全文获取类型
收费全文 | 42555篇 |
免费 | 882篇 |
国内免费 | 1887篇 |
专业分类
系统科学 | 3271篇 |
丛书文集 | 1137篇 |
教育与普及 | 113篇 |
理论与方法论 | 121篇 |
现状及发展 | 892篇 |
研究方法 | 4篇 |
综合类 | 39600篇 |
自然研究 | 186篇 |
出版年
2024年 | 28篇 |
2023年 | 120篇 |
2022年 | 181篇 |
2021年 | 163篇 |
2020年 | 201篇 |
2019年 | 178篇 |
2018年 | 147篇 |
2017年 | 221篇 |
2016年 | 209篇 |
2015年 | 349篇 |
2014年 | 1000篇 |
2013年 | 783篇 |
2012年 | 1263篇 |
2011年 | 1140篇 |
2010年 | 965篇 |
2009年 | 1254篇 |
2008年 | 1410篇 |
2007年 | 2543篇 |
2006年 | 2520篇 |
2005年 | 2486篇 |
2004年 | 2250篇 |
2003年 | 2264篇 |
2002年 | 1683篇 |
2001年 | 1785篇 |
2000年 | 1290篇 |
1999年 | 1614篇 |
1998年 | 1184篇 |
1997年 | 1389篇 |
1996年 | 1597篇 |
1995年 | 1624篇 |
1994年 | 1760篇 |
1993年 | 1384篇 |
1992年 | 1201篇 |
1991年 | 1565篇 |
1990年 | 1643篇 |
1989年 | 1346篇 |
1988年 | 1224篇 |
1987年 | 670篇 |
1986年 | 404篇 |
1985年 | 232篇 |
1984年 | 49篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1955年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
《复旦学报(自然科学版)》2015,54(1)
本文设计了在FPGA上实现的一款带全数字的延时锁定环(DLL)反馈的TDC电路,该TDC采用了延迟内插法延迟链结构.解决了利用FPGA配置电路对FPGA内部开关参数进行高低温(-55~125℃)测试的问题.延迟链选择的是FPGA中快速进位链,在0.18μm工艺FPGA上,分辨率在25℃下能达到167ps.与另外一种在反熔丝结构FPGA上实现的TDC相比,分辨率在0℃,25℃,50℃分别提高了16.8%,16.5%,16.7%.在相同温度下,分辨率的变化基本保持一致,但反熔丝FPGA上的TDC需要对编码链进行反复的调整,而本文的TDC通过DLL锁定就可以完成对延迟链的调整,大大减小了开发和设计的时间和成本. 相似文献
92.
潮滩作为陆海交互区,面积宽广,测量困难,历史地形资料缺失,已经严重影响到潮滩的开发利用。以辐射沙脊群潮滩为实验区,利用1987年前后的TM、MSS影像提取不同潮情下的系列水边线,运用Mike21水动力模型模拟遥感图像对应时刻下的瞬时海面高度,为水边线赋值,进而通过地形反复迭代得到数字高程模型。结果表明,在辐射沙脊群潮滩区,水边线法获取的地形结果与海图上测点的相关性较高,决定系数R~2达0.864,绝对平均误差0.37 m,均方根误差0.41 m,地形结果可用于进一步的潮滩地貌演变分析。 相似文献
93.
冉晓莉 《重庆三峡学院学报》2015,(2)
中国抗日战争爆发之后,身处美国的赛珍珠参与和组织了大量的社会活动:创作小说、发表演讲、成立东西方协会、编纂《亚洲》杂志等。赛珍珠以支持抗战为主题的演说和文章都充分体现出她对中国的关注和热爱,对于“中国必胜”的信念,以及对中日民族精神和中美关系的独到见解,为中国赢得美国甚至世界各国人民的同情和支持,为中国抗战做出了不可忽略的贡献。 相似文献
94.
95.
提出了一种单基地多输入多输出(multiple-input multiple-output, MIMO)阵列中的协方差矩阵重构的无网格波达方向(direction-of-arrival, DOA)估计方法。该方法通过降维处理将MIMO阵列等效为信噪比(signal-to-noise ratio, SNR)提升的均匀线列阵,将目标方位估计问题转化为混合范数最小化(mixed norm minimization, MixNM)稀疏信号重构问题。进一步给出了与该稀疏重构问题等价的基于网格的凸优化问题,并模型化为半定规划来求解。为了解决网格大小影响估计性能的问题,利用了等价均匀线列阵的托普利兹结构,模型化为半定规划问题来重构无噪声协方差矩阵,最后通过范德蒙分解来估计目标方位。与传统的基于MixNM方位估计方法相比,该方法减少了优化变量个数。与其他离网格方法相比,该方法估计精度不受网格大小的影响,且能够估计相干源目标。实验仿真验证了该方法的有效性。 相似文献
96.
熊良平 《西昌学院学报(自然科学版)》2019,33(3):46-48
为解决工艺品设计中复杂曲面的重构问题,以陶瓷小猪为例,利用逆向工程软件对工艺品复杂曲面进行逆向重构及数字化设计,得到相应的数字模型。通过检测对比,重构的数字模型与实物关键表面偏差均在0.08 mm范围以内,大大提高了复杂曲面的产品设计开发能力,缩短了开发周期,提高了生产效率。 相似文献
97.
Penelope Greenslade 《Journal of Natural History》2018,52(33-34):2197-2207
A new species of Friesea was found in East Antarctica and is described here as Friesea eureka sp. nov. This is the first new collembolan species to be described from the Antarctic continent in 30 years, even though ice-free areas have been intensively surveyed over that time. It brings to five the number of described species of the genus Friesea known from the Antarctic continent and Peninsula, so is the most speciose genus of Collembola in the region. However, one of these, F. grisea Schäffer, comprises a number of cryptic species of different molecular lineages. The new species is distinguished by having 4 + 4 ocelli plus 1 + 1 hardly visible, a very reduced furca, up to four or five faintly clavate tenent hairs, four anal spines and four spinose chaetae in adult. The restricted distribution of the species emphasises the importance of protecting ice-free areas on the continent as they often contain at least one locally endemic faunal species
www.zoobank.org/urn:lsid:zoobank.org:pub:865B9AE6-0428-4364-99A4-AF38A764D6D9 相似文献
98.
Ivanklin Soares Campos-Filho Jonathas Teixeira Lisboa Giovanna Monticelli Cardoso 《Journal of Natural History》2018,52(7-8):457-482
To date, the family Pudeoniscidae includes six species and three genera, Pudeoniscus, Brasiloniscus and Iansaoniscus, with distributions restricted to Brazil. Here, we redefine the family Pudeoniscidae based on the discovery of a new genus and two new species, Oxossioniscus pataxo sp. nov. and Oxossioniscus akoko sp. nov., from the Brazilian Atlantic forest in the state of Bahia, and on the examination of Pudeoniscus birabeni and Pudeoniscus obscurus. Moreover, P. obscurus is re-described and new records are provided for P. birabeni.
http://www.zoobank.org/urn:lsid:zoobank.org:pub:A0123730-C623-49CE-8665-AE17FDDF994A. 相似文献
99.
This paper aims at closing a gap in recent Weyl research by investigating the role played by Leibniz for the development and consolidation of Weyl's notion of theoretical (symbolic) construction. For Weyl, just as for Leibniz, mathematics was not simply an accompanying tool when doing physics—for him it meant the ability to engage in well-guided speculations about a general framework of reality and experience. The paper first introduces some of the background of Weyl's notion of theoretical construction and then discusses particular Leibnizian inheritances in Weyl's ‘Philosophie der Mathematik und Naturwissenschaft’, such as the general appreciation of the principles of sufficient reason and of continuity. Afterwards the paper focuses on three themes: first, Leibniz's primary quality phenomenalism, which according to Weyl marked the decisive step in realizing that physical qualities are never apprehended directly; second, the conceptual relation between continuity and freedom; and third, Leibniz's notion of ‘expression’, which allows for a certain type of (surrogative) reasoning by structural analogy and which gave rise to Weyl's optimism regarding the scope of theoretical construction. 相似文献
100.
A small amount of cerium (below 1.0 wt%) addition to AZ91 alloy have been investigated on the hot tearing susceptibility (HTS) at a cooling rate of 1.5Ks?1. The HTS increased to a maximum value with a cerium addition of 0.6 wt% and then decreased to a stable status as cerium was gradually added. Due to high chemical activity, cerium into the melts can react with aluminum to form an Al11Ce3 intermetallic compound. X–ray diffraction results also confirmed the existence of Al11Ce3. The Al11Ce3 increased with the presence of the needle-like and block morphology. As cerium levels increased, the amount of Mg17Al12 decreased. The variations between Mg17Al12 and Al11Ce3 resulted in a similar normal distribution of the HTS in AZ91 alloy. The findings were further verified through the microstructure evolution and the surface morphology of fracture. 相似文献