减缓渐开线齿轮支座振动的有效措施

在齿轮传动领域中，至今仍然普遍认为，只要主动齿轮的输入扭矩保持恒定，渐开线齿轮支座就不会产生振动。本文的研究充分表明，渐开线齿轮机的构运行时，它的支座不可避免地会发生一定程度的振动，作者对渐开线齿轮机构运行过程中支座实际反力变化规律作了系统的剖析及研究，并推导出渐开线齿轮支座实际反力计算式及支座实际反力波动率方程组。该齿轮支座实际反力波动率方程组所显示的严密的数学力学关系揭示了导致渐开线齿轮支座强迫振动的主要隐因素就是齿间滑动摩擦，深入的分析研究进一步表明，抑制齿轮支座强迫振动的重要措施是有效地降低齿间滑动摩擦系数、合理地调配齿数和传动化比以及严格地控制中心距增量系数。     

Interaction Between Autocorrelation and Conditional Heteroscedasticity: A Random-Coefficient Approach

In applied econometrics, we tend to tackle specification problems one at a time rather than considering them jointly. This has serious consequences for statistical inference. One example of this is considering autocorrelation and autoregressive conditional heteroscedasticity (ARCH) separately. In this article we consider a linear regression model with random coefficient autoregressive disturbances that provides a convenient framework to analyze autocorrelation and ARCH simultaneously. Our stationarity conditions and testing results reveal the strong interaction between ARCH and autocorrelation. An empirical example of testing the unbiasedness of experts' expectations of inflation demonstrates that neglecting conditional heteroscedasticity or misspecifying the autocorrelation structure might result in unreliable inference.     

基于二重趋势预测模型的安徽城市居民消费价格总指数预测分析

主要针对安徽城市居民消费价格指数的变化进行研究,重点分析了消费价格总指数的增加趋势和周期循环态势,预测未来几年安徽城市居民消费价格指数将在增加趋势和周期循环趋势的共同作用下出现的态势,分析其具体的原因并提出双向控制、承接大势、农村先行和稳定房价等建议。     

Decision Making and the Price Setting Newsvendor: Experimental Evidence

We present an experimental study of the price‐setting newsvendor problem, which extends the traditional framework by allowing the decision maker to determine both the selling price and the order quantity of a given item. We compare behavior under this model with two benchmark conditions where subjects have a single decision to make (price or quantity). We observe that subjects deviate from the theoretical benchmarks when they are tasked with a single decision. They also exhibit anchoring behavior, where their anchor is the expected demand when quantity is the decision variable and is the initial inventory level when price is the decision variable. When decision makers set quantity and price concurrently, we observe no significant difference between the normative (i.e., expected profit‐maximizing) prices and the decision makers’ price choices. Quantity decisions move further from the normative benchmarks (compared to when subjects have a single decision to make) when the ratio of cost to price is less than half. When this ratio is reversed, there is no significant difference between order levels in single‐ and multi‐task settings. In the multidecision framework, we also observe a tendency to match orders and expected demand levels, which subjects can control using prices.     

说唐代牡丹

唐高宗时 ,皇后武则天移植汾州牡丹于京师长安 ,牡丹作为观赏花卉 ,始为社会普遍认识。佛教僧人为培育牡丹做出了重大贡献。牡丹价格始终昂贵。唐代赏牡丹蔚然成风。牡丹与社会生活结成种种关系 ,还进入音乐、美术领域     

物价涨幅明显上升 总体态势趋向偏热 ——2007年中国经济运行回顾

 内容提要：2007年，我国经济快速增长，物价涨幅明显上升，金融运行状况不断攀升，外部失衡加剧，经济总体态势趋向偏热。     

CPI编制中的几个基本问题探析

 消费者价格指数（CPI）是宏观经济分析中的重要指标，准确地编制CPI有着非常重要的意义。本文探讨了CPI的测度目标、概念框架、消费范围、地理范围、基本价格指数等CPI编制中的基本问题，得出了若干富有启发性的结论。     

老年护理伦理学研究论纲

老年护理伦理学探讨老年护理伦理问题及其发展规律，它具有交叉性、价值性、实践性等特质。人口老龄化社会迫切需要老有所养、养有所护，尤其要给予老年人更多的伦理关怀。老年护理伦理包括：社区老年护理伦理、家庭老年护理伦理、隔代护理伦理、老年营养护理伦理、老年临床护理伦理、老年自我护理伦理、老年相互护理伦理、老年保健护理伦理、老年心理护理伦理等研究内容。     

近两年来价格上涨的特征、 原因及走势分析

 内容提要：2007年以来，我国市场价格呈现出快速上涨的态势，成为当前经济运行中的一个突出矛盾和问题。本文以大量翔实的数据，对近两年来价格上涨的主要特征进行了归纳和刻画，对上涨原因进行了全面系统客观的分析，特别指出了此轮价格上涨不同于以往的深刻背景。特别提出要正确处理好两个关系：防止通货膨胀与保持经济增长的关系，防止价格过快上涨与理顺价格体制的关系。     

价格波动的可控性

本文研究了如何提出合理的预期价格,保证供给和需求趋于均衡,从而实现价格波动的可控性。