25 resultados para Easter 1916

em Chinese Academy of Sciences Institutional Repositories Grid Portal


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在分析地震对尾矿坝造成破坏特点的基础上,介绍了尾矿坝地震稳定性分析方法。以龙都尾矿库细粒尾矿堆积坝为例,分析了在当地发生七级地震情况下,尾矿坝在不同状态下的结果,为矿山进行尾矿库的安全管理提供了科学依据。

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国家自然科学基金项目(30730032)

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提出了菲涅耳联合变换相关器(Fresnel Joint Trans form Correlator,FnJTC)结构,给出了数学推导过程,并通过计算机模拟验证了可行性及其与传统相关器所不同的相关特性。在相关过程第一阶段中,菲涅耳联合变换相关器对输入的联合图像作菲涅耳变换,代替了传统联合变换相关器(JTC)的傅里叶变换。与传统相关器相比,菲涅耳联合变换相关器是空变系统,相关峰值依赖于输入参考图像与目标图像的相似性、两图像之间的相对位置及参考图像(或目标图像)的线性相位调制。

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对采自于中国洞庭湖和汉阳墨水湖氧化沟的5种吸管虫做了形态学报道,均为国内新纪录:靴状盘吸管虫Discophryacothurnata(Weisse,1847-1848)Lachmann,1859;粗壮盘吸管虫DiscophryarobustaNozawa,1938;长柄球吸管虫Metacinetamacrocaulis(Stokes,1887)Matthes,1954;圆形放射吸管虫Heliophryarotunda(Hentschel,1916)Matthes,1954和孟加拉锤吸管虫Tokophrya

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介绍第一篇由中国作者正式发表的研究中国淡水藻类的论文及其作者。1916年,胡烈(即我国著名昆虫学家胡经甫)在上海博物学会编辑、上海文明书局出版发行的《博物学杂志》上发表了《藻类之研究》一文。对其学术价值和在中国藻类学上的意义进行评价。

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<正> 1914—1916年H.Handel-Mazzetti曾在云南的滇南、滇中、滇西北及四川的川西南广大地区采集了许多植物标本。其中藻类标本有92号,经H.Skuja于1937年进行分类研究后,首次发表了该地区的藻类,但中心纲硅藻仅有8种、4变种,隶属于4属、1科,1目。

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<正> 早在1878年就有关于有毒蓝藻使动物中毒的报道。廿世纪以来,产毒藻类引起人、畜中毒的事件在世界许多国家和地区均有发生。如1916年,在美国佛罗里达西海岸,许多人曾因甲藻中毒而出现呼吸系统的病状;由于供水系统中的藻类毒素引起人们消化道疾病的事例为数不少,Lippy和Erb 1976年报道的一起肠道疾病的暴发流行即是与水库中的一种丝状蓝藻——裂须藻的大量生长有关,毒性藻华造成鱼类和其它动物中毒和死亡,在经济上带来损失的事例不胜枚举。仅美国Storm湖因水华鱼腥藻毒性藻华使大量禽类及松鼠、狗、猫等动物中

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Hybrid bulk heterojunction solar cells based on blend of poly(3-hexylthiophene) (P3HT) and TiO2 nanotubes or dye(N719) modified TiO2 nanotubes were processed from solution and characterized to research the nature of organic/inorganic hybrid materials. Compared with the pristine polymer P3HT and TiO2 nanoparticles/P3HT solar cells, the TiO2 nanotubes/P3HT hybrid solar cells show obvious performance improvement, due to the formation of the bulk heterojunction and charge transport improvement. A further improvement in the device performance can be achieved by modifying TiO2 nanotube surface with a standard dye N719 which can play a role in the improvement of both the light absorption and charge dissociation. Compared with the non-modified TiO2 nanotubes solar cells, the modified ones have better power conversion efficiency under 100 mW/cm(2) illumination with 500W Xenon lamp. (C) 2008 Elsevier B. V. All rights reserved.

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弹性CA是一种使用入侵容忍技术保护CA密钥的CA系统,它采用了新的私钥分割方法加强了系统的安全性,但其使用的密钥分发中心却不利于CA私钥安全.分布式密钥产生方案就是在传统的弹性CA方案的基础上取消了密钥分发中心,使用分布式的密钥产生和分割机制,从而保证了在CA初始化和整个运行过程中,任意t-1(t为门限值)台服务器都不可能窃得CA私钥,大大加强了CA系统安全.

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Hydrate equilibrium data of the CH4 + tetra-n-butyl ammonium bromide (TBAB) + water have been measured by using the isothermal pressure search method for four components of TBAB aqueous solutions. The three-phase equilibrium lines obtained in the present study are shifted to the low-temperature or high-pressure side from that of the stoichiometric TBAB solution. Moreover, methane uptake into semi-clathrates is confirmed by a shift in the clathrate regions when methane is present. The experiments are carried out in the pressure range of (0.5 to 11) MPa and in the temperature range of (281.15 to 295.15) K.

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该文提出了一种用于抑制椒盐噪声的多窗口中值滤波算法。算法在招待过程中根据具体情况采用不同大小的滤波窗口。仿真结果表明,与标准中值滤波算法相比,该方法不仅可以有效去除图像中的椒盐噪声,特别是在噪声密度非常大的情况下,表现了很好的性。

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This paper introduced a long-term ambulatory intragastric pH monitoring system, which is designed for prolonged ambulatory studies of Gastroesophageal Reflux Diseases. The whole system is composed of the gastric catheter with two pH sensors, a small data logger (Microdatalog), and a notebook PC. In this paper, the design of monitoring system hardware and software are described in detail. Clinical applications reveal good results.