构建广州地区产学研特色区域创新体系研究

文章讨论了广州市如何在产学研环境下构建具有地方特色区域创新体系,并在分析区域创新体系的构成以及广州市产学研现状的基础上,提出广州地区构建产学研特色区域创新体系的基本思路。     

技工院校教师能力素质提升途径探析

技工院校"双师型"教师队伍建设影响着技工教育的发展。目前,在技工院校师资整体水平不高的情况下,文章就如何提升技工院校教师能力进行阐述和分析。     

继续教育质量保障体系建设的研究与实践

教学质量是教育的核心问题。继续教育的质量保障体系建设,既是继续教育服务学生、服务社会经济发展的必然需求,也是普通高校继续教育发展的自身保障。本文紧扣继续教育质量保障体系建设的工作实践,围绕继续教育现状分析、质量保障体系内涵认知、质量保障体系创建举措与特色等方面进行知行合一的研究论述。     

基于汇聚面对3D影像观影舒适性影响的研究

分析汇聚面与舒适性的关联性是研究汇聚面对3D影像观影舒适性影响的基础,通过从摄像机汇聚面参数、影像创作中的视觉语言的表现方式、3D影像的观看条件这3方面发现汇聚面对观影舒适性所产生的影响,整理汇聚面与感知深度、视差距离值、物镜间距等之间的关联依据,总结出在拍摄、非线性编辑、放映这3个环节中,汇聚面参数调整的规律和方法.通过实验获取汇聚面参数调整的有效数据范围,为制作出具有观看舒适性的3D影像作品提供了必要的依据.     

一种基于用户属性的远程证明方案

针对现有的远程证明方案中安全性差、不能反映用户特征的问题,提出了一种基于用户属性的远程证明方案。该方案在证据的可信生成与可信验证中用到了基于口令的加密(Password Based Encryption),利用可信平台模块模拟器(TPM Emulator)、Java TCG Software Stack来构建实验平台。实验结果表明,基于用户属性的远程证明方案是可行的,相对于AES加密的远程证明方案,一方面提高了证据的可信性与传输的安全性,另一方面能够反映出用户特征。     

基于多模态MRI的AD分类模型

利用多模态磁共振成像数据,构建静息态功能网络,提取了网络属性及结构像中萎缩灰质的灰质体积作为分类特征,训练SVM分类器。实验结果表明,利用结构和功能组合特征,可以区分MCI与正常对照(准确率91.7%),AD与正常对照(准确率100%),AD与MCI(准确率87.8%),有效提高了两类疾病的分类正确率。结果说明提出的分类模型是一种较好的辅助诊断模型。     

鼓式制动器制动力矩和温度测试台架的设计

基于多体动力学和斯特藩·玻尔兹曼定律,设计计算鼓式制动器制动力矩及温度测试台架,简述了传感器模块、信号处理模块、数据处理及显示终端三大模块的设计思路。与传统的试验台架相比,所设计的试验台架具有结构简单,数据采集干扰小和测量精度高的优点。     

O2含量对半焦燃烧动力学影响的热重研究

为了更进一步地清楚阐述半焦的燃烧过程,采用非等温热重法研究氧气体积分数对半焦燃烧动力学的影响。将半焦燃烧过程的第2次失重分为半焦热解脱挥发分(阶段1)、挥发分燃烧(阶段2)、挥发分燃烧且碳燃烧(阶段3)、碳单独燃烧(阶段4)4个阶段,采用Coats-Redfern法选取一级反应模型计算各个阶段的动力学参数。结果表明:24%φ(O_2)~30%φ(O_2)条件下,阶段3所需的表观活化能最小。24%φ(O_2)、26%φ(O2)、30%φ(O_2)条件下阶段4所需的表观活化能最大;28%φ(O_2)阶段2所需的表观活化能最大。     

Radiation hardness characterization of low gain avalanche detector prototypes for the high granularity timing detector

The high granularity timing detector (HGTD) is a crucial component of the ATLAS phase II upgrade to cope with the extremely high pile-up (the average number of interactions per bunch crossing can be as high as 200). With the precise timing information (σ_t～30 ps) of the tracks, the track-to-vertex association can be performed in the “4-D” space. The Low Gain Avalanche Detector (LGAD) technology is chosen for the sensors, which can provide the required timing resolution and good signal-to-noise ratio. Hamamatsu Photonics K.K. (HPK) has produced the LGAD with thicknesses of 35 μm and 50 μm. The University of Science and Technology of China(USTC) has also developed and produced 50 μm LGADs prototypes with the Institute of Microelectronics (IME) of Chinese Academy of Sciences. To evaluate the irradiation hardness, the sensors are irradiated with the neutron at the JSI reactor facility and tested at USTC. The irradiation effects on both the gain layer and the bulk are characterized by I-V and C-V measurements at room temperature (20 ℃) or ?30 ℃. The breakdown voltages and depletion voltages are extracted and presented as a function of the fluences. The final fitting of the acceptor removal model yielded the c-factor of 3.06×10?16 cm?2, 3.89×10?16 cm?2 and 4.12×10?16 cm?2 for the HPK-1.2, HPK-3.2 and USTC-1.1-W8, respectively, showing that the HPK-1.2 sensors have the most irradiation resistant gain layer. A novel analysis method is used to further exploit the data to get the relationship between the c-factor and initial doping density.     

Measuring Environmental Performance of Provincial Thermal Power Plants in China: A Malmquist DEA Approach with Fixed-Sum Undesirable Outputs

With the development of China’s economy, environmental pollution has become cumulatively serious. The primary source of environmental pollution is thermal power generation, which has attracted the attention of governments and academia in recent years. To effectively reduce environmental pollution, research should study how to constrain the undesirable output of thermal power plants, that is, to limit the total undesirable output of the plants to a certain fixed sum. However, few studies have suggested that these undesirable outputs should be fixed-sum outputs. Moreover, no previous research publication about thermal power plants has analyzed their environmental performance changes. To address these gaps, a novel Malmquist-DEA approach is proposed for evaluate the environmental performance of thermal power plants in this paper. This approach generalizes the equilibrium efficient frontier DEA model with fixed-sum undesirable outputs and incorporates the model into the Malmquist productivity index (MPI). The authors apply this approach to the analysis of provincial thermal power plant environmental performance in China and analyze such plants’ trends based on panel data from 2011 to 2014. The empirical research shows that the environmental performance of regional thermal power plants was positively affected by efficiency change and negatively affected by technical change. Finally, the authors provide policy suggestions based on our findings.