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   821篇
  免费   35篇
  856篇
  2024年   5篇
  2023年   12篇
  2021年   7篇
  2020年   21篇
  2019年   43篇
  2018年   41篇
  2017年   61篇
  2016年   52篇
  2015年   27篇
  2014年   39篇
  2013年   208篇
  2012年   25篇
  2011年   24篇
  2010年   32篇
  2009年   17篇
  2008年   20篇
  2007年   24篇
  2006年   11篇
  2005年   8篇
  2004年   11篇
  2003年   12篇
  2002年   16篇
  2001年   6篇
  1999年   11篇
  1998年   6篇
  1997年   9篇
  1996年   4篇
  1995年   10篇
  1994年   6篇
  1992年   6篇
  1991年   2篇
  1990年   4篇
  1989年   2篇
  1988年   7篇
  1987年   3篇
  1986年   3篇
  1985年   8篇
  1984年   3篇
  1983年   4篇
  1982年   4篇
  1981年   2篇
  1980年   4篇
  1979年   5篇
  1978年   3篇
  1977年   4篇
  1976年   3篇
  1974年   4篇
  1973年   4篇
  1970年   2篇
  1969年   2篇
排序方式: 共有856条查询结果,搜索用时 15 毫秒
821.
This paper discusses the underlying causes behind the masculinization of poverty during the period of 1957–1981 in Sweden. Testable hypotheses are derived from a theoretical framework. The findings suggest that the male role as breadwinner disappeared during the analysed period. Lowly educated men and especially male immigrant labour lost their labour market position when industrial society gave way to a new post-industrial society, with an expanding service sector bringing numerous new employment opportunities for women. When sick or unemployed, social assistance was the only social security these men had available. On the other hand, the welfare-state expansion targeted women, particularly single mothers and widows, and thus reduced the number of native women claiming social assistance. The findings also point to the process character of the masculinization of poverty, arguing that women gained significantly more than men from the expansion of the welfare state.  相似文献   
822.
Policy diffusion literature generally studies the adoption of similar policies across jurisdictions, but often overlooks how opposing policies or legal constraints may influence the enactment of rigid state constitutional amendments. The current study models the spread of state constitutional amendments designed to prevent future policy change. Using conditional event history analysis on all states from 1999 to 2011 the empirical models analyze the spread of same‐sex marriage prohibitive amendments across the United States. Findings suggest that the nearby adoption of opposing policies encourage state legislatures to introduce prohibitive amendments. The regional diffusion effect suggests that policymakers “protect” their jurisdiction from nearby diffusion forces or seek electoral gains by symbolic protection by committing an already existing policy into the rigid state constitutional framework. Regional policy diffusion may, therefore, be explained by a countermovement mechanism unique to the state constitutional amendment process. This protective strategy among state legislatures and citizens may explain why many policy areas are frequently codified in state constitutions.  相似文献   
823.
Many American state governments have made extensive promises to pay for employees’ health care and other benefits in retirement. Currently estimated at over $1 trillion in unfunded liabilities, these other postemployment benefits (OPEB) are creating a major fiscal problem for state governments. In this article, we examine the politics of OPEB. We seek to explain the variation in the generosity of OPEB across U.S. states. We argue that party competition theories do not adequately explain the outcomes we observe. Instead, we draw on the emerging Schattschneiderian approach to the politics of public policy to show that public union strength conditions a party's incentives to represent unions’ interests. In states where public sector unions are strong, unions can find their way into either party's coalition. We find that Republicans are more responsive to public union interests than either their ideological brand or prior research would suggest. It is only in states where public employees are weak that Republicans can act unilaterally and enact their preference for less government spending. To test our theories, we carry out an empirical analysis using a newly assembled data set of per capita OPEB liabilities across 49 states.  相似文献   
824.
In the late fourteenth century bc of the Aegean Late Bronze Age (LBA), a large walled settlement was established at Korphos: Kalamianos, on the Saronic Gulf coast of the Corinthia, Greece. Archaeological and geological work by the Saronic harbors Archaeological Research Project has succeeded in reconstructing the LBA coastline and likely harbor basins, as well as documenting the well-preserved plan of an entire Late Helladic town. Kalamianos was a short-lived maritime outpost, purposely founded as a component of state expansion in a climate of intense peer-polity competition in LBA (fifteenth–thirteenth centuries bc) Greece.  相似文献   
825.
In the Middle Atlantic region of the United States, landscapes drowned by sea level rise contain scores of prehistoric archaeological sites. These sites provide archaeologists with a rare opportunity to investigate various geologic processes. During the transition from a terrestrial to an offshore setting, the materials associated with an archaeological site are exposed to a series of geochemical processes inherent to the formation of tidal marsh. The duration of the geochemical exposure to tidal marsh is largely dependent on the rate of marine transgression. Here we describe the stages associated with the sulfidization and sulfuricization scheme and the impact to iron-rich lithic artifacts from naturally drowned archaeological sites. Sulfidization and sulfuricization should also impact buried archaeological materials as a result of anthropogenic dredge spoil dumping and the creation of man-made tidal marshes along modern coastlines. Our results indicate that the surfaces of an iron-rich artifact, as well as its interior are visually and geochemically altered by prolonged exposure to the anaerobic conditions of a tidal marsh. Not only should researchers be cautious about making lithic material identification on artifacts found within coastal tidal marsh areas, but museum curators should be aware of the damaging impact of long-term aerobic storage. The geochemical tidal marsh scheme that has altered or corroded iron-rich lithic artifacts in the nearshore zone is an expression of a process that has impacted numerous earlier prehistoric sites currently located on the continental shelf or beneath the coastal estuaries around the world.  相似文献   
826.
827.
    
Indigenous knowledges play a critical role in addressing the environmental crisis, and the United Nations system has adopted a suite of international treaties to protect and strengthen Indigenous peoples’ rights, which are often described as biocultural rights. Because World Heritage Areas are nominated and monitored by UNESCO, an initial hypothesis in this study was that such areas would be subject to higher than normal standards in regard to Indigenous people’s biocultural rights. By reference to the Greater Blue Mountains World Heritage Area, Australia, this research examined how the international legislative framework influences conservation practices. We held semi-structured interviews with conservation and Indigenous local experts and compared park management practices in the Area against those used in an Indigenous Protected Area. Findings align with the literature and suggest that Indigenous and scientific knowledge systems can generate new insights for the Area and other sites. Yet, Indigenous knowledges are only marginally applied in practice. Some barriers to full participation of Indigenous people are specific to the colonial history of the area. Yet, findings point to a lack of action by Australian governments and UNESCO, and that needs to be redressed. The study calls attention to the need to support and resource Indigenous people to enable collaborative partnerships to yield significant benefits for biodiversity and protection of Country.  相似文献   
828.
    
Our project uses the narrative policy framework (NPF) to explore narrative effects on attitudes about transgender rights. The framework focuses on the stories that are told about public policy. As opposed to conceptualizing communications as informational, NPF suggests that getting lost in the story is primary for attitude change. We also incorporate a perspective taking exercise to examine its effects on individual attitudes. Using an experiment on 1784 American adults, we found that individuals who received the inclusive transgender policy narrative by either watching or reading the narrative held views more supportive of transgender rights, with the effect greater for watching than reading. Those who experienced greater narrative transportation, being more lost in the story, reported more supportive attitudes. We further find that those with traits that lead them to become more imaginatively involved in stories occasionally are more greatly affected by watching policy narratives than those who are less imaginatively involved. However, perspective taking did not influence attitudes and weakened the treatment effects of the narratives. Our findings suggest stories can affect policy attitudes and beliefs, which may be conceptually distinct from traditional framing-based accounts and implies distinctive causal mechanisms that result in attitude change.  相似文献   
829.
    
Accurately estimating the length of Vehicle Routing Problem (VRP) distances can inform transportation planning in a wide variety of delivery and service provision contexts. This study extends the work of previous research where multiple linear regression models were used to estimate the average distance of VRP solutions with various customer demands and capacity constraints. This research expands on that approach in two ways: first, the point patterns used in estimation have a wider range of customer clustering or dispersion values as measured by the Average Nearest Neighbor Index (ANNI) as opposed to just using a Poisson or random point process; second, the tour coefficient adjusted by this complementary spatial information is shown to exhibit statistically more accurate estimations. To generate a full range of ANNI values, point patterns were simulated using a Poisson process, a Matern clustering process, and a simple sequential inhibition process to obtain random, clustered, and dispersed point patterns, respectively. The coefficients of independent variables in the models were used to explain how the spatial distributions of customers influence the VRP distances. These results demonstrate that complementary spatial data can be used to improve operational results, a concept that could be applied more broadly.  相似文献   
830.
Drawing from the literature on public participation and stakeholder collaboratives, this article investigates the influence of power and wealth, as well as political and economic context on the output of stakeholders advisory committees convened to formulate state greenhouse gas (GHG) mitigation policies. Using small sample regression techniques, we analyze the outputs of stakeholder groups in 18 states that have completed Climate Action Plans to reduce GHGs. We find that an increase of 1 percent in the number of energy industry representatives that participate in Climate Action Councils significantly predicts a 4 percent reduction of GHG mitigation targets for the energy sector. More surprisingly, the results also show that where the utilities represent a larger share of the state economy, the Climate Action Plans identify more aggressive GHG reduction goals for the energy sector. We also find that the political orientation of the executive of the state is not correlated with GHG mitigation requirements for the energy sector, suggesting that GHG mitigation is less partisan at the state level than in Washington, DC. We find no evidence that state wealth is associated with GHG mitigation requirements. Finally, we suggest additional research needed to clarify the role of stakeholder participation processes in the evolving arena of climate change policy.  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