热断层(TTM)技术对睡眠质量的评估与探讨

本文的目的是探讨利用热断层(TTM)技术对睡眠质量进行评估的方法及其应用价值。采用的方法是对281位体检客人进行睡眠质量评估,以客人详细主述记录为对照。结果,被TTM诊断为有睡眠障碍的有119例,有主诉睡眠障碍的有122例,检出率为97．5％。由此可得出这样的结论:TTM对睡眠质量的评估简单快速,准确率高,具有直观实用的诊断价值。     

相控阵雷达子阵的热设计

针对相控阵雷达子阵系统不同的结构方案,应用热设计仿真软件建立了系列热仿真模型。依据冷板类型、冷板安装位置、功能层类型,将系列模型分为3组,并给出了3组模型的温度剖视图和温度全图。通过对热仿真结果的对比分析,选择了能较好满足子阵热设计总体要求的结构方案。分析总结了带液冷冷板子阵系统的散热规律,为今后高功率密度和大功率器件的散热提供参考。     

热障涂层的CMAS腐蚀失效及对策研究综述

研制具有长寿命、高性能的热障涂层（TBCs）,是制造我国大功率航空发动机、发展新一代超音速战机的一项十分紧迫的任务。由于外来沉积物CaO-MgO-Al2O3-SiO2（CMAS）渗入涂层而导致TBCs失效的现象越来越受到人们的重视,在过去的一段时间里,很多学者对CMAS渗入后涂层的失效机理进行了大量的研究并尝试了一些缓解CMAS渗入涂层的方法。本文针对当前应用最为广泛的“层状多孔结构”的等离子喷涂涂层及“细长柱晶结构”的电子束辅助物理气相沉积涂层,系统地梳理了近年来国内外学者对TBCs在CMAS渗入条件下的失效机制及涂层缓解CMAS渗入方面的最新研究成果,为制备高性能的TBCs提供帮助。     

热重法确定MMH微晶中各种水分的相对含量

借助热分析仪对MMH微晶进行了TG和DTG分析,研究了MMH微晶中各种水分的相对含量。提出MMH微晶中存在4种水分,即自由水、松散吸附水和紧密吸附水、结晶水和羟基水,给出了MMH微晶的完整表达式,即 MgAl_(0.965)(OH)_(4.75)Cl_(0.145·1.70)H_2O。     

PECVD SiN 应力特性的研究

用自制的激光束偏转法测量衬底形变弯曲系统,测量了等离子增强化学汽相淀积(PECVD)SiN 膜的应力,反应气体为硅烷和氮气,结果表明:SiN 的应力为压应力,介于1～3×10~9N/m~2,应力的大小依赖工艺条件,如淀积温度、气体组分等,SiN 的本征应力也是压应力,数值为1.1×10~9N/m~2,最后,建立了用于解释本征应力的定性模型——等效晶粒模型,成功地说明了 SiN 膜的应力形成。     

Steady thermal hydraulic analysis for a molten salt reactor

The Molten Salt Reactor (MSR) can meet the demand of transmutation and breeding. In this study, theoretical calculation of steady thermal hydraulic characteristics of a graphite-moderated channel type MSR is conducted. The DRAGON code is adopted to calculate the axial and radial power factor firstly. The flow and heat transfer model in the fuel salt and graphite are developed on basis of the fundamental mass, momentum and energy equations. The results show the detailed flow distribution in the core, and the temperature profiles of the fuel salt, inner and outer wall in the nine typical elements along the axial flow direction are also obtained.     

变压器绕组温度计异常的原因及改进建议

介绍了9F燃机发电机主变压器的绕组温度计异常现象的分析和处理及绕组温度测量的热模拟法和改进建议.     

Electrodeposition and characterization of nano-crystalline antimony telluride thin films

Electrodeposition is a promising low-cost method to fabricate nanostructured thermoelectric thin films such as Sb₂Te₃. However, electrodeposition of crystalline Sb₂Te₃ without the need for additional processing and with good compositional control has presented a challenge. Here we report on the electrodeposition of crystalline Sb₂Te₃ thin films at room temperature from a tartaric-nitric acid electrolyte using a pulsed, potentiostatic process. The effects of synthesis conditions on the resulting microstructure and compositional homogeneity are investigated using x-ray diffraction, electron diffraction, electron microscopy, and energy dispersive x-ray spectroscopy. The composition of the Sb-Te films was found to be dependent on the interval between pulses, a result that is likely due to the slow kinetics associated with Sb₂Te₃ formation at the surface. We also observed a change in texture and microstructure with varied applied pulse duration: for short pulse durations a lamellar microstructure with a {000?} texture forms, whereas for longer pulse durations a more equiaxed and randomly oriented microstructure forms. The thermal conductivities of the pulsed electrodeposited films are surprisingly low at less than 2 W/K·m and are found to systematically decrease with reduced pulse time.     

Effect of Ar annealing temperature on SiO2/4H-SiC interface studied by spectroscopic ellipsometry and atomic force microscopy

The authors have investigated the effects of different annealing temperatures in Ar atmosphere on the SiO₂/4H-SiC interfaces by spectroscopic ellipsometry (SE) and atomic force microscopy (AFM). There is a strong correlation between the annealing temperatures and the quality of SiO₂/4H-SiC interface. Annealing at 600 °C can significantly improve the quality of SiO₂/4H-SiC interface with no transition layer. The reasons for such improvement in the quality of the SiO₂/4H-SiC interface after moderate temperature annealing at 600 °C may be explained by the formation and consumption of carbon clusters and silicon oxycarbides during annealing.     

P3HT based solution-processed pseudo bi-layer organic solar cell with enhanced performance

We present a solution-processed pseudo bi-layer organic solar cell with poly(3-hexyl thiophene) (P3HT) as donor and indene-C₆₀ bisadduct (ICBA) as acceptor. The devices were fabricated by sequential processing of the active components followed by a thermal annealing treatment. An efficiency of 5.9% was achieved under AM 1.5G irradiation (1000 W/m²). The obtained efficiency is attributed to an enhanced nanomorphology that arises from the inter-diffusion of the ICBA molecules into a layer of pre-organised polymer (P3HT) and also due to the subsequent crystallisation of the ICBA molecules. These processes facilitate efficient charge generation and extraction. Time of flight-secondary ion mass spectroscopy (TOF-SIMS) depth profiling was carried out for different thermal annealing treatments of these pseudo bi-layer devices, which reveals full inter-diffusion of ICBA into the polymer P3HT. Photo-CELIV (charge extraction by linearly increasing voltage) studies elucidates that the thermal annealing imparts crystallinity to the fullerene phase which results in the improvement of charge carrier mobility.