全文获取类型
收费全文 | 9834篇 |
免费 | 352篇 |
国内免费 | 543篇 |
专业分类
系统科学 | 391篇 |
丛书文集 | 188篇 |
教育与普及 | 43篇 |
理论与方法论 | 11篇 |
现状及发展 | 63篇 |
综合类 | 10032篇 |
自然研究 | 1篇 |
出版年
2024年 | 40篇 |
2023年 | 107篇 |
2022年 | 169篇 |
2021年 | 156篇 |
2020年 | 178篇 |
2019年 | 148篇 |
2018年 | 156篇 |
2017年 | 198篇 |
2016年 | 190篇 |
2015年 | 325篇 |
2014年 | 417篇 |
2013年 | 306篇 |
2012年 | 492篇 |
2011年 | 497篇 |
2010年 | 366篇 |
2009年 | 476篇 |
2008年 | 419篇 |
2007年 | 646篇 |
2006年 | 559篇 |
2005年 | 504篇 |
2004年 | 430篇 |
2003年 | 454篇 |
2002年 | 355篇 |
2001年 | 338篇 |
2000年 | 367篇 |
1999年 | 300篇 |
1998年 | 254篇 |
1997年 | 278篇 |
1996年 | 219篇 |
1995年 | 216篇 |
1994年 | 189篇 |
1993年 | 141篇 |
1992年 | 155篇 |
1991年 | 158篇 |
1990年 | 138篇 |
1989年 | 138篇 |
1988年 | 90篇 |
1987年 | 85篇 |
1986年 | 48篇 |
1985年 | 20篇 |
1984年 | 1篇 |
1981年 | 2篇 |
1955年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
991.
Particle methods for multiscale simulation of complex flows 总被引:3,自引:2,他引:1
GEWei MAJingsen ZHANGJiayuan TANGDexiang CHENFeiguo WANGXiaowei GUOLi LIJinghai 《科学通报(英文版)》2005,50(11):1057-1069
The multi-scale structures of complex flows have been great challenges to both theoretical and engineering researches, and multi-scale modeling is the natural way in response. Particle methods (PMs) are ideal constitutors and powerful probes of multi-scale models, owing to their physical insight and computational simplicity. In this paper, the role of different PMs for multi-scale modeling of complex flows is critically reviewed and possible development of PMs in this background is prospected, with the emphasis on pseudo-particle modeling (PPM). The performances of some different PMs are compared in simulations and new development in the fundamentals and applications of PPM is also reported, demonstrating PPM as a unique PM for multi-scale modeling. 相似文献
992.
Breakdown of lawsonite subsequent to peak UHP metamorphism in the Dabie terrane and its implication for fluid activity 总被引:4,自引:0,他引:4
LIXuping LIYiliang SHUGuiming 《科学通报(英文版)》2005,50(13):1366-1372
Abundant occurrences of quartz vein within eclogites in the Dabie-Sulu orogen provide us an opportunity to study metamorphic fluid flow during subduction and exhumation of continental crust. It is, however, usually short of petrological constraints on pressure and temperature of vein formation. This study focuses on kyanite-quartz veins within Iow-T/high-P eclogite in the Dabie terrane that contain unique polycrystalline aggregates, interpreted as pseudomorphs after porphyroblasts of lawsonite. Coesite pseudomorphs were found for the first time in garnet from eclogite, resulting in a revised estimate of peak P-T conditions at 670℃ and 3.3 GPa for the eclogite. This indicates a stability field at graphite/diamond transition, thus upgrading the HP unit to a UHP unit. Neither foliation texture, undulose extinction of quartz nor coesite were observed in quartz veins,although the peak P-T conditions were estimated the same as that in host eclogite in light of thermodynamic calculation based on mineral assemblage in kyanite-quartz veins.Therefore, the formation of the kyanite-quartz veins as wellas the breakdown of lawsonlte into the kyanite-quartz-zoisite assemblage took place during exhumation subsequent to the peak UHP conditions. In this regard, the continental subduction not only brought the water of water-bearing mineral such as lawsonite into the deep mantle, but also released the water from the mineral during exhumation. 相似文献
993.
《科学通报(英文版)》2005,50(Z1):111-111
The average geothermal gradient in the Qin-shui Basin, Shanxi Province, North China, estimated from temperature logging data of 20 boreholes is 28.2±1.03℃/km. The thermal conductivities of 39 rock samples are measured and 20 heat flow values are obtained. The estimated heat flow ranges from 44.75 mW7m2 to 101.81 mW/m2, with a mean of 62.69±15.20 mW/m2. The thermal history reconstruction from the inversion of vitrinite data, using Ther-model for Windows 2004, reveals that the average paleo-heat flow at the time of maximum burial in late Jurassic to early Cretaceous is 158.41 mW/m2 for the north part, 119.57 mW/m2 for the central part and 169.43 mW/m2for the south part of the basin respectively. The reconstruction of the buried history of the strata indicates that the age for the end of sedimentation and the beginning of erosion for the basin is 108-156 Ma, and that the eroded thickness of the strata is 2603 m in the north, 2291 m in the central, and 2528.9 m in the south of the basin respectively. The "higher in the north and the south, lower in the central" distribution pattern of the paleo-heat flow coincides with the distribution of the coal-bed methane spatially and temporally, which shows that the coal-bed methane is controlled by the paleo-geotem-perature field in the basin. 相似文献
994.
LM_2钢经1050℃快速加热淬火后,基体晶粒尺寸可细化至4.2μm 以下,碳化物平均截线长小于0.32μm。处理后的钢在830~850℃,■=(1.0~2.3)×10~(-2)min~(-1)变形时均可获得较好的超塑性,其最大延伸率为183%,而流变应力仅55.2MPa。在超塑变形中,碳化物长大倾向比单纯温度作用下要大,但不明显。由于该铜原始组织中存在一定数量的一次碳化物,直接影响其超塑性的较好发挥。 相似文献
995.
《科学通报(英文版)》1992,37(15):1283-1283
996.
997.
998.
采用量纲分析法建立实验相似理论并建立模拟实验平台,采用示踪剂方法观测在不同套管间距、流量条件下的流场分布情况,并用高清相机记录。以此归纳总结出盐岩水平溶腔腔内卤水运移可分为三个作用区:对流扩散区、缓冲扩散区和饱和沉淀区。计算了各区域的运移范围,并将实验得出的数据依据相似比换算成实际工程中的数值,为现场盐岩水平溶腔的高速高效建造提供指导。 相似文献
999.
提出了一种用于配电网快速潮流计算和仿真信息可视化的新方法:结合十字链表与关联矩阵,给出了阻抗矩阵自动生成算法,并可以任意顺序求解各支路电流和各内节点电压;提出了基于right-looking LU分解法的并行高斯消去算法,利用GPU(图形处理器)加速求解复系数回路阻抗方程组;采用GIS(地理信息系统)和虚拟现实技术,对潮流计算结果进行仿真可视化.仿真算例表明,该方法对节点编号无特殊要求,适用于有环、无环的配电网潮流计算,具有计算速度快、精度高、仿真结果显示直观形象的优点. 相似文献
1000.
利用侧面透明的模型箱和铝管半模桩模拟了开口管桩在砂土中的沉桩过程.分别测量了不同桩径和不同相对密实度开口管桩完全闭塞时的土塞高度.结果表明桩径越大,相对密实度越小,则土塞高度越大.利用高分辨率数码摄像设备观察到了土塞形成的三个阶段,重点分析了土塞内几个特征砂颗粒的移动轨迹和压桩过程中孔隙率和接触数的变化,从细观尺度出发探讨开口管桩沉桩过程中砂土的变形机制和土塞形成机理.利用Geodip软件分析了桩土接触面处的砂粒长轴定向和平均配位数,分析表明,土塞形成过程中颗粒原先的结构被打破以及发生了剧烈旋转,颗粒重新进行分布.在模型试验基础上,通过二次开发PFC2D颗粒流程序对沉桩全过程进行离散元仿真模拟.数值模拟结果表明,PFC2D能够模拟开口管桩从开始刺入砂土到形成土塞并最终呈现闭口管桩性态的整个过程. 相似文献