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   1318篇
  免费   53篇
各国政治   45篇
工人农民   255篇
世界政治   98篇
外交国际关系   78篇
法律   585篇
中国政治   20篇
政治理论   280篇
综合类   10篇
  2023年   4篇
  2022年   4篇
  2021年   6篇
  2020年   24篇
  2019年   29篇
  2018年   46篇
  2017年   49篇
  2016年   38篇
  2015年   41篇
  2014年   37篇
  2013年   175篇
  2012年   32篇
  2011年   39篇
  2010年   33篇
  2009年   45篇
  2008年   46篇
  2007年   51篇
  2006年   41篇
  2005年   49篇
  2004年   63篇
  2003年   44篇
  2002年   47篇
  2001年   26篇
  2000年   28篇
  1999年   19篇
  1998年   14篇
  1997年   30篇
  1996年   33篇
  1995年   16篇
  1994年   26篇
  1993年   20篇
  1992年   29篇
  1991年   23篇
  1990年   18篇
  1989年   14篇
  1988年   13篇
  1987年   8篇
  1986年   15篇
  1985年   12篇
  1984年   9篇
  1983年   11篇
  1982年   11篇
  1981年   11篇
  1980年   6篇
  1979年   5篇
  1978年   7篇
  1977年   7篇
  1976年   5篇
  1975年   3篇
  1974年   4篇
排序方式: 共有1371条查询结果,搜索用时 15 毫秒
231.
Abstract

There are persistent differences in homeownership rates across racial and ethnic groups. Homeownership rates for whites are over 20 percentage points higher than for blacks or Hispanics. This paper uses a model of the housing tenure decision to gain a better understanding of these racial and ethnic differentials in homeownership and employs a decomposition technique that has been applied to labor market discrimination to report the results of the empirical testing of two hypotheses: (1) race (ethnicity) influences the probability of ownership through differences in household endowments (income, education, age, gender, and family type) and market endowments (price and location); and (2) race (ethnicity) directly influences the probability of ownership through racial or ethnic discrimination and other factors that may be correlated with race or ethnicity.

We find endowment effects important in explaining the persistent racial and ethnic disparities in homeownership. In brief, logit analysis of 1989 American Housing Survey (AHS) national sample data reveals that 81 percent (78 percent) of the differences between the predicted probability of ownership between black and white households (Hispanic/non‐Hispanic) are due to differences in group endowments. Direct effects explain 19 percent of the black‐white differentials and 22 percent of the Hispanic/non‐Hispanic differentials. Because the direct effects are modeled as residual differences, it must be realized that the residual components could also be capturing the influence of important omitted or harder to measure variables internal to the market process and correlated with race or ethnicity. These include wealth, household location, employment history, credit history, and cultural predisposition toward homeownership.  相似文献   
232.
Abstract

This study investigates hypotheses regarding the association of census tract variables with the risk for homelessness. We used prior address information reported by families entering emergency shelters in two large U.S. cities to characterize the nature ofthat distribution.

Three dense clusters of homeless origins were found in Philadelphia and three in New York City, accounting for 67 percent and 61 percent of shelter admissions and revealing that homeless families’ prior addresses are more highly concentrated than the poverty distribution in both cities. The rate of shelter admission is strongly and positively related to the concentration of poor, African‐American, and female‐headed households with young children in a neighborhood. It is also correlated with fewer youth, elderly, and immigrants. Such areas have higher rates of unemployment and labor force nonpartici‐pation, more housing crowding, more abandonment, higher rates of vacancy, and higher rent‐to‐income ratios than other areas.  相似文献   
233.
Abstract

Automated underwriting (AU) systems have become the tool of choice in mortgage lending decisions. While these systems provide significant benefits to mortgage originators and investors, questions have been raised about their impact on underserved populations. The questions focus on the relative accuracy of AU compared with manual underwriting and whether AU has increased the flow of mortgage credit to underserved consumers.

Using information from Freddie Mac's Loan Prospector AU service, we provide statistics useful in examining these issues. The data strongly support our view that AU provides substantial benefits to consumers, particularly those at the margin of the underwriting decision. We find evidence that AU systems more accurately predict default than manual underwriters do. We also find evidence that this increased accuracy results in higher borrower approval rates, especially for underserved applicants.  相似文献   
234.
Abstract

Severely distressed public housing developments are being torn down and redeveloped through the HOPE (Housing Opportunities for People Everywhere) VI initiative in cities across the United States. This article examines how families from one HOPE VI site decided where to move and how they fared in building social ties with their new neighbors. Semistructured interviews from a random sample of 41 families with children were analyzed.

Families that chose to move into public housing expressed concern about the unreliability of the Section 8 program and their own ability to pay the extra utility costs involved. Those who used Section 8 vouchers to relocate had more education on average and made this choice to improve the neighborhood for their families. Over the past two years, regardless of what kind of neighborhood they moved into, families have not rebuilt the close ties most of them had in their former neighborhood.  相似文献   
235.
There has been considerable debate regarding the reasons for the observed spatial variation in voting patterns at British general elections since the 1970s. Three separate models can be identified: no regional cleavage; regional economic cleavage; and autonomous regional cleavage. Analysis of data which indicated people's perceptions of their household and regional economic situations over the decade preceding the 1992 general election, together with their personal characteristics and attitudes, allows the first model to be rejected: there are clear regional differences in voting behaviour which cannot be accounted for by personal characteristics alone. Each of the other models is valid: there are clear spatial differences not only in interpretations of personal and regional prosperity, and its causes, but also in electoral responses to that; and there are significant residual regional variations when those are held constant. Approaches to the study of voting in Britain which present spatial variations as merely representations of other causes are thus rejected.  相似文献   
236.
An account of the four expeditions to Chinese Central Asia made at the beginning of the twentieth century by the Hungarian scholar, Aurel Stein; his discoveries and excavations in the ancient cities of the Silk Road, including the famous cache of scrolls he found at Dunhuang. The second part of the article covers the present day activities of the International Dunhuang Project and an expedition made in 2008 to retrace Stein's footsteps and replicate his photographs.  相似文献   
237.
Book reviews     
Bremmer I &; R Tarras (eds), Nations and Politics in the Soviet Successor States. Cambridge: Cambridge University Press, 1993. 565pp., index.

Bulloch J &; H Morris, No Friends but the Mountains: The Tragic History of the Kurds. London: Penguin Books, 1993 (new epilogue). 257pp., index.

Cable J, Gunboat Diplomacy 1919 ‐ 1991: Political Applications of Limited Naval Power. London: Macmillan, 1994, 246pp.

Evans R, Deng Xiaoping and the Making of Modern China. London: Hamish Hamilton, 1993, 339pp.

Gaddis JL, The United States and the End of the Cold War: Implications, Reconsiderations, Provocations. New York: Oxford University Press, 1992, 301pp.

Jeffrey R, What's Happening to India? Punjab, Ethnic Conflict, and the Test for Federalism. London: Macmillan, Second Edition, 1994, pp. ii &; 252pp.

Mazrui AA &; C Wondji (eds), Africa since 1935. Paris: UNESCO; Oxford: Heinemann Educational; Berkeley: University of California Press, 1993. (UNESCO General History of Africa Series, Vol. VIII) xxiii, 1025 pp. Illustrated, maps, plates, bibliography and index.  相似文献   
238.
Although paid television and radio political advertising is banned in the United Kingdom, parties fielding sufficient candidates are entitled to free air time during election campaigns for a fixed number of party election broadcasts (PEBs). Over the years, parties have experimented with a variety of different PEB formats. But the impact of PEBs on voters is underresearched. This article therefore analyzes the influence of PEB viewing in the 1997 British General Election. Though a majority do not view PEBs, those who do are influenced by them, especially in terms of their evaluations of parties and their leaders: Other things being equal, viewers of a party's PEBs become more favorably disposed to the party and its leader than those who do not see the broadcast. Labour and Conservative PEBs have no impact on vote intentions, however. But viewers of Liberal Democrat broadcasts become more likely to support that party. We speculate that this reflects different background levels of media exposure for the major parties as compared to the third party.  相似文献   
239.
Susan Herbst 《政治交往》2013,30(3):253-254
Although news is a social construction that narrates events in the world by assimilating them to existing cultural categories, there are many cultural categories from which to choose. How do journalists determine whether an event calls for a melodramatic frame or an ironic frame or some other narrative convention? Reviewing two recent studies—of news coverage of 9/11 and news coverage in the early 1990s of an accidental killing of a Japanese exchange student in New Orleans—this article argues that the character of “the events themselves” helps limit what narrative frames journalists select.  相似文献   
240.
Raman spectroscopy has found increased use in the forensic controlled substances laboratory in recent years due to its rapid and nondestructive analysis capabilities. Here, Raman spectroscopy as a screening test for methamphetamine in clandestine laboratory liquid samples is discussed as a way to improve the efficiency of a laboratory by identifying the most probative samples for further workup among multiple samples submitted for analysis. Solutions of methamphetamine in ethanol, diethyl ether, and Coleman fuel were prepared in concentrations ranging from 0.5% to 10% w/v, and Raman spectra of each were collected. A concentration‐dependant Raman peak was observed at 1003 per cm in each solution in 4% w/v and greater solutions. Case samples were analyzed and also found to reliably contain this diagnostic peak when methamphetamine was present. The use of this diagnostic indicator can save the forensic controlled substances laboratory time and materials when analyzing clandestine laboratory liquid submissions.  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