Measuring the Shape Distortions of Retail Market Areas

Existing measures of shape rely upon prespecifying boundaries and have little relationship to theory. Where definite shape boundaries do not exist, these problems can be overcome by use of weighted data points and statistical moments. Measures of various shape properties are identified, including compactness and the degree of distortion from the circular shape underlying central place theory and, the gravity model; a bivariate normal distribution is assumed. Examples are included of the application of the measures to suburban retail market areas, although the measures are applicable to all situations in which the statistical model is a reasonable assumption and only subjective boundaries of shape can be identified.     

“洪崖”考辨

洪崖一词,<敦煌变文校注>中被解释为是仙人名、地理专有名词,但是结合传世典籍、出土文献和方言现状等方面来考释,发现<校注>的释义并不准确,洪崖在敦煌变文中的含义应该就是其本义高大的山崖.     

Geographic Study of the Natural Characteristics and the Economic Utilization of the Land Areas of the USSR

This paper by a leading Soviet theoretical physical geographer traces the historical development of the Soviet doctrine of geographic zonality and the role played by heat-moisture relationships in determining the structure, the dynamics and the development of natural geographic zones. The paper includes a table of geographic zonality and explains the periodic character of geographic zonality. Am American review article that provides useful background is: Jacek I. Romanowski, A Survey of Heat and Water Balance Research in the Soviet Union, University of Washington, Discussion Paper No. 41.     

A Note on Marinus of Alexandria

Abstract

Neurology in its modern sense was first studied in the well‐known neurological institutions of France and England. In America, however, this new field of medicine was developed by a physician in a private practice, Dr. William Alexander Hammond. This article addresses the question how Hammond was able to limit his practice to neurology. It is argued that Hammond was a famous military physician before becoming the first practitioner of clinical neurology in America. This fame translated into a large referral base.