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。     

大学计算机专业“基础原理”课的教学探讨

本文针对现代大学生学习计算机专业“基础原理”课程存在的种种客观问题,通过分析这些问题找出其中原因,并介绍对这些问题所采取的解决方案。教学实践表明,这些方案对学生学习“基础原理课”起到了较好的效果,提高了这类课程的教学质量。     

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。     

微型实验在农科大学基础化学实验中的探讨及应用实践

微型化学实验是化学领域的一次重大改革,是实现绿色化学的基础。文章阐述了微型化学实验的产生、特点和发展现状,并根据我校实际情况探讨了微型滴定分析法在农科大学基础化学实验中的应用实践。     

MODEL-ASSISTED HIGHER-ORDER CALIBRATION OF ESTIMATORS OF VARIANCE

In survey sampling, interest often centres on inference for the population total using information about an auxiliary variable. The variance of the estimator used plays a key role in such inference. This study develops a new set of higher‐order constraints for the calibration of estimators of variance for various estimators of the population total. The proposed strategy requires an appropriate model for describing the relationship between the response and auxiliary variable, and the variance of the auxiliary variable. It is therefore referred to as a model‐assisted approach. Several new estimators of variance, including the higher‐order calibration estimators of the variance of the ratio and regression estimators suggested by Singh, Horn & Yu and Sitter & Wu are special cases of the proposed technique. The paper presents and discusses the results of an empirical study to compare the performance of the proposed estimators and existing counterparts.     

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.     

高校实验室管理与评估

本文阐述了在评估工作的推动下 ,如何加强对实验人员队伍建设、建立和完善各种规章制度的管理 ,并对实验室评估工作做了科学的总结。