交换环上辛代数和正交代数的抛物子代数的导子

设R是有1的交换环,L是R上的辛代数或正交代数,h是L的极大环面子代数,b是L中包含h的标准Borel子代数.在2∈R可逆的条件下,本文详细描述了b与L之间的中间李代数,并且证明这些中间李代数的导子都是内导子.     

含单轴媒质和多层金属栅的多层介质结构电磁散射分析

应用有限元法结合Floquet定理分析含单轴媒质和多层金属栅周期性结构的多层有耗介质结构的电磁散射特性.首先对单层单轴媒质和带有单层金属栅的介质平板的反射系数进行了计算,数值结果与文献报道结果一致,验证了理论模型与计算程序的正确性.在此基础上,计算了含单轴媒质和三层金属栅结构的多层介质平板的散射参数.数值结果表明,该方法可有效地分析含单轴媒质的多层介质中任意形状周期结构的散射特性.     

基于人民币升值广义事件窗的美元/人民币汇率风险评价

本文选取了近两年来美元/人民币的日汇率样本作为广义事件窗中的样本信息,以2005年7月21日这一日期为时间分界点.分别研究人民币升值前后即广义事件窗中该汇率的各种统计特性,利用非线性时间序列模型的方法,分别对汇率的收益率序列建立合适的模型,用以分析人民币升值前后汇率风险水平的变化,即汇率风险评价.     

基于比率的离散型Leslie系统正周期解的存在性

利用重合度理论中的延拓定理讨论了具Holling-Tanner Ⅲ类功能反应比例确定的离散周期Leslie系统的正周期解的存在性,获得了正周期解存在的充分条件.     

高强轻集料钢筋混凝土梁抗弯性能试验

通过对6根高强轻集料钢筋混凝土梁和1根普通钢筋混凝土梁的抗弯试验,研究了高强轻集料钢筋混凝土梁的抗弯承载力、荷载-挠度变化关系、破坏形式、延性和抗裂性能等抗弯力学行为．试验结果表明：在短期荷载作用下,高强轻集料钢筋混凝土梁的挠度和最大裂缝宽度均满足正常使用极限状态的要求．纯弯段无腹筋的高强轻集料钢筋混凝土梁在破坏时表现出较强的脆性,延性要比同一强度等级普通混凝土梁略差．在试验分析的基础上,提出适用于高强轻集料钢筋混凝土梁的抗裂度计算方法．     

Design and validation of wireless acceleration sensor network for structural health monitoring

0IntroductionCivil engineeringstructures suffer damages caused byenvironmental loads,fatigue,caustic effect and materialaging;thus,their strength reduces inevitably during theservice time.In order to assess these damages and makeappropriate decisions to keep the structures in good ser-vice,itis essential toimplement a damage detectionstrat-egy,and the process is referred to as structural healthmonitoring(SHM)[1].In an SHMsystem,a set of sen-sors are mountedinstructuresto measurethe structure…     

基于实时数据库的分布式城市交通监控系统设计

采用实时数据库技术、分布式技术、PC and Sun Workstation结构和Visual C 6.0,设计了基于Windows平台的实时城市交通监控系统,监测系统则由一个交通监控中心和若干分中心组成.该系统的监控子系统由事件自动检测系统、通讯设备、报警系统、指示装置和实时数据库组成,事件自动检测系统由实时交通信息的采集单元和检测交通事件算法组成.监控系统有效地减少网络开销,增加系统的实时性,提高事件自动探测的工作效率.     

The utility F-box for protein destruction

A signature feature of all living organisms is their utilization of proteins to construct molecular machineries that undertake the complex network of cellular activities. The abundance of a protein element is temporally and spatially regulated in two opposing aspects: de novo synthesis to manufacture the required amount of the protein, and destruction of the protein when it is in excess or no longer needed. One major route of protein destruction is coordinated by a set of conserved molecules, the F-box proteins, which promote ubiquitination in the ubiquitin-proteasome pathway. Here we discuss the functions of F-box proteins in several cellular scenarios including cell cycle progression, synapse formation, plant hormone responses, and the circadian clock. We particularly emphasize the mechanisms whereby F-box proteins recruit specific substrates and regulate their abundance in the context of SCF E3 ligases. For some exceptions, we also review how F-box proteins function through non-SCF mechanisms.     

A genome-wide association study in Han Chinese identifies new susceptibility loci for ankylosing spondylitis

To identify susceptibility loci for ankylosing spondylitis, we performed a two-stage genome-wide association study in Han Chinese. In the discovery stage, we analyzed 1,356,350 autosomal SNPs in 1,837 individuals with ankylosing spondylitis and 4,231 controls; in the validation stage, we analyzed 30 suggestive SNPs in an additional 2,100 affected individuals and 3,496 controls. We identified two new susceptibility loci between EDIL3 and HAPLN1 at 5q14.3 (rs4552569; P = 8.77 × 10(-10)) and within ANO6 at 12q12 (rs17095830; P = 1.63 × 10(-8)). We also confirmed previously reported associations in Europeans within the major histocompatibility complex (MHC) region (top SNP, rs13202464; P < 5 × 10(-324)) and at 2p15 (rs10865331; P = 1.98 × 10(-8)). We show that rs13202464 within the MHC region mainly represents the risk effect of HLA-B*27 variants (including HLA-B*2704, HLA-B*2705 and HLA-B*2715) in Chinese. The two newly discovered loci implicate genes related to bone formation and cartilage development, suggesting their potential involvement in the etiology of ankylosing spondylitis.     

基于提高学生创新素质的动物生理学实验教学模式改革

介绍了通过建立以实验为中心的教学改革,积极向学生开放实验室,使用现代化的教学仪器、观念、方法手段,考核制度多元化,采用案例式教学等措施,培养具有较宽厚的基础知识,较强的实际操作能力和处理、解决问题能力的高素质人才。