Molecular design of deep blue fluorescent emitters with 20% external quantum efficiency and narrow emission spectrum

A thermally activated delayed fluorescent (TADF) emitter, 2,7-bis(9,9-dimethylacridin-10(9H)-yl)-9,9-dimethyl-9H-thioxanthene 10,10-dioxide (DMTDAc), was developed as a deep blue TADF emitter using a rigid 9,9-dimethyl-9H-thioxanthene 10,10-dioxide (DMTD) acceptor and an acridine donor. The rigid DMTD acceptor narrowed emission spectrum of DMTDAc by interlocking two phenyl units of diphenylsulfone. A deep blue TADF device with an external quantum efficiency close to 20% with a deep blue color coordinate of (0.15,0.13) was provided using the DMTDAc TADF emitter.     

基于硅衬底静电感应晶体管器件仿真与研究

针对静电感应晶体管理论研究迟滞于实践过程,文中利用软件Silvaco Tcad,从器件仿真入手,对影响硅基表面栅静电感应晶体管器件电学性能进行了理论研究。仿真得到了反偏栅压约为0 V、漏电压＜20 V时,器件表现类五极管饱和特性曲线,器件电流约为10-5 A,此时沟道状态为预夹断。当反偏栅压为-1.5 V、漏电压逐渐增大到300 V时,器件表现为类三极管不饱和特性曲线,器件电流约为10-6 A,此时沟道状态为完全夹断,研究结果静电感应晶体管工艺实践提供了参考。     

Localization of temperature sensitive areas on analog circuits

We introduce a novel easy to apply method to detect critical temperature sensitive areas on analog circuits. Our method is based on heat diffusion on a silicon micro-chip: the corners of a temperature sensitive micro-chip are heated up directly by ESD diodes or infrared laser light. This heat stimulus at the corners results in an inhomogeneous temperature distribution. Thus, the temperature is a function in time and space. The elapsed time to change the chip status from “fail” to “pass” as a reaction to the heat stimulus correlates with the distance to the heat source. This correlation is extracted from COMSOL simulations and experimental results. A numerical program based on that correlation succeeded in localization of the temperature sensitive chip module.Micro-chips affected by corner MOSFETs in the subthreshold regime are used to demonstrate our method.     

提高本安火花试验装置灵敏度的方法研究

为提高本安火花试验装置的灵敏度,提高检验效率,基于火花试验装置的结构及标定电路要求,通过合理制备和清理钨丝、调试镉盘、改善装置回路参数,以及应用流量法配气、扫气法进气的配气方式,保证所配制的混合气体的浓度,提高混合气体均匀度等方法来提高本安火花试验装置的灵敏度,并对每种方法作了详细介绍。实践证明,综合运用以上方法能够很好地提高装置的灵敏度,大幅提升本质安全型设备的检验效率及检验质量。     

ZZ9900/29.5/50型支架护帮装置限压阀板的改进

对ZZ9900/29.5/50型支撑掩护式大采高液压支架护帮装置限压控制系统限压阀板存在的缺陷进行了分析、改进.     

高速电梯补偿绳张紧装置设计中的两个问题

针对高速电梯补偿绳张紧装置，提出了补偿绳张紧重量的计算和选取方法。详细分析了电梯紧急制动状态下补偿绳张紧装置及防跳装置的工作状态，并建立了相应的动力学方程，通过相关数学推导和分析得出了防跳装置动作反力的计算方法。     

Single‐Stage ZVS‐PWM AC‐AC Power Converter Using All SiC Power Module for High‐Frequency Induction Heating Applications

This paper presents a novel prototype of a single‐stage zero voltage soft‐switching pulse‐width modulation ‐controlled ac‐ac converter with a silicon carbide (SiC)‐MOSFET/SiC‐SBD power module for high‐frequency (HF) induction heating (IH) applications. The newly developed ac‐ac converter can achieve higher efficiency than a Si‐IGBT/Si‐PN diode power module‐based prototype due to a low ON‐resistance of SiC‐MOSFET and a low forward voltage of SiC‐SBD under the condition of HF switching. The performances of the new prototype converter are evaluated by experiment with a single‐phase IH utensil of ferromagnetic stainless metal, after which the high‐efficiency and low switching noise characteristics due to the all SiC power module are actually demonstrated.     

冷轧机组斜楔调整装置的应用及故障分析

介绍了冷轧机组斜楔调整装置在应用中出现的故障，通过实践提出了故障排除方法，对于采用斜楔装置作调整执行机构的机械设备有较大的借鉴意义。     

Excitation of piezoelectric device through resonant helical coil antenna-like structure

A resonant helical coil antenna-like structure has been explored for wireless excitation of piezoelectric devices. The basic idea behind this wireless excitation of piezoelectric device is electromagnetic resonance along with piezoelectric resonance. The analytical studies reveal that the maximum excitation occurs in the piezoelectric device when the operating frequency of the system coincides with its mechanical resonant frequency. It has been seen that the intensity of piezoelectric stimulation depends on the frequency of operation, air gap, relative position, electric load, and the generated electric field strength by the helical coil antenna-like structure. The analytical results are verified with the measured experimental results, and are found to be in well agreement. By adopting this proposed wireless excitation system the free actuation of the piezoelectric devices can be enabled as opposed to the confined motion for various potential applications.