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이염보(Li Yanbao),구구(Qiu Ju) 한국항만경제학회 1995 韓國港灣經濟學會誌 Vol.11 No.-
In this paper, the relation between the port distribution and egional economic development is discussed by analysing the distribution, changes, and development of sea ports in Chinese mainland. Chapter I describes briefly the distribution character of the sea ports. Here introduced are surveys of 19 key ports, 7 ports of which (Shanghai, Qinhuangdao, Guangshon, Dalian, Ningbo, Tjanjin, Qingdao), have a yearly volume freight traffic of over 40 million tons. The other 12 key ports are Yingkou Yantai, Rizhao, Lianyungang, Fuzjhou, Xiamen , Shantou, Shenzhen, Zhuhai, Zhanjiang, Fangcheng and Haikou.<br/> Chapter 2 describes the history of the development of sea ports and discusses the relation between the port distribution and regional economy. The large- scale port construction began in the ear1y 1970's when China's foreign trade started to expand. M ore than 20 berthes are incread every year since 1980 and several high-efficiney specialzed terminals which can handle 100000t ships, and container terminals have been built. As for the relation between the port distribution and regional economy it can be pointed out the following:<br/> 1. The original situation for port distribution is mainly formed by naturalgeograhial conditions.<br/> 2. The port distribution is changed by the economic development and transportrequirement so the restriction of natural conditions will be broken through.<br/> 3.The port distribution is controled by the distribution of productive forces and material flow direction. The port distribution will be changed with the restructuring of industries.<br/> 4. The port and regional economy promote each other and the port function is being multi-dimensionlized.<br/> Chapter 3 predicts the planning of sea port development .Developing key ports and port groups is the tendency for modern port planning. Along the mainland coastal line 7 regions arc divided. For each region, the economicic superiority, transport requirements, the role and status of key and major portsare discussed.
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Preparation of carbonated apatite nano-whiskers in SBF with ultrasonic assistance
Yanli Geng,Yanbao Li,Dongxu Li 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.5
Carbonated apatite nano-whiskers were prepared in simulated body fluids (SBF) with ultrasonic assistance at 37℃. The effects of the initial pH value in the SBF solution and reaction times were investigated in this study. The calcium phosphate precipitates were examined by XRD, FTIR and TEM techniques. The results showed that the initial pH value in the SBF had an important effect on the morphology and composition of the calcium phosphate precipitates, and carbonated apatite nanowhiskers with length/diameter ratio of ~20 were obtained at an initial pH = 7.5 after ultrasonic treatment for 24 h. Carbonated apatite nano-whiskers were prepared in simulated body fluids (SBF) with ultrasonic assistance at 37℃. The effects of the initial pH value in the SBF solution and reaction times were investigated in this study. The calcium phosphate precipitates were examined by XRD, FTIR and TEM techniques. The results showed that the initial pH value in the SBF had an important effect on the morphology and composition of the calcium phosphate precipitates, and carbonated apatite nanowhiskers with length/diameter ratio of ~20 were obtained at an initial pH = 7.5 after ultrasonic treatment for 24 h.
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Xiaojun Tao,Shuang Wang,Yanbao Zhao,Zhiwei Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.2
In this paper, a facile one-pot bottom-up approach for the preparation of graphene and Ni/graphene nanostructures at normal pressure and low temperature (150 ℃) has been developed. The graphene and Ni/graphene nanostructures were prepared by reducing hexachloro-benzene (C6Cl6 Þ with potassium in n-tetradecane (C14H30) solution without the presence of a catalyst. Meanwhile, the effect of Ni content on the specific surface area (SSA) of the final products was investigated. The testing results display that the as-prepared samples have large SSA and high C/O ratio, implying that the designed synthesis method is simple and efficient. To evaluate the adsorption performances of the samples, we select organic dye rhodamine B (RhB) as the model organic contaminant in aqueous solutions. The experimental results show that the samples possess high adsorption capacity (qmax = 943.4mg g -1), ultrafast adsorption rate (> 99%, 2 min), high adsorption efficiency ( ≥ 99.8%) and good chemical stability in a wide pH range (2–11), high salt tolerance (> 80 mg mL -1), and good reusability (> 99.5%, 9 cycles) for dye RhB from water. In particular, the samples exhibit a good property for the treatment of the raw industrial wastewater (RIW).
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