砂土潮湿状态下悬臂式挡土墙RBT模型试验

鉴于悬臂式挡土墙在实际运营过程中受外界因素影响多呈现为挡土墙平移和绕墙底转动的组合位移（RBT）变形模式,且墙背填料经常处于潮湿状态,经典土压力理论不能合理反映其实际受力状态。为了揭示土体潮湿状态及RBT模式下悬臂式挡土墙墙后土压力分布规律,设计制作了基于RBT模式的悬臂式挡土墙模型试验装置,并开展了不同RBT转动位移量下的模型试验,得到了RBT模式下悬臂式挡土墙墙后土压力分布规律,并与现有理论对比,验证了试验结果的可靠性。依据测试结果,进行了理论公式验证。结果表明:对悬臂式挡土墙施加向外转动位移时,由于潮湿砂土存在较为明显的假性黏聚力,墙背土压力随墙体转动位移的增大而呈现较为明显的先减小后增大的趋势;随着转角增大,水平土压力减小,且下部土体减小趋势较缓,墙体中部位置水平土压力计算值大于实测值。     

一种语音导览系统的设计与实现

给出了一种可用于复杂自然环境下的景点语音自动导览系统。采用STM32F103RBT6作为MCU通过SPI模块与语音芯片ISD4004进行通信,来实现景点语音信息的随机录放;利用无源RFID实现景点的自动触发和识别。重点介绍了系统的主要功能设计和实现过程。     

AM3359的钢轨实时检测与数据融合无线传输

针对钢轨轮廓检测时,数据量大且后期分析计算算法较为复杂这一特点,设计了一套钢轨轮廓检测与数据无线传输系统.该系统主要由激光二维传感器、以太网收发器、AM3359核心微处理器、U BLOX定位模块与4 G通信模块组成.利用激光二维传感器采集钢轨轮廓数据,同时U BLOX接收GPS卫星给出的地理坐标信息.AM3359对钢轨轮廓数据与地理信息数据进行数据融合,并最终利用4G模块通过Internet上传至云端服务器进行后续数据处理.该系统具有功耗低、检测精度高、数据传输距离不受制约等特点.     

Mitigating the ICA Attack against Rotation‐Based Transformation for Privacy Preserving Clustering

The rotation‐based transformation (RBT) for privacy preserving data mining is vulnerable to the independent component analysis (ICA) attack. This paper introduces a modified multiple‐rotation‐based transformation technique for special mining applications, mitigating the ICA attack while maintaining the advantages of the RBT.     

一种基于检测伽马射线的料位计设计

为了实现煤仓内煤料高度的测量,设计了一种基于STM32F103 RBT6的料位计测量控制系统,该系统能够利用煤料中的放射性物质,通过光电效应将放射性信号转化为电流信号,并且通过对电流信号进行采样、转化.最终计算出煤仓内料位的高度.具有功耗低、寿命长、精度高等优点.     

基于STM32的双轴监控云台精准控制系统设计

智能监控系统的快速发展对云台控制精度要求不断提高,由此设计并实现了一款双轴监控云台精准控制系统。本系统利用 USART 串口接收标准数控程序指令 G 代码,通过移植 CNC 雕刻机运动控制器 GRBL 到云台控制器STM32 F103 RBT6中控制两台步进电机协同工作,实现云台精准控制。将数控机床中精准的直线插补和弧形、圆形运动功能运用到监控云台中,提高控制精度,实现云台快速响应和平稳加速以及无冲击的转弯。本系统在智能家居、区域安防等智能监控领域有很好的实用价值,适合现代视频监控领域的发展要求。     

微小型球形飞行器飞行控制系统设计

根据微小型球形飞行器的结构特点和工作原理,设计了一套基于ARM Cortex-M3 STM32F103RBT6微控制器的飞行控制系统,进行了主要模块的功能设计与性能分析,给出了研究结论与选型依据,还设计并完成了姿态传感器两轴转台实验和飞行器室内飞行试验;测试结果表明,该控制系统的姿态传感器姿态测量精度高,能够为飞行控制提供姿态参考信息;飞行器能够圆满实现空中悬停、低空机动等飞行动作,且空中飞行姿态稳定、实时、可靠;该飞行控制系统功能可靠、性能稳定,能够较好地满足微小型球形飞行器的飞行控制要求,具有一定的实用性与扩展性。     

一种雨伞干燥及鞋底清洁两用装置

本文提出了一种雨伞干燥及鞋底清洁两用装置的创新实践方案,采用双STM32F103RBT6 单片机作为智能控制中心,通过引入串口通信和外部中断检测技术把电动机主控器和信息处理与显示控制系统联系起来,组成完整的多功能清洁干燥装置。该一体化系统使用编程思路与硬件设计相结合的方法控制装置实现鞋底清洁、雨伞干燥、人机界面交互的功能,具有电路简单灵活、元件识别度高的特点。用户可通过电阻触摸屏直接查看设备的实时状态。经过测试,结果表明其具备较高的稳定性和可行性。     

基于STM32人流量统计监控系统设计

设计了一种基于STM32F103RBT6为核心处理器的对某区域内人流量进行实时测量的统计系统。系统分为A和B两部分,分别装在入口和出口处,利用热释电红外传感器作为人流量传感器,当有人进入时,系统A部分传感器感应到人员并同时把数据传输给STM32主控制器,主控制器把数据通过OLED显示出来,当有人离开时,系统B上的热释电红外传感器感应到人员离开时通过无线收发模块NRF24L01+及时发送数据给系统A,A接受来自B的信息及时处理并更新显示器。该系统适合在游览景区、展览馆进行限流,分流管理等情况下使用。     

Profile of women detected drink driving via Roadside Breath Testing (RBT) in Queensland,Australia, between 2000 and 2011

Background

Drink driving among women is a growing problem in many motorised countries. While research has shown that male and female drink drivers differ on a number of characteristics, few studies have addressed the circumstances surrounding women's drink driving offences specifically.

Aim

To add to previous research by comparing apprehension characteristics among men and women and to extend the understanding of the female drink driving problem by investigating the drink driving characteristics that are unique to women.

Results

The sample consisted of the 248,173 (21.5% women) drink drivers apprehended between 2000 and 2011 in Queensland, Australia. Gender comparisons showed that women were older, had lower levels of reoffending, and were more likely to be apprehended in Major Cities compared to men. Comparisons of age group and reoffending and non-reoffending among female drink drivers only revealed that higher BAC readings were more common among younger women. Moreover, a substantial minority (13.7%) of women aged 24 years or younger were apprehended with a BAC below0.05%, reflecting a breach of the zero tolerance BAC for provisional licence holders in Australia. Older women were more likely to be charged with a ‘failure to provide a test’ offence as a result of refusing to provide a breath or blood sample, indicating that drink driving is associated high levels of stigma for this group. Reoffending occurred among 16.2% of the female drink drivers and these drivers were more likely than non-reoffending drivers to record a mid to high range BAC, to be aged 30–39 or below 21years, and to be apprehended in Inner Regional or Remote locations.

Conclusion

Findings highlight the unique circumstances and divergent needs of female drink drivers compared to male drivers and for different groups of female drivers.