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Evolutionary snowdrift game on heterogeneous Newman-Watts small-world network 被引量:1
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作者 杨涵新 高坤 +1 位作者 韩筱璞 汪秉宏 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第8期2759-2763,共5页
We study the evolutionary snowdrift game in a heterogeneous Newman-Watts small-world network. The heterogeneity of the network is controlled by the number of hubs. It is found that the moderate heterogeneity of the ne... We study the evolutionary snowdrift game in a heterogeneous Newman-Watts small-world network. The heterogeneity of the network is controlled by the number of hubs. It is found that the moderate heterogeneity of the network can promote the cooperation best. Besides, we study how the hubs affect the evolution of cooperative behaviours of the heterogeneous Newman-Watts small-world network. Simulation results show that both the initial states of hubs and the connections between hubs can play an important role. Our work gives a further insight into the effect of hubs on the heterogeneous networks. 展开更多
关键词 complex networks snowdrift game COOPERATION heterogeneous Newman-Watts small-world network
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Evolutionary snowdrift game with disordered environments in mobile societies
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作者 关剑月 吴枝喜 汪映海 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第12期3566-3570,共5页
We investigate an evolutionary snowdrift game on a square N : L × L lattice with periodic boundary conditions, where a population of no (no ≤ N) players located on the sites of this lattice can either coopera... We investigate an evolutionary snowdrift game on a square N : L × L lattice with periodic boundary conditions, where a population of no (no ≤ N) players located on the sites of this lattice can either cooperate with or defect from their nearest neighbours. After each generation, every player moves with a certain probability p to one of the player's nearest empty sites. It is shown that, when p = 0, the cooperative behaviour can be enhanced in disordered structures. When p 〉 0, the effect of mobility on cooperation remarkably depends on the payoff parameter r and the density of individuals ρ (ρ = no/N). Compared with the results of p = 0, for small r, the persistence of cooperation is enhanced at not too small values of p; whereas for large r, the introduction of mobility inhibits the emergence of cooperation at any p 〈 1; for the intermediate value of r, the cooperative behaviour is sometimes enhanced and sometimes inhibited, depending on the values of p and p. In particular, the cooperator density can reach its maximum when the values of p and p reach their respective optimal values. In addition, two absorbing states of all cooperators and all defectors can emerge respectively for small and large r in the case of p 〉 0. 展开更多
关键词 snowdrift game disorderd lattice MOBILITY COOPERATION
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Spatial snowdrift game in heterogeneous agent systems with co-evolutionary strategies and updating rules
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作者 夏海江 李萍萍 +1 位作者 柯见洪 林振权 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第4期22-35,共14页
We propose an evolutionary snowdrift game model for heterogeneous systems with two types of agents, in which the inner-directed agents adopt the memory-based updating rule while the copycat-like ones take the uncondit... We propose an evolutionary snowdrift game model for heterogeneous systems with two types of agents, in which the inner-directed agents adopt the memory-based updating rule while the copycat-like ones take the unconditional imitation rule; moreover, each'agent can change his type to adopt another updating rule once the number he sequentially loses the game at is beyond his upper limit of tolerance. The cooperative behaviors of such heterogeneous systems are then investigated by Monte Carlo simulations. The numerical results show the equilibrium cooperation frequency and composition as functions of the cost-to-benefit ratio r are both of plateau structures with discontinuous steplike jumps, and the number of plateaux varies non-monotonically with the upper limit of tolerance VT as well as the initial composition of agents faO. Besides, the quantities of the cooperation frequency and composition are dependent crucially on the system parameters including VT, faO, and r. One intriguing observation is that when the upper limit of tolerance is small, the cooperation frequency will be abnormally enhanced with the increase of the cost-to-benefit ratio in the range of 0 〈 r 〈 1/4. We then probe into the relative cooperation frequencies of either type of agents, which are also of plateau structures dependent on the system parameters. Our results may be helpful to understand the cooperative behaviors of heterogenous agent systems. 展开更多
关键词 cooperative behavior evolutionary snowdrift game heterogeneous agent system
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Dormancy Characteristics of Malus ‘Snowdrift’ and Effects of Spraying 6-benzyladenine on Its Germination and Flowering in Long-day Treatment
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作者 Jiayi LIU Ying WANG +2 位作者 Lin WU Sadao KOMORI Manabu WATANABE 《Agricultural Science & Technology》 CAS 2017年第4期570-574,共5页
[Objective] The dormancy characteristics of Malus ‘Snowdrift’ in long-day treatment were studied, and 6-BA was used to break the dormancy, with the aim to achieve the purpose of flowering in autumn. [Method] The new... [Objective] The dormancy characteristics of Malus ‘Snowdrift’ in long-day treatment were studied, and 6-BA was used to break the dormancy, with the aim to achieve the purpose of flowering in autumn. [Method] The new shoots of ‘Snowdrift’ in long-day treatment were conducted with hydroponics to investigate their dormancy time. And cytokinin 6-benzyladenine(6-BA)was used to treat the dormant shoots, to investigate the budding, flowering and flower bud differentiation. [Result] The shoots in long-day treatment entered endodormancy after August 7^(th) and the shoots in the natural daylight entered endodormancy before July 18^(th). In long-day treatment, 116 buds, 198 flowers were observed after 6-BA spraying. [Conclusion] The optimum concentration of 6-BA was 300 mg/L. And the flower bud differentiation of ‘Snowdrift’ in long-day treatment was faster than those in natural daylight after 6-BA spraying. 展开更多
关键词 Malus snowdrift Long-day treatment Dormancy 6-benzyladenine(6-BA)
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Cooperation and Phase Separation Driven by a Coevolving Snowdrift Game
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作者 杜鹏 许晨 章雯 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第5期170-173,共4页
We investigate the cooperative behavior and the phase separation in a coevolving system. Agents in the system constructed by a regular random network initially play the snowdrift game with their neighbors. They try to... We investigate the cooperative behavior and the phase separation in a coevolving system. Agents in the system constructed by a regular random network initially play the snowdrift game with their neighbors. They try to obtain a better competing environment by imitating a neighbor's more successful strategy or cutting the connection to a defective neighbor and randomly rewiring to another agent so as to seek a better neighborhood. The dynamic process of strategy imitation and relationship among agents due to rewiring neighbors may drive the system into different states. The simulation results show that there are three different phases in the q-r plane, where q is the rewiring probability and r is the cost-to-benefit ratio. One is a static phase of a pure cooperative cluster with a few isolated defectors. The other two belong to active phases with one of a main mixed-strategy cluster and the other of a pure defective state. We find that a simple mean field theory can predict correctly the static phase and the active phase of the main mixed-strategy cluster. The theoretical boundary line between the two phases is in good agreement with the simulation result. 展开更多
关键词 Cooperation and Phase Separation Driven by a Coevolving snowdrift Game MFT
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Similarity Study on Snowdrift Wind Tunnel Test
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作者 Weihua Wang Haili Liao +1 位作者 Mingshui Li Hanjie Huang 《Open Journal of Civil Engineering》 2013年第3期13-17,共5页
The model for snowdrift wind tunnel test needs to be similar with the prototype. Based on detailed analysis in aspects of geometry, kinematics and dynamics, the major similarity parameters that need to be satisfied ar... The model for snowdrift wind tunnel test needs to be similar with the prototype. Based on detailed analysis in aspects of geometry, kinematics and dynamics, the major similarity parameters that need to be satisfied are gained. The contradiction between the Reynolds number and Froude number as well as the problem of time scale is introduced, and the selections of the model parameters are specified. Lastly, an example of snowdrift wind tunnel test by adoption of quartz sand as the model of snow grains is presented. The flow field and the snow distributions on a typical stepped roof were investigated. The results show that the flow filed characters are in good agreement with the field observations, and the stepped roof snow depth distributions are basically consistent with the observation results. 展开更多
关键词 SIMILARITY PARAMETERS WIND TUNNEL Test snowdrift ROOF
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防雪栅对铁路路堑风致雪堆积防治效果研究
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作者 马文勇 李赛 +3 位作者 魏腾博 李江龙 孙元春 李飞强 《铁道学报》 EI CAS CSCD 北大核心 2024年第4期148-155,共8页
针对铁路路堑易发生严重积雪灾害的问题,采用风洞试验方法,研究了防雪栅在减轻风致积雪灾害方面效果,为铁路线路防灾工程设计提供参考。在风洞中,首先分别试验了在6.5、7.5、8.5 m/s风速下边坡比为1∶4和1∶1.5的路堑内雪粒堆积演化过程... 针对铁路路堑易发生严重积雪灾害的问题,采用风洞试验方法,研究了防雪栅在减轻风致积雪灾害方面效果,为铁路线路防灾工程设计提供参考。在风洞中,首先分别试验了在6.5、7.5、8.5 m/s风速下边坡比为1∶4和1∶1.5的路堑内雪粒堆积演化过程;然后布置防雪栅,在相同试验条件下观测其在减轻路堑积雪灾害方面的效果;最后根据测量数据计算对比有无防雪栅时路堑路面积雪量差异,定量评估防雪栅防治效果。此外,采用数值模拟手段分析防雪栅、路堑周围流场变化情况,进一步解释防雪栅的防雪机理。结果表明:上风侧坡度较缓的半开敞式路堑积雪严重;防雪栅能有效减轻路堑积雪灾害;漂移雪粒首先在背风侧距离防雪栅较远处沉积,随吹风持续积雪范围向两端延伸;防雪栅使来流风速在其背风侧急剧减弱致使漂移雪粒发生沉积,雪粒输运强度减小,从而实现挡雪减灾目的。 展开更多
关键词 风吹雪 风洞试验 防雪栅 路堑 积雪分布
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基于WRF模式的康定地区风吹雪易发性判断
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作者 周雪 杨伟栋 +1 位作者 张珍 刘庆宽 《石家庄铁道大学学报(自然科学版)》 2024年第1期87-93,共7页
为给通过地形复杂,缺少气象资料的西南艰险山区的铁路研究风吹雪易发性提供方法,以位于该区域的四川省康定市为例,采用中尺度数值天气预报模式(The Weather Research and Forecasting Mode,WRF)对该区域气象要素的时空分布进行模拟.基于... 为给通过地形复杂,缺少气象资料的西南艰险山区的铁路研究风吹雪易发性提供方法,以位于该区域的四川省康定市为例,采用中尺度数值天气预报模式(The Weather Research and Forecasting Mode,WRF)对该区域气象要素的时空分布进行模拟.基于WRF模式中各种参数的特点,设计4种参数方案进行计算,采用双层网格嵌套达到降尺度模拟,为了高精度解析大气边界层过程,在竖直方向、近地面1.5km高度内加密为15层,提取康定站计算结果与观测结果进行比较.结果表明,WRF模式的计算结果符合康定市气候特征,气象要素的相关系数均高于0.5;风吹雪发生概率从高到低的区域依次为康定市东部和南部边缘的贡嘎山区,内部的大雪山段,以及位于101.7°E~102.0°E位置处的铁路线路,概率分别为19%、14%和12%,其他区域的概率低于4%. 展开更多
关键词 铁路灾害防治 风吹雪 易发性判断 数值模拟 WRF模式 参数化方案
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A novel snowdrift game model with edge weighting mechanism on the square lattice 被引量:1
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作者 Juan-uan Zhang Hong-yun Ning +4 位作者 Zi-yu Yin Shi-wen Sun Li Wang Jun-qing Sun Cheng-yi Xia 《Frontiers of physics》 SCIE CSCD 2012年第3期366-372,共7页
We propose a novel snowdrift game model with edge weighting mechanism to explore the cooperative behaviors among the players on the square lattice. Based on the assumption of three types of weight distribution includi... We propose a novel snowdrift game model with edge weighting mechanism to explore the cooperative behaviors among the players on the square lattice. Based on the assumption of three types of weight distribution including uniform, exponential and power-law schemes, the cooperation level is largely boosted in contrast with the traditional snowdrift game on the unweighted square lattice. Exten- sive numerical simulations indicate that the fraction of cooperators greatly augments, especially for the intermediate range of cost-to-benefit ratio r. Furthermore, we investigate how the cooperative behaviors are affected by the undulation amplitude of weight distribution and noise strength of strat- egy selection, respectively. The simulation results will be conducive to further understanding and analyzing the emergence of cooperation, which is a ubiquitous phenomenon in social and biological science. 展开更多
关键词 snowdrift game edge weighting mechanism cooperative dynamics
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公路风吹雪植物防治技术
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作者 徐兰钰 《黑龙江交通科技》 2024年第1期25-28,共4页
公路风吹雪对积雪寒冷地区公路交通的影响比较普遍且相对严重,与成本较高的金属或圬工类风吹雪防治设施相比,植物防治技术有其独特的优势。根据公路风吹雪的形成条件,营造防雪林、种植植被,或者适当利用路线两侧既有的草木植被,对风吹... 公路风吹雪对积雪寒冷地区公路交通的影响比较普遍且相对严重,与成本较高的金属或圬工类风吹雪防治设施相比,植物防治技术有其独特的优势。根据公路风吹雪的形成条件,营造防雪林、种植植被,或者适当利用路线两侧既有的草木植被,对风吹雪进行有效干扰,能够在防止风吹雪影响交通的同时,绿化公路环境,协调路线景观。综合分析,可采用适当的树木、合适的间距、合理的乔灌混种等方式来营造防雪林、防雪植被等,通过植物防治技术避免或减轻公路风吹雪雪害。 展开更多
关键词 风吹雪 防雪林 植被
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Effect of Growing Size of Interaction Neighbors on the Evolution of Cooperation in Spatial Snowdrift Game
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作者 张娟娟 王娟 +3 位作者 孙世温 王莉 王震 夏承遗 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第4期541-546,共6页
In this paper,we study the influence of the size of interaction neighbors(k) on the evolution of cooperation in the spatial snowdrift game.At first,we consider the effects of noise K and cost-to-benefit ratio r,the si... In this paper,we study the influence of the size of interaction neighbors(k) on the evolution of cooperation in the spatial snowdrift game.At first,we consider the effects of noise K and cost-to-benefit ratio r,the simulation results indicate that the evolution of cooperation depends on the combined action of noise and cost-to-benefit ratio.For a lower r,the cooperators are multitudinous and the cooperation frequency ultimately increases to 1 as the increase of noise.However,for a higher r,the defectors account for the majority of the game and dominate the game if the noise is large enough.Then we mainly investigate how k influences the evolution of cooperation by varying the noise in detail.We find that the frequency of cooperators is closely related to the size of neighborhood and cost-to-benefit ratio r.In the case of lower r,the augmentation of k plays no positive role in promoting the cooperation as compared with that of k = 4,while for higher r the cooperation is improved for a growing size of neighborhood.At last,based on the above discussions,we explore the cluster-forming mechanism among the cooperators.The current results are beneficial to further understand the evolution of cooperation in many natural,social and biological systems. 展开更多
关键词 spatial snowdrift game interaction neighborhood emergence of cooperation regular lattice
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Characteristics of snow cover distribution along railway subgrade and the protective effect of snow fences 被引量:1
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作者 LEI Jia CHENG Jianjun +3 位作者 GAO Li MA Benteng AN Yuanfeng DONG Hongguang 《Journal of Arid Land》 SCIE CSCD 2023年第8期901-919,共19页
Railways built in cold,snowy,and lightly populated areas are subjected to wind and snow disasters.In this study,we selected a snow hazard prevention and control section of the Altay–Zhundong Railway in Xinjiang Uygur... Railways built in cold,snowy,and lightly populated areas are subjected to wind and snow disasters.In this study,we selected a snow hazard prevention and control section of the Altay–Zhundong Railway in Xinjiang Uygur Autonomous Region of China as the research object.We investigated the deposited snowfall variation characteristics on the two sides and in the embankment pavement area of snow fences with different porosities,fence heights,and arrangement distances using single-factor tests and orthogonal tests based on global atmospheric reanalysis climate data,field survey data,and a multi-phase flow analysis model.The results showed significant differences in the characteristics of snow cover distribution and snow cover thickness between the embankment and the cutting in the absence of snow protection measures.The maximum snow cover thickness of the embankment pavement decreased by 12.6%relative to the cutting pavement.The snow cover thickness of the embankment exhibited an increasing trend from windward shoulder to leeward shoulder,whereas the snow cover thickness of the cutting presented a declining trend from windward shoulder to leeward toe.In the collaborative prevention and control of snow fences and embankments,the three factors can be ranked in terms of their sensitivity to deposited snowfall within the influence scope of snow fences as follows:fence height>arrangement distance>porosity.At the same time,fence height yielded a significant relationship for the influence scope of snow fences(P<0.05).The three factors can also be ranked in terms of their sensitivity to deposited snowfall on the pavement as follows:porosity>fence height>arrangement distance.For the embankment protection of the Altay–Zhundong Railway against wind and snow,snow fence with a porosity of 75%,a fence height of 4.8 m,and an arrangement distance from the embankment of 60 m produced the best snow control effect.By revealing the characteristics of snow cover distribution along railway subgrade and the protective effect of snow fences,this study provides valuable references for the engineering applications of railway construction in areas prone to wind and snow disasters. 展开更多
关键词 snowdrift numerical simulation orthogonal test porosity fence height arrangement distance Altay-Zhundong Railway
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基于PIV试验的积雪平屋面风场特性研究 被引量:1
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作者 郑云 刘志祥 +1 位作者 余志祥 傅彦青 《西南交通大学学报》 EI CSCD 北大核心 2023年第2期430-437,461,共9页
为研究屋盖积雪对低矮平屋面风场特性的干扰影响,基于风吹雪风洞试验,通过3D打印获得平屋面的3D积雪形态,并以无积雪模型作为对照,系统地开展了PIV (particle image velocimetry)风洞试验,并结合LES(large eddy simulation)方法,研究了... 为研究屋盖积雪对低矮平屋面风场特性的干扰影响,基于风吹雪风洞试验,通过3D打印获得平屋面的3D积雪形态,并以无积雪模型作为对照,系统地开展了PIV (particle image velocimetry)风洞试验,并结合LES(large eddy simulation)方法,研究了6组平屋面建筑有无积雪时的流场分布特性.试验研究表明:当无积雪时,来流在屋面前缘处分离后能形成典型的分离泡流动,分离泡内速度场存在明显逆流现象;当有积雪时,屋面上方的逆流减弱甚至消失,积雪显著地加快了流经屋面附近流场的速度,其最大速度增量约为0.6,同时,流线分布更贴合模型壁面,速度梯度增大,也相对增大了涡量值;积雪会使得屋面上方整体的时均湍动能和切应力均减小,但对屋面迎风区域的平均和脉动风压均有增大作用,其增大比值约为15%和20%.通过该研究可进一步对低矮建筑的风雪荷载作用机理展开分析,为屋盖结构的抗风雪设计提供参考. 展开更多
关键词 低矮建筑 PIV试验 屋盖积雪 流动特性 大涡模拟
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风吹雪积雪分布特征和铁路路基形式相关性研究 被引量:6
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作者 丁录胜 白明洲 李鹏翔 《北京交通大学学报》 CAS CSCD 北大核心 2023年第1期54-64,154,共12页
风吹雪现象会导致积雪的重分布,减少交通线路内的积雪对维护交通安全具有重要意义.本文基于铁路全线的风吹雪现象调查,采用欧拉多相流模型对不同铁路路堑形式的风雪场分布特征进行分析,并设计正交试验针对不同路基形式对积雪量的影响程... 风吹雪现象会导致积雪的重分布,减少交通线路内的积雪对维护交通安全具有重要意义.本文基于铁路全线的风吹雪现象调查,采用欧拉多相流模型对不同铁路路堑形式的风雪场分布特征进行分析,并设计正交试验针对不同路基形式对积雪量的影响程度进行分析.研究结果表明:风吹雪作用下,流速与雪深的变化趋势呈现负相关,路堤路基面会使流场加速减小雪量,路堑路基面会减弱流速增加积雪.路基结构形式的改变主要影响路基断面过流尺寸和路基内流速分布,其中路堑深度是影响轨道结构区域沉积雪量的主要因素.当路堑深度增加时,路基边坡和积雪平台可以更显著地发挥承载积雪的作用;放缓路堑边坡以及增加积雪平台宽度可以减缓路堑结构对风场的影响. 展开更多
关键词 铁路路基 风吹雪 数值模拟 流场分布 积雪量 因素分析
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尤路都斯盆地风吹雪成因特征及防治措施研究 被引量:1
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作者 廖昕 黄凯阳 +4 位作者 李梦恒 宋殿君 巫锡勇 文洪 凌斯祥 《工程地质学报》 CSCD 北大核心 2023年第4期1450-1460,共11页
风吹雪作为一种由气流挟带起分散的雪粒在近地面运行的二相流现象,在风的作用下发生迁移与重新沉积。风吹雪成灾是雪颗粒、大气流场、微地貌等因素多重作用的结果。拟建伊宁(伊)—阿克苏(阿)铁路穿越尤路都斯盆地,盆地冬春季气候寒冷,... 风吹雪作为一种由气流挟带起分散的雪粒在近地面运行的二相流现象,在风的作用下发生迁移与重新沉积。风吹雪成灾是雪颗粒、大气流场、微地貌等因素多重作用的结果。拟建伊宁(伊)—阿克苏(阿)铁路穿越尤路都斯盆地,盆地冬春季气候寒冷,降雪量较大,地面常形成较厚的积雪,发育有风吹雪灾害,可对研究区内交通工程安全造成潜在威胁。本文以新疆天山地区尤路都斯盆地风吹雪为研究对象,通过现场气象监测、冬季雪害调查等方法对盆地内积雪与风吹雪特征进行研究。进而以受风吹雪影响较大的拟建铁路阿尔先段为例,系统分析该区段风吹雪成因特征及其工程防治措施。研究发现尤路都斯盆地风吹雪宏观孕灾背景主要是受西伯利亚寒流和蒙古高压的影响,冷空气使盆地产生强劲西北向大风。低温和较低的湿度使得积雪能够以较低密度的形式持续存在,进而在较低风速下启动形成风吹雪。通过拟建铁路阿尔先段典型路堑工程数值模拟研究,得出积雪平台宽度宜设置为5m,下导风板与水平面夹角设为90°,下导风口高度设置为1.6m,下导风板板高设置为5m。研究成果可为寒区交通建设防灾减灾提供有益借鉴。 展开更多
关键词 风吹雪 成因分析 防治措施 尤路都斯盆地
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G7高速公路下涝坝互通路基风吹雪研究 被引量:1
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作者 叶尔木拉提·木哈得尔 《中国民航大学学报》 CAS 2023年第1期47-52,共6页
为了解高速公路互通立交路段路基的风吹雪特征并为后期挡雪设施提供理论依据,通过风场监测、现场积雪调查和数值模拟等方法,对新建京新高速公路(G7)巴里坤至木垒下涝坝段互通路基的风速风向及积雪分布特征进行了研究。风场监测结果表明... 为了解高速公路互通立交路段路基的风吹雪特征并为后期挡雪设施提供理论依据,通过风场监测、现场积雪调查和数值模拟等方法,对新建京新高速公路(G7)巴里坤至木垒下涝坝段互通路基的风速风向及积雪分布特征进行了研究。风场监测结果表明,该路段风向不稳定,优势风向为西北风;数值模拟结果表明,互通路段相邻两匝道路基高差和间距影响下风侧路基的风速和积雪分布,当路基间距和高差分别为10 m、2 m和50 m、7 m时,下风侧路基风速相比主线路基分别下降了约35%和53%,路面积雪分别增加了14.0%和18.5%。积雪调查显示匝道积雪规律与数值模拟结果相符,应视下风侧匝道积雪情况在互通外侧合理布设防雪设施。 展开更多
关键词 高速公路 互通路基 风吹雪 风速风向 积雪分布
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黑龙江省公路风吹雪灾害形成机理与分布特征 被引量:8
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作者 张家平 武鹤 +2 位作者 孟上九 高伟 魏建军 《自然灾害学报》 CSCD 北大核心 2008年第3期130-133,共4页
分析了风吹雪灾害形成的因素和机理,并结合黑龙江省4条主要公路的风吹雪灾害调查数据,对该省公路风吹雪灾害的分布特征进行了分析。结果指出,气候和地形条件,特别是公路路线走向、路基横断面形式以及路基高度对风吹雪灾害的形成具有主... 分析了风吹雪灾害形成的因素和机理,并结合黑龙江省4条主要公路的风吹雪灾害调查数据,对该省公路风吹雪灾害的分布特征进行了分析。结果指出,气候和地形条件,特别是公路路线走向、路基横断面形式以及路基高度对风吹雪灾害的形成具有主导作用。 展开更多
关键词 风吹雪 灾害 公路 黑龙江省
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低矮建筑屋盖风雪流作用场地实测与数值模拟 被引量:11
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作者 赵雷 余志祥 +1 位作者 齐欣 赵世春 《振动与冲击》 EI CSCD 北大核心 2017年第22期225-231,244,共8页
为了研究风雪流对低矮建筑屋盖的作用,制作了6组缩尺模型,在常遇雪天气候下,开展了屋盖积雪特性场地实测与模化分析,考虑了典型的阶梯型屋面以及平屋面、双坡屋面、女儿墙等因素的影响,提出了典型低矮建筑屋盖积雪荷载模化模型。研究表... 为了研究风雪流对低矮建筑屋盖的作用,制作了6组缩尺模型,在常遇雪天气候下,开展了屋盖积雪特性场地实测与模化分析,考虑了典型的阶梯型屋面以及平屋面、双坡屋面、女儿墙等因素的影响,提出了典型低矮建筑屋盖积雪荷载模化模型。研究表明:阶梯型屋面的积雪分布与已有的场地实测及风洞试验结果相似;平屋面雪荷载沿来流方向呈倒U型分布,可模化为均匀分布,但随着风速变化,积雪漂移使积雪形态可能向倒V型演化,建议考虑其线性非均匀分布对结构的不利影响;风速较低时,双坡屋面的积雪漂移量较少,对迎风侧屋盖更不利,国内外规范均侧重考虑了积雪漂移对背风侧的影响,建议考虑弱风条件下积雪漂移对迎风侧的不利影响;女儿墙的存在使屋面积雪量有较大的增加,屋盖前缘和后缘区域的漂移长度差异较大。结合风洞试验与场地实测,考虑雪粒子与风场的双向耦合、雪粒碰撞、黏结,探索性地对阶梯型屋面的积雪分布进行了二维数值模拟,论证了DEM-CFD风雪流模拟方法的可行性。 展开更多
关键词 风雪流 低矮建筑 屋盖结构 场地实测 数值模拟 规范
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公路风吹雪积雪力学原理与积雪深模型 被引量:15
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作者 席建锋 李江 +1 位作者 朱光耀 张贵平 《吉林大学学报(工学版)》 EI CAS CSCD 北大核心 2006年第S2期152-156,共5页
从流体力学原理出发,结合雪害野外观测、风洞实验和数值仿真结果,系统阐释了公路风吹雪积雪原理,并在此基础上,对公路积雪深定量化问题进行了研究,提出了数学模型,并给出了模型的参数标定与求解方法。
关键词 道路工程 积雪机理 积雪深模型 风吹雪
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复杂网络演化博弈理论研究综述 被引量:12
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作者 杨阳 荣智海 李翔 《复杂系统与复杂性科学》 EI CSCD 2008年第4期47-55,共9页
综述复杂网络的结构特性对演化博弈动力学的影响的最新研究成果,研究个体在相互作用和冲突中的策略选择和演化问题,关注自私个体中合作现象的涌现。着重介绍了受到广泛关注的囚徒困境和雪堆博弈两个简单的博弈模型,并利用复杂网络刻画... 综述复杂网络的结构特性对演化博弈动力学的影响的最新研究成果,研究个体在相互作用和冲突中的策略选择和演化问题,关注自私个体中合作现象的涌现。着重介绍了受到广泛关注的囚徒困境和雪堆博弈两个简单的博弈模型,并利用复杂网络刻画了个体间的联系,研究了空间结构与博弈动力学之间的关系,探讨了未来工作的研究方向。 展开更多
关键词 演化博弈理论 复杂网络 囚徒困境 雪堆博弈
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