排序方式: 共有12条查询结果,搜索用时 15 毫秒
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在综合环境可靠性试验中,加速度传感器的灵敏度会随不同的试验温度产生确定的、可逆的变化,而灵敏度的变化会导致振动控制系统产生系统误差.通过在不同温度下对传感器灵敏度的校准,获得了几种传感器灵敏度的温度变化特性,并提出了通过对变换器设置的传感器灵敏度进行修正,消除试验环境温度引起的系统误差的方法. 相似文献
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Jeffery L. Vowell Chriswell G. Hutchens 《Journal of the American Water Resources Association》1987,23(2):337-339
ABSTRACT: An electronic controller was developed to facilitate water sampling at discrete stage heights in perennial mountain streams of southeast Oklahoma. The controller operates in conjunction with an automatic pumping sampler and a magnetic, relay transducer. In response to changes in stage, the transducer generates an electrical pulse when relays are closed by a magnetic float. The controller monitors these relay closures and signals the sampler to pump a single sample at each desired water level during both rising and falling stages. After a sample is taken, additional switch closures at that stage axe ignored until the relay immediately above or below is closed. Inadvertent switch closures caused by turbulent stage fluctuations are not translated to the sampler thus eliminating duplicate or multiple samples at a given stage. Field testing has proven this device to be a reliable component with a range of applications for improving water quality sampling systems. The controller features battery operation, low power consumption, circuit simplicity and can be easily constructed for less than $100, including parts and labor. 相似文献
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研究开发了一种光学免疫传感器——平面波导型荧光免疫传感器系统,建立了传感基片的化学修饰和配基固定化方法,并应用该系统检测了环境小分子污染物2,4-二氯苯氧乙酸(2,4-D).结果表明,检测系统对荧光标记抗体的检测限达到0.01μg/mL.传感基片基本不对蛋白质产生非特异性吸附,而对目标污染物抗体具有很强的特异性响应,采用pH1.9、2mg/mL的胃蛋白酶溶液作为活化剂活化传感基片时,基片连续测定20个周期后性能没有明显下降,具有良好的稳定性.在间接竞争免疫检测模式下得到了检测2,4-D的标准曲线,曲线符合Logistic方程.2,4-D的检测下限为2.0μg/L,定量检测区间为5.0~3000μg/L,满足饮用水中2,4-D的检测要求. 相似文献
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Mohamad Sadegh Ghasemi Payam Hosseinzadeh Farhad Zamani Hossein Ahmadpoor 《International journal of occupational safety and ergonomics》2013,19(4):519-523
Background. Work-related musculoskeletal disorders (WMSDs) are injuries and disorders that affect the body’s movement and musculoskeletal system. Awkward postures represent one of the major ergonomic risk factors that cause WMSDs among sonographers while working with an ultrasound transducer. This study aimed to design and evaluate a new holder for the ultrasound transducer. Materials and methods. In the first phase a new holder was designed for the transducer, considering design principles. Evaluation of the new holder was then carried out by electrogoniometry and a locally perceived discomfort (LPD) scale. Results. The application of design principles to the new holder resulted in an improvement of wrist posture and comfort. Wrist angles in extension, flexion, radial deviation and ulnar deviation were lower with utilization of the new holder. The severity of discomfort based on the LPD method in the two modes of work with and without the new holder was reported with values of 1.3 and 1.8, respectively (p?<?0.05). Conclusion. Overall, this study indicated that applying ergonomics design principles was effective in minimizing wrist deviation and increasing comfort while working with the new holder. 相似文献
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煤矿井下监控系统测量的风速数据并不能用来判断故障源位置,只能反映风速传感器所在巷道的风量变化情况。引起井下风速变化的原因很多,如巷道冒落、巷道堵塞、巷道变形等,从整个通风网络角度考虑,都可以归结为分支的风阻发生变化。由于井下通风网络中任一分支风阻的变化都可能引起自身及其他相关分支风量变化。提出用逐步线性回归分析法,确定引起通风系统风速传感器报警的分支集合。建立了逐步线性回归分析的通风系统故障源诊断数学模型。通过具体实例给出了风速传感器安设在不同位置下,可能引起此分支风速超限的故障巷道集合的结果。分析了关联分支的风阻变化对角联分支的影响,从而确定选择那些对角联分支影响大且自身风量容易发生变化的巷道安设风速传感器。 相似文献
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