高中地理优质课中的师生对话研究--以“大规模的海水运动”为例     

王文洁  凌敏 《地理教学》2020,(8):18-21

本研究采用"同课异构"的研究思路,从"2015年全国地理教学研究会优质课比赛"获奖的视频课例中选取四节"大规模的海水运动"课作为样本,对四节高中地理优质课中的师生对话进行定性和定量相结合的比较研究。得出研究结论:四节课中师生对话频繁,课堂氛围活跃,但师生对话在认知水平、对话结构、师生话语权等方面存在巨大差异。这些差异将对地理核心素养的落实产生不同影响。  相似文献   

Geophysical flows under location uncertainty,Part I Random transport and general models     

V. Resseguier  E. Mémin  B. Chapron 《地球物理与天体物理流体动力学》2017,111(3):149-176

A stochastic flow representation is considered with the Eulerian velocity decomposed between a smooth large scale component and a rough small-scale turbulent component. The latter is specified as a random field uncorrelated in time. Subsequently, the material derivative is modified and leads to a stochastic version of the material derivative to include a drift correction, an inhomogeneous and anisotropic diffusion, and a multiplicative noise. As derived, this stochastic transport exhibits a remarkable energy conservation property for any realizations. As demonstrated, this pivotal operator further provides elegant means to derive stochastic formulations of classical representations of geophysical flow dynamics.  相似文献   

Geophysical flows under location uncertainty,Part II Quasi-geostrophy and efficient ensemble spreading     

V. Resseguier  E. Mémin  B. Chapron 《地球物理与天体物理流体动力学》2017,111(3):177-208

Models under location uncertainty are derived assuming that a component of the velocity is uncorrelated in time. The material derivative is accordingly modified to include an advection correction, inhomogeneous and anisotropic diffusion terms and a multiplicative noise contribution. In this paper, simplified geophysical dynamics are derived from a Boussinesq model under location uncertainty. Invoking usual scaling approximations and a moderate influence of the subgrid terms, stochastic formulations are obtained for the stratified Quasi-Geostrophy and the Surface Quasi-Geostrophy models. Based on numerical simulations, benefits of the proposed stochastic formalism are demonstrated. A single realization of models under location uncertainty can restore small-scale structures. An ensemble of realizations further helps to assess model error prediction and outperforms perturbed deterministic models by one order of magnitude. Such a high uncertainty quantification skill is of primary interests for assimilation ensemble methods. MATLAB^® code examples are available online.  相似文献   

Seismotectonic studies of the pleistoseist area of the <Emphasis Type="Italic">M</Emphasis> <Subscript> <Emphasis Type="Italic">s</Emphasis> </Subscript> = 6.9 Ilin-Tass earthquake in northeast Yakutia     

L. P. Imaeva  B. M. Koz’min  V. S. Imaev  K. G. Mackey 《Izvestiya Physics of the Solid Earth》2016,52(6):821-835

The complex seismotectonic studies of the pleistoseist area of the Ilin-Tas earthquake (M_s = 6.9), one of the strongest seismic events ever recorded by the regional seismic network in northeastern Russia, are carried out. The structural tectonic position, morphotectonic features of present-day topography, active faults, and types of Cenozoic deformations of the epicentral zone are analyzed. The data of the instrumental observations are summarized, and the manifestations of the strong seismic events in the Yana–Indigirka segment of the Cherskii seismotectonic zone are considered. The explanation is suggested for the dynamical tectonic setting responsible for the Andrei-Tas seismic maximum. This setting is created by the influence of the Kolyma–Omolon indenter, which intrudes into the Cherskii seismotectonic zone from the region of the North American lithospheric plate and forms the main seismogenic structures of the Yana–Indigirka segment in the frontal zone (the Ilin-Tas anticlinorium). The highest seismic potential is noted in the Andrei- Tas block—the focus of the main tectonic impacts from the Kolyma–Omolon superterrane. The general trend of this block coincides with the orientation of the major axis of isoseismal ellipses (azimuth 50°–85°), which were determined from the observations of macroseismic effects on the ground after the Uyandina (M_s = 5.6), Andrei-Tas (M_s = 6.1), and Ilin-Tas (M_s = 6.9) earthquakes.  相似文献   

Phanerozoic within-plate magmatism of North Asia: Absolute paleogeographic reconstructions of the African large low-shear-velocity province     

M. I. Kuz’min  V. V. Yarmolyuk  V. A. Kravchinsky 《Geotectonics》2011,45(6):415-438

The phanerozoic within-plate magmatism of Siberia is reviewed. The large igneous provinces (LIPs) consecutively arising in the Siberian Craton are outlined: the Altai-Sayan LIP, which operated most actively 400–375 Ma ago, the Vilyui LIP, which was formed from the Middle Devonian to the Early Carboniferous, included; the Barguzin-Vitim LIP (305–275 Ma); the Late Paleozoic Rift System of Central Asia (318–250 Ma); the Siberian flood basalt (trap) province and the West Siberian rift system (250–247 Ma); and the East Mongolian-West Transbaikal LIP (230–195 Ma), as well as a number of Late-Mesozoic and Cenozoic rift zones and autonomous volcanic fields formed over the last 160 Ma. The trace-element and isotopic characteristics of the igneous rocks of the above provinces are reviewed; their mantle origin is substantiated and the prevalence of PREMA, EM2, and EM1 mantle magma sources are shown. The paleogeographic reconstructions based on paleomagnetic data assume that the Iceland hot spot was situated beneath the Siberian flood basalts 250 Ma ago and that the mantle plumes retained a relatively stable position irrespective of the movements of the lithospheric plates. At present, the Iceland hot spot occurs near the northern boundary of the African large low shear velocity province (LLSVP). It is suggested that the within-plate Phanerozoic magmatism of Siberia was related to the drift of the continent above the hot spots of the African LLSVP.  相似文献   

二连盆地阿拉达布斯凹陷南洼槽阿尔善组储层特征研究     

周玉娟  高海仁  吕敏  弓虎军 《地下水》2015,(1):191-193

根据岩心、测井、铸体薄片、扫描电镜等多种分析测试资料,对阿尔善组储层岩石学、储集物性及特征进行系统综合研究[1-4]。结果表明:阿尔善组储层岩性主要为岩屑砂岩,其次为岩屑长石砂岩、长石岩屑砂岩,具有成份成熟度、结构成熟度较低的特点,主要是碎屑岩母岩近物源、搬运距离短以及频繁的火山活动综合作用的结果[5];填隙物主要为泥质粘土、胶结物。储层特征主要受沉积作用、成岩作用、构造作用的综合影响[6]。  相似文献   

利用VC++封装MATLAB6.5C++数学库探讨测量平差软件的开发          下载免费PDF全文

袁建东  张耀民 《海洋测绘》2008,28(5):69-72

根据测量数据处理的特点：常常要面对大量的矩阵运算和海量的数据处理，尤其是矩阵的相乘和求逆。通过对vc＋＋6．0和MATLAB6．5特点的分析，探讨了利用Vc＋＋调用MATLAB6．5C／C＋＋数学库快速开发测量平差软件的必要性和可行性，简要地总结和分析了两者联合编程的实现方法。较详细地介绍了作者用VC＋＋调用MATLAB6．5C／C＋＋数学库开发测量平差软件的过程，解决了高程网间接平差的计算。  相似文献   

Sulfoarsenide complexes of gold in hydrothermal solutions in the formation of gold ore deposits (thermodynamic modeling)     

N. V. Vilor  L. A. Kaz’min  N. A. Goryachev 《Doklady Earth Sciences》2014,458(1):1086-1091

The composition and conditions of the formation of gold sulfoarsenide complexes were studied by means of the solution of inverse problems of physicochemical modeling on the basis of the SELEKTOR software, with the computer analysis of the experimental data on Au dissolution in the presence of orpiment at 200–300°C and 1 kbar pressure. It was shown that sulfoarsenide complexes of gold formed in sulfurous-arsenious metalliferous hydrothermal solutions quantitatively prevailed in acidic and near-neutral solutions in the presence of As. The stability of the H₂AuAsS ₃ ⁰ sulfoarsenide complex and of its AuAsS ₂ ⁰ deprotonated analogue depends on the concentration of arsenic in the system, just as the ratio of sulfoarsenide and hydrosulfide complexes of gold. The productive metalliferous generations of sulfides in pyrite-arsenopyrite parageneses are deposited involving gold sulfoarsenides.  相似文献   

基于PowerBuilder的信息系统的权限控制     

罗卫敏 《成都信息工程学院学报》2004,19(2):209-213

针对信息系统安全的考虑,介绍在PowerBuilder环境中对用户权限的具体控制.  相似文献   

活动星系核与类星体中致密天体的形成与并合：伽玛爆发与引力辐射     

王建民 《紫金山天文台台刊》1999,18(3):271-273

频繁的超新星爆发可用以解释活动星系核与类星体的超高金属丰度。星团中的恒星与吸积盘相互作用导致致密天体中子星和黑洞的形成率很高,这些致密天体与红巨星很容易形成双星系统,而后形成（ＮＳ／ＢＨ,ＮＳ／ＢＨ） 双星由于引力辐射最终导致并合而形成伽玛射线爆发。我们估计了伽玛射线爆的爆发频率,发现与观测相符。  相似文献