共查询到20条相似文献，搜索用时 62 毫秒
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李英 《商洛师范专科学校学报》2005,19(2):27-30
构造了多模偶相干态的一般形式；由距离函数的的定义，得到了不同的多模偶相干态之间的距离函数De(rj，rj′)可分辨性．依据距离函数Do(rj，rj′)和De(rj，rj′)，讨论了两个不同的多模偶相干态的可分辨性与其内禀参数之间的关系． 相似文献
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根据Ludwigknoll等人对两个量子态之间的距离函数的定义,得到了两个任意多模相干态意多模相干态｜狖Zj狚〉q和｜狖Z'j狚〉q之间的距离D(rj,rj',θ),依据D(rj,rj',θ)详细讨论了｜狖Zj狚〉q和｜狖Z'j狚〉q之间的相仿程度与其内禀参数之间的关系,结果发现态｜狖Zj狚〉q和｜狖Z'j狚〉q之间的相似程度不但与线个多模相干态各模在复空间由基态平移的距离有关系,而且与每个相干态相对初始相位差θ相关,在每个平移距离很小时D(rj,rj',θ)随着θ的变化呈现周期性变化. 相似文献
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根据Ludwig Knoll等人对两个量子态之间的距离函数的定义,得到了多模真空态与多模相干态之间距离函数的一般表达式D(r_j)。依据距离函数D(r_j)讨论了多模真空态和多模相干态之间可分辨性与它们的内禀参数之间的关系,从理论上证明了多模真空态和多模相干态的宏观可分辨性。 相似文献
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李英 《商洛师范专科学校学报》2003,17(3):72-74
根据Ludwig Knoe11等人对两个量子态之间的距离函数的定义，得到了多模真空态与多模相干态之间距离函数的一般表达式D(Tj)依据距离函数D（Tj）讨论了多模真空态和多模相干态之间可分辨性与它们的内禀参数之间的关系，从理论上证明了多模真空态和多模相干态的宏观可分辨性。 相似文献
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根据量子力学中的线性叠加原理,用多模虚奇相干态和多模复共轭偶相干态组成了特殊的四态叠加多模叠加态光场 ,运用多模压缩态理论得到了的等N次幂Y压缩的一般理论结果,通过对这一理论结果的数值分析发现:当压缩幂次N,腔模总数q,各模相干态的平均光子数Rj2,以及奇相干态和多模复共轭偶相干态叠加几率幅的模r0、re等参量的取值满足一定的条件时态 可呈现:a.等幂次N-Y最小测不准态;b.“半相干态效应”;c.半压缩效应;d.第一正交分量呈现等N次幂Y压缩或第二正交分量呈现等N次幂Y压缩. 相似文献
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根据多模辐射场的广义非线性等阶高阶压缩理论 ,对由一个多模奇相干态与一个多模偶相干态光场组成的四态叠加多模叠加态光场 |Ψ (4)o,e, 〉q 的等价 N次方 Y压缩特性进行了详细研究 .结果表明 :1)当压缩阶数 N为偶数时 ,态 |Ψ (4)o,e, 〉q恒处于等阶 N— Y最小测不准态 ;2 )当 N为奇数时 ,态 |Ψ (4)o,e, 〉q 在一定条件下呈现等阶 N次方 Y压缩、“半相干态”、“半相干—半压缩”及“完全等阶 N次方 Y压缩”效应 . 相似文献
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利用多模压缩态理论，研究了在Kerr介质中自相位调制对多模偶相干态等幂次N次方Y压缩特性的影响，结果发现：1)当压缩阶数N为偶数时，多模Kerr偶相干态在一定的条件下总可随时间变化而周期性地处于等幂次N—Y最小测不准态；2)当压缩阶数贝为奇数时，多模Kerr偶相干态在一定的条件下总可随时间变化而周期性地呈现等幂次N次方Y压缩效应。 相似文献
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王菊霞 《渭南师范学院学报》2004,19(5):3-6
利用多模压缩态理论进一步研究了多模复共轭奇、偶相干态光场的广义非线性等幂次高次差压缩特性.分析表明:只要至少有一个模的光子数nj(j=1,2,3,…,2q)小于压缩次数N,则无论腔模数q与压缩次数N之积q·N取奇数还是取偶数,多模复共轭奇、偶相干态光场的广义磁场、广义电场两个正交相位分量均可同时呈现出差压缩效应,这种现象称之为广义非线性等幂次"N次方X奇异压缩"效应,此结果与现有报道截然不同,使"测不准关系"受到破坏;同时说明多模复共轭奇、偶相干态光场确实是两种典型的多模非经典光场. 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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《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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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
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献