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深圳市线路板蚀刻废液中铜、砷、铅、汞、镉含量调查   总被引:2,自引:0,他引:2  
对深圳市60家线路板企业含铜蚀刻废液中铜、砷、铅、汞、镉含量的检测结果显示:酸、碱性蚀刻废液铜含量范围分别为38.6~167.9g/L、53.7~171.8g/L,,通过测量比重推算铜含量适用于碱性废液但不适合酸性废液.56个样品可检出砷(大于3mg/L).56个样品未检出铅(小于5mg/L),其余4个铅含量偏高.所有样品汞、镉均未检出,含量分别小于4mg/L、0.3 mg/L.将各样品砷、铅、汞、镉含量实测值换算为铜含量100ga.时的相对值后发现,上述四元素在蚀刻废液中的正常值分别为<12mgAs/L、<5 mg Pb/L、<4 mg Hg/L、<0.3 mg Cd/L.  相似文献   

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This paper examines the impact of aging in the Republic of Korea on productivity as measured by labor productivity or total factor productivity (TFP). It also assesses the effect of robot adoption on the relation between aging and productivity using industrial level data. We find that aging is negatively associated with labor productivity and TFP growth. This is true particularly when aging is measured by increases in shares of old workers. If aging is measured by increases in the median age of workers, the negative effect is weaker. Evidence also suggests that robot technology mitigates aging's negative effect on productivity growth, particularly when productivity is measured by TFP. However, there is no evidence that robots are more heavily adopted in aged industries. While robot technology does not directly contribute to higher productivity growth, our findings suggest that the robot adoption can alleviate the negative impact of aging by helping workers in their 50s and 60s contribute less adversly to productivity growth.  相似文献   

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This paper studies how industry specialization, diversification, and churning affect unemployment rates in Chinese cities. Using a city level panel data set from 1997 to 2006, we find that in contrast to the evidence from developed countries, industry diversity is positively and significantly associated with unemployment rates, possibly due to the high degree of industry churning during the sample period. We also find that the specialization of construction industry and wholesale and retail trade industry can significantly decrease unemployment rate, but specializing in finance industry increases unemployment rate. Urban growth, market maturity measured by the proportion of private sector employment, and human capital can decrease unemployment rate. The effect of industry structure on unemployment instability is also discussed.  相似文献   

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This study probes into the relationships among personality traits, leadership behavior, and job stress in nurses in Yunlin, Taiwan. The major questions addressed are as follows: What model precisely portrays the relationships among personality traits, leadership behavior, and job stress? Exploration of the causal pathways among these variables revealed a suitable model. A structured, self-administered questionnaire with three scales was distributed to the subjects. The questionnaires were submitted to 350 nurses and 284 questionnaires were completed accounting for a response rate of 81.1 percent. The data were analyzed by statistic analysis including frequencies, means, path analysis using computer program SPSS for windows 14.0 and LISREL 8.7. Results demonstrated a significant, direct, and positive effect of personality traits on leadership behavior, as well as a significant negative indirect effect of personality traits on job stress through leadership behavior was also revealed in the findings. All paths in the model were significant (P〈0.1). After the analysis of LISREL, the suitability of the framework was fine and proved that the model was applicable for the research. The results of this study will be used as a reference to develop strategies for human resource management.  相似文献   

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This paper studies the evolution of regional specialization in China in response to trade liberalization. Using a panel of Chinese export data at the detailed commodity level over the period of 1988–2006, we show that China’s regional specialization follows a U-shaped pattern: both the interior and coastal regions diversify from 1988 to 1994 but specialize during the later reform period of 1994–2006. A theory of tariff reductions is proposed by constructing the Dornbusch–Fischer–Samuelson (1977) continuum of goods Ricardian model in a setup of two countries and three regions. The U-shaped pattern of specialization can be obtained from foreign tariff reductions followed by Chinese tariff reductions. This finding is supported by simulations, US–China trade policy review, and the pattern of China’s coast–inland wage ratio.  相似文献   

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《World development》1999,27(3):533-550
The factors driving global integration, namely, trade expansion, technological change, and the internationalization of production have altered production patterns and changed the composition of output in both developed and developing countries. As global patterns and modes of production have changed there has been a general shift away from agriculture toward industry and services. Along with these output changes have come significant changes in regional and national employment. In developing and developed countries, these changes span divergent trends. On the one hand, there is the increased availability of more and better quality employment as workers shift out of agriculture and subsistence production and into waged employment in the expanding manufacturing and service sectors. On the other hand, there have been sectors where the trend has been away from formalization toward the informalization and semi-formalization of production activities and employment practices. Women have generally benefited from improvements in the world economy. This article demonstrates, however, that patterns of employment and income generation among women often diverge, however, from global trends in important ways that suggest that the forces shaping global integration effect women differently. The article frames a policy discussion that the International Center for Research on Women led to debate the implications of recent trends in women's employment in the developing and developed world. The six articles in this section represent this discussion. They span a range of empirical and theoretical inquiry, exploring global employment trends and highlighting changes in women's participation in formal and informal economic activities.  相似文献   

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Prostitution is a multi‐billion dollar, globally distributed, low‐concentration service industry that is receiving increasing attention in the economics literature. This article focuses on a widespread, but little studied, feature of this environment—the role of intermediaries (pimps or brothel owners) on market outcomes. Prostitution laws and markets are perhaps unique in that transactions between principals (prostitutes and johns) are legal in many countries, while intermediary activity (pimping) is illegal. After surveying the varying cross‐country legality of agents we develop a simple theoretical model to analyze how the presence or absence of intermediaries shifts the distribution of market surplus. We show that eliminating pimps and brothels may shift surplus in non‐obvious ways, depending on the precise function they perform and on whether equilibrium is pooling or separating across “high quality” and “low quality” market segments. The implications of alternative policy regimes (intermediaries legal or illegal) are considered.  相似文献   

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We explore the interactions between exchange rate and fiscal policy, and default on external debt. Exchange rate policy affects the supply of short-term debt facing the government. Under a conventional soft peg, it can be optimal for the government to set the exchange rate at a level in which partial default occurs. In this case multiple equilibria exist, with one featuring high interest rate, overvalued exchange rate, low level of output, and default. Default is also an equilibrium under a hard peg, precisely because devaluation is not an option. Under a hard peg, however, there is a unique equilibrium.
Peter MontielEmail:
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《World development》1986,14(7):839-852
This study tests several hypotheses about self-employment in LDCs that derive from the common view of the self-employed as part of the informal sector of a dualistic labor market. The empirical findings based upon Malaysian survey data reject the hypotheses that the self-employed earn less than wage employees, ceteris paribus, and that the self-employed in urban areas are typically recent migrants. An alternative interpretation of the determinants of self-employment is suggested based upon these findings.  相似文献   

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This article examines the early development of specialized retail shops in early modern London. It argues that apothecaries' shops were sites of innovative shop design and display. These practices were responses to attitudes to consumption, the problematic nature of the medical commodities which apothecaries sold, and, particularly, contemporary concerns about their reliability, trustworthiness, and honesty. The article concludes that analyses of the rise of the shop need to be revised to incorporate early developments by producer-retailers, such as apothecaries and goldsmiths, and suggests that investments in retailing were driven more by worries about commodities than enticing customers.  相似文献   

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In a formerly monopolized industry now subject to competition,there is likely to be considerable interaction between businessstrategy and regulation. The paper illustrates the developmentof this process in UK telecommunications. It sets out a frameworkin which competition between incumbent and entrants takes theform of a race on the part of the former to bridge the innovationgap and on the part of the latter to accumulate the necessarystrategic assets, including regulatory assets. The strategiesof major UK fixed-link telecommunications firms are analysedin this light, and regulatory policy towards vertical separationin mobile telephony is also described. The article draws attentionto the crucial role which the regulator plays in assisting entrantsto gain access to strategic assets, including information.  相似文献   

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This paper explores how fiscal incentives offered to local governments in China affect investment rates in their jurisdictions. Theoretically, we build a simple fiscal competition model to establish the linkage between local fiscal incentives and expenditure policy and consequently, capital movement. The key prediction of the model, borne out by data from Chinese provinces spanning 2004–2013, is that an increase in the local corporate income tax-sharing ratio, which proxies fiscal incentives offered to local governments, motivates local governments to compete for capital investment through increased public expenditure. Our results contribute to the literature on both fiscal federalism and state capacity by showing that local fiscal incentives significantly shape policy choices and local economic performance. In addition, by exploring fiscal incentives offered to local governments, we offer a novel explanation for the unusually high investment rate in China that has been sustained over a prolonged period.  相似文献   

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