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   1959篇
  免费   61篇
  国内免费   46篇
教育   1204篇
科学研究   407篇
各国文化   14篇
体育   128篇
综合类   99篇
文化理论   4篇
信息传播   210篇
  2024年   1篇
  2023年   5篇
  2022年   35篇
  2021年   75篇
  2020年   46篇
  2019年   40篇
  2018年   39篇
  2017年   45篇
  2016年   34篇
  2015年   84篇
  2014年   110篇
  2013年   174篇
  2012年   148篇
  2011年   148篇
  2010年   149篇
  2009年   140篇
  2008年   94篇
  2007年   124篇
  2006年   125篇
  2005年   110篇
  2004年   57篇
  2003年   51篇
  2002年   54篇
  2001年   54篇
  2000年   32篇
  1999年   24篇
  1998年   20篇
  1997年   16篇
  1996年   7篇
  1995年   2篇
  1994年   5篇
  1993年   8篇
  1992年   2篇
  1989年   1篇
  1988年   2篇
  1987年   1篇
  1986年   1篇
  1984年   1篇
  1976年   1篇
  1957年   1篇
排序方式: 共有2066条查询结果,搜索用时 15 毫秒
11.
议信息时代图书馆员的角色转变及素质要求   总被引:10,自引:0,他引:10  
赵康 《情报探索》2007,(10):19-20
指出信息时代图书馆员的角色定位由传统的图书馆员向具有时代特色的现代化信息馆员角色的转变,并重点阐述了信息馆员应具备的信息素质,以及提高信息素质的途径。  相似文献   
12.
Modern high-security cryptography and optical communication call for covert bit sequences with high coding capacity and efficient authentication. Stimuli-responsive lasing emissions with easily distinguishable readout are promising in the coding field as a novel cryptographic primitive, while the application is frequently restricted by the limited number of emission states. Here, we report a strategy of achieving multiple competitive lasing signals in responsive organic microspheres where a donor–acceptor pair was introduced. The competitive lasing from the donor and acceptor was reversibly switched by modulating the competition between the radiative rate of the donor and the rate of energy transfer, and the generated multiple lasing signals enabled a quaternary coding for recognizable cryptographic implementation. Data encryption and extraction were demonstrated using a 4 × 4 microlaser array, showing vast prospects in avoiding the disclosure of security information. The results offer a comprehensive understanding of excited-state dynamics in organic composite materials, which may play a major role in high-security optical recording and information encryption.  相似文献   
13.
讨论了当前Web软件开发中MVC设计模式及J2EE多层分布式体系构架各自存在的缺点,提出了在MVC设计模式中引入J2EE框架与技术的思想。通过对现有的两种流行MVC模式进行比较,阐述了Spring MVC的优势及Spring MVC架构的基本流程。  相似文献   
14.
渐江曾生活于现今的安徽地域,对安徽的人文风貌在其画作中描绘了许多。渐江的绘画画风笔墨严谨、格调简约,对描绘的自然景物高度概括,虽然用墨偏淡,但不显虚空。画面形式具有现代设计学的韵味,构图独特。这种当时的新视觉形式,不仅影响了中国的山水画,而且也给安徽建筑景观设计在形式和意境方面带来了影响和启示。  相似文献   
15.
Soybean accounts for more than half of the global production of oilseed and more than a quarter of the protein used globally for human food and animal feed. Soybean domestication involved parallel increases in seed size and oil content, and a concomitant decrease in protein content. However, science has not yet discovered whether these effects were due to selective pressure on a single gene or multiple genes. Here, re-sequencing data from >800 genotypes revealed a strong selection during soybean domestication on GmSWEET10a. The selection of GmSWEET10a conferred simultaneous increases in soybean-seed size and oil content as well as a reduction in the protein content. The result was validated using both near-isogenic lines carrying substitution of haplotype chromosomal segments and transgenic soybeans. Moreover, GmSWEET10b was found to be functionally redundant with its homologue GmSWEET10a and to be undergoing selection in current breeding, leading the the elite allele GmSWEET10b, a potential target for present-day soybean breeding. Both GmSWEET10a and GmSWEET10b were shown to transport sucrose and hexose, contributing to sugar allocation from seed coat to embryo, which consequently determines oil and protein contents and seed size in soybean. We conclude that past selection of optimal GmSWEET10a alleles drove the initial domestication of multiple soybean-seed traits and that targeted selection of the elite allele GmSWEET10b may further improve the yield and seed quality of modern soybean cultivars.  相似文献   
16.
In this systematic review of literature that spans 1975–2015, integrated reading and writing interventions for students with learning disabilities (LD) or students with academic difficulties were evaluated to understand the extant research, identify encouraging practices, and guide future research. Ten studies met inclusion criteria and each study was evaluated according to the relevant What Works Clearinghouse (WWC) design standards. Eight of the 10 investigations were conducted with students in grades 4–8. While only 4 of the 10 studies met WWC design with or without reservations, results from these studies are encouraging. Study findings suggest several areas for immediate future research relating to methodological and treatment variables and considerations for classroom instruction in order to respond to advanced expectations for the successful integration of reading and writing across subjects. In addition to employing stronger experimental designs and additional replications of encouraging studies, future research should explore the utility of integrated reading and writing interventions with secondary students with who have academic difficulties.  相似文献   
17.
康红芹 《职教通讯》2011,(11):41-44
女性教育对女性发展以及社会进步具有重要的作用。然而,我国女性的受教育程度整体不高,素质普遍较低。对此,从终身教育的视角出发,重新审视女性发展,对女性自身以及整个社会具有重要的现实意义。  相似文献   
18.
讨论了产业结构变化的非均衡过程与成长的制约因素,分析了漳州市工业化进程与产业结构成长,漳州市产业结构成长的体制条件和途径。认为可通过下列措施促进漳州产业结构的成长:1.切实转变政府职能,主动培育和引导市场;2.加快农业产业结构调整,培育农村新型专业经济合作组织;3.推动农村的城镇化和工业化过程,走多元化发展道路;4.加快地方国有企业的改制,培育具有地方特色的新兴企业群;5.追求经济可持续发展,提高经济中的科技含量。  相似文献   
19.
现行GDP指标由于不能反映经济发展对资源环境造成的负面影响,而使绿色GDP的核算势在必行。如何在我国现行政治体制下———政府在经济发展中居主导地位,进行绿色GDP核算,以实现其制度设置的初衷,无疑是我们面对的最现实的问题。本文结合我国官员激励机制的研究对我国进行绿色GDP核算的相关制度性安排提出了一些基本设想。  相似文献   
20.
试论认知弹性理论的学习环境设计思想   总被引:2,自引:0,他引:2  
本文从教育信息资源开发思想研究的角度,对认知弹性理论的相关思想进行初步分析。文章分析和讨论了认知弹性理论的基本性质;并对该理论特别注重的多媒体计算机学习系统(学习环境)的设计思想,从目的、原则、设计思路和亮点等几个方面进行了分析和阐述。另外,对知识的获得、媒体环境等相关问题作了初步地探讨。  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