乡村景观视角下传统村落现代营建监测数据库研究

面对中国传统村落保护的现实困境，拟解决在传统村落现代营建监管工作中,缺乏动态监测数据库平台的问题；通过建立乡村景观研究视角，进行传统村落的再认知；从实践出发，明确数据库构建的目标与原则；开展比对分析，确定空间数据库类型；构建“村域环境”监测内容；按照“人工景观”、“经营景观”、“自然景观”的景观分类，与“土地斑块”、“群体组合”、“单体要素”尺度层级，制定传统村落乡村景观的动态监测数据内容体系；最终完成传统村落现代营建动态监测数据库的设计。数据库可用于比对传统村落“新”、“老”乡村景观的特征，为传统村落现代营建的动态智能监管、档案资料存储、保护规划编制、乡村景观研究等工作，提供数字平台与虚拟模型。     

Laser stealth and laser protection properties of oxide-carbide coatings prepared by atmospheric plasma spraying

With the development of laser technology, laser-related materials have been widely studied. Both laser stealth coatings and laser protective coatings are currently the focus of attention. However, less research has been done on laser stealth and protective integrated coatings. In this paper, plasma-sprayed Y₂O₃–Ti₃AlC₂ coatings were prepared with low-power (LP) and high-power (HP) parameters, and their laser stealth and laser protection properties were characterized. The LP coating and HP coating appeared to have lower reflectivity at 1064 nm because a low-reflectivity second phase and many loose flocs on the surface are introduced, which indicates excellent laser stealth performance. When irradiated by a laser, the LP coating exhibited excellent laser protection ability, and its reflectivity increased after irradiation because Ti₃AlC₂ oxidized and decomposed and densely arranged small particles formed on the surface. The LP coating perfectly protected the 500-W laser irradiation for 20 s. In addition, the laser damage threshold of the LP coating was 5.599 s at 1000-W laser irradiation, which indicates that the LP Y₂O₃–Ti₃AlC₂ coating is a potential material with laser stealth and laser protection integration.     

基于节点1-邻居图相似性的社会网络匿名技术

利用传统的k匿名技术在社会网络中进行隐私保护时会存在聚类准则单一、图中数据信息利用不足等问题. 针对该问题, 提出了一种利用Kullback-Leibler (KL)散度衡量节点1-邻居图相似性的匿名技术(anonymization techniques for measuring the similarity of node 1-neighbor graph based on Kullback-Leibler divergence, SNKL). 根据节点1-邻居图分布的相似性对原始图节点集进行划分, 按照划分好的类进行图修改, 使修改后的图满足k匿名, 完成图的匿名发布. 实验结果表明, SNKL方法与HIGA方法相比在聚类系数上的改变量平均降低了17.3%, 同时生成的匿名图与原始图重要性节点重合度保持在95%以上. 所提方法在有效保证隐私的基础上, 可以显著的降低对原始图结构信息的改变.     

保护层一次钻爆技术在三峡工程的研究与应用

从孔间、孔内双微差起爆和孔底设置柔性垫层分析“梯段炮孔加柔性垫层”的作用成因；从水平预裂和梯段孔深的确定分析“梯段炮孔加水平预裂”的作用成因，并通过试验及爆前、爆后检测和检查，说明这两种保护层一次钻爆技术理论上是可行的，在实践上很适合大中型水电工程保护层开挖。     

Compatible performance of low thermal conductivity and high infrared radiation of Sm2O3-HfO2 series ceramics applied for thermal protection coatings

Sm₂O₃-HfO₂ series ceramics were synthesized at high temperature using the solid-state reaction. The phase stability, thermo-physical and infrared emission properties of Sm₂Hf₂O₇ (SHO) and Sm₂Hf₂O₇-44.83 wt%HfO₂ (25S/H) composite ceramics were comparatively investigated. Furthermore, their calcium magnesium aluminosilicate (CMAS) corrosion was conducted at 1250°C for different times. The results reveal that both SHO and 25S/H ceramics have excellent phase stability at 1600°C as well as excellent sintering resistance. SHO still exhibits slightly lower thermal conductivity and lower hardness and Young's modulus, higher thermal expansion coefficient (CTE) and fracture toughness as well as higher infrared emittance (0.899 at 800°C) than 25S/H composite with the excessive HfO₂ inside. Both SHO and 25S/H ceramics react with CMAS to form a relatively compact reaction layer, which can effectively prevent the penetration of CMAS. These results preliminarily indicate that SHO ceramic can be proposed as an alternative material of the traditional YSZ for high-temperature thermal protective applications thanks to its compatible performance of low thermal conductivity and high infrared radiation, etc.     

聚氨酯防水涂料的发展

聚氨酯涂料因其优异的防水性能,已广泛应用于建筑领域。介绍了我国聚氨酯防水涂料的现状。简单总结了聚氨酯防水涂料组成、分类和今后的发展趋势。     

深海电机密封罩表面耐蚀防护

为提高深海电机密封罩的耐蚀性,采用电镀方法在其表面镀覆掺杂耐蚀纳米微粒的增强镍基复合薄膜。制定了电镀方案,剖析了其中涵盖的工艺要点,并考察了经镀膜防护处理的密封罩在模拟海水环境中的耐蚀性。结果表明:镀膜密封罩表现出较优的抑蚀阻蚀性能,表面腐蚀程度轻微。     

粉煤灰-人工复合生态系统一体化处理酸性含铬废水的工艺研究

重金属铬对人类的影响不仅仅只是自身,还会影响以后的一代人甚至是几代人。文章在遵循以废治废及可持续发展的绿色环保理念的前提下,通过粉煤灰净水法与人工复合生态系统净水法的有机结合,使电镀铬废水达标排放。