聚天冬氨酸在KNO3介质中的缓蚀性研究

采用极化曲线法研究了聚天冬氨酸缓蚀剂在KNO，的量浓度为0．1mol/L的溶液中对碳钢的缓蚀作用。试验结果表明：聚天冬氨酸对碳钢的阴极和阳极极化都有抑制作用，但以抑制阳极为主，是一种混合型缓蚀剂。试验中随着聚天冬氨酸质量浓度的增大，缓蚀效率提高，最佳质量浓度是400mg／L。根据试验结果，初步认为聚天冬氨酸属于吸附膜缓蚀剂。     

Defect‐Mediated Polarization Switching in Ferroelectrics and Related Materials: From Mesoscopic Mechanisms to Atomistic Control

The plethora of lattice and electronic behaviors in ferroelectric and multiferroic materials and heterostructures opens vistas into novel physical phenomena including magnetoelectric coupling and ferroelectric tunneling. The development of new classes of electronic, energy‐storage, and information‐technology devices depends critically on understanding and controlling field‐induced polarization switching. Polarization reversal is controlled by defects that determine activation energy, critical switching bias, and the selection between thermodynamically equivalent polarization states in multiaxial ferroelectrics. Understanding and controlling defect functionality in ferroelectric materials is as critical to the future of oxide electronics and solid‐state electrochemistry as defects in semiconductors are for semiconductor electronics. Here, recent advances in understanding the defect‐mediated switching mechanisms, enabled by recent advances in electron and scanning probe microscopy, are discussed. The synergy between local probes and structural methods offers a pathway to decipher deterministic polarization switching mechanisms on the level of a single atomically defined defect.     

10kV纡路接地故障检出仪的研制

研制出了一种能快速地检出10kV电力线路接地点的实用仪器，该仪器利用10kV电力线路接地点向周围发射5次谐波分量比例最大的特性，采用双T滤波网络，检测5次谐波波源，找到线路接地点。     

Polarization effects in nitride semiconductors and device structures

Wide bandgap nitride semiconductors have recently attracted a great level of attention owing to their direct bandgaps in the visible to ultraviolet regions of the spectrum as emitters and detectors. Moreover, this material system with its favorable hetero-junctions and transport properties began to produce very respectable power levels in microwave amplifiers. If and when the breakdown fields achieved experimentally approach the predicted values, this material system would also be very attractive for power switching devices. In addition to the premature breakdown, high concentration of defects, and inhomogeneities, a number of scientific challenges remain including a clear experimental investigation of polarization effects. In this paper, following a succinct review of the progress that has been made, spontaneous and piezoelectric polarization effects and their impact on sample device-like hetero-structures will be treated. Received: 5 April 1999 / Reviewed and accepted: 19 April 1999     

CATHODE ELECTRODEPOSITION OF LEAD IN Pb~(2 )-OH~--C_4H_4O_6~(2-) SYSTEM

ＣＡＴＨＯＤＥＥＬＥＣＴＲＯＤＥＰＯＳＩＴＩＯＮＯＦＬＥＡＤＩＮＰｂ２＋ＯＨ－Ｃ４Ｈ４Ｏ２－６ＳＹＳＴＥＭ①ＣｈｅｎＷｅｉｐｉｎｇ，ＣｈｅｎＦａｎｃａｉ，ＰｅｎｇＹａｎｂｉｎｇ，ＬｉＱｉｚｈｏｎｇ②，ＢｉａｎＫｅｊｕｎ，ＺｈｅｎｇＹｕｅＩｎｓｔｉ...     

环形探测器的研制及其在扫描电子束设备中的应用

本文简要介绍了灵敏面直径分别为20,12mm,中心孔为4mm的环形探测器的制造工艺和基本性能。并给出了扫描电子显微镜和扫描电子束爆光机中,采用环形探测器检测背散射电子的实验数据、曲线及扫描图象。     

The electrochemical dissolution of cobalt in carbonate-bicarbonate solutions from EIS and steady polarization data

The cobalt electrodissolution process in carbonate-bicarbonate containing solutions 8.9 ? pH ? 10.5 covering relatively wide ranges of ionic strength, pH, and hydrodynamic conditions, has been investigated using electrochemical impedance spectroscopy (EIS) and steady polarization data. To distinguish the competing stages of the metal electrodissolution mechanism a cobalt rotating disc electrode was utilized. The proposed mechanism model consists of the formation of adsorbed Co(I) intermediate species followed by mass-transport contributions of soluble Co(II) ions as final products. The coherence of the proposed mechanisms with EIS and steady polarization data is presented.     

Electrochemical study of AISI 304 stainless steel during the exposure at the disinfectant solutions with fungal suspensions

The effect of fungal suspensions on the disinfectant solution (Actisept with sodium dichloroisocyanurate as active substance, which releases 140 ppm active chlorine) and the corrosion behavior of type AISI 304 stainless steel (SS) were evaluated through linear polarization. The work presents a study of biocide Actisept solution as reference solution and the mixed solutions: reference biocide Actisept solution with three fungal suspensions (10 vol%), Aspergillus niger, Candida mycoderma, and Saccharomyces cerevisiae. The fungal suspension has an important influence on the synergistic effect of the SS corrosion in the following order: Saccharomyces cerevisiae > Candida mycoderma > Aspergillus niger. The E_corr values from the mixed solutions decreased with immersion time of the samples. In the case of Aspergillus niger, the corrosion rate was lower than that of any other type of fungal suspension tested, because the arrangement in solutions, the size and composition of Aspergillus niger spores were more favorable to protect the spores of the chemical and the electrical stressing. The results showed that there is a synergistic effect between the active substances from the disinfectant, fungal suspensions and applied potential, thus this effect can be taken into consideration for the hygienic and safety food industry.     

用试片法测量管道的极化电位

本文通过分析管道极化电位的测量原理，论述了用试片法进行管道断电点位的测量方法，详细介绍了如何确定自然电位以及测量中需要注意的问题。