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   548篇
  免费   15篇
  国内免费   7篇
管理学   32篇
民族学   1篇
人口学   5篇
丛书文集   37篇
理论方法论   24篇
综合类   397篇
社会学   48篇
统计学   26篇
  2023年   4篇
  2022年   1篇
  2021年   7篇
  2020年   7篇
  2019年   5篇
  2018年   11篇
  2017年   8篇
  2016年   18篇
  2015年   13篇
  2014年   23篇
  2013年   62篇
  2012年   21篇
  2011年   35篇
  2010年   28篇
  2009年   32篇
  2008年   34篇
  2007年   30篇
  2006年   26篇
  2005年   23篇
  2004年   25篇
  2003年   25篇
  2002年   27篇
  2001年   18篇
  2000年   25篇
  1999年   12篇
  1998年   5篇
  1997年   7篇
  1996年   4篇
  1995年   11篇
  1994年   4篇
  1993年   6篇
  1991年   5篇
  1990年   1篇
  1989年   3篇
  1988年   1篇
  1987年   1篇
  1984年   1篇
  1982年   1篇
排序方式: 共有570条查询结果,搜索用时 437 毫秒
71.
实践中,虚假广告侵权一直被视为一般侵权行为,其归责原则适用传统的过错责任原则。实际上,虚假广告侵权在许多方面都有自己的特殊性,这使过错责任原则适用于虚假广告侵权显现出很大的局限性,已经不能很好地发挥法律责任的教育、预防及制裁功能。这种局限性也为虚假广告侵权适用一种更为严格的归责原则创造了条件。  相似文献   
72.
73.
报道了两个乌骨鸡场2~4周龄乌骨鸡暴发鸡传染性法氏囊病的流行情况;临床症状,病理剖检及组织学、血清学诊断结果;经抗法氏囊病高免卵黄抗体治疗,取得了满意的效果。建议乌骨鸡养殖场应按合理的免疫程序对乌骨鸡进行IBD免疫接种。  相似文献   
74.
本文以我国货币当局2002-2012年资产的月度数据为研究样本,探究货币当局的资产增长动态机制,以期能够甄别其动态演进路径.实证结果认为,近些年来,我国货币当局月度资产的增长动态强势,但月度增长率极不稳定,波动幅度较大,并且资产的急剧扩张主要是由我国外汇储备剧增所致,衍生了资产的国内外地域分布不均衡问题,加剧了资产管理的国际风险;另外,月度资产水平值具有非平稳性,而其一阶差分值具有平稳性,其演化动态路径遵循ARMA(2,4)过程模型.  相似文献   
75.
在环境侵权中,无过错责任原则的运用加强了对环境民事损害的受害者的民事救济,但是也带来了一系列问题,诸如有可能掩盖行为人的过错,掩盖政府责任,以及可能使一些在无过错情况下致害的企业陷入困境甚至破产,而即使企业破产其有限的资产也不足以满足众多受害者的正当赔偿要求。因此,在民法框架下,环境侵权中民事责任的承担,最多应当止于过错推定原则。再往前走一步,就会走到无过错责任原则,走到这一步,就应当超出民法的范围,走向社会法领域,而不应再停留在民法之中。  相似文献   
76.
Different methodologies for fault diagnosis in multivariate quality control have been proposed in recent years. These methods work in the space of the original measured variables and have performed reasonably well when there is a reduced number of mildly correlated quality and/or process variables with a well-conditioned covariance matrix. These approaches have been introduced by emphasizing their positive or negative virtues, generally on an individual basis, so it is not clear for the practitioner the best method to be used. This article provides a comprehensive study of the performance of diverse methodological approaches when tested on a large number of distinct simulated scenarios. Our primary aim is to highlight key weaknesses and strengths in these methods as well as clarifying their relationships and the requirements for their implementation in practice.  相似文献   
77.
《Risk analysis》2018,38(8):1634-1655
The work in the article presents the development of an application guide based on feedback and comments stemming from various railway actors on their practices of SIL allocation to railway safety‐related functions. The initial generic methodology for SIL allocation has been updated to be applied to railway rolling stock safety‐related functions in order to solve the SIL concept application issues. Various actors dealing with railway SIL allocation problems are the intended target of the methodology; its principles will be summarized in this article with a focus on modifications and precisions made in order to establish a practical guide for railway safety authorities. The methodology is based on the flowchart formalism used in CSM (common safety method) European regulation. It starts with the use of quantitative safety requirements, particularly tolerable hazard rates (THR). THR apportioning rules are applied. On the one hand, the rules are related to classical logical combinations of safety‐related functions preventing hazard occurrence. On the other hand, to take into account technical conditions (last safety weak link, functional dependencies, technological complexity, etc.), specific rules implicitly used in existing practices are defined for readjusting some THR values. SIL allocation process based on apportioned and validated THR values is finally illustrated through the example of “emergency brake” subsystems. Some specific SIL allocation rules are also defined and illustrated.  相似文献   
78.
Abstract

Objective: To examine changes in diagnoses/treatment for 12 mental health (MH) conditions, previous use of campus MH services, and willingness to seek MH services in the future. Participants: ACHA–NCHA II participants from 2009 to 2015 (n?=?454,029). Methods: Hierarchical binary logistic regression with step 1 controlling for demographics and step 2 considering time. Results: Time was significant except for bipolar disorder, bulimia, and schizophrenia with increases for all conditions except substance abuse. Anxiety (OR?=?1.68), panic attacks (OR?=?1.61), and ADHD (OR?=?1.40) had the highest odd ratios. Use of MH services at current institution (OR?=?1.30) and willingness to utilize services in the future (OR?=?1.37) also increased over time. Conclusions: Based on a national sample, self-reported diagnoses/treatment of several MH conditions are increasing among college students. This examination of a variety of MH issues can aid college health professionals to engage institutional stakeholders regarding the resources needed to support college students’ MH.  相似文献   
79.
AimTo assess the antenatal care utilisation among Syrian refugees in Tehran.MethodsThis cross-sectional study was performed in 2016 in Tehran. As the refugees live in the city, we used Respondent Driven Sampling method for finding participants. Data were collected from interviews by a newly graduated Syrian general practitioner.FindingsIn total, 231 women participated in the study. The mean (standard deviation) number of antenatal care visits was 3.73 (1.41) and 131(56.7%) women received at least four visits. The mean (standard deviation) number of antenatal care visits was higher among women with four or more living children compared with those with four or more: 3.47 (1.35); 95% confidence interval 3.28 to 3.66 vs. 2.82 (1.64); 95% confidence interval 2.25 to 3.40, p = 0.01. The mean (standard deviation) number of antenatal care visits was higher among women whose spouses had academic degrees compared with those with lower education: 4.13 (1.37); 95% confidence interval 3.86–4.40 vs. 3.28 (1.31); 95% confidence interval 3.05–3.52, p < 0.001.ConclusionsAntenatal care utilisation of Syrian women in Tehran complied with neither national guidelines of Iran nor the recommendations of World Health Organization. However, antenatal care utilisation of Syrian women in Tehran was higher than the main destinations of Syrian refugees. Syrian women kept their own cultural behaviour in terms of antenatal care utilisation.  相似文献   
80.
天然气大部分通过远距离运输和销售,管道运行的可靠性对天然气市场具有重要的影响。分析讨论了影响道运行可靠性的主要因素,并据此提出提高管道运行可靠性的对策与措施,供管道运行管理者参考。  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