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利用我国高速信息公路,设计了一个全国统一的建筑工程预(结)算和数据处理系统,该系统可以支持网络的局部应用和分布式数据库的全局应用。 相似文献
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本文以我国公民科学素质水平不高为切入点,结合国内外科普场馆发展现状,提出在深入贯彻科学发展观的框架下,加强科普场馆建设的主要任务及措施.进而阐述加强科普场馆建设的必要性与必然性。 相似文献
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金属锰渗氮及热力学分析 总被引:6,自引:0,他引:6
应用真空电阻炉高温渗氮、X射线衍射、惰气熔融法氧氮分析等实验测试方法 ,研究了粒度、渗氮时间等因素对金属锰渗氮的影响。粒度愈小 ,渗氮速度愈快。随渗氮时间的延长 ,除发生微量氧化生成MnO外 ,金属锰可全部氮化为Mn4 N和少量Mn2 N .应用规则溶液模型和有关研究报道计算得到 ζ相 (计量组成为Mn4 N )的生成自由能 :ΔG0 Mn4 N =- 110 85 0 (±30 0 0 ) + 6 4.714 (± 2 .2 )T(J/mol) . 相似文献
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当前虚拟着装工具大多采用WIMP界面,操作复杂,难以学习.而手绘界面是一种更简单、快速的交互方式,更适合概念设计.本文设计并实现了基于草绘和手势的着装原型系统.用户通过手绘的方式直接在3D虚拟角色模型上勾画出衣服轮廓线.系统采用基于尺度空间的角点检测方法准确地预处理和分割轮廓线.利用衣服轮廓线到模型之间的距离推算衣服内部网格点到模型之间的距离信息,由此构建衣服曲面.为加速计算距离值,通过对距离场信息建立索引改进了其存储和访问效率.同时该原型系统允许用户使用手势对衣服轮廓线进行编辑,并且设计和实现了手势训练 相似文献
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In the past decade,Fusarium mycotoxins as main biological contaminants in foods have attracted increasing attention due to their agro-economic importance across the global food chain.Their chemical structural diversities and occurance in a variety of foods make it chanllenging to simultaneously and efficiently extract them for further analysis.On the other hand,although various analytical methods have been widely applied for on-site and in-lab tests for rapid screening and/or quantitative determination,risk assessment of Fusarium mycotoxins is hardly performed due to the unavailability of affordable mycotoxin standards,as well as the lack of data of dietary consumption and food contamination.Meanwhile,there is an increasing demand for effective control of mycotoxins regarding prevention,neutralization,clearance,detoxification approaches using physico-chemical and biological means.This review summarizes advances in the analysis and control of Fusarium mycotoxins in contaminated foods,providing valuable insights and references for subsequent studies on development of analytical methodology,control strategies,as well as regulations of food safety made by policy-makers. 相似文献
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