The objective of this study is to investigate the effects of the Coulomb dry friction model versus the modified Coulomb friction model on the dynamic behavior of the slider-crank mechanism with a revolute clearance jo...The objective of this study is to investigate the effects of the Coulomb dry friction model versus the modified Coulomb friction model on the dynamic behavior of the slider-crank mechanism with a revolute clearance joint. The normal and tangential forces acting on the contact points between the journal and the bearing are described by using a Hertzian-based contact force model and the Coulomb friction models, respectively.The dynamic equations of the mechanism are derived based on the Lagrange equations of the first kind and the Baumgarte stabilization method. The frictional force is solved via the linear complementarity problem(LCP) algorithm and the trial-and-error algorithm.Finally, three numerical examples are given to show the influence of the two Coulomb friction models on the dynamic behavior of the mechanism. Numerical results show that due to the stick friction, the slider-crank mechanism may exhibit stick-slip motion and can balance at some special positions, while the mechanism with ideal joints cannot.展开更多
In this study,a modeling method for investigating the dynamic characteristics of a hydraulically driven shell manipulator with revolute clearance joints is presented.This model accounts for the effect of the clearance...In this study,a modeling method for investigating the dynamic characteristics of a hydraulically driven shell manipulator with revolute clearance joints is presented.This model accounts for the effect of the clearance,the flexibility of the rotating beam,and the coupled dynamic characteristics of the hydraulic cylinder.A modified contact force model was developed to simulate the physical properties of realistic revolute joints with small clearances,heavy loads,and variable contact stiffnesses and damping coefficients with variations of the indentations.Considering the strong coupling relationship between the hydraulic cylinder and the flexible beam,a system equation of motion combining the state variables of the hydraulic cylinder and mechanical system was established.The complex nonlinear friction force of the hydraulic cylinder motion was constructed using a modified Lu Gre model,and the parameters of the friction model were identified using intelligent identification algorithms.Moreover,a test system for the shell manipulator was established to achieve experimental validation.Finally,the effects of the clearance size and the stiffness of the cylinder support on the dynamic response were investigated.展开更多
This paper presents a non-smooth multibody dynamic formulation and error analysis of an antenna pointing mechanism including frictional spatial revolute joints(FSRJs)with small clearance in the framework of the specia...This paper presents a non-smooth multibody dynamic formulation and error analysis of an antenna pointing mechanism including frictional spatial revolute joints(FSRJs)with small clearance in the framework of the special Euclidian group SE(3).The formulation leads to an inertial frame-invariant,a compact and unified description for rigid bodies and spatial revolute joints(SRJs).The geometric constraint of the bearing is covered by four open semi-cylinders,which can be treated as bilateral constraints assuming that the impact effects are negligible.The frictional contact problem is formulated as a horizontal linear complementary problem(HLCP),which is embedded in the Lie-group integration scheme.Error of the antenna pointing mechanism is modeled by means of the adjoint transformation and POE-based formula.The evolution of errors is obtained through the solution of non-smooth dynamics.The obtained numerical results illustrate the influences of FSRJs in dynamics modeling and error analysis of the antenna pointing mechanism.展开更多
The existence of the relative radial and axial movements of a revolute joint’s journal and bearing is widely known.The three-dimensional(3D)revolute joint model considers relative radial and axial clearances;therefor...The existence of the relative radial and axial movements of a revolute joint’s journal and bearing is widely known.The three-dimensional(3D)revolute joint model considers relative radial and axial clearances;therefore,the freedoms of motion and contact scenarios are more realistic than those of the two-dimensional model.This paper proposes a wear model that integrates the modeling of a 3D revolute clearance joint and the contact force and wear depth calculations.Time-varying contact stiffness is first considered in the contact force model.Also,a cycle-update wear depth calculation strategy is presented.A digital image correlation(DIC)non-contact measurement and a cylindricity test are conducted.The measurement results are compared with the numerical simulation,and the proposed model’s correctness and the wear depth calculation strategy are verified.The results show that the wear amount distribution on the bearing’s inner surface is uneven in the axial and radial directions due to the journal’s stochastic oscillations.The maximum wear depth locates where at the bearing’s edges the motion direction of the follower shifts.These find-ings help to seek the revolute joints’wear-prone parts and enhance their durability and reliability through improved design.展开更多
There are clearances in mechanism because of manufacture and assembly error,which reduces operation life and working accuracy of mechanism and has a great impact on dynamical responses.At the moment,research in this a...There are clearances in mechanism because of manufacture and assembly error,which reduces operation life and working accuracy of mechanism and has a great impact on dynamical responses.At the moment,research in this area mainly focuses on single degree⁃of⁃freedom mechanism considering one clearance,while research of multi⁃DOF mechanism considering multi⁃clearance is less.With the purpose of studying the dynamical characteristics of complex multi⁃DOF mechanism with multi⁃clearances,a dynamic model was developed.The dynamic responses of 2⁃DOF mechanism with two clearances under different positions,values,and numbers of clearance were analyzed.The displacement,velocity,acceleration,collision force,and the axis trajectory at clearance were then given.In addition,there is a limited amount of literature on chaotic phenomena,which mainly focuses on the chaotic phenomena of end⁃effector of mechanism.But in this paper,the non⁃linear characteristics were analyzed by chaotic phenomenon of clearance joint,then chaotic phenomenon was identified by Poincarémappings and phase diagrams.Bifurcation diagrams were given.The results will offer a reliable technical support for the study of dynamical responses of planar mechanisms and the analysis of chaotic phenomena.展开更多
Clearances in joints of a mechanical multibody system can induce impulsive forces, leading to vibrations that compromise the system’s reliability, stability, and lifespan. Through dynamic analysis, designers can inve...Clearances in joints of a mechanical multibody system can induce impulsive forces, leading to vibrations that compromise the system’s reliability, stability, and lifespan. Through dynamic analysis, designers can investigate the effects of the clearances on the dynamics of the multibody system. A revolute joint with clearance exhibits three motions which are;free-flight, impact and continuous contact motion modes. Therefore, a multibody system with n-number of revolute clearance joints will exhibit 3n motion modes which are a combination of the three motions in each joint. This study investigates experimentally the nine motion modes in a mechanical system with two revolute clearance joints. A slider crank mechanism has been used as the demonstrative example. We observed that the experimental curve exhibits a greater impact compared to the simulation curve. In conclusion, this experimental investigation offers valuable insights into the dynamics of planar mechanical systems with multiple clearance revolute joints. Utilizing a slider-crank mechanism for data acquisition, the study successfully confirmed seven out of nine motion modes previously identified in numerical research. The missing modes are attributed to inherent complexities in real-world systems, such as journal-bearing misalignment.展开更多
A stationary clearance link algorithm(SCLA)for calculating the reaction-force of revolute clearance joints in crank slider mechanisms is proposed in this paper.The SCLA is more efficient than other algorithms of the s...A stationary clearance link algorithm(SCLA)for calculating the reaction-force of revolute clearance joints in crank slider mechanisms is proposed in this paper.The SCLA is more efficient than other algorithms of the same accuracy.Furthermore,based on the Winkler foundation model,an unsymmetrical Winkler foundation model and a double elastic layer Winkler model are proposed.By integrating a dynamic model and the unsymmetrical Winkler foundation model with Archard wear model,an improved integrated wear prediction model is also generated.A series of experiments have been performed to compare with the predicted analysis data,and the results showed a good agreement.As a real industry application,with the double elastic layer Winkler model,the integrated wear prediction model was successfully used to predict the wear depth of the joint bearing(bimetallic bearing)for the cantilever crane of a concrete pump truck of Sany Heavy Industry.展开更多
The ongoing revolution in information technology is reshaping human life. In the realm of health behavior, wearable technology emerges as a leading digital solution,capturing physical behaviors (i.e., physical activit...The ongoing revolution in information technology is reshaping human life. In the realm of health behavior, wearable technology emerges as a leading digital solution,capturing physical behaviors (i.e., physical activity, sedentary habits, sleep patterns) within the 24-h cycle of daily life. Wearables are applied in research, clinical practice, and as lifestyle devices;most obvious, they promise to be a key element for increasing human physical activity, one of the biggest health challenges nowadays.展开更多
In the dynamic landscape of modern healthcare and precision medicine,the digital revolution is reshaping medical industries at an unprecedented pace,and traditional Chinese medicine(TCM)is no exception[1-4].The paper...In the dynamic landscape of modern healthcare and precision medicine,the digital revolution is reshaping medical industries at an unprecedented pace,and traditional Chinese medicine(TCM)is no exception[1-4].The paper“From digits towards digitization:the past,present,and future of traditional Chinese medicine”by Academician&TCM National Master Qi WANG(王琦).展开更多
Aquiet revolution is underway in the vast cotton fields of Bortala Mongolian Autonomous Prefecture in north Xinjiang where harvesting machines,guided by digital sensors,operate with minimal human intervention.Accordin...Aquiet revolution is underway in the vast cotton fields of Bortala Mongolian Autonomous Prefecture in north Xinjiang where harvesting machines,guided by digital sensors,operate with minimal human intervention.According to Aoqierbate,head of the prefecture’s Bureau of Agriculture and Rural Affairs,now hundreds of hectares of cotton can be harvested by just one or two machine operators.展开更多
On 30 September 2024,the UK shuttered its last remaining coal-fired power plant[1].The closure marks a historic milestone,the end of 142 years of coal fueled prosperity.The country opened the world’s first plant to s...On 30 September 2024,the UK shuttered its last remaining coal-fired power plant[1].The closure marks a historic milestone,the end of 142 years of coal fueled prosperity.The country opened the world’s first plant to supply electric streetlamps in 1882,spark-ing a global energy revolution that has led to today’s nearly univer-sally electrified world.展开更多
Strategic emerging industries represent the forefront of the new technological revolution and industrial transformation,serving as a critical domain for China to cultivate new growth drivers and establish competitive ...Strategic emerging industries represent the forefront of the new technological revolution and industrial transformation,serving as a critical domain for China to cultivate new growth drivers and establish competitive advantages.The development of these industries has become a major strategy for leading countries to attain competitive advantages in the new wave of economic and technological advancement.The ongoing energy revolution is driving the transition of traditional energy systems toward green and low-carbon models,while simultaneously fostering emerging industrial clusters such as new energy equipment manufacturing,energy storage,and energy internet.Energy companies are accelerating the deployment of innovative models that integrate new and traditional energy systems through technological and business model innovation.This study systematically analyzes the current status,trends,opportunities,and challenges faced by energy companies venturing into strategic emerging industries.The findings aim to guide energy companies in navigating the dual imperatives of energy transition and industrial upgrading,thereby contributing to sustainable development and global competitiveness.展开更多
The metaverse is seen as the next technological revolution and tipped to generate up to$5 trillion in value by 2030,worldwide.However,many questions remain,and moving too fast could be detrimental if issues like priva...The metaverse is seen as the next technological revolution and tipped to generate up to$5 trillion in value by 2030,worldwide.However,many questions remain,and moving too fast could be detrimental if issues like privacy and interoperability are not ironed out soon.So what exactly is the metaverse and how can standards help?展开更多
After graduating from the China Academy of Arts(Department of Oil Painting)in Hangzhou in 1995,Yang Fudong(1971)moved to Shanghai to work as a graphic designer.Inspired by his daily job in Pudong,he started producing ...After graduating from the China Academy of Arts(Department of Oil Painting)in Hangzhou in 1995,Yang Fudong(1971)moved to Shanghai to work as a graphic designer.Inspired by his daily job in Pudong,he started producing photographic series that closely resembled the advertising campaigns he worked on.Glossy images of stylish young people or dishevelled white collars in highly saturated colours,defined“intellectuals”in cryptic accompanying captions.Conversely,his body of work in black and white,almost entirely shot on 35mm film,portrays a suspended reality out of the historical time:a ghostly dimension akin to a drowsy vigil,a uchronia,an“estranged paradise”-to borrow the title of his earliest film set in Hangzhou.But it is Shanghai’s elusiveness and material relationship with the past that has contributed the most to form Yang’s trademark imagery and aesthetic.What he conjures up in his still and moving images,is a dimension with a distinctive oneiric quality,an“in-between”universe where all the circumstances are justified and have an inner logic,just like in dreams,or just like in the China of his childhood.The research of Yang Fudong is somewhat unique in the universe of contemporary Chinese art and sets him apart from a plethora of artists that have used the video in a much more“didactic”and quotational way.I will illustrate some specific aspects of his black and white body of work,trying to show how a certain self-orientalist trait can be interpreted as strategy to regain narrative agency and bring to the surface a series of removed instances:the main of which being,in my opinion,the fate of Shanghai’s(perhaps of China's Mainland in its ungraspable entirety?)modernity.展开更多
In this conceptual paper,the author develops and presents a strategic decision-making framework that applies game theory to evaluate smart and natural farming approaches in India.In the face of increasing pressures fr...In this conceptual paper,the author develops and presents a strategic decision-making framework that applies game theory to evaluate smart and natural farming approaches in India.In the face of increasing pressures from climate change,resource scarcity,and evolving socio-economic landscapes,agriculture must adapt to the challenges of a volatile,uncertain,complex,and ambiguous(VUCA)world.When integrated with the Provision of Urban Amenities in Rural Areas(PURA)framework,VUCA offers a dynamic system perspective that contextualizes uncertainty and institutional capacity in farming systems.This study applies a modified Spence signaling model to capture how farmers-categorized as smart or natural versus conventional-choose to signal their sustainability credentials in an environment of asymmetric information.Using a combination of payoff matrix modelling,Bayesian belief updating,and evolutionary game simulations,the paper identifies strategic equilibria under varying levels of policy support,consumer trust,and signal cost.Farmers’decisions to adopt smart technologies or organic certifications are modelled as costly but credible signals of quality.These signals are then interpreted by receivers such as consumers,investors,or policymakers,who in turn adjust their support or market preferences.The analysis reveals conditions under which separating,pooling,and semi-separating equilibria emerge,and how these outcomes impact farmer behaviour and systemic sustainability.Case studies from Indian states such as Andhra Pradesh,Karnataka,and Punjab demonstrate how real-world farming programs mirror theoretical outcomes under different signalling strategies.The study also presents a robust methodological structure,combining conceptual modelling with policy simulation and validation through comparative cases.By integrating environmental,technological,and institutional perspectives,this paper contributes a hybrid strategic framework aligned with India’s Green Revolution 2.0 goals.It offers practical recommendations for policy design,infrastructure planning,and market mechanisms that support the scaling of sustainable agricultural practices through credible signalling and game-theoretic insights.展开更多
The Mexican mural movement,also known as Mexican muralism,is recognized as one of the most significant art movements of the 20th century.It developed in the aftermath of the Mexican Revolution,which took place between...The Mexican mural movement,also known as Mexican muralism,is recognized as one of the most significant art movements of the 20th century.It developed in the aftermath of the Mexican Revolution,which took place between 1910 and 1920.The country was striving to rebuild and unify after years of conflict,and muralism became a powerful tool for this transformation.展开更多
Artificial intelligence has the potential to stand as the cornerstone of human society,which could drive our civilization forward and emerge as a pivotal frontier in the ongoing technological revolution and industrial...Artificial intelligence has the potential to stand as the cornerstone of human society,which could drive our civilization forward and emerge as a pivotal frontier in the ongoing technological revolution and industrial transformation.Amidst profound shifts in the global technological landscape,smart materials,smart devices,and smart systems have become the defining pillars of our era,which will catalyze paradigm shifts in engineering science and reshape the trajectory of modern technology.展开更多
基金Project supported by the National Natural Science Foundation of China(No.11772021)
文摘The objective of this study is to investigate the effects of the Coulomb dry friction model versus the modified Coulomb friction model on the dynamic behavior of the slider-crank mechanism with a revolute clearance joint. The normal and tangential forces acting on the contact points between the journal and the bearing are described by using a Hertzian-based contact force model and the Coulomb friction models, respectively.The dynamic equations of the mechanism are derived based on the Lagrange equations of the first kind and the Baumgarte stabilization method. The frictional force is solved via the linear complementarity problem(LCP) algorithm and the trial-and-error algorithm.Finally, three numerical examples are given to show the influence of the two Coulomb friction models on the dynamic behavior of the mechanism. Numerical results show that due to the stick friction, the slider-crank mechanism may exhibit stick-slip motion and can balance at some special positions, while the mechanism with ideal joints cannot.
基金supported by the National Natural Science Foundation of China [grant number 11472137]the Fundamental Research Funds for the Central Universities [grant numbers 309181A8801,30919011204]。
文摘In this study,a modeling method for investigating the dynamic characteristics of a hydraulically driven shell manipulator with revolute clearance joints is presented.This model accounts for the effect of the clearance,the flexibility of the rotating beam,and the coupled dynamic characteristics of the hydraulic cylinder.A modified contact force model was developed to simulate the physical properties of realistic revolute joints with small clearances,heavy loads,and variable contact stiffnesses and damping coefficients with variations of the indentations.Considering the strong coupling relationship between the hydraulic cylinder and the flexible beam,a system equation of motion combining the state variables of the hydraulic cylinder and mechanical system was established.The complex nonlinear friction force of the hydraulic cylinder motion was constructed using a modified Lu Gre model,and the parameters of the friction model were identified using intelligent identification algorithms.Moreover,a test system for the shell manipulator was established to achieve experimental validation.Finally,the effects of the clearance size and the stiffness of the cylinder support on the dynamic response were investigated.
基金supported by the National Natural Science Foundation of China(No.51635002 Key Program,52075016,U20A20281)。
文摘This paper presents a non-smooth multibody dynamic formulation and error analysis of an antenna pointing mechanism including frictional spatial revolute joints(FSRJs)with small clearance in the framework of the special Euclidian group SE(3).The formulation leads to an inertial frame-invariant,a compact and unified description for rigid bodies and spatial revolute joints(SRJs).The geometric constraint of the bearing is covered by four open semi-cylinders,which can be treated as bilateral constraints assuming that the impact effects are negligible.The frictional contact problem is formulated as a horizontal linear complementary problem(HLCP),which is embedded in the Lie-group integration scheme.Error of the antenna pointing mechanism is modeled by means of the adjoint transformation and POE-based formula.The evolution of errors is obtained through the solution of non-smooth dynamics.The obtained numerical results illustrate the influences of FSRJs in dynamics modeling and error analysis of the antenna pointing mechanism.
文摘The existence of the relative radial and axial movements of a revolute joint’s journal and bearing is widely known.The three-dimensional(3D)revolute joint model considers relative radial and axial clearances;therefore,the freedoms of motion and contact scenarios are more realistic than those of the two-dimensional model.This paper proposes a wear model that integrates the modeling of a 3D revolute clearance joint and the contact force and wear depth calculations.Time-varying contact stiffness is first considered in the contact force model.Also,a cycle-update wear depth calculation strategy is presented.A digital image correlation(DIC)non-contact measurement and a cylindricity test are conducted.The measurement results are compared with the numerical simulation,and the proposed model’s correctness and the wear depth calculation strategy are verified.The results show that the wear amount distribution on the bearing’s inner surface is uneven in the axial and radial directions due to the journal’s stochastic oscillations.The maximum wear depth locates where at the bearing’s edges the motion direction of the follower shifts.These find-ings help to seek the revolute joints’wear-prone parts and enhance their durability and reliability through improved design.
基金Sponsored by the Shandong Key Research and Development Public Welfare Program(Grant No.2019GGX104011)the Natural Science Foundation of Shandong Province(Grant No.ZR2017MEE066).
文摘There are clearances in mechanism because of manufacture and assembly error,which reduces operation life and working accuracy of mechanism and has a great impact on dynamical responses.At the moment,research in this area mainly focuses on single degree⁃of⁃freedom mechanism considering one clearance,while research of multi⁃DOF mechanism considering multi⁃clearance is less.With the purpose of studying the dynamical characteristics of complex multi⁃DOF mechanism with multi⁃clearances,a dynamic model was developed.The dynamic responses of 2⁃DOF mechanism with two clearances under different positions,values,and numbers of clearance were analyzed.The displacement,velocity,acceleration,collision force,and the axis trajectory at clearance were then given.In addition,there is a limited amount of literature on chaotic phenomena,which mainly focuses on the chaotic phenomena of end⁃effector of mechanism.But in this paper,the non⁃linear characteristics were analyzed by chaotic phenomenon of clearance joint,then chaotic phenomenon was identified by Poincarémappings and phase diagrams.Bifurcation diagrams were given.The results will offer a reliable technical support for the study of dynamical responses of planar mechanisms and the analysis of chaotic phenomena.
文摘Clearances in joints of a mechanical multibody system can induce impulsive forces, leading to vibrations that compromise the system’s reliability, stability, and lifespan. Through dynamic analysis, designers can investigate the effects of the clearances on the dynamics of the multibody system. A revolute joint with clearance exhibits three motions which are;free-flight, impact and continuous contact motion modes. Therefore, a multibody system with n-number of revolute clearance joints will exhibit 3n motion modes which are a combination of the three motions in each joint. This study investigates experimentally the nine motion modes in a mechanical system with two revolute clearance joints. A slider crank mechanism has been used as the demonstrative example. We observed that the experimental curve exhibits a greater impact compared to the simulation curve. In conclusion, this experimental investigation offers valuable insights into the dynamics of planar mechanical systems with multiple clearance revolute joints. Utilizing a slider-crank mechanism for data acquisition, the study successfully confirmed seven out of nine motion modes previously identified in numerical research. The missing modes are attributed to inherent complexities in real-world systems, such as journal-bearing misalignment.
基金supported by the National Natural Science Foundation of China(Grant No.51175409)
文摘A stationary clearance link algorithm(SCLA)for calculating the reaction-force of revolute clearance joints in crank slider mechanisms is proposed in this paper.The SCLA is more efficient than other algorithms of the same accuracy.Furthermore,based on the Winkler foundation model,an unsymmetrical Winkler foundation model and a double elastic layer Winkler model are proposed.By integrating a dynamic model and the unsymmetrical Winkler foundation model with Archard wear model,an improved integrated wear prediction model is also generated.A series of experiments have been performed to compare with the predicted analysis data,and the results showed a good agreement.As a real industry application,with the double elastic layer Winkler model,the integrated wear prediction model was successfully used to predict the wear depth of the joint bearing(bimetallic bearing)for the cantilever crane of a concrete pump truck of Sany Heavy Industry.
基金funded in part by the German Research Foundation(Grant reference:496846758).
文摘The ongoing revolution in information technology is reshaping human life. In the realm of health behavior, wearable technology emerges as a leading digital solution,capturing physical behaviors (i.e., physical activity, sedentary habits, sleep patterns) within the 24-h cycle of daily life. Wearables are applied in research, clinical practice, and as lifestyle devices;most obvious, they promise to be a key element for increasing human physical activity, one of the biggest health challenges nowadays.
文摘In the dynamic landscape of modern healthcare and precision medicine,the digital revolution is reshaping medical industries at an unprecedented pace,and traditional Chinese medicine(TCM)is no exception[1-4].The paper“From digits towards digitization:the past,present,and future of traditional Chinese medicine”by Academician&TCM National Master Qi WANG(王琦).
文摘Aquiet revolution is underway in the vast cotton fields of Bortala Mongolian Autonomous Prefecture in north Xinjiang where harvesting machines,guided by digital sensors,operate with minimal human intervention.According to Aoqierbate,head of the prefecture’s Bureau of Agriculture and Rural Affairs,now hundreds of hectares of cotton can be harvested by just one or two machine operators.
文摘On 30 September 2024,the UK shuttered its last remaining coal-fired power plant[1].The closure marks a historic milestone,the end of 142 years of coal fueled prosperity.The country opened the world’s first plant to supply electric streetlamps in 1882,spark-ing a global energy revolution that has led to today’s nearly univer-sally electrified world.
文摘Strategic emerging industries represent the forefront of the new technological revolution and industrial transformation,serving as a critical domain for China to cultivate new growth drivers and establish competitive advantages.The development of these industries has become a major strategy for leading countries to attain competitive advantages in the new wave of economic and technological advancement.The ongoing energy revolution is driving the transition of traditional energy systems toward green and low-carbon models,while simultaneously fostering emerging industrial clusters such as new energy equipment manufacturing,energy storage,and energy internet.Energy companies are accelerating the deployment of innovative models that integrate new and traditional energy systems through technological and business model innovation.This study systematically analyzes the current status,trends,opportunities,and challenges faced by energy companies venturing into strategic emerging industries.The findings aim to guide energy companies in navigating the dual imperatives of energy transition and industrial upgrading,thereby contributing to sustainable development and global competitiveness.
文摘The metaverse is seen as the next technological revolution and tipped to generate up to$5 trillion in value by 2030,worldwide.However,many questions remain,and moving too fast could be detrimental if issues like privacy and interoperability are not ironed out soon.So what exactly is the metaverse and how can standards help?
文摘After graduating from the China Academy of Arts(Department of Oil Painting)in Hangzhou in 1995,Yang Fudong(1971)moved to Shanghai to work as a graphic designer.Inspired by his daily job in Pudong,he started producing photographic series that closely resembled the advertising campaigns he worked on.Glossy images of stylish young people or dishevelled white collars in highly saturated colours,defined“intellectuals”in cryptic accompanying captions.Conversely,his body of work in black and white,almost entirely shot on 35mm film,portrays a suspended reality out of the historical time:a ghostly dimension akin to a drowsy vigil,a uchronia,an“estranged paradise”-to borrow the title of his earliest film set in Hangzhou.But it is Shanghai’s elusiveness and material relationship with the past that has contributed the most to form Yang’s trademark imagery and aesthetic.What he conjures up in his still and moving images,is a dimension with a distinctive oneiric quality,an“in-between”universe where all the circumstances are justified and have an inner logic,just like in dreams,or just like in the China of his childhood.The research of Yang Fudong is somewhat unique in the universe of contemporary Chinese art and sets him apart from a plethora of artists that have used the video in a much more“didactic”and quotational way.I will illustrate some specific aspects of his black and white body of work,trying to show how a certain self-orientalist trait can be interpreted as strategy to regain narrative agency and bring to the surface a series of removed instances:the main of which being,in my opinion,the fate of Shanghai’s(perhaps of China's Mainland in its ungraspable entirety?)modernity.
文摘In this conceptual paper,the author develops and presents a strategic decision-making framework that applies game theory to evaluate smart and natural farming approaches in India.In the face of increasing pressures from climate change,resource scarcity,and evolving socio-economic landscapes,agriculture must adapt to the challenges of a volatile,uncertain,complex,and ambiguous(VUCA)world.When integrated with the Provision of Urban Amenities in Rural Areas(PURA)framework,VUCA offers a dynamic system perspective that contextualizes uncertainty and institutional capacity in farming systems.This study applies a modified Spence signaling model to capture how farmers-categorized as smart or natural versus conventional-choose to signal their sustainability credentials in an environment of asymmetric information.Using a combination of payoff matrix modelling,Bayesian belief updating,and evolutionary game simulations,the paper identifies strategic equilibria under varying levels of policy support,consumer trust,and signal cost.Farmers’decisions to adopt smart technologies or organic certifications are modelled as costly but credible signals of quality.These signals are then interpreted by receivers such as consumers,investors,or policymakers,who in turn adjust their support or market preferences.The analysis reveals conditions under which separating,pooling,and semi-separating equilibria emerge,and how these outcomes impact farmer behaviour and systemic sustainability.Case studies from Indian states such as Andhra Pradesh,Karnataka,and Punjab demonstrate how real-world farming programs mirror theoretical outcomes under different signalling strategies.The study also presents a robust methodological structure,combining conceptual modelling with policy simulation and validation through comparative cases.By integrating environmental,technological,and institutional perspectives,this paper contributes a hybrid strategic framework aligned with India’s Green Revolution 2.0 goals.It offers practical recommendations for policy design,infrastructure planning,and market mechanisms that support the scaling of sustainable agricultural practices through credible signalling and game-theoretic insights.
文摘The Mexican mural movement,also known as Mexican muralism,is recognized as one of the most significant art movements of the 20th century.It developed in the aftermath of the Mexican Revolution,which took place between 1910 and 1920.The country was striving to rebuild and unify after years of conflict,and muralism became a powerful tool for this transformation.
文摘Artificial intelligence has the potential to stand as the cornerstone of human society,which could drive our civilization forward and emerge as a pivotal frontier in the ongoing technological revolution and industrial transformation.Amidst profound shifts in the global technological landscape,smart materials,smart devices,and smart systems have become the defining pillars of our era,which will catalyze paradigm shifts in engineering science and reshape the trajectory of modern technology.
