尖晶石型复合氧化物MAl_2O_4（M=Sr,Ba）的制备、表征及可见光催化性能研究

用柠檬酸络合法制备了尖晶石型复合氧化物SrAl2O4、BaAl2O4,用XRD、TEM等手段对催化剂结构和性能进行了表征,并考察了其在可见光下降解刚果红的催化性能。结果表明,在可见光条件下,60 min内BaAl2O4使刚果红降解率达80%以上,SrAl2O4降解率大约为70%。SrAl2O4的催化活性低于BaAl2O4可能是由于电子层结构的不同造成的。     

The birth of a new industry: entry by start-ups and the drivers of firm growth: The case of encryption software

The paper analyses the birth of the encryption software industry (ESI), a new niche in the software industry. Using a Chandlerian perspective, this work reports the main facts about firm entry and growth, with a particular focus on start-up strategies and actions.Since scale economies do not play a major role in ESI, the paper investigates the different sources of firm competitive advantages.This work shows that innovation and product differentiation, along with investments in co-specialised assets, are variables strongly correlated to young firm probability to survive and grow. In doing so, we have collected highly detailed information on product introduction, US patents granted, worldwide alliances and biographical data of firm founders.     

The determinants of regional innovation in Europe: A combined factorial and regression knowledge production function approach

The present paper studies the determinants of regional innovation in Europe through a knowledge production function approach that combines factorial analysis and regression. Our dependent variable are the patents while we used initially 21 explanatory variables that were converted—by a factor analysis—into five non-observable “hypothetical” variables reflecting five important aspects of the innovation systems: the National environment, the Regional environment, Innovating firms, Universities and the R&D done by Public Administration. Our results show that all factors have a statistically significant effect on the production of knowledge (patents), although they present very different impacts.     

Sailing in all winds: Technological search over the business cycle

Business cycles modify firms’ incentives to innovate and the direction of innovation. By introducing a new measure of patent unconventionality this paper explores the impact of the business cycle on firms’ technological search strategies. We find that during upturns firms generate inventions characterized by a higher level of technological unconventionality. We also find that financially resilient and diversified firms produce more unconventional patents. While patent unconventionality is associated with technological impact and market value, firms extract more value by investing in unconventional inventions in downturns.     

杭州市PM10中有机碳和元素碳变化特征

2001年2月至2002年4月在杭州5个空气质量国控点采集176组PM10样品,分析有机碳（OC）和元素碳（EC）含量,并采用TEOM法同步监测PM10质量浓度,其中在卧龙桥国控点同时测PM2.5质量浓度。全市PM10年日均浓度为119.2mg•m-3。PM2.5年日均浓度为68mg•m-3。PM2.5与PM10质量浓度呈显著的线性关系。PM2.5/ PM10日浓度比值范围在0.31-0.95间变化,平均比值为0.62。OC和EC浓度分别为20.4 mg•m-3和4.0 mg•m-3,其相关性不好表明碳的来源复杂。二次有机碳（SOC）分别占各季OC的 37.1%,45.8%,58.0%,44.7%,表明杭州空气中存在一定的二次有机污染。     

185nm紫外光/氧化协同降解水体中微量三氯甲烷的研究

文章研究了185nm紫外光/氧化协同降解水体中微量三氯甲烷的降解情况,考察了溶液浓度、光解时间、溶液pH值以及加入氧化剂等对降解三氯甲烷的影响,研究结果表明,CHCl3的脱氯基本是由185nm紫外光引起;其脱氯率几乎不受pH值的影响;在近中性条件下,5mg.L-1的三氯甲烷水溶液的CODMn去除率、脱氯率均与光解时间呈指数上升;光解5min后,CODMn去除率可达50%左右,脱氯率则小于30%;CHCl3的解离主要是185nm光子的作用,而与其它氧化性物质无关。     

一类特殊完全r-部图的邻强边染色

研究了一类特殊完全r-部图K(r,n,n,…,n,n-1)的邻强边染色.证明了当m r≡0(m od2)时,有x'as(K(r,n,n,…,n,n-1))=n(r-1).     

第十届全运会男子篮球决赛进攻失误分析

通过对十运会男子篮球决赛阶段的46场篮球比赛现场统计,对篮球比赛中的进攻失误的原因、方式等因素分析,针对失误的情况提出可行性的建议,为我国运动员在篮球比赛中减少和避免失误提供参考依据。     

组态软件实时数据库系统研究及设计

利用Windows的DLL(动态连接库)和全局共享内存技术来建立系统实时数据库的设计思想,采取传统数据库系统、文件系统和内存数据库系统兼用,利用多种存储介质来构造系统的实时数据库系统,并通过给用户提供一套接口标准——实时数据库系统接口,来实现I/O驱动程序与用户程序和实时数据库系统间的高速数据传递。     

基于Multisim10的电机正反转控制电路的设计与仿真

Multisim10是电学仿真实验中广泛应用的理想工具。简单介绍了该软件的主要功能和新增功能,并详细介绍了应用Multisim10对电机正反转控制电路的设计与仿真。