Living organisms are capable of dynamically changing their structures for adaptive functions through sophisticated reaction-diffusion processes. Here we show how active supramolecular hydrogels with programmable lifet...
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Living organisms are capable of dynamically changing their structures for adaptive functions through sophisticated reaction-diffusion processes. Here we show how active supramolecular hydrogels with programmable lifetimes and macroscopic structures can be created by relying on a simple reaction-diffusion strategy. Two hydrogel precursors (poly(acrylic acid) PAA/CaCl 2 and Na 2 CO 3 ) diffuse from different locations and generate amorphous calcium carbonate (ACC) nanoparticles at the diffusional fronts, leading to the formation of hydrogel structures driven by electrostatic interactions between PAA and ACC nanoparticles. Interestingly, the formed hydrogels are capable of autonomously disintegrating over time because of a delayed influx of electrostatic-interaction inhibitors (NaCl). The hydrogel growth process is well explained by a reaction-diffusion model which offers a theoretical means to program the dynamic growth of structured hydrogels. Furthermore, we demonstrate a conceptual access to dynamic information storage in soft materials using the developed reaction-diffusion strategy. This work may serve as a starting point for the development of life-like materials with adaptive structures and functionalities.
Certain types of rocket engine pipes can only be cut perpendicular to the axis when cutting margins. In order to verify whether the pipeline can achieve the cutting margin perpendicular to the axis by correcting the b...
Certain types of rocket engine pipes can only be cut perpendicular to the axis when cutting margins. In order to verify whether the pipeline can achieve the cutting margin perpendicular to the axis by correcting the bend angle, and finally perform accurate assembly, a verification method based on SolidWorks to simulate the pipe shaping process is proposed. First, the pipe model was reconstructed by using the measurement data. Second, the lengths of the pipe segments, the angles between the line segments and the angles between adjacent surfaces were extracted. Third, the simplified pipe model and interface model were established and assembled in SolidWorks. Finally, the angle constraints of the adjacent surfaces were added, and the angle constraints of the line segments were released. According to the assembly results, the feasibility of solving the problem through shape correction was analysed. Experiments show that this method can effectively verify the feasibility of the shape of the elbow, and also provide the shape of the pipe after the correction and the angle of each elbow.
Artificial Intelligence-Generated Content (AIGC) is an automated method for generating, manipulating, and modifying valuable and diverse data using AI algorithms creatively. This survey paper focuses on the deployment...
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In this paper, a sliding mode control method for manipulator in the presence of external disturbance is addressed. Firstly, the dynamic model of n-joint manipulator system is introduced. Secondly, aiming at a manipula...
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In this paper, a sliding mode control method for manipulator in the presence of external disturbance is addressed. Firstly, the dynamic model of n-joint manipulator system is introduced. Secondly, aiming at a manipulator system with disturbance, a novel dynamic sliding mode controller based on adaptive technique is proposed, in which the parameter of external disturbance is estimated and updated by online adaptive method. Further, the stability of the overall system under this controller is verified based on Lyapunov theorem. Besides, through this method, there is no need to obtain the precise value of disturbance. Finally,experimental results demonstrate that the controller proposed in this work has strong robustness for disturbance, meanwhile can effectively reduce the chattering.
作者：
Linbo LiTao DongInstitute of Applied Micro-Nano Science and Technology – IAMNST
Chongqing Key Laboratory of Colleges and Universities on Micro-Nano Systems Technology and Smart Transducing Chongqing Engineering Laboratory for Detection Control and Integrated System National Research Base of Intelligent Manufacturing Service Chongqing Technology and Business University Nan'an District 400067 Chongqing China Institute for Microsystems – IMS
Faculty of Technology Natural Sciences and Maritime Sciences University of South-Eastern Norway Postboks 235 3603 Kongsberg Norway
Correction for ‘Photoluminescence tuning in carbon dots: surface passivation or/and functionalization, heteroatom doping’ by Linbo Li et al., J. Mater. Chem. C, 2018, 6, 7944–7970.
Correction for ‘Photoluminescence tuning in carbon dots: surface passivation or/and functionalization, heteroatom doping’ by Linbo Li et al., J. Mater. Chem. C, 2018, 6, 7944–7970.
Molecular Mechanics Poisson-Boltzmann Surface Area (MM-PBSA) is arguably the most popular method for free binding energy prediction since it is considerably more accurate than docking or scoring methods, but considera...
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