简易照明线路探测仪设计

设计的简易照明线路探测仪由单片机控制系统、线路探测系统组成.单片机控制系统实现按键输入扫描、液晶图文显示和语音报警提示等功能,线路探测系统能够探测和显示通电白炽灯或节能灯的电缆布设类型、位置和走向.     

由力学变分原理到定态电磁场变分原理

本文以力学变分原理为基础,引出时空算子对偶概念,据以导出定态电磁场变分原理;进而,论述了时空淡化和磁单极子问题。     

Comparison of methods for determining power generated on a rope-braked cycle ergometer during low-intensity exercise

This study compares the instrumentation and analysis techniques used when determining the power expended pedalling a rope-braked ergometer manufactured by Monark (Sweden) during a low intensity test. Power values were generated by eight subjects. The instrumentation consisted of load cells to measure the rope brake forces, a tachometer to measure the flywheel velocity and instrumented pedal cranks manufactured by Schoberer Rad Messtechnik (SRM). The subjects pedalled a rope-braked ergometer at 60 rev min^-1, against a resistance of 3 kg, for 5 minutes. Three different measurements of the mean power were recorded and these were compared with the value given by Monark. The SRM cranks provided two sets of results using different software packages supplied with the cranks. SRM standard software is used for taking measurements during training and cycle races over long time periods. An additional piece of software is provided by SRM called Ptnew, which gives readings of torque and pedal cadence over periods up to 30 seconds. Using the values supplied by Monark each subject generated 180 W of power. The mean power for the eight subjects, measured using the SRM cranks, was 170.36 W (SD 4.11) using the alternative SRM software (Ptnew) over a 30 second period and 173.68 W (SD 2.21) using the standard SRM software. From the direct measurement of the brake forces and flywheel velocity the mean power across the eight subjects was 148.90 W (SD 5.89). The SRM cranks measure the input power, whereas the direct measurement system measures the power output excluding mechanical losses. These values give a figure for the mechanical efficiency for the roped-braked ergometer of 88%. It was found that Monark overestimates the power generated by the subjects when compared with both the SRM systems and the direct measurement instrumentation.     

广东省优秀短跑、跨栏、三级跳运动员髋关节肌肉力量的等速测试研究

通过Cybex-6000等速测试系统,对广东省优秀短跑、跨栏、三级跳远项目30名(男16人、女14人)一线训练运动员髋关节进行等速向心肌力测试,对髋关节伸屈肌在60°/s、120°/s、180°/s、240°/s四种测试速度下的峰力矩、功及功率的变化进行了研究,为优秀运动员有针对性的力量训练提供科学依据.实验结果表明:随着收缩速度的增加,髋关节伸展肌相对峰力矩有下降的趋势,相对功呈逐渐减小的趋势,相对功率呈明显增大的趋势,髋关节屈伸肌峰力矩比值在0.71～0.79范围内波动,髓关节屈伸肌做功比值呈略有减少的趋势.     

高速公路计重设备防干扰技术研究

计重设备是计重收费系统的重要组成部分,其称重系统的准确性和可靠性直接关系到计重收费的公平和顺利实施。由于某些大型货车为了逃避超载的惩罚,采用大功率高频信号发射设备干扰了计重设备正常工作,现对计重设备防干扰技术进行研究,达到消除高频干扰对计重设备影响的目的。     

Automatic measurement of key ski jumping phases and temporal events with a wearable system

We propose a new method, based on inertial sensors, to automatically measure at high frequency the durations of the main phases of ski jumping (i.e. take-off release, take-off, and early flight). The kinematics of the ski jumping movement were recorded by four inertial sensors, attached to the thigh and shank of junior athletes, for 40 jumps performed during indoor conditions and 36 jumps in field conditions. An algorithm was designed to detect temporal events from the recorded signals and to estimate the duration of each phase. These durations were evaluated against a reference camera-based motion capture system and by trainers conducting video observations. The precision for the take-off release and take-off durations (indoor < 39 ms, outdoor = 27 ms) can be considered technically valid for performance assessment. The errors for early flight duration (indoor = 22 ms, outdoor = 119 ms) were comparable to the trainers' variability and should be interpreted with caution. No significant changes in the error were noted between indoor and outdoor conditions, and individual jumping technique did not influence the error of take-off release and take-off. Therefore, the proposed system can provide valuable information for performance evaluation of ski jumpers during training sessions.     

传输线模型法和ANSOFT在有损媒质场强分布的应用

介绍了二维串联节点传输线模型法（TLM法）在有损媒质环境中的应用。用该模型法导出二维电磁场的电路模型,并与ANSOFT进行了实例计算与比较分析。结果表明：TLM法可以应用于实际电路中电磁场分析与运算,且效果良好。     

《光电子学中电磁场理论》研究生课程教学的思考

研究生课程教学是研究生培养的重要环节。搞好研究生专业基础课程建设,必须准确把握课程建设的目标和定位,合理设置研究生专业基础课程教学内容,并且注重在专业基础课程教学中培养研究生的创新思维和学术能力。     

质量概念中的物理学思想方法

质量概念从“物质的量”、“惯性质量”、“引力质量”、“电磁质量”、一直到“爱因斯坦质速关系和质能关系”的形成和发展中,包含着质疑和释疑、假说和验证、唯象和机理等物理学思想方法。     

优秀运动员股四头肌、腘绳肌等速测定正常值的研究

为在运动员选材、安排训练计划、预防运动损伤与康复中使用BIODEX多关节测力及康复系统测定结果提供参考数据,测定了200名男、女运动员及20名男、女大学生的膝关节屈、伸肌群力量.其中共采用了最大力矩等8项指标,为其中6项制定了运动员"评价表格".研究中发现,过去有大腿肌肉拉伤和膝关节损伤史的运动员,并不存在长期性肌力不平衡;股四头肌最大发力角度不同于曲绵域等人过去的报导.提出了某些专项运动员在肌力方面的特点及弱点,可供教练员、运动员参考.