印刷电路板缺陷检测的实际应用

电路板在我们的日常生活中非常常见,这就使得印刷电路板的缺陷检测显得尤为重要。AOI作为新兴的检测PCB板缺陷的系统,在生产实际中正在被大家熟知并且应用。相较于传统的检测方式,AOI系统比较灵活,无论是在检测时间还是系统运算上,或者是对相关技术人员的要求相较于传统方式都比较有优势,本文就AOI系统在实际中的应用展开讨论,分析并且介绍了在实际应用中的具体细则。     

In-situ repair of composite palladium membranes with macro defects: A case study

A new method was developed for repairing Pd/Al₂O₃ membranes with macro defects without the need of disassembling the membrane from the module. In order to target and fill the membrane defect automatically with solid particles, a TiO₂ powder was firstly tested by flowing high-pressure nitrogen as a carrier gas, followed by a heat treatment. A filter cake was found on the membrane defect but still porous. A glass powder was selected instead of TiO₂, and the membrane defect was successfully sealed by glazing. The in-situ repair of a waste commercial Pd/Al₂O₃ membrane separator was carried out with the glass powder, and the hydrogen flux and H₂/N₂ selectivity of the membrane separator at 450 °C under 100 kPa reached 12.6 m³m⁻²h⁻¹ and 1600, respectively.     

Realizing enhanced thermoelectric properties in Cu2GeSe3 via a synergistic effect of In and Ag dual-doping

In this work, we propose a modulation doping strategy for simultaneous achievement of low lattice thermal conductivity and high Seebeck coefficient in the Cu₂GeSe₃ compound. The Ag and In dual-doping can optimize the hole carrier concentration to balance electrical conductivity and Seebeck coefficient, achieving a high power factor of ～6.4 μW cm^?1 K^?2 for the Cu₂GeSe₃ compound. The Ag point defect makes a great contribution to blocking the propagation of phonons besides the phonon-phonon Umklapp process, yielding a minimum lattice thermal conductivity of ～0.38 W m^–1 K^–1. Remarkably, a maximum ZT value of ～0.97 at 723 K is achieved for Cu_1.8Ag_0.2Ge_0.95In_0.05Se₃ compound, which is the highest value for the Cu₂GeSe₃-based systems in the temperature range of 323–723 K.     

用锤击贯入法判定桩身缺陷的尝试

本文讨论了在锤击过程中．贯入度性状与桩身缺陷的相关关系．并对桩身缺陷产生的原因进行简要的讨论。     

Intensification of Polymetallic Sulfide Ore Dressing by High-Energy Electrons

It is established that accumulation of radiation defects and radiation-induced electric breakdown decrease the mechanical strength of ores and facilitate the fracture over the interface of different minerals. The preliminary processing by electron beam increases the quality of flotation concentrate.     

基桩低应变动测首波振幅特征分析

本通过对基桩桩身浅部缺陷与低应变动到应力波首波振幅特征关系进行分析，就目前检测系统中使用的自动增益控制(Agc)和浮点放大技术导致的缺陷漏判问题提出了改进意见。     

含裂纹型缺陷压力容器用钢失效评定曲线研究

在力学性能测试的基础上．应用CEGB R6-Revison 4方法中的选择1和选择3曲线，对16MnR，20R和Q235B三种吉裂纹型缺陷压力容器用钢的失效评定曲线进行研究。结果表明．三种材料的失效评定曲线基本上均在Lr〈0.4后因试样结构不同而发生分散。而且均以是以Lr=0.7为分界线，在两侧分别出现不同的最为保守和最不保守曲线。给出了符合三种材料特性的失效评定曲线拟合方程，以便为工程应用提供依据。     

晶体硅中缺陷和沉淀的红外扫描仪研究

晶体硅中的杂质或缺陷会显著地影响各种硅基器件的性能.通过红外扫描仪观察晶体硅中的晶界、位错和不同金属沉淀的分布和形貌,并分析其相关信息.与传统研究手段相比,红外扫描仪不仅可以直接观察到体内的缺陷或沉淀,而且不会破坏样品.     

热轧带钢表面质量检测系统的工程设计与实践

由于受工艺条件、生产环境的制约,热轧带钢表面缺陷识别一直是困扰生产厂提高产品质量和生产率,减少用户质量异议的瓶颈问题.文章介绍了热轧带钢表面质量检测系统的原理与构成,并介绍了宝钢热轧厂两条生产线的带钢表面质量检测装置及其配套设施的工程设计.     

三峡永久船闸工程混凝土缺陷治理

针对三峡永久船闸工程混凝土缺陷的类型，介绍了缺陷治理选用的材料，并对灌浆工艺、施工注意要点、灌浆质量检验作了详细介绍。