U.S. Aviation Regulations Increase Probability of Midair Collisions

A purely stochastic Monte Carlo model is used to compare the relative midair collision course probabilities and mean closing velocities of four systems of rules for aircraft cruising altitudes as a function of altitude error: (1) current U.S. federal rules, (2) random altitudes, and (3) two proposed alternatives to the current rules. This model increments error while: (1) counting collisions among cruising pairs of aircraft following the four rules being tested on random headings between randomly placed airports, and (2) calculating mean closing velocities for each rule. The calculations verify that: (1) federal rules increase collision course probabilities by about four times more than for a chaotic system of aircraft cruising at randomly selected altitudes, (2) risk is directly proportional to the level of compliance, and (3) mean closing velocities resulting from the current rule are slightly less than for random altitudes, while being almost twice as high as for the proposed rules. High closing velocities are shown to increase the collision probability.     

Emerging trends in US retailing

This article examines the trends shaping the retail environment as we enter the next century. A modified delphi approach was used to access managerial perceptions of the changing retail landscape. Changes in consumer markets, price and branding strategy, store formats, retail institutions and applications of technology were derived from the analysis. From this, a series of managerial considerations are proposed to focus retail managers on developing new strategies to position themselves effectively in the new global marketplace.     

Estate Inheritance: A Sociological Lacuna*

Estate inheritance, a frequently mentioned but rarely examined feature of stratification systems, has been a neglected area of research in sociology. In this paper, several possible causes of the sociological neglect are discussed. The treatment of inheritance patterns in functionalist and conflict theories of stratification is analyzed, and an overview of existing research on inheritance is presented. Finally, a conflict theory of stratification that incorporates the phenomenon of inheritance is proposed, and avenues for further research are suggested.     

The Emergence of Environmental Sociology: Contributions of Riley E. Dunlap and William R. Catton, Jr.

Human beings have a dualistic relationship with the environment, being subject to physical and biological limits and yet being unique in the capacity for culture and symbolic communication. Sociology reflects this context and adds another dualism, drawing heavily from the concepts and perspectives of biological ecology, but reacting almost violently against "reductionism" of any sort, specifically including social Darwinism and environmental determinism. During much of the twentieth century, the predominant trend within sociology was for scholars to downplay or even ignore the importance of the environment, particularly in the United States. This trend was ultimately counterbalanced by sociological responses to the environmental movement of the late 1960s and early 1970s and by the efforts of selected sociologists-particulady Riley Dunlap and William Catton-who helped bring together the field of "environmental sociology." Given the finite nature of many natural resources and the ways in which human activities depend upon and affect the environment, the field of environmental sociology is likely to be an increasingly important one in the years to come.     

What sounds beautiful is good: The vocal attractiveness stereotype

Two studies examined the effects of attractiveness of voice and physical appearance on impressions of personality. Subject-senders were videotaped as they read a standard-content text (Study 1) or randomly selected texts (Study 2). Judges rated the senders' vocal attractiveness from the auditory portion of the tape and their physical attractiveness from the visual portion of the tape. Other judges rated the senders' personality on the basis of their voice, face, or face plus voice. Senders with more attractive voices were rated more favorably in both the voice and face plus voice conditions; senders with more attractive faces were rated more favorably in both the face and face plus voice conditions. The effects of both vocal and physical attractiveness were more pronounced in the single channels (voice condition and face condition, respectively) than in the multiple channel (face plus voice condition). Possible antecedents and consequences of the vocal attractiveness stereotype are discussed. p]Her voice was ever soft, gentle, and low, an excellent thing in woman.Shakespeare (King Lear, Act V, Sc. 3)This research was supported in part by National Institute Mental Health Grant RO1 MH40498-01A2. The authors would like to thank Thomas J. Hernandez, James R. Laguzza, Andrea Lurier, and Mary Elizabeth Sementilli for running the videotaping sessions in Study 1, and Craig B. Partyka, Kimberly A. Radoane, and Kelly B. Sanborn for running the videotaping sessions in Study 2. Grateful acknowledgment is extended to Kate Johnson and Michael Zygmuntowicz for running rating sessions in Study 2, to BiancaMaria Penati for running rating sessions and coding data in Study 2, and to Bradley C. Olson for his assistance with data analysis.     

WHY LABOR WINS, WHY LABOR LOSES:

Legal regulation of the labor contract is central to American policy formation. This study analyzes the reasons for the passage of federal labor laws that governed workplace activity in the United States from 1897 to 1980. The dependent variable includes all major federal statutes that are favorable or detrimental to labor. Two theories are considered: a mass disruption approach and a party control perspective. Qualitative comparative analysis is used to assess the utility of both theories. For the pro-labor laws, the findings show partial support for both models. The theories are better at explaining reform prior to rather than after World War II. An explanation is presented for this temporal break. For the antilabor laws, the results are inconclusive due to the small sample size. An alternative account is offered that focuses on policy making under divided government. This research suggests analyzing the interaction of economic, class, and political variables and using larger sample research designs as guidelines for future investigation.     

Institutional Change and Coproduction of Public Services: The Effect of Charter Schools on Parental Involvement

Recent discussions of school choice have revived arguments thatthe decentralization of governing institutions can enhance thequality of public services by increasing the participation ofintended beneficiaries in the production of those services.We use data from the Schools and Staffing Survey to examinethe extent to which the decentralization of authority to charterschools induces parents to become more involved in their children'sschools. We find that parents are indeed more involved in charterschools than in observationally similar public schools, especiallyin urban elementary and middle schools. Although we find thatthis difference is partly attributable to measurable institutionaland organizational factors, we also find that charter schoolstend to be established in areas with above-average proportionsof involved parents, and we find suggestive evidence that, withinthose areas, it is the more involved parents who tend to selectinto charter schools. Thus, while the institutional characteristicsof charter schools do appear to induce parents to become moreinvolved in their children's schools, such characteristics areonly part of the explanation for the greater parental involvementin charter schools than in traditional public schools.