PVD工艺对IGZO薄膜结晶化的影响

在G4.5实验线上, 采用射频磁控溅射法, 通过优化成膜时的温度、功率、气体流量比、退火温度和膜层厚度等参数, 以XRD, HR-TEM, NBED 和EDS进行表征, 研究制备结晶IGZO的工艺参数及其对薄膜晶体管(TFT)电性的影响。结果表明, 当IGZO膜层厚度达到3000 ?以上时结晶效果明显, 且不受其他因素影响; 成膜功率对IGZO结晶现象有加强作用, 功率越高越易结晶; 成膜温度和氧气/氩气(O₂/Ar)气体比例对IGZO结晶影响不大; 成膜完成后经过600℃的退火处理可有效地促进IGZO的再结晶。通过优化IGZO成膜条件, 制备出迁移率达29.6 cm²/(V·s)的背沟道刻蚀结构IGZO TFT, 比非晶IGZO TFT提高约3倍, 显著地改善了IGZO TFT的电学特性。     

高耐热环氧树脂杂化体系研究

线性异氰酸根封端的聚氨酯酰亚胺(PUI)结合了聚氨酯和聚酰亚胺的优点,由聚氨酯预聚物和均苯四甲酸二酐直接合成.将笼型倍半硅氧烷(POSS)和PUI一同加入到环氧树脂(EP)中制备了一系列EP/PUI/POSS有机-无机纳米复合材料,以提高材料的耐热性和强度.使用TGA、DMA等方法对材料进行了研究,结果表明其热稳定性和力学性能都有显著提高.     

广州市住宅室内、外PM2. 5 中碳污染来源解析

旨在对大气PM2.5中碳污染来源进行解析,以寻求科学合理的预防与污染控制对策.在广州市9个居民住宅的室内、室外同步采集了PM2.5样品,对PM2.5中有机碳(OC)、元素碳(EC)组分采用热光反射分析法(TOR)分析.IMPROVE-TOR法分析OC、EC的过程中,根据固定的温度梯级将OC和EC区分为8个组分(OC1、OC2、OC3、OC4、EC1、EC2、EC3和OPC). 分析了广州市9个采样住宅夏、冬季室内和室外PM2.5中8个碳组分占总碳(TC)的平均丰度及其规律和启示.采用因子分析法对PM2.5中碳污染主要来源的定量贡献进行解析,找出广州市PM2.5中碳污染主要来源及其贡献率.采用简化模型,对室内OC、EC源对室内总碳的相对贡献率,室外OC、EC源对室内总碳的相对贡献率进行了定量化研究.     

Application of Standardization for Initial Design of Plastic Injection Moulds

Today, the time-to-market for plastic products ar e getting shorter, thus the lead-time for making the injection mould is decreasin g. There is potential in timesavings in the mould design stage because the design process that is repeatable for every mould design can be standardized. T he preliminary work of any final plastic injection mould design is to always pro vide an initial design of the mould assembly for product designers (customers) p rior to receiving the final product CAD data. Traditiona...     

Extrusion Freeforming of Millimeter-Wave Electromagnetic Bandgap (EBG) Photonic Crystals

Extrusion freeforming can be used for the rapid prototyping of millimeter-wave electromagnetic bandgap (EBG) structures. In this work, an alumina-polymer paste with a relatively high volatility solvent (propanol) was used and the characteristics of the ceramic paste, particularly the rheological features are described. The advantage of high volatility solvent is that the viscosity and elastic modulus of the paste are increased sharply as the solvent evaporates. Thus, the rigidity of the extruded filament is quickly increased as a small amount of solvent evaporates. Finally, by employing this procedure, different EBG structures such as 2-D, 3-D woodpile and aperiodic structures were fabricated and their bandgaps were measured. The experimental results show that extrusion freeforming is a relatively simple and easy method to fabricate these woodpile structures with a bandgap in the 90-110 GHz region.     

Development operators on 4D moving object databases

In this paper we propose four-dimensional (4D) operators, which can be used to deal with sequential changes of topological relationships between 4D moving objects and we call them 4D development operators. In contrast to the existing operators, we can apply the operators to real applications on 4D moving objects. We also propose a new approach to define them. The approach is based on a dimension-separated method, which considers x-y coordinates and z coordinates separately. In order to show the applicability of our operators, we show the algorithms for the proposed operators and development graph between 4D moving objects.     

半导体晶圆制造系统的时变多目标生产调度优化

从当前半导体晶圆制造企业实际生产调度的角度出发,根据模糊控制理论和模拟退火算法,提出了解决半导体晶圆制造系统(SWFS)时变多目标生产调度复杂问题的方法.大量的仿真实验数据证明,该方法可以在求解速度和优化质量间取得平衡,并实现了全局优化效果,为实现SWFS的科学生产控制与调度提供了有效策略和方法.     

高师教育实习用反思促进成长

教育实习是高师院校师范生培养的重要环节,师范生学会用反思关注自己的实习生活是促进其成长和发展的必由之路.反思是一个能动的、审慎的认知加工过程,师范生应该主动采用内省、讨论、撰写实习日志和实习总结等方法进行反思,反思自己的职业信念、教育理念、知识水平和教学能力水平,让反思贯串于实习的整个过程,以促进师范生的专业发展和未来职业成长.     

Distributed location-based query processing on large volumes of moving items

Recently, new techniques to efficiently manage current and past location information of moving objects have received significant interests in the area of moving object databases and location-based service systems. In this paper, we exploit query processing schemes for location management systems, which consist of multiple data processing nodes to handle massive volume of moving objects such as cellular phone users.To show the usefulness of the proposed schemes, some experimental results showing performance factors regarding distributed query processing are explained. In our experiments, we use two kinds of data set: one is generated by the extended GSTD simulator and another is generated by the real-time data generator which generates location sensing reports of various types of users having different movement patterns.