基于循环经济的"农家乐"旅游思考

发展循环经济是实施可持续发展战略的重要途径,文章结合循环经济理论与“农家乐”旅游在可持续发展中面临的问题,探讨了循环经济对“农家乐”旅游可持续发展的作用,提出了运用循环经济促进我国“农家乐”旅游可持续发展的具体措施。     

用数码技术研究抛射体的运动规律

利用数码相机拍摄小球运动的短片,利用Premiere,Photoshop和Excel等计算机软件合成轨迹图、处理数据和拟合运动曲线,从而探索抛射体的运动规律,并求得重力加速度值。最后分析了表差法处理结果的不确定度。     

环上六质点系统的内部振动

用直接求解微分的方程的方法,分析了一维环上六个全同质点系统的简正模问题,得到了比现有文献结果更多的一些新的内部振动模式     

Bifurcation analysis of a microcantilever in AFM system

The atomic force microscope system (AFM) has become a popular and useful instrument to measure the intermolecular forces with atomic resolution that can be applied in electronics, biological analysis, materials, semiconductors, etc. This paper studies the bifurcation phenomenon and complex nonlinear dynamic behavior of the probe tip between the sample and microcantilever of an atomic force microscope using the differential transformation method. The dynamic behavior of the probe tip is characterized with reference to bifurcation diagrams, phase portraits, power spectra, Poincaré maps, and maximum Lyapunov exponent plots produced using the time-series data obtained from differential transformation method. The results indicate that the probe tip behavior is significantly dependent on the magnitude of the vibrational amplitude. Specifically, the probe tip motion changes from T-periodic to 3T-periodic, then from 6T-periodic to multi-periodic, and finally to chaotic motion with windows of periodic motion as the vibrational amplitude is increased from 0 to 5.0. Furthermore, it is demonstrated that the differential transformation method is in good agreement for the considered system.     

基于隐患因素的矿业城市生态安全评价研究

本文针对矿业城市中各种灾害因素对生态安全的威胁和影响,从生态隐患视角提出生态安全是隐患因素触发概率、损失度和响应能力的函数,并依据隐患因素触发的空间,从大气圈、水圈、岩石圈、生物圈以及人类活动圈层角度,初步确定基于五大圈层结构的生态安全评价指标体系.利用风险度量与模糊优选理论,提出矿业城市生态安全模糊循环迭代评价模型,并同时可以得到方案隶属度和目标权重,最后将其应用于辽宁省矿业城市生态安全评价中.结果表明,铁法市、抚顺市、阜新市、本溪市和鞍山市生态安全性指数较低,均在0.5以下,且为煤炭一冶金型矿业城市,由于经济的高速发展而带来的资源短缺以及采矿活动造成的环境污染和生态破坏造成了生态安全的巨大压力;葫芦岛市、清原县、瓦房店市、宽句县和凤城市等生态安全性指数较高,其矿业生产涉及有色金属和化工等行业,矿产资源开采量较小,生态安全隐患的影响也较小.该模型科学、实用,为解决矿业城市在决策信息不完全确知情况下的生态安全评价问题提供了理论和途径.     

菊三七对运动性骨折治疗作用的研究

笔者应用X线观察、生物力学测定、生物化学测定及病理检查等方法相结合 ,对中医“跌打损伤”治疗中药菊三七的水提物进行了抗实验性骨折作用的研究 ,结果表明 :菊三七水提物具有较好的促进骨折愈合作用 ,其作用机制与其加速骨的钙、磷代谢有关。     

Contextual factors on physical demands in professional women’s soccer: Female Athletes in Motion study

The aim of this study was to examine the impact of contextual factors on relative locomotor and metabolic power distances during professional female soccer matches. Twenty-eight players (forwards, n?=?4; midfielders, n?=?12; defenders, n?=?12) that competed in a 90-min home and away match (regular season only). The generalised estimating equations (GEE) was used to evaluate relative locomotor and metabolic power distances for three contextual factors: location (home vs. away), type of turf (natural vs. artificial), and match outcome (win, loss and draw). No differences were observed for home vs. away matches. Moderate-intensity running (20.0?±?1.0?m?min^?1 and 16.4?±?0.9?m?min^?1), high-intensity running (8.6?±?0.4?m?min^?1 and 7.3?±?0.4?m?min^?1) and high-metabolic power (16.3?±?0.5?m?min^?1 and 14.4?±?0.5?m?min^?1) distances were elevated on artificial turf compared to natural grass, respectively. Relative sprint distance was greater during losses compared with draws (4.3?±?0.4?m?min^?1 and 3.4?±?0.3?m?min^?1). Overall physical demands of professional women’s soccer were not impacted by match location. However, the elevation of moderate and high-intensity demands while playing on artificial turf may have implications on match preparations as well as recovery strategies.     

“‘科学有曰’之再现经典实验:比萨斜塔实验”教案

本教案以“比萨斜塔实验”为素材,将“科学思维”与“探究实践”的科学方法及相应的科学思想作为重点,以“像科学家探究科学一样学习科学”为教学理念,在“5E教学法”的基础上强化了二次“探究—解释”,以探究式学习与情境教学为主要教学方法,以动手实验、交流讨论、角色扮演相结合的活动形式,引导学生进行“质疑→思辨→实证”的科学探究,实现“具象→抽象”的科学认知,初步了解和运用“思辨的科学”与“实证的科学”。     

打造两型城市 实现产业升级——安徽（淮南）现代煤化工产业园规划项目结构与循环经济分析

淮南市是资源型城市,发展现代煤化工产业是淮南市实现产业升级、城市转型重要途径。本文从循环经济的框架模式入手,着重阐释了循环经济实施的措施：一是减量化;二是再利用;三是资源化;四是技术集成;五是信息共享;六是设施共享。在技术集成中重点介绍了洁净煤气化技术、合成气净化技术、高效合成技术、醋酸甲酯制醋酐技术、大型捣固焦生产技术、干法乙炔生产技术、高强高模PVA纤维生产技术和工业水利用技术。最后,对产业结构环境合理性提出了建议。     

体操动作“结构-时间-空间”辩证关系在教学中的应用

运用文献法、调查法和逻辑思辩法等探讨体操动作结构-时间-空间的辩证关系,从不同的侧面论述体操动作的难度价值和审美价值以及提高体操动作价值品级的基本手段和规律。经过研究发现,只有恰当理解和运用动作“结构-时间-空间”蕴涵的辩证关系,才能提高体操技术教学质量,促进教学发展。