数控机床功能的扩展

本文主要分析了HEIDENHAIN TNC 310数控铣床系统中圆弧铣削指令及螺纹铣削指令,对螺纹铣削功能进行延伸,扩展到圆弧三轴联动,并对螺纹铣削指令格式进行了修改,从而具有圆弧三轴联动铣削功能。     

基于经济时空的中国林业产业发展路径

经济时间和经济空间是研究产业变迁的两个重要维度,就林业产业时空特性而言,中国林业产业的发展面临着时空分离和时空压缩的困境。在经济全球化进程中,林业产业要适应现代科技变革和产业变迁,必须寻求新的发展路径:实现林业产业的时空转换,拓宽林业产业的市场时空;提高林业产业技术,促进林业产业的时空延伸;优化林业产业布局,提高林业产业的时空效益。     

贾岛为僧及还俗时间地点考

贾岛出家及还俗的时间地点问题是贾岛生平仕历研究的一个重要问题。通过对现有史料记载以及贾岛等人诗文的考证分析,可知贾岛贞元九年(793)在北岳恒山出家为僧,时年15岁。后曾住洛阳石楼及嵩山一带。贞元十七年(801)在石楼与韩愈初次相识。元和六年(811)春在洛阳又遇到时任河南县令的韩愈,同年秋跟随韩愈赴长安准备应进士举,但并未马上还俗。冬十一月返回家乡范阳,处理僧俗事务。至迟于次年即元和七年(812)春还俗并参加进士考试,时年34岁。     

SBR工艺特点及SBR脱氮除磷技术

介绍了序批式活性污泥法(Sequencing Batch Reactor,简称SBR)工艺的产生、发展和特点以及目前脱氮除磷研究的主要进展。     

动静态属性数据相结合的客户分类方法研究

研究了一种客户动态、静态属性数据相结合的客户分类方法。提出了客户时间序列的加权处理方法,并应用客户时间序列的统计特征作为聚类特征向量,采用混合式遗传算法对客户聚类,使每一类客户具有相似的时序特征。在此基础上将聚类结果与客户的静态属性数据相结合,对客户进一步分类。实验结果表明,与传统的基于静态属性数据的客户分类方法相比,本文的方法提高了客户分类的准确性。     

Discrete time modelling of disease incidence time series by using Markov chain Monte Carlo methods

Summary.  A stochastic discrete time version of the susceptible–infected–recovered model for infectious diseases is developed. Disease is transmitted within and between communities when infected and susceptible individuals interact. Markov chain Monte Carlo methods are used to make inference about these unobserved populations and the unknown parameters of interest. The algorithm is designed specifically for modelling time series of reported measles cases although it can be adapted for other infectious diseases with permanent immunity. The application to observed measles incidence series motivates extensions to incorporate age structure as well as spatial epidemic coupling between communities.     

Detection and correction of artificial shifts in climate series

Summary.  Many long instrumental climate records are available and might provide useful information in climate research. These series are usually affected by artificial shifts, due to changes in the conditions of measurement and various kinds of spurious data. A comparison with surrounding weather-stations by means of a suitable two-factor model allows us to check the reliability of the series. An adapted penalized log-likelihood procedure is used to detect an unknown number of breaks and outliers. An example concerning temperature series from France confirms that a systematic comparison of the series together is valuable and allows us to correct the data even when no reliable series can be taken as a reference.     

RLC串并联电路的等效互换问题探讨

通过对RLC串并联电路的分析 ,推导出串并联电路等效互换后计算电路参数的统一表达式 ,并对两个元件的串并联电路等效互换进行了讨论。     

知识的价值决定——一种基于理论的探讨

劳动价值理论是经济学的基本理论。经济学价值论的使命是说明商品交换价值的决定和运动规律。新经济时代正在到来,人类生产方式也正在发生广泛而深刻的变化,价值决定理论也将随着现实经济的发展而发展。在知识经济时代,商品同样有一个客观的交换基础——劳动时间,但所有商品的价值已不完全由社会必要劳动时间确定,特别是知识产品的价值量是由个别劳动时间确定的。     

串联冰蓄冷系统设计中的泵能耗分析

介绍了串联冰蓄冷系统设计中泵能耗的3种节能方法：串联泵，变频泵和制冷机旁通，通过对某工程实例的模拟计算，对比分析了这3种方式的节能效果，提出了有效的节能方式。