一个含三次多项式的非线性偏微分方程的孤立波   总被引：1，自引：1，他引：0  

谢绍龙  洪晓春 《玉溪师范学院学报》2004,20(8):6-10

用动力系统分支方法研究了含三次多项式的非线性方程un -c20 uxx u3 αu2 βu-γ=0 .给出了参数空间的划分 ,在各种参数条件下得到了孤立波的个数 .  相似文献   

个人隔网对抗性项群年度训练周期特征   总被引：2，自引：0，他引：2  

郑晓鸿 《首都体育学院学报》2003,15(2):20-23

本文运用调查、访问，个案分析等方法对个人隔网对抗性项群高水平运动员的年度参赛次数及运动成绩变化、年度训练内容安排、年度运动负荷变化趋势进行了研究。揭示出了高水平个人隔网对抗性项群运动员年度训练周期的相关特征。  相似文献   

How Persuasive Are Health Advertisements in First-Person Shooter Games? Exploring Knowledge-Activation and Thought-Disruption Mechanisms     

Jorge Peña  Subuhi Khan  Christopher N. Burrows  Hart Blanton 《Communication Research Reports》2018,35(4):293-302

This study examined whether persuasive health messages embedded in shooter games have broad or targeted effects on players’ willingness to engage in risk behaviors (N = 145). Participants presented with in-game health messages discouraging alcohol-impaired driving of motor vehicles showed reduced willingness to drink alcohol and to operate both motor and nonmotor vehicles, compared to those in a no-message gaming control condition. There were no spillover effects on willingness to smoke cigarettes or marijuana, thus implying targeted persuasive effects. In addition, players experiencing high instead of low cognitive load showed decreased postexperiment willingness to drink and operate nonmotor vehicles, thus suggesting that playing a game under high cognitive load can influence players’ attitudes. The findings replicate previous research and further expand on knowledge-activation and thought-disruption mechanisms underlying the persuasiveness of health messages.  相似文献   

儿童认知策略的发展特点   总被引：1，自引：0，他引：1  

吴雪梅  黄爽  李西营 《成都教育学院学报》2005,19(11):40-42,112

认知策略是个体在解决问题的过程中,运用已有的知识和经验,以期达到目的的智力活动.认知策略的层次性使得其分类方式交叉重叠.儿童认知策略的发展具有以下特征:随着年龄的增长儿童开始产生策略,进而自发使用这些策略,策略使用的有效性也在增加.许多实证研究表明,西格勒的重叠波浪模型符合儿童认知策略发展的特点.  相似文献   

Modeling of D-STATCOM in distribution systems load flow   总被引：1，自引：0，他引：1  

HOSSEINI Mehdi SHAYANFAR Heidar Ali FOTUHI-FIRUZABAD Mahmud 《浙江大学学报(A卷英文版)》2007,8(10):1532-1542

This paper presents modeling of Distribution STATCOM (D-STATCOM) in load flow calculations for the steady- state voltage compensation. An accurate model for D-STATCOM is derived to use in load flow calculations. The rating of this device as well as the direction of required reactive power injection for voltage compensation in the desired value (1 p.u.) is de- rived and discussed analytically and mathematically by the phasor diagram method. Furthermore, an efficient method for node and line identification used in load flow calculations is presented. The validity of the proposed model is examined by using two standard distribution systems consisting of 33 and 69 nodes, respectively. The best location of D-STATCOM for under voltage problem mitigation approach in the distribution networks is determined. The results validate the proposed model for D- STATCOM in large distribution systems.  相似文献   

低强度循环载荷训练对髌骨髌腱结合部损伤和髌骨微细结构的影响     

王博  王琳 《成都体育学院学报》2016,(2):88-92

目的：：本研究利用循环载荷动物模型,比较休息和低强度运动对髌骨髌腱结合部( patella－patella tendon junction, PPTJ)损伤及对髌骨的影响。实验方法：12只成年雌性新西兰大白兔,随机筛选分组分为4周循环载荷组(LD－RST,n=6),8周循环载荷组(LD－LI,n=6),左后肢进行实验,右后肢为空白对照。实验过程中,前4周两组实验动物统一接受强度为7.17N／S共24小时的循环载荷。在实验的第4周后,LD－RST组停止实验,LD－LI组将强度改为4.2N／共24小时的循环载荷。8周后所有动物统一进行取材,将取材后组织进行Micro－CT进行并进行H&E染色,使用图像采集系统进行组织学分析。结果：H&E染色测量纤维软骨带厚度LD－LI组和LD－RST组没有显著差异,LD－LI组的胶原排列比LD－RST组更加紧密整齐。骨量和骨小梁结果显示实验组和对照组没有显著差异。结论：4周休息不能促进髌腱结合部损伤的恢复。4周低强度的循环载荷没有加重损伤和髌骨增生,并且对肌腱的重建修复具有促进作用。  相似文献   

Rajnikant in Japan: Indian “superstardom” and low value markets     

S.V. Srinivas 《Inter-Asia Cultural Studies》2013,14(4):615-634

This paper draws attention to some questions thrown up by the increased circulation of mass-produced cultural commodities sourced from Asia in the relatively new markets of the region. Juxtaposing the short-lived success of the Indian star Rajnikant in Japan in the late 1990s and the unsuccessful attempt to promote Korean films in the Indian theatrical circuits a decade later, the paper argues that in spite of their considerable differences both instances foreground the difficulties cultural industries of Asia have in generating revenues in the region's markets. The paper goes on to elaborate on a model of stardom, exemplified by Rajnikant, which has evolved as a direct response to the challenges posed by low value markets.  相似文献   

妇女健身活动的心血管反应     

魏杭庆  陈革新 《浙江体育科学》1998,(3)

对１７３名中老年妇女进行的五种健身项目活动前后的生理指标测试。结果显示：１、中老年迪斯科和腰鼓活动后能明显改善全面粘度、心指数、左心有效泵力和有效血容量。２、太极拳和木兰拳、交谊舞对微循环半更新时有明显改善。  相似文献   

Korean-Wave celebrities between global capital and regional nationalisms     

Olga Fedorenko 《Inter-Asia Cultural Studies》2017,18(4):498-517

This article examines conflicts over the transnationalization of South Korean celebrities in the wake of the Korean Wave (Hallyu) in the twenty-first century. I consider a number of celebrity controversies to argue that the demands placed upon Hallyu celebrities by domestic observers, foreign audiences, and global capital are fundamentally irreconcilable. South Korean nationalist appropriation of Hallyu, as well as the local celebrity culture, demand that Hallyu stars firstly be exemplary Korean patriots, whereas international audiences expect sympathy for their own causes. Local nationalist agendas have proven particularly troublesome because of postcolonial sensibilities and ongoing territorial disagreements between South Korea and its neighbors. Finally, as circulating commodities and commercial assets, Hallyu stars are also pledged to global capital. Their value is highest when they appeal to as broad an audience as possible and alienate no one with their politics. An apolitical neutrality on regionally controversial issues, however, is an untenable position when antagonistic geopolitical interests are concerned and nationalist passions flare. I situate this argument within critical scholarship on cultural globalization flows within Asia, while engaging celebrity studies to frame Hallyu stars as transnational commodities.  相似文献   

二极管半波整流调节负载功率释疑     

YANG Tai-hua 《湖南民族职业学院学报》2007,(3)

对电热毯、电熨斗等电热器具节电问题进行了讨论,纠正了二极管半波整流调节负载功率的有关错误说法。  相似文献