共查询到20条相似文献，搜索用时 62 毫秒
1.
孟振庭 《渭南师范学院学报》2002,(Z1)
针对屏幕玻璃 (如仪器屏幕玻璃 ,汽车风挡玻璃 ,展览橱窗玻璃 ,高层宾馆幕墙玻璃等 )的洁净除尘具体问题 ,运用超声空化清洗的基本原理 ,提出屏幕玻璃超声洁净处理的基本思路、机制和研究的技术路线。 相似文献
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基于圆柱形反应器声场中特定位置处的空化噪声谱图和空化泡振动理论,提出了一种计算声场中空化泡大小及数量分布的方法。 相似文献
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本文将声空化的近期实验研究归结为声空化的快速摄影和全息化、低温液体的声空化,声化学和医学超声空化四个主要方面,着重阐明了它们的研究进展和应用前景。 相似文献
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超声清洗的原理及最新进展 总被引：11，自引：0，他引：11
本文介绍了功率超声技术的一种重要应用一超声清洗的特点、原理、设备和影响清洗效果的主要因素。在此基础上，介绍了这项技术的最新进展情况。 相似文献
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超声空化对喇曼光谱退偏度影响的微观解释 总被引：1，自引：0，他引：1
本文从物质微观角度出发 ,分析了超声空化造成喇曼光谱退偏度减小的原因 .指出超声空化造成分子振动的振幅增大 ,分子极化率椭球向圆球体过渡 相似文献
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超声协同-钛铁双阳极电化学处理印染废水的研究 总被引：8，自引：1，他引：8
采用超声电化学联用技术，探索超声协同-钛铁双阳极电解体系降解印染废水。该系统集超声空化、阳极催化氧化、电生自由基氧化和电絮凝等组合物化技术于一体，降解含有碱性湖蓝-5B的印染废水。研究结果表明：对COD为5342．4mgL^-1的含碱性湖蓝-5B的印染废水的COD去除率达到90．2％，脱色率达到98．3％。 相似文献
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本文研究了不同物体反射时的声致荧光影像,由此进一步分析了超声空化场的反射传输特点. 相似文献
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本文阐述了功率超声流体动力法、压电效应法以及磁致伸缩效应法的三种产生方法,重点介绍了功率超声的有关应用,包括超声化学、医学超声、超声清洗、超声加工技术、超声悬浮等,并指出了功率超声在今后的研究趋势。 相似文献
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探讨了超声波清洗空化噪声对小鼠旷场行为的影响。将72只小鼠按所接触噪声的频率随机分为21.1kHz组、26.9kHz组和37.7 kHz组,各组又设对照组和实验组。将三个实验组对应暴露于工作频率分别为21.1kHz、26.9kHz和37.7 kHz的超声波清洗机辐射出的空化噪声环境中,每天8h,共20d。采用旷场分析法,观察小鼠的各行为指标。结果显示,超声波清洗空化噪声暴露对小鼠的行为功能有负面影响,在保持噪声强度相同的情况下,超声波清洗机的工作频率越高其产生的超声波清洗空化噪声对小鼠的行为功能造成的损害越严重。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献