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   6012篇
  免费   207篇
各国政治   331篇
工人农民   212篇
世界政治   465篇
外交国际关系   188篇
法律   3537篇
中国共产党   2篇
中国政治   36篇
政治理论   1405篇
综合类   43篇
  2020年   77篇
  2019年   85篇
  2018年   117篇
  2017年   139篇
  2016年   136篇
  2015年   118篇
  2014年   107篇
  2013年   677篇
  2012年   154篇
  2011年   147篇
  2010年   127篇
  2009年   133篇
  2008年   169篇
  2007年   167篇
  2006年   175篇
  2005年   159篇
  2004年   161篇
  2003年   158篇
  2002年   161篇
  2001年   211篇
  2000年   197篇
  1999年   152篇
  1998年   85篇
  1997年   75篇
  1996年   57篇
  1995年   75篇
  1994年   65篇
  1993年   68篇
  1992年   105篇
  1991年   106篇
  1990年   125篇
  1989年   112篇
  1988年   101篇
  1987年   107篇
  1986年   122篇
  1985年   133篇
  1984年   92篇
  1983年   93篇
  1982年   68篇
  1981年   73篇
  1980年   60篇
  1979年   56篇
  1978年   63篇
  1977年   50篇
  1976年   42篇
  1975年   57篇
  1974年   67篇
  1973年   65篇
  1972年   44篇
  1969年   46篇
排序方式: 共有6219条查询结果,搜索用时 15 毫秒
971.
972.
The European Project is currently experiencing the most serious crisis in its sixty year existence. Past crises have produced transformational leaders who used them to build more Europe. Today transformational leadership at the European level has been replaced with transactional and laissez faire leaders and is being challenged by charismatic populist ‘strong men’ who oppose more Europe. The structure of the EU, the rise of new media, the large flows of immigrants and refugees combined with economic stagnation and the decline of traditional ideologies have undermined the ability of leaders to shape effective policies. Emerging leaders will be grounded in the nation state and in a more Gaullist Europe.  相似文献   
973.
The centenary of the 1916 Rising marks a time of peaceful commemoration, across the island of Ireland. However, several violent dissident republican groups wish to seize it as an opportunity to re-organise in an attempt to bolster and legitimise their sustained paramilitary campaign. This study seeks to provide a greater understanding of how this paramilitary activity has manifested from 2007 to mid-2015. We do this by assessing target selection, through analysis of the Violent Dissident Republican (VDR) events database. The data suggest that civilian targets are the most regularly attacked. However, when exclusively analysing targets of detonated explosives, the data show that police, security personnel, and their infrastructure are more consistently targeted. The target selected can and does have an effect on attack method. These findings can both assist in protecting the potential targets of VDR attacks and contribute to the development of a strong nationalised, and localised, counter VDR narrative.  相似文献   
974.
The head is positioned erect for an approximation; yet most facial soft tissue depths (FSTD) used are measured from supine subjects. Depth difference might be significant, but there is a paucity of data to verify. This study compared erect and supine values for 17 landmarks from 30 healthy New Zealand (European population affinity) women (18–30 or 40–55 years) in erect then supine positions. Height, weight, and sonographic FSTD data, totaling 1020 measurements, were obtained. Three midline and seven averaged bilateral values were compared using ANOVA, p values, and Pearson's correlations. Correlative strength of age and body mass index, BMI (kg/m2), was determined by values. Results showed averaged erect and supine differences were significant for four of ten FSTDs. Between individuals, difference was various and not unidirectional. In conclusion, depth differences were observed but not all significant or unidirectional, BMI significantly influenced nine FSTD values, but age group did not.  相似文献   
975.
In forensic science, biological material is typically collected from evidence via wet/dry double swabbing with cotton swabs, which is effective but can visibly damage an item's surface. When an item's appearance must be maintained, dry swabbing and tape‐lifting may be employed as collection techniques that are visually nondestructive to substrates' surfaces. This study examined the efficacy of alternative swab matrices and adhesive lifters when collecting blood and fingerprints from glass, painted drywall, 100% cotton, and copy paper. Data were evaluated by determining the percent profile and quality score for each STR profile generated. Hydraflock® swabs, BVDA Gellifters®, and Scenesafe FAST? tape performed as well as or better than cotton swabs when collecting fingerprints from painted drywall and 100% cotton. Collection success was also dependent on the type of biological material sampled and the substrate on which it was deposited. These results demonstrated that alternative swabs and adhesive lifters can be effective for nondestructive DNA collection from various substrates.  相似文献   
976.
Diaphragmatic defects are a relatively common and benign finding in adults which may be congenital or secondarily acquired. The case files at Forensic Sciences South Australia were reviewed over a 10‐year period from July 2005 to June 2015 for all adult (>17 years) cases in which diaphragmatic hernias were identified at postmortem examination that had either caused or contributed to death. Five cases were found: age range 49–90 years (average 67.2 years); male:female ratio 2:3. Herniated organs included the stomach (N = 3), small (N = 3) and large intestines (N = 2). Mechanisms of death involved lung compression with respiratory failure and/or mediastinal shift, and vascular compromise with gastric or intestinal infarction and/or perforation. Diaphragmatic hernias may not be identified until the time of autopsy and may be quite complex entities to evaluate due to a lack of clinical history and to difficulties in determining their origin and possible contributions to mechanisms of death.  相似文献   
977.
Eleven deaths from crocodile attacks in the Northern Territory, Australia were reviewed. The male:female ratio was 8:3; age range—10–62 years, average 29.4 years. Four children were included (one boy and three girls, aged 10, 11, and two at 12 years), and there were seven aboriginal victims (64%). The attacks were witnessed in eight cases with the victims swimming in freshwater N = 5, standing on a river bank N = 1, fishing in fresh water N = 1, or diving in the sea N = 1. At autopsy, several distinct patterns of injury were observed ranging from complete traumatic disruption of the body with only incomplete remains for examination (N = 5), to crushing of the head with fractures of the skull (N = 4), crushing of the chest with fractures of the ribs and sternum (N = 2), and avulsion of limbs (N = 4). In one case, there was decapitation. Autopsy evaluations were complicated by decomposition and loss of body parts.  相似文献   
978.
Anatomical crania are occasionally encountered in forensic anthropology laboratories when that material is mistaken for forensically significant human remains. Using craniometric analyses and statistical measures of sample homogeneity, we determine whether anatomical material can be described as a single, homogenous group or as a diverse mix of populations. Twenty‐one interlandmark distances were collected from 85 anatomical preparations. Distance measures were calculated between all pairs using a pooled within‐sample variance/covariance matrix and then subjected to a Defrise‐Gussenhoven test between each paired distance to test whether each pair was drawn randomly from the same population. In the Defrise‐Gussenhoven analysis, twenty‐two percent (n = 66) of the 300 pairwise combinations were significant at the 0.05 level or below. The level of homogeneity suggests a majority of that material originated from the subcontinent of India or West Asia. Therefore, anatomical material can be viewed as a moderately homogenous group, but with a shared taphonomic history.  相似文献   
979.
Intimate partner violence (IPV) is a prevalent problem associated with multiple negative outcomes for survivors’ well-being. Coping has emerged as an important construct in understanding the association between IPV and survivors’ well-being. Research is needed to better understand the contextual complexity of IPV as a stressor, determine if IPV is a unique stressor, and document survivors’ coping experiences. This article reports findings of a qualitative study with 25 female survivors and 6 service providers. Analysis of interview data shows 3 key themes: (a) coping strategies used by survivors; (b) challenges and barriers to coping with IPV; and (c) IPV as a unique stressor. Despite multiple challenges and barriers to coping with IPV, survivors use multiple, varied strategies to cope with their experiences of abuse. However, given the context and nature of IPV, violent victimization is a distinct stressor with unique barriers that often require IPV-specific coping strategies.  相似文献   
980.
This article reports findings from a qualitative follow-up investigation of a mandated parenting and safety program for system-involved female IPV survivors. Participants were contacted 12 months or more after program completion and invited to participate in individual interviews. The interviews focused on the longer-term life changes survivors attributed to the program. Data were collected from 38 survivors. Qualitative analysis determined 4 key themes: relationship changes (e.g., most women were no longer with abusive partners), parenting changes (e.g., improved communication and discipline strategies), personal life changes (e.g., improved help-seeking and self-esteem), and new or ongoing challenges (e.g., financial stress). Overall, findings suggest that tailored, mandated programming — when positive and empowering — may lead to some longer-term beneficial outcomes.  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