哈茨木霉菌Tri101基因的克隆与序列分析

根据拟枝孢镰刀菌等真菌中Tri101的保守序列设计简并引物,利用简并PCR和基因组步行法克隆了哈茨木霉菌Tri101基因.结果表明:Tri101基因的开放阅读框为1 314 bp,无内含子存在,与预计的Tri101序列特征一致.该基因编码蛋白质由437个氨基酸组成,预测相对分子质量约为4.75 kD,系统进化树显示其与棒曲霉(Aspergillus clavatus)NRRL 1亲缘关系最近,与NRRL 1中3-O-乙酰转移酶的的蛋白质同源性达到55%.Blast数据库分析表明其属于转移酶总科,单端孢酶烯乙酰转移化酶.以禾谷镰刀菌(Fusarium graminearum)TRI101蛋白(Parent PDB:3b2s Chain:A)的晶体为模板进行了同源建模,为进一步研究该基因的功能奠定基础.     

Ni_(70)Mn_(25)Co_5合金组织对人造金刚石合成的影响

研究了触媒合金组织结构及第二相含量对金刚石合成效果的影响。结果表明 :随着变形组织中第二相含量的增加 ,金刚石粒度变细 ,强度降低 ,合成工艺调节难度增加 ;触媒再结晶组织有利于金刚石合成效果的提高及合成工艺的改善。触媒组织中第二相和位错明显影响金刚石形核数量     

Minimizing Average Schedule Length under Memory Constraints by Optimal Partitioning and Prefetching

Over the last 20 years, the performance gap between CPU and memory has been steadily increasing. As a result, a variety of techniques has been devised to hide that performance gap, from intermediate fast memories (caches) to various prefetching and memory management techniques for manipulating the data present in these caches. In this paper we propose a new memory management technique that takes advantage of access pattern information that is available at compile time by prefetching certain data elements before explicitly being requested by the CPU, as well as maintaining certain data in the local memory over a number of iterations. In order to better take advantage of the locality of reference present in loop structures, our technique also uses a new approach to memory by partitioning it and reducing execution to each partition, so that information is reused at much smaller time intervals than if execution followed the usual pattern. These combined approaches—using a new set of memory instructions as well as partitioning the memory—lead to improvements in total execution time of approximately 25% over existing methods.     

基于Web技术的电力数据查询系统设计

由于当前电力数据查询系统存在用户办面不统一,图形数据和数据难于在广域网中传输等问题,本文提出了在电力数据网中采用Web技术实现电力调度自动化数据查询系统的设计方案,对图形数据和实时数据在Web系统中的传输做了比较深入的研究并完成了相关软件的开发。     

Review of Pathology and the postmodern: Mental illness as discourse and experience.

Reviews the book, Pathology and the postmodern: Mental illness as discourse and experience by Dwight Fee (2000). This provocative collection of short essays, edited and assembled by Dwight Fee, constitutes yet another useful addition to SAGE Publications’ Inquiries in Social Construction series (series editors, Kenneth Gergen, John Shotter, and Sue Widdicombe). Including the work of such postmodern and social constructionist thinkers as Kenneth Gergen, Mark Freeman, Vivian Burr, Jane Ussher, Simon Gottschalk, Steven Sabat and Rom Harré, this anthology sets out to explore the relationship between mental distress and specific cultural, economic, and historical contexts and trends. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于天府文化仿生的有轨电车外观设计研究

目的 结合文化仿生设计,研究具有天府文化特色的现代有轨电车外观设计方法。方法 总结现代有轨电车、天府文化和文化仿生的理论基础。基于文化仿生,对国内外现代有轨电车外观设计典型案例进行分析,提出基于天府文化仿生的现代有轨电车设计方法与流程。对本体层、行为层、价值层的天府文化实行调研与分析,总结出典型的天府地域文化元素。通过模糊综合评价法优选出一种天府文化元素,耦合文化仿生的表象阶段和意象阶段,将其结果应用到现代有轨电车外观设计中。结果 将川剧脸谱作为文化仿生对象,简化其脸谱的显著特征,着重将其形态和色彩融入到100%低地板现代有轨电车的造型和涂装设计中。结论 通过文化仿生实践案例,表明文化仿生能较好地将天府文化通过城市有轨电车的外观设计进行传播,为现代城市有轨电车外观设计研究提供理论依据及参考。     

白车身视觉检测系统空间坐标系的建立

本针对南京IVECO车身厂的成车车身提出了一种视觉检测系统,介绍了系统的原理、组成及其工作过程。以多传感器“融合”技术为基础,利用双经纬仪实现坐标系统一,完成了测试实验及数据采集,取得了较高的测量准确度。     

Teaching with ALN Technology: Benefits and Costs*

The implementation of Asynchronous Learning Network (ALN) technology in a large on‐campus course over several years is reviewed, and recent data concerning both educational and cost effectiveness are presented. Even with higher course standards for success, student performance on examinations has improved, a larger fraction of students achieve the goals of the class, and the proportion of students who excel has increased. Female students benefit even more than their male counterparts. The level of communication and interaction among students has also increased dramatically, with mostly positive (but some negative) effects. Data concerning cost effectiveness indicate that the technology can reduce costs, but perhaps more importantly, it can increase the quality of education without increasing costs.     

Differential scanning calorimetry study and computer modeling of <Emphasis Type="Italic">β</Emphasis> ⇒ <Emphasis Type="Italic">α</Emphasis> phase transformation in a Ti-6Al-4V alloy

The relationship between heat-treatment parameters and microstructure in titanium alloys has so far been mainly studied empirically, using characterization techniques such as microscopy. Calculation and modeling of the kinetics of phase transformation have not yet been widely used for these alloys. Differential scanning calorimetry (DSC) has been widely used for the study of a variety of phase transformations. There has been much work done on the calculation and modeling of the kinetics of phase transformations for different systems based on the results from DSC study. In the present work, the kinetics of the β ⇒ α transformation in a Ti-6Al-4V titanium alloy were studied using DSC, at continuous cooling conditions with constant cooling rates of 5 °C, 10 °C, 20 °C, 30 °C, 40 °C, and 50 °C/min. The results from calorimetry were then used to trace and model the transformation kinetics in continuous cooling conditions. Based on suitably interpreted DSC results, continuous cooling-transformation (CCT) diagrams were calculated with lines of isotransformed fraction. The kinetics of transformation were modeled using the Johnson-Mehl-Avrami (JMA) theory and by applying the “concept of additivity.” The JMA kinetic parameters were derived. Good agreement between the calculated and experimental transformed fractions is demonstrated. Using the derived kinetic parameters, the β ⇒ α transformation in a Ti-6Al-4V alloy can be described for any cooling path and condition. An interpretation of the results from the point of view of activation energy for nucleation is also presented.     

Strength and Serviceability of FRP Grid Reinforced Bridge Decks

The research presented in this paper evaluates the flexural performance of bridge deck panels reinforced with 2D fiber-reinforced polymer (FRP) grids. Two different FRP grids were investigated, one reinforced with a hybrid of glass and carbon fibers and a second grid reinforced with carbon fibers only. Laboratory measured load-deflection, load-strain (reinforcement and concrete), cracking, and failure behavior are presented in detail. Conclusions regarding failure mode, limit-state strength, serviceability, and deflection compatibility relative to AASHTO mandated criteria are reported. Test results indicate that bridge decks reinforced with FRP grids will be controlled by serviceability limit state and not limit-state ultimate strength. The low axial stiffness of FRP results in large service load flexural deflections and reduced shear strength. In as much as serviceability limits design, overreinforcement is recommended to control deflection violation. Consequently, limit-state flexural strength will be compression controlled for which reduced service stresses or ACI unified compression failure strength reduction factors are recommended.