首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   65篇
  国内免费   1篇
  完全免费   8篇
  物理学   74篇
  2014年   2篇
  2013年   1篇
  2012年   10篇
  2011年   1篇
  2010年   6篇
  2009年   5篇
  2008年   7篇
  2007年   2篇
  2006年   2篇
  2005年   1篇
  2004年   4篇
  2003年   3篇
  2002年   3篇
  2001年   2篇
  2000年   5篇
  1999年   3篇
  1998年   1篇
  1997年   1篇
  1996年   4篇
  1995年   2篇
  1994年   5篇
  1993年   3篇
  1992年   1篇
排序方式: 共有74条查询结果,搜索用时 62 毫秒
1.
The uses of ultrasound in food technology   总被引:19,自引:0,他引:19  
The same physical and mechanical effects which have been utilised in sonochemistry, i.e. strong shear forces, particle fragmentation, increased mass and heat transfer, nucleation of seedling, have been applied to food processing. Examples are quoted from various applications where power ultrasound has been used to influence the development of living cells, improve sterilisation and effect enzyme activity. Typically ultrasound can be used as a processing aid in extraction, crystallisation, freezing, emulsification, filtration and drying.  相似文献
2.
超声波在催化过程中的应用   总被引:16,自引:0,他引:16       下载免费PDF全文
简述了声化学效应的作用机理,并综述了超声在催化反应、催化剂的制备及再生过程中的应用。  相似文献
3.
Ultrasonic decompositions of chlorobenzene (ClBz), 1,4-dichlorobenzene and 1-chloronaphthalene were investigated at 500 kHz in order to gain insight into the kinetics and mechanisms of the decomposition process. The disappearance of ClBz on sonication is almost simultaneously accompanied by the release of chloride ions as a result of the rapid cleavage of carbon–chlorine bonds with a concomitant release of CO, C2H2, CH4 and CO2. The intermediates resulting from attack of HO radicals were detected but in a quite low yield (less than 2 μM). The generation of H2O2 on sonolysis is not significantly affected by the presence of aqueous ClBz while the generation of NO2 and NO3 is inhibited initially due to the presence of ClBz which diffuses into the gas–bubble interfaces and inhibits the interactions between free radicals and nitrogen. Moreover, brown carbonaceous particles are present throughout the ultrasonic irradiation process, which are consistent with soot formation under pyrolytic conditions. These important features suggest that, at the relatively high initial substrate concentrations used in this study, ultrasonic degradation of ClBz takes place predominantly both within the bubbles and within the liquid–gas interfaces of bubbles where it undergoes high-temperature combustion. Under these conditions, the oxidation of ClBz by free radical HO outside of bubbles is a minor factor (though results of recent studies suggest that attack by HO is more important at lower initial substrate concentrations). The sonochemical decomposition of volatiles follows pseudo-first-order reaction kinetics but the degradation rates are affected by operating conditions, particularly initial substrate concentration and ultrasonic intensity.  相似文献
4.
超声空化与超声医学   总被引:13,自引:0,他引:13       下载免费PDF全文
冯若  李化茂 《应用声学》2000,19(1):35-38
随着超声技术应用广泛而迅速的发展,整整一个世纪来,超声空化成了经久不衰的研究课题,特别近10年来,超声空化成了多种学科的基础研究热点。本扼要地介绍了起声空化的最新研究进展,以及超声空化与超声医学发展的密切关系。  相似文献
5.
灭多威的超声降解研究   总被引:12,自引:0,他引:12       下载免费PDF全文
研究了灭多威模拟废水在超声作用下的降解反应动力学、降解产物、降解途径、以及影响降解速率的因素等问题.结果表明,灭多威经超声作用35min,可被完全转换为无机物,其降解过程为假一级反应;浓度增加时,降解减慢;Fe  相似文献
6.
声化学新发展——纳米材料的超声制备   总被引:11,自引:0,他引:11  
张颖  林书玉  房喻 《物理》2002,31(2):80-83
声空化所引发的特殊的物理,化学环境为制备具有特殊性能的新型材料提供了一条重要的途径,近年来,声化学处理已成为制备纳米材料的一种十分有效的技术,文章综合介绍了超声法制备纳米材料的主要类型,其中包括超声声解法,声化学还原法,超声共沉淀法,超声微乳液法等,并着重阐述了超声的作用原理和各种方法的特点。  相似文献
7.
Large scale sonochemical processing: aspiration and actuality   总被引:6,自引:0,他引:6  
It has been recognised for many years that power ultrasound has great potential in a wide variety of processes in the chemical and allied industries. Some of these processes have been known for many years and continue to flourish as major commercial applications, e.g. plastic welding and cleaning. Others, like ultrasonic drilling, while showing great potential have not been widely exploited to date. The potential for the industrial use of power ultrasound is enormous, and yet industry seems somewhat reluctant to adopt it. In this article the existing uses of power ultrasound in processing are reviewed and the potentials are explored.  相似文献
8.
水处理用声化学反应器研究进展   总被引:6,自引:1,他引:5       下载免费PDF全文
介绍了在水处理中采用的液哨式、清洗槽式、变幅杆式、杯式、平行板、管型等声化学反应器的研究进展和应用现状。指出要在实际水处理工程中采用超声技术,必须尽快开展高效、大批量处理或流水式连续运行的声学反应器的基础研究与应用开发。  相似文献
9.
Sonochemical production of intermetallic coatings in heterogeneous media   总被引:5,自引:0,他引:5  
The production of 5–10 μm fused particles and agglomerates occurs when metal powders in hydrocarbon solvents are exposed to high-intensity ultrasound. The principle mechanism of particle fusion is believed to be interparticle collision caused by the rapid movement of particles propelled by shock waves generated at cavitation sites. An energy-dispersive X-ray (EDX) study of the agglomerates produced during the sonication of mixed-metal powders in decane indicates that not only are the metal particles fused by the action of ultrasound but that intermetallic coatings are also developed. By examination of mixed-metal systems (Ni/Co and Cu/Mo) with substantially different tribological characteristics, it has been determined that the coatings are generated by both adhesive wear and direct impact. The mechanisms of ultrasound-induced coatings are discussed.  相似文献
10.
超声/PFS联合对造纸黑液处理的研究   总被引:4,自引:0,他引:4       下载免费PDF全文
对苇浆黑液进行超声与PFS/H2O2的协同预处理研究。结果表明:它们的联合处理与单独用PFS/H2O2处理相比较。CODcr的去除率提高12.49%-14.41%;可节约PFS14%,H2O250%-80%;实验也表明,处理效果与探头的辐射面积关系不大,同时一味增加电功率,效果也不明显,由此推断,这与黑液成分复杂有关。  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号