I type system model of CCCAM(Contention-Collision Cancellation Access Mode) is studied through mathematical modelling and simulation. There are two innovations: (1) in the process of mathematical modelling, the instan...I type system model of CCCAM(Contention-Collision Cancellation Access Mode) is studied through mathematical modelling and simulation. There are two innovations: (1) in the process of mathematical modelling, the instance of 'serving customers unsuccessfully' is taken into account; (2) the time at which customers depart after having been served successfully are chosen to be the embedded point, thereby 'free period' is introduced reasonably. So the mathematical modelling and analysis result in this paper are significant for application of wire star LAN and wireless star LAN.展开更多
Nowadays, consumers often compare the same kind of commodities and decide what to pick out when they purchase merchandise including the service. The paper discusses the mathematical mode of quantification performance-...Nowadays, consumers often compare the same kind of commodities and decide what to pick out when they purchase merchandise including the service. The paper discusses the mathematical mode of quantification performance-to-price ratio according to which product can be made in order to increase the competitiveness in the market.展开更多
With the reform of talent demand mode in China,in today’s society,the need for talents of enterprises are more inclined to application-type vocational and technical talents,this has created enormous opportunities for...With the reform of talent demand mode in China,in today’s society,the need for talents of enterprises are more inclined to application-type vocational and technical talents,this has created enormous opportunities for the growing of higher vocational colleges which are the incubation base for applied talents,at the same time,it also exposes the practical problems of the backwardness of the current mathematics teaching mode in higher vocational colleges,thus brings unfavorable influence on the implementation of the talent cultivation program in higher vocational colleges,“Task list”is one of the teaching requirements put forward by China’s educational reform in the new age,and the important direction for higher vocational colleges to reform the mathematics teaching mode in the new age.展开更多
Based on the analysis of material motion in the axial direction, heat transfer and mass transport processes in a rotary kiln, and combining with pulverized coal combustion, material pyrogenation, cooling of furnace wa...Based on the analysis of material motion in the axial direction, heat transfer and mass transport processes in a rotary kiln, and combining with pulverized coal combustion, material pyrogenation, cooling of furnace wall finally, and heat transfer and mass transport equations, the combined heat transfer mathematical model for alumina rotary kiln was built up. According to the in-site real operation parameters, the heat transfer mathematical model was solved numerically for an alumina rotary kiln to predict the temperature profiles of gas and material in the axial direction. The results show that as the excess air coefficient reduces from 1.38 to 1.20, the temperature of the sintering zone increases and the length decreases. However, as the excess air coefficient reduces from 1.20 to 1.10, the temperature of the sintering zone decreases and the length increases. When the mixed coal amount at the end of kiln is reduced from 68.6 kg/t to 62.0 kg/t and the burned coal amount at the head of kiln correspondingly increases from 155.3 kg/t to 161.9 kg/t, the sintering zone temperature increases and the length reduces. The suitable excess air coefficient and mixed coal amount at the end of kiln are recommended for the rotary kiln operation optimization.展开更多
The mathematical models of the flow of polymer foam in porous media under three injection modes are established and the relevant numerical calculation methods are given. The profiles of the liquid phase saturation, th...The mathematical models of the flow of polymer foam in porous media under three injection modes are established and the relevant numerical calculation methods are given. The profiles of the liquid phase saturation, the pressure drop and the number density of the flowing HPAM foam in artificial sandstone cores with the dimensionless distance under three injection modes are numerically calculated and analyzed. The results show that, compared with the injection mode 2 and 3, HPAM foam flows in a piston-like fashion in the artificial sandstone core under the injection mode 1 and produces the biggest pressure drop. Obviously, the flood efficiency is the highest under the injection mode 1.展开更多
All authors of papers published in this volume are listed alphabetically according to the last name of each author. Full titles are included in each first author's entry.
基金Supported by Natural Science Foundation of Qingdao University
文摘I type system model of CCCAM(Contention-Collision Cancellation Access Mode) is studied through mathematical modelling and simulation. There are two innovations: (1) in the process of mathematical modelling, the instance of 'serving customers unsuccessfully' is taken into account; (2) the time at which customers depart after having been served successfully are chosen to be the embedded point, thereby 'free period' is introduced reasonably. So the mathematical modelling and analysis result in this paper are significant for application of wire star LAN and wireless star LAN.
文摘Nowadays, consumers often compare the same kind of commodities and decide what to pick out when they purchase merchandise including the service. The paper discusses the mathematical mode of quantification performance-to-price ratio according to which product can be made in order to increase the competitiveness in the market.
文摘With the reform of talent demand mode in China,in today’s society,the need for talents of enterprises are more inclined to application-type vocational and technical talents,this has created enormous opportunities for the growing of higher vocational colleges which are the incubation base for applied talents,at the same time,it also exposes the practical problems of the backwardness of the current mathematics teaching mode in higher vocational colleges,thus brings unfavorable influence on the implementation of the talent cultivation program in higher vocational colleges,“Task list”is one of the teaching requirements put forward by China’s educational reform in the new age,and the important direction for higher vocational colleges to reform the mathematics teaching mode in the new age.
基金Project(11C26214202599) supported by the SME Technology Innovation Fund of Ministry of Science and Technology,China
文摘Based on the analysis of material motion in the axial direction, heat transfer and mass transport processes in a rotary kiln, and combining with pulverized coal combustion, material pyrogenation, cooling of furnace wall finally, and heat transfer and mass transport equations, the combined heat transfer mathematical model for alumina rotary kiln was built up. According to the in-site real operation parameters, the heat transfer mathematical model was solved numerically for an alumina rotary kiln to predict the temperature profiles of gas and material in the axial direction. The results show that as the excess air coefficient reduces from 1.38 to 1.20, the temperature of the sintering zone increases and the length decreases. However, as the excess air coefficient reduces from 1.20 to 1.10, the temperature of the sintering zone decreases and the length increases. When the mixed coal amount at the end of kiln is reduced from 68.6 kg/t to 62.0 kg/t and the burned coal amount at the head of kiln correspondingly increases from 155.3 kg/t to 161.9 kg/t, the sintering zone temperature increases and the length reduces. The suitable excess air coefficient and mixed coal amount at the end of kiln are recommended for the rotary kiln operation optimization.
文摘The mathematical models of the flow of polymer foam in porous media under three injection modes are established and the relevant numerical calculation methods are given. The profiles of the liquid phase saturation, the pressure drop and the number density of the flowing HPAM foam in artificial sandstone cores with the dimensionless distance under three injection modes are numerically calculated and analyzed. The results show that, compared with the injection mode 2 and 3, HPAM foam flows in a piston-like fashion in the artificial sandstone core under the injection mode 1 and produces the biggest pressure drop. Obviously, the flood efficiency is the highest under the injection mode 1.
文摘All authors of papers published in this volume are listed alphabetically according to the last name of each author. Full titles are included in each first author's entry.