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Search Results: 1 - 10 of 120191 matches for " Xuemin Wang "
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Lipid signaling in plants
Xuemin Wang,Kent D. Chapman
Frontiers in Plant Science , 2013, DOI: 10.3389/fpls.2013.00216
Abstract:
Differential Gene Expression for Curvularia eragrostidis Pathogenic Incidence in Crabgrass (Digitaria sanguinalis) Revealed by cDNA-AFLP Analysis
Jianshu Wang, Xuemin Wang, Bohua Yuan, Sheng Qiang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0075430
Abstract: Gene expression profiles of Digitaria sanguinalis infected by Curvularia eragrostidis strain QZ-2000 at two concentrations of conidia and two dew durations were analyzed by cDNA amplified fragment length polymorphisms (cDNA-AFLP). Inoculum strength was more determinant of gene expression than dew duration. A total of 256 primer combinations were used for selective amplification and 1214 transcript-derived fragments (TDFs) were selected for their differential expression. Of these, 518 up-regulated differentially expressed TDFs were identified. Forty-six differential cDNA fragments were chosen to be cloned and 35 of them were successfully cloned and sequenced, of which 25 were homologous to genes of known function according to the GenBank database. Only 6 genes were up-regulated in Curvularia eragrostidis-inoculated D. sanguinalis, with functions involved in signal transduction, energy metabolism, cell growth and development, stress responses, abscisic acid biosynthesis and response. It appears that a few pathways may be important parts of the pathogenic strategy of C. eragrostidis strain QZ-2000 on D. sanguinalis. Our study provides the fundamentals to further study the pathogenic mechanism, screen for optimal C. eragrostidis strains as potential mycoherbicide and apply this product to control D. sanguinalis.
Effects of the surface-adsorption of boron-doped diamond electrode on its electrochemical behavior
Fengbin Liu,Xuemin Li,Jiadao Wang,Bing Liu,Darong Chen
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2024-1
Abstract: To elucidate the effects of the hydrogenation and oxygenation of the boron-doped diamond (BDD) electrode on its electrochemical behaviors, the surface morphologies and phases of the two surface-adsorption BDD films have been investigated and the cyclic voltammograms and AC impedance spectra have been measured at these two BDD electrodes. The results indicate that compared with the hydrogen-adsorption BDD film, oxygen-adsorption BDD film is less conductive, and has a larger surface roughness and a lower sp3/sp2 ratio. The oxygenated BDD film electrode possesses a wider electrochemical window, larger diamond film resistance and capacitance and a larger polarization resistance than hydrogenated BDD electrode. In addition, the effect mechanism of the surface-adsorption of BDD electrode on its electrochemical behaviors has been discussed.
Electronic structures of the oxygenated diamond (100) surfaces
Fengbin Liu,Jiadao Wang,Bing Liu,Xuemin Li,Darong Chen
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2139-4
Abstract: By means of first principles method on the basis of density functional theory (DFT), the equilibrium geometries and density of states (DOS) of the two oxygenated diamond (100) surfaces, bridging model and on-top model are calculated. The results indicate that there are no surface states located in the band gap of the bridging model of oxygenated diamond (100) surface, and the occupied surface states in the valence band are attributed to the non-bonded O 2p orbital, O 2p and C 2p bonding orbitals, and C 2p and H 1s bonding orbitals. By contrast, for the on-top model of oxygenated diamond (100) surface, the unoccupied surface states exist in the band gap, which originate from non-bonded C 2p and O 2p orbitals. In addition, the occupied surface states in the valence band are induced by non-bonded O 2p orbital and the C=O π bond.
A Review on Analysis and Synthesis of Nonlinear Stochastic Systems with Randomly Occurring Incomplete Information
Hongli Dong,Zidong Wang,Xuemin Chen,Huijun Gao
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/416358
Abstract:
Ultra-Sensitivity Glucose Sensor Based on Field Emitters
Liu Huibiao,Qian Xuemin,Wang Shu,Li Yuliang
Nanoscale Research Letters , 2009,
Abstract: A new glucose sensor based on field emitter of ZnO nanorod arrays (ZNA) was fabricated. This new type of ZNA field emitter-based sensor shows high sensitivity with experimental limit of detection of 1 nM glucose solution and a detection range from 1 nM to 50 μM in air at room temperature, which is lower than that of glucose sensors based on surface plasmon resonance spectroscopy, fluorescence signal transmission, and electrochemical signal transduction. The new glucose sensor provides a key technique for promising consuming application in biological system for detecting low levels of glucose on single cells or bacterial cultures.
A New Method for Flow Rate Measurement in Millimeter-Scale Pipes
Haifeng Ji,Xuemin Gao,Baoliang Wang,Zhiyao Huang,Haiqing Li
Sensors , 2013, DOI: 10.3390/s130201563
Abstract: Combining the Capacitively Coupled Contactless Conductivity Detection (C 4D) technique and the principle of cross correlation flow measurement, a new method for flow rate measurement in millimeter-scale pipes was proposed. The research work included two parts. First, a new five-electrode C 4D sensor was developed. Second, with two conductivity signals obtained by the developed sensor, the flow rate measurement was implemented by using the principle of cross correlation flow measurement. The experimental results showed that the proposed flow rate measurement method was effective, the developed five-electrode C 4D sensor was successful, and the measurement accuracy was satisfactory. In five millimeter-scale pipes with different inner diameters of 0.5, 0.8, 1.8, 3.0 and 3.9 mm respectively, the maximum relative difference of the flow rate measurement between the reference flow rate and the measured flow rate was less than 5%.
Spatial-Temporal Correlation Properties of the 3GPP Spatial Channel Model and the Kronecker MIMO Channel Model
Cheng-Xiang Wang,Xuemin Hong,Hanguang Wu,Wen Xu
EURASIP Journal on Wireless Communications and Networking , 2007, DOI: 10.1155/2007/39871
Abstract: The performance of multiple-input multiple-output (MIMO) systems is greatly influenced by the spatial-temporal correlation properties of the underlying MIMO channels. This paper investigates the spatial-temporal correlation characteristics of the spatial channel model (SCM) in the Third Generation Partnership Project (3GPP) and the Kronecker-based stochastic model (KBSM) at three levels, namely, the cluster level, link level, and system level. The KBSM has both the spatial separability and spatial-temporal separability at all the three levels. The spatial-temporal separability is observed for the SCM only at the system level, but not at the cluster and link levels. The SCM shows the spatial separability at the link and system levels, but not at the cluster level since its spatial correlation is related to the joint distribution of the angle of arrival (AoA) and angle of departure (AoD). The KBSM with the Gaussian-shaped power azimuth spectrum (PAS) is found to fit best the 3GPP SCM in terms of the spatial correlations. Despite its simplicity and analytical tractability, the KBSM is restricted to model only the average spatial-temporal behavior of MIMO channels. The SCM provides more insights of the variations of different MIMO channel realizations, but the implementation complexity is relatively high.
Effects of Violent and Non-violent Computer Video Games on Explicit and Implicit Aggression
Xuemin Zhang,Chang Liu,Langlang Wang,Qiuhong Piao
Journal of Software , 2010, DOI: 10.4304/jsw.5.9.1014-1021
Abstract: The effect of violent media on aggression has always been highly concerned by the public. The effect of violent video game has been studied by researchers for many years, while how the interaction (competition and cooperation) work during video game play is still little known. In present study, the effect of non-violent video games on aggression was tested by experimental design. Participants were assigned to 6 groups to play a violent video game or a nonviolent video game, and he or she played competitively or cooperatively with another participant, or played the game alone. Competitive Reaction Time Task was used to test aggressive behavior. EAST task and SHS scale were used to test aggressive cognition and affect. The results indicated both violent content and competition can arouse aggressive cognition and aggressive behavior. Only violent content can arouse
Spatial-Temporal Correlation Properties of the 3GPP Spatial Channel Model and the Kronecker MIMO Channel Model
Wang Cheng-Xiang,Hong Xuemin,Wu Hanguang,Xu Wen
EURASIP Journal on Wireless Communications and Networking , 2007,
Abstract: The performance of multiple-input multiple-output (MIMO) systems is greatly influenced by the spatial-temporal correlation properties of the underlying MIMO channels. This paper investigates the spatial-temporal correlation characteristics of the spatial channel model (SCM) in the Third Generation Partnership Project (3GPP) and the Kronecker-based stochastic model (KBSM) at three levels, namely, the cluster level, link level, and system level. The KBSM has both the spatial separability and spatial-temporal separability at all the three levels. The spatial-temporal separability is observed for the SCM only at the system level, but not at the cluster and link levels. The SCM shows the spatial separability at the link and system levels, but not at the cluster level since its spatial correlation is related to the joint distribution of the angle of arrival (AoA) and angle of departure (AoD). The KBSM with the Gaussian-shaped power azimuth spectrum (PAS) is found to fit best the 3GPP SCM in terms of the spatial correlations. Despite its simplicity and analytical tractability, the KBSM is restricted to model only the average spatial-temporal behavior of MIMO channels. The SCM provides more insights of the variations of different MIMO channel realizations, but the implementation complexity is relatively high.
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