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在研究的红壤类土壤样品中普遍存在着针铁矿的铝同晶替代作用,供试样品中针铁矿铝替代量为0.14％～27.21％(摩尔百分数),平均为8.77％。红壤亚类、黄红壤亚类和黄壤亚类平均依次为10.32％、9.79％、1.30％,其中红壤、黄红壤亚类与黄壤亚类之间差异明显,这反映了成土条件的差异。土壤中针铁矿的铝替代量与粘粒中铁的游离度正相关,与土壤粉砂粘粒比负相关,说明针铁矿中铝替代量随土壤发育的增加而增加。 相似文献
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This paper contributes to the ongoing debate on the impact of academic patenting on publishing and knowledge transfer. Drawing upon two separate surveys of academics, and their CV information, we provide empirical evidence for UK academics in engineering and physical sciences. The contribution of this paper is two-fold. First, our findings show that (the intensity of) academic patenting complements publishing up to a certain level of patenting output, after which we find evidence of a substitution effect. We also find weak evidence of important differences across scientific fields with the more basic-oriented fields showing indications of a crowding-out effect. Second, our analysis of the potential impact of patenting on knowledge transfer shows a positive correlation between the stock of patents and engagement in knowledge transfer channels. However, we find that a substitution effect sets in, indicating an inverted U-shaped relationship between patenting and several knowledge transfer channels. 相似文献
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Gustavo Leporace Marcio Tannure Gabriel Zeitoune Leonardo Metsavaht Moacir Marocolo Alex Souto Maior 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(3):411-420
AbstractThe aim of this study was to test the correlation between knee-to-hip flexion ratio during a single leg landing task and hip and knee strength, and ankle range of motion. Twenty-four male participants from a professional soccer team performed a continuous single leg jump-landing test during 10s, while lower limb kinematics data were collected using a motion analysis system. After biomechanical testing, maximal isometric hip (abduction, extension, external rotation), knee extension and flexion strength were measured. Maximum ankle dorsiflexion range of motion was assessed statically using the weight bearing lunge test. Pearson correlation coefficients were calculated to determine the associations between the predictor variables (knee and hip strength, and ankle ROM) and the main outcome measure (knee-to-hip flexion ratio). Correlation between knee-to-hip flexion ratio and hip abductors strength was significant (r = ?0.47; p = 0.019). No other significant correlations were observed among the variables (p > 0.05). These results demonstrated that a lower hip abductors strength in male soccer players was correlated with a high knee-to-hip flexion ratio during landing from a single leg jump, potentially increasing knee overload by decreasing energy absorption at the hip. The results provide a novel proposal for the functioning of hip muscles to control knee overload. 相似文献
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Several studies employing the "20 questions" test reported that reflective children asked proportionally more constraint-seeking (CS) questions than did impulsive children. The finding was interpreted as supporting the generally accepted view that reflective children are more mature and more efficient problem solvers than impulsive children. Inexplicably, the reflectives' higher proportion of CS questions was not associated with fewer questions to solution, that is, with greater efficiency. The present study examined an alternative hypothesis that differences in performance of impulsive and reflective children on the "20 questions" test are due to individual differences in preferred perceptual processing strategy rather than in cognitive maturity of problem-solving strategy. Efficiency of performance of reflective and impulsive children was shown to be related to type of stimuli and experimental conditions employed, supporting a perceptual rather than cognitive-maturational interpretation. 相似文献