The origins of salinity in metamorphic fluids

Evaluation of data on formation waters and metamorphic fluids sampled by drilling or preserved in fluid inclusions reveals little correlation between fluid salinity and metamorphic grade, but a strong link to original sedimentary setting. Sediments and metasediments deposited originally in shallow marine environments can contain fluids with a very wide range of salinities, but they are commonly near twice seawater salinity or higher. With increasing metamorphic grade, a very wide range of salinities may develop, with the highest levels tracking halite saturation. Oceanic and accretionary prism sequences yield low‐salinity fluids, close to seawater values, almost irrespective of metamorphic grade until extreme conditions are reached where removal of water may increase fluid salinity. The salinities of metamorphic fluids exert a fundamental control on both fluid phase equilibria and metal‐transporting capability, and appear, to a large degree, to reflect the original presence or absence of highly saline formation waters and/or evaporites in the initial sedimentary sequence.     

内部营销和内部服务质量对外部服务质量的影响

管理人员应明确员工的工作任务、评估员工的服务质量、指导员工工作、关心员工、高度重视员工培养工作,各个职能部门之间的相互服务质量、员工之间的相互服务质量都会直接或间接地影响宾馆的外部服务质量。作根据数据分析结果,对宾馆管理人员如何加强内部服务质量管理提出了一系列建议。     

论上海旅游集散中心的形成与发展

上海旅游集散中心开创了散客旅游的一种组织模式。是散客旅游需求的扩张为散客接待服务的专业化提供了必要条件,专业化程度的提高又导致企业与企业纵向一体化的发展。     

External validity of hedonic price estimates: Heterogeneity in the price discount associated with having Black and Hispanic neighbors

We examined the hedonic price of neighborhood racial composition across a sample of 180 US housing markets and compared heterogeneity in results. Statistically significant estimated price elasticities calculated at the mean ranged from ?0.61 to 0.2 and ?0.26 to 0.21, for increases in Black and Hispanic neighborhood proportion, respectively. Hedonic price discounts for Black neighborhoods were greater when land supply was more inelastic, when the land value share of the housing cost was greater, and in the southern portion of the United States. Hedonic price discounts associated with Hispanic neighborhoods exhibited no patterns relative to geography or housing supply factors.     

Geometry‐coupled reactive fluid transport at the fracture scale: application to CO2 geologic storage

Water acidification follows CO₂ injection and leads to reactive fluid transport through pores and rock fractures, with potential implications to reservoirs and wells in CO₂ geologic storage and enhanced oil recovery. Kinetic rate laws for dissolution reactions in calcite and anorthite are combined with the Navier‐Stokes law and advection–diffusion transport to perform geometry‐coupled numerical simulations in order to study the evolution of chemical reactions, species concentration, and fracture morphology. Results are summarized as a function of two dimensionless parameters: the Damköhler number Da which is the ratio between advection and reaction times, and the transverse Peclet number Pe defined as the ratio between the time for diffusion across the fracture and the time for advection along the fracture. Reactant species are readily consumed near the inlet in a carbonate reservoir when the flow velocity is low (low transverse Peclet number and Da > 10^?1). At high flow velocities, diffusion fails to homogenize the concentration field across the fracture (high transverse Peclet number Pe > 10^?1). When the reaction rate is low as in anorthite reservoirs (Da < 10^?1), reactant species are more readily transported toward the outlet. At a given Peclet number, a lower Damköhler number causes the flow channel to experience a more uniform aperture enlargement along the length of the fracture. When the length‐to‐aperture ratio is sufficiently large, say l/d > 30, the system response resembles the solution for 1D reactive fluid transport. A decreased length‐to‐aperture ratio slows the diffusive transport of reactant species to the mineral fracture surface, and analyses of fracture networks must take into consideration both the length and slenderness of individual fractures in addition to Pe and Da numbers.     

Industrial policies in a Marshallian-based multilevel perspective

Drawing on a multilevel framework of Marshallian external economies, we present a perspective on the foundations of enterprise policies across different levels of government. In so doing, we add complexity to the traditional approach to industrial districts, which often disregards the role of supra-local policies. The argument is based on the idea that the main task of policy-makers is not just to provide generic public goods for communities of people defined by administrative boundaries, but also to support the provision of public goods that strengthen the competitiveness and innovative capacity of social and productive systems functioning at various territorial scales, from that of compact centres of industry to the nation-state and beyond. We apply this multilevel framework to the interpretation of the Italian enterprise policies.     

Co-Producing Mobilities: negotiating geographical knowledge in a conference session on the move

In an experimental session entitled Co-Producing Mobilities held at the 2014 Royal Geographical Society-Institute of British Geographers Annual Conference, 20 mobility scholars travelled around London on foot, by bus and by Tube to investigate how mobilities could be considered co-produced. In this paper, 18 participants reflect on this collaborative experiment and on how it influenced their thinking about mobilities, geographical knowledge and pedagogy. Contributions cast light on the function of conferences and the multiple forms of pedagogy they enable, and provide guiding resources for those now wanting to continue such experiments.     

Negotiating mobility in gendered spaces: case of Pakistani women doctors

Through their gendered spatial practices, women in Pakistan re-negotiate and contest the multiple social and material restrictions in their daily mobility to reclaim the urban transit spaces, specifically, roads. Ethnographic research on the automobile use and driving with the women doctors in Lahore, Pakistan reveal the relationship between these strategic practices and the educational and occupational choices of women. These spatially embedded, intentional practices of women doctors, contingent on their social and economic positions, are directly linked to the emerging gendered identities and changing social and material gendered boundaries in Pakistani society. Moreover, these changing spaces are part of on-going flux of shifting power relations between traditional patriarchy and capitalism.     

中国交通运输地理学近十年研究进展

目前中国交通运输地理学的研究集中在六个大的方面:交通运输与发展研究、港口地理研究、航空运输地理起步、物流地理、城市交通运输地理以及新技术、新方法的引进与创新。中国交通运输地理学在逐步与国际交通运输地理研究接轨,但研究的深度与广度仍有一定的差距,特别是乡村交通运输地理、港口服务业地理、城市交通运输地理与物流地理的研究尚有较多工作要开展。     

Constellations of (in-)convenience: disentangling the assemblages of Canada's west coast island mobilities

Drawing from fieldwork conducted to examine the roles played by ferry mobilities in the lives of residents of ferry-dependent islands and coastal communities of British Columbia, Canada, this paper focuses on three elements of spatial mobility assemblages: motives, costs, and frictions. In doing so, this paper contributes to the growing literature on the politics of mobility constellations. Data shed light on the transformative, but contested, power of spatial mobilities. To analyze these dynamics the analysis builds upon Ingold's ideas on wayfaring to highlight how practices, representations, and experiences of ferry mobility exercise their transformative power.