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   2463篇
  免费   51篇
  国内免费   66篇
电工技术   8篇
综合类   33篇
化学工业   52篇
金属工艺   8篇
机械仪表   19篇
建筑科学   125篇
矿业工程   8篇
能源动力   12篇
轻工业   51篇
水利工程   8篇
石油天然气   10篇
武器工业   2篇
无线电   85篇
一般工业技术   33篇
冶金工业   1238篇
原子能技术   5篇
自动化技术   883篇
  2020年   15篇
  2017年   17篇
  2016年   38篇
  2015年   27篇
  2014年   64篇
  2013年   64篇
  2012年   81篇
  2011年   109篇
  2010年   111篇
  2009年   154篇
  2008年   132篇
  2007年   176篇
  2006年   181篇
  2005年   125篇
  2004年   105篇
  2003年   106篇
  2002年   77篇
  2001年   54篇
  2000年   41篇
  1999年   25篇
  1998年   20篇
  1997年   24篇
  1995年   27篇
  1994年   15篇
  1992年   17篇
  1990年   20篇
  1989年   29篇
  1988年   26篇
  1987年   19篇
  1986年   43篇
  1985年   27篇
  1984年   21篇
  1982年   19篇
  1981年   30篇
  1979年   17篇
  1977年   17篇
  1976年   15篇
  1975年   17篇
  1973年   19篇
  1971年   25篇
  1970年   21篇
  1969年   23篇
  1968年   46篇
  1967年   15篇
  1966年   21篇
  1965年   32篇
  1964年   27篇
  1961年   15篇
  1958年   14篇
  1956年   18篇
排序方式: 共有2580条查询结果,搜索用时 15 毫秒
991.
The rebuttals offered by the authors whose data we reanalyzed (see record 2009-06703-001)—A. R. McConnell & J. M. Leibold (see record 2001-11532-008); J. C. Ziegert & P. J. Hanges (see record 2005-05102-011)—address secondary issues that do not alter our primary message: The evidence for the predictive validity of the race Implicit Association Test is too fragile to support the strong claims that have been made about the pervasiveness of prejudice and the linkages between Implicit Association Test scores and discriminatory behavior. Greater caution in both the legal and scientific communities is warranted. Most importantly, scientific research on implicit bias needs greater transparency and willingness to open raw data to critical scrutiny, not greater trust and deference among researchers. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
992.
Presents the citation, biography, and selected bibliography for Robert D. Weitz, this year's (1994) winner of the American Psychological Association's Award for Distinguished Professional Contributions--Distinguished Professional Contributions to Applied Psychology as a Professional Practice. From Weitz's citation: "Dr. Robert D. Weitz has filled a lifetime of energy, enthusiasm, and achievement into his 50-plus year career in professional psychology. As a clinician, educator, editor, and activist, he has been an inspiration and role model for generations of clinical and applied psychologists who have benefited from the efforts of the early pioneers of the profession. More than a dreamer, Bob has manifested the ability to turn ideas into reality, with the development of his own successful clinical practice, the evolution of two professional schools of psychology, a scholarly journal for practitioners, and the significant advances for the profession in the political arena. Of his greatest accomplishment, he has obtained these goals while earning and maintaining the love and respect of his colleagues and preserving an unmatched zest for life and people." (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
993.
The minutes presented in this article are the official record of the actions of the Association taken during the year by both the Board of Directors (Board) and the Council of Representatives (Council). The minutes consist of: Elections, Awards, Membership, and Human Resources; Ethics; Board of Directors; Divisions and State, Provincial, and Territorial Associations; Organization of the APA; Publications and Communications; Convention Affairs; Educational, Professional, Ethnic Minority, International, Financial, and Scientific Affairs; Public Interest; and Central Office. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
994.
在数据挖掘过程中数据预处理至关重要,针对不同的领域和行业,数据预处理的方法千差万别。详细描述信用卡客户细分和关联规则分析中的数据预处理过程,首先从信用卡系统数据库中选择与分析主题有关的数据表,然后对经过选取后得到的数据,通过数据清理、集成、变换和归约处理过程得到挖掘所需的样本数据。  相似文献   
995.
"The purpose of this paper is to present a method for identifying those members of the American Psychological Association having a doctor's degree who are likely to make important contributions to psychology. The approach is essentially that of considering at one time two bits of information about a person." "The sample… consists of 1,974 persons who became Associates of APA and received the doctor's degree during the period 1941 to 1951… ." Three configurations are discussed: (1) those who became APA Associates before they received the doctor's degree; (2) those who became Associates after they received the degree; (3) those who became Associates the same year they received the degree. Criteria of contributions to psychology are publication in the 1954 APA journals and donation of money to APA Building Fund in 1954 and 1955. Three tables of results are presented. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
996.
Presents the citation, biography, and selected bibliography for Melba J. T. Vasquez, the 2007 recipient of the American Psychological Association's Award for Distinguished Professional Contributions to Independent or Institutional Practice in the Private Sector. Also presented is an article based on the author's award address delivered at the APA's 115th annual meeting, held August 17-20, 2007, in San Francisco, California. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
997.
The necessity of serving a year-long internship has become an important issue in the training of counseling psychologists. This is especially true for anyone who might be interested in obtaining employment in a college or university counseling center. This particular issue has serious implications for prospective interns who are being trained in non-APA-approved counseling psychology programs who wish to be employed in college and university counseling centers. Currently, there are 25 centers that have active counseling psychology internship training programs, and although only half of them are APA-approved now, the majority of them will be in the near future (Dorn, 1984). If nothing else, they will be facing a restrictive environment when it comes to the development of their professional careers as well as in obtaining an internship in a setting that will be more positively regarded by prospective counseling center employers. In an effort to fully clarify the issue of whether APA-approved counseling psychology internship sites in college and university counseling centers are selecting candidates from non-APA-approved counseling psychology training sites, a brief questionnaire was mailed to each individual who was serving an internship in one of the 13 fully or provisionally APA-approved college and university counseling center sites (APA, 1981) during the 1981-1982 academic year. The results of this survey indicate that although the majority of counseling psychology interns selected by these sites are from APA-approved training programs, intern applicants from non-APA-approved training programs do have an opportunity to serve an APA-approved internship in one of these sites. These results should not be interpreted optimistically, however. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
998.
数据挖掘产生的模式如何被处理,对IDS系统的实时性和有效性至关重要。该文提出了一种模式编码算法,对模式进行量化处理,从而高效地检测入侵。同时,文中还从理论上论证了模式编码量化检测方法与基于相似性理论的模式检测方法的等效性,证明任何用相似性理论实现的入侵模式检测算法均可用编码量化处理来等效实现。  相似文献   
999.
业务流设计是网络工程的一部分,主要是进行网络性能评价和网络性能优化,我们提出了两种新的业务流分析方法--具有路径约束的关联规则算法PRAR和具有时态路径约束的关联规则算法TPRAR,这两种算法对于全网业务进行相关性分析,是一种基于业务的分析方法,PRAR算法和TPRAR算在Aprior算法的基础上,分别引入了路径约束和时态约束与路径约束,使之更加体现网络业务的特性,使用这两种算法,可以充分利用已有数据,分析已有业务的行为,且可以预测未来业务的行为。  相似文献   
1000.
李晓虹  杨有 《计算机科学》2007,34(9):142-144
关联规则挖掘是数据挖掘的一个重要研究方向,其算法主要有Apriori算法和FP—growth算法,它们需要多次扫描事务数据库,严重影响算法的效率。为了减少扫描事务数据库的次数,本文提出一种基于线性链表(LinearLinker)的LL算法,它只需扫描事务数据库一次,把事务数据库转换为线性链表LL,进而对LL进行关联规则挖掘。实验表明,LL算法的时间开销明显优于Apriori算法和FP—growth算法,且LL算法通过定义备用候选频繁项目集,有效地支持了关联规则的更新挖掘。  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