Regional integrated environmental model system and its simulation of East Asia summer monsoon

A continuous 22-year simulation in Asia for the period of 1 January 1979 to 31 December 2000 was conducted using the Regional Integrated Environmental Model System （RIEMS 2.0） with NCEP Reanalysis II data as the driving fields. The model processes include surface physics state package （BATS le）, a Grell cumulus parameterization, and a modified radiation package （CCM3） with the focus on the ability of the model to simulate the summer monsoon over East Asia. The analysis results show that （1） RIEMS reproduces well the spatial pattern and the seasonal cycle of surface temperature. When regionally averaged, the summer mean temperature biases are within 1-2℃（2） For precipitation, the model reproduces well the spatial pattern, and temporal evolution of the East Asia summer monsoon rain belt, with steady phases separated by more rapid transitions, is reproduced. The rain belt simulated by RIEMS 2.0 is closer to observation than by RIEMS 1.0. （3） RIEMS 2.0 can reasonably reproduce the large-scale circulation.     

Testing the ability of RIEMS2.0 to simulate multi-year precipitation and air temperature in China

RIEMS2.0 （Regional Integrated Environment Modeling System, Version 2.0） is now being developed starting from RIEMS1.0 by the Key Laboratory of Regional Climate Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, China. In order to test RIEMS2.0’s ability to simulate long-term climate and its changes, as well as provide a basis for further development and applications, we compare simulated precipitation and air temperature from 1980 to 2007 （simulation duration from Jan. 1, 1979 to Dec. 31, 2007） under different cumulus parameterization schemes with the observed data. The results show that RIEMS2.0 can reproduce the spatial distribution of precipitation and air temperature, but that the model overestimates precipitation with the rainfall center moving northwestward and underestimates air temperature for annual simulations. Annual and interannual variations in precipitation and air temperature for different climate subregions are well captured by the model. Further analysis of summer and winter simulations shows that precipitation is overestimated, except for the Jianghuai-Jiangnan subregions in the winter, and the air temperature bias in the summer is weaker than in the winter. There are larger biases for precipitation and air temperature in semiarid subregions. Anomalies in precipitation and air temperature are also well captured by the model. Although a similar distribution can be found between observed data and simulated results under different cumulus parameterization schemes, these show differences in intensity and location. In sum, RIEMS2.0 shows good stability and does well in simulating the long-term climate and its changes in China.     

基于MODELICA的采摘机械手运动控制建模

多领域物理系统建模的Modelica语言适合求解常微分方程和微分代数方程,但对多变量函数的偏微分方程和分布式参数求解困难.针对水果采摘机械手运动控制的多变量函数和非线性的复杂不确定问题,采用基于Modelica的虚拟设计方法,提出用Laplace变换把多变量函数的偏微分方程转换成传递函数的算法,给出了机电运动控制的数学模型和耦合关系,设计机器人的本体结构模型,构建了机械手的DriveLib模型库.最后以机械手的单轴控制为例进行仿真,验证了模型的有效性,为机械手设计提供了理论依据.     

基于数据仓库的销售数据可视化分析系统

为了辅助销售管理者充分利用已有的历史销售数据,快速直观地捕获敏感数据,及时准确地把握市场行情,研究了以数据仓库为分析平台,根据销售数据具有的地理特征,结合Google 提供的Google Maps API（Application Program Interface）,将OLAP（Online Analytical Processing）的分析操作映射到地图具有的交互操作上的可视化分析系统。并基于实际案例着重设计并优化了数据仓库架构,为系统应用开发奠定了良好的基础。实践证明,系统有效提高了销售管理部门的统筹决策的效率及能力,为企业创造了更大的经济效益。     

图书馆网络系统安全与数据安全问题

随着计算机网络技术的广泛应用,计算机系统的安全保护工作也越来越值得关注,因此,国务院在1994年的文件中就明确下达了建立健全计算机信息系统安全的工作指示。由此可见,依赖网络技术而构建起来的数字图书馆的信息安全问题也将是情报界学者反复探讨和研究的重点。数据的安全性和系统的稳定性,是保障数字图书馆正常工作的基础。     

图书馆面临突发事件和危机时作出的措施

本文通过汶川大地震,阐述了图书馆应急管理的重要性。结合实例提出了图书馆应急管理的几点建议。     

MCNP计算用ADS截面库ADSlib2.0的制作

加速器驱动洁净核能系统(简称ADS)使用高能散裂中子驱动次临界反应堆,用于嬗变长寿命高放废物(LHW).ADS次临界反应堆中子能量较高,使用传统的ENDF截面数据库对ADS堆芯物理计算存在着能量上限低、部分数据缺失等问题.本文使用MAKXSF程序对IAEA-ADS截面数据库ADS Nuclear Data Library进行了加工,制作出专用于MCNP计算用的截面库ADSlib2.0,并与ENDF/B-VII.0,JEFF-3.1和JENDL-4.0库中238U裂变截面的比较,表明该截面数据库是可用的.     

基于“云计算”的数字图书馆服务模式

云计算是继网格技术后产生的新型计算模式,它的出现不仅仅是一种2.0时代的附属品,而是一场互联网时代的巨大改变。本文从云计算的概念入手,分析数字图书馆应用云计算的可行性,并根据云计算的特征和构成数字图书馆服务模式的要素从不同角度探讨了基于云计算环境下的一站式服务模式、平台服务模式、个性化服务模式、资源共建共享服务模式的云数字图书馆服务模式。     

Web2.0环境下的图书馆信息服务

对Web2．0的概念及相关技术进行综述,调研Web2．0技术在部分图书馆的应用现状,探讨运用Web2．0技术,利用其互动性、参与性、开放性的特点,应对图书馆信息服务在网络环境中面临的挑战,并分析其应用中存在的问题及未来的发展趋势。     

云计算影响下的图书馆

云计算在引领着互联网的发展趋势,数字化图书馆进程也不可避免的受到影响。本文在介绍云计算概念、概括云计算技术特点的基础上,探讨了云计算技术在图书馆中的应用及相关问题。