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本文介绍一致空间的理想导集映射,并对这些映射的像展开研究.同时,介绍I-Hurewicz有界性的概念,研究I-Hurewicz有界性的基础拓扑运算性质.最后,得到一致空间中I-Hurewicz有界性的一个等价刻画. 相似文献
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This paper presents a scheme for realizing the frequency
up-conversion between two collective atomic modes. In the scheme two
atomic samples are coupled to a cavity mode. Under the large
detuning condition, the two collective atomic modes are coupled via
the virtual excitation of the cavity mode and the effective
Hamiltonian corresponds to the frequency up-conversion. In the
scheme the cavity mode is only virtually excited and thus the
process is insensitive to cavity decay. 相似文献
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A scheme is presented for generating entangled states of multiple
atoms in a cavity. In the scheme the atoms simultaneously interact
with a cavity mode, with the first atom driven by two classical
fields and the other atoms driven by a classical field. Our scheme
is valid even if the cavity decay rate is larger than the effective
coupling strength, which is important for experiment. The generation
of entangled states is conditional on the detection of a photon
decaying from the cavity and thus the fidelity of the entangled
state is insensitive to the detection inefficiency. Furthermore, the
scheme can be applied to the case with any number of atoms in
principle. 相似文献
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空气隙膜蒸馏系统热容腔内料液的流动状态直接影响到温度和浓度边界层效应,决定系统的膜通量。本文采用三根沿圆周平均分布的入流管,喷管是鸭嘴形,应用PIV系统测试膜面附近流动状态。在5种喷管中心线与热容腔径向夹角β和3种喷管前端和膜面间距离δ下,测试得到膜面附近的速度场数据,并计算得到涡量场信息。结果表明,所研究的膜组件结构参数β和δ对热容腔内料液的流动状态影响很大,适当的热容腔结构参数可以有效地改善温度极化边界层和浓度极化边界层的影响,增大膜通量。研究结果为空气隙膜蒸馏系统热容腔入流装置的优化设计提供了实验数据和研究经验。 相似文献
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数学与文学同宗同源.数学与文学属于在巫术文化主导下内容耦合.耦合的机理:一是具有学科关联性基础,二是原始先民认识自然征服自然需求力拉动,三是社会分工,通晓天文地理的专职机构、专门人员出现推动.数学与文学的耦合作用是中国文学生成的主要因素.数学对文学的耦合作用促进了文学形式文本固化,增加了最早文学形式文本的时空含量,使语言表达生动,有了境界,有了想象. 相似文献