高校体育专业学生教育模式研究

要做好高校体育专业的学生的思想政治教育与管理工作,必须要了解他们的特点,并研究适合他们专业特点的教育模式和教育方法,才能收到预期的教育效果.“政(政治思想)教(教学)合一的联合模式”是教育与管理的新的形式.     

重庆三大经济区城镇化发展趋势及模式思考

文章通过对重庆市城镇化现状特征与存在问题的分析,总结出在新形势下重庆城镇化进程必将呈现出梯度推进、快速发展的趋势.鉴于此,当前重庆市在引导城镇化发展的进程中,就必须充分利用现有的一切优势条件,根据三大经济区的现有基础,选择切实可行的发展模式,以引导重庆城镇化进程朝着快速、健康、有序的方向发展.     

Energetic Coefficient of Restitution for a Planar Two-Body Oblique Collision with Friction

Although the coefficient of restitution was originally thought to be only a material property, the coefficient of restitution also depends upon initial conditions as well as on the frictional effect for oblique collisions. The objective of this paper is to demonstrate a method for obtaining the coefficient of restitution for oblique collisions and thereby to provide a theoretical guide for collision experiments. In this paper, we derive expressions for the energetic coefficient of restitution ( e* ) based on general normal contact deformation law, by which the value of e* can be obtained according to the initial conditions. An example shows that the results calculated by the derived expressions are reasonable.     

藏东南高寒区尼洋河河谷地带不同土地利用方式土壤抗蚀性研究

土壤抗蚀性是评价土壤侵蚀潜在发生可能性的重要综合性指标,研究高寒河谷地带不同土地利用方式土壤抗蚀性为土地利用模式优化和资源整合提供理论依据.本文应用主成分分析法对藏东南高寒区尼洋河流域5种不同土地利用方式下的3大类、13个土壤抗蚀性指标进行分析研究.研究结果表明:土壤团粒类指标和有机质能很好地反映土壤抗蚀性,0.25 mm水稳性团聚体质量分数、0.5mm水稳性团聚体质量分数、0.25 mm非水稳性团聚体质量分数、水稳性指数、平均重量直径、团聚体结构破坏率、有机质7个指标对土壤抗蚀性的影响最为明显,是表现不同土地利用方式土壤抗蚀性的最佳指标.各抗蚀性指标值基本表现出(0～15)cm(16～30)cm规律.通过建立权重求和模型发现0～15 cm表层土壤抗蚀性能远远大于16～30 cm;最终,通过叠加法得出不同土地利用类型土壤抗蚀性评价从强到弱顺序为:灌木林地(SL)、天然林地(NF)、农耕地(CL)、河滩林地(BL)、人工林地(AF).     

多维极端Reissner-Nordstrm黑洞的熵量子谱

通过似正规模,采用两种量子化方法计算了多维极端Reissner-Nordstrm黑洞的熵量子谱。结果表明,从两种量子化方法所得的熵谱是一致的,此黑洞的熵量子谱与黑洞的参量及微扰场的参量无关,但与时空的维度有关。对于确定的维度,熵量子谱是等间距的。     

‘On the rocks’: reproductive biology of the endemic toad Xanthophryne (Anura: Bufonidae) from the Western Ghats,India

Xanthophryne is a toad genus endemic to the northern Western Ghats of India, with two extant sister species – Xanthophryne koynayensis and Xanthophryne tigerina. Both species are local endemics and endangered. We studied reproductive biology of these toads and found that they are specialized to the lateritic rocky outcrops at mid-elevations in high rainfall areas. Xanthophryne toads have sporadic, multiple spawning bouts lasting 2–4 days during early monsoon. In this explosive breeding behaviour, we observed male toads to engage in ‘pelvic thrusts’, a unique and novel behaviour among anurans. Females oviposit in shallow pools in depressions of lateritic boulders where their tadpoles metamorphose. These ephemeral rocky pools have limited resources and they desiccate rapidly with a break in the rains. To mitigate the stochastic risk of desiccation and subsequent large-scale egg/tadpole mortality, females may disperse their reproductive investment spatially and temporally in multiple clutches, and tadpoles metamorphose rapidly. Here, we describe the amplexus, spawning and male advertisement call, and provide a comparative account of the life history traits of the two Xanthophryne species. These toads face numerous threats and are in need of urgent conservation action. These toads, seemingly well adapted to the isolated rocky outcrops, offer an excellent opportunity to understand endemism, mating systems, anuran ecology and behaviour.     

振型耦合的适应性水平荷载模式对结构POA的影响

适应性水平荷载模式在结构POA(Pushover Analysis)中能够针对结构逐步加深的非弹性性能做出调整,较固定型水平荷载模式能更好地体现实际地震作用.但由于其在分步调整的过程中通常采用SRSS法而未考虑结构阻尼增加引起的振型耦合,所以分析精度较固定型加载模式及Chopra提出的MPA(Modal Pushover Analysis)方法没有优势,影响了适应性水平加载模式的工程应用.文中以两栋高柔体型钢筋混凝土框架为例解释了在结构POA中阻尼系数增加和基本振型滑移的现象;认为在此过程中大幅增加的阻尼加剧了结构振型耦合,所以在高柔结构POA过程中振型耦合不可忽略.提出了一种在POA加载中考虑振型耦合的CQC法适应性水平加载模式,与原有的SRSS法适应性加载模式做了对比,同时给出了适用于工程分析的建议.     

水下核爆作用下混凝土重力坝模型破坏试验

采用落锤冲击模拟水下核爆的一次冲击波对混凝土重力坝的作用.试验遵循弹性-重力联合相似准则,并以冲量相似条件确定冲击摆的质量与悬挂高度.对两种坝体和坝基接触条件,即一种在平滑基底上筑坝,一种在锚固基底上筑坝,开展模型坝的冲击试验,得到模型坝体的动力特性.试验结果表明,坝体破坏模式包括贯穿性断裂、滑移、碎裂、层裂和抛掷等.并初步研究了核爆输入能量和大坝耗散能量之间的平衡关系.     

带电黑洞在 Dirac 场扰动下的似正规模频率

利用三阶WKB近似方法计算了带电黑洞视界周围“dyadosphere”区域的无质量Di-rac场扰动的似正规模频率.从获得的数值结果分析可知,在“dyadosphere”区域里由于引力与非线性电场力的耦合作用,黑洞时空的Dirac微扰场衰减的速度加快.     

小型风光互补发电系统匹配方式的研究

本文在收集选定地点风能和太阳能资源的条件下,根据分析典型牧户负载情况,在保证负载用电需求的条件下,确定合理的风光互补发电系统匹配方式。设计了系统主电路并对系统工况进行分析。通过设计表明,此种系统匹配方式能够满足选定负载的供电需求。