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Carmel U. Chiswick 《Economics of Education Review》1984,3(2):121-130
Education policy is viewed as affecting the content, and hence production functions, of different types of training and skill-formation. The relationship between skill type and level of education is considered. Optimal investment requires equating rates of return on the extensive and intensive margins, making endogenous the trade-offs between quantity and quality for each skill type. Selected education production functions are discussed with respect to implications for the distribution and levels of different skills and for skill-related earnings differentials. Equality of educational opportunity increases skill levels, upgrades the occupational structure and reduces relative earnings differentials. 相似文献
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Marina Dabić Tugrul U. Daim Zoran Aralica A. Elvan Bayraktaroglu 《The Journal of High Technology Management Research》2012,23(1):15-25
The purpose of the paper is to examine the impact of internationalization on innovation. Specifically we explored the impact of internationalization on firms' choice for research and development (R&D) approach and technology source, impact of choice for research and development (R&D) approach and technology source on innovation and finally impact of business hampering factors on innovation. We had focused on innovation intensity to measure impact on innovation. A survey of foreign investment enterprises in Croatia was conducted. A total of 145 firms responded to the questionnaire. Multivariate analyses are used to analyze the data. In addition we identified key factors impacting different types of innovation. 相似文献
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Tunable pores (TPs) have been used for resistive pulse sensing of 1 μm superparamagnetic beads, both dispersed and within a magnetic field. Upon application of this field, magnetic supraparticle structures (SPSs) were observed. Onset of aggregation was most effectively indicated by an increase in the mean event magnitude, with data collected using an automated thresholding method. Simulations enabled discrimination between resistive pulses caused by dimers and individual particles. Distinct but time-correlated peaks were often observed, suggesting that SPSs became separated in pressure-driven flow focused at the pore constriction. The distinct properties of magnetophoretic and pressure-driven transport mechanisms can explain variations in the event rate when particles move through an asymmetric pore in either direction, with or without a magnetic field applied. Use of TPs for resistive pulse sensing holds potential for efficient, versatile analysis and measurement of nano- and microparticles, while magnetic beads and particle aggregation play important roles in many prospective biosensing applications. 相似文献
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Currently, there is a lack of appropriate skill assessments available for use in golf. The aim of this study was to examine the discriminative validity and the test-retest reliability of the newly developed "Nine-Ball Skills Test". Participants of two ability levels (elite, n = 14; high-level amateur, n = 16) each hit nine golf shots of differing combinations of trajectory (straight, fade, draw) and height (normal, high, low) at an individually determined target area. Each shot was scored on its percent error index from the target and whether it achieved the maximum height as required. Participants completed the test twice using a 5-iron club. The elite group scored significantly higher (P < 0.05) than the amateur group for both the first and second rounds of the test as well as the combined scores. The between-round test-retest reliability was deemed to be not acceptable, thus we propose that the test's protocol should include use of the two rounds as standard. Due to the importance of ball striking and flight control to performance in golf, the Nine-Ball Skills Test is appropriate for providing a measure of this skill component in elite and high-level amateur golfers. 相似文献