推进剂复合加工控制系统

针对传统的工艺过程存在的精度低、质量差、安全程度低等弊端,设计某固定推进剂复合加工的自动化控制系统.分析推进剂加工的传统工艺过程,提出实现研究内容和设计要点,完成硬件平台框架的搭建,并在实际项目中得到了应用验证.验证结果表明:该系统实现了推进剂复合加工的自动化,具有设计周期短的优点.     

Large‐Area Flexible Core–Shell Graphene/Porous Carbon Woven Fabric Films for Fiber Supercapacitor Electrodes

New porous materials are of great importance in many technological applications. Here, the direct synthesis of multi‐layer graphene and porous carbon woven composite films by chemical vapor deposition on Ni gauze templates is reported. The composite films integrate the dual advantages of graphene and porous carbon, having not only the excellent electrical properties and flexibility of graphene but also the porous characteristics of amorphous carbon. The multi‐layer graphene/porous carbon woven fabric film creates a new platform for a variety of applications, such as fiber supercapacitors. The designed composite film has a capacitance of 20 μF/cm², which is close to the theoretical value and a device areal capacitance of 44 mF/cm².     

Sn-Zn-Bi-In-P新型无铅焊料性能研究

新型无铅焊料Sn-4.5Zn-2Bi-In-P、Sn-9Zn-2.5Bi-In-P具有优异的抗氧化、抗腐蚀性能,弥补了Sn-Zn系焊料润湿性能方面的不足,具有极大的实用性。测量了共晶Sn-9Zn、两种新型Sn-Zn系无铅焊料和传统的Sn-37Pb焊料的各项物理性能:密度、熔点、线膨胀系数、电阻率及对铜基体的润湿角。实验结果表明,新型Sn-Zn系无铅焊料的密度约为传统Sn-37Pb焊料的3/4;熔点(依次为194℃,191.9℃)接近Sn-37Pb焊料,熔程仅为8℃;在25~100℃,新型Sn-Zn焊料线膨胀系数依次为20.8×10–6/℃、16.9×10–6/℃,优于Sn-37Pb焊料(21.2×10–6/℃);新型Sn-Zn焊料的电阻率依次为1.73×10–6Ω·m、1.79×10–6Ω·m,优于Sn-37Pb焊料(1.96×10–6Ω·m);新型Sn-Zn焊料对Cu基体的润湿角接近30°,满足实用化的最低要求。     

基于ARM9平台的电子指南针的设计

针对指南针精度与显示界面的问题,在ARM9的开发平台上,设计了一款界面美观且能够实时显示方位、温度和时间的电子指南针。该系统采用了灵敏度和精度高的磁力传感器MAG3110检测方位,采用了智能型温度传感器DS18820检测温度,并选择了LinuxQt作为电子指南针图形界面的开发平台。实验结果表明,指南针方位精度达±2。,温度精度达±0．5℃,能够使用在普通导航领域上。     

High electric conduction property of composite copper-clad steelwire

The authors of this paper discover the high electric conduction property of the composite copper-clad steel wire; that is to say, in a specific frequency domain, its electric conduction property is higher than that of copper wire having the same diameter. This paper describes the relationship between this high conduction property as a function of the frequency and structure of the wire and points out that the property results from the reflection of an electromagnetic (EM) wave at the interface inside the composite wire     

低密度泡沫混凝土导热系数模型研究

针对干密度小于300kg/m^3的低密度泡沫混凝土进行干密度和导热系数测试,同时采用X射线计算机断层扫描成像(X-CT)技术对其气孔结构进行表征,并在此基础上利用二相体系材料导热系数模型对测试结果进行对比研究,提出了适用于低密度泡沫混凝土的新模型并进行验证.结果表明,该模型预测值与实测值具有显著相关性.     

超长复曲线及曲线性异形构件施工测量技术

国家会议中心工程结构形式复杂,立面造型曲面多变,圆柱和异形构件变化多样,使用常规测量手段难以满足精度要求。复曲线的施测通过解析出复曲线与轴线交点的坐标数据,利用全站仪放样功能测设出轴线交点的准确位置,再在两轴线间加密辅点,使之成为连续圆滑的曲线一系列的测量方法来完成。     

某矿留窄煤柱沿空掘巷下采空区自燃防治灭火技术研究

以某矿8800工作面为研究背景,为了解决其由于煤层地质构造复杂,不能持续回采,在停采期间回风隅角处CO浓度增高,进、回风巷温度升高,容易出现煤自燃发火的隐患,在采空区采用了预埋管灌注三相泡沫和开放式注氮的防火技术。经过实际应用后发现,采空区温度、CO等指标性气体的浓度呈连续下降趋势,并在较长的时间内保持稳定。故采用此方法能够有效地抑制留窄煤柱沿空掘巷采空区内的自燃趋势.