摘要：汶川特大地震后,交通运输部颁布了新的《公路桥梁抗震设计细则》,采用了两水平设防,两阶段设计的抗震设计理念,由单一的强度设计修改为由强度和变形等多指标控制的抗震设计方法。但是,对于现役钢筋混凝土桥墩而言,如何通过科学的抗震加固方法来增加其变形能力乃是提高我国整体桥梁结构抗震水平的关键。采用新型材料PUFA材料,对现役钢筋混凝土桥墩进行了抗震加固设计。为了验证其抗震加固效果,利用OpenSees软件对每个加固模型分别进行了PUSHOVER数值解析,并与常用的混凝土加大截面法和粘贴碳纤维加固法的加固效果进行分析比较。研究结果表明:利用PUFA进行抗震加固不仅可以切实提高钢筋混凝土桥墩的韧性,而且比常规的抗震加固方法具有更好的抗震加固效果。

摘要：沥青玛蹄脂碎石混合料(SMA)成功并且有效地应用于多国路面面层。针对纳黔高速公路,采用当地集料设计SMA。通过两种粗集料(石灰岩、玄武岩)的不同配比作为分析对象,测试(马歇尔稳定度、动稳定度、低温弯曲试验、构造深度、摩擦系数)得到沥青SMA体积参数和性能指标。分析得出的SMA是符合工程需要的优质面层材料,具有良好的抗滑能力,低温抗裂性能和良好的耐久性。结果表明:不同的集料配合比显著地改变了SMA混合料的性能。

摘要：In this paper, four new hybrid digital circuit design techniques, namely, hybrid multi-threshold CMOS complete stack technique, hybrid multi-threshold CMOS partial stack technique, hybrid super cutoff complete stack technique and hybrid super cutoff partial stack technique, have been proposed to reduce the subthreshold leakage power dissipation in standby modes. Techniques available in literature are compared with our proposed hybrid circuit design techniques. Performance parameters such as subthreshold leakage power dissipation in active and standby modes, dynamic power dissipation and propagation delay, are compared using existing and proposed hybrid techniques for a two input AND gate. Reduction of subthreshold leakage power dissipation in standby mode is given more importance, in comparison with the other circuit design performance parameters. It is found that there is reduction in subthreshold leakage power dissipation in standby and active modes by 3.5× and 1.15× respectively using the proposed hybrid super cutoff complete stack technique as compared to the existing multi-threshold CMOS (MTCMOS) technique. Also a saving of 2.50× and 1.04× in subthreshold leakage power dissipation in standby and active modes respectively were observed using hybrid super cutoff complete stack technique as compared to the existing super cutoff CMOS (SCCMOS) technique. The proposed hybrid super cutoff stack technique proved to perform better in terms of subthreshold leakage power dissipation in standby mode in comparison with other techniques. Simulation results using Microwind EDA tool in 65 nm CMOS technology is provided in this paper.

摘要：针对乌拉草/棉/维纶赛络纺包芯纱存在毛羽较多和条干较差等问题,加装导纱器引入外包缠纱,设计一种改善其条干和减少毛羽的新型纺纱方法:改进型赛络菲尔纺。对影响纱线性能较大的纱线捻系数与导纱间距进行了实验,并以断裂强度、断裂伸长率、毛羽指数和条干均匀度为性能评价指标,对改进型赛络菲尔纺制备的乌拉草/棉/维纶复合纱的工艺进行模糊综合评价。结果表明:捻系数对纱线性能影响顺序依次为400、380、360、340;改进型赛络菲尔纺在单纱间距为10 mm,捻系数为400时,复合纱的综合性能最好,与传统赛络菲尔纺工艺制备的包芯纱对比,毛羽指数下降了73.49%,条干不匀率减小了29.05%。

摘要：需求响应公交(DRT)具有可变路线和灵活时间表,作为常规公交有效补充,近年来得到广泛应用。文章试图研究巴基斯坦卡拉奇市在当前公交占有率较低的情况下,分析引入DRT的可行性。通过设计行为选择实验对该市居民进行(SP)偏好调查,建立多项Logit模型解析其影响因素。结果显示,现有常规公交使用者转移使用需求响应公交的意愿较低,非日常公交使用者有较高意愿使用DRT服务。等待时间和取消费用的影响较为有限,因此很难通过减少等待时间、降低取消费用等方法来显著提高DRT竞争力。

摘要：本指南根据一个致力于中枢神经系统动静脉畸形（arteriovenousmalformation，AVM）患者评估和治疗的多学科专家组共识制定。该报道标准为临床试验设计以及那些希望报道脑AVM血管内治疗的临床研究人员提供了一个样板。不同治疗方案的直接比较对于医疗诊治的标准化、良好治疗转归的最大化以及新方法和新技术的评估至关重要。

摘要：Five varieties of durum wheat were crossed in full diallel fashion through 2010/2011 growing season. The five parents and their 20 F1 progenies were grown in 2011/2012 at the farm of faculty of agricultural and forestry, Duhok university, Iraq, using randomize complete block design with three replications to estimate heterosis, heritability and some genetic parameters for yield and its components. The results showed highly significant difference among genotypes for all studied traits. The parent Um Raby-5 had a positive general combining ability effect for most traits including grain yield. The crosses (Kokorete71 ? LD – 357E), (Crezo ? Um Raby-5), (Cimeto ? Um Raby-5), (Cimeto ? crezo) and (Cimeto ? Kokorete 71) exhibited significant desirable specific combining ability effect for most traits. The dominance was greater than additive almost traits. Heritability inbroad sense was high but heritability in narrow sense was low. The expected genetic advance as percent of traits mean was low for all traits. Most crosses showed significant positive heterosis for most traits and two crosses, (Crezo Cimeto) and (Cimeto Um Raby-5) had the highest positive heterosis for the most studied traits including grain yield.

摘要：背景:绝大部分小样本的疾病干预措施,如肝移植,都不太可能开展临床研究。当缺少循证医学证据时,专家共识能提供更为精细的治疗指导。例如对肝移植受体心血管风险的处理,截至今日,都没有一部基于循证医学证据的临床指南。然而,即便形成了专家共识,对这些实践指导意见的执行也往往是不充分且滞后的。我们提出了一种新型混合方法,Northwestern Method,用于那些缺少循证医学证据的临床实践指导意见的制定。我们通过针对肝移植受体心血管风险的处理所制定的实践指导意见,来阐述该方法的应用。方法:Northwestern Method由4部分组成,分别是(1)对已有的基于循证医学证据的相关指南进行改编;(2)对实践指南意见形成专家共识;(3)明确妨碍实践指导意见在临床中推行的因素;(4)执行和推广实践指导意见的建议。该方法是以用户为中心的迭代方法,在实践指导意见的设计和形成过程的每个环节,都应充分考虑包括患者在内的终端用户的所需、所想及顾虑。结论:Northwestern Method采用一种混合方法,将临床实践各方代表汇集在一起制定临床实践指导意见,充分考虑了患者、护理人员及医生等直接影响实践指导意见执行效果的人员各自的需求和喜好。我们提出了一个假设,即终端用户尽早参与到指导意见的制定过程,有助于指导意见在临床实践中的有效贯彻。