玻璃纤维布加固的钢筋混凝土梁试验研究与抗弯承载力计算

对9根玻璃纤维布加固的钢筋混凝土梁和3根对比梁进行了抗弯性能试验研究. 试验中考虑了配筋率、加固量、剪跨比与混凝土强度等级4个参数. 试验结果表明, 经玻璃纤维布加固的钢筋混凝土梁抗弯承载力有显著提高; 混凝土强度、配筋率、加固量对极限荷载有显著影响; 剪跨比对加固梁的破坏形态有影响. 根据不同的破坏模式, 提出了抗弯承载力计算方法.     

Nd3+-Yb3+-Ho3+掺杂四氟化锆玻璃的Ho3+上转换特性研究

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｉｎｒｅｃｅｎｔｙｅａｒｓ ,ｈｉｇｈ ｐｏｗｅｒｌａｓｅｒｄｉｏｄｅｓｈａｖｅｂｅｅｎｅｍｐｌｏｙｅｄａｓｐｕｍｐｉｎｇｓｏｕｒｃｅｓｗｉｔｈａｖｉｅｗｔｏｄｅｖｅｌｏｐｃｏｍｐａｃｔｕｐ ｃｏｎｖｅｒｓｉｏｎｖｉｓｉｂｌｅ ｌａｓｅｒｓｙｓｔｅｍｓ .Ｔｈｅｆｒｅ ｑｕｅｎｃｙｃｏｎｖｅｒｓｉｏｎｏｆｉｎｆｒａｒｅｄｌｉｇｈｔｔｏｖｉｓｉｂｌｅｌｉｇｈｔｈａｓｂｅｅｎｅｘｔｅｎｓｉｖｅｌｙｉｎｖｅｓｔｉｇａｔｅｄｆｏｒｒａｒｅ ｅａｒｔｈｄｏｐｅｄｃｒｙｓｔａｌｓａｎｄｇ…     

等温时效过程中金属玻璃的结构弛豫

本文针对目前对于金属玻璃结构弛豫规律的不同看法,结合a—Pd_(8o)Si_(20)的等温内耗测量,通过分析、研究提出了我们的看法。同时,提出了金属玻璃在等温时效过程中结构弛豫的非线性动力学特征,并导出了金属玻璃在等温时效过程中内耗随时间变化的半经验公式。     

新型场发射器件中栅极的化学刻蚀制备

为了得到碳纳米管场发射器件的三极结构,设计了一种新型栅极.在电极的制作过程中使用普通的丝网印刷方法,然后运用化学刻蚀的手段进行双面刻蚀制备出带有小孔阵列的栅极.在栅极制作过程中通过改变酸液刻蚀的时间和浓度,可以腐蚀出不同形状的小孔.运用扫描电镜(SEM)和红外光谱(IR)分析,得到小孔的尺寸、形貌和刻蚀液的成份,然后在三极结构上加电压显示出孔的亮度图像,最后对器件结构进行模拟,算出在电场条件下的电子从阴极拉到阳极基板的轨迹.模拟结果和实验结果一致,从而实现了对场发射三极器件的优化.     

高铝质多孔陶瓷的研制及多孔衬底的制备

本课题是研究高铝质多孔陶瓷的制备工艺 ,并在此基础上研制多孔衬底的制备工艺。一方面 ,以铝矾土为骨料 ,以粘土为结合剂 ,采用泥浆浇注法研制陶瓷管 ;另一方面 ,以α-Al2 O3粉料挤压成型研制出多孔陶瓷片。     

BaTi1-x—yNbxMnyO3半导体陶瓷PTC效应的研究

采用固相法制备了施主杂质Nb和受主杂质Mn共掺的BaTiO3基半导体复合陶瓷．通过对比实验结果，详细地分析了施主杂质和受主杂质的参杂效应对于BaTiO3基PTC陶瓷的室温电阻率和升阻比的影响，得到了充分利用BaTiO3基半导体复合陶瓷PTC效应较为理想的掺杂浓度范围．同时，比较Heywan与Ihring模型对于PTC效应的不同解释，根据原子价控理论和铁电效应补偿理论措一步分析了PTC效应的微观机制．较为完备地解释了PTC效应．     

外墙薄抹灰聚苯板保温技术

聚苯乙烯保温板（EPS）外墙外保温等节能施工技术具有较好的保温节能效果。对包括基层处理、保温板安装及固定、粘贴玻纤网、涂抹面胶浆等工艺的聚苯板外墙外保温施工过程进行了详细说明,交待了安全措施以及施工难题。指出材料是基础,施工是关键。     

环境陶艺与校园景观研究

以武夷学院(筹)为例通过论述“陶艺”在现代环境设计中的新思路,借助学校的“传承文化”本质平台,用“陶”的语言体现学校文化内涵。     

防火玻璃窗启闭机构设计

根据机构动作分解与组合原理提出了一种防火玻璃窗启闭机构设计的设计方法,并运用优化综合的方法给予了定量分析,得到了满意解.     

Technical replicas of Portuguese ceramic tile bodies produced in the Oporto region in the late nineteenth to early twentieth centuries

Portugal is well known for its facades decorated entirely with ornamented glazed ceramic wall tiles called azulejos. On ageing, the tiles may detach and fall off, or deteriorate to such an extent that it becomes necessary to replicate them. Hence tile replication is a common practice in Portugal for façade restoration, but very often these new tiles do not have the same physical and/or chemical properties as the original ones. Such differences might be a factor in differential deterioration of the façades after restoration. One step toward an improvement in compatibility is to make new ceramic bodies with the same characteristics as the original ones. This study focuses on two types of glazed ceramic wall tiles from the Oporto region in Portugal: ‘calcic faience’ and pó de pedra. A total of 25 samples from the late nineteenth to early twentieth centuries were studied systematically as an attempt to improve knowledge of these materials and to create a basis for their replication. All samples were collected from facades that were under conservation/restoration at the time when sampling was performed. The original traditional ceramic bodies were analyzed by X-ray diffraction and X-ray fluorescence. Total open porosity, capillary absorption coefficient, and mercury intrusion porosimetry were also measured in order to gain knowledge on their physical characteristics in addition to their chemical and mineralogical compositions. High-temperature crystalline phases such as diopside, gehlenite, and mullite were found in the calcic faience, suggesting that the firing temperature of calcic faience bodies was within the range of 1100–1150?°C. Calcination trials were also performed in order to determine the most probable firing temperatures of the ceramic bodies. Collected data led to the assumption that the raw materials used for the ceramic bodies were kaolinitic clay, quartz sand, limestone, and talc. The raw materials for pó de pedra tiles were found to include kaolinite clay and quartz with firing temperatures estimated within the temperature range of 1150–1360?°C. Technical replicas made on the basis of these investigations were found to have the same mineralogical and capillary properties as the original tiles.