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Search Results: 1 - 10 of 302712 matches for " 李云鹏 "
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空间物体光照特性分析与应用
Analysis and Applications on Sunlighting Characteristics of Space Objects
 [PDF]

怡勇, , 陈勇,
Journal of Aerospace Science and Technology (JAST) , 2014, DOI: 10.12677/JAST.2014.23006
Abstract:
本文分析太阳、地球和空间物体轨道运动的基本耦合关系,构建空间物体光照问题的一般数学模型;对空间物体光照的影响参数进行分析,探讨不同参数的变化范围、周期及对目标光照的影响程度,针对常见的圆轨道讨论长半轴对受晒因子的影响,建立圆轨道的全轨道受晒方程;进一步探讨空间物体光照特性在空间目标光学探测与跟踪、太阳敏感器、太阳光压作用、空间太阳能发电等空间活动中的应用,分析给出主要应用的发展方向、关键技术或技术性能,为相关研究提供理论参考。
Based on the primary orbital relation among sun, earth and space object, the mathematic model of space object sunlighting problem is made. Effects of various parameters and their change field, period, etc. for space target sunlighting are analyzed. As the most familiar satellite orbit, the rela-tion between the sunshine factor of the circle orbit and its semi-major axis is discussed, and whole orbital sunshine equation of circle orbit is made. Furthermore, many applications of sunlighting characteristics of space objects in space activities are studied, such as the optical detecting and the tracking of space targets, the sun sensor, the radiation pressure effect and the space solar power system. And developing aspects, key techniques or technical characteristics of these applications are analyzed. These results will help to study practical problems further.
Maxwell模型薄板的自由振动

力学与实践 , 1997, DOI: 10.6052/1000-0992-1999-412
Abstract: 本文利用Maxwel粘弹性模型建立了粘弹性薄板的振动微分方程,给出四边简支粘弹性矩形薄板的固有频率解析解.对粘弹性矩形薄板的振动特性进行了讨论
某水电站近坝库岸滑坡涌浪预测研究
Surge Prediction Study of Reservoir Bank Landslide near a Hydropower Dam
 [PDF]

, 吴佳壕,
Advances in Geosciences (AG) , 2015, DOI: 10.12677/AG.2015.53015
Abstract:
水电站建设及建成发电运行以后,伴随着水库蓄水,往往不同程度地触发岸坡岩土体失稳,不仅影响工程建设的实施,而且对拦河大坝和周围人民群众的生命财产安全造成严重威胁。本文以某水电站近坝库区的荒田滑坡为例,分析其滑动成因和机制;在启动速度和下滑速度计算的基础上,对其滑动入水后形成的涌浪进行分析和量化计算。根据山区河道型水库的特点提出弯道系数的概念并修正潘家铮计算公式,该系数主要由大坝附近涌浪监测结果反分析获得。基于数值计算确定不同水位情况下的失稳范围,采用上述修正方法对库区一处潜在失稳区岩土体进行滑动入水后的涌浪预测,从而获得较为可靠的预测结果,为水电站的安全运行提供重要依据。
The reservoir storage, in the process of hydropower station construction or operation, often triggers a large number of reservoir bank slope instability of rock and soil mass in different degrees, which not only affect the implementation of the project construction, but also seriously threaten the river dam and surrounding people’s safety. The Huangtian landslide in a hydropower station reservoir area close to the dam was taken as an example, the sliding causes and mechanism of which were analyzed in this paper; on the basis of start-up speed and slip velocity calculation, the surge after sliding into the water was analyzed and quantified. The concept of curve coefficient that obtained from the surge monitoring results nearby the dam by inverse analysis was proposed according to the characteristics of mountainous river reservoir and used to amend the Pan Jiazheng formulas about the surge. Based on the instability scope which was determined by numerical calculation under different water conditions, the surge was forecasted by the above method when the rock and soil in a potentially unstable reservoir area can slide into the water, so as to obtain more reliable predictions and provide an important basis for the safe operation of hydropower station.
烘丝机设备参数与叶丝质量关系研究—以红河卷烟厂某牌号叶丝为例
The Study on the Relationship between the Cut Tobacco Drier Equipment Parameters and the Tobacco Leaf Silk Quality—Based on the Data of a Brand Leaf Silk in Honghe Cigarette Factory
 [PDF]

袁存波,, ,, 李萍
Statistics and Applications (SA) , 2015, DOI: 10.12677/SA.2015.43020
Abstract: 烘丝机设备参数直接影响着烘后叶丝物理指标、卷烟后序加工质量及卷烟内在品质。本文采用回归设计试验,系统探讨了红河某牌号烟丝生丝含水率、工艺流量、HT蒸湿压力、烘丝机筒壁温度、热风温度、排潮风门开度6个设备参数与烘后叶丝的含水率、填充值、整丝率、碎丝率、化学成分等质量特性的关系,建立了烘丝机设备参数与烘后叶丝含水率、填充值、叶丝绿原酸和糖碱比的统计模型。结果表明:为保障烘后叶丝含水率均匀一致,应重点关注生丝含水率的波动;为提高叶丝填充值,可适当降低生丝含水率,同时增加HT蒸汽压力和筒壁温度。
Cut tobacco drier equipment parameters directly affect the leaf silk physical indicators, the quality of cigarette after drying processing and cigarette inner quality. Using regression design experiment, this paper systematically discusses the relationship of the tobacco moisture content, process flow, steam pressure of HT, the temperature of hot-air and cylinder wall, the opening of the exhausted valve among the tobacco moisture contents, filling power, the proportion of long strands, the proportion of small strands, and chemical component. Statistical model of cut tobacco drier equipment parameters and silk moisture content after drying, filling power, leaf silk chlorogenic acid, and ratios of total sugar to betaine is established. Results show that in order to ensure silk moisture content after drying uniformity, we should focus on the fluctuation of raw silk moisture content; in order to improve the leaf silk filling power, we should reduce the moisture content of raw silk appropriately and increase the steam pressure of HT and the temperature of cylinder wall at the same time.
长江荆江河段设计洪水研究
Study on Design Flood of the Jingjiang Reach in the Yangtze River
 [PDF]

冯凌,, 吕孙,
Journal of Water Resources Research (JWRR) , 2015, DOI: 10.12677/JWRR.2015.46069
Abstract:
设计洪水是防洪评价及工程建设的基础。本文立足于荆江枝城至石首河段,梳理了三峡建库后河段的设计洪水。依据三峡水库防洪调度规则,计算了枝城站在0.33%,1%,5%,10%频率下的设计洪水;在总入流控制条件下,结合区间支流分流比曲线和站点水位流量关系,依次得到相应频率下沙市站和石首站的设计洪水。研究所得到的洪水设计值偏于安全,可为荆江河段防洪和工程设计提供科学参考依据。
Design flood is the foundation of flood control evaluation and engineering construction. The Jingjiang reach between Zhicheng and Shishou stations is selected as case study to estimate design flood after the impounding of Three Gorges Reservoir. The design flood of 0.33%, 1%, 5%, 10% frequencies at Zhicheng station is calculated under the flood dispatching rule of Three Gorges Reservoir. Through combining the interval tributary diversion ratio and stage-discharge relation, the design floods at Shashi and Shishou stations are confirmed in the same frequency under total inflow control. The design values are relatively safe and can provide scientific reference for the Jingjiang reach flood control and engineering design.
轻度认知损伤的语义记忆研究述评
,
心理科学进展 , 2009,
Abstract: 轻度认知损伤(Mild cognitive impairment,MCI)是介于正常老化与痴呆之间的过渡阶段,表现为与年龄和教育程度不相称的认知功能减退。本文回顾了近期有关MCI语义记忆的研究,分析比较了各研究的实验任务及结果,得出MCI患者存在一定程度的由多种原因造成的语义记忆损伤,语义记忆测验对MCI的早期筛查和转归预测有重要作用。最后指出将来的研究需要将包括语义记忆成分在内的多种认知测验相结合,以便及早发现有可能发展为痴呆的危险个体并开展相应干预。
Design of lightweight MVC framework based on J2ME
一种基于J2ME的轻量级MVC框架设计

,
重庆邮电大学学报(自然科学版) , 2008,
Abstract: J2ME移动设备有限的计算能力和存储资源无法满足目前适用于桌面或Web应用中的开发框架的资源需求。通过借鉴J2EE平台流行MVC框架Struts,针对J2ME平台特点,在网络连接、视图管理和数据存储等模块进行适当地裁减和优化,提出了一种基于J2ME的轻量级MVC开发框架—Mobile Struts。分析发现,该框架有利于明确J2ME应用软件开发任务分工、提高模块化程度、缩短开发周期。
文化血脉中的“捣衣”精神———慕容鲜卑《阿干之歌》和渤海国《夜听捣衣诗》比较
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民族文学研究 , 2015,
Abstract: 《阿干之歌》和《夜听捣衣诗》分别是不同时代的民族文学精品,两部作品的契合点是“捣衣”精神,即渴望和平、向往安宁,思念家乡、企盼回归,眷恋亲人、等待团圆,这样的精神一直流淌在中华民族的文化血脉之中。千百年来,各族文学家,通过他们的作品抒发着爱好和平、重视亲情、维护统一的情愫,多样性的文学又统一于同一性的文化血脉。
一种基于J2ME的轻量级MVC框架设计
,
重庆邮电大学学报(自然科学版) , 2008,
Abstract: J2ME移动设备有限的计算能力和存储资源无法满足目前适用于桌面或Web应用中的开发框架的资源需求。通过借鉴J2EE平台流行MVC框架Struts,针对J2ME平台特点,在网络连接、视图管理和数据存储等模块进行适当地裁减和优化,提出了一种基于J2ME的轻量级MVC开发框架—MobileStruts。分析发现,该框架有利于明确J2ME应用软件开发任务分工、提高模块化程度、缩短开发周期。
基于SIP和P2P的移动设备远程控制
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重庆邮电大学学报(自然科学版) , 2008,
Abstract: 针对现有移动设备远程控制方案在覆盖范围、网络承载能力和控制信令标准化方面的不足,结合P2P网络高数据承载能力和SIP协议在3G网络标准化中的核心作用,提出了一种新的基于SIP和P2P的层叠网络工作模式,在此基础上设计了一套移动设备远程控制的解决方案,并实现了一个简单但完整的原型系统。该方案具有覆盖范围广、承载能力高和标准化的特点。
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