【摘 要】
：
The earths surface irregularities can substantially affect seismic waves and induce amplifi cations of ground motions. This study investigates whether and how the source characteristics affect the sit
【出 处】
：
Earthquake Engineering and Engineering Vibration
论文部分内容阅读
The earths surface irregularities can substantially affect seismic waves and induce amplifi cations of ground motions. This study investigates whether and how the source characteristics affect the site amplifi cation effects. An analytical model of a
其他文献
A new off-axis integrated cavity output spectroscopy(ICOS) is coupled to Weiss equilibrator for continuous highresolution dissolved methane measurement in the surface ocean. The time constant for the
Both overgrazing and climate change contribute to grassland degradation in the alpine regions of China and negatively affect soil carbon and nitrogen pools. We quantified changes in soil organic carbo
Labile organic carbon(LOC) and carbon management index(CMI), which are sensitive factors to the changes of environment, can improve evaluating the effect of land management practices changes on soil q
Using conventional Mean Shift Algorithm to segment high spatial resolution Remote sensing images of mountainous areas usually leads to an unsatisfactory result, due to its rich texture information. In
Ada Boost算法作为Boosting算法的经典算法之一,在人脸检测和目标跟踪等领域得到了广泛应用,但该算法也有一个缺点——退化问题.为了解决这个问题,通过对弱分类器进行筛选、引入平滑因子和权值修正函数三个措施对算法进行优化,并将优化后的算法与小波包分解相结合应用到癫痫脑电信号的识别上.结果表明,本文算法对癫痫脑电信号的识别率为96.11%,对正常脑电信号的识别率为99.51%,具有较高的识别
For accuracy and rapidity of audio event detection in the mass-data audio processing tasks,a generic method of rapidly recognizing audio event based on 2D-Haar acoustic super feature vector and AdaBoo
为了研究植物叶片的外观特征,对叶缘的分离进行了研究.首先,通过对叶缘形状的观察,基于类比原则,应用凸集理论中的相关定理,研究发现某种类型对称叶片的叶缘所构成的平面点集中,任意两点的最大距离是叶尖点到叶基与叶柄交点的距离.以此为据,通过matlab编程,有效判别出杂交玉女兰,狗牙花,小叶榕,灰莉以及大红花等植物叶片的叶尖点以及叶基与叶柄的交点,从而实现对称叶片左右边界的分离.方法可以分离一般对称叶片
选用海滨锦葵自然群体为研究材料,以Na Cl溶液为盐胁迫,研究海滨锦葵在不同浓度盐胁迫下萌发期和幼苗期生长状况的变化,并筛选萌发期和幼苗期耐盐鉴定指标。结果表明,Na Cl胁迫下海滨锦葵种子发芽率、发芽势、发芽指数、下胚轴长、胚根长、鲜重、活力指数及幼苗株高均降低,并且各指标的盐害系数随着盐胁迫浓度的升高而升高。较低Na Cl浓度(0.5%~1.5%)胁迫下的幼苗地上干重和地上鲜重高于未用Na C
以乌兰布和沙漠东北缘的沙冬青为研究对象,利用LI-6400光合测定系统及其配备的荧光叶室测定研究不同水分状况下沙冬青热耗散和光化学、光呼吸等途径的光破坏防御特征。结果表明:沙冬青PSⅡ的最大光化学量子产量(Fv/Fm)、总光合速率(Pt)、光呼吸速率(Rp)、非光化学猝灭(NPQ)与水分饱和亏缺(x)的关系均可模拟为y=ae-bx^k,光呼吸速率/总光合速率(Rp/Pt)与水分饱和亏缺关系可模拟为
本文以研究缺铁条件下Mx IRT1蛋白膜泡在细胞中的外排途径机制为目的,采用基因芯片方法,发现在铁胁迫环境中,膜泡运输通路相关基因上调表达,推测Mx IRT1蛋白膜泡通过粗面内质网运送至高尔基体,然后通过内体再运送至质膜。该研究有助于进一步研究高等植物中Mx IRT1蛋白相关的铁转运机制。