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Search Results: 1 - 10 of 18627 matches for " 翟资雄 "
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沥青搅拌设备烘干筒参数对骨料温升的影响
Influence of rotary dryer parameters on aggregates temperature??rise in asphalt mixing plant

张晨光,焦生杰,谢立扬,,顾海荣
- , 2018,
Abstract: 为了提高烘干筒的传热效率,以LB4000型沥青搅拌设备的烘干筒为研究对象,在分析烟气流体、固态骨料以及烘干筒壁之间辐射、对流、接触多种传热过程耦合作用的基础上,针对料帘区域建立了一维轴向传热模型,采用4阶Runge??Kutta算法分工况对模型进行了数值求解;分析叶片圆周数量和烘干筒转速对骨料温升的影响,采用基于??Eulerian????Eulerian算法的离散元?擦魈辶ρя詈戏抡妫?EDEM??FLUENT)对烘干筒的传热过程进行了数值模拟,并对传热模型进行验证。研究结果表明:骨料进料率和料帘换热面积是影响骨料温升的主要因素,料帘特性对烘干筒传热效率有重要影响,平均每增加1 m??2料帘换热面积,骨料的最终加热温度升高约1.3 ℃;叶片圆周数量由15片增加到20片,有利于增大料帘料量,加大换热面积,骨料最终加热温度明显升高,且骨料进料率越小温升幅度越大;提高烘干筒转速可增大料帘料量,但同时会缩短骨料在筒内的滞留时间,当烘干筒回转角速度为0.8 rad/s时,料帘换热效率与骨料在筒内滞留时间的匹配最佳,骨料最终加热温度最高,增大或减小烘干筒转速均会对骨料温升产生不利影响;在优化烘干筒结构参数,提高传热效率的同时,应避免因料帘与烟气换热过于充分而造成排烟温度过低,对后续的引风除尘系统带来不利影响。
To improve heat transfer efficiency of rotary dryer, based on the rotary dryer of LB4000 series asphalt mixing plant and the analysis of coupling effect of heat radiation, convection and contact transfer processes between flue fluid, solid aggregates and drum wall, one??dimension axial heat transfer model was established for aggregates curtain area, the model was solved by the fourth order Runge??Kutta method to analyze the influence of the blade circumference and rotational speed of rotary dryer on aggregate temperature rise, based on the EDEM??FLUENT. The results show that aggregates feed rate and heat transfer area of aggregates curtain are the main factors affecting the aggregates heating temperature,the characteristic of aggregates curtain has an important influence on the heat transfer efficiency of rotary dryer with an average increase of 1 m??2 heat transfer area, the aggregates heating temperature is raised by about 1.3 ℃. The increase of blade circumference from 15 to 20 is beneficial to the increase the amount of aggregates curtain, the area of hear transfer, finale heating temperature of aggregates, and the smaller the aggregates feed rate, the higher the temperature rise increase rotational speed of rotary dryer can increase the amount of aggregates curtain, but also can shorten the residence time of them in the drum, and when the rotational speed is 0.8 rad?s????-1??, the heat transfer efficiency of aggregates curtain is matched perfectly with the residence time of aggregates, in the drum aggregates heating temperature is the highest, so that increasing or decreasing the rotational speed will both have an adverse effect on the aggregates temperature rise, while optimizing the rotary dryer parameters and improving the heat transfer efficiency, it should be avoided that heat transfer between aggregates curtain and gas is too full to cause the low exhaust gas temperature, which will lead to adverse effects on the following dust??removal system. 2 tabs, 8 figs, 26 refs
面向复杂网络存储系统的元胞自动机动力学分析方法
陈进才?,何平?,
软件学报 , 2008,
Abstract: 大规模网络存储系统中复杂的数据传输行为隐藏着一定的动力学规律性.针对基于对象的大规模网络存储系统,结合存储对象的智能性和主动性特征,分别在宏观与微观两个层次上提出了用于复杂网络存储动态行为规律分析的存储元胞自动机模型snca和osdca.在snca模型中,对网格拓扑结构的存储网络,结合存储对象的生命周期属性,可在宏观上分析网络存储系统的数据流动规律,确定存储网络拥塞程度,仿真结果揭示数据对象流动和存储网络中的相变具有全局相关性;在osdca模型中,综合热点数据的迁移和复制机制,在微观上分析i/o负载动态分布特性和存储热点迁移规律,仿真结果表明对象存储系统中的数据分布具有一定的自组织特性.
绿色网络存储系统的动力学分析模型
,冯丹,陆承涛,金超?
计算机科学 , 2011,
Abstract: 分析和研究了复杂网络存储系统中能耗管理控制的动力学行为规律。通过分析网络存储系统中的磁盘能耗模型,提出一种针对分布式网络存储系统的理想化能耗优化数据布局模型(ieedp)。在此基础上,结合数据迁移和数据复制技术,提出一种基于二维元胞自动机的绿色网络存储系统模型(gnssca)。实验表明,通过节点的局部性调节行为,该系统呈现出复杂的时空演化现象。系统总体副本个数随着负载的增加而出现相应的增加并最终趋于稳定。在负载较低的情况下,节点的访问队列长度嫡出现近似的幂律分布。
一种基于统计分析的存储系统性能调优方法
陆承涛,冯丹,王芳,
计算机科学 , 2010,
Abstract: 计算机系统参数的合理配置能有效提升应用程序的性能。以nfs网络存储系统为例,提出了一种基于统计分析的存储系统性能调优方法,该方法分为关键系统参数识别和关键参数性能优化两个子阶段。阶段一采用方差分析(anova)来建模系统参数的性能灵敏度,识别出对应用性能有显著影响的关键系统参数;然后在此基础上,阶段二采用响应面分析(rsm)来考察各关键参数对性能响应的影响,并综合前两个子阶段给出了性能调优算法,通过该算法找出系统的最优配置,从而最终达到性能调优的目的。最后,用实验评价了文中方法在web,e-mail,fileserver,linux实用程序以及微基准测试等多种重要应用场景下的性能调优结果,实验结果证实了该调优方法的有效性和实用性。
外加电场对边界润滑条件下钢―钢摩擦副摩擦磨损性能的影响
文杰,山本
摩擦学学报 , 2000,
Abstract: 利用球-盘式摩擦磨损试验机,考察了钢-钢(SUJ2/S45C)摩擦副在不同润滑剂润滑下的摩擦磨损性能及外加电场对摩擦磨损性能的影响。结果表明:施加电压,特别是改变电压极性可使摩擦副的摩擦磨损性能发生很大变化,而电场及其极性对摩擦磨损性能的影响效果取决于润滑剂及边界润滑膜的性质。
中国空间结构三十年抗震研究的发展和展望
薛素铎,张毅刚,,
工业建筑 , 2013, DOI: 10.13204/j.gyjz201306022
Abstract: 围绕抗震分析方法、精细化模型及结构振动控制技术等几个方面,对过去三十年来中国空间结构抗震分析理论的发展历程及主要研究成果进行总结。针对大跨空间结构复杂效应分析理论、性能化抗震设计方法研究等方面,探讨空间结构抗震研究面临的主要问题和发展方向。
被动控制技术在大跨空间结构中的应用概况
薛素铎,蔡炎城,,
世界地震工程 , 2009,
Abstract: 结构被动控制技术将传统的依靠结构自身强度和刚度来增强结构抗力的设计方法转变为利用控制装置吸收并耗散振动能量,是抗震防灾的一种积极有效的设计手段。基于被动控制机理,分别从隔震、消能减震和调谐减震3种途径系统总结了被动控制技术在大跨空间结构中的应用概况,介绍了相应的控制措施和控制效果,给出了实用性的结论,结果可为大跨空间结构的工程设计提供参考。本成果对推动振动控制手段在大跨空间结构中的实际应用具有积极意义。
法治中国语境下指导性案例的分类适用

法制与社会发展 , 2013,
Abstract:
女子赛艇2000 m模拟比赛划过程中能量代谢和能效特点
Characteristics of Energy Metabolism and Energy Efficiency of Women’s 2000m Race on Rowing Dynamometer


- , 2015, DOI: 10.19582/j.cnki.11-3785/g8.2015.09.019
Abstract: 摘要:为探究赛艇项目2000 m比赛过程运动员机体的能量代谢特征和能效特点,选取某省女子赛艇运动员21名,根据其训练年限分成三组,采用赛艇测功仪进行2000 m模拟比赛划,并结合国内外相关的文献进行统计分析,结论如下:1)赛艇运动员采用测功仪进行2000 m全力划过程中其有氧和无氧供能比例分别为85.0 %和15.0 %,且该比例不会因为训练年限和训练水平的高低而发生较大的变化;2)无氧无乳酸和无氧乳酸供能部分的差异可能受到了赛艇运动员训练水平、性别等因素的影响;3)高水平的赛艇运动员相比低水平而言需要更多的有氧能耗;4)赛艇运动员的内部能效与其训练年限成正比。根据结论可知,赛艇运动员水平的高低取决于机体的有氧供能系统和无氧无乳酸供能系统,建议在训练中应该采用“两极化”训练模式,即以发展有氧供能的有氧训练(低强度)和无氧无乳酸供能的超高强度速度训练或短距离冲刺训练为主。
Abstract: In order to explore the characteristics of energy metabolism and energy efficiency in 2000m rowing, 21 female rowers participated in this research, and they were divided into three groups according to their training length, and they underwent 2000m race on rowing dynamometer. Data was analyzed. Conclusions are as follows: 1) The ratio of aerobic and anaerobic energy supply is 85% and 15% respectively, and it will not change with the length of training or training level. 2) The difference of anaerobic energy supply with lactic acid or without lactic acid may be influenced by training level and gender. 3) Compared with normal rowers, elite rowers need more aerobic energy supply. 4) Energy efficiency is proportional to length of training in rowers. Thus, rowers’ performance is dependent on aerobic energy supply system and anaerobic energy supply without lactic acid system; we suggest using polarized-training model that developed low intensity aerobic training (aerobic energy supply) as well as super-high intensity training or short distance sprint training (anaerobic energy supply without lactic acid)
Dynamics Analysis Method of Cellular Automata for Complex Networking Storage System
面向复杂网络存储系统的元胞自动机动力学分析方法

CHEN Jin-Cai,HE Ping,GE Xiong-Zi,
陈进才
,何 平,

软件学报 , 2008,
Abstract: Some inherent dynamics rules are concealed in large-scale network storage system on account of the complexity of data transmission behaviors.This paper studies object-based storage system and proposes two storage cellular automata models called SNCA and OSDCA from macro and micro aspect respectively,and these models can be used to analyze behaviors and rules of complex and dynamic network storage by capturing the intelligent and initiative properties of storage object.In the model SNCA,the lifetime attribute of storage object is used to analyze the data flow rules in storage network to ascertain the congestion degree from macro aspect based on special lattice network topology architecture,and simulation results show that data object flow has global relativity with the phase transition of data flow.In the model OSDCA,data migration and replication mechanism are combined to analyze hotspot migration rule based on the load distribution condition among storage nodes,and simulation results show that data distribution in OBS system has characters of some self-organization.
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