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高强度输送带帆布的结构和特点 被引量:3
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作者 董乃伦 顾征宇 《橡胶工业》 CAS 北大核心 2004年第8期485-487,共3页
高强度帆布与普通帆布的主要区别是纱线的弯曲程度更小 ,因此主要采用直经直纬或经二重结构。采用高强度帆布生产的输送带具有强度利用率高、生产工艺简单、质量稳定、尺寸稳定性和抗冲击性好等优点 ,而且可以降低对输送机辊筒直径和张... 高强度帆布与普通帆布的主要区别是纱线的弯曲程度更小 ,因此主要采用直经直纬或经二重结构。采用高强度帆布生产的输送带具有强度利用率高、生产工艺简单、质量稳定、尺寸稳定性和抗冲击性好等优点 ,而且可以降低对输送机辊筒直径和张紧长度的要求 ,并可更多地应用新型高模量材料。 展开更多
关键词 高强度帆布 输送带 织机 直经直纬结构 经二重结构
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The Dual Effects of Global Value Chain Embeddedness on Chinese Exports’ Technological Sophistication
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作者 刘维林 李兰冰 刘玉海 《China Economist》 2015年第1期58-72,共15页
This paper develops a framework for the assessment of global value chain embeddedness based on the dual structure of product embeddedness and functional embeddedness and provides a theoretical demonstration of the dua... This paper develops a framework for the assessment of global value chain embeddedness based on the dual structure of product embeddedness and functional embeddedness and provides a theoretical demonstration of the dual effects of the level, structure and the value sources of global value chain embeddedness on export technology sophistication. From there, the paper carries out an estimation of non-competitive input- output table using quadratic optimized algorithm with differentiation between processing trade and general trade to arrive at various indicators of foreign value-added ratio that reflect the level of global value chain embeddedness. On this basis, the panel econometric model for 27 manufacturing sectors of China between 2001 and 2010 is employed to test the effect of foreign value-added ratio on the technology sophistication of manufacturing export. Our research indicates that by taking part in division of labor in the global value chain and acquiring foreign intermediate inputs, China's manufacturing sector has increased its export technology sophistication. It also indicates that, compared with such inputs as raw materials and parts and components, service input has great contributions to technology improvement. With the direct contributions of foreign value-added under control, the foreign value-added from developed countries has a restrictive effect on the R&D activities of export manufacturing, which gives rise to the one-way technology reliance on dominant enterprises of the value chain and the "low-end lock-up" effect; meanwhile, the method of embeddedness that takes advantage of the foreign value-added of other countries is more dependent on the indigenous R&D capacity of export enterprises and thus more favorable to the improvement of export technology sophistication. 展开更多
关键词 global value chain foreign value-added export technology sophistication vertical professionalization
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