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Search Results: 1 - 10 of 59497 matches for " Bo Wu "
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Numerical Investigation of Traveling Wave Electroosmotic Flows in A Microchannel  [PDF]
Bo Chen, Jiankang Wu, Han Chen
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2012, DOI: 10.4236/jbnb.2012.322034
Abstract: In this paper, a coordinate transformation method (CTM) is employed to numerically solve the Poisson–Nernst–Planck (PNP) equation and Navier–Stokes (NS) equations for studying the traveling-wave electroosmotic flow (TWEF) in a two-dimensional microchannel. Numerical solutions indicate that the numerical solutions of TWEF with and without the coordinate transformation are in good agreement, while CTM effectively improves stability and convergence rate of the numerical solution, and saves computational cost. It is found that the averaged flow velocity of TWEF in a micro-channel strongly depends on frequency of the electric field. Flow rate achieves a maximum around the charge frequency of the electric double layer. The approximate solutions of TWEF with slip boundary conditions are also presented for comparison. It is shown that the NS solution with slip boundary conditions agree well with those of complete PNP-NS equations in the cases of small ratios of Electric double layer(EDL) thickness to channel depth(λD/H). The NS solution with slip boundary conditions over-estimates the electroosmotic flow velocity as this ratio(λD/H) is large.
A Service-Oriented Architecture for Proactive Geospatial Information Services
Haifeng Li,Bo Wu
Future Internet , 2011, DOI: 10.3390/fi3040298
Abstract: The advances in sensor network, linked data, and service-oriented computing has indicated a trend of information technology, i.e., toward an open, flexible, and distributed architecture. However, the existing information technologies show a lack of effective sharing, aggregation, and cooperation services to handle the sensors, data, and processing resources to fulfill user’s complicated tasks in near real-time. This paper presents a service-orientated architecture for proactive geospatial information services (PGIS), which integrates the sensors, data, processing, and human services. PGIS is designed to organize, aggregate, and co-operate services by composing small scale services into service chains to meet the complicated user requirements. It is a platform to provide real-time or near real-time data collection, storage, and processing capabilities. It is a flexible, reusable, and scalable system to share and interoperate geospatial data, information, and services. The developed PGIS framework has been implemented and preliminary experiments have been performed to verify its performance. The results show that the basic functions such as task analysis, managing sensors for data acquisition, service composition, service chain construction and execution are validated, and the important properties of PGIS, including interoperability, flexibility, and reusability, are achieved.
Developing stages and causes of desertification in the Mu Us sandland
Bo Wu,Longjun Ci
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885034
Abstract: Based on historical aerial photography of three periods and together with field investigation, the status of desertification development after the 1950s in the Mu Us sandland was analyzed, the difference of the desertification developing speed at two stages was compared, and its possible causes were explored. The results show that the developing speed of desertification from the late 1970s to the early 1990s is apparently slowed down, compared with that from the late 1950s to the late 1970s and there exists an obvious recovery trend at the second stage. The difference between the two stages accounts for severely over-reclaiming, over-grazing and unrestricted cutting during the first stage, which are the main causes of desertification development in the semi-arid steppe and arid desert steppe areas.
Prediction of decadal variability of sea surface temperature by a coupled global climate model FGOALS_gl developed in LASG/IAP
Bo Wu,TianJun Zhou
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-012-5134-y
Abstract: A decadal climate prediction was performed by a coupled global climate model FGOALS_gl developed by the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) within the Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences. First, an Incremental Analysis Updates (IAU) scheme was applied to assimilate surface and subsurface ocean temperature and salinity fields derived from oceanic objective analysis data, for the initialization of the ocean component of the model. Starting from the initialized states, hindcast integrations were performed with the specified historical solar cycle variations, concentrations of greenhouse gasses and sulfate aerosol, following the standard 20C3M scenario used in phase three of the Coupled Model Intercomparison Project (CMIP3). Based on the hindcast integrations, we performed forecast integrations under the radiative forcing of the A1B scenario in the CMIP3. Compared with the 20C3M run, the hindcast integrations have a much higher ability to simulate the decadal variability of SST (Sea Surface Temperature) in the tropical central-eastern Pacific and mid-latitude northeastern Pacific. This suggests that the ocean initialization is able to enhance the model skill in the regions with large decadal variability. The forecast integrations suggest that the SST in the tropical central-eastern Pacific has reached its trough phase, and will gradually increase in the following 10–15 years. Meanwhile, the global mean surface temperature predicted by the forecast integrations increases slower than that projected by the A1B scenario run over 2000–2010, but faster than the latter after that.
4-(5-Hydroxymethyl-2-methoxyphenoxy)benzoic acid
Yanyan Niu,Bo Wu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811012190
Abstract: The title compound, C15H14O5, crystallizes with two independent molecules in the asymmetric unit in which the benzene rings are inclined at dihedral angles of 79.4 (1) and 84.2 (1)°. In the crystal, intermolecular O—H...O hydrogen bonds link the molecules into double chains propagating in [001].
The Study of a Class of Pest Control Pollution Model with Stage-Structure and Time Delay
Jianwen Jia,Bo Wu
ISRN Applied Mathematics , 2012, DOI: 10.5402/2012/598539
The Study of a Class of Pest Control Pollution Model with Stage-Structure and Time Delay
Jianwen Jia,Bo Wu
ISRN Applied Mathematics , 2012, DOI: 10.5402/2012/598539
Abstract: We construct a pest control pollution model with stage-structure for pests and with epidemic in the predator by spraying pesticides and releasing susceptible predators together. We assume that only the pests and infective predators are affected by pesticide. We show that there exists a globally attractive pest-extinction periodic solution and we get the condition of global attractiveness of the pest-extinction periodic solution by applying comparison theorem of impulsive differential equation. Further, the condition for the permanence of the system is also given. 1. Introduction With the rapid development of modern technology, industry, and agriculture, it is of great interest to consider the effects of toxicant on ecological communities from both an environmental and conservational point of view. Qualitatively estimating the effect of a toxicant on a population by mathematical models is a relatively new field that began only in the early 1980s [1–3]. Population toxicant coupling has been applied in several contexts including Lotka-Volterra and chemostat-like environments, resulting in ordinary, integrodifferential, and impulsive differential equation and stochastic models. So in this paper, we consider the above effects and introduce the pollution model to model the process of pest control problems and study its dynamics, and this is different from the previous pest control model which assumed that pests were reduced proportionally by spraying pesticides [4–6]. In the natural world, many species have a life history that takes their individual members through two stages: immature and mature; the authors of [7] studied an ecological model with stage-structure for predator. A general functional response was considered, and the authors analyzed the stability and the permanence of the system. The authors [8, 9] analyzed prey-predator models with age structure and impulsive control. The authors [10] investigated the dynamics of a pest control model with age structure for pests by introducing a constant periodic pesticide input and releasing natural enemies at different fixed moments. they analyzed the conditions for the global attractivity of the pest-extinction periodic solution and the permanence of the system. Modeling studies on disease-dominated ecological populations have addressed issues like disease-related mortality, reduction in reproduction, change in population sizes, and disease-induced oscillation of population states. Chattopadhyay and Arino [11] formulated a prey-predator model with prey infection and observed destabilization due to
On Diophantine quintuple Conjecture
Wenquan Wu,Bo He
Mathematics , 2014, DOI: 10.3792/pjaa.90.84
Abstract: In this note, we prove that if $\{a,b,c,d,e\}$ with $a
Functional inequalities on path space over a non-compact Riemannian manifold
Xin Chen,Bo Wu
Mathematics , 2013,
Abstract: We prove the existence of the O-U Dirichlet form and the damped O-U Dirichlet form on path space over a general non-compact Riemannian manifold which is complete and stochastically complete. We show a weighted log-Sobolev inequality for the O-U Dirichlet form and the (standard) log-Sobolev inequality for the damped O-U Dirichlet form. In particular, the Poincar\'e inequality (and the super Poincar\'e inequality) can be established for the O-U Dirichlet form on path space over a class of Riemannian manifolds with unbounded Ricci curvatures. Moreover, we construct a large class of quasi-regular local Dirichlet forms with unbounded random diffusion coefficients on the path space over a general non-compact manifold.
Characterization of non-constant lower bound of Ricci curvature via entropy inequality on Wasserstein space
Jinghai Shao,Bo Wu
Mathematics , 2015,
Abstract: When the Ricci curvature of a Riemannian manifold is not lower bounded by a constant, but lower bounded by a continuous function, we give a new characterization of this lower bound through the convexity of relative entropy on the probability space over the Riemannian manifold. Hence, we generalize K.T. Sturm and von Renesse's result (Comm. Pure Appl. Math. 2005) to the case with non-constant lower bound of Ricci curvature.
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