Doing Great Basin archaeology recently: Coping with variability

Great Basin archaeologists spent the 1970s and most of the 1980s tearing down the Desert Culture hypothesis without presenting compelling means for dealing with the empirical variability that made it untenable. Recent research seeks to understand this variability by examining the effect of key variables in extreme environmental contexts, especially in wetlands and at high altitudes, and by developing and refining models of optimality that anticipate variability as the local expression of general evolutionary ecological principles. Research on intraregional and ethnic variability has lagged behind—the former because it is said to be costly, the latter because it is problematical in theory.     

A Lingering Diminuendo? The Conference on Devolution, 1919–20

This article looks at one of the more obscure moments in British constitutional history, the rise of federal devolution in the United Kingdom in the early 20th century and, in particular, the context to the Conference on Devolution that sat between October 1919 and April 1920. The conference, as this article will briefly discuss, has been relegated to footnote status in the historiography on federal devolution and British politics. However, while the conference has not been the subject of detailed academic attention, the claim that devolution and constitutional reform in this period was a by‐product of the crisis in Ireland pre‐partition has gathered considerable traction among political historians. This article will redress both the paltry analysis of the Conference on Devolution within the academic literature and the Irish‐centric historiography on federal devolution in the early 20th century. On the latter front, this article will demonstrate that the conference was the product of forces that extended beyond the Irish crisis, in particular parliamentary congestion. As for the conference itself, this article will use a wide range of archival sources to examine critically the conference's deliberations and in doing so will challenge prevailing assumptions regarding the supposedly one firm source of agreement during the conference: the powers that the devolved bodies should enjoy.     

聚集经济与最优城市规模探讨

经济活动的空间集中是一个引人注目的现象,聚集经济是空间集中的重要原因之一。虽然外部性对经济活动的集中有重要影响,但要解释聚集经济的来源还必须寻求更微观、更基本的经济主体行为上的原因。每个城市都存在着一个最优的规模,这个最有效率的规模是由经济活动空间集中所带来的利益与所引起的成本之间的一个均衡所决定的。因此,在城市化过程中,必须注重城市功能与效率的充分发挥。本文结合规模收益递增和单中心圆形城市模型,分析了通勤成本、城市规模收益递增程度对最优城市规模的影响,讨讨了城市人均收入与城市规模之间的关系,推导了两种对立的力量所决定的最优城市规模。文中指出:在一定条件下,城市人均收入与城市规模之间存在倒U形关系;否则,在城市总生产函数中规模收益递增程度足够强的情况下,最优城市规模取决于通勤成本。     

Reply to Flesher–Rick Rylance

Walter Moxon, MD, FRCP lived, practiced medicine, taught and wrote in the mid- to late- nineteenth-century Victorian England, mostly at Guy's Hospital, London. He was widely informed in the “Art of Physic,” writing on a range of issues from cerebral lateralization of articulate speech to angina pectoris. The present paper will trace briefly his contributions to the newly discovered asymmetry of articulate speech in the left frontal lobe (1866) and will in more detail trace and analyze his 1881 Croonian Lectures at the Royal College of Physicians on a medical shibboleth referred to as “congestion of the brain.” In a series of ingenious and rhetorically creative arguments with imaginative tropes, demonstrations, evolutionary accounts of cognition and blood metabolism for human/biped cognition, and cogent citations from the medical literature of the day, Moxon skillfully instructs his medical audience against the misleading notion of cerebral “congestion” as an underlying pathology for cognitive, motor, and sensory deficits seen in the clinic. In so doing, he provides the medical community with an in-depth glimpse at the circulatory system, its flow dynamics, and how they serve to meet the cognitive, motor, and sensory demands of upright bipedal man.     

Mineral precipitation associated with vertical fault zones: the interaction of solute advection,diffusion and chemical kinetics

This article is concerned with chemical reactions that occur between two interacting parallel fluid flows using mixing in vertical faults as an example. Mineral precipitation associated with fluid flow in permeable fault zones results in mineralization and chemical reaction (alteration) patterns, which in turn are strongly dependent on interactions between solute advection (controlled by fluid flow rates), solute diffusion/dispersion and chemical kinetics. These interactions can be understood by simultaneously considering two dimensionless numbers, the Damköhler number and the Z‐number. The Damköhler number expresses the interaction between solute advection (flow rate) and chemical kinetics, while the Z‐number expresses the interaction between solute diffusion/dispersion and chemical kinetics. Based on the Damköhler and Z‐numbers, two chemical equilibrium length‐scales are defined, dominated by either solute advection or by solute diffusion/dispersion. For a permeable vertical fault zone and for a given solute diffusion/dispersion coefficient, there exist three possible types of chemical reaction patterns, depending on both the flow rate and the chemical reaction rate. These three types are: (i) those dominated by solute diffusion and dispersion resulting in precipitation at the lower tip of a vertical fault and as a thin sliver within the fault, (ii) those dominated by solute advection resulting in precipitation at or above the upper tip of the fault, and (iii) those in which advection and diffusion/dispersion play similar roles resulting in wide mineralization within the fault. Theoretical analysis indicates that there exists both an optimal flow rate and an optimal chemical reaction rate, such that chemical equilibrium following focusing and mixing of two fluids may be attained within the fault zone (i.e. type 3). However, for rapid and parallel flows, such as those resulting from a lithostatic pressure gradient, it is difficult for a chemical reaction to reach equilibrium within the fault zone, if the two fluids are not well mixed before entering the fault zone. Numerical examples are given to illustrate the three possible types of chemical reaction patterns.     

旅游重要性感知、旅游动机与人口特征:基于香港居民调查数据的实证研究

本文基于对香港居民的大规模电话调查,采用最优尺度回归模型,探讨出游动机和人口统计特征如何影响香港居民对旅游重要性的感知以及人口统计特征如何影响香港居民的出游动机。回归结果显示:休闲放松和发掘新事物是影响旅游重要性感知的主要旅游动机,家庭月收入和受教育程度是影响旅游重要性感知的主要人口统计特征;与亲朋好友聚会、社交、休闲放松、逃脱日常事务和发掘新事物动机最相关的人口统计特征分别是家庭月收入、年龄、家庭月收入、年龄和受教育程度,而性别对香港居民的各种出游动机无显著影响。     

交通拥堵治理的空间与基础设施政策综述

交通拥堵是制约国内外城市可持续发展的瓶颈问题之一,给城市经济、社会与环境带来诸多负面影响.本文聚焦城市交通拥堵的结构性因素,系统归纳和综述了引导可持续出行行为的空间政策(如城市空间结构和土地利用政策)与基础设施供应侧政策(如道路和公共交通基础设施投资政策),及其在交通拥堵治理上的理论探讨、学术争论焦点、实证分析及当前亟...     

贵阳市道路拥堵状态时空分布规律研究——基于出租车GPS大数据

利用贵阳市出租车GPS数据,建立ArcGIS空间模型计算路段平均行程速度,以空间数据库和ArcGIS空间分析为技术支撑,分析道路拥堵状态的时空演化规律。结果表明：①路网平均行程速度的时间分布特征具有高度相似性,且工作日与休息日分布差异大;②工作日高峰时段拥堵区域分布主要以老城区为主。休息日总体上呈现离散分布趋势,且晚高峰时段交通状况比早高峰更拥堵;③工作日早高峰交通拥堵路段呈由中心核心区逐渐向外围扩散的趋势,晚高峰呈由外围向中心核心区聚拢趋势。休息日早高峰不明显,晚高峰呈现由外围区域向内聚拢趋势。基于上述时空演化规律,从城市功能分散、城市道路网、城市空间发展、城市公交系统等方面讨论了贵阳市城市道路交通优化调整对策。