摘要：Six plant MARs isolated from tobacco and Arabdiposis were investigated for their ARS activity in yeast. The results showed that among the six plant MARs, only TM1 and AM4 had strong ARS activity which was almost the same as that of ARS from yeast chromosome. In order to further identify the core region of the two MARs for the ARS activity, a series of subclones were created by PCR strategy, and the corresponding subclones were designated as TM1-1, TM1-2, TM1-3, AM4-1, AM4-2 and AM4-3, respectively. Our studies revealed that TMI-3 and AM4-3 not only had higher ARS activity, but also displayed higher transformation frequency, plasmid stability and growth rate compared to their intact MARs, TM1 and AM4. These data present an important clue for further elucidating the relationship between MAR and ARS.

摘要：无机质增强植物纤维高分子复合材料已成为功能型复合材料领域中的重点关注对象,其具有性能优异、附加值高、应用领域广等优势。系统综述了国内外关于蒙脱土、云母、氧化物、碳酸钙、滑石粉、石墨烯、炭黑及碳纳米管等无机质增强植物纤维高分子复合材料在阻燃、耐老化、导电及电磁屏蔽等功能方面的研究现状和进展,针对无机质增强复合材料在功能性拓展、无机质与基体材料复合、功能性内在机理分析等方面提出存在的问题,并展望功能型复合材料领域的发展前景,以期为进一步推动高附加值功能型复合材料的研究提供科学理论依据。

摘要：研究了基于NiosⅡ嵌入式软核处理器的全数字通用信号源的SOPC设计与实现方法,阐述了该信号源的总体设计方案,重点介绍了FPGA中自定义组件的设计,信号发生模块的设计,给出了信号发生模块的顶层设计原理图及时序仿真结果。该信号源可以灵活地实现任意波形输出,并且输出频率稳定、准确,波形质量好和输出频率范围宽,具有很高的应用价值。采用SOPC方案进行系统设计,充分利用FPGA的可编程性,整个开发过程变得灵活方便。

摘要：为了YBBP 500-2500 kW 10 kV隔爆型高压三相异步电动机能够在ExdbII CT4 Gb环境下使用,同时变频范围是25~60 Hz,电机保证转速在3500 r/min(约58.3 Hz)时功率500 kW的情况下长期运行,现通过论证电磁、结构设计要点,经试验验证此电机设计方案满足用户需求。同时还降低了2极电机振幅,转子铁心采用拉杆结构,保证了电机空载振动值在1.0 mm/s以下。

摘要：针对国土调查数据管理较为混乱的现状,本文结合国土调查数据特征及用户需求,利用GIS和大数据可视化等技术手段,构建国土调查数据管理平台,分别从数据体系建设、图表和地图可视化、系统平台架构3个方面对国土调查数据管理平台进行设计实现,对平台功能及应用优势进行详细分析,并通过某地区平台应用进行综合验证,在数据成果大屏展示、可视化专题地图、自动化分析报告生成等方面均取得较为理想的应用效果,直观展示了国土调查数据的空间分布、变化趋势、结构特征等,大大提升了研究区国土调查数据管理水平,为自然资源管理体系建设和科学决策提供了基础支撑。

摘要：基于正交试验设计方法对高速公路软土路基沉降的离散元模拟数据进行极差分析,结果表明,各影响因素对高速公路软土路基沉降的敏感性大小依次为:软土厚度>路基坡度>地基承载力;并据此提出了高速公路软土路基沉降的控制措施。基于最小二乘法原理,建立了高速公路软土路基沉降的回归预测公式,定量描述了高速公路软土路基沉降与影响因素之间的关系。

摘要：以配制设计强度为C35的大流动性废砖骨料混凝土为目标,以废砖骨料体积取代率为变量,采用预湿废砖骨料的方法制备若干组标准立方体和棱柱体试件,研究不同废砖骨料体积取代率对其混凝土立方体抗压强度、轴心抗压强度、劈裂抗拉强度、峰值应变、耗能系数等性能指标的影响。研究结果表明:废砖骨料的取代使混凝土的强度均有所降低,取代率在0~20%及60%~80%时,强度降低较为明显;当取代率由20%变到40%,由80%变到100%时,峰值应变变化较为显著;对于耗能系数,当取代率在0~40%时,其减小幅度较为显著,当取代率为40%~100%时,耗能系数变化不大,维持在0.65左右。

摘要：根据数百个洁净厂房的设计、施工实践经验,深入研究了洁净厂房各类深化设计节点构造做法,内容涵盖洁净工程的十几个主要分部分项工程。相关研究成果,填补了国内行业空白。课题成果出版发行以后,可以为国内洁净工程项目的深化设计工作提供指导和借鉴。

摘要：Rotational atherectomy is an effective treatment for severe vascular calcification obstruction,and relies on high-speed grinding(typically 130,000–210,000 r/min)with miniature grinding tools to remove calcified tissue and restore blood ***,reports of intraoperative complications are common because of the grinding force,temperature,and debris directly acting on the body during the grinding process,which can easily cause damage to *** this study,three novel grinding tools were designed and fabricated and a series of experiments have been conducted to analyze the effects of tool geometry and parameters on grinding performance,that is,force,temperature,and specimen surface *** results show that these tools can effectively remove simulated calcified tissue and that they have two motions,rotation and revolution,in the *** higher rotational speeds,grinding force and temperature increase noticeably,while the amount of debris decreases *** addition,by observing the surface morphology of the specimens,we concluded that the material removal rate per unit time is influenced by both rotational speed and tool geometry,and that high rotational speed and a rough tool surface can improve the material removal rate efficiently.

摘要：为深入贯彻人力资源社会保障部颁布的《幼儿教育专业国家技能人才培养工学一体化课程标准(试用)》,本文参考一体化课程教学改革试点院校的经验,以“学校为主、企业为辅”校企合作运行机制原则,围绕就业导向和职业特征,结合本校22秋和23秋幼儿教育专业学生的美术教学实践,进行了美术一体化课程学习内容的二次设计,并在实际教学中付诸实践。期待这些探究与实践对促进中等职业院校幼教生专业成长、幼儿教育健康发展起到推动作用。