Wide-gap layered oxychalcogenide semiconductors: Materials, electronic structures and optoelectronic properties

Applying the concept of materials design for transparent conductive oxides to layered oxychalcogenides, several p-type and n-type layered oxychalcogenides were proposed as wide-gap semiconductors and their basic optical and electrical properties were examined. The layered oxychalcogenides are composed of ionic oxide layers and covalent chalcogenide layers, which bring wide-gap and conductive properties to these materials, respectively. The electronic structures of the materials were examined by normal/inverse photoemission spectroscopy and energy band calculations. The results of the examinations suggested that these materials possess unique features more than simple wide-gap semiconductors. Namely, the layered oxychalcogenides are considered to be extremely thin quantum wells composed of the oxide and chalcogenide layers or 2D chalcogenide crystals/molecules embedded in an oxide matrix. Observation of step-like absorption edges, large band gap energy and large exciton binding energy demonstrated these features originating from 2D density of states and quantum size effects in these layered materials.     

宝钢1580热轧精轧机辊缝零调研究

针对宝钢分公司1580热轧精轧机辊缝零调过程中出现的一些问题,比如轧制力偏差大、辊缝预埋不准确、零调过程受人为因素影响而无法确定统一标准等进行了研究,并提出了解决方案.通过对轧机的刚度实验,找出了轧制力和油柱值之间的线性关系,以此实验数据为基础,改进辊缝零调控制程序,实现了轧制力静偏差的自动调平,零调辊缝的自动预埋等目标.同时通过完善转车联锁条件,杜绝了零调过程中的人为误差.改进前后精轧机辊缝零调数据的对比表明,达到了改进的预期效果,解决了现场存在的实际问题.     

济钢板坯连铸机智能扇形段(ASTC)电气控制系统的应用

济南钢铁集团总公司第三炼钢厂1#连铸机由奥钢联公司设计制造,其扇形段共14段,其中水平段(7-14段)采用智能扇形段(ASTC)。智能扇形段电气控制系统具有严密的控制逻辑及可靠的控制精度,通过对水平段辊缝的实时动态控制,可有效提高扇形段辊缝的控制精度,提高了铸坯质量。     

感应加热高强度包装钢带生产线及工艺技术特点

介绍了唐山钢铁集团有限公司建的国内第一条感应加热高强度包装钢带生产线主要设备及技术工艺特点。     

动态轻压下技术在板坯连铸的应用

介绍了攀钢新建2#板坯连铸机扇形段和轻压下控制系统,对系统的组成、功能及实现作了简要阐述。控制系统的成功应用,改善了铸坯内部质量,减少了中心偏析和疏松,为实现高效连铸起到了重要作用,同时为攀钢三期建设工程顺利达产提供了保障。     

Effect of Hot Band Annealing on Magnetic Properties in 3% Si Grain‐oriented Electrical Steels

Hot band annealing is known to be a prerequisite for good magnetic properties irrespective of manufacturing methods in grain‐oriented Fe‐3 wt.% Si electrical steels. In this study, the effects of hot band annealing on magnetic properties were investigated in 3% grain‐oriented electrical steels of low soluble AI contents and one‐stage cold rolling. Microstructure and precipitate distribution were compared with hot band annealing conditions. Secondary recrystallization behaviour with hot band annealing condition was also discussed.     

视图匹配中的定位技术

提出了一种基于不确定推理的视图匹配定位方法,并将其应用于计算机绘图自动评卷系统中。该方法在正式进行视图匹配前,先通过图元间的比较,找出待匹配视图间所有可能的相对位置,并通过计算找出其中最为可能的相对位置作为两视图的正确相对位置,以这一相对位置为基准进行后续的图元匹配。该方法在评卷系统的实际应用中效果良好。     

低能带隙聚合物的设计

低能带隙聚合物对光电器件具有重要的意义。综述了低能带隙聚合物的设计方法和思路．包括聚合物取代基修饰、降低链中交替单双键键长的差异、给体一受体的规整交替，以及梯形聚合物的合成。     

论城市品牌与商品品牌的联系和区别

从品牌的概念和内涵出发,探究了城市品牌和商品品牌的内涵,并将两者加以比较,从中找出它们的联系和区别,为城市形象塑造的研究提供了理论基础和铺垫.     

浅谈混凝土的温度裂缝

经多年的施工监理实践,在查阅有关混凝土内部应力方面的专著后,对混凝土温度裂缝产生的原因、现场混凝土温度的控制和预防混凝土温度裂缝的措施进行阐述。