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Search Results: 1 - 10 of 39022 matches for " Xun Yan "
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A study of the Acceptance of Material Incentives and Non-Material Incentives in Agri-Business Companies  [PDF]
Ming Fang, Yan Qi, Xun Liu, Yan Wang
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29025
Abstract:

As a vital part of an organization, human resources management has been drawing broad attention both industrially and academically. Motivation is a significant content of HRM, which can be divided into material incentive and non-material incentive. This paper investigated the Chinese agri-business companies’ motivation methods and gave suggestions. This paper uses questionnaire and statistical analysis to explore and confirm that agriculture companies should pay attention not only to material incentive, but also non-material incentive. A Chinese agri-business company has been chosen for study.

THE EFFECTS OF RARE EARTHS ON ACTIVITY AND SURFACE PROPERTIES OF Ru/γ-AL2O3 CATALYST FOR WATER GAS SHIFT REACTION
Laitao Luo, Yan Ouyang, Xun Lu, Xun Lu, Qingbo Chen
Bulletin of the Chemical Society of Ethiopia , 2007,
Abstract: A series of Ru-RE/γ-AL2O3 (RE = Ce, Pr, La, Sm, Tb or Gd) and Ru/γ-AL2O3 catalysts were prepared by impregnation method. The influence of rare earths on the catalytic performance of Ru/γ-AL2O3 catalyst for the water gas shift reaction was studied. The catalysts were characterized by X-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed desorption (TPD), and CO chemisorption. The results show that the addition of rare earths increases the catalytic activity of Ru based catalyst. Among these cerium is the most remarkably. The addition of cerium increases the active surface area, improves the dispersion of ruthenium, and weakens the interaction between ruthenium and the support. Cerium also affects the adsorption and reduction properties of Ru/γ-AL2O3 catalyst. KEY WORDS: Rare earths, Ruthenium-based catalyst, Water gas shift reaction Bull. Chem. Soc. Ethiop. 2007, 21(3), 389-395.
Ecological Compensation: A Key to Sustainable Development in the Guizhou Province Karst Region, Southwest China  [PDF]
Chuanyan Zhou, Brita M. Svensson, Junhua Yan, Xun Chen, Kun Li
Open Journal of Forestry (OJF) , 2014, DOI: 10.4236/ojf.2014.43028
Abstract:

The conflict between poverty and the resulting over-exploitation of natural resources on the one hand, and ecological restoration and sustainable development on the other hand, in the southwest China karst region was studied. In this region, the karst forest (a mixed evergreen and deciduous broad-leaved forest) is rapidly degrading due to over-exploitation (sloping farming). We suggest that an Ecological Compensation (EC) model should be established with: financial institutions, local people, and a third part as an intermediate link. The process would continue for 20 years. As a case study we used Bangui town (3800 families) in the upper reaches of Pearl River. The per capita income of residents was used as the benchmark. The compensation would start with 80%, and decrease to 20% over a period of 20 years. Infrastructure investment would decrease from 20% of the total person’s compensation to 5% as the farmers increasingly use alternative income sources. The EC includes compensation for individual, infrastructure, and environmental investments. The total EC for Bangui would be 305,064 × 104 yuan during the 20 years.

Effect of the Wyckoff position of K atom on the crystal structure and electronic properties of KFe$_2$Se$_2$ compound
Xun-Wang Yan,Miao Gao
Physics , 2012, DOI: 10.1088/0953-8984/24/45/455702
Abstract: By the first-principle electronic structure calculations, we study the effect of Wyckoff position of K atom on the crystal and electronic structures of KFe$_2$Se$_2$ compound.When the K atoms take up the Wyckoff position $2a$, $2b$ or $4c$ (the related structure of KFe$_2$Se$_2$ is called as Struc-2a, Struc-2b or Struc-4c), the calculated lattice constant $c$ is in the range of 13.5$\sim$14.5 \AA{}, 15.5$\sim$16.7 \AA{} or 18.6$\sim$19.1 \AA{}.Three concentric cylinder-like Fermi surfaces emerge around $\Gamma$-Z in Brillouin Zone for the Struc-2b in nonmagnetic state, different from the Struc-2a and Struc-4c.The Fe-Se-Fe angle is 107.8$^\circ$, 108.8$^\circ$ or 110.7$^\circ$ in the collinear anti-ferromagnetic state and the superexchange interaction $J_2$ between two next neighbor Fe moments is 13.08 meV/S$^2$, 20.75 meV/S$^2$ or 11.86 meV/S$^2$ in Struct-2a, Struc-2b or Struc-4c structure respectively.The Struc-2b and Struc-4c have a good correspondence to the newly discovered superconducting phases with T$_c$=40 K and T$_c$=30 K in KFe$_2$Se$_2$.Our findings provide a reasonable approach to understand the existence of multiple superconducting phases in alkali metal intercalated FeSe superconductor.
Hydrogen Production by Coal Gasification Coupled with in Situ CO2 Capture  [PDF]
Xun Wang
Energy and Power Engineering (EPE) , 2012, DOI: 10.4236/epe.2012.44029
Abstract: CO2 adsorption enhanced gasification process is a prospective technology to be used in hydrogen production with nearly zero CO2 emission. In this paper, a gasification kinetics steady state model is developed based on the chemical kinetics mechanism with the condition of fluidization. It is used to predict the parameters of gas phase and solid phase for a continuous flow reactor with steady state. The variation of components distribution with gasification temperature and pressure are determined, from which the optimal operation parameters of gasifier can be obtained.
Genetic and Proteomic Characterization of rpoB Mutations and Their Effect on Nematicidal Activity in Photorhabdus luminescens LN2
Xuehong Qiu, Xun Yan, Mingxing Liu, Richou Han
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0043114
Abstract: Rifampin resistant (RifR) mutants of the insect pathogenic bacterium Photorhabdus luminescens LN2 from entomopathogenic nematode Heterorhabditis indica LN2 were genetically and proteomically characterized. The RifR mutants showed typical phase one characters of Photorhabdus bacteria, and insecticidal activity against Galleria mellonella larvae, but surprisingly influenced their nematicidal activity against axenic infective juveniles (IJs) of H. bacteriophora H06, an incompatible nematode host. 13 out of 34 RifR mutants lost their nematicidal activity against H06 IJs but supported the reproduction of H06 nematodes. 7 nematicidal-producing and 7 non-nematicidal-producing RifR mutants were respectively selected for rpoB sequence analysis. rpoB mutations were found in all 14 RifR mutants. The rpoB (P564L) mutation was found in all 7 mutants which produced nematicidal activity against H06 nematodes, but not in the mutants which supported H06 nematode production. Allelic exchange assays confirmed that the Rif-resistance and the impact on nematicidal activity of LN2 bacteria were conferred by rpoB mutation(s). The non-nematicidal-producing RifR mutant was unable to colonize in the intestines of H06 IJs, but able to colonize in the intestines of its indigenous LN2 IJs. Proteomic analysis revealed different protein expression between wild-type strain and RifR mutants, or between nematicidal-producing and non nematicidal-producing mutants. At least 7 putative proteins including DsbA, HlpA, RhlE, RplC, NamB (a protein from T3SS), and 2 hypothetical proteins (similar to unknown protein YgdH and YggE of Escherichia coli respectively) were probably involved in the nematicidal activity of LN2 bacteria against H06 nematodes. This hypothesis was further confirmed by creating insertion-deletion mutants of three selected corresponding genes (the downregulated rhlE and namB, and upregualted dsbA). These results indicate that the rpoB mutations greatly influence the symbiotic association between the symbionts and their entomopathogenic nematode hosts.
Cumulative second-harmonic generation of Lamb waves propagating in a two-layered solid plate

Xiang Yan-Xun,Deng Ming-Xi,

中国物理 B , 2008,
Abstract: The physical process of cumulative second-harmonic generation of Lamb waves propagating in a two-layered solid plate is presented by using the second-order perturbation and the technique of nonlinear reflection of acoustic waves at an interface. In general, the cumulative second-harmonic generation of a dispersive guided wave propagation does not occur. However, the present paper shows that the second-harmonic of Lamb wave propagation arising from the nonlinear interaction of the partial bulk acoustic waves and the restriction of the three boundaries of the solid plates does have a cumulative growth effect if some conditions are satisfied. Through boundary condition and initial condition of excitation, the analytical expression of cumulative second-harmonic of Lamb waves propagation is determined. Numerical results show the cumulative effect of Lamb waves on second-harmonic field patterns.
Time-domain analysis of second-harmonic generation of primary Lamb wave propagation in an elastic plate

Deng Ming-Xi,Xiang Yan-Xun,

中国物理 B , 2010,
Abstract: Within the second-order perturbation approximation, this paper investigates the physical process of generation of the time-domain second harmonic by a primary Lamb wave waveform in an elastic plate. The present work is performed based on the preconditions that the phase velocity matching is satisfied and that the transfer of energy from the primary Lamb wave to the double frequency Lamb wave is not zero. It investigates the influences of the difference between the group velocities of the primary Lamb wave and the double frequency Lamb wave, the propagation distance and the duration of the primary Lamb wave waveform on the envelope shape of the time-domain second harmonic. It finds that the maximum magnitude of the envelope of the second-harmonic waveform can grow within some propagation distance even if the condition of group velocity matching is not satisfied. Our analyses also indicate that the maximum magnitude of the envelope of the second-harmonic waveform is kept constant beyond a specific propagation distance. Furthermore, it concludes that the integration amplitude of the time-domain second-harmonic waveform always grows with propagation distance within the second-order perturbation. The present research yields new physical insight not previously available into the effect of generation of the time-domain second harmonic by propagation of a primary Lamb wave waveform.
Biodegradation of phenol and m-cresol by mutated Candida tropicalis

Yan Jiang,Xun Cai,Di Wu,Nanqi Ren,

环境科学学报(英文版) , 2010,
Abstract: The phenol and m-cresol biodegradations were studied using the mutant strain CTM 2 obtained by the He-Ne laser irradiation on wild-type Candida tropicalis. The results showed that C. tropicalis exhibited the increased capacity of phenolic compounds degradation after laser irradiation. It could degrade 2600 mg/L phenol and 300 mg/L m-cresol by 5% inoculum concentration, respectively. In the dual-substrate biodegradation system, 0-500 mg/L phenol could accelerate m-cresol biodegradation, and 300 mg/L m-cresol could be completely utilized within 46 hr at the presence of 350 mg/L phenol. Besides, the maximum biodegradation of m-cresol could reach 350 mg/L with 80 mg/L phenol within 61 hr. Obviously, phenol, as a growth substrate, could promote CTM 2 to degrade m-cresol, and was always preferentially utilized as carbon source. Comparatively, low-concentration m-cresol could result in a great inhibition on phenol degradation. In addition, the kinetic behaviors of cell growth and substrate biodegradation were described by kinetic model proposed in our laboratory.
Zero-bias anomaly in one-dimensional ultrathin metallic nanowires
Hui Yan,Rui Xu,Xun Hong,Yi Sun
AIP Advances , 2012, DOI: 10.1063/1.4747799
Abstract: The electronic properties of ultrathin bimetallic Au/Ag nanowires with 2-3 nm in diameter were explored by scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) at liquid-nitrogen temperature. A pronounced dip around zero-bias, followed by a series of discrete single electron tunneling peaks at both negative and positive bias, is observed in the tunneling spectra. Several possible mechanisms, such as exchange interaction and Luttinger-liquid behavior, for the presence of the dip around zero-bias in the Au/Ag nanowires are excluded. Our experimental results and analysis indicate that the disorder of the bimetallic nanowire as the origin of the dip around zero-bias.
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