Restoration of paintings on domes with non-developable geometry (Los Santos Juanes Church in Valencia)

The restoration of paintings on elements in cultural heritage buildings (fundamentally, churches) involves two structural problems: capturing the geometry of the construction element and its development. In many cases, the geometries are regular (e.g., cylinders, spheres, elliptical domes). However, there are cases in which the elements cannot be adapted to any known geometry, much less one that can be mathematically developed. The development of surfaces becomes essential for the restoration of paintings over “flat elements” (over which work is performed on the ground) that are subsequently transferred to the real surface (ceilings). The mathematical transformations that allow regular geometries to be developed are widely known (cartographic projections). However, when the geometry is irregular, there is no development. This study presents a new methodology based on differential rectification and its application for the development of oculi in the Los Santos Juanes Church (Valencia), whose geometry is completely irregular both in shape and as a result of construction defects (and damage caused by fire). The present study focuses on the restoration of paintings damaged by fire.     

基于多层次灰色方法的旅游地产项目开发风险评价模型及实证研究

旅游地产是将旅游业和房地产两大产业融合而衍生出的一种新型地产开发模式,目前已经引起各地政府的高度重视,但在实际的开发与运行中存在着很大的风险性。因此本文对于旅游地产项目的开发风险从量化的角度进行分析评价,通过构建旅游地产项目开发风险的评价指标体系,以及采用主观的层次分析法与客观的变异系数法相结合的方法确定综合权重,以此建立起基于多层次灰色模型的旅游地产项目开发风险评价模型。并以A企业为例进行了实证研究,结果显示A企业的旅游地产项目开发风险处于一般风险与较低风险之间,适合进行项目的开发与投资。     

基于APSO—SVR的山岳风景区短期客流量预测

根据山岳风景区短期客流量小样本、非线性等特征,本文提出基于自适应粒子群算法（Adaptive Particle Swarm Optimization,APSO）的支持向量回归（Support Vector Regression,SVR）模型,融合SVR处理小样本、非线性预测特性和APSO优化SVR参数的能力对山岳风景区短期客流量进行预测。来自山岳风景区黄山2008年～2011年暑期相关日数据的验证结果表明：与PSO—SVR、GA—SVR和BPNN等模型相比,APSO。SVR模型的预测准确性更高、误差更小,是进行山岳风景区短期客流量预测的有效工具。     

1949—1951年美国如何阻挠和破坏西藏和平解放

1949—1951年间,美国策划达赖喇嘛出走,破坏西藏和平解放。起初,美国反对达赖喇嘛离藏,支持噶厦抵抗人民解放军解放西藏。美国后来认识到不可能阻挡人民解放军的进军,因而要求达赖喇嘛流亡锡兰或泰国,不得已时到美国"避难"。《十七条协议》公布后,美国反对达赖喇嘛返回拉萨,要求达赖喇嘛在靠近西藏的地区流亡或"访问"印度。中华人民共和国中央人民政府采取因地制宜的措施,达赖喇嘛最终返回西藏并通电拥护《十七条协议》。美国的企图必然破灭,西藏的和平解放是历史发展的必然。     

英国秘密档案中记载的印度华侨陆兴祺

本文利用了重要的、鲜为人知的中外有关文献 ,深入细致地论述了英国秘密档案中记载的民国初年护理西藏办事长官陆兴祺 ,并兼论印度华侨在维护中央对西藏的主权中所起的重要作用 ,介绍了清末至 2 0世纪 30年代护理西藏办事长官陆兴祺在印度活动时所涉及的重要背景、中外人物、其中的冲突、中外交涉及结果等 ,从而为民国年间的中外交涉以及有关西藏史和印度华侨的研究提供了有益的史料     

接近与嫡系心智模式是旅行社增强竞争力的主要障碍

心智模决定人们的思维方式和行为习惯。章认为接近与嫡系不良心智模式是旅行社增强竞争力的主要障碍。旅行社应积极倡导学习与效益型的心智模式。     

Global finance and the German model: German corporations, market incentives, and the management of employer-sponsored pension institutions

Where there was a settled political geography of state power and responsibilities, the remarkable growth of global finance has put enormous pressure on national economic, political and social institutions. Furthermore, the looming crisis facing many continental European social security systems has raised many doubts about the long-term viability of the German model compared to its Anglo-American rivals. In this context, large German corporations have sought ways of sustaining their global competitiveness by, in part, restructuring their national and regional commitments. To illustrate, in this paper we concentrate on the nature and organization of German employer-sponsored pension institutions in relation to Anglo-American management practice. Two issues drive the analysis. One has to do with an emerging coalition between corporate management and shareholders with respect to the market value of the firm. The second issue has to do with the allocation of risk and uncertainty between the social partners when negotiating the financing and final value of promised retirement income. The institutional framework of collective decision-making common to many of Germany's largest firms is under pressure; three models of investment decision making relevant to pension assets and liabilities are used to illustrate this point. In doing so, we suggest that the German model is more fragile than commonly realized. We also suggest that Anglo-American management practices have penetrated and affected German corporate (national and regional) institutions and regulations. The social market lauded by advocates of stakeholder capitalism is changing rapidly, at least in the sphere of large firms and global finance.     

Book Reviews

Books reviewed:
Cyberspace: The World in WiresRob Kitchin
Mike Crang, Phil Crang and Jon May, (eds.) Virtual Geographies: Bodies, Space and Relations
Joanne P. Sharp, Paul Routledge, Chris Philo and Ronan Paddison, (eds.) Entanglements of Power: Geographies of domination/resistance
Steven Daniels, Humphrey Repton: Landscape Gardening and the Geography of Georgian England
David Harvey, Spaces of Hope
Robert J. Mayhew, Enlightenment geography: the political languages of British geography 1650-1850
Felix Driver, Geography Militant: Cultures of Exploration and Empire
Eric Sheppard and Trevor Barnes, (eds.) A Companion to Economic Geography
Gordon L. Clark, Maryann P. Feldman and Meric S. Gertler, (eds.) The Oxford Handbook of Economic Geography     

Thermal convection in faulted extensional sedimentary basins: theoretical results from finite-element modeling

Thermal convection has the potential to be a significant and widespread mechanism of fluid flow, mass transport, and heat transport in rift and other extensional basins. Based on numerical simulation results, large‐scale convection can occur on the scale of the basin thickness, depending on the Rayleigh number for the basin. Our analysis indicates that for syn‐rift and early post‐rift settings with a basin thickness of 5 km, thermal convection can occur for basal heat flows ranging from 80 to 150 mW m^?2, when the vertical hydraulic conductivity is on the order of 1.5 m year^?1 and lower. The convection cells have characteristic wavelengths and flow patterns depending on the thermal and hydraulic boundary conditions. Steeply dipping extensional faults can provide pathways for vertical fluid flow across large thicknesses of basin sediments and can modify the dynamics of thermal convection. The presence of faults perturbs the thermal convective flow pattern and can constrain the size and locations of convection cells. Depending on the spacing of the faults and the hydraulic properties of the faults and basin sediments, the convection cells can be spatially organized to align with adjacent faults. A fault‐bounded cell occurs when one convection cell is constrained to occupy a fault block so that the up‐flow zone converges into one fault zone and the down‐flow zone is centred on the adjacent fault. A fault‐bounded cell pair occurs when two convection cells occupy a fault block with the up‐flow zone located between the faults and the down‐flow zones centred on the adjacent faults or with the reverse pattern of flow. Fault‐bounded cells and cell pairs can be referred to collectively as fault‐bounded convective flow. The flow paths in fault‐bounded convective flow can be lengthened significantly with respect to those of convection cells unperturbed by the presence of faults. The cell pattern and sense of circulation depend on the fault spacing, sediment and fault permeabilities, lithologic heterogeneity, and the basal heat flow. The presence of fault zones also extends the range of conditions for which thermal convection can occur to basin settings with Rayleigh numbers below the critical value for large‐scale convection to occur in a basin without faults. The widespread potential for the occurrence of thermal convection suggests that it may play a role in controlling geological processes in rift basins including the acquisition and deposition of metals by basin fluids, the distribution of diagenetic processes, the temperature field and heat flow, petroleum generation and migration, and the geochemical evolution of basin fluids. Fault‐bounded cells and cell pairs can focus mass and heat transport from longer flow paths into fault zones, and their discharge zones are a particularly favourable setting for the formation of sediment‐hosted ore deposits near the sea floor.     

Hydrothermal dolomitization,mixing corrosion and deep burial porosity formation: numerical results from 1‐D reactive transport models

Major corrosion has been found at depth in carbonate hydrocarbon reservoirs from different geologic provinces. Fluid inclusion microthermometry and stable isotopic compositions of carbonate cements, predating major corrosion, constrain the interpretation of the evolution of parental fluids during progressive burial and prior to the major corrosion event. Post‐major corrosion mineral paragenesis includes pyrite (‐marcasite), anhydrite, kaolinite (dickite) and fluorite. Although the post‐corrosion mineral paragenesis represents minor volumes of rock, it may provide valuable insights into the post‐corrosion brine chemistry. Using reactive transport numerical models, the roles of cooling and/or mixing of brines on corrosion have been evaluated as controls for dolomitization, deep burial corrosion and precipitation of the post‐corrosion mineral paragenesis. Modelling results show that cooling of deep‐seated fluids moving upward along a fracture may cause minor calcite dissolution and porosity generation. Significant dolomitization along a fracture zone and nearby host‐rock only occurs when deep‐seated fluids have high salinities (4 mol Cl kg^?1 of solution) and Darcian flow rates are relatively high (1 m³ m^?2 year^?1). Only minor volumes of quartz and fluorite precipitate in the newly formed porosity. Moreover, modelling results cannot reproduce the authigenic precipitation of kaolinite (dickite at high temperatures) by cooling. As an alternative to cooling as a cause of corrosion, mixing between two brines of different compositions and salinities is represented by two main cases. One case consists of the flow up along a fracture of deep‐seated fluids with higher salinities than the fluid in the wall rock. Dolomite does not precipitate at a fracture zone. Nevertheless, minor volumes of dolomite are formed away from the fracture. The post‐corrosion mineral paragenesis can be partly reproduced, and the results are comparable to those obtained from cooling calculations. Minor volumes of quartz and fluorite are formed, and kaolinite‐dickite does not precipitate. The major outputs of this scenario are calcite dissolution and slight net increase in porosity. A second case corresponds to the mixing of low salinity deep‐seated fluids, flowing up along fractures, with high salinity brines within the wall rock. Calculations predict major dissolution of calcite and precipitation of dolomite. The post‐corrosion mineral paragenesis can be reproduced. High volumes of quartz, fluorite and kaolinite‐dickite precipitate and may even completely occlude newly formed porosity.