固体可逆接触式玻璃电极的特性与测量大白鼠胃液酸度的试验

将固体可逆接触式医用微型玻璃电极用于测定大白鼠胃液的pH值及电位差,测量值与定型生产的酸度计所测数值相比较,统计其测量偏差。试验结果表明这种电极的测量偏差比较小,而且pH值与电位差呈线性关系,在医学上具有很好的应用前景。     

在线恒温pH计的研究

在线连续测量pH值时，温度是影响pH测量准确度的主要因素之一。为减小温度对测量的影响，利用半导体制冷片的双向功能及体积小的特点，将pH电极置于小型恒温系统内进行连续测量，从而有效地提高了仪器的测量准确度。     

用双积分A/D实现PH测量的自动温度补偿

pH值的电化学测量方法一般是采用玻璃电极和参比电极插入被测溶液,构成一个测量原电池来进行的。这个电池的电动势与pH值的关系可表示为 E=E_0-K·pH·(273+t)/298 式中E_0是不随pH值和溶液温度变化的常数,K≈58.1mV·pH~(-1)是因玻璃电极而异的常数,t是温度(℃)。     

氨气敏电极法测定食醋中总氮含量

采用ＰＨＳ－２Ｄ型离子酸度计，５０１型氨气敏电极，在ｐＨ〉１２的条件下直接测定电极电对的平衡电位差值，再对测定数据线性回归，利用线性回归方程测定食醋中总氮含量，结果表明此法快速，简便，并且其准确度和精密度都是十分理想的。     

玻璃电极吸附对pH值测定影响的研究(Ⅰ)——高分子、胶体溶液中pH值的测定

本文在国内首次报道了在高分子和胶体溶液中用玻璃电极测定 pH 值时具有吸附作用,并在相同溶液中与锑电极作了对比试验。文中对玻璃电极的吸附机理做了理论上的分析,两电极的差异(△pH)是由于玻璃电极吸附所致,并将两电极用于皮革生产中,绘制了两电极的△pH 关系图。     

电凝聚法处理印染废水过程中铁电极行为的研究

本文对以铁为电极进行电凝聚处理印染废水时pH值对铁电极行为的影响进行了研究。测出在恒电流条件下电解电压,阴极电位和阳极电位随PH值的变化曲线以及不同pH值条件下恒电位极化曲线。据此研究了电解时电极反应和应控制的pH条件。     

数字电位差计的设计与研制

介绍一种采用先进的电子技术设计出新型高精度的电位差计，该仪器电子线路用高千钧一发生的可调电源取代传统电位地的干电池和标准电池，用记灵敏度的电子栓流计取代机械检流计，配上单片机，通过对可调电源的测量，即可精确的测量出特测电动势值。     

直流电位差计中几种误差因素的产生及消除方法

电位差计是一种精确度很高的测量仪器，但用它进行测量的过程中，仍然会产生误差。本文利用电位差计的工作原理，介绍了几种误差因素的产生及消除的方法。     

测定电位差圈定火山岩富铀层位

岩石的电位差（△Eh）控制着变价元素的地球化学行为，用差减电位法对330铀矿区393个火山岩的△Eh值测量结果表明：火山岩的△Eh值可以准确地圈出铀的富集层位，铀矿化只产在△Eh值高的岩石中。     

十一线直流电位差计的研制

介绍一种十一线直流电位差计的设计与制作,这种电位差计克服了板式电位差计的不足,且有结构简单、体积小、外型美观、测量精确度高等特点。     

Electrochemical performance of nano-scale β-Ni(OH)2 prepared at different transformations of pH value

The influence of transforming pH values on the electrochemical performance of nano-scale Ni(OH)2was analyzed. The measurement results of XRD indicate that the nano-scale Ni (OH)2 prepared at different transformations of pH value is β( Ⅱ )-phase with different crystal lattice parameters. Cyclic voltammograms (CV) and electrochemical impedance spectroscopy(EIS) measurement results show that transformations of pH value affect the proton diffusion coefficient (D) and charge-transfer resistance (Rct) of the material. The simu-lation of cell experiment shows that the sample prepared at a pH of 10. 1 exhibits the maximum specific capacity(327. 8 mAh/g) and higher discharge platform, the discharge performance of electrodes depends on both D and Rct, so the kinetics characteristics that electrodes reaction is controlled by both mass-transfer step and charge-transfer step are put forward.     

复杂地质条件下的频率电磁测深

分析了大地中不同位置的介质电性对赤道偶极装置频率电磁测深结果的影响，指出在复杂地质条件下作剖面性频率电磁测深，宜采用固定供电电极位置，只移动测量电极的平行电极装置，将测量电极中点定为纪录点；采用较大的供电极距以获得较强的测量信号和较小的测量极距以获得较高的横向分辨率，推导了有限长供电极距的平行电极装置的装置系数公式。     

电渗模型电阻测量技术

本文对电渗模型中电阻测量方法进行了改良,提出串联法代替当前的电势测针法和夹具法,并提出了适用于测量EKG电极电阻的走线法。串联不同长度的电渗土体测量电极与土体间的接触电阻消除了电势测针法中测针与电极之间一段土体电阻值的误差影响,同时避免了电势测针插入土壤对土壤电流分布的影响;串联不同长度的电渗电极测量电极电阻率时消除了夹具法测量时夹具和电极之间接触电阻的误差影响。经试验结果表明：电势测针法所得的接触电阻与串联法得到的接触电阻比值大多在1.3~1.4之间,验证了电势测针法将测针与电极间的一段土体值计入了接触电阻造成所测得的接触电阻偏大,该值的大小取决于该段土体电阻值;串联法对于当前应用广泛的EKG电极并不适用,提出了走线法来测量EKG电极电阻率消除电极板内因嵌入铜制导线电流分布不均的影响,走线法测量结果基本不受电极长度的影响,具有良好的可靠性和稳定性,走线法测量便捷,方便应用于EKG电极生产工艺中,有比较广阔的应用前景;走线法测量EKG电极所得的电阻率与夹具法得到电阻率的比值大多在8%~10%之间,该比值主要与夹具电极板间的接触电阻相关,夹具和电极板之间的接触电阻仅取决于夹具和电极板,故可利用该比值对先前使用夹具法的测量结果进行修正,在许多室内试验和工程中均用到了EKG电极,考虑EKG电极电阻率对整个试验和工程的能耗影响时可参考电阻率比值0.08~0.1进行修正。     

A Comparative Study of the Electrodes Gels’ Electrical Properties in the Measurement Issues of Intrabody Communication

Intrabody communication (IBC) technology is becoming progressively more standardized due to its low power consumption and high security features incorporated into the third physical layer of the IEEE 802.15.6 standard. Even then, there are still many challenges in normalizing the measurement issues of IBC. A major concern that should not be overlooked is the electrodes in the IBC, especially the popular use of gel electrodes. In the channel measurements, gel electrodes are commonly employed to improve the signal-to-noise ratio and prevent electrodes from falling off. In this paper, a comparative study of the electrical properties of gel was investigated during the measurement of human channel characteristics and to clarify the differences of them. Firstly, the basis of electrostatic field pole plate measurements and electromagnetic theory were introduced to interpretate how the relative permittivity and conductivity of different gels will influence the measurement results. Then the in vivo experiments with different gel or dry electrodes were performed to compare the differences induced by the gel. The results indicate that the influence of the gel on the human channel measurement is mainly concentrated below 400 kHz (the attenuation is reduced by 16.7 dB on average), and the stability of the permittivity and conductivity of the gel has a direct impact on the stability of its measurement of the human channel. This result may provide a meaningful reference for the standardization of electrode usage in IBC.     

葡萄糖在纳米多孔Ir/IrO_x电极上的电催化氧化

主要研究纳米多孔Ir/IrOx电极的制备及电极对葡萄糖的检测.在150μm的铱电极上采用高电位氧化和低电位还原的方法成功的制备了纳米多孔Ir/IrOx电极,并对其进行表征.同时,研究了纳米多孔Ir/IrOx电极对葡萄糖的直接氧化,由此得出的结果是在pH为7.6的PBS溶液中,电位0.7 V的条件下电极对葡萄糖有较快较灵敏的响应,响应电流与葡萄糖浓度在2～22 mmol/L的范围内成正比,检测限为28.1μmol/L.     

Flotation performances of polymorphic pyrrhotite

The floatability of different crystalline structures of pyrrhotite (monoclinic and hexagonal) was studied. It is shown that the floatability of monoclinic and hexagonal has obvious difference, and that the flotation recovery of monoclinic pyrrhotite is larger than that of hexagonal pyrrhotite using different collectors. When butyl dithiophosphate is used as the collector, the recovery is larger than that by sodium butyl xanthate and sodium diethyl dithiocarbamate. At the pH values ranging from 6 to 9, monoclinic pyrrhotite can be floated well, and the flotation recovery is higher than 90%. Monoclinic and hexagonal pyrrhotites are more easily activated by Cu²⁺ in acidic conditions than in alkaline conditions. But Cu²⁺ cannot activate hexagonal pyrrhotite using sodium diethyldithiocarbamate as the collector. By the measurement of contact angle, it is indicated that monoclinic and hexagonal pyrrhotites float well and are easily activated by Cu²⁺ when dithiophosphate is used as the collector. Using sodium diethyl dithiocarbamate as a collector, the relationship between potential and pH range for pyrrhotite flotation is established. At pH 5, the optimal potential range for flotation of monoclinic pyrrhotite is about 125–580 mV (vs SHE), with the maximum flotation occurring at about 350 mV (vs SHE); the optimal potential range for flotation of hexagonal pyrrhotite is 200–580 mV (vs SHE), with the maximum flotation occurring at about 300 mV (vs SHE).     

一种新的石油储层高分辨自然电位测井电极系

针对目前使用的自然电位测井电极系仍采用原始的地面参考电极,存在测量干扰大、测井曲线分辨率低等长期未能解决的问题,设计一种井下参考电极的高分辨自然电位测井电极系,电极系采用阵列式结构,电极之间彼此绝缘,仪器在上提过程中,通过单片机自动识别经过泥岩地层的参考电极,然后以泥岩电位为参考电位进行自然电位测量.现场试验结果令人满意,其抗干扰能力和曲线分辨率均较原有的自然电位测井电极系明显提高.