Study on Properties of LSGM Electrolyte Made by Tape Casting Method and Applications in SOFC

Solid oxide fuel cell is attracting more attention in recent years for its lower pollution emission and high energy convert efficiency. La0.9Sr0.1Ga0.8Mg0.2O3-δ is a new kind of electrolyte for intermediate temperature SOFC. In this paper, La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM) was prepared by solid state reaction method and formed by tape casting process to make a planar electrolyte. The appropriate amount of the dispersive was obtained by viscosity test. The densities of sintered samples increase with the increasing sintering temperature. It was found that the relative density of electrolyte can approach the value of 95% by the isostatic pressing treatment of the green tape. The average thermal expansion coefficient of the LSGM is 11.4×10-6/℃ at temperature range (200～1200 ℃). Measurements of the current-voltage and power-current characteristics of the H2-Air cell show that the open-circuit voltage is 1.067 V at 800 ℃, peak current density is 0.56 A·cm-2 and the maximum power output is 0.147 W·cm-2.     

Mechanical and AC loss properties in mono-and multi-filamentary Bi-223 Ag-sheathed tapes

The evaluation of the bending strain tolerance and AC loss properties for monoand multi-filamentary Bi-2223 Ag-sheathed tape were carried out at liquid nitrogen temperature. For tapes with a filament number of over 19, the critical current (I_c) was maintained at the same values up to the bending strain of 0.3%, although the I_c of the mono-filamentary tape at the condition of 0.2% strain degraded to 90% of the value for the no-strain condition. The AC loss of the monofilamentary tape was the hysteresis type. On the contrary, the AC loss of the multi-filamentary tape was substantially dominated by the eddy current loss in the Ag matrix.     

高温超导带材剩余磁场非接触无损连续测量方法及装置

通过对高温超导带材内部剩余磁场的连续测量，计算机采集数据，并依据超导临界态理论模型计算出临界电流值。为Bi系高温超导带材提供了一种非破坏的连续检测手段，不仅实现了超导带材剩余磁场的实时显示，而且可以给出超导带材均匀性的信息，最终能够计算出整根超导带材临界电流的平均值和不确定度。     

一台220 kV电力变压器铁轭拉带故障分析

文章对一台大型电力变压器由于上轭铁心拉带放电引起的油色谱异常现象,经过对色谱数据和运行情况的综合分析,对变压器故障点作出准确判断,现场对该变压器进行了解体检查、处理,对避免此类故障的发生提出了改进建议.     

TDA5005全站仪用于11m天线测量

对高精度全站仪用于大中型天线安装测量进行了有益的尝试。坐标测量采用TDA5005全站仪配合测距反射片，导出了测距入射角计算公式，提出了一种反射片加常数测定方法。在数据处理方面，讨论了标志厚度对面型的影响。计算发现，对于圆抛物面天线而言，曲面自由拟合法与CAD面型拟合法是相当的。天线机械调整效果得到了电测结果的验证。     

多通道电话录音系统的设计与实现

为了监控电话通话,传统的方法是使用普通的模拟磁带式录音机,但这种方式不便于对电话录音进行查询和重放,也不利于电话录音数据的保存和管理.针对民航调度指挥中心监听和记录电话通话的需求,给出了一个基于计算机电信集成技术的电话录音系统的系统组成结构和实现方法.该系统可以同时记录多门电话的通话情况,并可以监听这些电话的实时通话.另外,所有电话的通话信息被自动备份到数据磁带上,可以在需要的时候进行恢复和重放.     

一台220kV电力变压器铁轭拉带故障分析

文章对一台大型电力变压器由于上轭铁心拉带放电引起的油色谱异常现象,经过对色谱数据和运行情况的综合分析,对变压器故障点作出准确判断,现场对该变压器进行了解体检查、处理,对避免此类故障的发生提出了改进建议。     

The Shear Stress–Strain Behaviour of Low-modulus Structural Adhesives

The shear stress–strain behaviour of two low-modulus structural adhesives has been measured using the butt-torsion test. The Nadai correction for non-linear shear behaviour is explained as it is necessary to understand how this correction can be applied to butt joints. The results for one adhesive were accurately used to predict the strength of a lap joint, and it was shown that the strength of such a joint can approach that of a conventional, modern, structural epoxy. Structural adhesives are usually reckoned to be those with a high strength (50 MPa and upwards) and (these days), a strain to failure of at least 10% in tension, and which usually have a tensile modulus of 2 GPa or so. However, adhesives which are significantly less stiff, less strong, but much more ductile are entering the ‘structural’ arena. In order to evaluate their effectiveness and use in design, it is necessary to be able to measure accurately their stress–strain behaviour. Two such materials are 3M 9245 Structural Bonding Tape (SBT) and 3M 7838 B/A.     

Evaluation of pressure-sensitive tape adhesion and backing directionality by excimer laser methods

The effects of 248 nm KrF excimer laser irradiation on a pressure-sensitive adhesive tape bonded to a glass substrate were investigated as a possible method to evaluate the quality of adhesion, as well as the directionality induced during manufacture. The model pressure-sensitive tape consisted of biaxially-oriented polypropylene (PP) tape coated with a hot-melt rubber resin. Analysis of the front-shot experiments, which were performed by irradiation through the PP backing, allowed correlation between the excimer laser irradiation-induced detachment and the peel adhesion strength. For this purpose, peel tests were performed before and after laser shots. The directionality induced during manufacture resulted in a more ablated area in the strength direction than in the transverse direction when the bonded tapes were irradiated with an elliptically-shaped laser beam above the ablation threshold. A correlation was found between the detachment bubbles created by irradiation below the ablation threshold and their respective peel adhesion values, which allows us to evaluate the quality of adhesion for pressure-sensitive tapes. Thus, a method to evaluate the quality of adhesion using an excimer laser is proposed based on the findings of this work.