从德政到悟道——试论《荡寇志》的经世理念

在农民斗争的强烈刺激下,俞万春分别从儒家、道家的角度提出整饬道德、贤人政治和正神降妖、悟道成仙济世良方,表现社会动荡形势下,文士矫治乱世、君臣相得、社会和谐稳定的经世理念.     

A novel BIST scheme for circuit aging measurement of aerospace chips

The avionics working environment is bad, easy to accelerate aging of circuits. Circuit aging is one of the important factors that influence the reliability of avionics, so circuit aging testing is of great significance to improve the reliability of avionics. As continuing aging would degrade circuit performance, aging can be monitored through precise measurement of performance degradation. However, previous methods for predicting circuit performance have limited prediction accuracy. In this paper, we propose a novel Built-In Self-Test (BIST) scheme for circuit aging measurement, which constructs self-oscillation loops employing parts of critical paths and activates oscillations by specific test patterns. An aging signature counter is then used to capture the oscillation frequency and in turn measure the aging state of the circuit. We propose to implement this measurement process by BIST. Experimental results show that the proposed in-field aging measurement is robust with respect to process variations and can achieve a precision of about 90%. The application of this scheme has a certain value to improve the reliability of avionics systems.     

“大学语文”教学改革的思考与实践

大学语文教育与培养大学生的人文精神相接合，是当前大学语文教学改革的一个出发点。作者结合自己的教学体会，总结了当前“大学语文”教学在教育观念、讲授方式、评价标准等方面存在的问题。在学习、借鉴国外教学方法．的基础上，介绍并提出一些改革方案和设想。     

高超声速飞行器底层性能评价指标的可行性分析

针对控制性能指标是否适用于高超声速飞行任务评价，研究了底层指标的可行性分析方法。首先分析了高超声速飞行器的模型特性，指出底层指标具备高超声速飞行器评价可行性的两点要求。根据上述要求将可行性分析转化为对于任务变量到底层评价指标的映射分析，并提出了一种基于统计实验分析的检验方法。结合高超声速飞行器模型特点，进一步设计了可行性分析流程。然后，分别以静态任务要求和速度、高度跟踪任务要求为例，对应提出频域性能指标和时域性能指标的可行性分析方法。最后针对频域性能指标评价静态任务的可行性设计仿真实验加以验证。仿真结果表明可行性分析的结论与军标观点一致，而且所提出的分析流程具有较好的可实现性。     

Integrating BDS and GPS for precise relative orbit determination of LEO formation flying

Low-Earth-Orbit(LEO) formation-flying satellites have been widely applied in many kinds of space geodesy. Precise Relative Orbit Determination(PROD) is an essential prerequisite for the LEO formation-flying satellites to complete their mission in space. The contribution of the BeiDou Navigation Satellite System(BDS) to the accuracy and reliability of PROD of LEO formation-flying satellites based on a Global Positioning System(GPS) is studied using a simulation method. Firstly, when BDS is added to GPS, the mean number of visible satellites increases from9.71 to 21.58. Secondly, the results show that the 3-Dimensional(3 D) accuracy of PROD, based on BDS-only, GPS-only and BDS + GPS, is 0.74 mm, 0.66 mm and 0.52 mm, respectively. When BDS co-works with GPS, the accuracy increases by 29.73%. Geostationary-Earth-Orbit(GEO) satellites and Inclined Geosynchronous-Orbit(IGSO) satellites are only distributed over the Asia-Pacific region; however, they could provide a global improvement to PROD. The difference in PROD results between the Asia-Pacific region and the non-Asia-Pacific region is not apparent. Furthermore, the value of the Ambiguity Dilution Of Precision(ADOP), based on BDS + GPS, decreases by 7.50% and 8.26%, respectively, compared with BDS-only and GPS-only. Finally, if the relative position between satellites is only a few kilometres, the effect of ephemeris errors on PROD could be ignored. However, for a several-hundred-kilometre separation of the LEO satellites, the SingleDifference(SD) ephemeris errors of GEO satellites would be on the order of centimetres. The experimental results show that when IGSO satellites and Medium-Earth-Orbit(MEO) satellites co-work with GEO satellites, the accuracy decreases by 17.02%.     

半球谐振陀螺控制及补偿技术

首先介绍了半球谐振陀螺(HRG)发展历程，分析国内外研究现状并总结了现阶段半球谐振陀螺发展趋势；其次讨论了半球谐振陀螺控制技术，包括不同条件下驻波的激励检测方法、陀螺工作模式、驻波控制方案，以及一种全新的频率调制控制方案；另外，分别以驻波调制补偿、电极增益补偿、多陀螺补偿以及环境载荷补偿为例，分析了控制方案补偿、器件补偿、系统补偿以及场景补偿等四种半球谐振陀螺补偿技术；最后通过对现有技术和研究的分析，提出了半球谐振陀螺控制及补偿技术未来的发展方向。     

EVA与现金流量在企业财务战略中的影响及应用

财务战略是企业战略的隶属部分 ,在企业战略中居于核心地位。EVA及现金流量与资本联系紧密 ,反映了企业创造的价值和资金的运转状况 ,两者已经成为衡量企业绩效的最重要指标。结合EVA和现金流量在财务管理中的作用 ,运用财务状况四分图区分企业所处的财务状况 ,为处于不同财务状况的企业提供相匹配的财务战略。     

交互图在Rose和Together中实现的比较

交互图是面向对象分析设计中一种对系统动态方面进行建模的图,顺序图是交互图中的一种,主要用于强调对象间消息的时间顺序,而且它能够容易地转换为协作图,它在不同的工具软件中实现有所差异.从它具体的实现可以看出工具体现的思想,Rose体现和开拓RUP、UML的思想,而Together是执行.     

发汗冷却中多孔壁面添质通道流动的实验和数值研究

发汗冷却相比常规主动冷却方式是冷却效率更高、覆盖性能更好的热防护技术。为了研究发汗冷却中的添质流动现象,通过带有红外热成像技术的发汗冷却实验平台,在雷诺数1.35×105和总温373K的来流条件下对金属颗粒烧结多孔材料的发汗冷却效果进行了研究,得到了在不同注入率条件下多孔壁面的温度分布,结果显示平均冷却效率与注入率之间近似呈线性关系,当氮气注入率为33.5%时平均冷却效率接近0.45。通过对比单温度方程的局部热平衡模型和双温度方程的局部非热平衡模型的模拟结果,显示局部非热平衡模型能正确反映发汗冷却过程中的换热过程,模拟结果和实验数据具有较高吻合度。模拟结果表明:多孔壁面边界层随注入率的增大而增厚,边界层增厚是发汗冷却具有较高冷却效率的原因之一。     

静轴式压气机结构设计与静力学性能分析

为满足小型无人机和导弹等航空器使用的航空发动机的要求,基于轴流式压气机结构,提出了一种主轴固定、内静子、外转子的新型“静轴式压气机”构型。通过对压气机基元级运动模型简化分析,建立了空气在压气机基元级压缩过程的动力学模型,确定两段压气机与中间泄气隔断结构参数,进一步计算得出各级出口温度变化曲线。结合理论计算,对静轴式压气机部件进行三维建模,运用Fluent软件验证基元级增压原理,并在Workbench软件中开展关键转子部件的静力学仿真与性能分析。结果表明：静轴式压气机整体采用前四级后五级的九级压缩方式,总压比达到12,静温变化量达到51.5℃,满足高增压比、分段燃烧的需求;压气机基元级数值模拟结果满足增压原理,应力应变满足强度要求,转子结构设计最大变形量较传统压气机减小,可以满足小型飞行器用压气机的设计要求。