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121.
A general scheme of generating NOON states of virtually-excited 2N atoms is proposed. The two cavities are fibre-connected with N atoms in each cavity. Although we focus on the case of N = 2, the system can be extended to a few atoms with N 〉2. It is found that all 2N atoms can be entangled in the form of NOON states if the atoms in the first cavity are initially in the excited states and atoms in the second cavity are all in the ground states. The feasibility of the scheme is carefully discussed, it shows that the NOON state with a few atoms can be generated with good fidelity and the scheme is feasible in experiment. 相似文献
122.
A general scheme of generating N00N states of virtually-excited 2N atoms is proposed. The two cavities are fibre-connected with N atoms in each cavity. Although we focus on the case of N=2, the system can be extended to a few atoms with N>2. It is found that all 2N atoms can be entangled in the form of N00N states if the atoms in the first cavity are initially in the excited states and atoms in the second cavity are all in the ground states. The feasibility of the scheme is carefully discussed, it shows that the N00N state with a few atoms can be generated with good fidelity and the scheme is feasible in experiment. 相似文献
123.
P.V. DhanarajN.P. Rajesh 《Physica B: Condensed Matter》2011,406(1):12-18
A systematic characterization of a novel nonlinear optical material tris (glycine) calcium(ΙΙ) dichloride (TGCC) is performed. The solubility and metastable zone width of TGCC were studied. TGCC single crystal of dimensions 34×23×5 mm3 was grown by the slow evaporation technique. Single crystal X-ray diffraction studies reveal that the crystal belongs to orthorhombic system. Energy dispersive X-ray analysis confirms the presence of elements in the crystal. Structural perfection of the as-grown single crystal was studied through multicrystal X-ray diffraction analysis. The thermal characteristics of TGCC were analyzed by thermogravimetric and differential thermal analysis and differential scanning calorimetry. The transmittance of TGCC crystal has been used to calculate the optical band gap of the crystal. Chemical etching studies of TGCC crystal was carried out. The dielectric and mechanical behavior of the crystals were analyzed. The second harmonic conversion property of TGCC was identified by the Kurtz and Perry powder technique and was observed to be higher than that of KDP. 相似文献
124.
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126.
We generalize the basic quasifibration theorem of Dold and Thom (1958), replacing quasifibrations by weak equivalences. 相似文献
127.
五像限法太阳自动跟踪仪 总被引:2,自引:0,他引:2
介绍由两心圆组成的等面积五像限光测量装置工作原理,即当光线与光电池垂直时其投影光斑经过一透镜后正好安全覆盖五片光电池,当光线与光电池成一夹角时,其投影光斑必然发生偏移,将光主在光电池上的偏移转移成光电流差值的变化,实现装置自动跟踪太阳。 相似文献
128.
Chirped fibre Bragg grating based multiplexer and demultiplexer for DWDM applications 总被引:1,自引:0,他引:1
R. Romero O. Frazo F. Floreani L. Zhang P.V.S. Marques H.M. Salgado 《Optics and Lasers in Engineering》2005,43(9):987-994
A multiplexer/demultiplexer for 100 GHz channel spacing based on chirped fibre Bragg gratings with different bandwidths and optical circulators is presented. The spectral characteristics, specifications and operation of these passive devices are described, showing its potential use in dense wavelength division multiplexing (DWDM) applications. 相似文献
129.
E. Nguyen Cong Duc L. Fournier C. Levecq B. Lesjean P. Grelier A. Tazi-Pain 《Journal of membrane science》2008
The better understanding of the effective air distribution inside a membrane cassette is a particular challenge in submerged membrane bioreactor. The present study is the first one that investigates the hydrodynamics of the coarse bubbles flow inside a hollow fibre membranes cassette. The experimental investigations were carried out in a reactor equipped with commercial modules from ZENON ZeeWeed® 500d. A bi-optical probe was used to measure the bubble size, the bubble velocity and the gas hold-up at different locations between the modules and for three different gas flow rates. These local measurements gave significant information about the lateral distribution of the air and its evolution with the height on the surface of the membrane modules, which can impact on the filtration performance and are the first step to an optimisation of the aeration system and module geometry. 相似文献
130.