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Search Results: 1 - 10 of 141980 matches for " Zhang Jun-Xiang "
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The difference in noise property between the Autlerben Townes splitting medium and the electromagnetically induced transparent medium

Li Zhong-Hu,Li Yuan,Dou Ya-Fang,Zhang Jun-Xiang,

中国物理 B , 2012,
Abstract: The quantum noise of squeezed probe light passing through an atomic system with different electromagnetically induced transparency and Autler-Townes splitting effects is investigated theoretically. It is found that the optimal squeezing preservation of the outgoing probe beam occurs in the strong-coupling-field regime rather than in the weak-coupling-field regime. In the weak-coupling-field regime, which was recently recognized as the electromagnetically induced transparency regime (Abi-Salloum T Y 2010 Phys. Rev. A bf81 053836), the output amplitude noise is affected mainly by the atomic noise originating from the random decay process of atoms. While in the strong-coupling-field regime, defined as the Autler-Townes splitting regime, the output amplitude noise is affected mainly by the phase-to-amplitude conversion noise. This is useful in improving the quality of the experiment for efficient quantum memory, and hence has an application in quantum information processing.
(6aS,11aR,11cS)-8-Sulfanylidene-2,3,5,6,6a,7,11,11a,11b,11c-decahydro-3a,7a-diaza-1H,4H-benzo[de]anthracen-3a-ium chloride hemihydrate
Liang Wang,Chun-Mei Zhang,Jun-Xiang Guo,Qiu-Ye Wu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s160053681100972x
Abstract: The title compound, C15H23N2S+·Cl ·0.5H2O, was prepared from (6aS,11aR,11cS)-2,3,5,6,6a,7,11,11a,11b,11c-decahydro-3a,7a-diaza-1H,4H-benzo[de]anthracene-8-one (sophocarpine) and Lawesson's reagent. The thione-substituted ring is in an envelope conformation and the three other six-membered rings are in chair conformations. In the crystal, anions and cations are linked by N—H...Cl and weak C—H...Cl hydrogen bonds. One 0.5-occupancy solvent water molecule lies on a twofold rotation axis and another 0.25-occupancy solvent water molecule is in a general position. The H atoms of these water molecules were not located or included in the refinement.
(E)-Ethyl 4-[4-(diethylamino)styryl]benzoate
Yong-Yan Yao,Long Lv,Jun-Xiang Zhang,Hong-Wu He
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807065610
Abstract: In the title molecule, C21H25NO2, the dihedral angle between the two benzene rings is 4.8 (2)°. Both the ethyl group of the ester group and one of the ethyl groups attached to the N atom are disordered over two sites, the approximate occupancies being 66:34 and 81:19, respectively. In the cystal structure, there are no direction-specific interactions.
Apoptosis-promoting effect of Panax notoginseng extracts on MNNG-transformed GES-1 cells
LI Jun-Xiang
Zhong Xi Yi Jie He Xue Bao , 2005,
Abstract: Objective: To study the apoptosis-promoting effect of the serum from Panax notoginseng extracts-fed dog on precancerous gastric cells by means of flow cytometry. Methods: In the experiment, we adopted eternalized human gastric mucosa epithelium GES-1 cells transformed by N-methyl-N’-nitro-N-nitroso-guanidine (MNNG) (MC cells) as the model of precancerous lesions for study in vitro. We took the serum of a dog before and at two different points of time (2 and 6 hours) after feeding the dog with Panax notoginseng extracts for experiment. The MC cells were cultured in mediums with different concentrations of the medicated serum at 2- or 6-hour point of time for 72 hours. By means of flow cytometry, we examined the apoptosis-promoting effects of the serums on the MC cells. Results: The medicated serums at these 2 points of time had significant effects in promoting MC cell apoptosis. The proportions of apoptotic cells in culture mediums with medicated serums had a significant increase as compared with those in culture mediums with non-medicated serums (serum obtained before administration of extracts to the dog) under the same conditions (P<0.05). The number of MC cells in G0/G1 phase was decreased (P<0.05) and that in G2/M phase increased (P<0.05), while no consistent changes were observed in S phase. Conclusion: The medicated serums obtained at the two different points of time have significant apoptosis-promoting effects on MC cells. They decrease the number of MC cells in G0/G1 phase and increase the number of MC cells in G2/M phase. This is probably responsible for the effects of Panax notoginseng extracts in inhibiting the proliferation of MC cells and promoting its apoptosis.
Experience of treating severe acute respiratory syndrome with traditional Chinese medicine
LI Jun-Xiang
Zhong Xi Yi Jie He Xue Bao , 2004,
Abstract:
Effects of Radix notoginseng extracts drug-containing serum on expressions of bcl-2, Bax and p21WAF1 proteins in MNNG transformed GES-1 cells
Jun-xiang LI
Zhong Xi Yi Jie He Xue Bao , 2008,
Abstract: Objective: To investigate the effects of Radix notoginseng extracts drug-containing serum on the expressions of apoptosis-regulating proteins including Bax, bcl-2 and p21WAF1 in precancerous gastric cells. Methods: The N-methyl-N'-nitro-N-nitroso-guanidine (MNNG) transformed eternalized human gastric mucosa epithelium GES-1 cell line (MC cell) was used in vitro as a model of gastric precancerous lesion. The medicated canine serum was prepared by feeding to the adult Beagle dog with Radix notoginseng extracts and obtaining the serum after 2-hour medication. MC cells were cultured with medicated canine serum (medicated serum group) or non-medicated canine serum (normal control group) for 72 hours. Expressions of Bax, bcl-2 and p21WAF1 proteins were detected by immunocytochemical assay and the average optical density of the cells was determined by an image analysis system.Results: Compared with those of the normal control group, Bax and p21WAF1 expressions in medicated serum group were significantly enhanced (P<0.01), while the expression of bcl-2 was significantly reduced (P<0.01). Conclusion: Radix notoginseng extracts may inhibit the proliferation and promote the apoptosis of precancerous gastric cells through altering expressions of the bcl-2, Bax and p21WAF1 genes.
INTERFEROMETRIC DETECTION OF OPTICAL PHASE SHIFT USING TWIN BEAMS

Zhang Jun-xiang,Zhang Tian-cai,Xie Chang-de,Peng Kun-chi,

中国物理 B , 1999,
Abstract: An interferometric detection scheme to measure optical phase shift with sensi tivity beyond the shot noise limit is proposed. The theoretical calculation shows that using the quantum correlated twin beams produced from an optical parametric amplifier as the input fields of a Mach-Zehnder interferometer, the minimum detectable phase shift will exceed the shot noise limit N-1/2 and approach the Heisenberg limit N-1. The parametric dependences of the minimum detectable phase shift on the nonlinear interaction, input photon number, and detection efficiency are shown.
HOW DOES AN IMPERFECT SYSTEM AFFECT THE MEASUREMENT OF SQUEEZING?

ZHANG TIAN-CAI,ZHANG JUN-XIANG,XIE CHANG-DE,PENG KUN-CHI,

中国物理 B , 1998,
Abstract: The effect of an imperfect system on the measurement of squeezing is studied. It is shown that the imperfectly efficient detectors and the unbalance of the beam-splitter will reduce the measured squeezing. The effects on quadrat ure phase squeezing and photon number squeezing are different from the usual balanced homodyne detection.
Comparison of the Noise Properties of Squeezed Probe Light in Optically Thick and Thin Quantum Coherence Media for Weak and Strong Coupling Lights

LI Zhong-Hua,LI Yuan,DOU Ya-Fang,GAO Jiang-Rui,ZHANG Jun-Xiang,

中国物理快报 , 2012,
Abstract:
Noise-free frequency conversion of quantum states

Bai Yun-Fei,Zhai Shu-Qin,Gao Jiang-Rui,Zhang Jun-Xiang,

中国物理 B , 2011,
Abstract: In this paper, the frequency conversion of quantum states based on the intracavity nonlinear interaction is proposed. The fidelity of an input state after frequency conversion is calculated, and it is shown the noise-free frequency conversion of a quantum state can be achieved by injecting a strong signal field. The dependences of conversion efficiency on the pump parameter, extra losses and input state amplitude are also analysed.
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