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121.
Although organizational commitment is a multidimensional construct, researchers have tended to examine the independent effects of its different forms. However, doing so creates potential problems of model misspecification and under‐prediction if interactions exist among different commitments. In this paper we discuss theoretically plausible interactions among different commitments, the patterns of which are expected to vary depending on the nature of the criterion and the foci of commitment. We then test these predictions via empirical data. Results revealed a ‘synergistic’ pattern of effects for discretionary outcomes, such that levels of organizational citizenship behaviour and strain were most favourable when employees reported high levels on multiple commitments. Importantly, no evidence was found for competitive effects between commitments, such that high levels on multiple commitments are detrimental. We discuss the implications of our findings for research and practice. 相似文献
122.
123.
The invertebrate fauna in artificial urban habitats has yet to be systematically investigated. The current field study in
central Ohio was undertaken to assess the numbers and types of macroinvertebrates in mulched and unmulched plots during a
one-year period. Invertebrates quickly infiltrated the plots with bare soil (control) and any of four types of mulch (shredded
hardwood, shredded recycled wood, pine bark mini-nuggets, and pea gravel). One month after establishing the plots, invertebrates
were present in numbers comparable to subsequent months. Invertebrates found in the plots were primarily saprophytic taxa:
millipedes (32.6%), segmented worms (19.8%), isopods (6.7%), and various beetle families (1.5%). Predatory taxa included centipedes
(9.8%), ants (9.7%), carabid beetles and staphylinid beetles (7.3%), and spiders (0.9%). Types of invertebrates were similar
in all ground cover types, but numbers of invertebrates differed significantly. Invertebrates were present year-round in mulched
plots, and plots with organic mulch harbored significantly more invertebrates than plots mulched with pea gravel. Bare soil
always contained the fewest number of invertebrates. There was no significant difference in numbers of invertebrates based
on the cardinal side of the building. 相似文献
124.
Peter Creed Clare TilburyNicholas Buys Meegan Crawford 《Children and youth services review》2011,33(9):1720-1729
We surveyed 202 adolescents who were in out-of-home care, and compared them with 202 adolescents not in care (matched for age, gender and school achievement) on career-related aspirations (occupational aspirations, educational aspirations, life barriers) and career action behaviours (career exploration, career planning). The out-of-home care adolescents reported lower occupational aspirations, less career planning, more career barriers, lower educational aspirations for themselves, lower parental aspirations, and more school engagement. Further, career exploration was lower for out-of-home care children who had higher aspirations, lower self-efficacy, parents who communicated higher aspirations, and low aspiring friends. Results are discussed in the context of providing career development and supports for out-of-home care adolescents so that their career aspirations and behaviours can mirror more normative levels. 相似文献
125.
126.
Land grabbing: a preliminary quantification of economic impacts on rural livelihoods 总被引:1,自引:0,他引:1
Global demands on agricultural land are increasing due to population growth, dietary changes and the use of biofuels. Their effect on food security is to reduce humans’ ability to cope with the uncertainties of global climate change. In light of the 2008 food crisis, to secure reliable future access to sufficient agricultural land, many nations and corporations have begun purchasing large tracts of land in the global South, a phenomenon deemed “land grabbing” by popular media. Because land investors frequently export crops without providing adequate employment, this represents an effective income loss for local communities. We study 28 countries targeted by large-scale land acquisitions [comprising 87 % of reported cases and 27 million hectares (ha)] and estimate the effects of such investments on local communities’ incomes. We find that this phenomenon can potentially affect the incomes of ~12 million people globally with implications for food security, poverty levels and urbanization. While it is important to note that our study incorporates a number of assumptions and limitations, it provides a much needed initial quantification of the economic impacts of large-scale land acquisitions on rural livelihoods. 相似文献
127.
A wide‐held assumption is that increased religiousness is associated with stronger perceptions of a conflict between religion and science. This article examines this assumption using four distinct questions asked on the third wave of the National Study of Youth and Religion (NSYR). Results indicate a variety of viewpoints for constructing the relationship between science and religion, rather than a simple conflict‐compatibility continuum. Further, findings suggest that increased religiousness among emerging adults is associated with a stronger agreement in science and religion’s compatibility, rather than conflict. Incorporating New Age or non‐Western spiritual tradition and a strict adherence to fundamentalist Christian doctrine are associated with complex configurations of beliefs on the relationship between religion and science. Collectively, the findings among emerging adults contradict traditional assumptions about how religious experiences influence beliefs, suggesting that such social factors may influence beliefs and attitudes uniquely at different points in the lifecourse or across generations. More broadly, the findings speak to the ongoing debate about the extent to which differing social experiences may produce consistent or discordant sets of beliefs and values, and in turn how particular configurations may impact strategies of action across a range of life domains. 相似文献
128.
Les B. Whitbeck Kelley J. Sittner Hartshorn Julia McQuillan Devan M. Crawford 《Journal of research on adolescence》2012,22(4):768-781
North American Indigenous adolescents smoke earlier, smoke more, and are more likely to become regular smokers as adults than youth from any other ethnic group, yet we know very little about their early smoking trajectories. We use multilevel growth modeling across five waves of data from Indigenous adolescents (aged 10–13 years at Wave 1) to investigate factors associated with becoming a daily smoker. Several factors, including number of peers who smoked at Wave 1 and meeting diagnostic criteria for major depressive episode and conduct disorder, were associated with early daily smoking. Only age and increases in the number of smoking peers were associated with increased odds of becoming a daily smoker. 相似文献
129.
Clare Tilbury Peter Creed Nicholas Buys Meegan Crawford 《Child & Family Social Work》2011,16(3):345-352
Workforce participation has many positive effects on quality of life. However, as young people in care have generally below‐average levels of educational participation and attainment, they may be ill‐equipped for the transition to further education and work. A mixed‐method study conducted in Australia about career development for young people in care investigated how this population develops ideas about future work: the social and cognitive variables that influence career decision‐making; practices for preparing young people in care for the transition to work or further education; and factors that support or impede the transition. Findings from the qualitative study are reported in this paper. Interview data were obtained from the multiple perspectives of young people in care, foster carers, caseworkers and school personnel. The overall picture was one of young people in care lacking the encouragement, resources and capacity to realistically plan for the job they want. Specific interventions are required to enhance career development and employment outcomes for this population. 相似文献
130.
We consider a dynamic Bertrand game in which prices are publicly observed and each firm receives a privately observed cost shock in each period. Although cost shocks are independent across firms, within a firm costs follow a first‐order Markov process. We analyze the set of collusive equilibria available to firms, emphasizing the best collusive scheme for the firms at the start of the game. In general, there is a trade‐off between productive efficiency, whereby the low‐cost firm serves the market in a given period, and high prices. We show that when costs are perfectly correlated over time within a firm, if the distribution of costs is log‐concave and firms are sufficiently patient, then the optimal collusive scheme entails price rigidity: firms set the same price and share the market equally, regardless of their respective costs. When serial correlation of costs is imperfect, partial productive efficiency is optimal. For the case of two cost types, first‐best collusion is possible if the firms are patient relative to the persistence of cost shocks, but not otherwise. We present numerical examples of first‐best collusive schemes. 相似文献