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Search Results: 1 - 10 of 3319 matches for " Wenxuan Bi "
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Description of a new species of Distenia (Coleoptera, Disteniidae, Disteniini) from Southeastern China, with records and diagnoses of similar species
Wenxuan Bi,Meiying Lin
ZooKeys , 2013, DOI: 10.3897/zookeys.275.4700
Abstract: A new species, Distenia orientalis sp. n. is described from Southeastern China. It was misidentified as D. gracilis (Blessig, 1872) but can be separated from the latter by the color of antennae and legs, structure differences on scape, maxillary palp, pronotum, tibiae, punctures on elytra, etc. Three related species are carefully diagnosed and treated.
Instanton Correction, Wall Crossing And Mirror Symmetry Of Hitchin's Moduli Spaces
Wenxuan Lu
Mathematics , 2010,
Abstract: We study two instanton correction problems of Hitchin's moduli spaces along with their wall crossing formulas. The hyperkahler metric of a Hitchin's moduli space can be put into an instanton-corrected form according to physicists Gaiotto, Moore and Neitzke. The problem boils down to the construction of a set of special coordinates which can be constructed as Fock-Goncharov coordinates associated with foliations of quadratic differentials on a Riemann surface. A wall crossing formula of Kontsevich and Soibelman arises both as a crucial consistency condition and an effective computational tool. On the other hand Gross and Siebert have succeeded in determining instanton corrections of complex structures of Calabi-Yau varieties in the context of mirror symmetry from a singular affine structure with additional data. We will show that the two instanton correction problems are equivalent in an appropriate sense via the identification of the wall crossing formulas in the metric problem with consistency conditions in the complex structure problem. This result provides examples of Calabi-Yau varieties where the instanton correction (in the sense of mirror symmetry) of metrics and complex structures can be determined.
SYZ Mirror Symmetry of Hitchin's Moduli Spaces Near Singular Fibers I
Wenxuan Lu
Mathematics , 2012,
Abstract: We study hyperkahler metrics and hyperholomorphic connections of Hitchin's moduli spaces after Gaiotto, Moore and Neitzke. Their construction via the twistor technique produces intricate wall crossing behaviors. For certain four dimensional Hitchin's moduli spaces local models and degeneration to local models near singular fibers of the Hitchin's fibration are understood.
Stability Conditions and Mirror Symmetry of K3 Surfaces in Attractor Backgrounds
Wenxuan Lu
Mathematics , 2012,
Abstract: We study the space of stability conditions on $K3$ surfaces from the perspective of mirror symmetry. It is done in the so called attractor backgrounds (moduli) which can be far from the conventional large complex limits and are selected by the attractor mechanism for certain black holes. We find certain highly non-generic behaviors of stability walls (a key notion in the study of wall crossings) in the space of stability conditions. They correspond via mirror symmetry to some non-generic behaviors of special Lagrangians in an attractor background. The main results can be understood as a mirror correspondence in a synthesis of homological mirror conjecture and SYZ mirror conjecture.
Analysis of Influencing Mechanism of Banking Market Structure on Industrial Structural Upgrading  [PDF]
Wenxuan Pan
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.54005
Abstract: The change of banking market structure may finally influence of development of various industries via guiding the allocation of capital resources among industries. Based on panel data model and SYS-GMM estimation, this paper surveyed the influence of change of Chinese banking structure on industrial structural adjustment and then further explored the influencing mechanism in it. The result showed that, under overall samples, the increased proportion of non-state-owned banks in China not only is beneficial to the reasonable development of industrial structure, but also can promote advanced development; banking structure will influence the rationalization as well as optimization of Chinese industrial structure through technological progress and financing restraint looseness. The influencing mechanism of technological progress is positive while the influencing mechanism of financing restraint looseness on rationalization as well as optimization is in the opposite.
On Coverage and Capacity for Disaster Area Wireless Networks Using Mobile Relays
Wenxuan Guo,Xinming Huang
EURASIP Journal on Wireless Communications and Networking , 2009, DOI: 10.1155/2009/251314
Abstract: Public safety organizations increasingly rely on wireless technology to provide effective communications during emergency and disaster response operations. This paper presents a comprehensive study on dynamic placement of relay nodes (RNs) in a disaster area wireless network. It is based on our prior work of mobility model that characterizes the spatial movement of the first responders as mobile nodes (MNs) during their operations. We first investigate the COverage-oriented Relay Placement (CORP) problem that is to maximize the total number of MNs connected with the relays. Considering the network throughput, we then study the CApacity-oriented Relay Placement (CARP) problem that is to maximize the aggregated data rate of all MNs. For both coverage and capacity studies, we provide each the optimal and the greedy algorithms with computational complexity analysis. Furthermore, simulation results are presented to compare the performance between the greedy and the optimal solutions for the CORP and CARP problems, respectively. It is shown that the greedy algorithms can achieve near optimal performance but at significantly lower computational complexity.
On Coverage and Capacity for Disaster Area Wireless Networks Using Mobile Relays
Guo Wenxuan,Huang Xinming
EURASIP Journal on Wireless Communications and Networking , 2009,
Abstract: Public safety organizations increasingly rely on wireless technology to provide effective communications during emergency and disaster response operations. This paper presents a comprehensive study on dynamic placement of relay nodes (RNs) in a disaster area wireless network. It is based on our prior work of mobility model that characterizes the spatial movement of the first responders as mobile nodes (MNs) during their operations. We first investigate the COverage-oriented Relay Placement (CORP) problem that is to maximize the total number of MNs connected with the relays. Considering the network throughput, we then study the CApacity-oriented Relay Placement (CARP) problem that is to maximize the aggregated data rate of all MNs. For both coverage and capacity studies, we provide each the optimal and the greedy algorithms with computational complexity analysis. Furthermore, simulation results are presented to compare the performance between the greedy and the optimal solutions for the CORP and CARP problems, respectively. It is shown that the greedy algorithms can achieve near optimal performance but at significantly lower computational complexity.
Penalized Clustering of Large Scale Functional Data with Multiple Covariates
Ping Ma,Wenxuan Zhong
Statistics , 2008,
Abstract: In this article, we propose a penalized clustering method for large scale data with multiple covariates through a functional data approach. In the proposed method, responses and covariates are linked together through nonparametric multivariate functions (fixed effects), which have great flexibility in modeling a variety of function features, such as jump points, branching, and periodicity. Functional ANOVA is employed to further decompose multivariate functions in a reproducing kernel Hilbert space and provide associated notions of main effect and interaction. Parsimonious random effects are used to capture various correlation structures. The mixed-effect models are nested under a general mixture model, in which the heterogeneity of functional data is characterized. We propose a penalized Henderson's likelihood approach for model-fitting and design a rejection-controlled EM algorithm for the estimation. Our method selects smoothing parameters through generalized cross-validation. Furthermore, the Bayesian confidence intervals are used to measure the clustering uncertainty. Simulation studies and real-data examples are presented to investigate the empirical performance of the proposed method. Open-source code is available in the R package MFDA.
BAINITE TRANSFORMATION FROM HOT DEFORMED AUSTENITE IN HSLA STEELS

CUI Wenxuan,LIU Zikui,

材料研究学报 , 1988,
Abstract: The kinetics,the morphology,the substructure and orientation relation-ship of bainite transformed from hot deformed recrystallized austenite andhot deformed unrecrystallized austenite of three HSLA steels have beeninvestigated.The effects of hot deformed
Altitudinal Variation in Leaf Nitrogen Concentration on the Eastern Slope of Mount Gongga on the Tibetan Plateau, China
Weiqi Shi, Guoan Wang, Wenxuan Han
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0044628
Abstract: Mount Gongga spans 6500 m in elevation and has intact and continuous vertical vegetation belts, ranging from subtropical evergreen broad-leaved vegetation to an alpine frigid sparse grass and desert zone. Investigating the altitudinal trends in leaf nitrogen (N) on Mount Gongga can increase our understanding of the global biogeography of foliar N. In this study, 460 leaf samples from mosses, ferns, and seed plants were collected along an altitudinal gradient on the eastern slope of Mount Gongga, and the variation in leaf N concentration (mass basis) with elevation was analyzed. There are considerable differences in leaf N between mosses and ferns, mosses and seed plants, C4 and C3 plants, and evergreen and deciduous woody plants. The general altitudial pattern of leaf N in Mount Gongga plants was that leaf N kept increasing until an elevation of about 2200 m above sea level, with a corresponding mean annual temperature (MAT) of 8.5°C, and then decreased with increasing elevation. However, the evergreen woody plants displayed a decline trend in leaf N across the altitude gradient. Our findings provide an insight into the altitudinal variation in leaf N.
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