俄钢铁大桥神秘起舞

众所周知,俄罗斯的伏尔加河是欧洲最长的河流,蕴藏着俄罗斯文化,当然也出现不少神秘传说,在它的源头梅德韦季察丘陵,屡屡出现奇特的现象。有专家分析,俄罗斯出现的幽浮,竟然都会穿越这个地方,还有当地的夏天都会有规律的球形闪电飞来飞去,实在很诡异。据报道,2010年俄罗斯南部伏尔加河大桥发生波浪状的离奇摇晃,当时好几辆正行驶在桥上的车子,也跟着不断滚动,景     

植物节律

植物节律广泛存在于生物界，是生命科学的重大基础理论问题。植物分子生物学技术、显微技术及应用数学等技术的发展，为外界信号及生物钟对节律基因表达调控提供了新的研究手段。本书回顾了近年来植物近昼夜节律、次昼夜节律分子机制相关研究所取得的进展，并描述了植物的生长、发育、对周围环境的应激性反应等生理现象。     

会“跳舞”的摩天大楼

看过芭蕾舞剧的人肯定会对舞者单脚着地旋转的优美舞姿印象深刻，但如果告诉你说一栋摩天大楼也会这手“绝活”，你会相信吗？     

A study of psychological characteristics of modern dance and latin dance

Ａｓｔｕｄｙｏｆｐｓｙｃｈｏｌｏｇｉｃａｌｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｍｏｄｅｒｎｄａｎｃｅａｎｄｌａｔｉｎｄａｎｃｅ￥ＺｈｏｎｇＮｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭｕｓｉｃａｌＥｄｕｃａｔｉｏｎ，ＳｏｕｔｈｗｅｓｔＣｈｉｎａＮｏｒｍａｌＵｎｉ...     

An auroral flare at Jupiter

Jupiter's aurora is the most powerful in the Solar System. It is powered largely by energy extracted from planetary rotation, although there seems also to be a contribution from the solar wind. This contrasts with Earth's aurora, which is generated through the interaction of the solar wind with the magnetosphere. The major features of Jupiter's aurora (based on far-ultraviolet, near-infrared and visible-wavelength observations) include a main oval that generally corotates with the planet and a region of patchy, diffuse emission inside the oval on Jupiter's dusk side. Here we report the discovery of a rapidly evolving, very bright and localized emission poleward of the northern main oval, in a region connected magnetically to Jupiter's outer magnetosphere. The intensity of the emission increased by a factor of 30 within 70 s, and then decreased on a similar timescale, all captured during a single four-minute exposure. This type of flaring emission has not previously been reported for Jupiter (similar, but smaller, transient events have been observed at Earth), and it may be related directly to changes in the solar wind.     

The auroral footprint of Enceladus on Saturn

Although there are substantial differences between the magnetospheres of Jupiter and Saturn, it has been suggested that cryovolcanic activity at Enceladus could lead to electrodynamic coupling between Enceladus and Saturn like that which links Jupiter with Io, Europa and Ganymede. Powerful field-aligned electron beams associated with the Io-Jupiter coupling, for example, create an auroral footprint in Jupiter's ionosphere. Auroral ultraviolet emission associated with Enceladus-Saturn coupling is anticipated to be just a few tenths of a kilorayleigh (ref. 12), about an order of magnitude dimmer than Io's footprint and below the observable threshold, consistent with its non-detection. Here we report the detection of magnetic-field-aligned ion and electron beams (offset several moon radii downstream from Enceladus) with sufficient power to stimulate detectable aurora, and the subsequent discovery of Enceladus-associated aurora in a few per cent of the scans of the moon's footprint. The footprint varies in emission magnitude more than can plausibly be explained by changes in magnetospheric parameters--and as such is probably indicative of variable plume activity.     

Anti-planetward auroral electron beams at Saturn

Strong discrete aurorae on Earth are excited by electrons, which are accelerated along magnetic field lines towards the planet. Surprisingly, electrons accelerated in the opposite direction have been recently observed. The mechanisms and significance of this anti-earthward acceleration are highly uncertain because only earthward acceleration was traditionally considered, and observations remain limited. It is also unclear whether upward acceleration of the electrons is a necessary part of the auroral process or simply a special feature of Earth's complex space environment. Here we report anti-planetward acceleration of electron beams in Saturn's magnetosphere along field lines that statistically map into regions of aurora. The energy spectrum of these beams is qualitatively similar to the ones observed at Earth, and the energy fluxes in the observed beams are comparable with the energies required to excite Saturn's aurora. These beams, along with the observations at Earth and the barely understood electron beams in Jupiter's magnetosphere, demonstrate that anti-planetward acceleration is a universal feature of aurorae. The energy contained in the beams shows that upward acceleration is an essential part of the overall auroral process.     

控制轧制节奏的优化

针对单机架中厚板轧制过程中,不同轧制及控制轧制方式下轧机的利用率等问题进行分析.在一组组板坯轧制生产方式的基础上,提出了板坯交替轧制的生产方式,并在此基础上,进一步研究了根据不同的轧制时间、待温时间等条件优化控制轧制节奏的方法.该方法可以有效地提高中厚板轧机的利用率.     

中国民间舞的价值取向

中国民间舞蹈来源于民间，是民间传统文化的一种流传形式。民间舞蹈的价值取向大体上体现在它的生命价值和社会价值。这种简洁、明朗的艺术，能缓解人身心的疲惫，满足人们对简朴稚拙的美学形态的渴求，使人达到心理和生理上的平衡，因而仍然赢得人们对民间舞蹈艺术的青睐。     

普通高校开展龙狮运动探析——以韶关学院开展龙狮运动为例

舞龙舞狮运动是民族传统体育项目之一,有着悠久的历史和灿烂的文化,在众多开设龙狮课程的院校中,韶关学院龙狮运动尚属于起步阶段,在相关的理论研究及训练上还存在着一定的差距,结合目前韶关学院龙狮运动开展的现状以及理论构建进行分析,以期为龙狮运动的进一步开展和提高提供参考.     

论体育舞蹈艺术性特征

运用文献资料法和逻辑分析法对体育舞蹈的艺术性特征进行探析。探讨体育舞蹈项目的一般性和独特性的艺术特征。以期对体育舞蹈艺术性的表现形成一个共识,有利于体育舞蹈的更长远发展。     

Solar cycle dependence of the seasonal variation of auroral hemispheric power

Although much has been done on the hemispheric asymmetry (or seasonal variations) of auroral hemispheric power (HP), the dependence of HP hemispheric asymmetry on solar cycle has not yet been studied. We have analyzed data during 1979–2010 and investigated the dependence of HP hemispheric asymmetry/seasonal variation for the whole solar cycle. Here we show that (1) the hemispheric asymmetry of HP is positively correlated to the value of solar F10.7 with some time delay; (2) it is closely related to the coupling function between the solar wind and magnetosphere; and (3) the winter hemisphere receives more auroral power than the summer hemisphere for K _p～0 to 6. The statistic results can be partly understood in the framework of the ionospheric conductivity feedback model. The similarity and differences between our results and previous results are discussed in the paper.     

浅谈体育舞蹈的意境创造

运用美学、体育学、舞蹈艺术理论,采用文献资料研究法、访谈法对体育舞蹈的意境创造过程进行了探索,提出创造意境大致应从"写境"和"造境"两个方面入手,重视意境构成的各个元素的功能,遵循艺术规律,为高品位体育舞蹈的创编提供帮助.     

体育舞蹈教学中影响学生学习效果因子的分析

体育舞蹈作为一项新兴的体育项目,在教学领域的研究尚处于较为局限的状态,从体育舞蹈教学实践出发,通过调查分析,运用现代科学技术和手段来寻找影响目前学生学习效果的诸因素。     

浅谈幼师专业的舞蹈教学

幼师专业舞蹈教学中存在任务重、时间少和学生素质差等不利因素。搞好幼师舞蹈教学的关键在于要抓住重点，明确基本功训练、民族民间舞教学和儿童舞蹈教学三者之间的关系。     

Scattering by chorus waves as the dominant cause of diffuse auroral precipitation

Earth's diffuse aurora occurs over a broad latitude range and is primarily caused by the precipitation of low-energy (0.1-30-keV) electrons originating in the central plasma sheet, which is the source region for hot electrons in the nightside outer magnetosphere. Although generally not visible, the diffuse auroral precipitation provides the main source of energy for the high-latitude nightside upper atmosphere, leading to enhanced ionization and chemical changes. Previous theoretical studies have indicated that two distinct classes of magnetospheric plasma wave, electrostatic electron cyclotron harmonic waves and whistler-mode chorus waves, could be responsible for the electron scattering that leads to diffuse auroral precipitation, but it has hitherto not been possible to determine which is the more important. Here we report an analysis of satellite wave data and Fokker-Planck diffusion calculations which reveals that scattering by chorus is the dominant cause of the most intense diffuse auroral precipitation. This resolves a long-standing controversy. Furthermore, scattering by chorus can remove most electrons as they drift around Earth's magnetosphere, leading to the development of observed pancake distributions, and can account for the global morphology of the diffuse aurora.