The paper presents the comparative study on numerical methods of Euler method,Improved Euler method and fourth-order Runge-Kutta method for solving the engineering problems and applications.The three proposed methods ...The paper presents the comparative study on numerical methods of Euler method,Improved Euler method and fourth-order Runge-Kutta method for solving the engineering problems and applications.The three proposed methods are quite efficient and practically well suited for solving the unknown engineering problems.This paper aims to enhance the teaching and learning quality of teachers and students for various levels.At each point of the interval,the value of y is calculated and compared with its exact value at that point.The next interesting point is the observation of error from those methods.Error in the value of y is the difference between calculated and exact value.A mathematical equation which relates various functions with its derivatives is known as a differential equation.It is a popular field of mathematics because of its application to real-world problems.To calculate the exact values,the approximate values and the errors,the numerical tool such as MATLAB is appropriate for observing the results.This paper mainly concentrates on identifying the method which provides more accurate results.Then the analytical results and calculates their corresponding error were compared in details.The minimum error directly reflected to realize the best method from different numerical methods.According to the analyses from those three approaches,we observed that only the error is nominal for the fourth-order Runge-Kutta method.展开更多
Quality function deployment （QFD） is a quality system, that can help to design novel products that meet customers＇ needs. Theory of inventive problem solving （TRIZ） is a very powerful tool in helping to solve dif...Quality function deployment （QFD） is a quality system, that can help to design novel products that meet customers＇ needs. Theory of inventive problem solving （TRIZ） is a very powerful tool in helping to solve difficult technical problems encountered in the design process. Introducing QFD and TRIZ into the conceptual design of the pumping unit combines advantages of these two theories, therefore meeting different demands of different users. It can tell us “What should we do it” with QFD and “How should we do it” with TRIZ. The conceptual design method, which is based on QFD and TRIZ, is introduced andused to analyze and evaluate the conceptual design project of a pumping unit.展开更多
For the 2-D wave inverse problems introduced from geophysical exploration, in this paper, the author presents integration-characteristic method to solve the velocity parameter, and then applies it to common shotpoint ...For the 2-D wave inverse problems introduced from geophysical exploration, in this paper, the author presents integration-characteristic method to solve the velocity parameter, and then applies it to common shotpoint model data, in noise-free case. The accuracy is quite good.展开更多
Genetic algorithm(GA)is a heuristic and random search technique for mimicking na-ture.This paper presents the basic principle and principal character of GA,and the defini-tion and function of the genetic operators.On ...Genetic algorithm(GA)is a heuristic and random search technique for mimicking na-ture.This paper presents the basic principle and principal character of GA,and the defini-tion and function of the genetic operators.On the basis of these,the paper proposes a newmethod of solving the Job-Shop group scheduling problem by use of GA,and discusses thecoded representation method of the feasible solution and the particular limitation to the ge-netic operators.展开更多
目的探讨基于问题解决模式的护理干预结合情绪释放法在妊娠期糖尿病中的应用效果。方法选取2019年2月至2022年2月收治的120例妊娠期糖尿病患者为研究对象,以随机数字表法将其分为对照组和观察组,各60例。对照组施以常规护理干预,观察组...目的探讨基于问题解决模式的护理干预结合情绪释放法在妊娠期糖尿病中的应用效果。方法选取2019年2月至2022年2月收治的120例妊娠期糖尿病患者为研究对象,以随机数字表法将其分为对照组和观察组,各60例。对照组施以常规护理干预,观察组在此基础上实施基于问题解决模式的护理干预结合情绪释放法。比较两组的干预效果。结果干预后,观察组的空腹血糖(FBG)、餐后2 h血糖(2 h PBG)、糖化血红蛋白(HbA1c)、总胆固醇(TC)、甘油三酯(TG)、游离脂肪酸(FFA)水平均低于对照组(P<0.05)。干预后,观察组的简化疾病感知量表(BIPQ)各维度评分均低于对照组(P<0.05)。观察组的母婴不良结局总发生率均低于对照组(P<0.05)。结论基于问题解决模式的护理干预结合情绪释放法有助于改善妊娠期糖尿病患者代谢营养,提高疾病感知程度,也能促进妊娠结局改善,值得推广。展开更多
This paper establishes a mathematical model of the reliability optimization design for the safe-arming system of an air-faced missile, and presents a solving method for the model. The computational results provide a v...This paper establishes a mathematical model of the reliability optimization design for the safe-arming system of an air-faced missile, and presents a solving method for the model. The computational results provide a valuable reference for the reliability design for the safe-arming system of an air-faced missile.展开更多
文摘The paper presents the comparative study on numerical methods of Euler method,Improved Euler method and fourth-order Runge-Kutta method for solving the engineering problems and applications.The three proposed methods are quite efficient and practically well suited for solving the unknown engineering problems.This paper aims to enhance the teaching and learning quality of teachers and students for various levels.At each point of the interval,the value of y is calculated and compared with its exact value at that point.The next interesting point is the observation of error from those methods.Error in the value of y is the difference between calculated and exact value.A mathematical equation which relates various functions with its derivatives is known as a differential equation.It is a popular field of mathematics because of its application to real-world problems.To calculate the exact values,the approximate values and the errors,the numerical tool such as MATLAB is appropriate for observing the results.This paper mainly concentrates on identifying the method which provides more accurate results.Then the analytical results and calculates their corresponding error were compared in details.The minimum error directly reflected to realize the best method from different numerical methods.According to the analyses from those three approaches,we observed that only the error is nominal for the fourth-order Runge-Kutta method.
文摘Quality function deployment （QFD） is a quality system, that can help to design novel products that meet customers＇ needs. Theory of inventive problem solving （TRIZ） is a very powerful tool in helping to solve difficult technical problems encountered in the design process. Introducing QFD and TRIZ into the conceptual design of the pumping unit combines advantages of these two theories, therefore meeting different demands of different users. It can tell us “What should we do it” with QFD and “How should we do it” with TRIZ. The conceptual design method, which is based on QFD and TRIZ, is introduced andused to analyze and evaluate the conceptual design project of a pumping unit.
文摘For the 2-D wave inverse problems introduced from geophysical exploration, in this paper, the author presents integration-characteristic method to solve the velocity parameter, and then applies it to common shotpoint model data, in noise-free case. The accuracy is quite good.
基金Supported by the High Technology Research and Development Programme of China.
文摘Genetic algorithm(GA)is a heuristic and random search technique for mimicking na-ture.This paper presents the basic principle and principal character of GA,and the defini-tion and function of the genetic operators.On the basis of these,the paper proposes a newmethod of solving the Job-Shop group scheduling problem by use of GA,and discusses thecoded representation method of the feasible solution and the particular limitation to the ge-netic operators.
文摘目的探讨基于问题解决模式的护理干预结合情绪释放法在妊娠期糖尿病中的应用效果。方法选取2019年2月至2022年2月收治的120例妊娠期糖尿病患者为研究对象,以随机数字表法将其分为对照组和观察组,各60例。对照组施以常规护理干预,观察组在此基础上实施基于问题解决模式的护理干预结合情绪释放法。比较两组的干预效果。结果干预后,观察组的空腹血糖(FBG)、餐后2 h血糖(2 h PBG)、糖化血红蛋白(HbA1c)、总胆固醇(TC)、甘油三酯(TG)、游离脂肪酸(FFA)水平均低于对照组(P<0.05)。干预后,观察组的简化疾病感知量表(BIPQ)各维度评分均低于对照组(P<0.05)。观察组的母婴不良结局总发生率均低于对照组(P<0.05)。结论基于问题解决模式的护理干预结合情绪释放法有助于改善妊娠期糖尿病患者代谢营养,提高疾病感知程度,也能促进妊娠结局改善,值得推广。
文摘This paper establishes a mathematical model of the reliability optimization design for the safe-arming system of an air-faced missile, and presents a solving method for the model. The computational results provide a valuable reference for the reliability design for the safe-arming system of an air-faced missile.
