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   2278篇
  免费   35篇
  2024年   2篇
  2023年   18篇
  2022年   23篇
  2021年   20篇
  2020年   72篇
  2019年   36篇
  2018年   38篇
  2017年   36篇
  2016年   35篇
  2015年   61篇
  2014年   42篇
  2013年   122篇
  2012年   133篇
  2011年   190篇
  2010年   150篇
  2009年   223篇
  2008年   190篇
  2007年   208篇
  2006年   180篇
  2005年   143篇
  2004年   39篇
  2003年   84篇
  2002年   51篇
  2001年   49篇
  2000年   43篇
  1999年   24篇
  1998年   20篇
  1997年   11篇
  1996年   22篇
  1995年   9篇
  1994年   13篇
  1993年   11篇
  1992年   1篇
  1991年   10篇
  1990年   2篇
  1989年   1篇
  1985年   1篇
排序方式: 共有2313条查询结果,搜索用时 15 毫秒
91.
唐开元年间先后在渤海北境、黑水靺鞨地方设置勃利州、黑水军、黑水都督府。从文献与考古材料双重视角入手,可以对与黑水都督府建置有关的勃利州(渤州)、黑水靺鞨道、渤海都督府、安静都督府、黑水靺鞨思慕部等问题进行梳理和考索,又结合渤海与黑水靺鞨军事对抗导致黑水靺鞨自牡丹江中下游不断北移的历史背景,再考黑水都督府的具体地望。研究渤海都督府、安静都督府辖区以及黑水靺鞨思慕部相对位置关系,又考虑其为具有地区战略意义的和扼守渤海上京以北、贯穿南北黑水靺鞨交通孔道的军政重镇,萝北县江岸古城当为唐开元年间设置的黑水都督府治所所在。  相似文献   
92.
Zhen, Y.Y., Wang, G.X. &; Percival, I.G., August 2016. Conodonts and tabulate corals from the Upper Ordovician Angullong Formation of central New South Wales, Australia. Alcheringa 41, xxx–xxx. ISSN 0311-5518.

The Angullong Formation is the youngest Ordovician unit exposed in the Cliefden Caves area of central New South Wales. Its maximum age is constrained by a Styracograptus uncinatus graptolite Biozone fauna at the very top of the underlying Malongulli Formation, but the few fossils previously reported from higher in the Angullong Formation are either long-ranging or poorly known. From allochthonous limestone clasts in the middle part of the formation, we document a conodont fauna comprising Aphelognathus grandis, A. solidum, Aphelognathus sp., Aphelognathus? sp., Belodina confluens, Drepanoistodus suberectus, Panderodus gracilis, Panderodus sp., Phragmodus undatus, Pseudobelodina inclinata and Pseudobelodina? sp. aff. P. obtusa, which supports correlation with the Aphelognathus grandis Biozone (late Katian) of the North American Midcontinent succession. The species concepts of Aphelognathus and Pseudobelodina are reviewed in detail. Associated corals are exclusively tabulates, dominated by agetolitids, including Agetolites angullongensis sp. nov., Heliolites orientalis, Hemiagetolites breviseptatus, Hemiagetolites sp. cf. H. spinimarginatus, Navoites sp. cf. N. circumflexa, Plasmoporella bacilliforma, P. marginata, Quepora sp. cf. Q. calamus and Sarcinula sp. Affinities of the coral fauna from the Angullong Formation are closer to faunas from northern NSW and northern Queensland than to the locally recognized Fauna III of late Eastonian age in central NSW. We propose a subdivision of Fauna III to account for this difference, with the late Katian Fauna IIIB characterized by the incoming of agetolitid corals. The currently known distribution of representatives of this group with adequate age constraints suggests that agetolitids possibly originated in North China, subsequently migrating to Tarim, South China and adjacent peri-Gondwanan terranes while also spreading eastward to northern Gondwana, where they progressively moved through eastern Australia to reach the central NSW region by the early Bolindian.

Yong Yi Zhen* () and Ian G. Percival (), Geological Survey of New South Wales, W.B. Clarke Geoscience Centre, 947953 Londonderry Road, Londonderry, NSW 2753, Australia; Guangxu Wang (), State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, 39 East Beijing Road Nanjing 210008 PR China.  相似文献   
93.
星云大师对艺术的看法,集中在对建筑之形、书画之神与音乐之功的论述中.在星云大师看来,佛教建筑在外形上应具有简单、庄严、自然之特点;书画艺术之美在于能生动地传达生命与真情、慈悲喜舍的精神;佛教音乐应具有令身心安住、弘扬佛法的功用,这一并体现了星云大师倡导将佛教与艺文相结合的理念,期盼借助艺术的巨大力量而使佛法更加流通普照,净化世间.  相似文献   
94.
The Lv family tombs in Lantian, Shaanxi Province are one of the most important archaeological sites of China in recent years, providing numerous objects and a wealth of information for the study of the history of the Northern Song dynasty. There were a large number of exquisite cultural relics unearthed from the tombs, including one porcelain box containing white powder, which was identified as women's makeup. The phase composition, microstructure, thermal properties and characteristics of the trace elements in the unearthed white cosmetic powder were comprehensively analysed by X‐ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry – thermogravimetry (DSC–TG), Fourier transform infrared (FT–IR) microscopy and inductively coupled plasma atomic emission spectroscopy (ICP–AES). The white makeup powder was determined to be a product made from high‐quality freshwater pearls. These results, for the first time, showed evidence that freshwater pearl powder was used as a cosmetic in ancient China using archaeological objects, providing scientific evidence and new clues to enrich and expand research into the ancient Chinese cosmetic materials.  相似文献   
95.
96.
ABSTRACT

In December 1984, a private Japanese academic organization, the “Nanjing Incident Research Committee” (Nankin Jiken Chōsa Kenkyūkai), sent a survey team to visit Nanjing, with the aim of obtaining more evidence on the Nanjing Massacre to counter the internal debate within Japan. Through the coordination by the “Office of the Leading Team on History, Museums and Monuments for the Nanjing Massacre” during the visit, the survey team was able not only to gather historical materials, meet with survivors, and tour historical sites, but also to engage in exchanges with Nanjing researchers and students of Nanjing University. This visit to Nanjing further publicized Japan’s internal debate on the Nanjing Massacre in China, while also representing an unprecedented effort for collaboration between China and Japan in research on the Nanjing Massacre.  相似文献   
97.
Choosing individual private entrepreneurs to be members of the People's Congress (PC) or the Chinese People's Political Consultative Conference (CPPCC) is one of the most important mechanisms for ‘cooperative capitalism’ in China. This article aims to answer two questions: First, what are the differences between factors for winning a seat at the PC and a seat at the CPPCC, respectively? Second, is there any difference between factors that have a significant impact on winning a seat at the county-township level and the prefecture-and-above level of the PC or CPPCC? Based on empirical findings, I have coined the term ‘wealthy-gentry politics’ to conceptualise the fact that behaving as a member of the socially responsible ‘gentry’ plays an increasingly significant role at the higher level and in the PC compared to the lower level and the CPPCC, while economic wealth is just a threshold and party membership is not a guarantee.

挑选私营企业家个体进入两会是中国“合作型资本主义”的一个最重要机制。本文回答两个问题。1)获得人大代表的因素与获得政协委员的因素有何区别?2)获得县镇级两会代表和地级以上两会代表的影响因素是否有区别? 根据实证研究,笔者发明“财—绅政治”的概念来描述一个事实:负有社会责任的社会贤达在高一级的人大较之低一级的政协发挥了越来越大的作用,财富仅仅是门槛,党籍也不起决定性作用。  相似文献   
98.
In this article, a Simulink simulation block with the finite element function is developed on the basis of S-function and implemented as the numerical substructure of real-time dynamic hybrid testing. Thereby, a real-time dynamic hybrid testing system coupling finite element calculation and shaking table testing is achieved. Using the developed system, a shear frame mounted on the soil foundation is tested, in which the shear frame is simulated as the physical model and the foundation is simulated as the finite element model with 132 degrees of freedom. Several cases of the dynamic behavior of soil-structure interaction are studied.  相似文献   
99.
The optically stimulated luminescence (OSL) decay curve is assumed to consist of a number of first-order exponential components. Improper estimation of the number of components leads to under-or over-fitting of the curve under consideration. Hence, correct estimation of the number of components is important to accurately analyze an OSL decay curve. In this study, we investigated the possibility of using the Bayesian Information Criterion to estimate the optimal number of components in an OSL decay curve. We tested the reliability of this method using several hundred measured decay curves and three simulation scenarios. Our results demonstrate that the quality of the identification can be influenced by several factors: the measurement time and the number of channels; the variability of the decay constants; and the signal-to-noise ratios of a decaying component. The results also suggest that the Bayesian Information Criterion has great potential to estimate the number of components in an OSL decay curve with a moderate to high signal-to-noise ratio.  相似文献   
100.
本文在对寺观彩塑的制作材料和制作工艺剖析的基础上,探讨了物理因素、化学因素、生物因素及人为因素对彩塑产生的破坏,并提出了针对性的保护措施,该研究对寺观彩塑的修复及保护具有参考价值.  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