全文获取类型
收费全文 | 17262篇 |
免费 | 3250篇 |
国内免费 | 5326篇 |
专业分类
测绘学 | 856篇 |
大气科学 | 2993篇 |
地球物理 | 4600篇 |
地质学 | 11031篇 |
海洋学 | 1895篇 |
天文学 | 853篇 |
综合类 | 1890篇 |
自然地理 | 1720篇 |
出版年
2024年 | 54篇 |
2023年 | 182篇 |
2022年 | 551篇 |
2021年 | 606篇 |
2020年 | 494篇 |
2019年 | 603篇 |
2018年 | 692篇 |
2017年 | 615篇 |
2016年 | 731篇 |
2015年 | 627篇 |
2014年 | 754篇 |
2013年 | 726篇 |
2012年 | 663篇 |
2011年 | 1238篇 |
2010年 | 1029篇 |
2009年 | 1112篇 |
2008年 | 759篇 |
2007年 | 923篇 |
2006年 | 983篇 |
2005年 | 983篇 |
2004年 | 1599篇 |
2003年 | 1108篇 |
2002年 | 887篇 |
2001年 | 745篇 |
2000年 | 666篇 |
1999年 | 785篇 |
1998年 | 746篇 |
1997年 | 736篇 |
1996年 | 577篇 |
1995年 | 491篇 |
1994年 | 511篇 |
1993年 | 620篇 |
1992年 | 516篇 |
1991年 | 320篇 |
1990年 | 194篇 |
1989年 | 196篇 |
1988年 | 159篇 |
1987年 | 117篇 |
1986年 | 97篇 |
1985年 | 57篇 |
1984年 | 48篇 |
1983年 | 50篇 |
1982年 | 48篇 |
1981年 | 37篇 |
1980年 | 14篇 |
1979年 | 15篇 |
1978年 | 14篇 |
1977年 | 17篇 |
1937年 | 16篇 |
1933年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
131.
Wang Deyu Zhang Shanyuan
Associate Prof. Depart of Naval Archi. Ocean Engineering Shanghai Jiaotong University Shanghai
Prof. Research Institute of Applied Mechanics Taiyuan University of Technology Taiyuan 《中国海洋工程》1996,(2)
- The shear failure of a rigid-plastic dented clamped tubular beam under the lateral impact of a mass is investigated. Both the denting and the impact point are in the middle span of the beam. It is assumed that denting does not spread during the shear sliding. Numerical results show that the axial force and lateral deflection of the beam are very small at the moment of the occurence of shear failure, which means that the finite deformation effect can be neglected in the shear failure analysis. Also, some aspects of the initial impact energy are investigated. 相似文献
132.
本文根据CTD观测资料,分析了研究海区的温、盐、密度跃层的分布与变化,讨论了逆温逆盐层的分布区域,并从跃层角度出发,分析了深层水的涌升,黄海冷水团的上边界以及台湾暖流在东海北部的影响范围。 相似文献
133.
Tan Jiahua Ma Wei Pan Bin Associate Professor Shanghai Jiao Tong University Shanghai Lecturer shanghai Jiao Tong University Shanghai 《中国海洋工程》1992,(1)
The basis, process and results of the demonstration of the main dimensions of a 75000t floating production and storage vessel are discussed in this paper. A simple but reliable orthogonal design method is applied in the main dimension optimization. The ideas of gradual approximation and feedback from various aspects are put into effect. During the demonstration, in order to make the model tally with the actual situation, the draft design is closely related to the computational analysis, so that the demonstration model can be verified at any time; the handling of the overall system is closely related to the research of each item, which is beneficial not only to the mastery of various regularities, but also to the balance of decisions. Finally, according to the computational results and the regularities obtained from analysis, the main dimensions are determined. 相似文献
134.
Lian Gan Ni Kan Hu Kai Guo Dawei . Professor Senior Engineer Marine Design & Research Institute of China Shanghai
. Senior Engineer Marine Design & REsearch Institute of China Shanghai
. Engineer Marine Design & Research Institute of China Shanghai 《中国海洋工程》1992,(4)
This paper describes the study of a single-column structure used as well-head platform. In order to check the reliability of computation theory and programme, model tests have been carried out. The paper introduces the conclusion of tests and the dynamic properties of single-column platform are obtained. 相似文献
135.
In this paper, the calculating charts and formulae about wave pressure on the breast wall are derived with seven parameters on the basis of physical model study. The verification shows that the charts agree with the example, and are adopted in the Specifications of Fishery Harbours Breakwater by the Ministry of Agricultures. 相似文献
136.
中国对虾体内20-羟基蜕皮酮含量与生长和性腺发育的关系 总被引:3,自引:0,他引:3
应用放射免疫分析法对完成变态后的中国对虾(Penaeus orientalis)体内20-羟基蜕皮酮(20-HE)含量进行了周年测定。5~6月,全虾抽提液中20-HE的质量分数以体长为0.8cm的仔虾为最高(47.96±3.94)×10~(-9)(m/m)。血淋巴中20-HE的质量浓度在6~8月(平均为22.66ng/mL)和11月(25.93±3.44ng/mL)较高,翌年3月最低,为8.29±1.40ng/mL。呈现出20-HE含量与蜕皮生长和促进卵母细胞早期发育及精子发生有关。 相似文献
137.
Chen Tieyun Zhu Zhenghong
Professor Dept. of Naval Architecture Ocean Engineering Shanghai Jiao Tong University Shanghai Lecturer 《中国海洋工程》1991,(1)
The plastic node method is reformulated by the variational principle and is applied to elasto-plastic finite element analysis of tubular joints, eventually including the effect of internal and external gussets, stiffener rings, etc., if necessary. Four different joints are studied here in detail for the elasto-plastic behavior, the strain at the hot spot, the strain concentration factor around the intersection line, and the propagation of the plastic region with loading up to collapse in order to determine the ultimate strength, safety factor, and development of the plastic field. The present results are in good agreement with the experimental results. 相似文献
138.
Wave-Current Forces on Slender Circular Cylinders 总被引:3,自引:0,他引:3
Li Yucheng Wang Fenglong Kang Haigui Professor Dalian University of Technology Dalian Senior Engineer Dalian University of Technology Dalian Lecturer Dalian University of Technology Dalian 《中国海洋工程》1991,(3)
- A series model tests of wave forces by both regular and irregular waves combined with currents on single piles and bipiles in tandem and parallel arrays have been carried out. Based on Morison Equation, linear wave theory and linear wave spectrum theory as well, the characteristics of inline, lift and resultant forces on cylinders have been analyzed respectively. The drag, inertia and lift coefficients CD, CM and CL f皉 single piles related to KC number and the grouping effect coefficients of inline, lift and resultant forces on bipiles in tandem and parallel arrays related to KC number are given in this paper. 相似文献
139.
Yu Yuxiu Liu Shuxue Li Li Professor Dept. of Civil Engineering Dalian University of Technology Dalian
Research Assistant Dept. of Civil Engineering Dalian University of Technology Dalian 《中国海洋工程》1991,(3)
Multi-directional irregular waves are simulated on the basis of the given directional spectrum using a double summation model, a single direction per frequency model and a single summation model. Their results are compared. It is shown that the single direction per frequency model proposed in this paper can generate a realistic wave field. The effects of the model parameters on the simulated results are also studied in this paper and corresponding suggestions are given. 相似文献
140.
不同pH海水和不同时间处理紫菜、石莼对呼吸强度和致死酸度试验结果表明,紫菜比石莼耐酸力强。在海水温度为18℃条件下,分别用pH_2、pH_3、pH_4、pH_5、pH_6、pH_7、pH_8处理,处理时间20分钟,紫菜除pH_2处理对呼吸强度有抑制作用和培养5天后有20%死亡外,pH_3、pH_4、pH_5、pH_6、pH_7、pH_8各组处理对呼吸强度都有促进作用,培养5天后没有死亡现象,而石莼经pH_2、pH_3处理,对呼吸强度都有抑制作用,培养5天后,pH_2处理组全部死亡,pH_3处理有50%死亡。pH_3和pH_4在海水温度为18℃条件下,处理时间为40分钟时,对紫菜呼吸强度有促进作用,培养5天报,pH_3处理组仅有20%死亡。而pH_3对石莼呼吸强度有抑制作用,培养5天后,全部灭亡。在生产上是否可以考虑用pH_3的海水处理紫菜网帘以达到消除石莼(杂藻)的目的,将是一项具有生产意义的待试验课题。 相似文献