小型平面复合PH电极

研制了一种小型复合pH电极。电极头部为平面玻璃膜,外径3.4mm。参比室分上下两室,中间用陶瓷砂芯隔开。可用于对凝胶、纸张等表面作近似点状范围的pH测定,也可用于生物液、泥浆等污染性样品的测定。介绍了电极的使用方法。     

高精度PH测量仪表的研制

本文探讨PH测量仪表的基本原理及设计方法.该仪表以8032单片机为核心,具有PH电极自动标定与温度自动补偿功能.独特的电路设计、标定方法和温度补偿算法使仪表精度高(不低于0.01%),操作方便,可靠性好.     

酸碱溶液PH值的自动滴定控制装置

本文介绍了用MCS－51单片机对电压信号的自动控制，针对工业酸碱溶液PH值的控制设计了一套高阻抗信号检测，pH值显示和电位控制专用系统。     

联合站水体改性PH值专用控制器控制算法研究

本文分析了联合站水体改性技术中的控制要求以及扰动情况,提出了控制方案,介绍了混合器出口ＰＨ值专用控制器的控制算法以改善控制品质。     

基于PSoC3的便携式PH检测仪的设计

本文主要介绍了一款基于PSoC3的便携式PH检测仪的设计,该系统主要由主控芯片、数模转换电路、电容感应模块和液晶显示电路四个部分构成。本文主要介绍了采用PSoC3所设计的便携式PH检测仪的工作原理、系统框图及各个功能模块的软硬件设计,给出了相应的电路原理图和程序流程图。本系统具有结构紧凑、可靠便携等优点,能够很好地满足实际测量的需求。     

服从位相型分布的企业协同网络效率计算

对企业协同网络的效率进行客观量化分析和评价,是保障与推动商务链协调优化、实现网络最优协同的重要环节。在分析协同商务链多层次、多相位复杂随机现象的基础上,给出了系统服从位相型随机分布的证明,提出了复杂协同体系效率的计算方法与量化表达。该方法具有应用范围广和易于解析处理的优点。     

月见草油酸价测量不确定度的评估

本文对月见草油酸价测量不确定度进行系统研究,采用国标方法GB/T5530- 1998测定月见草油的酸价。     

Effects of exposition to polluted environments on blood cells of the fish Prochilodus lineatus

In this study, we investigated the effects of contaminated water on the blood parameters of the fish Prochilodus lineatus exposed during 7 and 20 days. Blood was collected with heparinized syringes, and blood smears were prepared and stained with Leishman stain. Slides were examined and photographed using a Leica light microscope. Total white blood cell counts and differential counts of thrombocytes and leukocytes were obtained for statistical analysis. The group exposed to water samples from Lago Azul exhibited an increase in the number of leukocytes and in the total number of white blood cells, suggesting that the chemical contaminants in this environment were acting similarly to antigens in this fish species, causing the proliferation of defense cells. In the group exposed to detergent during 20 days, the number of thrombocytes decreased. These results suggest that the variations in the number of leukocytes were indicators of environmental pollution and that biodegradable detergents may, after a certain time of exposure, affect vital functions in fish, such as coagulation and prevention of infections, which directly involves thrombocytes.     

影响油田污水pH监测的主要因素分析

本文分析了在油田污水处理过程中影响ｐＨ监测的主要因素,提出合理地在不同环境条件下传感器及其配套系统的使用方案。并通过室内和现场试验加以验证。     

冲击信号峰值检测及修正的研究

在冲击信号的检测中,峰值是描述冲击信号的一个非常重要的参数。直接测量的峰值与实际峰值之间存在着较大的误差。为降低测量误差,本文采取了尽量提高采样频率和对测量结果进行拟和的方法。以通过高采样频率测量得到的峰值为基准,讨论线性拟合．多项式拟合、指数拟合等拟合方式的适用性。并采用仿真的冲击信号对拟合结论进行检验。     

15-5PH不锈钢粗加工刀具磨损试验研究

针对15-5PH不锈钢在粗加工过程中刀具磨损剧烈问题,进行涂层可转位刀具铣削15-5PH不锈钢试验,研究了15-5PH不锈钢铣削加工过程中的刀具磨损特性。采用超景深显微镜对刀具的前刀面和后刀面磨损形貌进行了检测,结果表明:在15-5PH不锈钢加工过程中,刀具前刀面主要磨损机理是粘结磨损和扩散磨损,刀具失效形式为片状剥落和崩刃,后刀面则为边界磨损和涂层烧灼,失效形式为崩刃。     

工作酒精计修正值测量结果的不确定度评定

以工作酒精计为例,分析了工作酒精计测量过程中的不确定度来源,并对其修正值的测量结果进行了不确定度评定。     

Influence of heat treatment on hysteresis error of force transducers manufactured from 17-4PH stainless steel

Different heat treatment processes can be applied on the spring element of a force transducer in order to obtain good and satisfactory performance. The study covers the attempts of different heat treatments on spring element using 17-4PH precipitation hardened stainless steel, which is regarded as one of the best and popular spring materials for force sensor applications. Heat treatments named as H900, H925, H1025, H1150 and S450 was applied, and different hardness values were reached. Especially, S450 heat treatment process was improved in this study. It was observed that heat treatments influenced the transducer performance, particularly hysteresis behaviour point of view. The results have shown that; hysteresis characteristics were improved with increasing hardness and sub-zero treatment process.     

15-5PH不锈钢圆弧面铣削试验研究

针对15-5PH不锈钢圆弧面加工后表面粗糙度值过大问题,通过正交实验设计,开展了15-5PH不锈钢圆弧面加工试验研究。运用极差分析方法对表面粗糙度数据进行处理,确定各切削参数对圆弧面表面粗糙度的影响程度,并分析了单个因素对表面粗糙度的影响规律,得出主轴转速是影响表面粗糙度的主要因素。同时,基于BP神经网络建立了表面粗糙度的预测模型。通过对比试验值和预测值,得出该模型的相对误差较小,验证了模型构建的合理性和准确性。