铂热电阻的接线造成温度失真现象的研究

项目推广中发现很多矿井主通风机的监测温度经常出现不同程度的虚高现象,分析其原因是测温线路的接线引起了较大的温度误差。文章对测温线路进行了理论分析,并通过实验得出导线电阻的大小对温度影响的关系。     

一种压电单晶矢量水听器的性能建模与分析

针对加速度型矢量水听器在低频段灵敏度偏低问题,根据铌锌酸铅-钛酸铅(PZN-PT)压电单晶的性能特点,设计了一种双悬臂梁结构压电单晶矢量水听器。建立了有限元模型,对矢量水听器的振动模态和接收性能进行了仿真计算,重点分析了几个主要材料和尺寸参数对水听器自由场灵敏度的影响。理论计算表明,采用压电单晶PZN-PT的矢量水听器经优化后其灵敏度可达-190 dB@250 Hz,与压电陶瓷PZT-5A的水听器相比,灵敏度提升了15 dB以上。     

Realizing the invariant electrostrain response and low hysteresis via multicomponent coordination in Pb-based ceramics

High-performance piezoelectric materials are essential in many piezoelectric devices. However, the composition of piezoelectric materials usually has a great influence on their performance. In this work, xBi(Mg_1/2Ti_1/2)O₃–yPbZrO₃–zPbTiO₃ (xBMT–yPZ–zPT; 0.2 ≤ x ≤ 0.4, 0.25 ≤ y ≤ 0.4, and 0.35 ≤ z ≤ 0.4) ternary ceramics with different compositions were synthesized and it was found that the strain response was not sensitive to the composition. The crystal structure, strain response, ferroelectric properties, and temperature stability of xBMT–yPZ–zPT ceramics were investigated in detail. X-ray diffraction patterns show that all the as-prepared xBMT–yPZ–zPT ceramics with x = 0.2, 0.3, 0.4, and 0.5 possess a perovskite structure. Under an external electric field of 6 kV mm⁻¹, the strain values of xBMT–yPZ–zPT ternary ceramics with x = 0.2, 0.3, 0.4, and 0.5 were 0.30%, 0.31%, 0.30%, and 0.27%, respectively. In addition, the strain hysteresis of these ternary ceramics is also almost the same and low. These merits make xBMT–yPZ–zPT piezoelectric ceramics have broad application prospects in the field of commercial actuators.     

PT/BADCy/PASF三元树脂体系耐热性能的研究

首先研究了PT/BADCy二元树脂体系的力学性能和耐热性能,结果表明：BADCy的加入可以改善PT树脂韧性,体系中PT树脂比例越高,灼烧后混合树脂的残留率越高.还重点研究了PT/BADCy/PASF三元树脂体系,力学分析表明：PASF的加入,大大提高了体系的韧性,当含量为10％wt时,常温、200℃以及300℃剪切强度分别为20.88、22.78、14.36MPa,90°常温剥离强度为26.89N/cm.热学分析表明：不同含量PASF的三元树脂体系的热降解趋势基本一致,高温灼烧后残留率大致相同.PASF树脂的耐热性、耐灼烧型与PT/BADCy相当,三者可以实现理想匹配.     

PT铁磁谐振分析及微机消谐装置的应用

本文对PT铁磁谐振的产生条件、谐振时的特点及其危害性作了定性分析，并针对以往消谐设备存在的问题，提出采用微机型消谐装置的有效性和实用性。     

Separation of Copper and Nickel from Ammoniacal/Ammonium Carbonate Solutions Using ACORGA PT5050

ABSTRACT

ACORGA PT5050 diluted with iberfluid (kerosene-type diluent, mostly aliphatic) was used to coextract copper and nickel from ammoniacal carbonate solutions. The influence of kinetics, temperature, equilibrium pH, and extractant concentration on the extraction of both metals has been studied. It was observed that nickel extraction is very sensitive to aqueous pH and that the extraction falls beyond an equilibrium pH of 9. For a typical solution containing near 3 g/L each of copper and nickel and 60 g/L ammonium carbonate, conditions were established for the coextraction and selective stripping of nickel and copper.     

影响PTA产品中PT酸含量高的因素及控制措施

阐述了PTA生产工艺,说明PT酸的形成和分离过程。催化剂使用初期活性强,TA中4-CBA含量高,浆料浓度高,产品粒度小,分离效果差,压力离心机走旁路等是影响PTA产品中PT酸含量的主要因素,并分析影响程度不同,根据装置实际运行参数,提出相应的控制措施,特别是压力过滤机的投用,保证了产品中PT酸低于150 mg/kg。     

磁弹性传感器芯片用于凝血酶原时间检测的初步研究

设计了一种集成流路的磁弹性传感器芯片,结合模块化设计的磁弹性传感器检测电路构成了一个初步的实验平台,针对在医学和临床实践中都有很重要意义的凝血系统功能的检查,以凝血酶原时间(PT)为例,利用磁弹性传感器芯片进行凝血酶原反应的过程检测,可以得到凝血酶原时间参数.初步实验结果证明了设计的有效性,同时,这种方法可以方便推广到其他凝血因子的检测方面,是一种可小型化、便携式、芯片成本低廉的易于推广的解决方案,有很好的应用前景.     

压电复合材料PT－P（VDF／TeFE）的静水压压电性

用热轧辊机制备了压电复合材料ＰＴ－Ｐ（ＶＤＦ／ＴｅＦＥ），并利用ＬＣＲ电桥和Ｂｅｒｌｉｎｃｏｕｒｔ电路分别测量了其介电常数和压电常数，实验结果表明它具有良好的静水压压电特性。最后讨论了该复合材料在水听器中的应用