“水城”计划：柏林城市滨水地带的复兴

城市滨水地带曾经在工业的发展中发挥过巨大的作用。进入后工业社会以来，随着经济社会形态和产业结构的变化，城市中的滨水工业生产用地以及仓储用地相继被废弃。这些已经被污染的用地尽管需要花费高昂的代价去整治，但也具有很高的商业开发价值。本文介绍了德国统一之后柏林城市滨水地带再开发的两个大型项目实例，以期为国内类似问题和项目的研究提供借鉴和参考。     

水城:城市水资源的保护与利用

该文介绍了德国把城市水域重新利用开发为新的城市空间,利用滨水空间建造的高品质文化建筑,为居住之城增添许多新型城市空间的理论和实践。     

Gaussian-weighted Jensen–Shannon divergence as a robust fitness function for multi-model fitting

Model fitting is a fundamental component in computer vision for salient data selection, feature extraction and data parameterization. Conventional approaches such as the RANSAC family show limitations when dealing with data containing multiple models, high percentage of outliers or sample selection bias, commonly encountered in computer vision applications. In this paper, we present a novel model evaluation function based on Gaussian-weighted Jensen–Shannon divergence, and integrate into a particle swarm optimization (PSO) framework using ring topology. We avoid two problems from which most regression algorithms suffer, namely the requirements to specify inlier noise scale and the number of models. The novel evaluation method is generic and does not require any estimation of inlier noise. The continuous and meta-heuristic exploration facilitates estimation of each individual model while delivering the number of models automatically. Tests on datasets comprised of inlier noise and a large percentage of outliers (more than 90 % of the data) demonstrate that the proposed framework can efficiently estimate multiple models without prior information. Superior performance in terms of processing time and robustness to inlier noise is also demonstrated with respect to state of the art methods.     

Fermi Liquid Properties of 3He-4He Mixtures

We calculate microscopically the spectrum of a ³ He impurity atom moving in ⁴ He, determine the Fermi-Liquid interaction between ³ He atoms and then calculate the pressure and concentration dependence of the effective mass and the magnetic susceptibility. The long wavelength limit of the spectrum defines the hydrodynamic effective mass. When k 1.7Å^–1 the motion of the impurity is damped due to the decay into a roton and a low energy impurity mode. The calculations of the Fermi-Liquid interaction are based on correlated basis functions (CBF); the relevant matrix elements are determined by the Fermi hypernetted-chain theory. Our theoretical effective masses agree well with recent measurements, ^1,2 but our analysis suggests a new extrapolation to the zero-concentration limit. With that effective mass we also find a good agreement with the measured ³ Landau parameter F ₀ ^a .     

A Ground State Monte Carlo Approach for Studies of Dipolar Systems with Rotational Degrees of Freedom

We have developed a path integral ground state Monte Carlo (PIGSMC) algorithm for quantum simulations of rotating dipolar molecules, using a highly accurate sixth-order algorithm. The method allows us to calculate unbiased estimates of ground state properties of dipolar molecules in a variety of geometries, with or without an external electric field. To demonstrate the capability of the approach, we calculate the orientational phase diagram of a one dimensional lattice system of rotating point dipoles in the absence of any external electric fields. We find that for finite lattice size, this system exhibits an order?Cdisorder transition at finite dipolar interaction strength in contrast to the well-known orientational disorder of the corresponding one dimensional O(3) quantum rotor models. Comparison of the quantum Monte Carlo results with a self-consistent field estimate of the phase transition shows the emergence of an ordered phase at non-zero dipolar strength, confirming the symmetry breaking role of the anisotropic dipole?Cdipole interaction.     

Binding of Two Helium Atoms in Confined Geometries

We carry out a comprehensive study of the binding of two helium atoms in unrestricted and, in particular, in restricted geometries in both two and three dimensions. Besides the well known binding of the ⁴ He dimer in unrestricted geometry in two and three dimensions, we also find weakly bound states of the ³ He- ⁴ He molecule and the ³ He dimer in 2 dimensions. Furthermore, any combination of two ⁴ He or ³ He atoms can form a molecule if their motion is sufficiently confined. Our calculations are carried out by numerically solving the Schrödinger equation as well as by constructing a suitable variational wave function.     

"水城"计划:柏林城市滨水地带的复兴

城市滨水地带曾经在工业的发展中发挥过巨大的作用.进入后工业社会以来,随着经济社会形态和产业结构的变化,城市中的滨水工业生产用地以及仓储用地相继被废弃.这些已经被污染的用地尽管需要花费高昂的代价去整治,但也具有很高的商业开发价值.本文介绍了德国统一之后柏林城市滨水地带再开发的两个大型项目实例,以期为国内类似问题和项目的研究提供借鉴和参考.     

Interactive object modelling based on piecewise planar surface patches

Detecting elements such as planes in 3D is essential to describe objects for applications such as robotics and augmented reality. While plane estimation is well studied, table-top scenes exhibit a large number of planes and methods often lock onto a dominant plane or do not estimate 3D object structure but only homographies of individual planes. In this paper we introduce MDL to the problem of incrementally detecting multiple planar patches in a scene using tracked interest points in image sequences. Planar patches are reconstructed and stored in a keyframe-based graph structure. In case different motions occur, separate object hypotheses are modelled from currently visible patches and patches seen in previous frames. We evaluate our approach on a standard data set published by the Visual Geometry Group at the University of Oxford [24] and on our own data set containing table-top scenes. Results indicate that our approach significantly improves over the state-of-the-art algorithms.