Computational fluid dynamics （CFD） plays a major role in predicting the flow behavior of a ship. With the development of fast computers and robust CFD software, CFD has become an important tool for designers and eng...Computational fluid dynamics （CFD） plays a major role in predicting the flow behavior of a ship. With the development of fast computers and robust CFD software, CFD has become an important tool for designers and engineers in the ship industry. In this paper, the hull form of a ship was optimized for total resistance using CFD as a calculation tool and a genetic algorithm as an optimization tool. CFD based optimization consists of major steps involving automatic generation of geometry based on design parameters, automatic generation of mesh, automatic analysis of fluid flow to calculate the required objective/cost function, and finally an optimization tool to evaluate the cost for optimization. In this paper, integration of a genetic algorithm program, written in MATLAB, was carried out with the geometry and meshing software GAMBIT and CFD analysis software FLUENT. Different geometries of additive bulbous bow were incorporated in the original hull based on design parameters. These design variables were optimized to achieve a minimum cost function of ＂total resistance＂. Integration of a genetic algorithm with CFD tools proves to be effective for hull form ootimization.展开更多
Confined impinging jet reactor(CIJR)offers advantages for chemical rapid processes and has become an important new reactor used in the chemical industry.The micromixing efficiency in a T-shaped CIJR for two tubes of i...Confined impinging jet reactor(CIJR)offers advantages for chemical rapid processes and has become an important new reactor used in the chemical industry.The micromixing efficiency in a T-shaped CIJR for two tubes of inner diameter of 3 mm was studied by using a parallel competing iodide–iodate reaction as the working system.In this work,the effects of different operating conditions,such as impinging velocity and acid concentration,on segregation index were investigated.In addition,the effects of the inner nozzles diameter and the distance L between the jet axis and the top wall of the mixing chamber on the micromixing efficiency were also considered.It is concluded that the best range of L in this CIJR is 6.5–12.5 mm.Based on the incorporation model,the estimated minimum micromixing time tmof CIJR approximately equals to 2×10-4s.These experimental results indicate clearly that CIJR possesses a much better micromixing performance compared with the conventional stirred tank(micromixing time of 2×10-3to 2×10-2s).Hence,it can be envisioned that CIJR has more promising applications in various industrial processes.展开更多
On the analysis of Biel model and fruits from other scholars, conbining fast fashion clothing brands＇ characteristics and advantages/functions of ingredient co-branding, we built evaluation index system of ingredient...On the analysis of Biel model and fruits from other scholars, conbining fast fashion clothing brands＇ characteristics and advantages/functions of ingredient co-branding, we built evaluation index system of ingredient co-branding image from three aspects： product image, corporate image and marketing hype image. It will have important effects between ingredient enterprises and terminal companys when they implement co-branding strategy.展开更多
This study is motivated by the lack of direct empirical research on the relationship between intangible assets （IA） and loan interest rates for small- and medium-sized enterprises （SMEs） in emerging markets. This ...This study is motivated by the lack of direct empirical research on the relationship between intangible assets （IA） and loan interest rates for small- and medium-sized enterprises （SMEs） in emerging markets. This study uses a multivariate regression to investigate the effects of 1A on loan interest rates by focusing on SMEs. Using a panel sample of 186 publicly-listed SMEs with 952 annual observations in Taiwan from 2001 to 2006, the empirical findings indicate that an SME＇s IA does negatively affect loan interest rates. The main contribution of this study lies in its direct testing of whether IA can affect the loan interest rates for SMEs in an emerging market. The finding provides empirical evidence that an SME with greater IA leads to lower interest rates on bank loans, implying that SMEs should strive to invest in IA and enhance their knowledge management for obtaining more benefits of loan interest rates. Furthermore, the findings may provide empirical evidence for SMEs in emerging markets and can be compared with those for firms in industrialized economies.展开更多
The aim of this research was to develop the porous spherical cellulose production from corn cob as an exfoliating agent for cosmetic industries. In process development of the porous spherical cellulose production from...The aim of this research was to develop the porous spherical cellulose production from corn cob as an exfoliating agent for cosmetic industries. In process development of the porous spherical cellulose production from corn cob, it was found that alkaline extraction with 10% sodiumhydroxide gave 85.86% purity of cellulose and the crystallinity index of the pulp of 76.08%. Then, the obtained pulp was extracted with acid sodium chlorite. It was found that the acid sodium chlorite extraction increased the cellulose from 85.86% to 91.86%. The obtained pulp was hydrolyse dwithdilute hydrochloric solution. The result shows that the crystallinity increased from 71.13% to 86.31% with smaller crystallite size compared to that obtained acid sodium chlorite extraction. The hydrolysis pulp was used to prepare porous spherical cellulose which has homogeneous and rough surface. The porosity and pore volume of the porous spherical cellulose increased when the amount of calcium carbonate as porogen was increased. The porous spherical cellulose was prepared from the optimized conditions and the physical and chemical properties were analysed and compared with standard commercial beads （Sephadex G-25）. It was found that the porous spherical cellulose had particle size and pH value similar to the standard value. Hazardous substances such as arsenic, lead and mercury were not found in the obtained porous spherical cellulose. The consumers test shows that 87~/＇0 of consumers accepted the product and the overall complacency was great.展开更多
Current sciences fail in understanding the future trends of human beings＇ behaviors and cultures. From the hunting tribes to the agricultural society, the civilized country, and then to the industrial society, none o...Current sciences fail in understanding the future trends of human beings＇ behaviors and cultures. From the hunting tribes to the agricultural society, the civilized country, and then to the industrial society, none of these developments is the results of human beings＇ reasonable proposal. The human beings are ＂developed＂, i.e. pushed forward by certain invisible forces. As being cultural, they are dominated by their cultural concepts. To explore the source of every civilization＇s concepts, the formation history of its mythological concepts during the pre-historic period or at the beginning of its civilization shall be studied first. By interpreting the first literature works at the beginning of western civilization, the temporary mythologists reveal the rule that mythological concepts dominate the ritual behaviors and narrative expressions. This paper interprets the historical narratives in Records of the Grand Historian.＂ Annals of the First Emperor of Qin, to reproduce the concepts that dominate China＇s national rulers, present the theory of Mythological Concepts＇ Determinism, and correspond to the counter-force of ideology put forward by Friedrich Engels in his later years and the religious concepts＇ determinism by Max Weber, so as to illustrate the mythological concepts＇ function as the prototype code of ideology, and refer to a common and effective directory approach of social science studies.展开更多
In his government work report,Premier Li Keqiang vowed to deepen the reform of the financial sector in 2016.It includes efforts to improve the financial regulatory system,further liberalize interest rates and improve ...In his government work report,Premier Li Keqiang vowed to deepen the reform of the financial sector in 2016.It includes efforts to improve the financial regulatory system,further liberalize interest rates and improve the market-based mechanism for setting the yuan exchange rate.展开更多
文摘Computational fluid dynamics （CFD） plays a major role in predicting the flow behavior of a ship. With the development of fast computers and robust CFD software, CFD has become an important tool for designers and engineers in the ship industry. In this paper, the hull form of a ship was optimized for total resistance using CFD as a calculation tool and a genetic algorithm as an optimization tool. CFD based optimization consists of major steps involving automatic generation of geometry based on design parameters, automatic generation of mesh, automatic analysis of fluid flow to calculate the required objective/cost function, and finally an optimization tool to evaluate the cost for optimization. In this paper, integration of a genetic algorithm program, written in MATLAB, was carried out with the geometry and meshing software GAMBIT and CFD analysis software FLUENT. Different geometries of additive bulbous bow were incorporated in the original hull based on design parameters. These design variables were optimized to achieve a minimum cost function of ＂total resistance＂. Integration of a genetic algorithm with CFD tools proves to be effective for hull form ootimization.
基金Supported by the National Natural Science Foundation of China(21206002,21121064,20990224)the State Key Laboratory of Chemical Engineering(SKL-Ch E-13A03)
文摘Confined impinging jet reactor(CIJR)offers advantages for chemical rapid processes and has become an important new reactor used in the chemical industry.The micromixing efficiency in a T-shaped CIJR for two tubes of inner diameter of 3 mm was studied by using a parallel competing iodide–iodate reaction as the working system.In this work,the effects of different operating conditions,such as impinging velocity and acid concentration,on segregation index were investigated.In addition,the effects of the inner nozzles diameter and the distance L between the jet axis and the top wall of the mixing chamber on the micromixing efficiency were also considered.It is concluded that the best range of L in this CIJR is 6.5–12.5 mm.Based on the incorporation model,the estimated minimum micromixing time tmof CIJR approximately equals to 2×10-4s.These experimental results indicate clearly that CIJR possesses a much better micromixing performance compared with the conventional stirred tank(micromixing time of 2×10-3to 2×10-2s).Hence,it can be envisioned that CIJR has more promising applications in various industrial processes.
文摘On the analysis of Biel model and fruits from other scholars, conbining fast fashion clothing brands＇ characteristics and advantages/functions of ingredient co-branding, we built evaluation index system of ingredient co-branding image from three aspects： product image, corporate image and marketing hype image. It will have important effects between ingredient enterprises and terminal companys when they implement co-branding strategy.
文摘This study is motivated by the lack of direct empirical research on the relationship between intangible assets （IA） and loan interest rates for small- and medium-sized enterprises （SMEs） in emerging markets. This study uses a multivariate regression to investigate the effects of 1A on loan interest rates by focusing on SMEs. Using a panel sample of 186 publicly-listed SMEs with 952 annual observations in Taiwan from 2001 to 2006, the empirical findings indicate that an SME＇s IA does negatively affect loan interest rates. The main contribution of this study lies in its direct testing of whether IA can affect the loan interest rates for SMEs in an emerging market. The finding provides empirical evidence that an SME with greater IA leads to lower interest rates on bank loans, implying that SMEs should strive to invest in IA and enhance their knowledge management for obtaining more benefits of loan interest rates. Furthermore, the findings may provide empirical evidence for SMEs in emerging markets and can be compared with those for firms in industrialized economies.
文摘The aim of this research was to develop the porous spherical cellulose production from corn cob as an exfoliating agent for cosmetic industries. In process development of the porous spherical cellulose production from corn cob, it was found that alkaline extraction with 10% sodiumhydroxide gave 85.86% purity of cellulose and the crystallinity index of the pulp of 76.08%. Then, the obtained pulp was extracted with acid sodium chlorite. It was found that the acid sodium chlorite extraction increased the cellulose from 85.86% to 91.86%. The obtained pulp was hydrolyse dwithdilute hydrochloric solution. The result shows that the crystallinity increased from 71.13% to 86.31% with smaller crystallite size compared to that obtained acid sodium chlorite extraction. The hydrolysis pulp was used to prepare porous spherical cellulose which has homogeneous and rough surface. The porosity and pore volume of the porous spherical cellulose increased when the amount of calcium carbonate as porogen was increased. The porous spherical cellulose was prepared from the optimized conditions and the physical and chemical properties were analysed and compared with standard commercial beads （Sephadex G-25）. It was found that the porous spherical cellulose had particle size and pH value similar to the standard value. Hazardous substances such as arsenic, lead and mercury were not found in the obtained porous spherical cellulose. The consumers test shows that 87~/＇0 of consumers accepted the product and the overall complacency was great.
文摘Current sciences fail in understanding the future trends of human beings＇ behaviors and cultures. From the hunting tribes to the agricultural society, the civilized country, and then to the industrial society, none of these developments is the results of human beings＇ reasonable proposal. The human beings are ＂developed＂, i.e. pushed forward by certain invisible forces. As being cultural, they are dominated by their cultural concepts. To explore the source of every civilization＇s concepts, the formation history of its mythological concepts during the pre-historic period or at the beginning of its civilization shall be studied first. By interpreting the first literature works at the beginning of western civilization, the temporary mythologists reveal the rule that mythological concepts dominate the ritual behaviors and narrative expressions. This paper interprets the historical narratives in Records of the Grand Historian.＂ Annals of the First Emperor of Qin, to reproduce the concepts that dominate China＇s national rulers, present the theory of Mythological Concepts＇ Determinism, and correspond to the counter-force of ideology put forward by Friedrich Engels in his later years and the religious concepts＇ determinism by Max Weber, so as to illustrate the mythological concepts＇ function as the prototype code of ideology, and refer to a common and effective directory approach of social science studies.
文摘In his government work report,Premier Li Keqiang vowed to deepen the reform of the financial sector in 2016.It includes efforts to improve the financial regulatory system,further liberalize interest rates and improve the market-based mechanism for setting the yuan exchange rate.
