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Search Results: 1 - 10 of 80849 matches for " Baoxiang Liu "
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Sharp global well-posedness for non-elliptic derivative Schr?dinger equations with small rough data
Baoxiang Wang
Mathematics , 2010,
Abstract: We show the sharp global well posedness for the Cauchy problem for the cubic (quartic) non-elliptic derivative Schr\"odinger equations with small rough data in modulation spaces $M^s_{2,1}(\mathbb{R}^n)$ for $n\ge 3$ ($n= 2$). In 2D cubic case, using the Gabor frame, we get some time-global dispersive estimates for the Schr\"odinger semi-group in anisotropic Lebesgue spaces, which include a time-global maximal function estimate in the space $L^2_{x_1}L^\infty_{x_2,t}$. By resorting to the smooth effect estimate together with the dispersive estimates in anisotropic Lebesgue spaces, we show that the cubic hyperbolic derivative NLS in 2D has a unique global solution if the initial data in Feichtinger-Segal algebra or in weighted Sobolev spaces are sufficiently small.
Global well posedness and scattering for the elliptic and non-elliptic derivative nonlinear Schrodinger equations with small data
Baoxiang Wang
Mathematics , 2008,
Abstract: We study the Cauchy problem for the generalized elliptic and non-elliptic derivative nonlinear Schrodinger equations, the existence of the scattering operators and the global well posedness of solutions with small data in Besov spaces and in modulation spaces are obtained. In one spatial dimension, we get the sharp well posedness result with small data in critical homogeneous Besov spaces. As a by-product, the existence of the scattering operators with small data is also shown. In order to show these results, the global versions of the estimates for the maximal functions on the elliptic and non-elliptic Schrodinger groups are established.
Ill-posedness for the Navier-Stokes equations in critical Besov spaces $\dot B^{-1}_{\infty,q}$
Baoxiang Wang
Mathematics , 2014,
Abstract: We study the Cauchy problem for the incompressible Navier-Stokes equation \begin{align} u_t -\Delta u+u\cdot \nabla u +\nabla p=0, \ \ {\rm div} u=0, \ \ u(0,x)= \delta u_0. \label{NS} \end{align} For arbitrarily small $\delta>0$, we show that the solution map $\delta u_0 \to u$ in critical Besov spaces $\dot B^{-1}_{\infty,q}$ ($\forall \ q\in [1,2]$) is discontinuous at origin. It is known that the Navier-Stokes equation is globally well-posed for small data in $BMO^{-1}$. Taking notice of the embedding $\dot B^{-1}_{\infty,q} \subset BMO^{-1}$ ($q\le 2$), we see that for sufficiently small $\delta>0$, $u_0\in \dot B^{-1}_{\infty,q} $ ($q\le 2$) can guarantee that the Navier-Stokes equation has a unique global solution in $BMO^{-1}$, however, this solution is instable in $ \dot B^{-1}_{\infty,q} $ and the solution can have an inflation in $\dot B^{-1}_{\infty,q}$ for certain initial data. So, our result indicates that two different topological structures in the same space may determine the well and ill posedness, respectively.
Study on kinetics of hydrocarbon generation from coals in the Qinshui Basin
Duan Yi,Wu Baoxiang,Zheng Chaoyang,Wang Chuanyuan,Zhang Hui,Tao Mingxin,Liu Jinzhong,Zhang Xiaojun
Chinese Science Bulletin , 2005, DOI: 10.1360/04wd114
Abstract: A new method for the quantitative assessment of hydrocarbon generation potential from coals by means of the chemical reaction kinetics has been developed gradually over the recent years. In this paper, the kinetic parameters of hydrocarbon gas generation are determined by high temperature and pressure, and closed- system thermal simulation for Late Paleozoic coals in the Qinshui Basin and the kinetic characteristics and the histories of hydrocarbon gas generation were studied using the parameters obtained. Results show that during the longer period from the Triassic (T) to the Middle Jurassic (J2), the coal-derived methane yield increased more slowly under lower palaeogeotemperature in the Qinshui Basin; however, the shorter period from Late Jurassic to Early Cretaceous, the coal-derived methane yield increased more rapidly under higher palaeogeotemperature. The correlation between the thermal simulation and the factual data shows that C1/ (C1+C2 4) coefficients computed by the histories of methane and C2-C4 hydrocarbon generation can provide evidence for the identification of the genesis of coal bed gas in the different areas of the Qinshui Basin. The kinetic simulating experiment of hydrocarbon generation for the peat considered as the original matter of coal formation was performed for the first time and the simulated results were compared with the characteristics of hydrocarbon generation from coals undergoing various palaeogeotemperature in the Qinshui Basin. The result indicates that the peat has a higher potential of hydrocarbon generation than that of coals. Therefore, the hydrocarbon generation results obtained from kinetic simulation for coal with higher maturation rank could not stand for their original hydrocarbon generation potential and thus would lead to an underestimation for coal-bed gas resource. The generative amount of coal-derived gas in the Qinshui Basin was predicted using kinetic simulation results for the peat and their maximum was estimated. The calculation shows that the generative amount of coal-derived gas from Taiyuan Formation and Shanxi Formation coal-beds in the Qinshui Basin is the highest in Yangcheng area, higher in Qinyuan area and the lowest in Huoshan area. Therefore, the conditions of coal-bed gas generation are the best in Yangcheng area, the second in Qinyuan area and not very good in Huoshan area.
Study of Hail with C B and Dual Linear Polarization Radar

Liu Liping,Xu Baoxiang,Wang Zhijun and,

大气科学 , 1992,
Abstract: This paper presents the calculations of the scattering properties of hydrometeors with different shapes and phases. Based on these properties and ZDR features of rain and clond echos, the dual linear polarization radar RHI data observed during hailstorm processes on August 9 and August 30, 1990 are analysed . We deduced that the area with negative ZDR values corresponded to hail shafts where may appear large oblate hailstones and small conical hailstones, and the area with great positive Z D R values corresponded to raining area . The Z D R greater than 5dB was caused by huge raindrops (D>0.5cm). It is possible to detect the presence of hail using ZDR as a criterion. Compared with a S-band radar, the C-band dual linear polarization radar is unique in several aspects : the Z DR values are larger in raining area and smaller and negative in hail shooting area , which are useful for the study of microphysics and spatial structure of storms. The dual linear polarization radar will be impartant to cloud physics and weather modification .
The Realization of Phonetic Fuzzy Query in Information Management System

Yan GongCan,Liu BaoXiang,Li LiGong,

计算机系统应用 , 2006,
Abstract: 本文详细讨论了信息管理系统中实现语音模糊查询的三个关键技术:获得汉字拼音数据字典,创建高效安全的汉字拼音数据库,设计和实现可靠的同音字检索算法。并给出了基于VB环境具体实现的核心代码。
Regional Difference and Regional Convergence of Cultivated Land Conversion in China

LIU Lijun,SONG Min,QU Baoxiang,

资源科学 , 2009,
Abstract: 当前中国大部分省份所处的经济发展阶段不同,对土地的需求也不尽相同,耕地非农化的规模和程度也必然存在一定的区域差异。本文主要利用基尼系数、希尔系数、变异系数、Moran I等指标与方法,对我国耕地非农化的区域格局、区域差异的来源及构成、区域收敛的可能性与收敛特征等问题进行分析。结果表明:我国耕地非农化的区域差异较大,耕地非农化的规模和程度基本上呈东、中、西依次递减的空间格局;现阶段我国耕地非农化的全局区域收敛不存在,主要表现为局部收敛,尤其是中东部地区的局部收敛,包括浙江、山东、江苏、河北、河南、安徽等省份;此外,区域经济增长的σ发散与耕地非农化的发散具有协同性。最后提出应通过优化区域经济的产业布局,加强耕地非农化的区域调控力度,实现经济增长与耕地保护的协调发展。
SCP-Trust Reasoning Strategy Based on Preference and Its Service Composition Process of Context-Aware Process  [PDF]
Xiaona Xia, Jiguo Yu, Baoxiang Cao
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.29006

Before providing services to the user, user preference considerations are the key conditions to achieve the self-adaptive decision-making about service selection and composition process, which is the flexible concerned aspect provided by massive cloud computing environment data. Meanwhile, during the whole services’ providing process, achieving the capturing and forming of service aggregation units’ topology logic, building the context environment’s process-aware of service composition, ensuring the trust and adaptation among service aggregation units, which are the important reasons to express timely requirement preference. This paper designs SCP-Trust Reasoning strategy about the integration of user preference and trust, with process algebra, it is to achieve the context process-aware logic for service composition process, in order to improve the autonomous optimization and evolution of service implementation system.

Activities of Aspartate Aminotransferase, Alanine Aminotransferase, Gamma-Glutamyltransferase, Alkaline Phosphatase in Plasma of Postpartum Holstein Cows
Ping Liu,BaoXiang He,XianLing Yang,XiaoLu Hou,HaiYang Zhao,YinHua Han,Pei Nie,HuiFang Deng,Long Cheng
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.1270.1274
Abstract: Depressed appetite and reduced Dry Matter Intake (DMI) and feeding energy-dense diets for a long time around parturition of cows may lead to excessive lipid mobilization which causes the liver damage. This study was meant to determine the effects of postpartun enzymes metabolic status in Holstein cows. In this study, blood samples were during the whole experimental period, obtained from the jugular venepuncture from each animal on 1 week prepartum (week 1), days delivery (week 0) and 1st 9 weeks postpartum (week 1-9). They were analyzed for examining Aspartate aminotransferase (AST), Alanine Aminotransferase (ALT), Gamma-Glutamyltransferase (GGT), Alkaline Phosphatase (ALP) activity. The resultes showed a higher activity of AST which was determined in the 1-3 weeks than other s. ALT activity indicated a statistically significant increase from the 5-7 weeks of lactation and activity in the 7th week postpartum periods significally reached to the peak. GGT activity in the antepartum 1 week until delivery day was significally lower in comparison with the first to reach the 9th weeks postpartum. ALP activity in the delivery day and 6-8 weeks significant increased in process. Therefore, the AST, ALT, GGT and ALP of enzyme activity which could be used significantly change in the blood plasma of Holstein.
刘黎平 Liu Liping,徐宝祥 Xu Baoxiang,王致君 Wang Zhijun,等 et al
大气科学 , 1992, DOI: 10.3878/j.issn.1006-9895.1992.03.14
Abstract: 本文计算了不同相态、不同形状的降水粒子对5.6cm,10.7cm雷达波的散射特性,并利用降水粒子散射特性及云雨雷达回波的Z_(DR)特征并结合地面降雹情况,分析并解释了1990年8月9日和8月30日甘肃省平凉两次雹暴过程的雷达RHI资料.我们推测:Z_(DR)值为负值的区域相应于降雹区,ZDR负值与大扁冰雹和小锥状冰雹关系密切;而雨区Z_(DR)具有较大正值,雨区大于5dB的Z_(DR)由直径D>0.5cm的雨滴所致.利用冰雹区和雨区Z_(DR)信息的不同可能识别降水粒子的相态.C波段双线偏振雷达和10cm波长雷达相比有独到之处:雨区Z_(DR)值较大,而冰雹区Z_(DR)值又较小,这更有利于研究云雨相态和空间结构.可以预期双线偏振雷达对防雹工作及云物理研究工作是有很大帮助的.
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