全文获取类型
收费全文 | 22969篇 |
免费 | 1785篇 |
国内免费 | 1735篇 |
学科分类
工业技术 | 26489篇 |
出版年
2024年 | 29篇 |
2023年 | 235篇 |
2022年 | 447篇 |
2021年 | 606篇 |
2020年 | 664篇 |
2019年 | 685篇 |
2018年 | 619篇 |
2017年 | 674篇 |
2016年 | 838篇 |
2015年 | 701篇 |
2014年 | 1231篇 |
2013年 | 1864篇 |
2012年 | 1405篇 |
2011年 | 1587篇 |
2010年 | 1287篇 |
2009年 | 1340篇 |
2008年 | 1213篇 |
2007年 | 1347篇 |
2006年 | 1280篇 |
2005年 | 1160篇 |
2004年 | 1021篇 |
2003年 | 1062篇 |
2002年 | 843篇 |
2001年 | 787篇 |
2000年 | 628篇 |
1999年 | 563篇 |
1998年 | 438篇 |
1997年 | 352篇 |
1996年 | 298篇 |
1995年 | 241篇 |
1994年 | 177篇 |
1993年 | 161篇 |
1992年 | 138篇 |
1991年 | 129篇 |
1990年 | 102篇 |
1989年 | 67篇 |
1988年 | 42篇 |
1987年 | 56篇 |
1986年 | 31篇 |
1985年 | 37篇 |
1984年 | 24篇 |
1983年 | 14篇 |
1982年 | 8篇 |
1981年 | 6篇 |
1980年 | 5篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1959年 | 32篇 |
1951年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
哈尔滨炼油厂MTBE装置试生产 总被引:4,自引:0,他引:4
介绍了哈尔滨炼油厂MTBE装置的工艺路线、新技术的应用及特点;催化剂的装填及应用情况;总结了生产过程中遇到的一系列问题及解决办法;探索了平稳生产的新徐径,以保证装置安全、平稳、长周期运行;同时对反应器操作温度、催化蒸馏塔操作压力、原料中醇烯比等因素对异丁烯转化率及MTBE产品的影响做了简单的总结。 相似文献
82.
对直径280mm、扩大直径500mm、外循环管直径65mm、总高2900mm的外循环型鼓泡式反应器,在气体空塔线速Ug为0.04-0.55m/s时,用静压差法和脉冲示踪法测定了不同部位的气含率Eg,Epg和循环液速率u1,并获得了它们的关联式:对反应段,Eg=0.4556U^0.3198g〔Ug/(Ug+U1)〕^0.7396;对反应器扩大段,Eug=0.9389U^0.4431ug;对循环管,E 相似文献
83.
M. Aigner M. Zeilinger H. Hofbauer 《Chemical Engineering and Processing: Process Intensification》1995,34(6):515-520
The hydrolysis of isocyanic acid in the gaseous phase has been investigated at temperatures between 553 and 613 K by mass spectrometry and evaluated to obtain the corresponding kinetic data. The reaction order and reaction constant have been determined. Finally, the influence of water on the catalysed formation of melamine from isocyanic acid under the operating conditions employed has been investigated in order to determine whether there is a need to try the process gas. 相似文献
84.
乙烯氧化制环氧乙烷固定床反应器的模拟及稳定性分析 总被引:2,自引:0,他引:2
在筛选出合适的乙烯氧化制环氧乙烷动力学方程的基础上,对工业固定床氧化反应器进行一维和二维模型的模拟计算。考察操作工艺参数对反应器稳定性、转化率影响的敏感性以及N_2和CH_4做致稳气时反应温度和转化率的轴向、径向分布。 相似文献
85.
86.
Selectivity of partial hydrogenation reactions performed in a pore-through-flow catalytic membrane reactor 总被引:2,自引:0,他引:2
The selectivity of partial hydrogenation reactions of unsaturated substrates was studied in a membrane reactor operating at 323 K and 40 bar hydrogen pressure. The reactor system was constructed as a loop of a saturation vessel and a membrane module in which the reaction mixture was resaturated with hydrogen up to 100 times. In a porous membrane made from cross-linked polyacrylic acid palladium nanoparticles were incorporated as catalysts. A well-defined residence time within the membrane was achieved due to a defined pore structure of the membrane and a convective mass flow of the reaction mixture through the membrane. The selectivity for the partially hydrogenated products was investigated as a function of the pore size of the PAA membrane and was compared to commercially available catalysts. Compared to experiments with supported catalysts (Pd/C and Pd/Al2O3) in a slurry and a fixed bed reactor the selectivity for the desired products could be increased by 3% (1-octyne) up to 40% (geraniol). 相似文献
87.
Study of direct and indirect naphtha recycling to a resid FCC unit for maximum propylene production 总被引:2,自引:0,他引:2
To satisfy the increasing propylene demand, direct and indirect naphtha recycling schemes around an existing resid fluid catalytic cracking (FCC) unit were investigated. To this aim, light cracked naphtha (LCN), heavy cracked naphtha (HCN) and a PolyNaphtha (PN) oligomerisation product were cracked under a wide range of operating conditions over a commercial Y zeolite based equilibrium catalyst. Experimental data were acquired in three different units: a fixed bed bench scale unit, a fixed fluidised bed unit and an adiabatic circulating fluidised bed pilot plant. It was shown that FCC naphthas require high operating severities to crack, and that even then their conversion remains relatively moderate. Hence, direct recycling to the main riser does not seem a viable pathway to increase propylene product. Feeding FCC naphthas to a second reaction zone operating at high severity allows to increase the propylene yield in a significant manner. Increasing conversion, however, not only leads to higher LPG and propylene yields, but also results in very high dry gas yields. An alternative scheme was proposed, in which the olefinic C4 and C5 fractions are converted into a naphtha fraction through oligomerisation in a dedicated unit before being recracked in the secondary riser. As the highly olefinic oligomerised effluent mainly consist of dimerised and trimerised butenes and pentenes, this feed is more easily cracked and high conversions can be achieved. This indirect interconversion of butenes and pentenes into propylene therefore effectively allows to convert these butenes and pentenes into propylene, resulting in a significant increase in propylene yield. Each of the three main naphtha recycle options (directly to the main riser, directly to a secondary riser or indirectly via a light olefin oligomerisation unit) have been analysed and compared to a base case. In the evaluation of each of these schemes, all heat balance effects, both on the riser and the regenerator side, have been accounted for. The proposed process scheme with an indirect recycle via an oligomerisation unit enhances the already inherent flexibility of the FCC unit. The naphtha recycle can be turned on or off, the second reaction zone can be used to crack naphtha or to crack resid feed to maximise throughput, while the effluent of the oligomerisation unit can be recycled to the FCC unit for propylene production or hydrogenated and sent to gasoline and kerosene pool. 相似文献
88.
介绍了在高压环形反应器上采用连续聚合工艺进行的VAE(醋酸乙烯-乙烯共聚物)乳液新品种的开发。通过在普通型VAE乳液配方基础上调整保护胶体的品种和用量,并采用新型氧化-还原引发体系,生产出高固含(6S%)低粘度的VAE乳液,具有优异的粘接强度和干燥速度。用于包装行业的快速粘接和配制成木材拼板胶,效果优异。 相似文献
89.
A newly developed catalyst type DVR-1 for catalytic cracking of Daqing vacuum resid was put into use in a commercial VRFCC unit,This catalyst features uniquely active matrix and modified ultra-stable zeolite.The commercial application results show that the DVR-1 type catalyst has the advantage of high heavy oil conversion,good metal tolerance nd gooed stability for catalyst regeneration,The FCC tests have shown Favorable product distribution,acceptable product quality and enormaous economic benefits whe processing the feedstock containin 75%-100% Daqing VR. 相似文献
90.
西安脉冲反应堆源区测量仪表是源区低端测量的关键仪表,同时也是反应堆堆外中子通量监测仪表系统的重要组成部分,该仪表在同类型反应堆仪表的基础上进行了研制改进和更新,使仪表在测量灵敏度、测量范围、抗干扰能力、可靠性及可维修性等主要性能指标方面有了较大提高。简要介绍了该仪表的设计思想、构成、工作原理、主要技术指标、应用效果及特点等。 相似文献