高阶非线性时滞差分系统渐近常数解的存在性

利用Schauder-Tychonoff不动点定理,研究了一类高阶时滞差分系统,获得了一组渐近常数解存在的充分性条件.     

浅析农村土地流转对劳动力市场的要求

农村土地流转必然会造成剩余农村劳动力向非农领域转移,现有的城乡分割的劳动力市场却无法促进转移,因而建立一个统一、开放、竞争有序的城乡一体化的劳动力市场就成为一种基本诉求。构建城乡一体化的劳动力市场,要抓好城乡二元户籍制度、义务教育与农民后续教育制度、劳动力市场制度的改革,规范劳动力让渡的中介环节。     

板模型具积分边界条件的临界解的离散纵标逼近

研究一类非均匀介质 ,具积分边界条件的板几何迁移系统临界解的离散纵标逼近 .以泛函分析为工具 ,应用Ba nach空间上的总体列紧算子理论 ,证明了近似计算临界板厚度及其相应的非负本征函数的离散纵标方法的收敛性 .     

Politics and performance: the implications of emerging governance arrangements for urban management approaches and information systems

Challenges to traditional public sector approaches to urban government have had an impact on various aspects of governance and management, including political arrangements, decision making processes, ways of ensuring accountability, the allocation of roles and responsibilities between public sector agencies and other potential service providers and between different levels of government, and the mobilisation and allocation of financial resources for urban development. These are discussed, drawing in particular on recent research on urban poverty and governance in ten cities in the South. The changing approaches to urban government and management have been accompanied by attempts to define criteria by which urban governance arrangements and performance can be assessed, which are summarised and critically evaluated. Finally, the potential value of a particular set of tools (GIS) for emerging approaches to urban governance is assessed. Their potential for improving the information available to all governance actors is recognised. However, because of their cost and technological and managerial demands, as well as the limited effectiveness of spatial planning and inequalities in access to information, plans for their use must be financially, institutionally and politically realistic.     

What's Driving Brazil‐Japan Migration? The Making and Remaking of the Brazilian Niche in Japan

Abstract: Since the late 1980s the Brazilian population in Japan has steadily increased, despite the long‐term recession in the late 1990s. In this paper we will examine the mechanism of the constant increase of Brazilians in Japan, focusing on the institutional context of their incorporation into the Japanese labor market. On the demand side, Brazilians solved an acute labor shortage in the economic boom period, but long‐term recession and casualization of the labor market made them compete with other peripheral workers such as Japanese women and the aged. Thus Brazilians have been marginalized within the secondary labor market since the late 1990s. On the supply side, recruiting agencies and labor contractors established a “just‐in‐time” labor delivery system, which enabled “flexible staffing” in a highly fluctuating labor market. As a result, demand and supply for Brazilian workers is still on the increase. Working in Japan is getting less attractive for Japanese Brazilians but is more of a viable option for them, driving further migration from Brazil to Japan.     

空气压缩机节能技术的研究

论述了气动系统中空气压缩机变速运行的技术。导出了管网工作压力及工作流量与电机转速之间的控制数学模型。利用电机无功功率信号控制调频调压逆变器供电的感应电机的磁通,使其保持恒定、則气路系统在宽流量变化范围內能实现压力自动调节及电机节能。     

制度与农业发展

制度与经济发展有着内在的联系,是经济发展的重要变量.中国农业发展的曲折历程,实质上是中国农业制度选择的曲折.制度对农业发展有着决定性的影响作用,以制度建设为中心就成为解决中国三农问题的必然选择.     

具有投资滞后动态投入产出模型及其最优控制

将现代控制理论方法与投入产出分析相结合,研究了在宏观经济中带有普遍性的投资滞后及供需不平衡问题。导出了相应的动态模型及其最优控制的递推解。     

TIGHT UPPER CONFIDENCE LIMITS FROM DISCRETE DATA

Consider the problem of finding an upper 1 –α confidence limit for a scalar parameter of interest ø in the presence of a nuisance parameter vector θ when the data are discrete. Approximate upper limits T may be found by approximating the relevant unknown finite sample distribution by its limiting distribution. Such approximate upper limits typically have coverage probabilities below, sometimes far below, 1 –α for certain values of (θ, ø). This paper remedies that defect by shifting the possible values t of T so that they are as small as possible subject both to the minimum coverage probability being greater than or equal to 1 –α, and to the shifted values being in the same order as the unshifted ts. The resulting upper limits are called ‘tight’. Under very weak and easily checked regularity conditions, a formula is developed for the tight upper limits.     

Analyzing BSE Transmission to Quantify Regional Risk

As a result of consumer fears and political concerns related to BSE as a risk to human health, a need has arisen recently for more sensitive methods to detect BSE and more accurate methods to determine BSE incidence. As a part of the development of such methods, it is important to be able to identify groups of animals with above-average BSE risk. One of the well-known risk factors for BSE is age, as very young animals do not develop the disease, and very old animals are less likely to develop the disease. Here, we analyze which factors have a strong influence on the age distribution of BSE in a population. Building on that, we develop a simple set of calculation rules for classifying the BSE risk in a given cattle population. Required inputs are data on imports and on the BSE control measures in place over the last 10 or 20 years.