Some Tests for the Rent Gap Theory

1998 ◽  
Vol 30 (3) ◽  
pp. 523-542 ◽  
Author(s):  
C-F Yung ◽  
R J King

The ambiguity of the title is intended. Smith's rent gap theory is difficult to operationalize, and the authors propose tests for three of its aspects: to observe the presence or otherwise of a ‘rent valley’, to observe the coincidence of a rent gap with a period of gentrification, and to observe capital switching to inner-city alterations and additions. However, when the tests are applied to 1967–91 Melbourne data, they are somewhat testing for the theory itself: there are certainly rent gaps, but they are unevenly distributed over space and time, not consistently associated with periods of gentrification but rather with more complex shifts at the level of demand, and to be viewed as just a minor phenomenon of the broader processes of continual spatial restructuring.

Urban Studies ◽  
2009 ◽  
Vol 46 (5-6) ◽  
pp. 1157-1186 ◽  
Author(s):  
Aspa Gospodini

This paper deals with clusters of post-industrial urban economies and their impacts on the spatial restructuring and the relandscaping of the contemporary inner city. It investigates such impacts by studying recent economic, spatial and landscape transformations of Athens, a large Mediterranean city in the geographical and economic periphery of Europe. The first part of the paper reviews earlier research on clusters of post-industrial urban economies and their spatial impacts, while attempting to present the topic in an international context. The second part focuses on a case study of Athens, Greece. It examines the planned clusters of athletics, culture and leisure that were developed for the 2004 Olympics; and, the spontaneous clusters of both culture, leisure and creative activities, and technology-intensive and knowledge-rich activities and advanced financial intermediary services that have gradually developed in Athens' inner-city areas during the past decade. The paper documents land use shifts and landscape transformations while highlighting the processes of formation of these spontaneous clusters and the urban policies involved; it also discusses urban governance issues in relation to the management of Athens' clusters, both planned and spontaneous. Finally, it draws conclusions about differences in post-industrial trajectories among large cities in the core of Europe and large Mediterranean cities in the developing periphery of Europe.


2021 ◽  
Author(s):  
Andrés Núñez ◽  
Diego A Moreno ◽  
Ana M García ◽  
Raul Guantes

Abstract Background Compared to soil or aquatic ecosystems, the atmosphere is still an underexplored environment for microbial diversity. Besides its ecological importance, the spatial and temporal characterization of aerosolized microorganisms is relevant for understanding allergy and disease outbreaks, especially in highly populated cities. Results In this study, we surveyed the composition, variability and sources of microbes (bacteria and fungi) in the near surface atmosphere of a highly populated area, spanning ~ 4,000 Km 2 around the city center of Madrid (Spain), in different seasonal periods along two years. We found a core of abundant bacterial genera robust across space and time, most of soil origin, while fungi were more sensitive to environmental conditions. Microbial communities showed clear seasonal patterns driven by variability of environmental factors, mainly temperature and accumulated rain, while local sources played a minor role. We also identified taxa in both kingdoms characteristic of seasonal periods, but not of specific sampling sites or plant coverage. Conclusions The present study suggests that the near surface atmosphere of urban environments constitutes a stable ecosystem, with a relatively homogenous composition, modulated by climatic variations. As such, it contributes to our understanding of the long-term changes associated to the human exposome in the air of highly populated areas.


1992 ◽  
Vol 23 (3) ◽  
pp. 208-213 ◽  
Author(s):  
Marsha Lipscomb ◽  
Peggy Von Almen ◽  
James C. Blair

Twenty students between the ages of 6 and 19 years who were receiving services for students with hearing impairments in a metropolitan, inner-city school system were trained to monitor their own hearing aids. This study investigated the effect of this training on the percentage of students who wore functional hearing aids. Ten of the students received fewer than 3 hours of instruction per day in the regular education setting and generally had hearing losses in the severe to profound range. The remaining 10 students received greater than 3 hours of instruction per day in the regular education setting and had hearing losses in the moderate to severe range. The findings indicated improved hearing aid function when students were actively involved in hearing aid maintenance programs. Recommendations are made concerning hearing aid maintenance in the schools.


1997 ◽  
Vol 2 (4) ◽  
pp. 1-3
Author(s):  
James B. Talmage

Abstract The AMA Guides to the Evaluation of Permanent Impairment, Fourth Edition, uses the Injury Model to rate impairment in people who have experienced back injuries. Injured individuals who have not required surgery can be rated using differentiators. Challenges arise when assessing patients whose injuries have been treated surgically before the patient is rated for impairment. This article discusses five of the most common situations: 1) What is the impairment rating for an individual who has had an injury resulting in sciatica and who has been treated surgically, either with chemonucleolysis or with discectomy? 2) What is the impairment rating for an individual who has a back strain and is operated on without reasonable indications? 3) What is the impairment rating of an individual with sciatica and a foot drop (major anterior tibialis weakness) from L5 root damage? 4) What is the rating for an individual who is injured, has true radiculopathy, undergoes a discectomy, and is rated as Category III but later has another injury and, ultimately, a second disc operation? 5) What is the impairment rating for an older individual who was asymptomatic until a minor strain-type injury but subsequently has neurogenic claudication with severe surgical spinal stenosis on MRI/myelography? [Continued in the September/October 1997 The Guides Newsletter]


2018 ◽  
Vol 23 (4) ◽  
pp. 9-10
Author(s):  
James Talmage ◽  
Jay Blaisdell

Abstract Pelvic fractures are relatively uncommon, and in workers’ compensation most pelvic fractures are the result of an acute, high-impact event such as a fall from a roof or an automobile collision. A person with osteoporosis may sustain a pelvic fracture from a lower-impact injury such as a minor fall. Further, major parts of the bladder, bowel, reproductive organs, nerves, and blood vessels pass through the pelvic ring, and traumatic pelvic fractures that result from a high-impact event often coincide with damaged organs, significant bleeding, and sensory and motor dysfunction. Following are the steps in the rating process: 1) assign the diagnosis and impairment class for the pelvis; 2) assign the functional history, physical examination, and clinical studies grade modifiers; and 3) apply the net adjustment formula. Because pelvic fractures are so uncommon, raters may be less familiar with the rating process for these types of injuries. The diagnosis-based methodology for rating pelvic fractures is consistent with the process used to rate other musculoskeletal impairments. Evaluators must base the rating on reliable data when the patient is at maximum medical impairment and must assess possible impairment from concomitant injuries.


2004 ◽  
Vol 10 ◽  
pp. 27
Author(s):  
Vaidehi Kaza ◽  
Eric A. Jaffe ◽  
Gerald Posner ◽  
Maria Ferandez-Renedo ◽  
Zewge S. Deribe

2020 ◽  
Author(s):  
Marco Patriarca ◽  
Els Heinsalu ◽  
Jean Leó Leonard
Keyword(s):  

Author(s):  
Alain Connes ◽  
Michael Heller ◽  
Roger Penrose ◽  
John Polkinghorne ◽  
Andrew Taylor
Keyword(s):  

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