In the Pearl River Delta (PRD), there is severe competition between container ports, particularly those in Hong Kong, Shenzhen, and Guangzhou, for collecting international maritime container cargo. In addition, the se...In the Pearl River Delta (PRD), there is severe competition between container ports, particularly those in Hong Kong, Shenzhen, and Guangzhou, for collecting international maritime container cargo. In addition, the second phase of the Nansha terminal in Guangzhou’s port and the first phase of the Da Chang Bay container terminal in Shenzhen opened last year. Under these circumstances, there is an increasing need to quantitatively measure the impact these infrastructure investments have on regional cargo flows. The analysis should include the effects of container terminal construction, berth deepening, and access road construction. The authors have been developing a model for international cargo simulation (MICS) which can simulate the movement of cargo. The volume of origin-destination (OD) container cargo in the East Asian region was used as an input, in order to evaluate the effects of international freight transportation policies. This paper focuses on the PRD area and, by incorporating a more detailed network, evaluates the impact of several infrastructure investment projects on freight movement.展开更多
几年来肥料试验结果证明,桑田合理配施三要素肥,不仅能提高桑叶产量和质量,而且具有提高肥料利用率和对土壤养分消长及养分平衡等方面作用。了解桑田土壤供 N能力是做到“以田定产,以产定 N.以 N 配施 P.K 肥”的前提,实际上影响土壤供...几年来肥料试验结果证明,桑田合理配施三要素肥,不仅能提高桑叶产量和质量,而且具有提高肥料利用率和对土壤养分消长及养分平衡等方面作用。了解桑田土壤供 N能力是做到“以田定产,以产定 N.以 N 配施 P.K 肥”的前提,实际上影响土壤供 N 量的因素很多,但前人对桑田土壤供 N 量最适测定项目及其数量指标的研究极少报道,为此,我们在结合“桑田配施三要素肥料研究”中间试验过程中,对我省有代表性蚕桑区(八县一场23个农户)不同类型和不同肥力桑田土壤进行全面理化分析及产量试验调查,并以国内外广泛应用的作物对肥料效应方程研究法,进行分析。展开更多
文摘In the Pearl River Delta (PRD), there is severe competition between container ports, particularly those in Hong Kong, Shenzhen, and Guangzhou, for collecting international maritime container cargo. In addition, the second phase of the Nansha terminal in Guangzhou’s port and the first phase of the Da Chang Bay container terminal in Shenzhen opened last year. Under these circumstances, there is an increasing need to quantitatively measure the impact these infrastructure investments have on regional cargo flows. The analysis should include the effects of container terminal construction, berth deepening, and access road construction. The authors have been developing a model for international cargo simulation (MICS) which can simulate the movement of cargo. The volume of origin-destination (OD) container cargo in the East Asian region was used as an input, in order to evaluate the effects of international freight transportation policies. This paper focuses on the PRD area and, by incorporating a more detailed network, evaluates the impact of several infrastructure investment projects on freight movement.
文摘几年来肥料试验结果证明,桑田合理配施三要素肥,不仅能提高桑叶产量和质量,而且具有提高肥料利用率和对土壤养分消长及养分平衡等方面作用。了解桑田土壤供 N能力是做到“以田定产,以产定 N.以 N 配施 P.K 肥”的前提,实际上影响土壤供 N 量的因素很多,但前人对桑田土壤供 N 量最适测定项目及其数量指标的研究极少报道,为此,我们在结合“桑田配施三要素肥料研究”中间试验过程中,对我省有代表性蚕桑区(八县一场23个农户)不同类型和不同肥力桑田土壤进行全面理化分析及产量试验调查,并以国内外广泛应用的作物对肥料效应方程研究法,进行分析。
