浅谈煤矿热交换站循环泵的选型

热交换站中的循环泵是整个采暖系统的核心设备,动力之源,重要性如同一个人的心脏,它的选型正确与否,直接关乎整个采暖系统的运转。本文对作者接触到的几个新建、改建的煤矿热交换站在循环泵选型上存在的误区进行分析,指出解决问题的对策。     

等概率条件下的转弯型堆垛机作业效率的计算研究

转弯型堆垛机是自动化立体仓库中实现货物自动存取的关键设备,文中对转弯型堆垛机效率问题进行研究。在假定等概率拣取货物的条件下,分别推求转弯型堆垛机的平均单一作业和复合作业循环周期和作业效率的计算公式,并利用华南理工大学仓储综合实验室的基本数据进行了作业效率的实证计算,从而为自动化立体仓库系统的建设设计和有效管理提供依据。     

基于EGARCH模型的我国向美国出口变动杠杆效应分析

本文运用EGARCH计量模型,对我国向美国出口增速变动进行杠杆效应分析。模型结果显示,出口增速在负向冲击下比受到正向冲击时的波动更加剧烈。次贷危机的恶化,也将会对我国向美国出口增速产生较大的负面影响,从而影响我国的整体出口。对此,文章给出了相关建议。     

Asset price targeting in an open economy with cognitive limitations: The best for macroeconomic and financial stability?

The choices of policy targets and the formation of agent expectations have been critical issues addressed by monetary policy management since the financial crisis of 2008. This paper evaluates macroeconomic stability in a new Keynesian open economy in which agents experience both cognitive limitations and asset market volatility. The (im)perfect credibility of various monetary policies (e.g., a Taylor-type rule with- or without asset price targeting, strict domestic inflation targeting, strict CPI inflation targeting, and exchange rate peg) may lead agents to react according to their expectation rules, and thus create various degrees of booms and busts in output and inflation. Simulations confirm that a Taylor-type CPI inflation targeting including an asset price target is the best choice. In contrast, the business cycles induced by Keynesian “animal spirits” are enhanced by strict inflation targeting. Furthermore, a credible exchange rate pegging system with an international reserve pooling arrangement can improve social welfare and stability in an open economy, even though its absolute value of the loss function is slightly lower than a Taylor-type CPI inflation targeting including an asset price target.     

The expected real yield and inflation components of the nominal yield curve

The term structure of real yields and expected inflation are two unobserved components of the nominal yield curve. The primary objectives of this study are to decompose nominal yields into their expected real yield and inflation components and to examine their behaviour using state-space and regime-switching frameworks. The dynamic yield-curve models capture three well-known latent factors – level, slope, and curvature – that accurately aggregate the information for the nominal yields and the expected real and inflation components for all maturities. The nominal yield curve is found to increase slightly with a slope of about 120 basis points, while the real yield curve slopes upward by about 20 basis points, and the expected inflation curve is virtually flat at slightly above 2 per cent. The regime-switching estimations reveal that the nominal yield, real yield and expected inflation curves have shifted down significantly since 1999.     

试论"入世后过渡期"出口企业应对新贸易壁垒的措施

根据我国加入WTO协定，我国将逐步履行承诺，到2006年底执行完全入世承诺。“入世后过渡期”对我国企业的影响深远。在传统贸易壁垒作用日益减弱的今天，技术壁垒、绿色壁垒、社会壁垒等新贸易壁垒已成为我国外贸发展的主要障碍。为了减少以至于消除新贸易壁垒的不利影响，我国出口企业必须尽快与国际通行的环境管理制度相衔接。而大力提高国民的环保意识，积极申请绿色认证，推行绿色管理，建立和完善绿色政策和法规正是我国出口企业突破新贸易壁垒的有效手段，以确保我国对外贸易的可持续发展。     

混合所有制改革能有效化解国有企业产能过剩吗

在深化国有企业混合所有制改革的政策背景下,相比于采用正向逻辑来研究国有企业与其他所有制企业产能过剩的成因与化解机制异同,本文通过逆向逻辑构造反事实因果推断,即国有企业经过混合所有制改革身份属性发生变更后产能过剩能否得到化解,来探究国有企业产能过剩的制度性成因。在实证分析中,本文通过PSM—多期DID方法识别了国有企业混合所有制改革对于其产能利用率的政策影响,分析了不同市场结构下国有企业规模对产能利用率影响的非线性关系,明晰了国有企业混合所有制改革化解产能过剩的作用途径,探究了产能过剩的制度性根源与衍生因素之间的传递效应。     

外部研发合作广度与新产品开发绩效：一个有调节的中介模型

基于企业外部合作伙伴分布广泛的特点,从外部研发合作广度的两个维度（市场广度和研究广度）出发,选取2010—2018年160家中国制造业上市企业数据,运用多元回归分析法探讨外部研发合作广度对企业新产品开发绩效的影响。结果表明,外部研发合作的市场广度和研究广度正向影响新产品开发绩效,其中,研究广度的作用更为显著;网络学习在外部研发合作广度对新产品开发绩效的影响机制中存在部分中介作用;知识库同质性正向调节外部研发合作广度与网络学习的关系。结论丰富了新产品开发绩效前因变量研究,对企业制定外部研发合作战略,提升新产品开发绩效具有重要管理启示。     

Thought experimentation and the Phillips curve

This paper offers the rationale for presenting a particular type of Phillips curve and develops the dynamic behavior of an economy where such a Phillips curve relation is observed. The specific kind of relation that is explored has similarities with the sticky-information Phillips curve of the Mankiw-Reis framework. Nevertheless, it adds an important dimension: firms need to form expectations about current events on past time periods not because of infrequent optimal updating of information but because producers want to evaluate the possibility of taking advantage of information deficiencies on the consumers’ side. A positive probability of ‘fooling’ consumers with a price above the one imposed by market conditions re-shapes the dynamic relation between the inflation rate and the output gap.