山西省万荣县寿圣寺塔的多视角影像三维重建

为了制定山西省万荣县寿圣寺塔的保护规划方案,需制作具有真实纹理的三维模型,但砖塔等大型不可移动文物的三维重建难度很大,制作成本一直很高。为此,本研究运用无人机拍摄和地面拍摄多视角影像的技术,制作寿圣寺塔的三维模型,生成各个立面的正射影像图,量算砖塔的高度、宽度等尺寸数据,为这类文物的三维重建提供一种新的技术和方法。     

Fluid effect on hydraulic fracture propagation behavior: a comparison between water and supercritical CO2‐like fluid

The initiation of hydraulic fractures during fluid injection in deep formations can be either engineered or induced unintentionally. Upon injection of CO₂, the pore fluids in deep formations can be changed from oil/saline water to CO₂ or CO₂ dominated. The type of fluid is important not only because the fluid must fracture the rock, but also because rocks saturated with different pore fluids behave differently. We investigated the influence of fluid properties on fracture propagation behavior by using the cohesive zone model in conjunction with a poroelasticity model. Simulation results indicate that the pore pressure fields are very different for different pore fluids even when the initial field conditions and injection schemes (rate and time) are kept the same. Low viscosity fluids with properties of supercritical CO₂ will create relatively thin and much shorter fractures in comparison with fluids exhibiting properties of water under similar injection schemes. Two significant times are recognized during fracture propagation: the time at which a crack ceases opening and the later time point at which a crack ceases propagating. These times are very different for different fluids. Both fluid compressibility and viscosity influence fracture propagation, with viscosity being the more important property. Viscosity can greatly affect hydraulic conductivity and the leak‐off coefficient. This analysis assumes the in‐situ pore fluid and injected fluid are the same and the pore space is 100% saturated by that fluid at the beginning of the simulation.     

旅游生态足迹初探——以嵩山景区2005年"五一"黄金周为例

在生态足迹理论与方法的基础上,提出了旅游生态足迹的概念,运用旅游生态足迹计算模型,从旅游交通、旅游住宿、旅游餐饮和旅游购物等4个方面计算了2005年“五一”黄金周期间嵩山景区的旅游生态足迹,并与郑州市的生态足迹对比。结果表明:黄金周期间,嵩山景区游客的人均旅游生态足迹0.02264gha,是郑州市周人均生态足迹0.00436gha的5.19倍,旅游是一种对自然资源高需求、高消耗的生活方式。指出旅游生态足迹计算方法的特点,影响旅游生态足迹大小的关键因子,减少旅游生态足迹的途径和旅游生态足迹计算中存在的问题。     

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.     

司徒美堂与抗日战争

美洲著名爱国侨领司徒美堂为祖国抗战做出了重大的贡献。他从九一八事变后即率先投身于抗日救亡运动,积极声援自发奋起抗战的国民党官兵;全国抗战爆发后,他出任抗日救国侨团的首领,带领广大华侨开展抗日救亡活动;他万里迢迢回国慰劳抗日军民,为祖国抗战出计献策,在途经香港陷入日军魔掌的危险时刻,表现出了铁骨铮铮的民族气节;他团结美洲洪门侨胞,报效祖国抗战,使这一古老的帮会组织焕发青春;他呼吁祖国团结抗战,反对妥协投降,有力地维护了国共合作抗战的大局。他是广大华侨抗日救国的领袖和楷模,其爱国思想在支援祖国抗战中进一步得到升华。     

Here be monsters: the Irish Industrial Exhibition of 1853 and the growth of Dublin department stores

This article explores the juxtaposition of the 1853 Irish Industrial Exhibition in Dublin and the dramatic rise of department stores in the city during the same decade. It analyses the aims, structure and reception of the 1853 Exhibition within the context of the Irish industrial movement, the economic modernity of the post-Famine era and the dramatic changes to consumer culture which were occurring during the 1850s. The article takes as its focus the hitherto neglected ‘monster house’ controversy – conducted in pamphlets and public lectures – regarding the growth of Dublin's department stores. Coinciding with the 1853 Exhibition, the controversy rehearsed many of the same concerns regarding economic and social structures in Irish urban society in the wake of the Famine. Consideration of the ‘monster house’ controversy alongside the issues raised by the 1853 Exhibition allows a new perspective on the development of middle-class urban life in Dublin during the mid-nineteenth century.     

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     

The Politics of Chivalry: Sir Robert Walpole,the Duke of Montagu and the Order of the Bath

This article explores the complex circumstances surrounding the foundation of the order of the Bath in 1725, and seeks to correct the commonly‐held view that it was initiated by Walpole simply to augment the patronage available to his supporters in parliament. The proposal for a new order of chivalry based on the medieval ‘knighthood of the bath’ in fact emanated from the court, having been prompted by one of its central figures, the duke of Montagu. Walpole and his colleagues were by no means oblivious to the practical political value of such a move, but having only lately consolidated their position at court, their main priority was to seize a unique opportunity to flatter the new royal dynasty and garner popularity for it through the medium of the order's rediscovered history. The ministers selected the order's 36 founder‐knights with considerable input from senior courtiers, but ensured that those nominated were mostly peers and MPs who could evince ministerially useful connections between court and parliament. Though the order was later derided as a symptom of Walpoleian corruption, its foundation can be regarded as something of a turning point in Walpole's rise to power.