二维V2O5薄膜的制备及其气敏反射光学特性研究

介绍了用溶胶凝胶法制备二维V2O5光学薄膜,并研究其在氨气、乙醇、丙酮、丁烷气氛中的气敏反射特性,发现对氨气有极好的选择性,且气敏性在整个可见光波段有良好的单值性,是一种有实用价值的气敏光纤传感材料.     

CO2气层录井识别影响因素分析与解释评价

松辽盆地南部深层天然气储集层富含CO2,随着勘探的深入进行,CO2气层的录井识别与评价难题已突显,主要表现为异常发现和分层困难,无法定量评价。从CO2特殊的物理化学性质分析入手,通过实验分析,确认了CO2气层录井出现分层和评价困难的主要原因是CO2在水中的高溶解度、高扩散性和溶于水后产生的弱酸性。进一步通过研究CO2与甲烷录井密切的伴生关系以及甲烷气的录井显示灵敏性,结合钻时、CO2与甲烷的相对含量高低等录井参数,在现有技术条件下,初步建立了CO2气层的录井识别评价方法。     

Forecast and evaluation of hot dry rock geothermal resource in China

Utilizing information from plate tectonics characteristics, volcanic activities, and geothermal anomaly, this paper identifies areas where hot dry rock (HDR) may exist as potential geothermal resource in China. Further investigations are also carried out in the paper based on results from regional tectonics, volcanic geology and lithology, as well as data from geothermal displays, geochemistry, geophysics, and shallow borehole temperature measurements. The study reveals several promising areas of HDR geothermal resource in China, including Tengchong of Yunnan province, Qiongbei of Hainan province, Changbaishan of Jilin province, Wudalianchi of Heilongjiang province, and the Southern Tibet area. A 3D static heat conduction model was developed to study the underground temperature gradient characteristics of the Rehai geothermal field in Tengchong and the Yangbajing geothermal field in Tibet. The model adopted is a geological block 10 km deep from the ground surface and 50 km wide in each of the horizontal directions (2500 km² area). The numerical simulation results in evaluations on the quantities of the HDR geothermal resource in Rehai and Yangbajing geothermal fields. The paper shows that there is abundant HDR geothermal resource with large exploitation value in China. If developed with a power capacity of 1×10⁸ kW, the Rehai and Yangbajing fields along would be able to generate electricity for 1560 years.     

Effect of structure on porous gas-diffusion electrodes for phosphoric acid fuel cells

This investigation is concerned with the variation of structure in the catalyst layer for porous gas-diffusion electrodes. The pore-size distribution and the total pore volume of the electrode are measured by a mercury penetration method. A model that accounts for this incomplete wetting electrode is solved by an orthogonal collocation method and matched with experimental observations. The numerical solution indicates that the effectiveness factor drops noticeably under high current density when the agglomerate radius is greater than 40 μm. When the agglomerate radius is smaller than 1.2 μm, however, the effect of ionic transport becomes important. The maximum reaction rate occurs at carbon-paper/ catalyst-layer interface when the effective conductivity of the electrolyte is larger than that of the solid phase. If the effective conductivity of the electrolyte is smaller, then the maximum reaction rate occurs at the electrode/electrolyte interface.     

A Novel SAO-based Filtering Technique for Reduction in Temporal Flickering Artifacts in H.265/HEVC

This paper presents a novel filtering technique based on sample adaptive offset (SAO) in H.265/high-efficiency video coding (HEVC) for reduction in the temporal flickering artifacts and improving the coding performance. SAO is a newly introduced technique for in-loop filtering in H.265/HEVC, which derives the offsets independently for each frame in the spatial domain without considering temporal frame correlation. As a result, the temporal distortion artifacts which will have a negative effect on the subjective quality, such as flickering artifacts, cannot be effectively addressed. In this paper, the rate-distortion optimization of the newly developed SAO method, referred to as Inter-SAO, is performed on the residual samples between adjacent frames. Inter-SAO and SAO in the reference software of H.265/HEVC (i.e., the test model HM) are then combined to form the novel in-loop filter-based method, denoted as 3D-SAO filtering method, where both spatial information and temporal information are effectively utilized to reduce the overall distortion in reconstructed videos. Compared with the SAO in HM, 3D-SAO has demonstrated its advanced performance for flickering artifacts suppression. Furthermore, 3D-SAO improves the coding efficiency compared with the SAO in HM with a performance gain of up to 0.91 dB in \(\Delta PSNR\), 1.74 dB in \(\Delta PSPNR\) and 7.33 % in BD-rate reduction.     

一种基于QoS的QoE到SLA映射方法

该文提出一种算法IQoE2QoS(Improved QoE to QoS),采用模糊理论的方法计算QoE到QoS的映射。该算法有3重目标：从大量的经验数据中通过计算互信息量方式总结被统计指标之间的关联程度。在大量经验数据的基础上通过多指标模糊判定理论将用户感知映射到应用层用户QoS参数。考虑了用户的QoE和QoS的双向映射,并且阐述了得到的QoE如何自然映射到SLA(Service Level Agreement)。通过仿真表明,IQoE2QoS算法对用户体验的分类准确度是线性回归算法的2到3倍。     

阵列位相环匀光器

基于衍射光学中的角谱理论,针对一种分布为同心3环、相位为0.9π,0和0.9π的结构进行深入分析,提出一种10×10的3环2值位相环阵列结构,并与二元光学中的10×10的菲涅尔波带片阵列结构进行比较,应用MATLAB软件仿真632.8nm激光器的高斯光通过二者后的效果。结果表明,阵列3环2值位相环对高斯光的匀光效果要明显优于阵列菲涅尔波带片,该阵列可以对激光束在远场的衍射光场进行修正,能较大地改善高斯光的匀光效果,在光均匀性要求较高的场合具有广泛的应用前景。     

高密度Si基半导体电容器的性能及其制作

随着各种混合信号电路的性能和集成度的迅速提高以及对电路模块和元器件小型化的需要,集成无源技术成为一种取代分立无源器件以达到小型化的解决方案。鉴于电容器被广泛用于滤波、调谐和电源回路退耦等各种板级集成封装中,采用Si MEMS工艺,在半导体表面深刻蚀三维(3D)图形以增大有效表面积,制作了一种高电容密度的半导体pn结退耦电容器,并分析研究了其主要制成工艺和性能。结果显示,所制作的电容器的电容密度达8～12nF/mm2,相比无表面三维刻蚀图形的半导体电容器电容密度增大了10倍以上,退耦频率范围为10kHz～3.2GHz,可用于中低频率较大范围内的退耦。     

圆柱工件几何参数的自动测量研究

针对圆柱工件在实际测量过程中测量速度慢、精度低的实际情况,本文介绍了一种利用几何位移光学精密测量完成圆柱工件几何参数测量的方法。该系统由机械系统、运动控制和数据采集系统、数据处理系统组成;利用激光位移传感器非接触测量的特点,对圆柱工件外表面几何信息进行采集;根据最小二乘法原理,计算机对测量数据进行处理,从而得到圆柱工件的外径、同轴度、高度等几何参数。该方法通过实验验证,目前已应用于生产中。     

案例教学法在电机与拖动教学中的应用研究

针对自动化专业电机与拖动专业课课堂教学中的常规教学法,提出了"案例式"教学法。相对于常规教学法中学生被动地接受教师传授的知识的缺点,"案例式"教学法能让学生主动接受教师所传授的知识,激发学生学习的积极性,同时能提高学生课堂听课效率。