scholarly journals Negative Resistance-Temperature Coefficient of Thin Evaporated Films of Bismuth

Nature ◽  
1946 ◽  
Vol 157 (3986) ◽  
pp. 372-372 ◽  
Author(s):  
T. J. TULLEY
Keyword(s):  
Temperature Coefficient ◽  
Negative Resistance ◽  
Resistance Temperature Coefficient

Influence of Al2O3 Doping on the Microstructure and Current–Voltage Characteristics of ZnO-Based Linear Resistance Ceramics

2011 ◽  
Vol 480-481 ◽  
pp. 556-559
Author(s):  
Jian Feng Zhu ◽  
Yong Zhou ◽  
Hai Bo Yang ◽  
Fen Wang
Keyword(s):  
Electrical Properties ◽  
Temperature Coefficient ◽  
Raw Materials ◽  
Nonlinear Coefficient ◽  
Al2o3 Content ◽  
Linear Resistance ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Resistance Temperature Coefficient ◽  
Al2o3 Doping

ZnO-based linear resistance ceramics were synthesized using Al2O3 doped ZnO-based system as raw materials by sintered at 1340 °C for 3 h. The effects of Al2O3 content ranged from 1 to 15 wt% on the microstructure and electrical properties of the ceramics were investigated in detail. The results show that the electrical properties such as nonlinear coefficient, resistivity and resistance temperature coefficient have been obviously influenced by Al2O3 doping. The optimal samples obtained by doping Al2O3 with 9 wt% have a nonlinear coefficient of 1.3, resistivity of 130 (Ω•cm) and resistance temperature coefficient of -5.4×10-3/ °C.

Effect of Calcination of the Raw Materials on the Microstructure and Electrical Properties of ZnO-Based Linear Resistance Ceramics

2012 ◽  
Vol 724 ◽  
pp. 327-330
Author(s):  
Jian Feng Zhu ◽  
Yong Zhou
Keyword(s):  
Electrical Properties ◽  
Temperature Coefficient ◽  
Raw Materials ◽  
Nonlinear Coefficient ◽  
Ceramic Method ◽  
Linear Resistance ◽  
Resistance Temperature Coefficient

ZnO-based linear resistance ceramics were fabricated by the conventional ceramic method. The effect of calcination of the raw materials on the microstructure and electrical properties was investigated in detail. The results show that the electrical properties, such as resistivity, nonlinear coefficient and resistance temperature coefficient, have been obviously influenced by the calcining process. The optimal samples fabricated with the materials calcinated for twice possess the highest stabilization of resistivity. Meanwhile, the resistance temperature coefficient is improved by 30%, and the nonlinear coefficient of voltage decreases to 1.16, decreased by 20.7%.

An hourglass-type electromagnetic isolator with negative resistance electromagnetic shunt circuit

2020 ◽  
Vol 64 (1-4) ◽  
pp. 549-556
Author(s):  
Yajun Luo ◽  
Linwei Ji ◽  
Yahong Zhang ◽  
Minglong Xu ◽  
Xinong Zhang
Keyword(s):  
Vibration Isolation ◽  
Electromechanical Coupling ◽  
Coupling Effect ◽  
Negative Resistance ◽  
Isolation System ◽  
Amplitude Vibration ◽  
Vibration Responses ◽  
The Stability ◽  
Isolation Performance ◽  
Shunt Circuit

The present work proposed an hourglass-type electromagnetic isolator with negative resistance (NR) shunt circuit to achieve the effective suppression of the micro-amplitude vibration response in various advanced instruments and equipment. By innovatively design of combining the displacement amplifier and the NR electromagnetic shunt circuit, the current new type of vibration isolator not only can effectively solve the problem of micro-amplitude vibration control, but also has significant electromechanical coupling effect, to obtain excellent vibration isolation performance. The design of the isolator and motion relationship is presented firstly. The electromechanical coupling dynamic model of the isolator is also given. Moreover, the optimal design of the NR electromagnetic shunt circuit and the stability analysis of the vibration isolation system are carried out. Finally, the simulation results about the transfer function and vibration responses demonstrated that the isolator has a significant isolation performance.

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