26 research outputs found

    Eco-treatment Engineering of Sewage Forest Land in Xiamen

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    文章介绍了厦门市狐尾山原生生活污水林地生态处理工程依循“污水-土壤-植物”资源再生机制,提出了“截流井+氧化塘(调节池)+污水动力输送、管网投配+林地+城市景观林地”的基本模式

    Conceiving the United Management System of the Sea Area Environment Around Xiamen and Jinmen Islands

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    分析两地海洋环境管理体系互补、互动关系 ,提出优化管理资源配置 ,构建一个两地协调的海洋环境管理体系的设想 ,从体制上解决分割的管理体系与统一的管理目标—金厦海域管理的矛盾The paper analyses the complementary and inderdynamic relations of ocean environmental management system between Xiamen and Jinmen,and then puts forward the conceive of optimizing management resource configuration and constructing the United Management System of the sea area around Xiament and Jinment Islands to resolve the contradictory between the management goal and the management systems

    利用DZ原料研制高温窑具涂料

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    利用锆英石经等离子处理而得的DZ原料,研制出一种由ZrO_2、SiO_2和莫来石晶体组成的DZ涂料,用作窑具的保护层。由于这种涂料具有高温晶相稳定,导热系数较大,热膨胀系数较小,抗热震性强等优点,对提高窑具的使用寿命取得了显著的效果

    基于光外差技术的超宽带频率响应测量系统

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    介绍了一种利用光外差技术测量光电探测器超宽带频率响应的测试方法。将一个可调谐外腔激光器和一个固定波长的分布反馈激光器(DFB-LD’s)产生的激光输入到光电探测器进行混频。通过对可调激光器腔长的控制,可以在光电探测器产生从DC到上百GHz的拍频信号,在无需额外校准光源的情况下就可以进行光电探测器超宽带频率响应特性的测试,这是该方法最突出的优点。实验证明该方法比较准确、简便、易于操作。在实验中,对两个不同的InGaAs p-i—n探测器进行测量,得到器件的3dB带宽分别为14.4GHz和40GHz。该测量方法对同类实验的研究和应用都具有实用意义

    A new method for low-temperature direct wafer bonding of InP/GaAs

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    通过对 InP/GaAs 异质键合实验方法的研究,提出了包括表面活化处理、真空预键合和退火热处理的三步法,在350℃低温下实现了InP/GaAs异质材料的键合。界面电流 电压(I V)特性的研究表明,350℃样品的界面过渡层极薄,电子主要以隧穿方式通过界面,而450℃的扩散使得过渡层增厚,界面电流 电压特性可视为双肖特基二极管的反向串联。同时,对键合样品也进行了拉力测试,实验结果表明 450℃样品的键合强度优于350℃样品。最后,对InP/GaAs异质材料的键合机理进行了探讨。Based on the research of the direct wafer bonding of InP/GaAs, we proposed a novel method, which includes surface preparation, prebonding in vacuum and an elevated temperature anneal, and bonded InP/GaAs successfully at low-temperature (350℃). Through the study of current versus voltage (I-V) character, we found the interlayer between GaAs and InP was so thin that the carrier can tunnel across the heterobarrier bonded at 350℃. But the interlayer became thick when the annealing temperature reached 450℃, and the I-V character can be seen as the reverse tandem of two schottky diode. Bonded interfaces were also characterized by tensile-strength measurement and revealed that the bonding strength at 450℃ was stronger than that of 350℃. Finally, we discussed the mechanism of InP/GaAs meterials.国家自然科学基金资助项目(60006004

    The Spatial Distribution of Breeding Ardeidae in Dayu Island, Xiamen Egret Natural Reserve

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    采用样方法 ,根据生态学原理 ,分析厦门白鹭自然保护区大屿岛鹭类繁殖的空间分布规律 .结果表明 :鹭类在大屿岛繁殖时 ,具有明显的水平分布特征 .夜鹭 (N ycticorax nycticorax)主要分布于核心区中部偏南的中央大片区域 ;白鹭 (Egretta garzetta)各处都能分布 ;池鹭 (Aroleola bacchus)仅分布于核心区的南北 ;牛背鹭 (Bubulcus ibis)和黄嘴白鹭 (Egretta eulophotes)只分布在核心区中部偏北的局部区域 ,和白鹭、夜鹭共栖一处 .鹭类在大屿岛上的繁殖也具明显的垂直分布现象 .夜鹭巢位最高 ,白鹭、牛背鹭和黄嘴白鹭的巢居中 ,而且三者巢位相近 ;在白鹭和池鹭营巢在同一树上的情况下 ,池鹭的巢处于上层 .对鹭类集群繁殖时的空间分布现象的产生原因也进行了探讨With sampling method and ecological theory, the spatial distribution of Ardeidae in Dayu Island, Xiamen Egret Natural Reserve were investigated and discussed. The results show that there is a horizontal distribution in colonial breeding Ardeidae. Nycticerax nycticorax mainly distribute on southern region in the center of the core area; Egretta garzetta breed in all regions of the core area; Ardeola bacchus only locate their nests on both northern and southern sides of the core area; Bubulcus ibis and Egretta eulophotes place their nests on the North of the core area, sharing the place with Egretta garzetta and Aroleola bacchus . During breeding period, the vertical distributions also appear. Nycticorax nycticorax locate their nests on the tiptop of the forest; the nests of Egretta garzetta, Bubulcus ibis and Egretta eulophotes are in the middle. When Egretta garzetta and Aroleola bacchus nest on the same tree, the latter usually nest in higher place.福建省自然科学基金资助项目 (D9910 0 0 3

    半导体激光器同轴封装的高频影响:分析与实验

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    存高频调制下,封装对半导体激光器的影响非常显著。通过分析封装前后激光器散射参量之间的火系,推导出可用于分析半导体激光器封装高频影响的两种方

    工程堆积体坡面砾石分布及含量概化

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    &nbsp; &nbsp; &nbsp; &nbsp; 为室内试验中更好地模拟工程堆积体,利用图像分析法和经典统计学方法对六大典型水蚀区的368座工程堆积体中粒径D>1 cm的坡面砾石的分布和含量进行概化分析,得到工程堆积体下垫面上中下坡位砾石含量的概化区间。结果表明:工程堆积体坡面各粒径砾石含量大多服从正态分布,且山区和平原丘陵区之间的砾石总含量有显著性差异。工程堆积体坡面砾石重力分选作用明显,且随着砾石粒径的增加,分选程度增大。在室内进行工程堆积体下垫面设计时,山区堆积体的砾石总含量宜设置在50%~60%之间,其中,细粒砾石含量宜设置在20%~30%之间,中粒砾石含量宜设置在10%~15%之间,粗粒砾石和巨粒砾石含量宜设置为10%,堆积体上中下坡位坡面砾石含量配比宜设置为1∶1.3∶1.5;平原丘陵区的砾石总含量宜设置在15%~20%之间,其中细粒砾石、中粒砾石、粗粒砾石、巨粒砾石含量分别宜设置在5%~10%、3%~7%、2%~5%、2%~3%之间,堆积体上中下坡位坡面砾石含量配比宜设置为1∶1.5∶2.5。</p

    利用腐植酸制备高比表面钙系脱硫剂的研究

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    采用煤炭腐植酸(HA)作为添加剂获得了较高比表面(高于50m2/g)的碳酸钙产品,利用SEM方法观测了HA的引入对碳酸钙粒子形貌的影响,采用BET方法测量了所得碳酸钙粉体的比表面积和孔分布情况,XRD分析指出所得产品的结晶度下降,内部缺陷增多,脱硫实验指出所得产品的脱硫性能较普通碳酸钙明显提高
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