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61.
62.
This study looks at the behavior of self-selected users of an electronic bulletin board system (BBS). Its goal is to investigate the reported lack of social context cues in computer mediated communication contexts. Using participant observation methods, the study demonstrates how BBS users establish online identities. The study also identifies communication leaders who maintain their identities and leadership roles through manipulation of the BBS social context. These findings appear to contradict perspectives that characterize computer-mediated communications as deindividuated (Kiesler et al, 1984).  相似文献   
63.
Myers RJ 《Demography》1966,3(2):545-547
The so-called Medicare program enacted by the 1965 Amendments to the Social Security Act will have a significant impact on demographic studies, in view of the vast amount of previously unobtainable data that will be made available. Not only will there be extensive information in regard to hospitalization and other medical-care costs for persons aged 65 and over (with adequate subdivisions by age and sex) but also reliable data in regard to the true size of the population aged 65 and over will be produced.The reason for this latter result is that virtually all pereons aged 65 and over in the country will become eligible for hospital insurance, even though they may not have been previously covered, or have been survivors of persons covered, under the Old-Age, Survivors, and Disability Insurance System. As a result, not only will there be an accurate count (unlike the census, where the enumeration necessarily is not complete), but also there will be a verification of age, since this is necessary under the claims process.  相似文献   
64.
Environmental Refugees   总被引:3,自引:1,他引:2  
There are fast-growing numbers of people who can no longer gain a secure livelihood in their homelands because of drought, soil erosion, desertification, deforestation and other environmental problems. In their desperation, these environmental refugees—as they are increasingly coming to be known and as they are termed in this paper—feel they have no alternative but to seek sanctuary elsewhere, however hazardous the attempt. Not all of them have fled their countries, many being internally displaced. But all have abandoned their homelands on a semi-permanent if not permanent basis, having little hope of a foreseeable return.  相似文献   
65.
66.
Over the past two decades historians have displayed an increasing interest in the history of black people in Britain. As a result of important recent work much is now known of a group of exceptional black literary figures (Equiano, Sancho, and Cugoano), the ‘leaders’ of the black community, whilst the vast majority of eighteenth and nineteenth century black people remain in anonymity. This anonymity is attributable in part to the paucity of primary source material relating to rank‐and‐file blacks. In order to gain insights into the black community, this article analyses criminal records — a class of records whose value for our purposes is that it focuses essentially on the eighteenth and nineteenth century poor, both black and white.  相似文献   
67.
The procedure of steepest ascent consists of performing a sequence of sets of trials. Each set of trials is obtained as a result of proceeding sequentially along the path of maximum increase in response. Until now there has been no formal stopping rule, When response values are subject to random error, the decision to stop can be premature due to a “false” drop in the observed response.

A new stopping rule procedure for steepest ascent is intro-duced that takes into account the random error variation in response values. The new procedure protects against taking too many observations when the true mean response is decreasing, it also protects against stopping. prematurely when the true mean response is increasing, A numerical example is given which illus-trates the method.  相似文献   
68.
Despite comparatively modest welfare reforms in Canada relative to those of the United States, employment rates and earnings among single mothers have risen by virtually identical magnitudes in the two countries since 1980. We show that most of the gains in Canada and a substantial share of the change in the US were the result of the dynamics of cohort replacement and population aging as the large and better educated baby boom generation replaced earlier cohorts and began entering their forties. In both countries, demographic effects were the main factor accounting for higher employment and earnings among older (40+) single mothers. Changes among younger single mothers, in contrast, were mainly the result of changes in labor market behavior and other unmeasured variables. Overall, demographic changes dominated in Canada but not in the US for two reasons: (a) Canadian single mothers are significantly older than their US counterparts; and (b) consistent with the welfare reform thesis, the magnitude of behavioral change among younger single mothers was much larger in the US.  相似文献   
69.
Black history has witnessed an upsurge in historical interest from the 1970s onwards. However, significant developments have been impaired by the lack of direct black testimony and the paucity of information in general. Thus, scholarship has concentrated on a triumvirate of black literary figures and on the abolition of slavery. New dimensions and departures have been achieved by the work of Duffield, Lorimer and Braidwood; nevertheless, there remain identifiable areas in which our knowledge is deficient. One of the most important is that of black economic survival in white society, which has received only cursory attention. The aim of this study is to reconstruct black occupational structures and examine strategies of survival during the period 1780 to 1830.

This reconstruction of black socio‐economic groupings and employment patterns identifies complexities that were previously obscured. Important distinctions between the free and enslaved are discernible, especially in the occupations of servant and sailor. To support these conclusions evidence has been quarried from newspapers, parish registers and criminal records and comparisons made with the white population. Occupational structures of black men and women have been analysed and the material has enabled black people in the metropolis to be geographically located. Furthermore, the results reinforce the young male dominance of the black population as gender ratios and ages are distinguished.

By adopting a ‘history from below’ approach, attention has finally been diverted away from an elitist group of articulate black men and the issues of abolition towards an analysis of ‘rank and file’ black men and women, and will assist those in search of black roots.  相似文献   
70.
Political public relations play an unique role in American democracy because it occupies a dual role of providing both political and commercial speech. However, using analysis of the First amendment, public relations have increasingly been identified as commercial speech which receives limited protection under the U.S. Constitution. This study traces the evolution of the legal framework in which political PR has become associated with commercial speech, and how this association has made Constitutional analysis of political PR more complex. Implications for public relations practitioners and PR's role in democracy are discussed.  相似文献   
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