Ecological patterns of fish distribution in the Slave River Delta region,Northwest Territories,Canada, as relayed by traditional knowledge and Western science

Indigenous community members along the Slave River in Canada have voiced their concerns for the health of ecosystems under pressure from resource extraction, hydroelectric development and global climate change. We present a test case of traditional knowledge and scientific results about the spawning and migration patterns of fish in the Slave River and Delta. This dual knowledge system approach elucidates the broader connectivity of local study regions and can improve monitoring programmes by extending beyond the usual context/confines of the present or recent past, increasing the spatial and temporal range of system information.     

Is a Policy of Free Movement of Workers Sustainable?

In this paper, we study the costs and benefits of the adoption of a policy of free movement of workers. For countries to agree on uncontrolled movements of workers, short‐run costs must be outweighed by the long‐term benefits of better labor‐market flexibility and income smoothing. We show that such a policy is less likely to be adopted when workers are more impatient and less risk‐averse, when production technologies display stronger decreasing returns, and when countries trade a significant share of their products.     

International aid from the recipient perspective: public or private good input assistance?

This article proposes a theoretical model from the recipient perspective that considers what type of assistance a donor country should provide: public good assistance or private good assistance. We investigate the effects of migration and free riders under both types of assistance. We empirically apply this model to the rapidly growing economies and a large official development assistance disbursement for East Asia.     

Optimal investment-consumption-insurance with random parameters

This paper discusses an optimal investment, consumption, and life insurance purchase problem for a wage earner in a complete market with Brownian information. Specifically, we assume that the parameters governing the market model and the wage earner, including the interest rate, appreciation rate, volatility, force of mortality, premium-insurance ratio, income and discount rate, are all random processes adapted to the Brownian motion filtration. Our modeling framework is very general, which allows these random parameters to be unbounded, non-Markovian functionals of the underlying Brownian motion. Suppose that the wage earner’s preference is described by a power utility. The wage earner’s problem is then to choose an optimal investment-consumption-insurance strategy so as to maximize the expected, discounted utilities from intertemporal consumption, legacy and terminal wealth over an uncertain lifetime horizon. We use a novel approach, which combines the Hamilton–Jacobi–Bellman equation and backward stochastic differential equation (BSDE) to solve this problem. In general, we give explicit expressions for the optimal investment-consumption-insurance strategy and the value function in terms of the solutions to two BSDEs. To illustrate our results, we provide closed-form solutions to the problem with stochastic income, stochastic mortality, and stochastic appreciation rate, respectively.     

强化质量意识 需从细节做起——从表面形貌特征评定参数的拓展谈起

工件的某些表面形貌特征会对产品的性能和质量产生重大的影响,因此,拓展表面形貌特征的评定参数,以提升产品的质量监控水平已成为必需。文章以工件的回转密封面为例,就螺线纹理这一表面微观结构的形貌特征及其可能引起的产品质量隐患做了详细的说明,并介绍了如何利用精密仪器实施相关的测量。文中透过对这一往往被业内忽略的细节的监控思路,阐明了在企业内,强化质量意识必须从重视每个细节做起的观点。     

A Link Between Workers' Remittances and Business Cycles in Germany and Turkey

This paper examines the cyclical interactions between the remittances of Turkish workers in Germany and output in both Turkey and Germany. Our analysis introduces a new data set covering 1962 to 2004, never used before in the research literature and considered to be a more reliable source than the data sets used in other studies. By dividing the original sample into recruitment, family reunification, and naturalization periods, we show that the duration of migrants' stay in the host country affects the direction and strength of the relation between remittances and the host and home countries' business cycles.     

大型矿井动力操控员工安全心理参数探究

随着矿产资源不断向地层深部开采,矿井亦不断延伸,尤其是千米深井日渐增多,矿井动力提升速度和提升功能不断加快、增强,矿井数字化水平提高,对矿井动力操控员工的心理反应能力、注意能力、时空判断能力等一系列心理素质水平的要求不断增强。员工的反应准确性、注意集中和分配能力及情绪稳定性和人格状况是构成影响员工操控行为安全稳定的核心心理品质。探究矿井动力提升系统操控员工的各项安全心理阈限值及其安全心理参数标准,建立员工安全心理选拔准入制,是保障矿井人一机和谐安全运行的重要措施。     

农村剩余劳动力迁移的充要条件分析——基于预期收入成本理论

笔者结合收益成本理论及托达罗模型,在对农民预期迁移收益和成本分析的基础上,通过调研数据,分别对就地和异地两种迁移方式以及迁移前后的收益进行对比分析。结论显示:第一,农村剩余劳动力就地迁移和异地迁移的最低期望月薪差值远远大于异地迁移成本;第二,农民对就地迁移和异地迁移的最低期望月收入分别是农民在农村剔除务工收入后人均月收入的3.42倍和4.80倍,这两个比例数值即是本文寻求的焦点——农村剩余劳动力迁移的充要条件,并且该比例数值可能会随着不同地区农村经济水平的提高而减小。     

一种在虚拟机中快速安装LFS的方法

LFS是从源代码开始编译的简洁的Linux系统。文章描述一种将物理机上的LFS快速安装及部署到虚拟机基础操作平台的方法。该方法快速灵活,特别适用于虚拟化平台中数据库集群以及均衡负载等对操作系统的一致性要求较高的系统。     

集成化物流资源整合的协同框架分析

本文以系统理论、协同理论为理论依据,采用粗糙集属性简约算法筛选出集成化物流资源系统的序参量——核心竞争力和协同度,在此基础上构建了集成化物流资源系统自组织模型。通过求解分析自组织模型,概念性地描述了集成化物流资源整合的协同过程,并揭示了集成化物流资源整合协同演化的本质,为指导集成化物流资源整合提供了理论依据。