Seasonality and vertical structure of light-attracted insect communities in a dipterocarp forest in Sarawak

Nocturnal flying insects were collected monthly for 13 months using ultra violet light-traps set at various vertical levels in a weakly-seasonal, tropical lowland dipterocarp forest in Sarawak, Malaysia. Abundance, faunal composition, size distribution and guild structure of these samples were analyzed with respect to temperal and vertical distributions. The nocturnal flying insect community in the canopy level was highly dominated by fig wasps (84%) in individual number, and by scarabaeid beetles (28%) in weight. A principal component analysis on monthly catches detected non-random, seasonal trends of insect abundance. The first two principal trends were an alternation of wetter (September to January) and less wet seasons (February to August) and an alternation between the least wet (January to March) and the other seasons. Many insect groups were less abundant in the least wet season than the other seasons, whilst inverse patterns were found in Scarabaeidae and Tenebrionidae. Significantly positive and negative correlations between monthly catch and rainfall were detected only in ovule-feeders and in phloem-feeders, respectively. Delayed, significant negative correlations between monthly catch and 1–3 month preceding rainfall were more frequently detected in phytophages, phloem-feeders, seed-feeders, wood-borers and scavengers. The peak in abundance along vertical levels were found at the canopy level (35 m) for phloem-, ovule-, seed-, root-, fungal-feeders and nectar collectors, at an upper subcanopy level (25 m) for scavengers and aquatic predators, and at a middle subcanopy level (17 m) for ants. Catches at the emergent level (45 m) did not exceed those at the canopy level.     

FEDERAL TRANSFER PAYMENTS IN AMERICA: VETERANS' PENSIONS AND THE RISE OF SOCIAL SECURITY

This paper examines the determinants of the adoption of the veterans' pension program and how it served as a prototype for the creation and administration of the federal welfare system in the United States. We provide statistical evidence in the form of an analysis of votes in the House of Representatives that state-based special interests which had supported the ongoing liberalization of the veterans' pension program provided significant support for the adoption of the Social Security Act of 1935. There is clear evidence the social security system was not adopted as a simple extension of state old-age pension programs.     

Robust estimation for linear regression with asymmetric errors

The authors propose a new class of robust estimators for the parameters of a regression model in which the distribution of the error terms belongs to a class of exponential families including the log‐gamma distribution. These estimates, which are a natural extension of the MM‐estimates for ordinary regression, may combine simultaneously high asymptotic efficiency and a high breakdown point. The authors prove the consistency and derive the asymptotic normal distribution of these estimates. A Monte Carlo study allows them to assess the efficiency and robustness of these estimates for finite samples.     

关于党与人大在国家中地位的理性分析

党政关系是政治体制改革的中心环节,党政关系之所以难分难解的根本原因之一就在于党部分地承担起本应由人大来履行的职责,所以说党政关系最重要的就是党与人大的关系。只有正确处理党与人大的关系才能从根本上克服“党政不分”的弊端。然而,正确处理党与人大的关系却是一个复杂且难度很大的问题。对党与人大在国家中地位的分析可以帮助我们更好地处理两者的关系。     

Why Risk Analysis is Difficult,and Some Thoughts on How to Proceed

Risk analysis is challenged in three ways by uncertainty. Our understanding of the world and its uncertainties is evolving; indeterminism is an inherent part of the open universe in which we live; and learning from experience involves untestable assumptions. We discuss several concepts of robustness as tools for responding to these epistemological challenges. The use of models is justified, even though they are known to err. A concept of robustness is illustrated in choosing between a conventional technology and an innovative, promising, but more uncertain technology. We explain that nonprobabilistic robust decisions are sometimes good probabilistic bets. Info‐gap and worst‐case concepts of robustness are compared. Finally, we examine the exploitation of favorable but uncertain opportunities and its relation to robust decision making.     

几种电路分析方法适用范围的讨论

通过实例讨论了支路电流法、网孔分析法、节点电压法、叠加原理和戴维南定理的适用性 ,最后对电路分析时不同电路如何选用合适方法给出了一个参考性选择     

Peers,proactivity, and problem-solving: A multilevel study of team impacts on stress appraisals of problem-solving demands

ABSTRACT

To date, there is a paucity of research on team-level impacts on the individual stress appraisal process despite the recognised role of teams for solving problems. Applying a multilevel approach, this study investigates the cross-level impact of team problem prevention behaviours on employee stress appraisals of problem-solving demands. It was hypothesised that team problem prevention would moderate the individual-level relationship between problem-solving demands and stress appraisals. Data were collected from 43 work teams comprised of 192 team members including all team leaders who also provided evaluations of their team’s problem prevention behaviour. Results supported the hypothesised cross-level moderating effects on challenge appraisal, but not threat appraisal. As one of the first studies to demonstrate that stress appraisals are impacted by the group, not just by individual factors, the results support a multilevel conceptualisation of stress appraisals. The findings also highlight implications for practice, broadening the scope of possibilities for stress management interventions to utilise team-level strategies such as leadership development programmes and/or team building initiatives.     

Rota-Risk-Profile-Analysis

Abstract

In this article an update of the Rota-Risk-Profile-Analysis (RRPA) is presented. This RRPA is based on 9 rota-risk criteria that are central to a more encompassing rota theory. The RRPA allows coherent assessment of the physical and social risks of a working-time schedule (rota). comparison of schedules with one another in quantitative terms and interpretations of possible differential effects more adequately. First, a closer look at the instrument-a computer program-is taken. Afterwards the criteria and their way of implementation are discussed briefly. To get an impression of the way that RRPA functions an example will be given by applying the instrument to the working rotas from a study on shiftwork in the Netherlands.     

我国城镇居民个人教育需求分析——北京市调查报告

通过对北京市城镇个人教育需求的问卷调查发现 :城镇居民对高等教育的需求较为强烈 ;在教育方式的选择上呈现出多元化和多样性的趋势 ;教育投资在人们心中的权重也日渐提高 ,城市居民对教育消费也具备了一定的承受能力。个人教育需求的特点 ,有利于城镇教育产业化的推行。