Errors in the estimation of the distance of fall and angles of impact blood drops.

This paper presents derived equations for the estimation of the variances in the estimated distance of fall and the estimated angle of impact for blood droplets. The derived equation for the variance of the estimated distance of fall predicts that as the blood drop size approaches that of a blood droplet falling at terminal velocity, the variance of the estimate grows without limit. The derived equation for the variance in the estimated angle of impact shows that as the angle of impact approaches 90 degrees, the variance grows without limit. The validity of the equation for the estimated variance of the angle of impact was tested for five angles of impact (15, 30, 45, 60 and 75 degrees); the equation correctly predicted the observed variance up to an angle of 60 degrees.     

The personal impact of delivering a one-to-one treatment programme with high-risk sexual offenders: Therapists' experiences

Abstract

Previous research suggests that delivering treatment for sexual offenders can have both positive and negative effects on therapists. We know less about the specific impact of conducting such work in different ways; for example, individually rather than in groups. This study aimed to explore the experiences of sexual offender therapists delivering a one-to-one programme with clients. Eleven therapists delivering an individual intervention with high-risk sexual offenders in English prisons took part in interviews and focus groups about the impact this work has had upon them. One participant also completed a diary charting their experiences while delivering the intervention. Content analysis identified that participants felt they experienced changes in how they viewed themselves, others and the therapeutic relationship, in both positive and negative ways. They also described experiencing intrusive thinking and feeling overly responsible for the outcome of treatment. However, positive effects were also identified. Findings suggest that the provision of structured supervisory support was particularly key in mitigating the impact of treatment delivery.     

Wrestling Sprawl to the Ground: Defining and measuring an elusive concept

Abstract

The literature on urban sprawl confuses causes, consequences, and conditions. This article presents a conceptual definition of sprawl based on eight distinct dimensions of land use patterns: density, continuity, concentration, clustering, centrality, nuclearity mixed uses, and proximity. Sprawl is defined as a condition of land use that is represented by low values on one or more of these dimensions.

Each dimension is operationally defined and tested in 13 urbanized areas. Results for six dimensions are reported for each area, and an initial comparison of the extent of sprawl in the 13 areas is provided. The test confirms the utility of the approach and suggests that a clearer conceptual and operational definition can facilitate research on the causes and consequences of sprawl.     

Book Reviews

The Way the Modern World Works: World Hegemony to World Impasse. Peter J. Taylor, 1996. Chichester and London: John Wiley. 276 pp.; £18.99 paperback. ISBN 0 471 96586 3

Imagineering Atlanta: The Politics of Place in the City of Dreams. C. Rutheiser, 1996. London: Verso. 324 pp.; £14.00 paperback. ISBN 1 85984 800 1

Represénter la ville, coll.. A. Bailly, C. Baumont, J. Huriot and A. Sallez, 1995. Paris: Economica. 112 pp.; £7.00 paperback. ISBN 2 7178 2956 3

Continental Trading Blocs: The Growth of Regionalism in the World Economy. R. Gibb and W. Michalak (Eds), 1994. Chichester: John Wiley. 302 pp.; £45.00 hardback. ISBN: 4719 49 094

Mapping Desire. D. Bell and G C. Valentine (Eds), 1995. London: Routledge. 370 pp.; £15.99 paperback. ISBN 0 415 1164 1     

‘Sustainable development’ and the environment

The Sociology of Modernization and Development. By David Harrison. London: Unwin Hyman, 1988. Pp.xvi + 196 £30 and £10.95. ISBN 0 04 301220 5 and 301221 3.

Theories of Development: Capitalism, Colonialism and Dependency. By Jorge Larrain. Cambridge: Polity Press, 1989. Pp.ix + 252. £29.50 and £8.95. ISBN 07456 0710 1 and 0711 X.

The Globalisation of High Technology Production: Society Space and Semiconductors in the Restructuring of the Modern World. By Jeffrey Henderson. London: Routledge, 1989. Pp.xxiii + 198 £30. ISBN 0 415 03139 7.

Conflict Resolution in Uganda. Edited by Kumar Rupesinghe. Oslo: International Peace Research Institute (Peace Research Monograph No.16), 1989. Pp.307. £25 (hardback), £9.95 (paperback). ISBN 0 85255 334 X and 333 1.

Growing Out of Debt. By Adrian Hewitt and Bowen Wells. Nottingham: Russell Press for the Overseas Development Institute for the All Party Parliamentary Group on Overseas Development. Pp.83. £4.95 (paperback). ISBN 0 85003 1214.

Oil in the World Economy. Edited by R.W. Ferrier and A. Fursenko. London: Routledge, 1989. Pp.xii + 113. £35. ISBN 0 415 00379 2.

Industrial Adjustment in Sub‐Saharan Africa. Edited by Gerald M. Meier and William F. Steel. Oxford: Oxford University Press for the World Bank, 1989. Pp. xvi + 293. £22.50. ISBN 0 19 520784 X.

Farm Implements for Small‐scale Farmers in Tanzania. By Bjorn Mothander, Finn Kjaerby and Kjell Havnevik. Uppsala: The Scandinavian Institute of African Studies, 1989. Pp.214. SEK 120. ISBN 91 7106 290 4.

Urban Poverty and the Labour Market: Access to Jobs and Incomes in Asian and Latin American Cities. Edited by Gerry Rodgers. Geneva: International Labour Office, 1989. Pp.xv + 257. Sw. frs. 35. ISBN 92 2 106499 9 and 106500 6.     

Characterization of the Products Formed by the Reaction of Trichlorocyanuric Acid with 2-Propanol

Abstract:  We report a recent investigation into the death of a cat that was initially thought to involve intentionally burning the animal via the use of an ignitable liquid. The exposure of the animal to flame was ruled out. Instead, forensic investigation revealed the intentional mixing together of a common outdoor swimming pool chlorinator, trichlorocyanuric acid (TCCA), and 2-propanol (aka, isopropyl alcohol or rubbing alcohol). The reaction of these two chemicals resulted in the formation of cyanuric acid residue, hydrochloric acid, and the evolution of a significant volume of chlorine gas. Further α-chlorination side reactions also occurred between 2-propanol and TCCA to produce a variety of chlorinated 2-propanone species that were detected on the submitted evidence. The identification of the products of both the main reaction and the side reactions allowed the authors to determine what chemicals were originally mixed together by the culprit.     

Coase and Bertrand on lighthouses

Coase (Journal of Low and Economics 17(2):185–213, 1974) failed to appreciate that the construction and maintenance of nineteenth-century lighthouses were in part financed by British taxpayers. Bertrand (Cambridge Journal of Economics 30:389–402, 2006) rightly calls him to account. While agreeing with Bertrand’s conclusion, we dispute her reasoning and argue that lighthouses nevertheless could have been supplied by the private sector.