关于约数和函数的一个方程

对于正整数k,设σ(k)是k的约数和函数.本文运用初等数论方法证明了:方程σx(1+[y/x])+σy(1+[x/y])=2·3 [(x+y)/2]仅有正整数解(x,y)=(t,t),其中t是任意正整数.     

The role of teacher behavior in adolescents’ intrinsic reading motivation

Given the weak intrinsic reading motivation of many adolescents on the one hand and the importance of this type of motivation for reading competence on the other hand, the aim of the present study is to identify the related role of teacher behavior. To pursue this aim, a secondary analysis was carried out on PISA 2009 data. More particularly, data of a subsample of 4,269 Flemish 15-year olds were examined by means of multilevel modeling. In line with self-determination theory, the results provide evidence for the significance of perceived autonomy-supportive, structured, and involved teacher behavior. Teacher involvement was most strongly associated with adolescents’ intrinsic reading motivation. Further, students’ perception of teachers’ autonomy support was particularly related to girls’ intrinsic reading motivation.     

Cable and New Media

Cable Television in Canada ((January 1971)

Public Announcement: The Integration of Cable Television in the Canadian Broadcasting System (February 26, 1971)

Canadian Broadcasting “A Single System”: Policy Statement on Cable Television (July 16, 1971)

Joseph Newman (directing editor), Wiring the World: The Explosion in Communications (Washington, D.C.: U.S. News & World Report, 1971—$2.95, paper)

Herbert W. Meyer's A History of Electricity and Magnetism (Cambridge, Mass.: MIT Press, 1971—$10.00)     

Film Theory and Criticism

William T. Pilkington and Don Graham, eds., Western Movies (Albuquerque: University of New Mexico Press, 1979–$13.95/$6.95)

William R. Meyer, The Making of the Great Westerns (New Rochelle, New York: Arlington House, 1979 – $20.00)

Michael Pitts, Famous Movie Detectives (Metuchen, New Jerseys Scarecrow Press, 1979 – $11.95)

Gerald Mast's The Comic Mind (Chicago: The University of Chicago Press, 1979– $7.95 paper)     

A rules‐based study of television's role in the construction of social reality

A qualitative analysis of one couple's conversational uses of mediated content is presented. Observations spanned a two‐year period. Data were categorized according to usage type and then examined from Lull's (1981) rules persective.     

Media violence research: Interpreting the findings

The pages which follow are an attempt to stand back and assess what we know about the effects of media violence in an effort to sort into a usable pattern the results of hundreds of reported studies. Timothy P. Meyer is assistant professor of speech in Mass Communications at the University of Massachusetts, Amherst; James A. Anderson is associate professor of radio‐television and director of the Broadcast Research Center at Ohio University, Athens.     

Promoting gun trigger-lock use: insights and implications from a radio-based health communication intervention

A radio public service announcement (PSA) focusing on the danger to children from an unlocked and loaded gun was designed and aired 340 times on three radio stations in one Michigan county. At the end of the message, individuals were given a toll-free number to call to receive a free gun trigger-lock. Three surveys were used to assess the effectiveness of this intervention: a general population telephone survey, an automated telephone survey, and a follow-up mail survey. Approximately 20 percent of individuals in the general population heard the PSA. There was a significant increase in uncued knowledge of the locking-related gun-safety practices in the treatment county between time one and time two. Further, individuals in both counties had very high levels of self-efficacy and response efficacy, moderate levels of perceived severity, and very low levels of perceived susceptibility at both points in time. Seven-hundred and ninety-nine individuals called the toll-free number to receive a free gun trigger-lock; or approximately 17 percent of gun-owning households exposed to the message. The majority of callers were males who owned guns primarily for hunting purposes and who planned to use the lock themselves. Follow-up survey results indicated that individuals were using the gun trigger-locks, and that they believed using gun trigger-locks was an easy and effective way to prevent gun injuries. Insights and practical implications of these findings are discussed.     

Twenty Years of Media Education in France

Abstract

It is salutary to be reminded that in some countries the struggle to establish the study of the media has a much longer history than we sometimes imagine. Here Rosemarie Meyer of the Institut National de Recherche Pedagogique in France looks back over the growth of media studies and traces its roots.