碟式分离机支撑条件对转子系统动力学特性影响

为保证蝶式分离机转子系统的稳定性,笔者基于有限元分析软件ANSYS分析转鼓内离心载荷、支承位置与支承刚度对碟式分离机动力学特性的影响,研究固有特性、模态频率和相应振型的变化规律。结果表明：转鼓内流体离心载荷对转子刚度产生显著影响,进而导致各阶模态变化趋势各异;支撑位置和支撑刚度对转子不同阶模态的影响趋势与相应振型有关,当转子部件变形不一致时,部分阶数模态频率可能随支撑位置上移而减小;转子振型在支承位置的径向振幅明显时,支撑刚度对模态频率产生显著影响。研究结果可用于碟式分离机转子系统的设计与优化。     

公寓大厦之停车场车位问题

无论是从学理上还是从法规政策上的考量,笔者都认为应当摒弃传统观念,对建筑物构造和利用上的独立性进行符合经济效用的宽泛解释.对停车场的法律地位应作类型化的区别:(1)如果开发商已经将建设停车场的费用计入商品房销售价格,开发商应当在商品房销售合同中明示,以明确区分所有权人对此停车场的共同共有权.(2)如果开发费用没有摊销,自行车库、无人看管的露天汽车停车场以及一定的地下或室内汽车停车场应该属于区分所有权人共用共有部分.(3)在有共有部分性质的停车场上,可以设立共有部分专用权.(4)除此以外的地下或者室内停车场,由于其由构造和功能上的独立性,可以作为区分所有权的客体,由开发商在楼盘出售之时享有并处分.     

Competing demands,competing solutions,differing constructions of the problem of recruitment and retention of frontline rural child protection staff

Abstract

This article reports on a study conducted in rural Victoria. It examines the problem of recruitment and retention of frontline staff in the Victorian Child Protection program. The article delineates those factors identified by managers and supervisors as influencing workers to enter, stay and leave the program. Managers and supervisors have collective responsibility for recruiting and retaining staff. It is for this reason that their viewpoints are considered crucial in responding to the problem. What this study found was that, while managers and supervisors recognise that the problem is complex, they differ in the emphasis placed on facets of the problem, thus their approaches to solving it. As solutions are contested the problem is exacerbated. The argument advanced is that any response should recognise the complexity of the problem and solutions be considered in a coordinated way.     

A Monte Carlo Investigation of Unit Root Tests and Long Memory in Detecting Mean Reversion in I(0) Regime Switching,Structural Break,and Nonlinear Data

The potential observational equivalence between various types of nonlinearity and long memory has been recognized by the econometrics community since at least the contribution of Diebold and Inoue (2001 Diebold, F., Inoue, A. (2001). Long memory and regime switching. Journal of Econometrics 105:131–159.[Crossref], [Web of Science ®] , [Google Scholar]). A large literature has developed in an attempt to ascertain whether or not the long memory finding in many economic series is spurious. Yet to date, no study has analyzed the consequences of using long memory methods to test for unit roots when the “truth” derives from regime switching, structural breaks, or other types of mean reverting nonlinearity. In this article, I conduct a comprehensive Monte Carlo analysis to investigate the consequences of using tests designed to have power against fractional integration when the actual data generating process is unknown. I additionally consider the use of tests designed to have power against breaks and threshold nonlinearity. The findings are compelling and demonstrate that the use of long memory as an approximation to nonlinearity yields tests with relatively high power. In contrast, misspecification has severe consequences for tests designed to have power against threshold nonlinearity, and especially for tests designed to have power against breaks.     

双重二元分割:单位制变革中的城市劳动力市场

劳动力市场分割是世界各国的普遍现象,是对于劳动力市场非完全竞争的另一种表述。我国城市劳动力市场是在“单位制”变革的背景下形成的,在宏观上表现为体制内劳动力市场与体制外劳动力市场的二元分割。其中体制内劳动力市场与体制外劳动力市场又分别存在着二元分割,因此呈现出双重二元分割的状态。劳动力市场的双重二元分割在现实当中表现为我国劳动力市场中独特的就业模式和收入分配模式。这种劳动力市场的分割状态会随着“单位制”持续变革发生动态的调整和演变,其目标取向是规范统一的劳动力市场。     

村民自治有效实现单元的讨论与研究

近年来,我国村民自治活动的开展遇到了“自治悬空”甚至是“村民自治无自治”的发展困境.导致这一问题的一个重要原因在于,村民自治的基本单元——行政村与传统自治单元——自然村基础的脱节.面对上述困境,全国各地相继开展了一系列建立在自然村基础上的、重构村民自治单元的探索和实践.这些地方性改革与实践说明,村民自治制度作为国家行政管理与社群自治的统一,需要建立在相应的乡村自治的社会基础之上.而村民自治本身的发展或已进入探寻自治内在动力的第三阶段,其发展的理想标的应是自治功能与行政功能兼顾的模式,其有效实现单元可能是在现有行政村基础上的、同时向自然村拓展的多级自治形式.     

Enhancing Recovery from Trauma: Facilitating a Mindfulness Skills Group on a Department of Veterans Affairs Inpatient PTSD Unit

Mindfulness and acceptance based treatments are being increasingly implemented for a variety of emotional and psychological related problems, including the impact of military and combat related trauma exposure. This article describes a mindfulness skills group as it was implemented on a sub-acute inpatient PTSD Unit at a Department of Veterans Affairs medical center, to demonstrate and explore the role of the mindfulness skills development in a group setting, for Post-Traumatic Stress Disorder and other trauma related problems.     

On minimum <Emphasis Type="Italic">m</Emphasis>-connected <Emphasis Type="Italic">k</Emphasis>-dominating set problem in unit disc graphs

Minimum m-connected k-dominating set problem is as follows: Given a graph G=(V,E) and two natural numbers m and k, find a subset S⊆V of minimal size such that every vertex in V∖S is adjacent to at least k vertices in S and the induced graph of S is m-connected. In this paper we study this problem with unit disc graphs and small m, which is motivated by the design of fault-tolerant virtual backbone for wireless sensor networks. We propose two approximation algorithms with constant performance ratios for m≤2. We also discuss how to design approximation algorithms for the problem with arbitrarily large m. This work was supported in part by the Research Grants Council of Hong Kong under Grant No. CityU 1165/04E, the National Natural Science Foundation of China under Grant No. 70221001, 10531070 and 10771209.     

Cointegration and Long-Horizon Forecasting

We consider the forecasting of cointegrated variables, and we show that at long horizons nothing is lost by ignoring cointegration when forecasts are evaluated using standard multivariate forecast accuracy measures. In fact, simple univariate Box–Jenkins forecasts are just as accurate. Our results highlight a potentially important deficiency of standard forecast accuracy measures—they fail to value the maintenance of cointegrating relationships among variables—and we suggest alternatives that explicitly do so.     

数据初始值对DF类IPS检验势的影响研究

 本文研究了DF类面板数据单位根IPS检验势受时序数据初始值的影响,推导了DF类面板单位根IPS检验统计量在局部备择假设下的极限分布和局部渐近势函数,发现了DF类面板数据单位根IPS检验统计量局部渐近势在异质性局部备择假设下是初始条件的单调递增函数;小样本Monte Carlo模拟分析结果表明,若假设初始条件为零,DF类IPS统计量的检验势将被低估。