Modelling Evolution of Bed Profile and Grain Size Distribution in Unsurveyed Rivers

The water flow and sediment transport equations have been linearized and analytically solved under the hypothesis of quasi-equilibrium conditions. This solution permits to reconstruct the river bathymetry from planimetric data, the only ones available from satellite images for most of the large rivers of the world. The linearized quasi-equilibrium solution provides a criterion to evaluate the accuracy of the approximate （uniform-flow） model, compared to the regular （steady-flow） model. For non-equilibrium conditions, a further constraint on time resolution should be added, which is however generally satisfied for long-term morphological simulations. The uniform-flow solution presents many advantages which become crucial for long-term numerical computations at watershed scale. The article provides a detailed numerical comparison of the accuracy and resolution of both steady- and uniform-flow models, with an application to the evolution of the lower Zambezi River, which confirms the theoretical criterion. The accuracy of the uniform-flow solution appears to improve when the river is schematized with a coarse computational grid although, of course, with a corresponding loss of spatial resolution.     

空间飞行器远尾区内等离子体与场的相互作用

从理论上得到一组在考虑非静态极限下描述空间飞行器远尾区内等离子体与场之间的非稳态非线性相互作用耦合方程，并对其进行数值解，通过来用数值模拟计算方法，表明由于高频包络场的调制不稳定性，会产生密度空腔和电磁孤波，这对探测隐身飞行器有很重要的意义．     

月壤中纳米金属铁的太空风化成因及模拟方法分析

月壤中普遍存在着大量由太空风化作用产生的纳米金属铁,这些纳米金属铁在一定程度上改变了月球表面的物理、化学和光学特征.纳米金属铁在月壤中主要赋存于胶结质玻璃相中和月壤颗粒的表面,胶结质玻璃相的纳米金属铁起源于微陨石轰击富含太阳风氢粒子的月壤产生的高温熔融还原作用,颗粒表面的纳米金属铁来自微陨石轰击引起的蒸发沉积作用和太阳...     

Stories of space and subjectivity in planning the Multimedia Super Corridor

The Malaysian government has embarked on an ambitious refashioning of the nation called Vision 2020 in pursuit of its goal of becoming a ‘developed country’. A pivotal component of this ‘vision’ is the planning and provision of information technology (IT) infrastructure in a multi-billion dollar urban mega-project called the Multimedia Super Corridor (MSC). The purpose of my paper is twofold. First, I situate an official planning document for the MSC entitled Physical Design Guidelines for the Multimedia Super Corridor in the activity of transnational planning practice. Second, I argue that a thematic series of organizing planning concepts and practices can be identified in this document. These concepts and practices work in two ways: first, by representing highly positioned notions of sub-urban, middle-class urban design conventional in specific North American cities as universally applicable to, and desirable for, the broader national development goals the MSC is intended to lead; second, by creating a ‘total image’ for the MSC that suggests an apparently seamless relationship between the MSC and the proper citizens for it at every imaginable scale. One important effect of these plans is the material transformation of a rural landscape of and for production into an urban landscape of and for consumption. This transformation raises the question of who can belong to the ‘nation’ being (re)imagined via the MSC.     

山地旅游区气候舒适度的时空特征分析

本文以浙江省仙居县多年气象资料为基础,对气温作了短序列订正,结合GPS的定位资料和仙居县1∶1万数字高程模型对气温作了空间推算。在此基础上,结合相对湿度和风速,完成了仙居县的气候舒适度空间分布图,同时结合DEM的高程分级资料,统计各代表月份地形舒适区域分布面积,分析了空间分布特征。结果表明,在时间分布上,5—10月,气候舒适;在空间分布上,以7月为例,舒适区域主要集中分布于丘陵和低山。     

Body politics and spaces of drug addiction in Darren Aronofsky’s <Emphasis Type="Italic">Requiem for a Dream</Emphasis>

Through a critical analysis of Darren Aronofsky’s filmic adaptation of Hubert Selby’s Jr.’s Requiem for a Dream (2000), this article explores different relational understandings of drug using bodies and spaces of addiction. In an attempt to move away from modernist readings of addiction I look to different relational and ethical understandings of bodies and assemblages offered in the work of Gilles Deleuze and Felix Guattari. By approaching the subject of drug addiction through the film and Deleuzian–Guattarian philosophy, this article presents different insights and alternative political and ethical imaginaries of what drug bodies and spaces are and do.     

地图学新产品与人类空间认知能力变革

地图是人类空间认知能力的图形化表述,地图如实地记载了人类思维发展的历程。同时人类的空间认知能力也随着地图学新产品的深入开发与普及应用不断地发生着巨大的变革,这是一个相互促进、相辅相成的过程。本文将从四组关键词的角度:1)现实空间、思维空问、虚拟空间;2)抽象思维、形象思维、创造思维;3)空间、时间;4)显性知识、缄默知识(意会知识),详细探讨地图学新产品对人类空间认知能力的重要影响。     

“Galileo Galilei” (GG) a small satellite to test the equivalence principle of Galileo, Newton and Einstein

“Galileo Galilei” (GG) is a small satellite designed to fly in low Earth orbit with the goal of testing the Equivalence Principle—which is at the basis of the General Theory of Relativity—to 1 part in 10¹⁷. If successful, it would improve current laboratory results by 4 orders of magnitude. A confirmation would strongly constrain theories; proof of violation is believed to lead to a scientific revolution. The experiment design allows it to be carried out at ambient temperature inside a small 1-axis stabilized satellite (250 kg total mass). GG is under investigation at Phase A-2 level by ASI (Agenzia Spaziale Italiana) at Thales Alenia Space in Torino, while a laboratory prototype (known as GGG) is operational at INFN laboratories in Pisa, supported by INFN (Istituto Nazionale di fisica Nucleare) and ASI. A final study report will be published in 2009.     

空间直角坐标直接计算高斯平面直角坐标公式

本文首先导出了由空间直角坐标直接解算大地纬度的精确而简明的实用公式。在此基础上，导出了由空间直角坐标直接计算高斯平面直角坐标公式。     

三维地质建模及其在地下空间开发中的应用

开发地下空间是许多城市谋求发展的重要途径,也是当前城市建设的重要组成部分。信息化是地下空间开发利用的必然要求,三维地质建模系统具有直观、高效、便利等特点,在城市地下空间开发利用领域有着广阔的应用前景。本文首先阐述了三维地质建模系统的理论方法,给出了三维地质建模流程,介绍了两种三维地质建模方法;然后分析了三维地质建模系统在地下空间选址、地下工程建设、地下空间管理中的应用