流体粘度对涡轮流量计性能影响的理论预测

流体粘度是影响涡轮流量计性能的主要因素之一。本文运用粘性流体力学原理对现有涡轮流量计理论模型进行了改进。根据新模型计算的流量计特性曲线与变粘度实验结果更为吻合,从而为解决工业生产中涡轮流量计测量结果的粘度修正问题提供了实用的方法。利用本文的研究结果还可预测仪表几何参数和来流速度分布等因素对涡轮流量计性能的影响,作为改进仪表设计的理论依据。     

A joint examination of effects of decision task type and construal level on the attraction effect

The attraction effect refers to a situation in which adding an inferior alternative to a choice set increases the share of the relatively dominating alternative. This research posits that decision task type affect the attraction effect. People usually seek justification for their decisions. In a selection (or rejection) task, they are more likely to emphasize the positive (or negative) features of each option. The addition of an asymmetrically dominated decoy to a binary set of options undoubtedly provides an extra positive feature for the dominant option, and therefore induces a greater attraction effect. Contrarily, in a rejection task condition, the decoy in the trinary set seems to be the worst option and would be eliminated first, and the remaining comparison is identical with the original binary condition. Therefore, the attraction effect may decrease. Besides, the decision task type interacts with the construal level to affect the attraction effect. Specifically, a low construal level, compared with a high construal level, dampens the attraction effect to a greater extent in a rejection task than in a selection task. Results from three experiments support the proposed hypotheses.     

居民信息消费的区域差异及与经济增长关系

为了研究居民信息消费的区域差异,从消费规模、消费水平、消费结构等方面对我国东、中、西部的居民信息消费进行了比较分析。对区域居民信息消费与区域经济增长之间的关系进行研究,使用省际面板数据建立静态和动态面板模型,并分别采用固定效应模型估计方法和一阶差分GMM方法进行估计。结果表明,我国居民信息消费水平与经济增长之间的关系存在着明显的区域差异,这种互动作用在东部和西部为正并且显著,但在中部地区却不显著。最后,依据此结论对推动区域信息消费提出了相应的政策建议。     

A Comparison of the Performance of Phase II Simple Linear Profile Control Charts when Parameters are Estimated

The standard deviation of the average run length (SDARL) is an important performance metric in studying the performance of control charts with estimated in-control parameters. Only a few studies in the literature, however, have considered this measure when evaluating control chart performance. The current study aims at comparing the in-control performance of three phase II simple linear profile monitoring approaches; namely, those of Kang and Albin (2000), Kim et al. (2003), and Mahmoud et al. (2010). The comparison is performed under the assumption of estimated parameters using the SDARL metric. In general, the simulation results of the current study show that the method of Kim et al. (2003) has better overall statistical performance than the competing methods in terms of SDARL values. Some of the recommended approaches based solely on the usual average run length properties can have poor SDARL performance.     

空间数据分析方法在经济增长研究中的应用述评

近年来空间数据分析方法在经济增长经验研究中越来越受到重视。本文通过梳理和介绍国内外这方面有代表性的研究,一方面概要介绍空间数据分析方法,另一方面展示了这种方法在增长研究中的应用价值和应用前景。     

肯尼迪总统就职演说辞修辞探析

肯尼迪就职演说辞在行文过程中大量运用修辞手法,使文章收到了很好的表达效果。这些修辞技巧有头韵、含蓄陈述、平行结构、重复、回环、层进法、同源修辞格、矛盾修饰法、移就格等。     

中国社会保障模式选择的民意基础——基于重庆市城乡居民福利态度的实证调查

究竟是哪些因素影响中国城乡居民对社会保障模式的选择？这些因素到底对中国社会保障模式选择影响有多大？对于这些问题,至今我们的了解仍显不足。对重庆市城乡居民福利态度的实证研究结果显示：城乡居民呈现出较为明显社会公平取向的特征。经济发展水平、人口结构特征、制度效果等因素对城乡居民均有显著影响。制度效果、恩格尔系数和文化程度、性别等因素对城乡居民社会保障模式取向的影响存在差异性。     

When can fiscal consolidation be expansionary? Evidence from a small open economy

The paper focuses on the implications of stabilisation policies in a small open economy that were introduced to reverse burgeoning public sector deficit. In particular, I examine the hypothesis that such stabilisation policies can actually have expansionary effects on business investment. While this goes against the standard Keynesian view that the institution of more conservative fiscal and monetary programmes will, at least initially, lead to deflationary outcomes, there are important reasons for believing that such policies will in fact be expansionary. Such predictions are made in a dynamic setting, which weighs the short-term consequences of curtailed government expenditures against their long run implications for future increases in government spending, a reduction in debt burdens and greater stability. With the introduction of expectations, the positive implications of such policies can be immediate. This paper tries to clarify the ‘expectational crowding-in’ process and investigates whether the effects of stabilisation on business investment were due to that process or to other features of the stabilisation programmes. The policy message from my analysis is that budget consolidations producing expansionary effects are more than a theoretical construction. The experience of small open economies mentioned above should be taken into account also in policy making. Empirical findings indicate that EMU countries may need to carry out budgetary consolidations to dispose of room for manoeuvre against first the fiscal constraints in smoothing the business cycle imposed by the Stability Pact, and second, the looming budgetary implications of ageing populations.     

场:组织行为理论的一个新视角

以物理学场理论的基本概念和思维方法 ,讨论组织行为具有场的形态、性质 ,是一种尝试。组织行为场是复合场 ,由各类子场生成、耦合 ,其总体特征是共时性、非均匀性和协同性     

全球经济及其理论辨析

由关贸总协定、世界贸易组织、世界银行、欧共体、美洲自由贸易区等国际协定和跨国公司体现的世界经济一体化是由私有化进程和打破区域垄断的自由主义经济目标推动的不可逆转的趋势。在这一过程之中经济和经济学成了世界的结构信息。经济学的两个预设———自私自利的经济人和人的世界———非人世界的二元论是全球经济的深层理论基石。经济人的实践活动造成贫富不均 ,二元论把人溺爱成肆无忌惮地破坏环境的动物。人类应该冷静思索这一新的世界形势 ,提出合理对策