引进美国品种NC102和NC297配伍性分析

为分析引进美国新品种NC102、NC297的配伍性,采用均匀设计、混料试验设计的试验方法,构建引进品种组合模块、背景模块;采用梯度掺入法把引进品种模块与背景模块进行组配,对组配后的模块进行感官评吸,评价引进品种烟叶的配伍特性.结果表明:(1)NC102模块的掺配比例在0-20％时与红河、玉溪背景模块的配伍性较好,掺配比例在0-10％时与昆明背景模块的配伍性较好;NC297模块掺配比例在0-20％时与昆明、红河背景模块的配伍性较好,掺配比例在0-10％时与玉溪背景模块的配伍性较好;NC297和NC102模块掺配比例在50％-60％与各地区背景模块组配时,表现出较强的拮抗作用.(2)NC102、NC297模块的掺配比例超过60％时,组合后的模块香气风格会发生变化.     

氯离子掺入方式及偏高岭土对砂浆氯离子结合性能的影响

通过模拟海砂与拌合水将相同含量的氯离子引入砂浆,研究了氯离子掺入方式及偏高岭土对氯离子结合性能的影响。采用能谱仪(EDS)分析了砂浆中氯离子含量分布,使用X射线衍射(XRD)及微商热重法(DTG)分析了水化产物的变化,采用压汞法(MIP)分析了砂浆孔隙结构的变化。结果表明,海砂型氯离子存在从砂粒表面向胶凝材料扩散的过程,而拌合水引入氯离子在砂浆中分布较为均匀。龄期1 d时,砂浆对海砂型氯离子结合性能低于拌合水引入氯离子;龄期28 d时,两种内掺型氯离子结合性能趋于一致。偏高岭土加速早期水泥水化反应,会促进砂浆对拌合水引入氯离子的结合。随偏高岭土掺量的增加,Friedel’s盐及Ca(OH)₂含量逐渐减少。20%与30%(质量分数)偏高岭土掺量下,拌合水引入氯离子对孔隙结构的细化效果更为显著。     

外科植入物微弧氧化层中引入元素定量检测方法的研究

目的建立外科植入产品微弧氧化层中P、Si等引入元素定量检测的方法,以作为表面微弧氧化改性安全性评价的一部分。方法从工艺角度分析表面微弧氧化层引入元素的种类和来源,通过X射线荧光能谱基本参数法,检测钛及钛合金表面微弧氧化层中由加工工艺引入的元素成分,并进行定量检测。结果设置X射线荧光能谱仪基本实验参数,借助标准样块建立了定量检验方法。该方法的相关系数为0.998以上,线性良好。该方法的检测下限Si为30μg/g,P为10μg/g。在精密度测试中,结果的相对标准偏差(RSD,n=6)在3%以内。在准确度实验中,标准物质检测结果的平均值与标称值的偏差在2%以内。将该方法应用于市面上不同厂家的外科植入物产品中,A厂家的产品检测出P元素,B厂家的产品检测出Si元素。分别重复检测6次,所得检测结果的相对标准偏差(RSD)均在2%以内。结论该方法具有操作方便、检出限低、精密度高、测试时间短等特点,是目前外科植入物表面微弧氧化定量检测及评价较为理想的实验方法。     

一种基于CAN网络的快速与高可靠性传输系统

文章介绍了一种基于CAN总线的分布式数据采集和控制系统ADAM-5000/CAN及其系统实现方法。     

Vegetation development and restoration potential of drained reservoirs following dam removal in Wisconsin

Dam removal is potentially a powerful tool for river and riparian restoration. However, long‐term studies on the fate of former reservoirs do not exist, limiting assessment of the utility of dam removal as a means of riparian restoration. We took advantage of the decades‐long legacy of dam removals in Wisconsin to determine human uses of drained reservoirs and to evaluate vegetation establishment and species replacement at these sites. More than half of the 30 dam removal sites in southern Wisconsin over the past 47 years were used as commercial areas, parks and agricultural land, and active riparian restoration occurred on only two sites. For the 13 sites that were allowed to revegetate on their own, plants established in the first growing season and cover was very high at all sites in 2001. Species diversity and frequency (defined as percentage of sampled quadrats where a species is present) of trees were positively correlated with time since removal. No relationship existed between site age and frequencies of other growth forms, nor were there significant relationships between site age and the number or frequency of introduced species. However, mean frequency of introduced species was 75% per site and several sites were dominated by the introduced grass Phalaris arundinacea. Frequency of P. arundinacea was negatively correlated with number of native forbs, and lowest species diversity occurred on sites dominated by P. arundinacea. Ordination analyses revealed substantial site‐to‐site variation in vegetation that was weakly associated with gradients of site location, age, area, and soil phosphorus. Thus, temporal vegetation dynamics following dam removal were site‐specific. Rapid revegetation demonstrates the potential of these sites for riparian restoration. However, if dam removal is used as a means of restoring native riparian communities, then approaches must be tailored to individual sites and will need to focus on techniques to minimize establishment of aggressive invading species. Copyright © 2006 John Wiley & Sons, Ltd.     

两引种地紫锥菊扫描电镜的观察研究

目的:为引种紫锥菊药材鉴定提供微形态依据。方法:采用扫描电子显微镜技术对怀柔和桐城两引种地紫锥菊叶片和花粉粒进行观察和比较。结果:两引种地紫锥菊在叶片微形态上具有相似性,但花粉粒在萌发孔类型和极面观形状上差异较大,存在一定的分化。结论:不同引种地紫锥菊的花粉粒微形态特征存在差异,可为不同引种地紫锥菊的鉴别和分类提供参考依据。     

Field attractiveness of chirally defined synthetic attractants to males ofDiprion similis andGilpinia frutetorum

Field attractiveness of synthetic attractants toward males of two introduced species of sawflies was examined. It was first established that the esters of 2S,3S,7S-3, 7-dimethylpentadecan-2-ol (diprionol), which have been active toward males of manyNeodiprion species, were inactive toward males ofDiprion similis andGilpinia frutetorum, To determine the chiral combination of the alcohol moiety, four different isomers, each containing specific chirally defined carbons, were synthesized. As a result it was concluded that the most active chiral arrangement of diprionol for these species is 2S, 3R, 7R.     

Study on Guidance Law of UAV Net Recovery System

The design and realization of a net recovery system is introduced, which can recover UAV （unmanned aerial vehicle） reliably and safely. The mathematical model is built, and the horizontal and vertical guidance law is studied based on the aerodynamic parameters and actual flying trial data of a certain UAV. The simulation result shows that this system can realize the recovery safely, stably and accurately.     

土木工程专业本科教育中法合作办学项目的探索与实践

零基础的法语强化学习和法方承担引进课程采用法文授课是土木工程中法合作办学项目的主要特点。为提高土木工程中法合作办学项目的办学质量,在完善培养计划、提高引进课程的教学质量、加强始业教育、营造法语文化氛围、加强项目管理等方面开展了一系列探索与实践。     

考虑群体效应中庭幕墙及采光顶风洞试验研究

介绍了上海世茂北外滩商务楼中庭钢结构大跨点支玻璃幕墙及采光顶的风洞试验概况和结果,给出了玻璃幕墙的玻璃及支承体系抗风设计的风压确定方法,研究了幕墙及采光顶在考虑塔楼群体结构效应情况下的风压分布特征。利用风洞试验每个测点的风压时程信号,采用Newmark积分方法计算了幕墙及采光顶的风振时程响应,并以此为基础计算了风振系数。