堇青石基玻璃陶瓷的制备与展望

介绍了制备堇青石基玻璃陶瓷的三种方法：熔融法、烧结法和溶胶-凝胶法，综述了玻璃组成、添加剂和成核剂对堇青石基玻璃陶瓷的烧结及性能的影响，并对其未来的发展进行了展望。     

先进的模具加工设备与技术简介

介绍某厂近期引进的三套先进的模具加工、检测装备与技术：模具喷砂清理机，模具三维检测仪,模具加工中心.     

基于背景先验与中心先验的显著性目标检测北大核心CSCD

针对传统的图流行排序显著性目标检测算法存在先验信息单一,显著目标检测不完整的问题,提出一种新的基于背景先验与中心先验的显著性目标检测算法。首先将图像边界节点作为背景种子进行流行排序获得粗略的前景区域,将其再次流行排序得到初步显著图;然后利用Harris角点检测、聚类实现中心先验显著性检测,捕获中心显著信息;最后在初步显著图上融合图像中心显著性,得到最终显著图。本文对综合指标、精确率-召回率曲线、F-measure值以及平均绝对误差(mean absolute error,MAE)值进行实验评估,在公开数据集MSRA-10K和ECSSD上进行的实验结果表明:对比10种主流算法,本文算法在不同的评估指标上都具有较好的表现,且能准确地突出显著目标,提升背景抑制效果。     

多指示剂复合pH敏感膜及其试验

采用多指示剂聚合构成 pH敏感膜 ,并用神经网络进行光谱处理 ,能有效扩大 pH的敏感范围 ,克服目前光纤化学 pH传感器量程小的缺陷 ,有助于该类传感器的实用化。     

在程序中选择和配置输入法

介绍了在VC＋＋开发的Windows应用程序中选择和配置输入法的技术,为基于Windows95／98平台的无纸化考试系统操纵和控制输入法提供了一种行之有效的解决办法。     

一种新的体数据层次模型构造方法

分析了体数据小波变换的空间－频域特征,提出了一种构造体数据层次模型的新方法。新方法将小波变换的结果重组为有效位置体,并采用基于系数尺度立方体的细化规则,通过自上而下逐尺度加入高频细节的策略来构造体数据的层次模型。与现有方法不同,新方法直接根据小波系数来判定体数据局部区域的复杂度,避免了费时的小波逆变换,简化了模型的构造,节省了时间。实验证明,新方法性能良好,简单易行,适合对大容量规则数据集进行交互     

电站直热锅炉均匀流量控制适应式模糊数学优化方法

电站直热锅炉燃烧系统要求三管流量均匀控制。在分析偏流成因的基础上，提出了以三管出口温差为输入，词节阀开度为控制量的模糊控制方案。解决了燃烧过程中的加热管结焦问题。加热管使用寿命提高三倍以上。实际运行表明该方案是合理和有效的。     

Microstructure evolution and interfacial bonding mechanisms of ultrasonically soldered sapphire/Al dissimilar joints using Sn-based solders

Sapphire and 5A06 Al were ultrasonically soldered with Sn9Zn, SAC305 alloy solders and NiCu alloy foam added Sn-based composite solders, respectively. The microstructure and mechanical properties of joints were investigated and the interfacial bonding mechanism was analyzed. Cracks were observed at the sapphire/Sn matrix interface in joints soldered with alloy solders, which were disappeared in the joints soldered with composite solders. In the joint using NiCu–Sn9Zn composite solder, the solder seam was uneven and Al₃Ni intermetallic compound (IMC) layer was formed on the surface of NiCu alloy skeletons. While in the joint using NiCu-SAC305 composite solder, fine particles of (Ni,Zn)₃Sn₄ were largely formed and homogeneously distributed in the solder seam. An amorphous Al₂O₃ transition layer was formed at the sapphire/Sn matrix interface, and Zn enrichment was found at the Sn matrix/amorphous Al₂O₃ interface. The action mechanism of Zn was analyzed by first-principles calculation. The joints soldered with NiCu-SAC305 composite solder exhibited the highest shear strength of 74.42 MPa, the shearing failure mainly happened in the soldering seam.     

Antoni Gaudí and Frei Otto: Essential Precursors to the Parametricism Manifesto

As Senior Architect to the Basilica of the Sagrada Família in Barcelona, Mark Burry has been ‘thinking parametrically’ for almost his entire career. Here he describes how his longstanding role overseeing the completion of Antoni Gaudí's masterpiece has afforded unique insights into the work of a great geometer and parametric thinker. Burry places the contribution of Gaudí alongside that of Frei Otto – the other eminent 20th-century Proto-Parametricist.     

New Hearts for Two Gulf Cities

Doha in Qatar and Sharjah in the UAE are both currently looking to their own heritage for inspiration in the redevelopment of their urban cores or hearts. Varkki Pallathucheril , an expert in urban planning and Professor at the College of Architecture, Art and Design at the American University of Sharjah (AUS), considers the impact challenges of this type of development.