The Smart Behavior of Cement-based Composite Containing Carbon Fibers under Three-point-bending Load

1Introduction Intrinsicconductivecementbasedcompositeshavereceivedmuchattentionduringthelastdecades,becauseoftheirinterestingpotentialapplication,suchasbeingutilizedforthenondestructionoftheintegrityofconcretestructures,electromagneticinterferenceshieldin…     

添加导电纤维对羰基铁粉吸波性能的影响

本文研究了在羰基铁粉(CIP)吸波涂层中添加导电纤维对涂层的电磁参数和反射率的影响规律.发现导电纤维的添加使磁性金属微粉CIP吸波涂层的介电常数增大,使得吸波涂层的吸收峰向低频移动,有利于改善低频段的吸收效果;利用分块设计的方法可以拓宽吸波材料在全波段(2～18GHz)范围内的吸收频带;同时导电纤维的加入还降低了吸波涂层的面密度.     

Effect of CeO2 on Electrical Properties of （Nb, Mn）-Doped TiO2 Varistor Ceramics

Varistor ceramics are a class of semiconductor de-vices with high non-linearity in their current-voltage(V-I)characteristics.Among these,ZnO varistor isthe most typical material and is commercially used asvoltage suppressor to protect electronic componentsand power systems[1~4].However,ZnOis a kind ofpure resistance component and has low permittivity,high dielectric dissipation,lowresponse speed,andpoor ability to absorb high frequency noise and pulsesurge.Soits applicationis restrictedin el…     

Satellite-Based Energy Balance to Assess Within-Population Variance of Crop Coefficient Curves

Quantifying evapotranspiration (ET) from agricultural fields is important for field water management, water resources planning, and water regulation. Traditionally, ET from agricultural fields has been estimated by multiplying the weather-based reference ET by crop coefficients (Kc) determined according to the crop type and the crop growth stage. Recent development of satellite remote sensing ET models has enabled us to estimate ET and Kc for large populations of fields. This study evaluated the distribution of Kc over space and time for a large number of individual fields by crop type using ET maps created by a satellite based energy balance (EB) model. Variation of Kc curves was found to be substantially larger than that for the normalized difference vegetation index because of the impacts of random wetting events on Kc, especially during initial and development growth stages. Two traditional Kc curves that are widely used in Idaho for crop management and water rights regulation were compared against the satellite-derived Kc curves. Simple adjustment of the traditional Kc curves by shifting dates for emergence, effective full cover, and termination enabled the traditional curves to better fit Kc curves as determined by the EB model. Applicability of the presented techniques in humid regions having higher chances of cloudy dates was discussed.     

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.     

遥感信息与地球物理信息相关性探讨 --铀资源勘查后遥感应用技术理念的信息相关性研究内容之初探

本文从铀资源勘查后遥感应用技术的研究内容出发，着重从物理意义相关性、反映地质规律深度相关性、时态相关性、平面赋存规律相关性，以及信息相关性的作用机理等5个方面对遥感信息与重力、航磁、航放等地球物理信息之间的相关性进行了初步探讨，为今后从定性和定量角度深入研究后遥感应用技术中遥感信息与其他地学信息之间的相关性开创了一个良好的开端。     

获取城镇空间基础影像信息的低空遥感

城镇是国家或地区的先进生产力、先进文化、先进思想的活动中心,是现代社会的主要结点。要实现对城市的现代化管理,促使其可持续发展,就得建设城镇信息系统。城镇影像信息是构筑城镇信息系统(数字城市)的核心数据。由超轻型飞机、热气飞艇、GPS接收机、航空摄影仪集成的低空遥感平台系统,用于获取城镇影像信息,经过数十次实践检验,技术性能指标能满足遥感应用和测绘成图精度要求。特别适用于中小城镇和大城市局部地区以及大型工程项目的大比例尺高分辨率摄影遥感。在具体运作中具有机动灵活、快速反应的能力,可操作性强,有较高性能价格比的优势,显示出良好的经济社会效益。     

透明导电氧化物薄膜及其制备方法

综述了透明导电氧化物(TCO)薄膜的特性、应用及制备技术的发展,重点讨论了磁控溅射、脉冲激光沉积、溶胶-凝胶、喷射热分解等制备技术和柔性衬底TCO薄膜的制备状况、进展及发展趋势,并指出改进TCO薄膜制备技术的努力方向应体现完善薄膜性能、降低反应温度、提高控制精度、降低制备成本和适应集成化等趋势,而制备方法的选择则应根据薄膜的性能要求和不同的应用目的而不同.     

还原铜粉之注射成形

平均粒度约10μm的微细还原铜粉因不规则粉末形态及残留有较高的氧含量，而不易以注射成形工艺来制备高性能产品。本研究发现，采用具较多量之主干高分子为基础的多元粘结剂能克服不规则粉末形态所导致之严重粉末间之磨擦，而将这种微细还原铜粉顺利的注射成形。烧结时，若能在烧结孔洞封闭之前将粉末中的残留氧化物有效的予以还原，如在低于900℃之温度下给予适当保温，则注射成形组件之烧结密度可高达95％理论密度。在此条件下，注射成形组件的导电率可达纯铜导电率的80％以上。     

影响钛渣电炉炉体寿命的因素及延长措施探析

以国内外钛渣电炉生产实践为例，提出影响钛渣电炉炉体寿命的因素。从技术和经济的角度上，提出延长其使用寿命、降低造价成本的措施，并在某厂新建6300kVA钛渣电炉上实施，取得良好的生产效果。