Secondary upwelling instabilities developed in high Rayleigh number convection: Possible applications to hot spots

We have conducted numerical experiments for mantle convection in an axisymmetrical spherical-shell geometry from Rayleigh numbers ranging from three million to 10 billion for a purely basal heating configuration. We focus on the development of secondary instabilities developed from plumes and compare them with laboratory experiments by Skilbeck and Whitehead (1978) and Whitehead, (1982). For Rayleigh numbers between around thirty million to one billion, a string of these secondary instabilities can develop from a single plume. Analysis of the spectrum of wavelength associated with the fold instabilities shows that there is a window in the Rayleigh number between around ten million and one bilion where these secondary folding instabilities would develop. These results, when applied to the upper mantle, may explain the formation of hot-spots in a turbulently convecting upper-mantle with a Rayleigh number greater than ten million.     

Reassessing welfare reform data: a response to cherry

Abstract

This is a response to Robert Cherry's comment on the article, “Welfare as We [Don't] Know It: A Review and Feminist Critique of Welfare Reform Research” that appeared in the 10(2) issue of Feminist Economics. This response argues that while some combination of welfare reform, the booming economy in the late 1990s, and changes in economic policy all worked together to decrease caseloads and increase employment rates among welfare leavers, these are incomplete measures of the impact of welfare reform on the lives of lone mothers. This paper also argues that the effects of welfare reform on lone mothers are more mixed than Cherry acknowledges. This paper concludes that when one holistically examines low-income lone mothers' lives, it is premature to declare welfare reform a success.     

Book review

Tourism Marketing. By Salah Wahab, Jack Crampon, and L. Rothfield. London, England: Tourism International, 1976. 273 pp. U.S. $16.00

Tourism in the Bahamas and Bermuda: Two Case Studies. By Brian H. Archer. Bangor, Wales: University of Wales Press, 1977. Pp. ix, 87. £3.25

Park Planning Handbook: Fundamentals of Physical Planning for Parks and Recreation Areas. By Monty L. Christiansen. New York: John Wiley & Sons, Inc., 1977. Pp. xiv, 413. Hardcover: $18.95

Educating for Leisure‐Centered Living. By Charles K. Bright‐bill and Tony A. Mobley. (2nd Edition—Revised). New York: John Wiley and Sons, 1977. Pp. viii, 128. Paperback: $4.95

Private and Commercial Recreation: A Text and Reference. By Arlin F. Epperson. New York: John Wiley & Sons Publishing Company, Inc., 1977. Pp. 385. Hardcover: $15.95

The Economic Impact of Parks. A report prepared for the Federal/Provincial Parks Conference. By the Canadian Outdoor Recreation Research Committee. Toronto: Ontario Research Council on Leisure, 1975. Pp. 107. $4.50

A Model for Planning and Managing National Parks. By Laurence Prosser. Center of Leisure Studies, University of Oregon, 1977. Pp. 456. $25.00

Delivery of Community Leisure Services: An Holistic Approach. By James F. Murphy and Dennis R. Howard. Philadelphia: Lea & Febiger, 1977. Pp. vii, 219. Paperback: $9.75

Recreation Leadership. 3rd edition. By Maryhelen Vannier. Philadelphia: Lea & Febiger, 1977. Pp. 387. Hardcover: $12.50

Leisure: An Introduction. Edited by Hilmi Ibrahim and Fred Martin. Los Alamitos: Hwong Publishing Company, 1977. Pp. 360

Outdoor Recreation in America: Trends, Problems and Opportunities. 3rd edition. By Clayne R. Jensen. Minneapolis: Burgess Publishing Company, 1977. Pp. 269. Hardcover: $12.95

A Research Study into Provision for Recreation in the Highlands and Islands: Phase 1—Areas Affected by Oil‐Related Development. Research Reports 22, 23, and 31. Tourism and Recreation Research Unit, University of Edinburgh, Scotland, 1976 and 1977. Pp. 339, 411, and 145.

Research Study into Provision for Recreation in the Highlands and Islands: Phase 2—Regional Perspective: A Commentary by J. A. Long, J. T. Coppock, and B. S. Duffield. Research Report 37. Tourism and Recreation Research Unit, University of Edinburgh, Scotland, 1978. 110 pp.

The Environmental Impact of Outdoor Recreation. By Geoffrey Wall and Cynthia Wright. Waterloo, Ontario, Canada: Department of Geography Publication Series, Faculty of Environmental Studies. 1977, 69 pp. $5.00.

Avocational Counseling Manual—A Complete Guide to Leisure Guidance. By Robert Overs, Sharon Taylor, and Catherine Adkins. Washington, D.C.: Hawkins and Associates, Inc., 1977, 203 pp.

Leisure and Recreation: Introduction and Overview. By Clayne R. Jensen. Philadelphia: Lea & Febiger, 1977, 295 pp. Paperback $13.50.

The Joy of Sport. By Michael Novak. New York: Basic Books, 1976. Pp. 358. $10.95     

The development of socially responsible investment in South Africa: experience and evolution of SRI in global markets

Sustainability practices, particularly those relating to Socially Responsible Investment (SRI), have still to be fully evolved in a developing country context. This article considers international trends in SRI and how these may relate to South Africa. It considers how, internationally, SRI has become increasingly motivated by the business case for risk-management and therefore how it may have the potential to offer superior returns (as demonstrated by recent experience in the United States). It examines the relevance of SRI trends to South Africa, where the concept of SRI still faces further structural development, and reviews the performance of funds operating in the South African SRI arena.     

The German model of employee relations on trial: negotiated and unilaterally imposed change in multi‐national companies

This article investigates the effects of negotiated and unilaterally imposed change on employee relations in the German subsidiaries of a Finnish and a German multi‐national company (MNC). We look at how the strategies affect the sustainability of the current German model of employee relations and highlight some of the disadvantages of this model for global MNCs.     

Fostering ethical marketing decisions

This paper begins by examining several potentially unethical recent marketing practices. Since most marketing managers face ethical dilemmas during their careers, it is essential to study the moral consequences of these decisions. A typology of ways that managers might confront ethical issues is proposed. The significant organizational, personal and societal costs emanting from unethical behavior are also discussed. Both relatively simple frameworks and more comprehensive models for evaluating ethical decisions in marketing are summarized. Finally, the fact that organizational commitment to fostering ethical marketing decisions can be accomplished by top management leadership, codes of ethics, ethics seminars/programs and ethical audits is examined. Gene R. Laczniak is Professor of Business at Marquette University. He has written extensively in the field of marketing and business ethics. He is coeditor of Marketing Ethics: Guidelines for Managers, Lexington Books, 1985 and coauthor of The Higher Road: A Path to Ethical Marketing Decisions, Allyn & Bacon, 1992 (both with P. E. Murphy). Professor Laczniak's research interests focus on the social and ethical influence of marketing activities on society as well as marketing strategy. Patrick E. Murphy is Professor of Marketing in the College of Business Administration at the University of Notre Dame. His articles on business and marketing ethics have appeared in several periodicals. He currently serves as editor of Journal of Public Policy & Marketing and is coeditor of Marketing and Advertising Regulation: The Federal Trade Commission in the 1990s, Notre Dame Press, 1990 (with W. L. Wilkie). His research interests focus on the ethical and public policy issues facing business.This article is based on material forthcoming in The Higher Road: A Path to Ethical Marketing Decisions, Allyn & Bacon, 1992.     

Catastrophe Theory: Implications for Probability

ABSTRACT The work of Rene Thom relating to catastrophe theory has influenced probability theory Since so much of the research conducted by social scientists depends on calculating the probability that events will occur, an introduction to catastrophe theory is needed By discussing the social implications of the position outlined by Thom, social scientists will better understand the difficulties associated with generating probability statements