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Search Results: 1 - 10 of 37446 matches for " Yao Cheng "
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Nuclear spin-density wave theory
Yao Cheng
Physics , 2009,
Abstract: Recently [arXiv:0906.5417], we reported a quantum phase transition of 103mRh excited by bremsstrahlung pumping. The long-lived Moessbauer excitation is delocalized as a neutral quasiparticle carrying a spin current. This letter gives a general theory for a nuclear spin-density wave propagating on crystals consisting of identical nuclei with a multipolar transition.
Quantum phase transition of the 103mRh spin-density wave
Yao Cheng
Physics , 2009,
Abstract: We induce a quantum phase transition of the 103mRh excitation at the critical density of 10^{12} cm^{-3} by bremsstrahlung pumping at 300 K. A massive 103mRh spin-density wave carrying a spin current moves on the identical 103Rh matrix like a quantum fluid. The collapse-and-revival spectral evolution indicates that the collective nuclear excitation undergoes dynamic Bose-Einstein condensation. Applying an external magnetic field, we observe the Onsager-Feynman quantization, which gives further evidence of the superfluidic phase.
Inventory Management and Logistics Cost Reduction: A Case of a Malaysia Herbal Medicine Company  [PDF]
Fadilah Siali, Liu Yao, Cheng Jack Kie
Technology and Investment (TI) , 2013, DOI: 10.4236/ti.2013.43024
Abstract: Nowadays many studies have stressed the diagnosing inventory systems. This article examined problems encountered on logistics in a Malaysia herbal medicine company. The diagnosis was conducted using the fish bone diagram for the whole supply chain process from the production, hub warehouse, freight forwarders, zone warehouse to customers. The derived results highlight the inventory level management as the root reason, which leads to a set of initial recommendations, including: 1) install the computer-based software system to control inventory level which is to be integrated with the supply chain; and 2) meanwhile implement aggressive marketing approaches to minimize the rate of the returned products.
Advances in pharmacological studies of silymarin
Rui, Yao-Cheng;
Memórias do Instituto Oswaldo Cruz , 1991, DOI: 10.1590/S0074-02761991000600020
Abstract: silymarin is the flavonoids extracted from the seeds of silybum marianum (l) gearth as a mixture of three structural isomers: silybin, silydianin and silychristin, the former being the most active component. silymarin protects liver cell membrane against hepatotoxic agents and improves liver function in experimental animals and humans. it is generally accepted that silymarin exerts a membrane-stabilizing action preventing or inhibiting membrane peroxidation. the experiments with soybean lipoxygenase showed that the three components of silymarin brought about a concentration-dependent non-competitive inhibition of the lipoxygenase. the experiments also showed an analogous interaction with animal lipoxygenase, thus showing that an inhibition of the peroxidation of the fatty acid in vivo was self-evident. silybin almost completely suppressed the formation of pg at the highest concentration (0.3 mm) and proved to be an inhibitor of pg synthesis in vitro. in our experiments, silybin at lower dose (65 mg/kg) decreased liver lipoperoxide content and microsomal lipoperoxidation to 84.5% and 68.55% of those of the scalded control rats respectively, and prevented the decrease of liver microsomal cytochrome p-450 content and p-nitroanisole-0-demethylase activity 24 h post-scalding. effects of silymarin on cardiovascular systen have been studied in this university since 1980. o. o silymarin 800 mg/kg/d or silybin 600 mg/kg/d reduced plasma total cholesterol, ldl-c and vldl-c. they however, enhanced hdl-c in hyperlipenic rats. further studies showed that silymarin enhanced hdl-c in hyperlipemic rats. further studies showed that silymarin enhanced hdl-c but didn't affect hdl-c, a property of this component which is beneficial to treatment of atherosclerosis. the results showed silymarin 80 mg or silybin 60 mg decreased in vitro platelet aggregation (porcentagem) in rats. the maximal platelet aggregation induced by adp declined significantly, and time to reach maximal platelet agg
Multi-scale interactions of geological processes during mineralization: cascade dynamics model and multifractal simulation
L. Yao,Q. Cheng
Nonlinear Processes in Geophysics (NPG) , 2011,
Abstract: Relations between mineralization and certain geological processes are established mostly by geologist's knowledge of field observations. However, these relations are descriptive and a quantitative model of how certain geological processes strengthen or hinder mineralization is not clear, that is to say, the mechanism of the interactions between mineralization and the geological framework has not been thoroughly studied. The dynamics behind these interactions are key in the understanding of fractal or multifractal formations caused by mineralization, among which singularities arise due to anomalous concentration of metals in narrow space. From a statistical point of view, we think that cascade dynamics play an important role in mineralization and studying them can reveal the nature of the various interactions throughout the process. We have constructed a multiplicative cascade model to simulate these dynamics. The probabilities of mineral deposit occurrences are used to represent direct results of mineralization. Multifractal simulation of probabilities of mineral potential based on our model is exemplified by a case study dealing with hydrothermal gold deposits in southern Nova Scotia, Canada. The extent of the impacts of certain geological processes on gold mineralization is related to the scale of the cascade process, especially to the maximum cascade division number nmax. Our research helps to understand how the singularity occurs during mineralization, which remains unanswered up to now, and the simulation may provide a more accurate distribution of mineral deposit occurrences that can be used to improve the results of the weights of evidence model in mapping mineral potential.
3,19-Diacetyl-12-nitromethyl-14-deoxyandrographolide
Juan Jia,Cheng Yao
Acta Crystallographica Section E , 2009, DOI: 10.1107/s160053680904402x
Abstract: In the crystal of the title compound, C24H33NO9, intermolecular C—H...O hydrogen bonds link the molecules.
Anomalous emissions of 103mRh biphoton transitions
Yao Cheng,Bing Xia
Physics , 2009,
Abstract: In this report, the anomalous emissions, centered on the one half transition energy 39.76/2 keV, are observed from the long-lived Mossbauer state of 103mRh excited by bremsstrahlung exposure. Strong coupling with identical nuclei in Rh crystals opens cascade channels for biphoton transitions.
Possible Stimulated Emission of Entangled Rhodium Mossbauer Gammas
Yao Cheng,Zhongming Wang
Physics , 2006,
Abstract: Observation of possible stimulated emission of Mossbauer gamma is reported by liquid-nitrogen quenching of rhodium sample from room temperature to 77K in the time-resolved Mossbauer spectroscopy. Recently, we have demonstrated the anomalous emission of three entangled gammas of the E3 Mossbauer transition generated by bremsstrahlung irradiation. In this work, we further report the high-speed decay of excited state. We conjecture that cooling shrinkage, gravitational redshift and crystal lattice collimate entangled gammas in a linear cavity. This opens up a new approach towards gamma lasing, if the stimulated emission occurs at this obtained low excitation density.
Rhodium Mossbauer Superradiance of Observable Gravitational Effect
Yao Cheng,Bing Xia
Physics , 2007,
Abstract: We summarize the experimental observations of three case studies on the long-lived rhodium Mossbauer Effect. Extraordinary observations reported in this work manifest the open-up of photonic band gap in analogy to the superconducting gap. Observable gravitational effect is manifested by the superradiance of different sample orientations corresponding to the earth gravity. These observations are of potential importance for detecting gravitational waves and development of the two-photon gamma laser.
Gamma Standing Wave in the Photonic Crystal of Resonant Rh Nuclei
Yao Cheng,Bing Xia
Physics , 2007,
Abstract: In a previous report, we have shown that the rhodium lattice consisting of resonant nuclei is an ideal photonic crystal in nature. Plenty of extraordinary observations are attributed to the collective down conversion of the multipolar nuclear transition; in particular the spontaneous open up of photonic band gap. Emissions of directionality depending on the macroscopic geometry manifest that the standing wave is global in the polycrystalline sample. In this work, further observations of the directional emissions are summarized. By applying an external magnetic field at room temperature, not only the predicted macroscopic nuclear polarization but also its strong directionality are demonstrated. The standing wave lasts for more than hundred hours at room temperature in the single crystal despite its natural half-life of one hour. The so-called nuclear Raman Effect between two M4 transitions of 193mIr and 195mPt and the E3 transition of 103mRh is discovered, which gives the brand new aspects to detect gravitational waves.
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