Recently, the theory of valuations on function spaces has been rapidly growing. It is more general than the classical theory of valuations on convex bodies. In this paper, all continuous, SL(n) and translation invaria...Recently, the theory of valuations on function spaces has been rapidly growing. It is more general than the classical theory of valuations on convex bodies. In this paper, all continuous, SL(n) and translation invariant valuations on concave functions and log-concave functions are completely classified, respectively.展开更多
In this paper, a class of fire-new general integral control, named general concave integral control, is proposed. It is derived by normalizing the bounded integral control action and concave function gain integrator, ...In this paper, a class of fire-new general integral control, named general concave integral control, is proposed. It is derived by normalizing the bounded integral control action and concave function gain integrator, introducing the partial derivative of Lyapunov function into the integrator and originating a class of new strategy to transform ordinary control into general integral control. By using Lyapunov method along with LaSalle’s invariance principle, the theorem to ensure regionally as well as semi-globally asymptotic stability is established only by some bounded information. Moreover, the highlight point of this integral control strategy is that the integrator output could tend to infinity but the integral control action is finite. Therefore, a simple and ingenious method to design general integral control is founded. Simulation results showed that under the normal and perturbed cases, the optimum response in the whole domain of interest can all be achieved by a set of the same control gains, even under the case that the payload is changed abruptly.展开更多
In this paper, the authors show some monotonicity and concavity of the classical psi function, by which several known results are improved and some new asymptotically sharp estimates are obtained for this function. In...In this paper, the authors show some monotonicity and concavity of the classical psi function, by which several known results are improved and some new asymptotically sharp estimates are obtained for this function. In addition, applying the new results to the psi function, the authors improve the well-known lower and upper bounds for the approximate evaluation of Euler＇s constant γ.展开更多
The classical definition of Steiner symmetrizations of functions are defined according to the Steiner symmetrizations of function level sets and the layered representation of functions.In this paper,the definition is ...The classical definition of Steiner symmetrizations of functions are defined according to the Steiner symmetrizations of function level sets and the layered representation of functions.In this paper,the definition is not only transformed into Steiner symmetrizations of one-dimensional parabolic functions,but also depends on the Steiner symmetrizations of the level sets of log-concave functions.To this end we prove Steiner’s inequality on layering functions in the space of log-concave functions.展开更多
This paper shows some properties of symmetry function induced by a convex body in a normal linear space. Some relationships between symmetry function induced by a convex body and Minkowski functional of the convex bod...This paper shows some properties of symmetry function induced by a convex body in a normal linear space. Some relationships between symmetry function induced by a convex body and Minkowski functional of the convex body are presented.展开更多
Electrochemical N_(2) reduction has emerged as an eco-friendly and sustainable alternative for industrial NH_(3) synthesis with the aid of efficient electrocatalysts under ambient conditions.Herein,we report that CuS ...Electrochemical N_(2) reduction has emerged as an eco-friendly and sustainable alternative for industrial NH_(3) synthesis with the aid of efficient electrocatalysts under ambient conditions.Herein,we report that CuS concave polyhedral superstructures (CuS-CPSs) with high symmetry operate as capable electrocatalysts for artificial NH_(3) production with excellent selectivity.In 0.1 M HCl,CuS-CPSs achieve an appealing NH_(3) yield of 18.18 μg h^(−1) mg^(−1) cat.and a faradaic efficiency of 5.63% at −0.15 V vs.reversible hydrogen electrode.Moreover,it also shows high electrochemical and structural stability.The catalytic mechanism of N_(2) reduction on CuS (103) is further discussed using density functional theory calculations.展开更多
基金Supported by Foundation of China Scholarship Council(201808430267)the Education Department of Hunan Province(16C0635)the Natural Science Foundation of Hunan Province(2017JJ3085)
文摘Recently, the theory of valuations on function spaces has been rapidly growing. It is more general than the classical theory of valuations on convex bodies. In this paper, all continuous, SL(n) and translation invariant valuations on concave functions and log-concave functions are completely classified, respectively.
文摘In this paper, a class of fire-new general integral control, named general concave integral control, is proposed. It is derived by normalizing the bounded integral control action and concave function gain integrator, introducing the partial derivative of Lyapunov function into the integrator and originating a class of new strategy to transform ordinary control into general integral control. By using Lyapunov method along with LaSalle’s invariance principle, the theorem to ensure regionally as well as semi-globally asymptotic stability is established only by some bounded information. Moreover, the highlight point of this integral control strategy is that the integrator output could tend to infinity but the integral control action is finite. Therefore, a simple and ingenious method to design general integral control is founded. Simulation results showed that under the normal and perturbed cases, the optimum response in the whole domain of interest can all be achieved by a set of the same control gains, even under the case that the payload is changed abruptly.
基金Supported by the National Natural Science Foundation of China(11171307)
文摘In this paper, the authors show some monotonicity and concavity of the classical psi function, by which several known results are improved and some new asymptotically sharp estimates are obtained for this function. In addition, applying the new results to the psi function, the authors improve the well-known lower and upper bounds for the approximate evaluation of Euler＇s constant γ.
基金the National Natural Science Foundation of China(11971080)Science and Technology Research Program of Chongqing Municipal Education Commission(KJQN202000838)+1 种基金the Basic and Advanced Research Project of Chongqing(cstc2018jcyj AX0790,cstc2020jcyj-msxm X0328)the Innovative Project of Chongqing Technology and Business University(yjscxx2021-112-56)。
文摘The classical definition of Steiner symmetrizations of functions are defined according to the Steiner symmetrizations of function level sets and the layered representation of functions.In this paper,the definition is not only transformed into Steiner symmetrizations of one-dimensional parabolic functions,but also depends on the Steiner symmetrizations of the level sets of log-concave functions.To this end we prove Steiner’s inequality on layering functions in the space of log-concave functions.
基金Supported by the Natural Science Foundation of China（10771086） Supported by the Natural Science Foundation of Fujian Province（S0650021）
文摘This paper shows some properties of symmetry function induced by a convex body in a normal linear space. Some relationships between symmetry function induced by a convex body and Minkowski functional of the convex body are presented.
文摘Electrochemical N_(2) reduction has emerged as an eco-friendly and sustainable alternative for industrial NH_(3) synthesis with the aid of efficient electrocatalysts under ambient conditions.Herein,we report that CuS concave polyhedral superstructures (CuS-CPSs) with high symmetry operate as capable electrocatalysts for artificial NH_(3) production with excellent selectivity.In 0.1 M HCl,CuS-CPSs achieve an appealing NH_(3) yield of 18.18 μg h^(−1) mg^(−1) cat.and a faradaic efficiency of 5.63% at −0.15 V vs.reversible hydrogen electrode.Moreover,it also shows high electrochemical and structural stability.The catalytic mechanism of N_(2) reduction on CuS (103) is further discussed using density functional theory calculations.
