摘要：为提高多级轴流压气机气动性能,采用轴流压气机叶片全三维粘性反问题求解方法,对多级轴流压气机反问题级间气动匹配设计方法进行了研究。以压气机级出口旋流角为设计目标,叶片表面载荷分布为设计对象,通过动量矩守恒方程,建立起叶片出口旋流角与叶片表面载荷分布的关系,从而实现计算过程中载荷的自动调整,修正气流在叶片出口旋流角分布。为了让压气机每一级都工作在设计给定的进口条件下,对上游级静子叶片进行反问题改型设计,使得其出口旋流角分布满足设计给定值。为了验证方法的有效性,采用四级高压压气机作为算例,对其初始设计进行反问题匹配改型设计。通过计算,修正了三个级间位置的旋流角分布,改善了下游级进口工作条件。气流在改型后压气机内部流动更加符合设计意图,级与级之间流动匹配更好。与原型相比,总压比和绝热效率分别提高了2.8%和1.3%,验证了方法的有效性。

摘要：With more large-scale scientific computing tasks being delivered to cloud computing platforms, cloud workflow systems are designed for managing and arranging these complicated tasks. However, multi-tenant coexistence service mode of cloud computing brings serious security risks, which will threaten the normal execution of cloud workflows. To strengthen the security of cloud workflows, a mimic cloud computing task execution system for scientific workflows is proposed. The idea of mimic defense contains mainly three aspects: heterogeneity, redundancy, and dynamics. For heterogeneity, the diversities of physical servers, hypervisors, and operating systems are integrated to build a robust system framework. For redundancy, each sub-task of the workflow will be executed simultaneously by multiple executors. Considering efficiency and security, a delayed decision mechanism is proposed to check the results of task execution. For dynamics, a dynamic task scheduling mechanism is devised for switching workflow execution environment and shortening the life cycle of executors, which can confuse the adversaries and purify task executors. Experimental results show that the proposed system can effectively strengthen the security of cloud workflow execution.

摘要：Active fault creep slip induces deformation of rock mass buried deeply in fault zones that significantly affect the operational safety of long linear projects passing through *** distribution patterns of rock masses in active fault zones which have been investigated previously are the key design basis for such ***,a discrete element numerical model with different fault types,slip time,dip angles,and complex geological features was established,and then the creep slip for normal,reverse,and strike-slip faults were simulated to analyze the displacement distribution in the fault rock mass.A disk rotation test system and the corresponding laboratory test method were developed for simulating rock mass displacement induced by creep slippage of faults.A series of rotation tests for softand hard-layered specimens under combined compression and torsional stress were conducted to verify the numerical results and analyze the factors influencing the displacement *** S-shaped displacement distribution independent of fault dip angle was identified corresponding to reverse,normal,and strike-slip *** results indicated that the higher the degree of horizontal extrusion,the softer the rock mass at the fault core,and the higher the degree of displacement concentration in the fault core;about 70%of the creep slip displacement occurs within this zone under 100 years of creep slippage.

摘要：研究考虑有可靠性参与的二级物流服务供应链的优化与协调.研究表明:在研究由第四方物流集成商与第三方物流提供商构成的二级物流服务供应链时,加入提供商的可靠度,利用委托代理理论建立一种基于委托代理理论的有可靠性参与的优化契约模型,有利于提高供应链整体的最优物流能力订购量,提高集成商和提供商的利润;提供商的可靠度与提供商、物流服务供应链的期望利润负相关,与供应商的期望利润正相关.

摘要：双约束和现有三约束重力模型在不同人群对出行阻抗的认知方面均采取平均化处理的方法,与实际出行情况有明显的差异.针对不同人群对出行阻抗的认知程度不同,提出了基于人群特征的三维约束重力模型改进方法.在出行生成环节中将不同人群分开,设计不同人群的出行量预测算法.在重力模型改进中,按照不同人群对第三维约束的接受程度,对人群出行量进行分类并标定相应的缩放系数.以岳阳市交通分布模型为例,对长距离出行约束进行分析,并分别应用双约束和改进的三维约束重力模型进行计算,结果说明了改进的三维约束重力模型的可行性与优越性.

摘要：新中国工业题材油画创作是社会主义物质文明与精神文明建设的艺术再现,是新中国自强不息的民族精神和国家形象的体现。宏大叙事结构中“新工业风格”油画创作,弘扬了革命的浪漫主义和乐观的现实主义精神,分析了绘画图式如何着眼于现实、表达于现实、抒情于现实的创作历程,表达了社会主义建设时期工业发展的时代审美节律。论文着重论述了工业题材油画创作以宏大叙事的方式展现新中国的时代风貌,探讨了工业题材油画创作七十多年来宏大叙事创作方式的产生、发展、消解、重构与再生,并以新的理论视角研究了当代工业题材油画创作的理论与实践,以及“新工业风格”油画创作风格和美学意味的形成。

摘要：为了满足小型风力发电技术的研究需要,分析了风力机的运行特性及采用直流电动机转矩闭环控制模拟风力机的可行性,设计了基于直流电动机的小型风力机模拟器,并给出了采用西门子调速系统驱动直流电动机的模拟器实现方案及基于永磁同步发电机的测试系统,进行了实验研究。实验结果表明,所设计的风力机模拟器可以模拟小型风力机的转矩-转速特性和功率-转速特性,为在实验室条件下研究风力发电技术的原动机问题提供了一个实用的解决方案。

摘要：通过2个基于目标位移角分别为1.0%和1.5%设计的、轴压比为0.4的T形截面剪力墙拟静力试验,研究T形截面剪力墙基于目标位移角设计方法的有效性,以及研究基于不同目标位移角设计的剪力墙的破坏形态、滞回性能及变形能力等抗震性能。试验结果表明:2个试件的破坏形态均为压弯破坏,受拉端纵筋屈服,腹板端混凝土压溃及纵筋压曲、拉断,翼缘端少量混凝土保护层脱落;试件的顶点水平力-位移滞回曲线较为饱满,峰值承载力试验值大于规范计算值,翼缘受拉时承载力更大,翼缘受压时等效刚度退化较缓慢;试件翼缘端未设置约束边缘构件,腹板端约束边缘构件的长度小于现行规范的规定,2个试件的极限位移角试验值分别为按材料强度实测值计算的目标位移角的1.33倍和1.25倍;可采用基于目标位移角的方法,设计高轴压比T形截面剪力墙约束边缘构件的长度及配箍特征值。

摘要：介绍了连续光谱地表反射特性自动观测辐射计(SCR)的光机系统设计.SCR辐射计的光谱范围为400~2 400 nm,能够实现地表反射率的长期自动观测.所设计的SCR辐射计使用经过定标的漫反射参考板作为反射率标准,漫反射参考板通过转臂自动切入、切出测量光路.为保证参考板在野外的长期适用性,设计了参考板清洁机构.对易发生失效的转臂进行静力学分析.结果表明:转轴位置会发生应力集中,且距离转轴位置越远,变形量越大,变形引起的参考板水平误差在0.3°以内,满足应用需求.为验证SCR辐射计测量数据的准确性和仪器的可靠性,设计了SCR辐射计和SVC光谱仪的比对试验.试验结果表明:两台仪器所测量的反射率具有相同的变化趋势,二者偏差普遍在±1%以内,最大偏差在±3.5%以内.SCR辐射计能够实现较高精度的反射率数据自动测量,在卫星遥感器外场自动化定标和高频次定标方面具有重要应用前景.

摘要：We describe the footprint and input catalog for bright nights in the LAMOST Pilot Survey, which began in October 2011. Targets are selected from two stripes in the north and south Galactic Cap regions, centered at δ = 29°, with 10° width in declination, covering right ascensions of 135° to 290° and -30° to 30° re- spectively. We selected spectroscopic targets from a combination of the SDSS and 2MASS point source catalogs. The catalog of stars defining the field centers （as re- quired by the Shack-Hartmann wavefront sensor at the center of the LAMOST field） consists of all V 〈 8m stars from the Hipparcos catalog. We employ a statistical selection algorithm that assigns priorities to targets based on their positions in mul- tidimensional color/magnitude space. This scheme overemphasizes rare objects and de-emphasizes more populated regions of magnitude and color phase space, while en- suring a smooth, well-understood selection function. A demonstration of plate design is presented based on the Shack-Hartmann star catalog and an input catalog that was generated by our target selection routines.