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221.
Objectives
The aim of this paper is to respond to the commentary of Peter K. Smith, Christina Salmivalli, and Helen Cowie (Journal of Experimental Criminology, 2012), who raise concerns regarding some of the findings of our systematic review and meta-analyses on the effectiveness of bullying prevention programs. They target three findings in particular: (1) the significant association of ??Work with Peers?? with greater victimization; (2) the significant association of ??Disciplinary Methods?? with less bullying perpetration and victimization; and (3) the age variations in effectiveness, suggesting larger effect sizes for older age students.Methods
We provide explicit information and further detailed analyses on the relationship between these features and effect sizes, including heterogeneity tests and results from weighted regression analyses. For one element in particular (work with peers), we present further research findings from evaluations conducted by Smith, Salmivalli, and Cowie (and also findings from other independent researchers) which support our previous findings. New within-program analyses to examine variations in effect sizes with the age of the students are also presented.Results
Evaluations conducted by Smith, Salmivalli and Cowie (and by other independent researchers) indicate the same research conclusions: although peer support schemes appear effective based on attitudinal surveys, these schemes are not related to actual levels of bullying or victimization and, in fact, are quite often related to an increase in bullying and victimization. Our definition of ??disciplinary methods?? did not include the zero-tolerance approach or any type of harsh discipline as suggested in the commentary. In all relevant cases, ??disciplinary methods?? included sanctions within a warm and loving framework, following the Olweus bullying prevention guidelines. While most programs that utilized firm disciplinary methods were inspired by Olweus, the relationship between disciplinary methods and less victimization was not driven by the Olweus program (which was not related to the victimization effect size). Larger effect sizes (i.e. reductions in bullying and victimization) for programs implemented with older students is a robust result also found in a more recent systematic review regarding the effects of anti-bullying programs on bystander intervention. In within-program analyses, most results suggested that effect sizes were greater for younger students, but these results were driven by the less controlled evaluations. The most controlled evaluation (randomized experiment) provided the opposite result.Conclusions
More research is clearly needed on the effectiveness of bullying prevention programs with students of different ages, and we also recommend randomized experiments to assess the importance of different intervention components. 相似文献222.
223.
This note summarises our replication study ‘Housing, Health, and Happiness’, henceforth HHH2009, which constitutes an important paper in the literature of housing and slum upgrading. The original authors conduct a quasi-experimental impact evaluation of ‘Piso Firme’, an intervention that replaced in-house dirt floors with cement in Mexico. We conduct a Pure Replication (PR), a Measurement and Estimation Analysis (MEA), and a Theory of Change Analysis (TCA). In our PR, we did not find any major discrepancy with the original study. In the MEA, we generally find the results to be strongly robust to different types of alternative analysis. Finally, in TCA we explore a dimension that was not reported on the published version of the study and found that households with high initial levels of cement-floor coverage benefitted significantly less from Piso Firme’s intervention. These findings are discussed in greater detail on International Initiative for Impact Evaluation’s (3ie) working paper version. 相似文献
224.
Maria Papadakis 《Journal of policy analysis and management》1994,13(1):1-20
Much policymaking in the 1980s at the federal, state, and local levels tried to redress the U.S. competitiveness crisis. A guiding presumption was that there was a sudden and profound inability of the United States to compete in manufactured goods. However, there has been little systematic analysis of American competitive performance disaggregated for the entire manufacturing sector. Data analyzed here for the years 1970–1990 and for the 24 major two-and three-digit ISIC industries reveals that there was a competitiveness crisis in the 1980s, but it was not endemic to all industries. Market share, trade balance, and revealed comparative advantage indicators suggest the crisis was characterized by intensified competitive decline for the auto, textiles, and electronics, industries, and by competitive reversals for the electrical machinery and office and computing machine industries. While many other major American industries appear to be in competitive health, the cumulative effect of macroeconomic imbalances is likely to cause future competitive stress in the capital goods and high-technology sectors. 相似文献
225.
Griffith Michael A. Dubow Eric F. Ippolito Maria F. 《Journal of youth and adolescence》2000,29(2):183-204
In this study, we investigated developmental and cross-situational differences in strategies adolescents use to cope with family, school, and peer stressors. We also examined the relation between adolescents' use of coping strategies and two indices of adjustment (self perceptions of their adjustment as a result of coping with the specific stressor and state anxiety). The sample included 148 seventh graders, 124 ninth graders, and 103 twelfth graders (n = 375). Approach coping increased across the three grade levels, especially in relation to family and peer stressors. Adolescents used more avoidance than approach coping strategies for family stressors, and more approach than avoidance strategies for school and peer stressors. Across stressors, approach coping predicted more favorable outcomes and avoidance coping predicted less favorable outcomes. Coping strategies in response to a specific stressor were more strongly predictive of stressor-specific adjustment than state anxiety, suggesting the need to include both stressor-specific and global measures of adjustment in assessing the relation between coping and adjustment. 相似文献
226.
Firrao D Matteis P Scavino G Ubertalli G Ienco MG Pellati G Piccardo P Pinasco MR Stagno E Costanza G Montanari R Tata ME Brandimarte G Petralia S 《Journal of forensic sciences》2006,51(3):520-531
Evidence of exposure of a metal component to a small charge explosion can be detected by observing microstructural modifications; they may be present even if the piece does not show noticeable overall plastic deformations. Particularly, if an austenitic stainless steel (or another metal having a face-centered cubic structure and a low stacking fault energy) is exposed to an explosive shock wave, high-speed deformation induces primarily mechanical twinning, whereas, in nonexplosive events, a lower velocity plastic deformation first induces slip. The occurrence of mechanical twins can be detected even if the surface is damaged or oxidized in successive events. In the present research, optical metallography (OM) and scanning electron microscopy (SEM), and scanning tunneling microscopy (STM) were used to detect microstructural modifications caused on AISI 304Cu steel disks by small-charge explosions. Spherical charges of 54.5 or 109 g TNT equivalent mass were used at explosive-to-target distances from 6.5 to 81.5 cm, achieving peak pressures from 160 to 0.5 MPa. Explosions induced limited or no macro-deformation. Two alloy grain sizes were tested. Surface OM and SEM evidenced partial surface melting, zones with recrystallization phenomena, and intense mechanical twinning, which was also detected by STM and X-ray diffraction. In the samples' interior, only twins were seen, up to some distance from the explosion impinged surface and again, at the shortest charge-to-sample distances, in a thin layer around the reflecting surface. For forensic science locating purposes after explosions, the maximum charge-to-target distance at which the phenomena disappear was singled out for each charge or grain size and related to the critical resolved shear stress for twinning. 相似文献
227.
228.
The postmortem diagnosis of shaken baby syndrome, a severe form of child abuse, may be difficult, especially when no other visible signs of significant trauma are obvious. An important finding in shaken baby syndrome is subdural haemorrhage, typically originating from ruptured cerebral bridging veins. Since these are difficult to detect at autopsy, we have developed a special postmortem computed tomographic (PMCT) method to demonstrate the intracranial vein system in infants. This method is minimally invasive and can be carried out conveniently and quickly on clinical computed tomography (CT) systems. Firstly, a precontrast CT is made of the infant's head, to document the original state. Secondly, contrast fluid is injected manually via fontanel puncture into the superior sagittal sinus, followed by a repeat CT scan. This allows the depiction of even very small vessels of the deep and superficial cerebral veins, especially the bridging veins, without damaging them. Ruptures appear as extravasation of contrast medium, which helps to locate them at autopsy and examine them histologically, whenever necessary. 相似文献
229.
Testa M 《Journal of interpersonal violence》2004,19(12):1494-1505
Literature addressing the relationship between substance use and physical and sexual violence against women is reviewed briefly. There is substantial evidence of a relationship between men's substance use and perpetration of physical violence, some evidence of a relationship between women's substance use and experiences of sexual aggression, but weak evidence that men's substance use contributes to sexual aggression or that women's substance use contributes to their physical victimization. Understanding the mechanisms underlying the relationship between substance use and violence relationship will be facilitated by narrowing the scope of research questions to identify for whom there is a relationship and under what circumstances. 相似文献
230.
This paper evaluates the use of climate-based information in drought mitigation in Ceará, Northeast Brazil. It examines two policies – a seed-distribution program (Hora de Plantar) and the Emergency Drought-Relief Program – that use climate information produced by FUNCEME (Cearás Foundation for Meteorological and Hydrological Resources) to implement drought planning. It argues that, in politically charged policy-making environments, the use of climate forecast information may go beyond its problem-solving function to influence broader issues of accountability and democratization. In Cearás politically charged environment, technocrats rely on scientific information about climate to insulate policy-making from both political meddling and public accountability. However, insulation afforded by the use of climate information has played different roles in the policy areas examined in this study. While in drought emergency-relief planning the use of climate information critically contributed to the democratization of policy implementation, in agricultural planning, it worked towards further insulating decision-making from public accountability and client participation. Thus, the use of climate information is context-dependent, that is, the distribution of costs and benefits associated with information use in policymaking depends on the social, political, and cultural context in which information producers and users work. Moreover, climate information can be used in ways – positive or negative – significantly different from the use that information producers intended. 相似文献