Wearable devices have great application potential in the next generation of smart portable electronics,especially in the fields of medical monitoring,soft robotics,artificial intelligence,and human-machine interfaces....Wearable devices have great application potential in the next generation of smart portable electronics,especially in the fields of medical monitoring,soft robotics,artificial intelligence,and human-machine interfaces.Piezoelectric flexible strain sensors are key components of wearable devices.However,existing piezoelectric flexible strain sensors have certain limitations in weak signal monitoring due to their large modulus and low sensitivity.To solve this problem,the concept of Kirigami(paper-cutting)was introduced in this study to design the sensor structure.By comparing the Kirigami structures of different basic structures,the serpentine structure was determined as the basic configuration of the sensor.The serpentine structure not only provides excellent tensile properties,but also significantly improves the sensitivity of the sensor,which performs well in monitoring weak signals.On this basis,the adhesion properties of the flexible sensor were analyzed and tested,and the optimal ratio of the substrate was selected for preparation.In addition,a low-cost and rapid prototyping process for stretchable patches was established in this study.Using this technology,we prepared the sensor device and tested its performance.Finally,we successfully developed a flexible sensor with a sensitivity of 0.128 mV/μɛand verified its feasibility for wrist joint motion monitoring applications.This result opens up new avenues for the recovery care of tenosynovitis patients after surgery.展开更多
Part of the article is to study the intersection of two areas： the study of conservation facts oral traditions, intercultural dimensions and social dynamics induced by ICT. On the one hand, oral traditions, their pop...Part of the article is to study the intersection of two areas： the study of conservation facts oral traditions, intercultural dimensions and social dynamics induced by ICT. On the one hand, oral traditions, their popular character, manifest themselves in public in well-defined circumstances. All the techniques of literary invention and social diffusion contribute to evoke a legendary past but also to think about the present. On the other hand, the latest ICT developments may cause contrasting effects： on the one hand, they give unexpected ways （＂a historic opportunity＂） to fight the inevitable decline of oral traditions and to bring the collection and transmission of these oral traditions to a level they had never met; on the other hand, ICTs are a part of a modernity that speeds to abandon ancient traditions and convenes content and modes of narration and representation based on a worldview defined. The set highlights a participatory strategy. This is part of an action research. In other words, it tends to work on the complexity of the situations, the dynamics of the process, the comprehensiveness, and the systemic, social, technological, and cultural forms.展开更多
The present article deals with the duties, role and methodical peculiarities of a cinematographer in creating a feature film. The development of creating artistic works in the high creative level and its process is co...The present article deals with the duties, role and methodical peculiarities of a cinematographer in creating a feature film. The development of creating artistic works in the high creative level and its process is comparatively analyzed within the progress of the Uzbek cinematography.展开更多
We applied the method of Thermomechanical Dynamics (TMD) to a low-temperature Stirling engine, and the dissipative equation of motion and time-evolving physical quantities are self-consistently calculated for the firs...We applied the method of Thermomechanical Dynamics (TMD) to a low-temperature Stirling engine, and the dissipative equation of motion and time-evolving physical quantities are self-consistently calculated for the first time in this field. The thermomechanical states of the heat engine are in Nonequilibrium Irreversible States (NISs), and time-dependent thermodynamic work W(t), internal energy E(t), energy dissipation or entropy Q<sub>d</sub>(t), and temperature T(t), are precisely studied and computed in TMD. We also introduced the new formalism, Q(t)-picture of thermodynamic heat-energy flows, for consistent analyses of NISs. Thermal flows in a long-time uniform heat flow and in a short-time heat flow are numerically studied as examples. In addition to the analysis of time-dependent physical quantities, the TMD analysis suggests that the concept of force and acceleration in Newtonian mechanics should be modified. The acceleration is defined as a continuously differentiable function of Class C<sup>2</sup> in Newtonian mechanics, but the thermomechanical dynamics demands piecewise continuity for acceleration and thermal force, required from physical reasons caused by frictional variations and thermal fluctuations. The acceleration has no direct physical meaning associated with force in TMD. The physical implications are fundamental for the concept of the macroscopic phenomena in NISs composed of systems in thermal and mechanical motion.展开更多
基金supported by National Natural Science Foundation of China(Nos.62301509,62304209)Key Research and Development Program of Shanxi Province(No.202302030201001)Fundamental Research Program of Shanxi Province(Nos.202203021222079,0210302123203,202103021223185).
文摘Wearable devices have great application potential in the next generation of smart portable electronics,especially in the fields of medical monitoring,soft robotics,artificial intelligence,and human-machine interfaces.Piezoelectric flexible strain sensors are key components of wearable devices.However,existing piezoelectric flexible strain sensors have certain limitations in weak signal monitoring due to their large modulus and low sensitivity.To solve this problem,the concept of Kirigami(paper-cutting)was introduced in this study to design the sensor structure.By comparing the Kirigami structures of different basic structures,the serpentine structure was determined as the basic configuration of the sensor.The serpentine structure not only provides excellent tensile properties,but also significantly improves the sensitivity of the sensor,which performs well in monitoring weak signals.On this basis,the adhesion properties of the flexible sensor were analyzed and tested,and the optimal ratio of the substrate was selected for preparation.In addition,a low-cost and rapid prototyping process for stretchable patches was established in this study.Using this technology,we prepared the sensor device and tested its performance.Finally,we successfully developed a flexible sensor with a sensitivity of 0.128 mV/μɛand verified its feasibility for wrist joint motion monitoring applications.This result opens up new avenues for the recovery care of tenosynovitis patients after surgery.
文摘Part of the article is to study the intersection of two areas： the study of conservation facts oral traditions, intercultural dimensions and social dynamics induced by ICT. On the one hand, oral traditions, their popular character, manifest themselves in public in well-defined circumstances. All the techniques of literary invention and social diffusion contribute to evoke a legendary past but also to think about the present. On the other hand, the latest ICT developments may cause contrasting effects： on the one hand, they give unexpected ways （＂a historic opportunity＂） to fight the inevitable decline of oral traditions and to bring the collection and transmission of these oral traditions to a level they had never met; on the other hand, ICTs are a part of a modernity that speeds to abandon ancient traditions and convenes content and modes of narration and representation based on a worldview defined. The set highlights a participatory strategy. This is part of an action research. In other words, it tends to work on the complexity of the situations, the dynamics of the process, the comprehensiveness, and the systemic, social, technological, and cultural forms.
文摘The present article deals with the duties, role and methodical peculiarities of a cinematographer in creating a feature film. The development of creating artistic works in the high creative level and its process is comparatively analyzed within the progress of the Uzbek cinematography.
文摘We applied the method of Thermomechanical Dynamics (TMD) to a low-temperature Stirling engine, and the dissipative equation of motion and time-evolving physical quantities are self-consistently calculated for the first time in this field. The thermomechanical states of the heat engine are in Nonequilibrium Irreversible States (NISs), and time-dependent thermodynamic work W(t), internal energy E(t), energy dissipation or entropy Q<sub>d</sub>(t), and temperature T(t), are precisely studied and computed in TMD. We also introduced the new formalism, Q(t)-picture of thermodynamic heat-energy flows, for consistent analyses of NISs. Thermal flows in a long-time uniform heat flow and in a short-time heat flow are numerically studied as examples. In addition to the analysis of time-dependent physical quantities, the TMD analysis suggests that the concept of force and acceleration in Newtonian mechanics should be modified. The acceleration is defined as a continuously differentiable function of Class C<sup>2</sup> in Newtonian mechanics, but the thermomechanical dynamics demands piecewise continuity for acceleration and thermal force, required from physical reasons caused by frictional variations and thermal fluctuations. The acceleration has no direct physical meaning associated with force in TMD. The physical implications are fundamental for the concept of the macroscopic phenomena in NISs composed of systems in thermal and mechanical motion.
