自动喷水灭火局部应用系统在高层住宅楼的应用

高层住宅楼的火灾危险性极大,高层建筑物内设置的室内消火栓系统的弊病主要是不及时维护造成消火栓无法正常使用且人为操作困难.为提高建筑自防自救能力,可在高层住宅楼内设置自动喷水局部应用系统.自动喷水灭火局部应用系统设计中应注意的问题:自动喷水局部应用系统在高层住宅楼内的设置部位、系统选型、供水方式及设计要适当合理.     

九鼎制多始末略考

鼎是青铜礼器中最为典型的器物,用鼎制度就成为礼之核心,因为鼎不仅是当时社会礼仪之用器,还是沟通人神之工具,更为重要的是成为等级与权力之标志。九鼎在周代历史上为国朝之重器,产生于西周的列鼎制度,是集祀权、神权、政权于一体的象征物,对后世产生了很大影响。     

基于单片机控制的自动浇灌器设计

该文以单片机为控制核心,设计一种能够根据环境光照强度、湿度、温度等参数的变化而自动调节控制,并具有显示功能的智能浇灌器。整个浇灌器由单片机、光强传感器、湿度传感器、温度传感器、前置电路、A/D转换器、电机和水泵、电源、键盘、液晶显示等主要部分组成。单片机采集光强、湿度和温度信号,通过软件与事先设定的控制参数比较,并根据比较结果选择合适的灌溉方案程序,控制电机和水泵的启动,实现智能化灌溉。该系统可以广泛应用于户外植物及家庭花草栽培的自动浇灌。     

营运客车追尾碰撞速度分析

建立某6127型营运客车和某重型货车的追尾碰撞模型,将碰撞速度分别设置为30 Km/h、40 Km/h和50 Km/h,在LS-DYNA软件中分别进行了有限元仿真,通过后排座椅的位移量、客车质心的加速度和假人颈部损伤值三项指标的对比分析,结果表明在40 Km/h的碰撞速度下,车身结构的变形与实际的碰撞事故较为接近,其它两项评价指标也较为合理。     

对贵州高校图书馆自动化管理系统建设的思考

为了促进贵州省高校图书馆的协调发展,对贵州省高校图书馆和江苏省高校图书馆的自动化管理系统使用情况进行了调研。结果显示,贵州省高校图书馆自动化进程比江苏高校图书馆相对滞后,且目前使用的自动化管理系统与贵州高校图书馆的业务工作和读者服务工作不相适应,已成为目前制约贵州高校图书馆发展的主要因素,是贵州高校图书馆亟需解决的问题。     

基于工作过程系统化的课程开发与实施——以“自动生产线安装与调试”为例

"自动生产线安装与调试"是机电一体化技术专业进行岗位能力培养的一门核心课程,涉及自动化生产线的安装、编程、调试、故障诊断及排除等方面的技术。针对课程的培养目标,基于工作过程系统化的专业课程改革,应从专业培养目标定位、岗位能力分析、学习领域设计、学习情境设计等方面进行。     

自动标引研究进展

近五年来自动标引研究在关键词抽取、标引系统设计、自动分类标引、网络信息自动标引、数字图像标引、音频信息标引、视频信息标引、自动标引结果评价等方面取得很大进展,但尚存弱点与不足之处,还不能达到人工标引的效果。今后的研究将朝着探索更优越的语言分析技术、更高端的多媒体信息自动标引方法、高效的知识库智能自学习机制、多种标引方法或模型的互补的集成学习等方向发展。     

一种宽带高线性高增益功率放大器的研究与设计

倍频程宽带功率放大器是宽带射频前端的关键部件,在无线电通信、雷达、电子对抗设备中有着广泛的用途.在对晶体管进行分析的基础上,选择InGaP／GaAs异质结双极晶体管TQP7M9105,该晶体管是高线性、高增益的输出功率1W的驱动级功率放大器.设计带宽为400MHz-800MHz,在电路设计中采用新的负载牵引、源牵引仿真方法,在输入激励为12dBm条件下,设计带宽内增益达到19dB,带内波动±1dB,实验结果和仿真结果非常吻合.     

Acceleration and sprint profiles of a professional elite football team in match play

Abstract

The aim of this study was to characterise the acceleration and sprint profiles of elite football match play in one Norwegian elite football team (Rosenborg FC). Fifteen professional players in five playing positions took part in the study (n = 101 observations). Player movement was recorded during every domestic home game of one full season (n = 15) by an automatic tracking system based on microwave technology. Each player performed 91 ± 21 accelerations per match, with a lower number in the second compared with the first half (47 ± 12 vs. 44 ± 12). Players in lateral positions accelerated more often compared to players in central positions (98.3 ± 20.5 vs. 85.3 ± 19.5, p < 0.05). Average sprint distance was 213 ± 111 m distributed between 16.6 ± 7.9 sprints, with no differences between first (106 ± 60 m, 8.2 ± 4.2 sprints) and second halves (107 ± 72 m, 8.3 ± 4.8 sprints). Players in lateral positions sprinted longer distances (287 ± 211 m vs. 160 ± 76 m, p < 0.05) and tended to sprint more often (21.6 ± 7.8 vs. 13.0 ± 5.7, p = 0.064) compared to players in central positions. We found more walking and less of the more intense activities during the last third of the season compared to the first. The main finding in this study was that Norwegian elite players had substantially less number of accelerations and fewer but longer sprints than previous studies reported for higher-ranked leagues. Also, less high-intensity activity was found towards the end of the season. Ultimately, these data provide useful information for the fitness coach (1) in planning of position-specific football training and (2) to avoid the decline in high-intensity activities the last third of the competitive season.     

The influence of implicit cognitive processes on physical activity: how the theory of planned behaviour and self-determination theory can provide a platform for our understanding

The influence of implicit cognitive processes on social behaviour has been heavily scrutinised in recent years. A burgeoning body of literature now indicates that implicit processes are particularly predictive of those behaviours that are spontaneously performed and difficult to control. Although interest in implicit cognition has been strong in many fields, few studies have investigated the role of implicit cognitive processes on physical activity. In this article we highlight the avenues through which implicit processes might influence different forms of activity. Two of the most prominent theories in sport and exercise psychology – the theory of planned behaviour and self-determination theory – are used as templates through which discussion is focused. Studies on implicit processes that have utilised these theories are reviewed and critiqued, and the implications of findings from these studies on the prediction of physical activity are discussed. The final section includes a discussion of recent theorising on the mechanisms through which implicit cognitive processes might change. It is hoped that discussion of these important issues will stimulate research into the role of implicit cognitive processes in physical activity.