“北斗”卫星导航系统仿真与全球覆盖分析

为了解“北斗”卫星导航系统（BDS）的星座分布及其正式运行后卫星在全球范围内的覆盖情况,依据BDS卫星轨道参数,使用卫星工具包（STK）构建了完整的BDS空间星座,对BDS卫星轨道信息、可见性以及对地覆盖品质进行分析。在对可见性及覆盖品质的分析中,分别仿真分析了在4个不同的城市和全球范围进行观测得到的几何精度因子（GDOP）和导航精度等参数性能。研究结果对分析BDS系统的服务性能以及提高BDS的导航精度有一定的参考意义。     

China’s Macroeconomic Outlook and Risk Assessment: Counterfactual Analysis,Policy Simulation,and Long-Term Governance — A Summary of Annual Report (2015–2016)

This summary report highlights the confluence of continued downward pressures and deflation scares in the face of looming uncertainty in China’s key macroeconomic landscapes. Counterfactual analyses and policy simulations are conducted, in addition to benchmark forecasts, based on IAR-CMM model and taking into account both cyclical and secular factors. Economic deceleration is projected to continue in the short to medium term, with real GDP growth declining to 6.3% (5.5% using more reliable instead of official data) in 2016 and facing a significant risk of sliding further down in 2017. Five key factors contributing to the weak outlook, additional to frictions and impediments associated with economic transition/restructuring and lackluster domestic/external demands, are identified, including: lack of new growth/ development engine, exhaustion of government-led driving force, the crowding-out of private sectors by state-owned enterprises (SOEs) with excess capacity\capital overhang, nonperforming government sectors and officials, and twist or misinterpretation of the “New Normal.” A root cause of these problems, lying with sluggishness in China’s transformation into a market based economy, has to do with overpowered government but underpowered market in resource allocation and government underperformance in enforcing integrity and transparency in the marketplace and in providing public goods and services. At the nexus between inclusive growth and institutional transformation are market oriented and rule of law governed structural reforms and harmonious development. As such, fundamental institutional reforms that dialectically balance demand and supply side factors and properly weigh short run stabilization against long run development should be elevated to the top of the agenda.     

用Visual Foxpro 6.0开发连杆机构动画数据库

介绍了用VisualFoxpro6.0开发连杆机构运动模拟数据库和用VisualFoxpro6.0开发连杆机构运动模拟数据库的一些关键性问题,包括动画实现的基本原理、数据库中机构参数表的结构、如何在表单集上绘制机构运动简图、机构数据库的维护等。该软件既可显示动态的机构又可显示运动分析图表和曲线,无论对机械原理及机构学的教学还是对连杆机构综合的科研等诸方面都提供了很大的帮助。     

Farm technology and technical efficiency: Evidence from four regions in China

In this paper we fit stochastic frontier production functions to data of Chinese farms grouped into each of four regions—North, Northeast, East, and Southwest—over 1995–1999. These frontier production functions are shown to have statistically different structures, and the elasticities provide some evidence of diminished marginal products of chemical inputs in the East and capital services in the North and Southwest. Labor has a low elasticity except in the North. Standardized technical efficiency scores are estimated for the farms and are shown to have the same structure across regions and to be related to the age of the household head, land fragmentation, and the village migration ratio, controlling for year effects and village or regional fixed effects.     

基于单片机的小区单元门禁系统的设计

根据住宅小区安全性的要求,提出一种基于单片机的小区单元门禁系统的设计方案。系统能实现密码的输入、清除、显示、修改,并有开锁、报警、通话功能。完成了系统的硬件电路设计和C语言编程,用proteus仿真软件进行了仿真。系统克服了传统机械锁的缺点,具有成本低廉、功能实用的特点。     

CFG桩+泡沫混凝土解决软基桥头跳车的联合应用研究

为了减小路桥过渡段的差异沉降,缓解软土地区的桥头跳车问题,提出了一种采用CFG桩复合地基联合换填泡沫混凝土加固软基的方案。依托实际工程案例,采用有限元软件MIDAS GTS/NX建立了CFG桩复合地基工况模型与原始工况模型,检验了CFG桩复合地基的有效性,然后建立了CFG 桩联合台后换填泡沫混凝土方案的模型进行固结沉降分析,并验证了两者联合应用的优越性。研究结果显示：1）CFG桩复合地基对于软基的加固效果显著,其工期沉降比原始工况减少了18.32 cm;2）CFG桩复合地基加固软基时,台后换填泡沫混凝土使桥台与路面的台阶型差异沉降相较于台后普通路基填土工况减小了0.72 cm,对于桥头跳车问题的治理效果良好;3）模拟结果与工程实测沉降数据对比误差极小,说明了有限元模拟的可靠性。研究结果有效解决了常见的桥头跳车问题,方案具有更安全、环保、可靠的特点,可为软土地区的路桥过渡段工程提供一定的理论参考与借鉴。     

行业协会的市场作用——基于信号传递模型的分析

文章研究了行业协会在企业与消费者的不完全信息动态博弈中所起的作用,在信号传递模型的基础上,分析证明了行业协会作为传递企业品质的一种信号,会改变企业的成本结构与市场的信息结构,从而有助于市场和消费者甄别企业的优劣.随后,文章利用一个行为模拟实验验证了上述结论,同时分析了行业协会存在的必要性,并进一步指出,行业协会需要更多地将职能集中在"为优质企业服务、客观宣传企业商誉和自律自裁"上,才能保证协会的健康持续发展,并推动产业良好发展、增进消费者福利.     

资本投入一定有效吗——基于跨省数据的实证研究

本文运用跨省数据和随机前沿分析方法实证分析了中国资本投入对经济效率变化的具体影响。分析结果表明,中国的资本投入对经济效率的提高并没有起到正面的促进作用,其原因是中国资本投入国有企业比重过高制约了资本对技术效率提高的贡献。当前经济刺激政策能否取得成功和金融危机后中国经济能否可持续发展的关键,是资本能否真正投入到更具效率的中小企业和民营企业中去。     

《税务代理实务》教学模式改革之探索

《税务代理实务》是一门综合性、应用型课程。本文在分析《税务代理实务》教学现状的基础上,明确提出学以致用是该课程教学目标的根本定位,并结合《国家中长期教育改革和发展规划纲要(2010-2020)》总体战略目标的要求,从引入CDIO教育理念、重构教学模式,重视案例教学法的应用和强化模拟仿真训练三方面提出了教学改革建议,以期不断完善税务本科教学体系建设,为社会培养高层次、应用型税务人才。     

甲、丙类级联调谐放大器的系统设计与仿真分析

目前,甲、丙类调谐放大器的理论研究较为离散,缺少多级级联 系统设计的理论分析与测试方法。根据设计案例指标需求,结合理论分析,采用Multisim进 行仿真与测试,对级联系统设计中元件参数测量、电路参数计算、系统稳定性调整、工作状 态调整、效率计算、阻抗匹配等关键问题进行了详细解析。仿真实验表明设计符合指标要求 ,可作为甲、丙类多级级联调谐放大器系统设计的参考。