基于Pro／Engineer的钣金类参数化设计研究

长期以来，我国企业的产品设计延续着一种改进型产品设计模式，导致了产品重复性操作，严重浪费了人力、财力和物力，制约了产品的创新。避免重复性劳动的智能化设计已势在必行，采用参数化软件Pro／Engineer是一个很好的选取择。在设计中，将骨架结构、几何形状等信息处理为易于控制的参数化变量．通过驱动参数化尺寸实现对设计结果的修改。通过这种方法来缩短相似产品再次的开发周期、降低成本。提高生产率。     

M2M大型装备远程监控

M2M产生于20世纪90年代中后期,以监控设备和资产为目标而产生.随着社会的不断发展和技术的不断进步,M2M不再是简单的数据在机器间的传输,更重要的是,它是机器与机器间智能化、交互式的通信.利用M2M网络实现大型装备的远程实时监控.对于企业和国家都越发重要.     

Discrete Euler processes and their applications

This paper introduces discrete Euler processes and shows their application in detecting and forecasting cycles in non‐stationary data where periodic behavior changes approximately linearly in time. A discrete Euler process becomes a classical stationary process if ‘time’ is transformed properly. By moving from one time domain to another, one may deform certain time‐varying data to non‐time‐varying data. With these non‐time‐varying data on the deformed timescale, one may use traditional tools to do parameter estimation and forecasts. The obtained results then can be transformed back to the original timescale. For datasets with an underlying discrete Euler process, the sample M‐spectrum and the spectra estimator of a Euler model (i.e., EAR spectral) are used to detect cycles of a Euler process. Beam response and whale data are used to demonstrate the usefulness of a Euler model. Copyright © 2008 John Wiley & Sons, Ltd.     

一种基于HLA Evovled的云仿真技术研究

针对现有HLA仿真资源难以与Internet共享使用的问题,借鉴云计算的思想,采用HLA Evolved相关的技术改进,提出了一种基于HLA Evolved的云仿真的体系结构和框架实现方案;研究了用于Web服务的RTI组件、模块化FOM/SOM对象模型和WSDL API函数等HLA Evolved技术,解决了基于多层语义的服务注册、发现、组合和平台的监控、预测及基于Hadoop的分布式存储、仿真技术;完成了一种战术通信网系统的云仿真测试实验,证明了基于HLA Evolved的云仿真设计方法的可行、有效。     

A Study of Value‐at‐Risk Based on M‐Estimators of the Conditional Heteroscedastic Models

In this paper, we investigate the performance of a class of M‐estimators for both symmetric and asymmetric conditional heteroscedastic models in the prediction of value‐at‐risk. The class of estimators includes the least absolute deviation (LAD), Huber's, Cauchy and B‐estimator, as well as the well‐known quasi maximum likelihood estimator (QMLE). We use a wide range of summary statistics to compare both the in‐sample and out‐of‐sample VaR estimates of three well‐known stock indices. Our empirical study suggests that in general Cauchy, Huber and B‐estimator have better performance in predicting one‐step‐ahead VaR than the commonly used QMLE. Copyright © 2011 John Wiley & Sons, Ltd.     

采区地质因素与生产能力间相关模型的灰色系统研究

本文应用灰色系统理论对贵州省水城矿务局木冲沟煤矿一采区地质因素特征指标进行定量化,并对采区地质因素特征指标与生产能力间的关系进行单因素分析,建立了木矿一采区生产能力与地质因素定量化指标间的关系模型,确定了最优的采区生产能力。图11,表1,参5。     

河北植物区系新资料

本文报道了３种和１变种河北新记录植物，它们是眼子菜属的蓼叶眼子菜ＰｏｔａｍｏｇｅｔｏｎｐｏｌｙｇｏｎｉｆｏｌｉｕｓＰｏｕｒｒ．和钝脊眼子莱Ｐ．ＯｃｔａｎｄｒｕｓＰｏｉｒ．ｖａｒ．ｍｉｄｕｈｉｋｉｍｏ（Ｍａｋｉｎｏ）Ｈａｒａ．水竹叶属的疣草Ｍｕｒｄａｎｎｉａｋｅｉｓａｋ（Ｈａｓｓｋ，）Ｈａｎｄ．－Ｍａｚｚ．和裸花水竹叶Ｍ．ｎｕｄｉｆｌｏｒａ（Ｌ．）Ｂｒｅｎａｎ．作者在秦皇岛市长寿山采到了朝鲜槐ＭａａｃｋｉａａｍｕｒｅｎｓｉｓＲｕｐｒ．ｅｔＭａｘｉｍ，为该种在河北有分布提供了直接证据．     

以3－缩甘油氧丙基三甲氧基硅烷交联制备PEG－20M玻璃毛细管柱

以ＰＥＧ－２０Ｍ为固定相，三氟化硼为催化剂，３－缩甘油氧丙基三甲氧基硅烷（简称ＫＨ－５６０）为交联剂，二氯甲烷为溶剂，对预先用氯化钠沉积法粗糙化的玻璃毛细管柱进行动态涂渍。涂渍好的柱在１５０℃恒温４ｈ进行交联。对交联柱的性能进行了严格的评价。     

河北省丝孢菌研究Ⅴ.节簇孢属、小枝双孢属和斯佩霉属

本文报道了作者近年来采自河北省的丝孢菌纲的3个国内新记录种,它们分别是节簇孢属(Gonatobotrys Cda)的简单节簇孢(G.simplex Cda),小枝双孢属(Diplocladiella Arnaud apud M.B.Ellis)的拟梯孢小枝双孢(D.scalarioides Arnaud apud M.B.Ellis)和斯佩霉属(Spegazzinia Sacc.)的四方斯佩霉(S.tessarthra(Berk.& Curt.)Sacc.)。节簇孢属和斯佩霉属系国内新纪录属,小枝双孢属在中国大陆首次报道。