全文获取类型
收费全文 | 2203篇 |
免费 | 127篇 |
国内免费 | 61篇 |
专业分类
电工技术 | 62篇 |
综合类 | 119篇 |
化学工业 | 705篇 |
金属工艺 | 47篇 |
机械仪表 | 74篇 |
建筑科学 | 64篇 |
矿业工程 | 183篇 |
能源动力 | 51篇 |
轻工业 | 496篇 |
水利工程 | 18篇 |
石油天然气 | 220篇 |
武器工业 | 4篇 |
无线电 | 29篇 |
一般工业技术 | 77篇 |
冶金工业 | 204篇 |
原子能技术 | 7篇 |
自动化技术 | 31篇 |
出版年
2024年 | 4篇 |
2023年 | 15篇 |
2022年 | 36篇 |
2021年 | 71篇 |
2020年 | 48篇 |
2019年 | 43篇 |
2018年 | 35篇 |
2017年 | 54篇 |
2016年 | 55篇 |
2015年 | 56篇 |
2014年 | 149篇 |
2013年 | 122篇 |
2012年 | 191篇 |
2011年 | 142篇 |
2010年 | 123篇 |
2009年 | 123篇 |
2008年 | 92篇 |
2007年 | 152篇 |
2006年 | 144篇 |
2005年 | 124篇 |
2004年 | 87篇 |
2003年 | 83篇 |
2002年 | 92篇 |
2001年 | 89篇 |
2000年 | 58篇 |
1999年 | 53篇 |
1998年 | 46篇 |
1997年 | 38篇 |
1996年 | 17篇 |
1995年 | 13篇 |
1994年 | 13篇 |
1993年 | 5篇 |
1992年 | 7篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1982年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有2391条查询结果,搜索用时 15 毫秒
991.
介绍了中国石油庆阳石化分公司60万t/a催化重整装置再生碱液单元的运行情况,分析了该单元易发生堵塞的原因,并考察了在不停工情况下烟气反吹、蒸汽吹扫、水洗等方法对堵塞的处理效果.结果表明,再生烟气中的HCl,CO2等酸性气与碱反应生成NaCl,Na2CO3等可溶性盐,易造成冷却器、混合器等设备发生堵塞现象,致使碱液循环量、碱洗罐压力、再生烟气循环量等3个关键工艺参数持续下降;选取水洗法进行处理,即控制碱洗罐的碱液液位从正常工况的45%降低为10%,然后补充大量脱盐水,将碱液液位补充至45%,对碱液混合器及冷却器进行冲洗,可使工艺参数在1.5h后恢复正常. 相似文献
992.
《分离科学与技术》2012,47(10):2267-2282
Abstract This paper describes laboratory‐scale testing conducted to evaluate Selective Dissolution of cesium from non‐radioactive Hanford tank 241‐S‐112 salt cake simulant containing the primary chemicals found in the actual tank. A modified axial dispersion model with increasing axial dispersion was developed to predict cesium removal. The model recognizes that water dissolves the salt cake during washing, which causes an increase in the axial dispersion during the wash. This model was subsequently compared with on‐line cesium measurements from the retrieval of tank 241‐S‐112. The model had remarkably good agreement with both the lab‐scale and full‐scale data. 相似文献
993.
《分离科学与技术》2012,47(1):46-53
In a wide range of industrial applications particle design is governed by the process precipitation followed by isolation like filtration or washing and drying. Particle characteristics play a crucial role on the behavior of the suspension during all production steps. This especially counts for pigments or dye stuff as well as for life science products. Particularly in the pharmaceutical industry bioavailability of a product is of utmost importance, which is often improved by designing colloidal particle collectives with a high surface area, however, often compromising the solid-liquid separation efficiency. This study is concerned with the interaction between crystallization, sedimentation, and washing efficiency all impacted by physical chemical properties of the particles itself, but also on the liquid phases used. The effect of dosage time of the reactants, stirrer speed, ionic strength, and pH-value are investigated in the precipitation process and on their impact on the solid-liquid separation behavior. 相似文献
994.
995.
介绍了马钢新区煤气净化工艺,分析了焦炉煤气脱萘过程中遇到的问题,提出了改进措施,取得了较好的脱萘效果。 相似文献
996.
997.
在洗衣机盛水桶模具常规水冷的基础上增加型腔局部表面压缩空气气吹冷却 ,冷却时间从原来的50s降至40s ,同时开闭模动作的时间也可下降5s ,成型周期缩短了16 % ,投入批量生产后产生了较好的经济效益 相似文献
998.
对汽轮发电机组大修后两阶段油循环模式的工艺方案进行了详细阐述,并与常规油循环模式进行了比较分析。汽轮发电机组大修后两阶段油循环模式与常规油循环模式相比,两阶段油循环模式方案简单可行,既可提高油循环冲洗效果,又能缩短油循环冲洗时间,保证了检修工期。 相似文献
999.
A pressure-washing system was developed and assessed for the removal of residual dyes and washing of fabrics. The system was comprised of an acrylic water-tank, ultra-high molecular weight polyethylene rollers, a variable water pressure system rated at 1000 psi and a set of four linear spray nozzles with various exit divergence angles. To further decrease the water consumption, heated aerated impinging jets were added to the setup. Two cameras and 3D image processing algorithms were used to monitor fabric deformation during the washing process. Results show that increasing the water pressure up to 150 psi reduced the amount of water needed and did not cause fabric distortion. A small inclination angle of 20 degrees in the direction opposite to the flow of the fabric added some efficiency to the washing process. Although temperature alone did not exhibit a strong impact on efficiency, aerated-jet experiments under a water pressure of 100 psi at 60°C showed an increase of washing efficiency over non-aerated jets. 相似文献
1000.