全文获取类型
收费全文 | 53545篇 |
免费 | 4800篇 |
国内免费 | 2839篇 |
专业分类
电工技术 | 3027篇 |
综合类 | 4130篇 |
化学工业 | 9511篇 |
金属工艺 | 9027篇 |
机械仪表 | 2572篇 |
建筑科学 | 8474篇 |
矿业工程 | 1651篇 |
能源动力 | 1589篇 |
轻工业 | 2534篇 |
水利工程 | 1635篇 |
石油天然气 | 1654篇 |
武器工业 | 384篇 |
无线电 | 2308篇 |
一般工业技术 | 8438篇 |
冶金工业 | 2922篇 |
原子能技术 | 319篇 |
自动化技术 | 1009篇 |
出版年
2024年 | 266篇 |
2023年 | 877篇 |
2022年 | 1788篇 |
2021年 | 1976篇 |
2020年 | 1885篇 |
2019年 | 1516篇 |
2018年 | 1401篇 |
2017年 | 1959篇 |
2016年 | 1874篇 |
2015年 | 1950篇 |
2014年 | 2825篇 |
2013年 | 2802篇 |
2012年 | 3401篇 |
2011年 | 3838篇 |
2010年 | 2827篇 |
2009年 | 3296篇 |
2008年 | 2824篇 |
2007年 | 3489篇 |
2006年 | 3263篇 |
2005年 | 2802篇 |
2004年 | 2225篇 |
2003年 | 1979篇 |
2002年 | 1711篇 |
2001年 | 1463篇 |
2000年 | 1227篇 |
1999年 | 1043篇 |
1998年 | 854篇 |
1997年 | 769篇 |
1996年 | 552篇 |
1995年 | 541篇 |
1994年 | 440篇 |
1993年 | 301篇 |
1992年 | 270篇 |
1991年 | 214篇 |
1990年 | 171篇 |
1989年 | 159篇 |
1988年 | 96篇 |
1987年 | 59篇 |
1986年 | 35篇 |
1985年 | 26篇 |
1984年 | 41篇 |
1983年 | 34篇 |
1982年 | 37篇 |
1981年 | 12篇 |
1980年 | 16篇 |
1979年 | 16篇 |
1961年 | 2篇 |
1960年 | 3篇 |
1959年 | 6篇 |
1951年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
101.
C R Chakravorty 《Bulletin of Materials Science》1994,17(6):733-745
Magnesium-lithium alloys are among the lowest density metallic materials. Addition of lithium, with a relative density of
0·53, in magnesium reduces the density of the alloy significantly. Furthermore, addition of nearly 11 wt.% lithium converts
hexagonal close packed structure of pure magnesium to a body centered cubic lattice, markedly improving formability of the
alloy. The development of these alloys, however, had been hampered due to the high reactivity of lithium and magnesium in
the molten state and also, due to poor creep resistance and instability of mechanical properties at room temperature. In an
attempt to indigenize these ultra light alloys for possible applications in Indian satellite programme, detailed research
work was initiated in DMRL. The difficulties associated with producing sound cast ingots have been overcome by controlling
melting and casting parameters of these alloys. Extensive work has been done on structure-property correlation of alloys with
varying lithium content and minor alloying additions. Based on these work, advanced magnesium-lithium alloys have been developed
with improved tensile properties, room temperature stability and creep resistance. Wrought products (plates/sheets) of magnesium-lithium
alloy have been supplied to ISAC, Bangalore and are being used in their INSAT-2 programme. This paper describes the systematic
studies carried out in the laboratory to indigenize these ultra light alloys. 相似文献
102.
Fracture toughness and fatigue crack propagation (FCP) of plain and modified anhydride-cured epoxy resin (EP) were studied at ambient temperature. Liquid carboxyl-terminated acrylonitrile-butadiene (CTBN) and silicon (SI) rubber dispersions were used as tougheners for the EP. The morphology of the modified EP was characterized by dynamic mechanical analysis (DMA) and by scanning electron microscopy (SEM). The fracture toughness, Kc, of the compositions decreased with increasing deformation rate. Kc of the EP was slightly improved by CTBN addition and practically unaffected by incorporation of the SI dispersion when tests were performed at low cross-head speed, v. Both modifiers improved Kc at high v, and also the resistance to FCP, by shifting the curves to higher stress intensity factor ranges, ΔK, by comparison with the plain EP. It was established that both fracture and fatigue performance rely on the compliance, JR, at the rubbery plateau, and thus on the apparent molecular mass between crosslinks, Mc. The failure mechanisms were less dependent upon the loading mode (fracture, fatigue), but differed basically for the various modifiers. Rubber-induced cavitation and shear yielding of the EP were dominant for CTBN, whereas crack bifurcation and branching controlled the cracking in SI-modified EP. The simultaneous use of both modifiers resulted in a synergistic effect for both the fracture toughness at high deformation rate and the FCP behavior. 相似文献
103.
从分析某高架桥中异形板板底裂缝的特点及成因着手 ,对设计与施工工艺诸方面提出防止裂缝的对策和对裂缝进行加固的全过程。 相似文献
104.
催化裂化再生系统设备应力腐蚀开裂成因分析及解决对策 总被引:5,自引:0,他引:5
通过对催化裂化装置再生系统设备裂纹断口分析 ,以及对再生烟气的组分、冷凝水酸度及露点等的分析及对设备焊接残余应力测试 ,阐明了设备应力腐蚀开裂发生的原因 ,指出了富氧操作、高露点温度和高应力水平对再生系统设备应力腐蚀的影响作用 ,并重点提出了解决和防止应力腐蚀开裂的一系列有效措施和部分应用情况 相似文献
105.
球磨机衬板材料及热处理工艺 总被引:1,自引:0,他引:1
对传统的中碳低合金耐磨铸钢的化学成分和热处理工艺进行了优化设计 ,使新材料具有较高的强度、硬度和韧性 ,因而抗冲击、抗疲劳、抗磨损性能良好。实际应用表明 ,用此种材料代替油淬和风冷中碳低合金耐磨铸钢 ,不仅生产成本低 ,而且在矿山、电力球磨机制粉等工矿条件下 ,其使用寿命长 相似文献
106.
Birthe Mller Jose Luis Molina‐Cano Lars Munck 《Journal of the Institute of Brewing》2002,108(3):294-302
In earlier studies concerning vigour, where subsamples are heat‐treated before germination there was found heat‐sensitive as well as heat‐resistant barley samples. The vigour model developed by Ellis and Roberts and further developed at Carlsberg, could only describe the heat‐sensitive barleys. Seventeen samples of the “Alexis” variety grown widely in Europe were collected from the EBC trials in 1994 in order to see if heat resistance in barley was influenced by different growing conditions. We found both heat‐sensitive samples following the vigour model as well as pronounced heat‐resistant samples, but these were not divided according to growing conditions. The germination curves dependent on heat treatment and germination time were evaluated by Principal Component Analysis (PCA). Heat‐resistant barley samples could be differentiated from heat‐sensitive samples already after ½ h of heat treatment at 68°C (12% moisture) and after 3 days of germination. The barley samples were analysed with regard to malting quality. The PCA evaluation of the data divided the samples according to growing location, mainly due to differences in protein and β‐glucan. However, the malting analyses could not describe the differences in heat resistance and sensitivity of the barleys. The biochemical background of the heat resistance found is discussed on the basis of literature. Our findings should give an experimental basis for exploiting a biochemical principle for heat resistance, which is formed during grain filling and consumed during storage and germination. 相似文献
107.
108.
文章叙述了新型镍基耐蚀哈氏合金G-30在不同介质中的耐蚀性能以及工业应用,综合分析了该合金应用的经济性及前景。 相似文献
109.
This paper presents observations regarding the cracking behavior of tensile-loaded structural adhesive joints. Experiments showed that fracture occurred by the development and propagation of a damage zone, rather than a single, sharp crack, and that the presence of the adhesive spew fillet did not affect the fracture load of the adhesive joints studied. For joints bonded with the mineral-filled epoxy Cybond 4523GB (American Cyanamid), there was approximately 5 mm of subcritical crack propagation prior to final fracture. Fracture-load predictions based on the initial uncracked geometry made in previous papers were unaffected by this small change in geometry. For joints bonded with the rubber-toughened epoxy Permabond ESP 310, approximately 50 mm of subcritical crack propagation was observed. It was again found that predictions made in previous papers on the basis of the initial geometry gave a good estimate of the final fracture load even though this subcritical crack propagation significantly altered the geometry, and thus the applied energy release rates. The effect of shear deformations of the adherends was also investigated, and it was found that shear deformations could be neglected in engineering calculations for joints subject to remote tensile loading. 相似文献
110.
网带式连续烧结炉炉温及网带速度微机控制系统 总被引:1,自引:0,他引:1
本文介绍一个基于STD总线的单片机网带式连续烧结炉炉温及网带速度控制系统,详细叙述了系统的硬件结构和控制算法。 相似文献