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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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本文介绍了一种新的声致荧光方法及其检测系统,利用这种方法和检测系统获得了米诺－氢氧化钠水溶液的声致荧光光谱,同时探讨了一种增强声致荧光的方法,利用声致荧光我们还记录了容器中超声空化场分布的景像。 相似文献
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鲁米诺声致荧光谱的检测及空化场分布影像 总被引：3，自引：0，他引：3
本文介绍了一种新的声致荧光方法及其检测系统 .利用这种方法和检测系统获得了鲁米诺———氢氧化钠水溶液的声致荧光光谱 ,同时探讨了一种增强声致荧光的方法 .利用声致荧光我们还记录了容器中超声空化场分布的影像 相似文献
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本文提出了利用人体感官直接了解声空化的机械效应、热效应和光效应等物理效应的实验方法,给出了相应的观测结果,并对这种实验方法进行讨论. 相似文献
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《中学物理教学参考》2004,33(5):64-64
早在20世纪30年代，德国科学家发现，当声波穿过液体的时候，如果声音足够强，而且频率也合适，那么会产生一种“声空化”现象——在液体中会产生细小的气泡．气泡随即坍塌为一个非常小的体积，内部的温度超过10万摄氏度，在这过程 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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单泡声致发光研究 总被引：1，自引：0，他引：1
王巧霞 《湖州师范学院学报》2006,28(2):30-32
综述了单气泡声致发光(SBSL)这种新奇的现象.由于SBSL现象在时间和空间的高度重复性,为实验研究气泡的运动特性和影响发光参数(含气量,水温,声压等)提供了可能.介绍了解释声致发光发原因的四种发光机理,并对各自的优缺点进行了分析.展望了单气泡声致发光现象在化学分析,医学检测等多个领域的应用前景. 相似文献
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用碘释放法研究三维正交超声辐照的空化产率的增强效应 总被引：4，自引：0，他引：4
首次用碘释放法研究了三维正交超声辐照的空化产率,结果表明三维正交辐照较之二和一维辐照有更为显著的增强效应。 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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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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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 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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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献