摘要：Beam emittance reduction is an effective method to increase the brightness of a synchrotron light *** wiggler can play a role in the beam emittance reduction by increasing the horizontal damping partition number.A replacement of the quadrupoles in the arc section with short combined function dipoles will construct a single-periodic Robinson wiggler in the SSRF storage *** scheme provides a lower beam emittance,without occupying any straight *** analysis is presented in this paper.

摘要：为满足电子领域中对芯片边缘缺损情况的检测要求,针对金属材质的反光特性,提出显微视觉照明系统来获取漫反射照明条件。采用高等数学中排列组合方法改进中值滤波器,弥补高斯滤波器自适应性不强的问题。在计算梯度幅值上用3×3的窗口代替原有2×2窗口,在4个不同方向上对其进行差分,降低错检率,减少边缘丢失现象。实验结果表明,该算法能够去除图像伪边缘,图像边缘轮廓更清晰,峰值信噪比较高,有效抑制了噪声,处理速度提高约30%。

摘要：为推动我国棉花打顶作业机械化发展进程,设计了基于PLC伺服控制的3MD-3型棉花打顶机,包括3套单体仿形的打顶机构及1套伺服控制系统。该棉花打顶机控制系统通过触控屏设定棉花打顶高度及打顶速度等参数,结合传感器获取的棉株顶端位置,通过PLC控制打顶刀动作实现自动打顶。通过试验,对比检验了双刀打顶方式的可靠性,验证了行驶速度与提升控制频率间的正相关性。结果表明:该棉花打顶作业效率0.36hm^2/h时,打顶的准确率可达到8 5%。

摘要：为了验证柴油发电机组的带载性能,设计了通过专用加载装置来进行试验的方案。通过突加和突卸负载,考量了机组的瞬态调压特性。该方案方法简单,可操作性强,试验结果一目了然,能够为用户验收柴油发电机组及其控制系统提供准确的依据。

摘要：为快速推进高速磁浮交通系统研发进程,节约研发成本,研制包含悬浮和导向控制器的磁浮交通车线桥耦合动力学半实物仿真测试平台。平台由上位机、实时仿真平台(下位机)、接口箱、悬浮和导向控制器组成。上位机利用SIMPACK和Matlab/Simulink软件分别建立磁浮车辆动力学、电磁悬浮导向、轨道梁动力学和轨道不平顺等模型,将数值模型导入下位机在环仿真,由管理软件监控仿真状态并记录数据。利用平台开展车辆起浮、直线加速运行、单点悬浮故障以及过平面曲线工况的动力学测试仿真。仿真结果表明,数值模型合理,仿真方法合适,可用于600 km/h高速磁浮交通系统优化设计及性能评估。

摘要：Based on the Canadian Standards Association (CSA) criteria,105 pullout specimens were tested to investigate the effect of different rib geometries on bond strength of glass fiber reinforced polymer (GFRP) rebars embedded in concrete. Two kinds of conventional reinforcing rebars were also studied for comparison. Each rebar was embedded in a 150 mm concrete cube,with the embedded length being four times the rebar diameter. The experimental parameters were the rebar type,rebar component,rebar diameter,rebar surface texture,rib height,rib spacing and rib width. Theoretical analysis was also carried out to explain the experimental phenomena and results. The experimental and theoretical results indicated that the bond strength of GFRP rebars was about 13%～35% lower than that of steel rebars. The bond strength and bond-slip behavior of the specially machined rebars varied with the rebar type,rebar diameter,rebar surface texture,rib height,rib spacing and rib width. Using the results,design recom-mendations were made concerning optimum rib geometries of GFRP ribbed rebars with superior bond-slip characteristics,which concluded that the optimal rib spacing of ribbed rebars is the same as the rebar diameter,and that the optimal rib height is 6% of the rebar diameter.

摘要：Semiconductor technology continues advancing, while global on-chip interconnects do not scale with the same pace as transistors, which has become the major bottleneck for performance and integration of future giga-scale ICs. Thre dimensional （3D） integration has been proposed to sustain Moore＇s law by incorporating through-silicon vias （TSVs） to integrate different circuit modules in the vertical direction, which is believed to be one of the most promising techniques to tackle the interconnect scaling problem. Due to its unique characteristics, there are many research opportunities, and in this paper we focus on the test wrapper optimization for the individual circuit-partitioned embedded cores within 3D System-on- Chips （SoCs）. Firstly, we use existing 2D SoCs algorithms to minimize test time for individual embedded cores. In addition, vertical interconnects, i.e., TSVs that are used to construct the test wrapper should be taken into consideration as well. This is because TSVs typically employ bonding pads to tackle the misalignment problem, and they will occupy significant planar chip area, which may result in routing congestion. In this paper, we propose a series of heuristic algorithms to reduce the number of TSVs used in test wrapper chain construction without affecting test time negatively. It is composed of two steps, i.e., scan chain allocation and functional input/output insertion, both of which can reduce TSV count significantly. Through extensive experimental evaluations, it is shown that reduce the number of test TSVs dramatically, i.e., as much as 26% in comparison with the intuitive method. the test wrapper chain structure designed by our method can 60.5% reductions in comparison with the random method and

摘要：开展了4个翼缘削弱的钢管混凝土柱穿入式组合节点抗震性能与三维实体有限元精细化模型分析。在混凝土三轴塑性损伤和钢材混合强化模型基础上,进一步引入钢材的韧性损伤模型,探讨了钢梁削弱程度对节点抗震性能与破坏形式的影响规律,结果显示引入钢材韧性损伤的有限元模型分析结果与试验结果更加吻合,且钢梁削弱程度降低了该节点的刚度、承载力和耗能。随后对不同钢梁尺寸和柱端拉筋强构造下的组合节点进行了承载力、刚度和塑性耗能分配与失效机制的影响规律分析,分析结果表明:穿入式节点分别在梁-柱抗弯承载力比介于1.66~2.11、梁-柱线刚度比介于1.90~1.96、梁-柱截面刚度比介于1.16~1.21时,将由梁耗能向柱耗能转变;柱端拉筋强构造技术后,由于拉筋直接约束混凝土,大幅度提升了柱端抗弯承载力和耗能能力,组合节点在高轴压比时仍维持梁端失效破坏模式;根据《建筑抗震设计规范》,梁-柱抗弯承载力比取值小于1时为强柱弱梁,这对穿入式组合节点强柱弱梁的定义较为保守。

摘要：针对非平衡大数据当中进行聚类较为繁琐且聚类结果准确度不高的问题,提出一种以动态网格为基础的密度聚类方式。通过动态网格的划分,并设置相应网格密度的阈值,进行网格的自适应生成,实现相应的密度聚类效果。算法通过样本训练与测试对用户的异常轨迹进行监测,提出类相似的概念对不同的格簇进行划分,同时将噪声当成异常数据进行检测,保证数据检测的全面性。经过实际实验验证,改进算法对于非平衡大数据等问题的处理效果更优,精确度更高。

摘要：针对大型复杂构件零件装配周期长、质量差的难题,分析了大型复杂结构件的结构特点和装配要求,开发了虚拟装配仿真系统,通过虚拟装配仿真指导实际装配的方法,利用工程实例对系统的可行性进行了验证。结果表明:该系统能够根据零件检测数据重构零件模型,对零件重构模型进行装配过程仿真,并对装配体进行间隙分析,将分析结果以色图的形式进行显示及以数字的形式进行输出,为实际装配提供数据指导。