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   831篇
  免费   29篇
各国政治   57篇
工人农民   19篇
世界政治   65篇
外交国际关系   83篇
法律   370篇
中国政治   8篇
政治理论   236篇
综合类   22篇
  2023年   4篇
  2021年   4篇
  2020年   5篇
  2019年   4篇
  2018年   10篇
  2017年   23篇
  2016年   26篇
  2015年   16篇
  2014年   12篇
  2013年   136篇
  2012年   17篇
  2011年   29篇
  2010年   19篇
  2009年   23篇
  2008年   27篇
  2007年   26篇
  2006年   36篇
  2005年   40篇
  2004年   38篇
  2003年   42篇
  2002年   32篇
  2001年   15篇
  2000年   17篇
  1999年   21篇
  1998年   12篇
  1997年   16篇
  1996年   14篇
  1995年   12篇
  1994年   11篇
  1993年   13篇
  1992年   11篇
  1991年   10篇
  1990年   6篇
  1989年   9篇
  1988年   10篇
  1987年   10篇
  1986年   17篇
  1985年   6篇
  1984年   6篇
  1983年   10篇
  1982年   7篇
  1981年   7篇
  1980年   4篇
  1979年   6篇
  1978年   5篇
  1977年   6篇
  1975年   6篇
  1974年   5篇
  1971年   3篇
  1969年   3篇
排序方式: 共有860条查询结果,搜索用时 15 毫秒
851.
852.
Abstract

The purpose of this study was to investigate views toward physician-assisted suicide (PAS) as patient illness (terminal, not terminal), patient mental health (depressed, not depressed) and physician background (preoccupied, not preoccupied with death) are varied. Participants (N = 211) read a newspaper article and trial summary involving a PAS then gave their impressions of the patient, physician and PAS. Patient mental health did not affect decisions, but the preoccupied physician's testimony was seen as less believable (intent was seen as patient death, not an end of pain and suffering), and he was more likely to be seen as guilty than the non-preoccupied physician (reflected by both verdict and guilt level ratings). The terminal patient was seen as suffering more, wanting suicide more, and making a more rational decision to die than the non-terminal patient. Results are discussed in light of recent legal activity involving PAS.  相似文献   
853.
854.
Scholars, policy makers, and research sponsors have long sought to understand the conditions under which scientific research is used in the policy‐making process. Recent research has identified a resource that can be used to trace the use of science across time and many policy domains. U.S. federal agencies are mandated by executive order to justify all economically significant regulations by regulatory impact analyses (RIAs), in which they present evidence of the scientific underpinnings and consequences of the proposed rule. To gain new insight into when and how regulators invoke science in their policy justifications, we ask: does the political attention and controversy surrounding a regulation affect the extent to which science is utilized in RIAs? We examine scientific citation activity in all 101 economically significant RIAs from 2008 to 2012 and evaluate the effects of attention—from the public, policy elites, and the media—on the degree of science use in RIAs. Our main finding is that regulators draw more heavily on scientific research when justifying rules subject to a high degree of attention from outside actors. These findings suggest that scientific research plays an important role in the justification of regulations, especially those that are highly salient to the public and other policy actors.  相似文献   
855.
Major US federal regulatory decisions are developed and justified using regulatory impact analyses (RIAs) mandated by executive order. We examine the scientific citation activity in RIAs, a unique effort that we believe holds significant potential for understanding the use of science in policymaking. This paper reports preliminary findings from collecting and examining scientific citations in 104 RIAs from 2008–2012. We present evidence indicating that some agencies make extensive use of science in RIAs, that there is substantial variation in use across agencies, and show variation across journals and disciplines cited by regulatory agencies. Finally, we present analysis showing that regulatory policymakers make greater use of research published in highly cited scholarly journals. We conclude by outlining several future directions for research using these data.  相似文献   
856.
The goal of this paper is to describe applications of two recently developed HPLC methods for the analysis and confirmation of the presence of hydrogen peroxide residues in field studies. The procedure utilizes two different HPLC systems, one with post-column derivatization followed by fluorescence detection (HPLC/FD), and the other with electrochemical detection (HPLC/ED). The two systems were utilized to detect hydrogen peroxide in a variety of typical forensic samples including pre- and post-blast samples, as well as a series of environmental control samples. Peroxide-based organic explosives were also examined due to their propensity to produce peroxide residues following detonation. Because samples collected from post-blast scenes are frequently shipped or stored prior to analysis, the effects of storage time, temperature and type of substrate material on the recovery of hydrogen peroxide residues were also investigated. The combined results of the study demonstrate the capability of two HPLC approaches with selective detection in the analysis and investigation of suspected incidents involving peroxide based explosives.  相似文献   
857.
858.
859.
In late February 2008, law enforcement officials in Las Vegas, Nevada, discovered in a hotel room, a copy of The Anarchist Cookbook, suspected castor beans and a "white powder" thought to be a preparation of ricin. Ricin is a deadly toxin from the seed of the castor bean plant (Ricinus communis). The United States regulates the possession, use, and transfer of ricin and it is the only substance considered a warfare agent in both the Chemical and the Biological Weapons Conventions. Six samples obtained from the hotel room were analyzed by laboratories at the Centers for Disease Control and Prevention using a panel of biological and mass spectrometric assays. The biological assays (real time-PCR, time resolved fluorescence and cytotoxicity) provided presumptive evidence of active ricin in each of the samples. This initial screen was followed by an in-depth analysis using a novel, state-of-the-art mass spectrometry-based ricin functional assay and high sensitivity tandem mass spectrometry for protein identification. Mass spectrometric analysis positively identified ricin and confirmed that in each of the samples it was enzymatically active. The tandem mass spectrometry analysis used here is the most selective method available to detect ricin toxin. In each sample, ricin was unequivocally identified along with other R. communis plant proteins, including the highly homologous protein RCA120. Although database searches using tandem mass spectra acquired from the samples indicated that additional controlled substances were not present in these samples, the mass spectrometric results did provide extensive detail about the sample contents. To the best of our knowledge following a review of the available literature, this report describes the most detailed analysis of a white powder for a public health or forensic investigation involving ricin.  相似文献   
860.
Parenting plan evaluators are expert witnesses who offer their opinion. Courts in common law jurisdictions generally do not accept evidence of an opinion as it is not considered to be reliable evidence from which to establish a fact. An exception to that general principle is expert opinion evidence. In short, an opinion from a person with specialized knowledge or expertise about the area in which they are an expert may be sufficiently reliable to form an evidentiary basis from which to make a finding of fact, provided the opinion meets certain criteria. These criteria will be discussed in this article, as well as what is relevant, reliable and persuasive evidence. The relevant legal principles will be examined in an historical and contemporary, theoretical and practical context. The authors reflect on their considerable experience as consumers of expert evidence and apply this to parenting plan evaluations, as well as considering future challenges in the field.  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