Dealing with Timing and Synchronization in Opportunities for Joint Activity Participation. 公共活动参与机会中实时性与同步性处理

The ability of people to access opportunities offered by the built environment is circumscribed by various sets of space–time constraints, including the requirements to meet other persons at particular times and places to undertake activities together. While models of space–time accessibility recognize that joint activities may constrain the performance of activities in space and time, their specifications do not explicitly acknowledge the opportunities that individuals of a group have for joint activity participation. Therefore, this article focuses on joint activity participation and argues that collective activity decisions are the outcome of a complex process involving various aspects of timing, synchronization, and social hierarchy. The utility‐theoretic model proposed here quantifies the extent to which opportunities can be jointly accessed by a particular group of people within a specific time period. Central to the approach are three key variables: the attractiveness of an opportunity, the time available for activity participation, and the travel time to an activity location. Because of the multiperson character of joint activities, the determination of these variables is subject to individual preferences, privileges, and power differentials within a group. Specific attention is given to how time‐of‐day and synchronization effects influence the opportunities accessible to a group of individuals. The impact of these factors on joint accessibility is illustrated by a real‐world example of an everyday rendezvous scenario. The outcomes of a simulation exercise suggest that time‐of‐day and synchronization effects significantly affect the benefits that can be gained from opportunities for joint activities.     

Occupation humaine et environnement au 5e et au 4e millénaire sur la côte Sharjah-Umm al-Qaiwain (U.A.E.)

Three contributions in this issue are concerned with sites along the west coast of the United Arab Emirates which pre-date the Bronze Age. In this paper we shall attempt to view these sites in the broader geographical context of the southern Gulf coast; and thereafter to consider (1) the lithic material attested in the Arabian peninsula and dated to between the late 6th and early 4th millennium B.C.; (2) the painted pottery comparable to Mesopotamian Ubaid wares; and (3) a dozen CI4 dates (1) run on shell which all range around 6000-4500 BR The material utilized here comes from a series of expeditions conducted by the French Missions to Sharjah and Umm al-Qaiwain between 1985 and 1990 (2). The objectives of our geomorphological and archaeological inquiries were to observe, within a restricted area, the remains and evolution of human occupation in a changing environment.     

An Empirically Based Implementation and Evaluation of a Hierarchical Model for Commuting Flows. 一种基于经验的层状通勤流模型实现与评估

This article provides an empirical evaluation of a hierarchical approach to modeling commuting flows. As the gravity family of spatial interaction models represents a benchmark for empirical evaluation, we begin by reviewing basic aspects of these models. The hierarchical modeling framework is the same that Thorsen, Ubøe, and Nævdal (1999) used. However, because some modifications are required to construct a more workable model, we undertake a relatively detailed presentation of the model, rather than merely referring to the presentation in Thorsen, Ubøe, and Nævdal (1999) . The model uses a hierarchical specification of a transportation network and the individual search procedure. Journeys to work are determined by the effects of distance deterrence and of intervening opportunities, and by the location of potential destinations relative to alternatives at subsequent levels in a transportation network. The model calibration uses commuting data from a region in western Norway. The estimated parameter values are reasonable, and the explanatory power is very satisfactory when compared with the results of a competing destinations approach.     

A Framework for Exploring Urban Retail Discontinuities. 探索城市零售业不连续性的框架

A key area in the analysis of urban structural evolution is identifying discontinuities. Effective analysis could improve long‐term forecasting and provide a better understanding of how to steer an urban system toward a desirable future state. We use a simple aggregate retail model to demonstrate an algorithm for identifying discontinuities in model parameter space. Explorations of retailing in both Greater London and South Yorkshire in the United Kingdom illustrate how understanding a system's potential for discontinuity can provide insights for both policy makers and retail businesses. The Harris and Wilson model, described in the section so‐named, is used as a simple archetype to illustrate the new framework. This model can be developed in a straightforward way to incorporate further refinement. In “ Executing the model and visualizing the results ,” we describe a single model run and in “ Investigating discontinuities ,” we explain our framework for detecting and analyzing discontinuities. “ Identifying discontinuities in the London retail system ” shows the results of applying this methodology to the Greater London retail system, and in “ Practical applications ,” we explore the policy applications for this technique as related to the decline of town centers in the South Yorkshire retail system. Some concluding comments are offered in “ Conclusions .”     

On Puṇyapariṇāmanā in Nāgārjuna's Works

An important but rarely discussed feature in Nāgārjuna's works is the presence of a dedicatory verse (pu?yapari?āmanā) in some and its absence in others. The paper looks at all reliably attributed works by Nāgārjuna, examining similarities in those that dedicate merit and similarities in those that do not. In addition, the paper establishes the criterion by which the author classes some of his works as merit generating so that he, as a practising bodhisattva can transfer it. The paper concludes that, contrary to the established opinions, the motive of obtaining pu?ya has been of the highest importance for Nāgārjuna.     

Der zentralarabische Zweig der Weihrauchstraße

The information of Eratosthenes (Strabo 16.4.4) is of crucial importance for the reconstruction of one of the branches of the 'Incence Road' between Gerrha and a ramawt. According to the Classical sources as well as linguistic data ancient Gerrha must be sought in the 'double city' of al-Hufūf–al-'Uqayr. Comparison with other sources on the correspondence of the number of stages and the travel days of a caravan shows only one way to reach a ramawt from Gerrha: this way would have led from Qaryat al-Fāw not to Nǎrān, but to the south towards the mouth of the Wādīs abb and aš-Šu ayf.     

Der Natur‐Begriff des 17. Jahrhunderts und zwei seiner Inter‐pretamente: „res extensa”︁ und „intima rerum”︁

This article aims to show the general and broad use of the concept of nature in the philosophical discourse of the 17th century ‐ and in this context it is obvious that this discourse includes both philosophy and theology. I will discuss two opposite views concerning its fundamental understanding of nature, yet will not go into elaborating differences concerning such particular concepts as, for example, space, void or motion. These views and the theoretical positions from which they emerged will here be called res extensa and intima rerum ‐ this is done in order to clarify the basic opposition: there is no interior in pure extension and there is no extension at all in that what is called the interior. My aim is to show that these two views are, in fact, not quite as incompatible and contradictory as it easily may seem at first glance. Although I will for heuristic purposes introduce the two concepts res extensa and intima rerum as complete opposites and in a wholly contrary manner, ist should become clear that there exist both influences and interactions between these two notions. Theorists introduced here as advocates of the intima rerum‐position, can, for example, be seen as having been influenced by the mechanistic, or res extensa‐position, mainly through the formally and methodologically attractive geometric and mathematical argumentation. Likewise theorists advocating a mechanistic position can be said at some points to have been led by a substantial necessity concerning the contect of their argumentation to take recourse to the concept of intima rerum, at least partly or in a modified manner.