In this paper we discuss relationship between export diversity and economic performance, focusing on Brazil, China, India and South Africa (BCIS). Using time data on exports over the period 1962?C2000 and Applied General Equilibrium (AGE) models for each country, we note the similarities as well as differences in the patterns of diversification in these countries. We find evidence of a U-shape relationship between per capita income and export specialization in at least China and South Africa, and given that the results from Granger causality testing are inconclusive and not robust with regards to export diversification measures, some preliminary evidence from the results suggest that export diversification Granger causes GDP per capita in Brazil, China and South Africa, but not in India, where it is rather GDP per capita changes that are driving export diversification. From AGE modeling we find that South Africa differs from the other economies in that it is the only case where export diversification has an unambiguously positive impact on economic development while in contrast in Brazil, China and India, it is rather export specialization that is preferred. We show that the manner in which export diversification is obtained may be important: if it is obtained with less of a reduction in traditional exports, the impacts are better (less negative). 相似文献
Discrete choice recently emerged as a new framework for analyzing criminal location decisions, but has thus far only been
used to study the choice amongst large areas like census tracts. Because offenders also make target selection decisions at
much lower levels of spatial aggregation, the present study analyzes the location choices of offenders at detailed spatial
resolutions: the average unit of analysis is an area of only 18 residential units and 40 residents. This article reviews the
discrete choice and spatial choice literature, justifies the use of geographic units this small, and argues that because small
spatial units depend strongly on their environment, models are needed that take into account spatial interdependence. To illustrate
these points, burglary location choice data from the Netherlands are analyzed with discrete choice models, including the spatial
competition model. 相似文献
In this study, changes in three conflict resolution styles in parent–adolescent relationships were investigated: positive
problem solving, conflict engagement, and withdrawal. Questionnaires about these conflict resolution styles were completed
by 314 early adolescents (M = 13.3 years; 50.6% girls) and both parents for four consecutive years. Adolescents’ reported use of positive problem solving
increased with mothers, but did not change with fathers. Fathers reported an increase of positive problem solving with adolescents,
whereas mothers reported no change. Adolescents’ use of conflict engagement was found to temporarily increase with mothers,
but showed no change with fathers. Mothers and fathers reported a decrease in conflict engagement with adolescents. Adolescents’
use of withdrawal with parents increased, although this increase was temporarily with mothers. Mothers reported no change
in withdrawal, whereas fathers’ use of withdrawal increased. Generally, we found that both adolescents and their parents changed
in their use of conflict resolution from early to middle adolescence. These results show that conflict resolution in parent–adolescent
relationships gradually change in favor of a more horizontal relationship. 相似文献
In this study, the cartridge case ejection patterns of six different Glock model pistols (one specimen per model) were compared under three conditions: firing with a loaded magazine, an empty magazine, and without magazine. The distances, covered by the ejected cartridge cases given these three conditions, were compared for each of the six models. A significant difference was found between the groups of data for each of the tested specimens. This indicates that it is important that, to reconstruct a shooting scene incident based on the ejection patterns of a pistol, test shots are fired with the same pistol type and under the correct magazine condition. 相似文献
Traditional views regard secrecy as problematic, and associated research among adults almost exclusively focuses on its physical and psychological disadvantages for the secret-keeper. Contrary to this negative view on secrecy, this paper proposes that secrecy may have developmental functions that bear particular importance in the period of adolescence. Specifically, it should be associated with adolescents' feeling of emotional autonomy. A cross-sectional study was conducted to examine the links between secrecy and psychosocial well-being and emotional autonomy among 227 younger (12–13 years) and older (16–18 years) adolescents. Results showed that keeping secrets from parents is associated with physical and psychological disadvantages in adolescence. Confirming the prediction, however, secrecy was also related to adolescents' emotional autonomy. The theoretical and empirical implications of our findings are discussed in the context of adolescent development. 相似文献
Adequate pricing of environmental goods is essential for the sustainable management of natural resources. It is not easy, however, to place a value on natural resources, because the excludability problem makes it difficult to protect natural resources from unpaid use and to exercise property rights over them. This article discusses the achievements and limitations of current natural-resource policies from the perspectives of efficiency and equity. It argues that a trust fund operating via market-based transactions is a promising approach to help to achieve simultaneously the goals of efficiency, sustainability, and poverty reduction, provided that property rights to the environmental resources are distributed fairly within current generations, as well as between present and future generations. 相似文献
Free fluorescent dyes from PCR primers or amplification products can interfere with the interpretation of STR alleles in an electropherograph especially when the profiles have a low signal intensity. These artefacts can be removed by using a simple procedure based on BigDye® XTerminator™. This procedure requires limited amounts of PCR product, allows to do several loadings on a capillary sequencer starting from the same purified PCR product and also increases the sensitivity for detection of less amplified loci. 相似文献
The influence of muzzle instability on bullet deflection, when perforating laminated particleboards, was studied with three different handgun bullet types. The mean deflection angles of .32 Auto FMJ and .38 Special SJHP bullets were calculated to be 0.90° and 0.83°, respectively after perforating particleboards orthogonally at a 1 m muzzle-to-target distance. The mean angles dropped to 0.70° and 0.58° at a 15 m muzzle-to-target distance. The differences in deflection angles proved to be statistically significant (p <0.05) with p-values of 0.023 and 0.001, respectively. The mean calculated deflection angles of .38 Special LRN bullets also dropped from 1.51° to 1.38° when the muzzle-to-target distance was increased from 1 to 15 m, but this difference was not significant (p-value of 0.357). The results support the hypothesis that muzzle instability has an influence on deflection. The possible implications for shooting incident reconstructions and for future research are discussed. 相似文献
Although the oxytocin receptor gene (OXTR) is involved in aggression and social affiliation, it has not been examined in gene-environment interaction studies. This longitudinal study examined the effect of genetic variants in OXTR and its gene-environment interaction with perceived deviant peer affiliation in the trajectories of antisocial behavior in 323 adolescents (182 males) from 13 to 18 years. Annual assessments of reactive and proactive aggression, delinquency, and friends’ delinquency, as well as DNA at age 17 were collected. Gene-based tests yielded no main effect of OXTR, but revealed a significant gene-environment interaction in proactive aggression and delinquency. Variation in the OXTR might affect the influence of deviant peer affiliation on antisocial behavior, contributing to a better understanding of individual differences in antisocial behavior.
AbstractThis article explores how the retrenchment of the Russian welfare state has affected Russians’ attitudes towards it. Using European Social Survey data, we find that the retrenchment has not eroded Russians’ strong preference for a comprehensive system, despite their dissatisfaction with its outcomes. Further, we find that in Russia, some of the individual socioeconomic characteristics have a different effect on people's attitudes to social welfare compared to equivalent groups in EU countries. Overall, as in the EU, attitudes are multidimensional: a positive stance towards some aspects of the welfare state coexists with a critical approach towards others. 相似文献