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   2427篇
  免费   17篇
各国政治   181篇
工人农民   60篇
世界政治   150篇
外交国际关系   135篇
法律   1447篇
中国政治   16篇
政治理论   444篇
综合类   11篇
  2023年   17篇
  2020年   40篇
  2019年   41篇
  2018年   53篇
  2017年   70篇
  2016年   61篇
  2015年   37篇
  2014年   45篇
  2013年   240篇
  2012年   65篇
  2011年   90篇
  2010年   58篇
  2009年   62篇
  2008年   83篇
  2007年   79篇
  2006年   70篇
  2005年   67篇
  2004年   55篇
  2003年   67篇
  2002年   53篇
  2001年   63篇
  2000年   53篇
  1999年   55篇
  1998年   20篇
  1997年   25篇
  1996年   37篇
  1995年   25篇
  1994年   21篇
  1993年   23篇
  1992年   40篇
  1991年   47篇
  1990年   48篇
  1989年   55篇
  1988年   48篇
  1987年   39篇
  1986年   40篇
  1985年   32篇
  1984年   32篇
  1983年   24篇
  1982年   21篇
  1981年   21篇
  1980年   16篇
  1979年   29篇
  1978年   28篇
  1977年   19篇
  1973年   14篇
  1971年   21篇
  1970年   21篇
  1968年   19篇
  1967年   16篇
排序方式: 共有2444条查询结果,搜索用时 15 毫秒
411.
Abstract

The stated goal of the Housing Act of 1949 is “a decent home and suitable living environment for every American family.” It is time that we delivered on that commitment. Contrary to popular opinion, this does not require spending more money on housing assistance. It can be achieved without additional funds by shifting all funds from less cost‐effective methods for delivering housing assistance to choice‐based vouchers as soon as current contractual commitments permit and by gradually reducing the large subsidies to current voucher recipients. The proposal to replace the Housing Choice Voucher Program with a block grant to states can contribute to this goal by precluding the use of the block grant funds for project‐based assistance, increasing the targeting of assistance to the poorest families, and including the fraction of recipients with extremely low incomes in the formula for determining the performance rating of state programs.  相似文献   
412.
413.
414.

The association between improving economic conditions and declining growth of population has led economists and demographers to hypothesise a direct relationship between indicators of economic development and fertility rates. Using recent National Family Health Survey data and the 1991 Census to explore factors contributing to fertility rates in India, we found that economic variables explain 70 per cent of the interstate variations in India's fertility rates. However, several non-economic variables explain an even greater proportion, for example, indicators of female autonomy explain 84 per cent of the variations. Our analysis demonstrates that to successfully explain Indian fertility rates, models must rely heavily on non-economic variables.  相似文献   
415.
416.
This article describes a new method for calculating judicial workload in dependency or child abuse and neglect cases. In contrast to traditional judicial workload methods, the method described herein produces estimates of judicial workload that take into account the complex role of the juvenile dependency court judge—a role that includes both on‐ and off‐the‐bench activities. The method provides workload estimates that give guidance to courts not only about the minimally sufficient judicial resources needed to accommodate current caseload needs, but also what level of judicial resources would be required to hold substantive dependency court hearings that comport with nationally recognized practice recommendations. The article reviews commonly used judicial workload methods, outlines the new method, and uses a pilot of the method as an example of how the method works in practice. Broader implications of this workload method are also discussed.  相似文献   
417.
There is little analysis of the impact of the United States on Mexican prisons. This research examines the presence of United States citizens and the “War on Drugs” in Tamaulipas, Mexico, prisons. There has been a marked increase in the number of U.S. citizens, and prisoners, in general, in Tamaulipas prisons in the last three years (90% of these are incarcerated for drug trafficking). This increase is attributed to Mexican President Salinas' active support for the “War on Drugs” and success in capturing narcotics traffickers. This has led to overcrowding in Tamaulipas border prisons, in comparison with Victoria located in the interior. We also interviewed U.S. prisoners located in Reynosa State prison. The majority indicated abuse at the hands of Federal Judicial Police while arrested, and were planning to transfer out of Mexico through the Mexican-U.S. treaty exchange.  相似文献   
418.
The theory of action upon which high‐stakes accountability policies are based calls for systemic reforms in educational systems that will emerge by pairing incentives for improvement with extensive and targeted technical assistance (TA) to build the capacity of low‐performing schools and districts. To this end, a little discussed and often overlooked aspect of the No Child Left Behind Act (NCLB) mandated that, in addition to sanctions, states were required to provide TA to build the capacity of struggling schools and Local Education Agencies (LEAs, or districts) to help them improve student achievement. Although every state in the country provides some form of TA to its lowest performing districts, we know little about the content of these programs or about their efficacy in improving student performance. In this paper, we use both quantitative and qualitative analyses to explore the actions taken by TA providers in one state—California—and examine whether the TA and support tied to California's NCLB sanctions succeeds in improving student achievement. Like many other states, California requires that districts labeled as persistently failing under NCLB (in Program Improvement year 3, PI3) work with external experts to help them build the capacity to make reforms that will improve student achievement. California's lowest performing PI3 districts are given substantial amounts of funding and are required to contract with state‐approved District Assistance and Intervention Teams (DAITs), whereas the remaining PI3 districts receive less funding and are asked to access less intensive TA from non‐DAIT providers. We use a five‐year panel difference‐in‐difference design to estimate the impacts of DAITs on student performance on the math and English language arts (ELA) standardized tests relative to non‐DAIT TA during the two years of the program intervention. We find that students in districts with DAITs perform significantly better on math California Standards Tests (CSTs) averaged over both treatment years and in each of the first and second years. We do not find evidence that students in districts with DAITs perform higher on ELA CSTs over the combined two years of treatment, although we find suggestive evidence that ELA performance increases in the second year of treatment relative to students in districts with non‐DAIT TA. Ordinary least squares (OLS) regressions that explore the association between specific activities fostered by DAITs and changes in districts’ gains in achievement over the two years of treatment show that DAIT districts that report increasing their focus on using data to guide instruction, shifting district culture to generate and maintain high expectations of students and staff, and increasing within‐district accountability for student performance, have higher math achievement gains over the course of the DAIT treatment. In addition, DAIT districts that increase their focus on ELA instruction and shift district culture to one of high expectations have higher ELA achievement gains than do DAIT districts that do not have a similar focus. © 2012 by the Association for Public Policy Analysis and Management.  相似文献   
419.
Abstract: The AmpF?STR® MiniFilerTM PCR Amplification Kit is designed to genotype degraded and/or inhibited DNA samples when the AmpF?STR® IdentifilerTM PCR Amplification Kit is incapable of generating a complete genetic profile. Validation experiments, following the SWGDAM guidelines, were designed to evaluate the performance of MiniFiler. Data obtained demonstrated that MiniFiler, when used in conjunction with Identifiler, provided an increased ability to obtain genetic profiles from challenged samples. The optimum template range was found to be between 0.2 and 0.6 ng, with 0.3 ng yielding the best results. Full concordance was achieved between the MiniFiler kit and Identifiler kit except in a single case of a null allele at locus D21S11. Numerous instances of severe heterozygous peak imbalance (<50%) were observed in single source samples amplified within the optimum range of input DNA suggesting that caution be taken when attempting to deduce component genotypes in a mixture.  相似文献   
420.
Knowledge of how nurses experience the process of secluding a patient can be useful in improving the quality of patient care and in the prevention of work related stress in nurses. This study describes personal experiences of nurses throughout the seclusion process. The emotions which came to surface in semi-structured interviews with 8 nurses were categorized in three main themes (Tension, Trust and Power) and a stress response curve was identified in the seclusion process, with specific feelings in each phase. Feelings denied in former studies such as feeling superior, anger and disgust were found in the interviews in this study.  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