonation pressure and velocity. One of the trends in the development of high-energy-density materials(HEDMs) involves the study of energetic materials with high nitrogen levels. A compound with high nitrogen content can obtain substantial energy from the heat of formation rather than from the intramolecular oxidation of carbon skeleton to release energy in the form of a nitro group or nitrate ester. In addition to excellent performance, the newly developed energetic materials should also possess high working power and insensitivity toward external influences for ensuring the safety of charge and service, high energy release rate, long service life,good compatibility, excellent biological performance, low toxicity, safe battlefield environment, and low moisture absorption,which meet the requirements of military and civilian use. This review summarizes the research progress on global HEDMs.TNAZ, FOX-7, octanitrocubanane, TAM, TKX-50, and N5 were believed to show promise in achieving application goals. The prospective vision of HEDMs containing ions, total nitrogen, metal hydrogen, and nuclear energetic isomers, overcoming technical barriers, synthesis of all-nitrogen materials, theoretical studies on desorption/adsorption system, and challenging technical problems that need to be solved for the safety of synthetic nitrogen compounds were discussed to further elucidate the effect of this subject.     

相邻RC框架结构地震碰撞过程模拟与初步分析

相邻建筑物碰撞是指地震作用下其间距无法满足相对位移要求时造成的侧向撞击,常常导致或加剧结构破坏。选取Hertz-damp接触单元模型,推导了考虑碰撞的结构动力方程,模拟了相邻钢筋混凝土（RC）框架结构地震碰撞过程。分析碰撞过程,并利用梁柱单元破坏指数的变化解释了相邻RC框架结构地震碰撞破坏机理,指出地震碰撞破坏作用不完全随防震缝宽度的增加而降低。     

Research on super-hydrophobic surface of biodegradable magnesium alloys used for vascular stents

Micro-nanometer scale structure of nubby clusters overlay was constructed on the surface of an AZ31 magnesium alloy by a wet chemical method. The super-hydrophobicity was achieved with a water contact angle of 142° and a sliding angle of about 5°. The microstructure and composition of the super-hydrophobic surface were characterized by SEM and FTIR. Potentiodynamic polarization and electrochemical impedance spectroscopy were used to evaluate the corrosion behavior, and the hemocompatibility of the super-hydrophobic surface was investigated by means of hemolytic and platelet adhesion tests. Results showed that the super-hydrophobic treatment could improve the corrosion resistance of magnesium alloys in PBS and inhibit blood platelet adhesion on the surface, which implied excellent hemocompatibility with controlled degradation.     

机器可读术语交换格式(MARTIF)———协商交换(ISO/FDIS12200:1998)(一)

MARTIF适用于机器可读术语数据的交换。ISO12200规定了以MARTIF格式交换术语数据时使用的置标标记、条目结构、字符编码、文件结构和文件类型定义。     

Single event transient characterization of SiGe HBT by SPA experiment and 3-D process simulation

Science China Technological Sciences - The single-photon absorption induced single event transient in the silicon-germanium heterojunction bipolar transistor is investigated. The laser wavelength...