模拟化学实验软件——Medel Chemlab

本文简单介绍了模拟化学实验软件Medel Chemlab的内容,功能和特点。     

A crucial experiment resubmitted.

Presents the "experiment" conducted by the prophet Elijah in 1 Kings 18:17–40 in which the priests of Baal and Elijah each sacrificed a bull and invoked the name of their respective god, but only Elijah's god responded. Satirical comments of 3 "reviewers" of psychological articles are included to show the ethical and methodological issues that might be raised if such an experiment were conducted today. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于模块化的大综合PLC实验平台的研究与设计

提出了一种基于模块化设计的柔性大综合PLC实验平台。该实验平台以PLC为核心,融合了单片机技术、无线测控技术、多种上位监控技术、基于以太网和电话网的远程控制技术、变频以及步进电机驱动等技术,可灵活组合不同功能模块完成基础性、综合性、开放性和设计性的几十种实验,为PLC大综合实验平台的设计进行了有益的探索。     

An optimal sampling approach to modelling whole-body vibration exposure in all-terrain vehicle driving

Abstract

Exposure to whole-body vibration (WBV) presents an occupational health risk and several safety standards obligate to measure WBV. The high cost of direct measurements in large epidemiological studies raises the question of the optimal sampling for estimating WBV exposures given by a large variation in exposure levels in real worksites. This paper presents a new approach to addressing this problem. A daily exposure to WBV was recorded for 9–24 days among 48 all-terrain vehicle drivers. Four data-sets based on root mean squared recordings were obtained from the measurement. The data were modelled using semi-variogram with spectrum analysis and the optimal sampling scheme was derived. The optimum sampling period was 140 min apart. The result was verified and validated in terms of its accuracy and statistical power. Recordings of two to three hours are probably needed to get a sufficiently unbiased daily WBV exposure estimate in real worksites. The developed model is general enough that is applicable to other cumulative exposures or biosignals.

Practitioner Summary: Exposure to whole-body vibration (WBV) presents an occupational health risk and safety standards obligate to measure WBV. However, direct measurements can be expensive. This paper presents a new approach to addressing this problem. The developed model is general enough that is applicable to other cumulative exposures or biosignals.     

化学实验教学中教师的指导作用

文章介绍教师在化学实验教学过程中的指导作用,并给出实例。     

基于长时性特征的音位属性检测方法

提出一种基于长时性信息的音位属性检测方法,该方法通过高、低两层时间延迟神经网络(TDNN)进行实现,低层TDNN在短时特征上进行音位属性的检测,高层TDNN在低层检测结果的基础上,对更长时段上的信息进行融合。实验结果表明,引入长时性特征使得音位属性检测率提升约3%,将音位属性后验概率作为音素识别系统的观测特征,使用长时性特征的识别结果提升约1.7%。     

宽带最大似然方位估计快速算法水池实验研究

建立了宽带阵列高分辨方位估计水池实验系统,进行了宽带最大似然方位估计快速算法的水池实验研究。研究结果表明,基于马尔可夫链蒙特卡罗方法宽带最大似然方位估计快速算法分辨能力强,突破了二分之一波束宽度,估计出了目标的方位。     

氮磷钾高浓度烤烟专用肥

介绍硝酸铵－磷酸－铵－硫酸钾系高浓度烤烟专用复合肥的开发应用，三年的试验推广的实践证明，其肥效可与进口肥相媲美，配方合理，但价格比进口肥每吨低４００元左右。     

Parametric synthesis of pulsar time

A new method of generating pulsar time based on a coherent representation of a sequence of observed events is considered. The properties of pulsar time compared with the traditional approach are analyzed. __________ Translated from Izmeritel’naya Tekhnika, No. 6, pp. 39–44, June, 2006.     

工程训练教学模式与运行机制的改革探讨

文章对广东工业大学工程训练中心教学的现状和不足进行了分析，对其教学模式与运行机制的改革提出几点设想，以适应新形势发展的需要。