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   1000篇
  免费   15篇
  2024年   3篇
  2023年   4篇
  2022年   11篇
  2021年   13篇
  2020年   25篇
  2019年   18篇
  2018年   22篇
  2017年   21篇
  2016年   41篇
  2015年   16篇
  2014年   24篇
  2013年   77篇
  2012年   47篇
  2011年   59篇
  2010年   62篇
  2009年   62篇
  2008年   61篇
  2007年   70篇
  2006年   77篇
  2005年   64篇
  2004年   39篇
  2003年   49篇
  2002年   45篇
  2001年   33篇
  2000年   24篇
  1999年   15篇
  1998年   9篇
  1997年   1篇
  1996年   7篇
  1995年   4篇
  1994年   2篇
  1993年   2篇
  1992年   1篇
  1991年   4篇
  1990年   1篇
  1983年   1篇
  1981年   1篇
排序方式: 共有1015条查询结果,搜索用时 15 毫秒
61.
我国教师资格制度的法制化进程   总被引:4,自引:0,他引:4  
自 1 986年起 ,我国教师资格制度开始由以行政命令、政策规定的弱强制性程度阶段向法令规定的高强制性程度转向 ,即开始了法制化的进程。先后经历了教师资格制度法制规范初步建立阶段 ( 1 986— 1 993年 ) ,教师资格制度的法制规范完善阶段 ( 1 993— 2 0 0 0年 ) ,2 0 0 0年 9月 2 3日 ,我国颁发了《〈教师资格条例〉实施办法》 ,它的出台标志着我国建立起一整套教师资格制度的法制规范体系 ,标志着较为完备的教师资格制度的确立。通过对这一过程的考察 ,有助于增强对我国教师资格制度法制化进程的特点和精神实质的理解 ,从而增强我们依法治教、依法治师的自觉意识。  相似文献   
62.
明清时期,科举制度的推行与家族制度的发展呈现相辅相成的关系,获得功名是许多家族之凝成与延续的重要前提。获得功名的途径大体上分正途与异途两种。从族谱资料的分析可知:家族中的正途出身与异途出身往往相互支撑,共同为家族的延续和发展作出贡献。有的是前期多正途出身,后期多异途出身。有的则先由异途出身,后代逐渐走上正途。从各自的水平和行迹看,异途或许也能在一定程度上起到搜罗遗才的作用。  相似文献   
63.
最近10年来,随着解决三农问题成为中国共产党和政府工作的重中之重,追溯和研究三农历史的论著也层出不穷,最近读了当代中国研究所王瑞芳研究员以考察新中国成立初期土地改革运动为中心写成的《土地制度变动与中国乡村社会变革》(社会科学文献出版社2010年版),感到作者运用历史唯物主义的基本原理和方法,通过透视生产关系的变革来研  相似文献   
64.
城市体系研究主要关注城市的节点性与城际关系两个方面,而城市网络研究将这两个关键要素统一起来,为进一步探讨此问题提供了新的思路。通过城际联系的视角,本文从城市的“中心性”和“中介性”两个维度来重新定义城市的节点地位。基于此,研究分析了铁路交通流视角下近十年来中原城市群城市体系整体和局部的结构变化,试图提供一种网络视角下城市体系演变的不同图景。研究发现:①城市中心性和中介性呈现出截然相反的变化趋势;②高中介性的门户城市更易提升自身地位;③城市中心性的层级结构愈发显著,而中介性更加扁平。在一体化建设的背景下,研究讨论了中原城市群城际体系演变的特征与问题。  相似文献   
65.
The quantitative analysis of glass, ceramics and related silicate systems by means of energy dispersive X-ray fluorescence spectrometry is considered and problems arising from the selective absorption of X-rays in multi-element specimens are discussed. A computer programme written in FORTRAN and based upon a “semi-fundamental parameters” approach to the correction of matrix effects in glass and chemically similar materials is fully described. Model data are provided to enable the programme to be run and tested. An “empirical coefficients” computer programme for the quantitative analysis of silicate systems is outlined and the limitations of this type of programme are pointed out. The importance of adequate sample preparation prior to X-ray spectrometric analysis is stressed.  相似文献   
66.
Abstract

Food security has guided Russia’s food policy since 2010. The article examines the impact of food security policy on the food system. The Russian model of food security combines government intervention in the form of assistance for domestic production while simultaneously restricting market access. Food security does not appear to have a deleterious impact on the food system. We measure impact on four dimensions. Financial support for agriculture continues to increase in nominal rubles. In food production, the beef and dairy branches continue to lag, but increased grain production has made Russia a global leader in grain exports. Average per capita food consumption improved, although the poor consume much less, and the decline of the ruble affects the way Russians shop. The largest impact of food security has been on food trade. Food security policy has brought food to the forefront as an instrument of foreign policy. Food trade is politicized, witnessed by the food embargo against the West and food import bans against Turkey and Ukraine.  相似文献   
67.
This study deployed statistical and spatial (GIS) analyses to test the effects of geographic, demographic and occupational factors in predicting health centre visits among the elderly (≥60 years) with chronic ailments in Kanchanaburi Province, western Thailand. Datasets from the Kanchanaburi Demographic Surveillance System (2004 baseline survey and a 2006 project follow-up) comprised five land-use landscape and occupational strata: urban/semi-urban (industrial), rice field, plantation crop, upland and mixed economy. Travel distance to the nearest health centre was calculated following transportation routes and the GPS coordinates of individual home locations, and the number of healthcare visits under the national free universal coverage (UC) scheme reported for the previous year was used as a dependent variable in regressions. Broadly, the study found that distance was not a significant predictor of the rate of elderly health centres visits for those with co-residing spouses and/or adult children (77% of sample), and for the elderly still working (48% of the sample) who were the least likely to access healthcare. Owning motorised vehicles did not encourage visits, which also varied by land-use and occupational strata.  相似文献   
68.
温湿度是评估博物馆馆藏环境的重要指标。在越来越多的博物馆对温湿度进行监测记录的情况下,需要基于"稳定适宜"的准则,探索一种科学的评估方法,为馆藏环境温湿度的调控治理提供依据。该方法以中长期的博物馆监控数据为基础,通过计算温湿度监控数据的离散度和离散系数,并结合箱线图分析数据的分布情况,对其"稳定适宜"程度进行综合量化评估。结合四川博物院2014年的温湿度监控数据的实例,验证了该方法的有效性。研究结果表明,采用基于离散程度的中长期温湿度数据评估方法,能够为下一步的馆藏环境调控治理提供依据,有助于针对性的改善博物馆文物保存环境。  相似文献   
69.
In this article, we analyze the role of the economic rationale in modern cultural policy decision communication and ask why it remains such an important factor, even though research has argued against it. Based on Luhmann’s system theory, we show how the economic rationale manifests itself in the cultural political communication as parasitic and complementary couplings, and how different communication forms are in play: the indirect, direct, and the both-and form. The point is to construct communicative positions in cultural policy. The positions involve the economic rationale in their own particular way and each of them offers themselves as a communicative platform which the culture politician can optionally step into and out of. The arts system stands out from other systems by not distinguishing itself in one single distinction and coding. In exactly this issue lies the communicative complexity which the communicating cultural politician faces and must handle. As our analysis shows, this complexity is handled by communicating within the economic rationale and coding, with the result that complexity is reduced.  相似文献   
70.
The Krafla geothermal system is located in Iceland's northeastern neovolcanic zone, within the Krafla central volcanic complex. Geothermal fluids are superheated steam closest to the magma heat source, two‐phase at higher depths, and sub‐boiling at the shallowest depths. Hydrogen isotope ratios of geothermal fluids range from ?87‰, equivalent to local meteoric water, to ?94‰. These fluids are enriched in 18O relative to the global meteoric line by +0.5–3.2‰. Calculated vapor fractions of the fluids are 0.0–0.5 wt% (~0–16% by volume) in the northwestern portion of the geothermal system and increase towards the southeast, up to 5.4 wt% (~57% by volume). Hydrothermal epidote sampled from 900 to 2500 m depth has δD values from ?127 to ?108‰, and δ18O from ?13.0 to ?9.6‰. Fluids in equilibrium with epidote have isotope compositions similar to those calculated for the vapor phase of two‐phase aquifer fluids. We interpret the large range in δDEPIDOTE and δ18OEPIDOTE across the system and within individual wells (up to 7‰ and 3.3‰, respectively) to result from variable mixing of shallow sub‐boiling groundwater with condensates of vapor rising from a deeper two‐phase reservoir. The data suggest that meteoric waters derived from a single source in the northwest are separated into the shallow sub‐boiling reservoir, and deeper two‐phase reservoir. Interaction between these reservoirs occurs by channelized vertical flow of vapor along fractures, and input of magmatic volatiles further alters fluid chemistry in some wells. Isotopic compositions of hydrothermal epidote reflect local equilibrium with fluids formed by mixtures of shallow water, deep vapor condensates, and magmatic volatiles, whose ionic strength is subsequently derived from dissolution of basalt host rock. This study illustrates the benefits of combining phase segregation effects in two‐phase systems during analysis of wellhead fluid data with stable isotope values of hydrous alteration minerals when evaluating the complex hydrogeology of volcano‐hosted geothermal systems.  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