共查询到20条相似文献，搜索用时 31 毫秒
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李永福 《湖州师范学院学报》1990,(5)
双曲空H~3在Weierstrass坐标下的运动群就是Lorentz群G,最近,我们确定了G的各类Lie子群,本文则集中讨论G的2参数Lie予群H在H~3上作用的轨道,主要结果如下:定理1 Lorentz群G的2参数Lie子群H在双曲空间H~3上作用的轨道,或者是圆柱面,或者是非正常曲率的全脐点曲面,反之亦然.定理2 Lorentz群G的每个2参数Lie子群H在双曲空间H~3上作用所得的不同轨道,彼此测地平行. 相似文献
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杨柯金 《南阳师范学院学报》2002,1(6):106-107,122
以哥白尼的日心说为理论基础把太阳置于宇宙中心，地内行星、地球和地外行星以椭圆轨道自西向东绕日运转，把天球套合在其外围，按行星和地球运动速度差异确定行星和地球绕转过程中在轨道上的相关位置，根据行星运动方向和太阳周年视运动的方向，清楚定义了东西大距和东西方照。根据行星和太阳在天球上的投影及运动的连续性解释行星的顺逆行和留。按照行星和太阳的角距离解释行星的出没规律。 相似文献
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具有强specification性质的连续流,其周期轨所生成的不变测度的集合是不变测度空间内的稠密集合. 相似文献
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飞船跟踪测控中的球面区域覆盖 总被引：1，自引：0，他引：1
朱文辉 《南通职业大学学报》2010,24(1):64-66
飞船绕地球飞行,因地球自转,其飞行轨迹呈网状分布于运行球面的某个区域,需用多个测控站的测控区域予以全域覆盖．以实现全程跟踪测控。为此建立了测控圆的立体角计算公式和测控圆的经纬度方程,设计出无空隙的多层覆盖方案及精确计算覆盖纬度的公式。以神州7号的数据为例。给出了测控站数目最少的、能达到全域覆盖的最优方案,并对最优性进行了论证。 相似文献
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Linda Henderson Joce Nuttall Lili-Ann Kriegler Helen Schiele 《Teachers and Teaching》2016,22(6):716-728
This paper undertakes a spatial examination of the early childhood–school relational space. It theorizes space as a product of interrelationships, moving therefore beyond an understanding of space as fixed and horizontal. Drawing on data from a pilot project with early childhood and junior primary teachers working in an independent (i.e. private, fee-paying) school, the experience of meeting across the early childhood–school divide is examined. We ask how space is produced and what types of relationships emerge in its production. The paper concludes by arguing that the production of open and dynamic spatial arrangements is key to creating new ways of being in relationship across the early childhood–school divide. 相似文献
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Jennifer Rowsell Mark Shillitoe 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(4):1544-1559
The idea of making as a form of activism or, as we refer to it in this paper, craftivism, underpins our ambition to transform pedagogical environments into spaces of possibility through sensory and affective making practices. A craftivist agenda pushes for open teaching and learning with materials so that students can inhabit a what if space which ruptures institutional time and space. Beginning with a theorization of disruptive making and dissensus and then moving on to foreground a materialist stance on making, the paper illustrates how students experience materialities across two very different classroom environments and how these experiences led to greater presence, voice and agency for students. There is an underlying focus in the paper on embodied responses and affective flows. After theorizing craftivism, there are three sections that explore making, teaching and feeling through craftivist, postdigital methods. 相似文献
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王少杰 《邵阳学院学报(社会科学版)》2002,(2)
现在的计算机硬盘容量比较大,而且都采用LBA模式,该模式会造成硬盘空间一定的丢失,本文论述在DOS6.x或DOS7.0运行环境下,利用汇编语言设计程序,以充分开发利用闲置的硬盘空间. 相似文献
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CAO Juan WANG Guo-zhao 《浙江大学学报(A卷英文版)》2007,8(10):1663-1670
As three control points are fixed and the fourth control point varies, the planar cubic C-curve may take on a loop, a cusp, or zero to two inflection points, depending on the position of the moving point. The plane can, therefore, be partitioned into regions labelled according to the characterization of the curve when the fourth point is in each region. This partitioned plane is called a "characterization diagram". By moving one of the control points but fixing the rest, one can induce different characterization diagrams. In this paper, we investigate the relation among all different characterization diagrams of cubic C-curves based on the singularity conditions proposed by Yang and Wang (2004). We conclude that, no matter what the C-curve type is or which control point varies, the characterization diagrams can be obtained by cutting a common 3D characterization space with a corresponding plane. 相似文献
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运用原子簇化合物键价计算公式,对元件合成钼铁硫簇合物轨道分布情况进行分析.无论是低核簇还是高核簇都具有M-M金属键,又具有单电子占据轨道和孤对电子占据轨道.在合成过程中,各种变化轨道都转化成为M-M金属键. 相似文献
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引入随机序列滑动似然比作为整值随机变量序列相对于服从负二项分布的独立随机变量序列的偏差的一种随机性度量,通过滑动相对熵限定了样本空间的一个子集．在此子集上得到了一类关于任意整值随机变量序列的用不等式表示的定理．即强偏差定理． 相似文献
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欲望搬迁原理下惠安城区生活空间质量评价 总被引：1，自引：1，他引：0
曾献君 《福建工程学院学报》2011,9(1):40-45
以滨海小城市惠安城区为例,从城市社会空间结构和城市生活空间结构的相关理念着手,分析出城市生活空间质量不断受到关注和欲望搬迁原理评价生活空间质量的人本真实性;阐述了案例区的基本概况、社区发展过程并对社区进行划分;基于欲望搬迁原理对其城市内部居住生活空间质量进行人本综合评价与分析,将惠安城区的居住生活空间质量分成4个等级。 相似文献
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身体移动、性别政治与上海都市新空间的开创——以陆士谔《十尾龟》为例 总被引：1，自引：0，他引：1
刘保庆 《南京师范大学文学院学报》2012,(1):121-126
近代上海女性的身体移动空间范围和移动方式决定了女性摆脱传统封建文化约束的自由度。晚清小说家陆士谔的《十尾龟》对上海妓女的描绘显得独特而有新意。在上海这个流动性和开放性空间中,映捷的身体移动方式把上海妓女和家庭妇女勾连在一起,使她们对女性身体产生新的感知和体验,让她们认识到追求自身欲望的合理性和可能性。这种女性觉醒意识的出现离不开上海这个流动性空间。 相似文献
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A closed-form out-of-plane dynamic displacement response of a curved track subjected to moving loads was pro- posed. The track structure was modeled as a planar curved Timoshenko beam periodically supported by the double-layer spring-damping elements. The general dynamic displacement response induced by the moving loads along the curve on the elastic semi-infinite space was firstly obtained in the frequency domain, according to the Duhamel integral and the dynamic reciprocity theorem. In the case of the periodic curved track structure subjected to moving loads, the dynamic displacement equation was simplified into a form of summation within the basic track cell instead of the integral. The transfer function for the curved track was expressed in the form of a transfer matrix. Single and series moving loads were involved in the calculation program. For the verification of the analytical model, the mid-span vertical deflection of a simply support curved beam subjected to moving load was recalculated and compared with the same case in the reference. The research results indicate that： under the same moving loads, the displacement response of the curved track decreases slightly with the increasing track radius, and the displacement response of the curved track with the radius greater than or equal to 600 m is almost equivalent to the displacement response of the straight track; the frequency spectrum of the curved track is more abundant than that of the straight track, which may result in more wheel-rail resonance and rail corrugation in the curved lines. 相似文献
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弯曲空间量子场中的一种运动镜模型可用于等效描述黑洞视界外的物理并使其物理过程及相应解释得以简化。本文在给出一特定的运动镜轨迹后将黑洞视界外的史瓦西空时流形与运动镜的空时流形进行了比较,得出两种结构在视界外空时区域完全相同。 相似文献
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阴阳学说与中国人的宇宙观 总被引：1，自引：0，他引：1
侯宏堂 《安徽师范大学学报(人文社会科学版)》2003,31(1):62-69
中国人的传统宇宙观可以剖析为四个层面,即源于混沌观、气化生生观、有机整体观和时空合一观,而这些观念无一不与"阴阳"紧密相关。阴阳学说是中国人传统宇宙观的哲学根基。 相似文献
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张薇 《绵阳师范学院学报》2012,(4):116-118
近年来,多部电影使用封闭空间的叙事手法,表达一个又一个的动人故事。最近上映的《金陵十三钗》就是运用这种封闭空间的叙述策略,把不同的元素吸纳到一个封闭的地理空间中,从互相矛盾的个体逐渐变为一个整体,从而以不同的姿态走出封闭空间的束缚。这种外在空间以及外在空间所象征的精神空间是电影带给我们的直观感受和深度思考。 相似文献