OWS(OGC Web Service)为空间数据共享提供了可行的方法,但如何在浩瀚的互联网上快速、准确地查询到符合用户需要的OWS是一件比较困难的事情。在对Web搜索方法进行深入理解的基础上,提出一种基于全文检索搜索引擎搭建OWS索引服务的思路,...OWS(OGC Web Service)为空间数据共享提供了可行的方法,但如何在浩瀚的互联网上快速、准确地查询到符合用户需要的OWS是一件比较困难的事情。在对Web搜索方法进行深入理解的基础上,提出一种基于全文检索搜索引擎搭建OWS索引服务的思路,并采用Google实现了OWS索引服务中心的原型系统,该系统可以为互联网用户提供OWS搜索服务。展开更多
随着网络技术的不断成熟,许多新技术成功地运用到GIS系统的客户端数据展现当中,而最引人注目的技术就是A-JAX;另一方面,开放地理信息系统联盟(OGC)开发了一系列基于Web服务技术的地理空间数据互操作协议OGC Web Services(OWS),其中的Web...随着网络技术的不断成熟,许多新技术成功地运用到GIS系统的客户端数据展现当中,而最引人注目的技术就是A-JAX;另一方面,开放地理信息系统联盟(OGC)开发了一系列基于Web服务技术的地理空间数据互操作协议OGC Web Services(OWS),其中的Web Map Services(WMS)已经广泛地应用于GIS领域。本文首先对于AJAX技术和OWS规范进行基础性的阐述,之后将详细介绍一个结合AJAX技术和OWS规范构造的GIS系统—ACT-GIS。展开更多
In this paper, the problem of finding exact solutions to the magnetohydrodynamic(MHD) equations in the presence of incompressible mass flows with helical symmetry is considered. For ideal flows, a similarity reduction...In this paper, the problem of finding exact solutions to the magnetohydrodynamic(MHD) equations in the presence of incompressible mass flows with helical symmetry is considered. For ideal flows, a similarity reduction method is used to obtain exact solutions for several MHD flows with nonlinear variable Mach number. For resistive flows parallel to a magnetic field, the governing equilibrium equation is derived. The MHD equilibrium state of a helically symmetric incompressible flow is governed by a second-order elliptic partial differential equation(PDE) for the helical magnetic flux function. Exact solutions for the latter equation are obtained. Also, the equilibrium equations of a gravitating plasma with incompressible flow are derived.展开更多
Scientific workflows have gained the emerging attention in sophisti-cated large-scale scientific problem-solving environments.The pay-per-use model of cloud,its scalability and dynamic deployment enables it suited for ex...Scientific workflows have gained the emerging attention in sophisti-cated large-scale scientific problem-solving environments.The pay-per-use model of cloud,its scalability and dynamic deployment enables it suited for executing scientific workflow applications.Since the cloud is not a utopian environment,failures are inevitable that may result in experiencingfluctuations in the delivered performance.Though a single task failure occurs in workflow based applications,due to its task dependency nature,the reliability of the overall system will be affected drastically.Hence rather than reactive fault-tolerant approaches,proactive measures are vital in scientific workflows.This work puts forth an attempt to con-centrate on the exploration issue of structuring a nature inspired metaheuristics-Intelligent Water Drops Algorithm(IWDA)combined with an efficient machine learning approach-Support Vector Regression(SVR)for task failure prognostica-tion which facilitates proactive fault-tolerance in the scheduling of scientific workflow applications.The failure prediction models in this study have been implemented through SVR-based machine learning approaches and the precision accuracy of prediction is optimized by IWDA and several performance metrics were evaluated on various benchmark workflows.The experimental results prove that the proposed proactive fault-tolerant approach performs better compared with the other existing techniques.展开更多
Considering the influence of the streaming potential and electroviscous effects, the analytical solutions for electromagnetohydrodynamic (EMHD) flows in parallel plate microchannels are obtained. The electrolyte solut...Considering the influence of the streaming potential and electroviscous effects, the analytical solutions for electromagnetohydrodynamic (EMHD) flows in parallel plate microchannels are obtained. The electrolyte solutions in the microchannels are taken as generalized Maxwell fluids, and slip boundary conditions are adopted. To accurately analyze the EMHD flow characteristics, the variation trends of the electroviscous effects with the corresponding parameters must be understood. The results show that the electroviscous effects increase with the increase in the relaxation time De, the slip coefficient , and the wall zeta potential 0. However, the increase in the inverse of the electrical double-layer (EDL) thickness K, the electrical oscillating Reynolds number Re, and the ionic P'eclet number Pe can decrease the electroviscous effects. We also demonstrate that the electroviscous effect on the EMHD flows of generalized Maxwell fluids is larger than that of Newtonian fluids. This work will be useful in designing EMHD flows in parallel plate microchannels.展开更多
OGC Web Map Service is one kind of OGC Portrayal Services belongs to OGC Web Service model and it provides multi\|platform interoperability of spatial data set.This paper presents a method for implementing OGC Web Map...OGC Web Map Service is one kind of OGC Portrayal Services belongs to OGC Web Service model and it provides multi\|platform interoperability of spatial data set.This paper presents a method for implementing OGC Web Map Service based on Web Service technique and introduces the detailed process.展开更多
[Objective] We aimed to investigate the preventive and therapeutical effect of compound of traditional Chinese drugs （Japanese raisintree fruit, lobed kudzuvine flower bud and lightyel ow sophora root） on acute alc...[Objective] We aimed to investigate the preventive and therapeutical effect of compound of traditional Chinese drugs （Japanese raisintree fruit, lobed kudzuvine flower bud and lightyel ow sophora root） on acute alcohol intoxication in mice. [Method] Acute alcohol intoxication was induced by administering alcohol to mice. Three different doses （low, middle and high） of compound of traditional Chinese drugs were administered to mice before and after administering alcohol respectively to investigate the preventive and therapeutical effect of drugs on acute alcohol intox-ication through doing statistical analysis about drunk mice and their sleeping time. The concentration of malondialdehyde （MDA）, reduced glutathione （GSH） and triglyc-erides （TG） in liver was also determined to investigate the protective effect of drugs on liver. [Result] The efficacy of compound of traditional Chinese drugs on acute al-cohol intoxication was dose-dependent. High-dose administration decreased the number of drunk mice significantly compared with control group; middle- and high-dose administration reduced the sleeping time of drunk mice and the concentration of MDA and TG in liver tissue; three doses al increased the concentration of GSH. [Conclusion] The compound of Japanese raisintree fruit, lobed kudzuvine flower bud and lightyel ow sophora root had preventive and therapeutical effect on hangover, and it also had certain preventive and therapeutical effect on liver damage caused by alcohol.展开更多
云GIS环境下,利用空间数据的首要问题是解决分布式多源异构空间数据的集成问题。云计算环境下,空间数据通过Web Service的形式实现标准化、同构化,为进一步集成应用奠定基础,而OGC Web Service(OWS)的空间数据服务规范被广泛认可和使用...云GIS环境下,利用空间数据的首要问题是解决分布式多源异构空间数据的集成问题。云计算环境下,空间数据通过Web Service的形式实现标准化、同构化,为进一步集成应用奠定基础,而OGC Web Service(OWS)的空间数据服务规范被广泛认可和使用。首先研究了基于OWS空间数据服务规范的空间数据源模式;然后设计并实现了基于OWS空间数据服务规范的空间数据集成,包括WFS空间数据服务的集成模式设计、集成数据分片条件判断、集成模式构建以及集成算法的实现;最后以河北省某市2个县的土地利用数据为例实现了云计算环境下基于OWS服务的分布式空间数据区域集成和专题集成。展开更多
文摘OWS(OGC Web Service)为空间数据共享提供了可行的方法,但如何在浩瀚的互联网上快速、准确地查询到符合用户需要的OWS是一件比较困难的事情。在对Web搜索方法进行深入理解的基础上,提出一种基于全文检索搜索引擎搭建OWS索引服务的思路,并采用Google实现了OWS索引服务中心的原型系统,该系统可以为互联网用户提供OWS搜索服务。
文摘随着网络技术的不断成熟,许多新技术成功地运用到GIS系统的客户端数据展现当中,而最引人注目的技术就是A-JAX;另一方面,开放地理信息系统联盟(OGC)开发了一系列基于Web服务技术的地理空间数据互操作协议OGC Web Services(OWS),其中的Web Map Services(WMS)已经广泛地应用于GIS领域。本文首先对于AJAX技术和OWS规范进行基础性的阐述,之后将详细介绍一个结合AJAX技术和OWS规范构造的GIS系统—ACT-GIS。
文摘In this paper, the problem of finding exact solutions to the magnetohydrodynamic(MHD) equations in the presence of incompressible mass flows with helical symmetry is considered. For ideal flows, a similarity reduction method is used to obtain exact solutions for several MHD flows with nonlinear variable Mach number. For resistive flows parallel to a magnetic field, the governing equilibrium equation is derived. The MHD equilibrium state of a helically symmetric incompressible flow is governed by a second-order elliptic partial differential equation(PDE) for the helical magnetic flux function. Exact solutions for the latter equation are obtained. Also, the equilibrium equations of a gravitating plasma with incompressible flow are derived.
文摘Scientific workflows have gained the emerging attention in sophisti-cated large-scale scientific problem-solving environments.The pay-per-use model of cloud,its scalability and dynamic deployment enables it suited for executing scientific workflow applications.Since the cloud is not a utopian environment,failures are inevitable that may result in experiencingfluctuations in the delivered performance.Though a single task failure occurs in workflow based applications,due to its task dependency nature,the reliability of the overall system will be affected drastically.Hence rather than reactive fault-tolerant approaches,proactive measures are vital in scientific workflows.This work puts forth an attempt to con-centrate on the exploration issue of structuring a nature inspired metaheuristics-Intelligent Water Drops Algorithm(IWDA)combined with an efficient machine learning approach-Support Vector Regression(SVR)for task failure prognostica-tion which facilitates proactive fault-tolerance in the scheduling of scientific workflow applications.The failure prediction models in this study have been implemented through SVR-based machine learning approaches and the precision accuracy of prediction is optimized by IWDA and several performance metrics were evaluated on various benchmark workflows.The experimental results prove that the proposed proactive fault-tolerant approach performs better compared with the other existing techniques.
基金Project supported by the National Natural Science Foundation of China(Nos.11772162 and11472140)the Inner Mongolia Autonomous Region Grassland Talent of China(No.12000-12102013)the Natural Science Foundation of Inner Mongolia Autonomous Region of China(No.2016MS0106)
文摘Considering the influence of the streaming potential and electroviscous effects, the analytical solutions for electromagnetohydrodynamic (EMHD) flows in parallel plate microchannels are obtained. The electrolyte solutions in the microchannels are taken as generalized Maxwell fluids, and slip boundary conditions are adopted. To accurately analyze the EMHD flow characteristics, the variation trends of the electroviscous effects with the corresponding parameters must be understood. The results show that the electroviscous effects increase with the increase in the relaxation time De, the slip coefficient , and the wall zeta potential 0. However, the increase in the inverse of the electrical double-layer (EDL) thickness K, the electrical oscillating Reynolds number Re, and the ionic P'eclet number Pe can decrease the electroviscous effects. We also demonstrate that the electroviscous effect on the EMHD flows of generalized Maxwell fluids is larger than that of Newtonian fluids. This work will be useful in designing EMHD flows in parallel plate microchannels.
基金Funded by the Nationtal“863”Project(NO.2002AA131030).
文摘OGC Web Map Service is one kind of OGC Portrayal Services belongs to OGC Web Service model and it provides multi\|platform interoperability of spatial data set.This paper presents a method for implementing OGC Web Map Service based on Web Service technique and introduces the detailed process.
基金Supported by National Natural Science Foundation of China(31100987)Project of Shandong University of Technology(4040-306018)Young Teacher Development Plan of Shandong University of Technology~~
文摘[Objective] We aimed to investigate the preventive and therapeutical effect of compound of traditional Chinese drugs （Japanese raisintree fruit, lobed kudzuvine flower bud and lightyel ow sophora root） on acute alcohol intoxication in mice. [Method] Acute alcohol intoxication was induced by administering alcohol to mice. Three different doses （low, middle and high） of compound of traditional Chinese drugs were administered to mice before and after administering alcohol respectively to investigate the preventive and therapeutical effect of drugs on acute alcohol intox-ication through doing statistical analysis about drunk mice and their sleeping time. The concentration of malondialdehyde （MDA）, reduced glutathione （GSH） and triglyc-erides （TG） in liver was also determined to investigate the protective effect of drugs on liver. [Result] The efficacy of compound of traditional Chinese drugs on acute al-cohol intoxication was dose-dependent. High-dose administration decreased the number of drunk mice significantly compared with control group; middle- and high-dose administration reduced the sleeping time of drunk mice and the concentration of MDA and TG in liver tissue; three doses al increased the concentration of GSH. [Conclusion] The compound of Japanese raisintree fruit, lobed kudzuvine flower bud and lightyel ow sophora root had preventive and therapeutical effect on hangover, and it also had certain preventive and therapeutical effect on liver damage caused by alcohol.
文摘云GIS环境下,利用空间数据的首要问题是解决分布式多源异构空间数据的集成问题。云计算环境下,空间数据通过Web Service的形式实现标准化、同构化,为进一步集成应用奠定基础,而OGC Web Service(OWS)的空间数据服务规范被广泛认可和使用。首先研究了基于OWS空间数据服务规范的空间数据源模式;然后设计并实现了基于OWS空间数据服务规范的空间数据集成,包括WFS空间数据服务的集成模式设计、集成数据分片条件判断、集成模式构建以及集成算法的实现;最后以河北省某市2个县的土地利用数据为例实现了云计算环境下基于OWS服务的分布式空间数据区域集成和专题集成。
