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Drosophila melanogaster has become an important invertebrate model organism in biological and medical research, for mutational and genetic analysis, and in toxicological screening. Many screening assays have been developed that assess the flies' mortality, reproduction, development, morphology, or behavioral competence. In this study, we describe a new(More)
An efficient three-dimensional (3D) hybrid material of nitrogen-doped graphene sheets (N-RGO) supporting molybdenum disulfide (MoS(2)) nanoparticles with high-performance electrocatalytic activity for hydrogen evolution reaction (HER) is fabricated by using a facile hydrothermal route. Comprehensive microscopic and spectroscopic characterizations confirm(More)
China's domestic rural-to-urban migration has reached a stage where migration in family units is common, and basic data on the wellbeing of these families in urban settings are required for adequate social services. To obtain such data, we conducted a large-scale (N = 16,550) cross-sectional survey in Beijing of rural-to-urban migrant workers' children(More)
Stock Markets, this paper empirically studies the degree of product market competition, the relationship between cash dividends distribution tendency and cash dividends policy. Results show that controlling shareholders have significant motivation to distribute cash dividends, and this kind of incentive is not significantly influenced by nature of(More)
Olfactory responses of Frankliniella occidentalis (Pergande) to odors from six vegetable host plants-cabbage (Brassica oleracea), lettuce (Lactuca sativa), cucumber (Cucumis sativus), eggplant (Solanum melongena), celery (Apium graveolens) and garlic (Allium sativum) - were measured in choice tests in a Y-tube olfactometer, while host suitability of these(More)
Medical image segmentation has important significance for thickness estimation of the articular cartilage and joint disease diagnosis. In this study, a novel automatic segmentation method based on Hough transform and edge detection was proposed to divide femoral cartilage in human hip joint from MR images. MR image was interpolated, smoothed and enhanced in(More)
This study examines the relationship between ownership structure and enterprise performance from the perspective of enterprise life cycle, by adding the variables of the enterprise life cycle stages into the model, to explain the inconsistence with the previous study results on this issue. Using a unique 2002-2007 panel data of the listed Chinese companies,(More)