The economic development of China has transformed from factor-driven type to innovation-driven type,and the upgrading of industrial structure is very important. In this paper,in order to explore the path of the coupli...The economic development of China has transformed from factor-driven type to innovation-driven type,and the upgrading of industrial structure is very important. In this paper,in order to explore the path of the coupling effect of modern service industry and agriculture,based on previous research and practical experience,we select 14 indicators,and then use the theory of dissipative structure,coupling degree and coupling coordination degree to measure the coupling phase of modern service industry and agriculture. On this basis,we use the spillover effect for the empirical testing of influence of modern service industry on agricultural development. The study shows that modern service industry and agriculture in our country are at the medium coupling,and in the early stage of development. The spillover effects of China's modern service industry on China's economic development and agricultural progress are significant. Finally,the policy recommendations are put forward from tourism,logistics and so on to promote the coupling of modern service industry and agriculture and provide a reference for promoting the coupling level of China's modern service industry and agriculture.展开更多
Using improved homogeneous balance method, we obtain new exact solutions for the coupled integrable dispersionless equation. On the basis of these exact solutions, we find some new interesting coherent structures by s...Using improved homogeneous balance method, we obtain new exact solutions for the coupled integrable dispersionless equation. On the basis of these exact solutions, we find some new interesting coherent structures by selecting arbitrary functions appropriately.展开更多
Profile shift is a highly effective technique for optimizing the performance of spur gear transmission systems.However,tooth surface wear is inevitable during gear meshing due to inadequate lubrication and long-term o...Profile shift is a highly effective technique for optimizing the performance of spur gear transmission systems.However,tooth surface wear is inevitable during gear meshing due to inadequate lubrication and long-term operation.Both profile shift and tooth surface wear(TSW)can impact the meshing characteristics by altering the involute tooth profile.In this study,a tooth stiffness model of spur gears that incorporates profile shift,TSW,tooth deformation,tooth contact deformation,fillet-foundation deformation,and gear body structure coupling is established.This model efficiently and accurately determines the time-varying mesh stiffness(TVMS).Additionally,an improved wear depth prediction method for spur gears is developed,which takes into consideration the mutually prime teeth numbers and more accurately reflects actual gear meshing conditions.Results show that consideration of the mutual prime of teeth numbers will have a certain impact on the TSW process.Furthermore,the finite element method(FEM)is employed to accurately verify the values of TVMS and load sharing ratio(LSR)of profile-shifted gears and worn gears.This study quantitatively analyzes the effect of profile shift on the surface wear process,which suggests that gear profile shift can partially alleviate the negative effects of TSW.The contribution of this study provides valuable insights into the design and maintenance of spur gear systems.展开更多
The Schrodinger equation type nonlinear coupled Maccari system is a significant equation that flourished with the wide-ranging arena concerning fluid flow and the theory of deep-water waves,physics of plasma,nonlinear...The Schrodinger equation type nonlinear coupled Maccari system is a significant equation that flourished with the wide-ranging arena concerning fluid flow and the theory of deep-water waves,physics of plasma,nonlinear optics,etc.We exploit the enhanced tanh approach and the rational(G/G)-expansion process to retrieve the soliton and dissimilar soliton solutions to the Maccari system in this study.The suggested systems of nonlinear equations turn into a differential equation of single variable through executing some operations of wave variable alteration.Thereupon,with the successful implementation of the advised techniques,a lot of exact soliton solutions are regained.The obtained solutions are depicted in 2D,3D,and contour traces by assigning appropriate values of the allied unknown constants.These diverse graphical appearances assist the researchers to understand the underlying processes of intricate phenomena of the leading equations.The individual performances of the employed methods are praise-worthy which justify further application to unravel many other nonlinear evolution equations ascending in various branches of science and engineering.展开更多
为了研究土壤重金属元素的化学形态,以优化的BCR法模拟自然环境条件,连续提取了不同土壤标准物质中Cd、Cr、Cu、Ni、Pb、Zn的交换态、还原态、氧化态;采用微波混酸(5mL HNO_3+2 mL HCl+1 mL HF)消解土壤样品,电感耦合等离子体质谱法(ICP...为了研究土壤重金属元素的化学形态,以优化的BCR法模拟自然环境条件,连续提取了不同土壤标准物质中Cd、Cr、Cu、Ni、Pb、Zn的交换态、还原态、氧化态;采用微波混酸(5mL HNO_3+2 mL HCl+1 mL HF)消解土壤样品,电感耦合等离子体质谱法(ICP-MS)分析测定,在碰撞反应池模式(CCT)下以^(115)In和^(209)Bi双内标加入法进行信号漂移补偿和干扰校正;以形态分析标准参考物质(欧盟RCR-701)验证了方法的准确性。结果表明,CCT动态模式能有效地降低检测过程中多原子离子的干扰作用,检测分析方法的检出限均小于0. 2 ng/g,RSD <1. 35%(n=5),方法验证性实验说明所选方法准确可靠;土壤样品中各元素3种化学形态与残渣中含量的加和均与总量参考值接近,回收率在95%～110%之间;该法适于土壤重金属形态的提取和分析测定,对研究土壤重金属的赋存特征、迁移转化规律及影响因素、重金属元素的来源及土壤重金属污染的治理与修复有一定的指导意义。展开更多
基金Supported by Xinjiang Social Science Foundation(10CJY028)Xinjiang Industry-Academia-Research Demonstration Graduate Training Base Funding Project(xjaucxy-yjs-20131034)
文摘The economic development of China has transformed from factor-driven type to innovation-driven type,and the upgrading of industrial structure is very important. In this paper,in order to explore the path of the coupling effect of modern service industry and agriculture,based on previous research and practical experience,we select 14 indicators,and then use the theory of dissipative structure,coupling degree and coupling coordination degree to measure the coupling phase of modern service industry and agriculture. On this basis,we use the spillover effect for the empirical testing of influence of modern service industry on agricultural development. The study shows that modern service industry and agriculture in our country are at the medium coupling,and in the early stage of development. The spillover effects of China's modern service industry on China's economic development and agricultural progress are significant. Finally,the policy recommendations are put forward from tourism,logistics and so on to promote the coupling of modern service industry and agriculture and provide a reference for promoting the coupling level of China's modern service industry and agriculture.
基金Supported by Colleges and Universities Scientific Research Foundation of Inner Mongolia Autonomous Region under Grant N0. NJZY07139Natural Science Foundation of Inner Mongolia Autonomous Region under Grant No. 200408020113
文摘Using improved homogeneous balance method, we obtain new exact solutions for the coupled integrable dispersionless equation. On the basis of these exact solutions, we find some new interesting coherent structures by selecting arbitrary functions appropriately.
基金Supported by National Natural Science Foundation of China (Grant No.52275061)。
文摘Profile shift is a highly effective technique for optimizing the performance of spur gear transmission systems.However,tooth surface wear is inevitable during gear meshing due to inadequate lubrication and long-term operation.Both profile shift and tooth surface wear(TSW)can impact the meshing characteristics by altering the involute tooth profile.In this study,a tooth stiffness model of spur gears that incorporates profile shift,TSW,tooth deformation,tooth contact deformation,fillet-foundation deformation,and gear body structure coupling is established.This model efficiently and accurately determines the time-varying mesh stiffness(TVMS).Additionally,an improved wear depth prediction method for spur gears is developed,which takes into consideration the mutually prime teeth numbers and more accurately reflects actual gear meshing conditions.Results show that consideration of the mutual prime of teeth numbers will have a certain impact on the TSW process.Furthermore,the finite element method(FEM)is employed to accurately verify the values of TVMS and load sharing ratio(LSR)of profile-shifted gears and worn gears.This study quantitatively analyzes the effect of profile shift on the surface wear process,which suggests that gear profile shift can partially alleviate the negative effects of TSW.The contribution of this study provides valuable insights into the design and maintenance of spur gear systems.
文摘The Schrodinger equation type nonlinear coupled Maccari system is a significant equation that flourished with the wide-ranging arena concerning fluid flow and the theory of deep-water waves,physics of plasma,nonlinear optics,etc.We exploit the enhanced tanh approach and the rational(G/G)-expansion process to retrieve the soliton and dissimilar soliton solutions to the Maccari system in this study.The suggested systems of nonlinear equations turn into a differential equation of single variable through executing some operations of wave variable alteration.Thereupon,with the successful implementation of the advised techniques,a lot of exact soliton solutions are regained.The obtained solutions are depicted in 2D,3D,and contour traces by assigning appropriate values of the allied unknown constants.These diverse graphical appearances assist the researchers to understand the underlying processes of intricate phenomena of the leading equations.The individual performances of the employed methods are praise-worthy which justify further application to unravel many other nonlinear evolution equations ascending in various branches of science and engineering.
文摘为了研究土壤重金属元素的化学形态,以优化的BCR法模拟自然环境条件,连续提取了不同土壤标准物质中Cd、Cr、Cu、Ni、Pb、Zn的交换态、还原态、氧化态;采用微波混酸(5mL HNO_3+2 mL HCl+1 mL HF)消解土壤样品,电感耦合等离子体质谱法(ICP-MS)分析测定,在碰撞反应池模式(CCT)下以^(115)In和^(209)Bi双内标加入法进行信号漂移补偿和干扰校正;以形态分析标准参考物质(欧盟RCR-701)验证了方法的准确性。结果表明,CCT动态模式能有效地降低检测过程中多原子离子的干扰作用,检测分析方法的检出限均小于0. 2 ng/g,RSD <1. 35%(n=5),方法验证性实验说明所选方法准确可靠;土壤样品中各元素3种化学形态与残渣中含量的加和均与总量参考值接近,回收率在95%～110%之间;该法适于土壤重金属形态的提取和分析测定,对研究土壤重金属的赋存特征、迁移转化规律及影响因素、重金属元素的来源及土壤重金属污染的治理与修复有一定的指导意义。
