首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   432篇
  免费   9篇
管理学   81篇
民族学   1篇
人口学   38篇
理论方法论   39篇
综合类   3篇
社会学   240篇
统计学   39篇
  2022年   2篇
  2020年   4篇
  2019年   6篇
  2018年   12篇
  2017年   10篇
  2016年   9篇
  2015年   4篇
  2014年   6篇
  2013年   101篇
  2012年   21篇
  2011年   8篇
  2010年   2篇
  2009年   8篇
  2008年   5篇
  2007年   11篇
  2006年   10篇
  2005年   7篇
  2004年   8篇
  2003年   6篇
  2002年   6篇
  2001年   6篇
  2000年   6篇
  1999年   4篇
  1998年   6篇
  1997年   7篇
  1996年   8篇
  1995年   8篇
  1994年   11篇
  1993年   10篇
  1992年   7篇
  1991年   9篇
  1990年   12篇
  1989年   3篇
  1988年   6篇
  1987年   9篇
  1986年   5篇
  1985年   4篇
  1984年   8篇
  1983年   7篇
  1982年   5篇
  1981年   8篇
  1980年   7篇
  1979年   4篇
  1978年   2篇
  1977年   6篇
  1976年   7篇
  1975年   5篇
  1974年   3篇
  1973年   3篇
  1972年   2篇
排序方式: 共有441条查询结果,搜索用时 390 毫秒
11.
Shadow Insurance     
Life insurers use reinsurance to move liabilities from regulated and rated companies that sell policies to shadow reinsurers, which are less regulated and unrated off‐balance‐sheet entities within the same insurance group. U.S. life insurance and annuity liabilities ceded to shadow reinsurers grew from $11 billion in 2002 to $364 billion in 2012. Life insurers using shadow insurance, which capture half of the market share, ceded 25 cents of every dollar insured to shadow reinsurers in 2012, up from 2 cents in 2002. By relaxing capital requirements, shadow insurance could reduce the marginal cost of issuing policies and thereby improve retail market efficiency. However, shadow insurance could also reduce risk‐based capital and increase expected loss for the industry. We model and quantify these effects based on publicly available data and plausible assumptions.  相似文献   
12.

There have been few studies investigating the relationship between the built environment and the status of bird distributions in small island tropical urban areas. We present a study investigating the relationship between bird species richness, abundance and assemblage to the built environment in Suva, Fiji. Field surveys were taken at 54 randomly selected sites throughout the city, stratified by three building density classes and the central business district (CBD). At each site bird counts were recorded, along with environmental data such as average building height, within a 150 m radius. Land-use information was obtained from screen digitized high-resolution satellite imagery within the same radius. Distance to undeveloped patches of land within the urban area was calculated using a GIS. Analysis of the effects of the built environment was carried out for all species, and for exotic and native species separately. Abundance of exotics was significantly higher in the central business district (CBD) than all other urban density classes, and significantly higher than natives in all other density classes. We found a negative relationship between native species richness and distance to undeveloped patches, but no relationship for exotics. Species assemblage was not related to urban density class. We conclude that the status of native and exotic bird species in Suva is similar to what has been found in urban areas in temperate climates, and conservation efforts should focus on minimizing the amount of heavily urbanized “core areas” and protecting undeveloped areas of forested vegetation to improve bird biodiversity in small tropical islands cities.

  相似文献   
13.
14.
This paper explores the potential of observational sketching as a social science research tool, informed by our own recent experiments with observational sketching techniques and approaches. We first outline the historical roots of academic sketching and note a recent resurgence of interest in sketching in certain disciplines. We then introduce our own explorations in sketching as method, based on a year-long collaboration between an observational artist and a group of qualitative researchers with interests in creative methods. The paper outlines some of the lessons we learnt from our partnership, focusing on three themes: (i) ‘sketchiness’; (ii) ‘concentrated seeing’ and (iii) sketching as interaction. We conclude that observational sketching generates a refreshingly different form of visual data which has considerable potential to be used as a complement to other methods, including as a participatory method and as a useful tool for thinking.  相似文献   
15.
16.
Wu  Shiyou  Chapman  Mimi V.  Zhu  Meihua  Wang  Xiafei 《Social indicators research》2020,149(2):571-584

As China’s economy is rapidly changing from a planned to a capitalist economy, many families find themselves financially struggling. In some cases, conflicting values and attitudes may contribute to mental health challenges such as depression that would lead to further feelings of helplessness and immobilization. Using a random sample of 1006 low-income households from Pudong District of Shanghai, China, this study aims to examine the relationships between household assets, beliefs about government as the primary way to improve economic circumstances and self-reported depressive symptoms. In addition, this study investigates the mediation effects of beliefs that government is the best change agent for improved life circumstances on the relationship between household assets and depression. We found those who indicated that government was the main means for attaining a better life had significantly higher depression levels whereas higher numbers of household assets were associated with lower depression levels. We also found that viewing government as the most important change agent only partially mediated the relationship between household assets and depression (p?<?.001). Findings from this study support anti-poverty policies and social work related practice initiatives aimed at assisting low income families in China, in particular the need to address psychological as well as economic needs.

  相似文献   
17.
18.
In the 1990ies the German Federal Institute for Occupational Safety and Health (FIOSH) published "Key Indicator Methods" (KIM) for the evaluation of manual material handling tasks. These methods served as a national German implementation of the EU Manual Handling Directive (90/269/EEC). These methods allow the evaluation of individual handling tasks like lifting or pushing. KIM tools do not allow evaluating complex handling tasks like a combined lifting and pushing task. With respect to the needs at shop floor level (e.g. logistics), MultipLa tries to bridge that gap by means of an EXCEL based worksheet using the KIM philosophy. In the past several algorithms for a risk assessment had been developed. At the moment MultipLa is in a test phase at several automotive OEMs.  相似文献   
19.
To predict the technology acceptance of a system before market release is one of the big challenges of today. Many models are concerned with the question if someone is going to accept the system or not. Within this work a first empirical investigation of a personal trait called Pleasure of Control (PoC) is presented. Pleasure of Control is a construct that divides people into those people enjoy having control over a technical system and those who do not. It is predicted that a high Pleasure of Control leads to a prolonged system usage and unwillingness to accept highly automated systems. This paper presents a first empirical investigation of Pleasure of Control with 10 Persons with focus on usage durations. An experimental study revealed differences in the usage durations of a technical system (Apple iPad) between users with high and user with low Pleasure of Control measures.  相似文献   
20.
In the future the air traffic will rise--the workload of the controllers will do the same. In the BMWi research project, one of the tasks is, how to ensure safe air traffic, and a reasonable workload for the air traffic controllers. In this project it was the goal to find ways how to reduce the workload (and stress) for the controllers to allow safe air traffic, esp. at huge hub-airports by implementing augmented reality visualization and interaction.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号