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Search Results: 1 - 10 of 94657 matches for " 任嘉伟 "
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云南景谷MS6.6地震地震动特征分析
Ground Motion Characteristics of the Jinggu MS6.6 Earthquake in Yunnan

,冀昆,温瑞智,叶飞
- , 2015, DOI: 10.3969/j.issn.1000-0844.2015.04.0969
Abstract: 2014年8月3日云南省鲁甸发生MS6.5地震后,10月7日云南省内再次发生景谷MS6.6地震。对我国数字强震台网捕获的39组主震记录进行处理后,分析幅值参数、Arias强度以及持时参数的衰减特征,发现两次地震触发台站远场记录的地震动参数均显著低于预测方程,鲁甸地震的近场地震动参数略高于景谷地震;而鲁甸地震地震动参数衰减快于景谷地震,这可能与云南东部地区Q值低于西部地区的区域差异性特征相关。分析结果可以为研究该区域6.5级左右地震动衰减特征提供参考。
The Jinggu MS6.6 earthquake that occurred on October 7, 2014 was another shallow earthquake following the Ludian MS6.5 earthquake that occurred on August 3, 2014 in Yunnan. During the main shock, 39 recordings were obtained by the National Strong Motion Observation Network System of China. Within an area above intensity Ⅵ, only five stations were triggered by the earthquake. In this study, we calculated the peak ground acceleration(PGA) and peak ground velocity(PGV) from these recordings. The PGA and spectral acceleration of site 053JYP, which captured the maximum PGA(543 gal), were significantly higher than the design specifications of a local area. A field survey around this station confirmed that structures were seriously damaged during the main shock. The site and topography effects may be explained by significant differences between the PGAs of sites 053JYZ and 053JGX. We then compared the attenuation characteristics of the PGA, PGV, spectral acceleration, Arias intensity, and significant duration of the Jinggu and Ludian earthquakes. In a near-field area, all observed values of these earthquakes were significantly higher than predicted values but were lower than those predicted in far-field areas. Except for the significant duration, all strong motion parameters from the Ludian earthquake were slightly higher than those of the Jinggu earthquake. We also found most far-field observed values to be lower than those predicted for these two earthquakes. The difference in Q values in different regions of Yunnan may be the main reason for this phenomenon.
关于治理巢湖水污染的现状采取生态修复的物理方法
The Physical Method of Ecological Restoration on the Current Situation of Water Pollution in Chaohu
 [PDF]

, , 中成
Water pollution and treatment (WPT) , 2016, DOI: 10.12677/WPT.2016.44020
Abstract:
通过在安徽省巢湖市的调研,以水环境治理为切入点调研该地的水污染现状以及采取生态修复的物理方法,深入挖掘这个城市的水环境现状,并总结、提出自己的思考,从而探索“水生态文明城市”的建设情况。巢湖近期开展国开行项目,以疏浚底泥为主要方向。巢湖历史悠久、人杰地灵,有着得天独厚的水环境条件、漫长悠久的水文化历史。通过分析巢湖流域水污染现状及形成原因,借鉴目前国内外治理湖泊污染的经验方法,提出通过人工湿地、生态沟渠,人工清於等一系列的生态治理措施,从巢湖外源及内源方面综合来改善巢湖水环境。
Through the investigation in Chaohu city of Anhui Province, starting from water environment treatment, the local water pollution status has been researched. Physical methods of ecological restoration were adopted to deeply explore the city water environment situation. Then we summed up and put forward our own thinking, to explore the construction situation of “water ecological civilization city”. A project of CDB dredging has been launched recently in Chaohu city, with dredging sludge as the main direction. Chaohu has a long history, with outstanding people, which owns the advantaged water environment conditions and long water culture history. By analyzing the water pollution status and its causes in Chaohu basin, and drawing lessons from the experiences and methods for treating lake pollution at home and abroad, a series of ecological management measures have been proposed, such as constructed wetlands, ecological ditch, dredging by humans, etc., which can improve the water environment of Chaohu in exogenous and endogenous sources synthetically.
基于混合I型删失数据威布尔模型的可接受抽样计划
Acceptance Sampling Plans with Type-I Hybrid Censoring Scheme of Weibull Distribution
 [PDF]


Advances in Applied Mathematics (AAM) , 2014, DOI: 10.12677/AAM.2014.34027
Abstract:
寿命是产品质量的一个重要指标。根据产品的寿命指标,用于确定产品的接受程度的可靠性试验,被称为可接受抽样计划。本文研究了基于混合I型删失数据的威布尔模型可接受抽样计划。首先,我们给出了威布尔分布尺度参数最大似然估计的精确分布。进而根据枢轴量的精确分布,在消费者与生产者风险可控的条件下,我们给出了可接受抽样计划的执行方法。最后为了展示本文的方法,我们给出了一些可接受抽样计划的数值模拟结果。
Lifetime is an important quality variable of a product. Sampling plans used to determine the ac-ceptability of a product, with respect to its lifetime, are known as acceptance sampling plans. In this paper, we discuss acceptance sampling plans of Weibull distribution with considering the Type-I hybrid censoring schemes. Firstly, we give the exact conditional distribution of the maximum likelihood estimator (MLE) of the scale parameter. Secondly, using the exact distribution of a pivotal quantity, we establish an acceptance sampling procedure satisfying the producer and consumer risks. Finally, some numerical results are tabulated for illustration.
BOC信号解模糊通用模型的构建与应用
陈辉华,,贾维敏,姚敏立
电子学报 , 2013, DOI: 10.3969/j.issn.0372-2112.2013.01.001
Abstract: 针对现有边峰消除方法缺乏理论分析模型的问题,提出了一种新的边峰消除理论分析通用模型,将现有的各种基于相关函数组合的二进制偏移载波(BOC)信号无模糊处理方法统一起来,同时为算法的设计提供了有力的数学工具.该模型通过建立泛化的扩频符号波形,构建接收BOC信号与本地辅助信号的互相关函数.基于现有方法对该模型进行了数学证明.并在此模型的基础上提出了一种新的基于合成相关函数的BOC信号无模糊跟踪方法.理论分析与仿真结果表明,新的无模糊跟踪方法能够在保持BOC自相关函数主峰宽度的前提下,完全消除其边峰,实现无模糊跟踪,同时该方法具有较好的多径抑制能力.
水苏糖对乳制品中微生物的影响
舒国,,宏强,杨建武
食品科学 , 2005,
Abstract: ?研究了水苏糖对消毒乳、奶粉及酸奶中微生物的影响,结果表明:在消毒乳中添加水苏糖≤1%时,对消毒乳的微生物学指标无明显影响;在奶粉中添加水苏糖≤3%时,对奶粉的微生物学指标无影响,在酸奶中添加水苏糖加量≤5‰时,对酸奶的乳酸菌数无明显影响。
基于层次化时间stm软件设计的形式化验证
周宽久?,龙涛?,王小龙?,,侯刚?
计算机科学 , 2014, DOI: 10.11896/j.issn.1002-137X.2014.08.008
Abstract: 状态迁移矩阵(statetransitionmatrix,stm)是一种基于表结构的程序建模语言。事件变量类型单一,事件和状态数量的增加很容易造成状态空间爆炸问题,无法表达具有时间语义的软件系统等原因,极大限制了该建模方法的推广应用。文中针对这些问题,首先提出层次化时间状态迁移矩阵(hierarchicaltimestatetransitionmatrix,htstm)模型,用于设计、建模和验证具有时间条件约束的软件系统,并给出形式化表示方法。基于该表示方法提出一种符号化编码方法,采用有界模型检测思想将需要验证的ltl性质输入smt(satisfiabilitymodulotheories)求解器进行验证,从而在一定程度上证明了软件设计的正确性。
模型检测中状态爆炸问题研究综述
侯刚?,周宽久?,,龙涛?,王小龙?
计算机科学 , 2013,
Abstract: 模型检测已成为保证软件系统正确性和可靠性的重要手段,但随着软件功能日益强大,其规模和复杂度也越来越大,在模型检测过程中容易产生状态爆炸问题。如何解决模型检测中的状态爆炸,已成为工业界和理论界无法回避的重要课题。系统地综述模型检测领域解决状态爆炸问题的关键技术和主要方法,并提出该领域的最新研究进展与方向。
溶磷细菌和丛枝菌根真菌接种对南方红豆杉生长及根际微生物和土壤酶活性的影响
付晓峰,张桂萍,张小,
- , 2016,
Abstract: 以南方红豆杉实生苗为材料,采用盆栽实验探讨了高效溶磷细菌草木樨中华根瘤菌(Sinorhizobium meliloti)CHW10B与丛枝菌根真菌缩球囊霉(Glomus constrictum)单独和双接种条件下,其植株生长、根际土壤可培养微生物数量、土壤酶活和土壤微生物功能多样性变化,在微生态水平揭示接种对南方红豆杉生长的影响及其机制。结果表明:(1)各接种处理对南方红豆杉幼苗均有促生长作用,接种处理苗高、地径和生物量均较对照显著增加,并以双接种促进效果最好。(2)各接种处理提高了南方红豆杉根际土壤可培养细菌、真菌和放线菌含量,增加了土壤微生物碳源利用率,改变了土壤中物种的丰富度和均一度,增加了土壤中的生物多样性。(3)各接种处理促进了南方红豆杉根际重要土壤酶(酸性磷酸酶、脱氢酶、转化酶)活力的增加,且双接种的促进作用最为明显。可见,溶磷细菌(草木樨中华根瘤菌CHW10B)和丛枝菌根真菌(缩球囊霉)具有协同作用,两者同时接种可显著提高南方红豆杉根际土壤微生物数量及土壤酶活力,提高土壤微生物碳源利用率和土壤肥力,增加土壤中的生物多样性,从而达到间接促进宿主植物南方红豆杉生长的目的。
基于N-KD树的空间点数据分组算法
魏海涛,杜云艳,浩玮,刘张,,许开辉
地球信息科学学报 , 2015, DOI: 10.3724/SP.J.1047.2015.00001
Abstract: 随着科学技术的进步,地理空间数据的分析处理面临着数据量膨胀和计算量高速增长的双重挑战,为了解决海量数据处理速度慢的问题,本文针对空间分布不均匀的点数据,从数据并行的角度,以保持数据的空间邻近性及保证数据分组后各组数据量负载均衡为目标,提出基于N-KD树(Number-KDimensionTree)数据动态分组的方法,其是一种面向实时变化(数据量和数据空间范围变化)的空间数据动态分组方法。该方法借鉴K-D树的创建和最临近点搜索的思想,通过方差判断数据分布稀疏程度,利用最临近点搜索方法处理边界点,实现空间范围的不均等切分,保证数据分组后各组数据量基本均衡。试验表明,该方法具有较好的动态分组效果与较高的计算效率;支持各种分布状态的空间点数据的分组;分组后各组数据量负载均衡;分组算法本身有支持并行、支持分布式协同工作模式的特点。
联合循环电站除尘技术进展
迟化昌李志权赵桂英王凯仲权
热力发电 , 2009,
Abstract: 分析了整体煤气化联合循环(igcc)和增压流化床联合循环(pfbc[cd*2]cc)系统中除尘装置的工艺特点,并对各种除尘工艺发展现状进行了介绍。对工艺中用到的各种高温气体除尘装置如旋风分离器、颗粒床过滤器、刚性陶瓷过滤器、金属过滤器、湿式洗涤、静电除尘器等的特点进行分析,给出了各自的优缺点及研究进展情况。
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