The article describes ethylene polymerization reactions with transition metal catalysts based on complexes of CoCl_(2) and FeCl_(2) with an N,N,N-tridentate ligand 2,6-bis[1-(2,6-dimethylphenylimino)ethyl]pyridine. Th...The article describes ethylene polymerization reactions with transition metal catalysts based on complexes of CoCl_(2) and FeCl_(2) with an N,N,N-tridentate ligand 2,6-bis[1-(2,6-dimethylphenylimino)ethyl]pyridine. The complexes are converted into polymerization catalysts by reacting them either with polymethylalumoxane (MAO) or with a combination of Al(C2H5)2Cl and Mg(C4H9)2 at an [Al]:[Mg] ratio of ~3. Both MAO-activated complexes readily polymerize ethylene at 35 ℃ with the formation of linear, low molecular weight polymers with a narrow molecular weight distribution. The same complexes, when activated with the Al(C2H5)2Cl-Mg(C4H9)2 combination, form multi-center catalysts and generate polyethylenes with a broad molecular weight distribution.展开更多
All-optically controlled artificial synapses for neuromorphic vision offer unique advantages in simplifying circuit design and minimizing power consumption,meeting the application demands of the current artificial int...All-optically controlled artificial synapses for neuromorphic vision offer unique advantages in simplifying circuit design and minimizing power consumption,meeting the application demands of the current artificial intelligence era.However,developing all-optically controlled devices that combine high performance and high reproducibility remains a significant challenge.In this work,we demonstrate an all-optically controlled artificial synapse based on ZnO and Cs_(2)CoCl_(4)single crystal connected structure,which integrates light information sensing and processing capabilities.Relying on the simple series-connected structure,as well as the positive photoconductance of ZnO and the negative photoconductance of Cs_(2)CoCl_(4),the optically controlled bidirectional synaptic plasticity is realized under ultraviolet and visible light stimulation without additional voltage modulation in the all-optically controlled synapse.In addition,leveraging its ultraviolet-enhanced feature extraction and visible-suppression capabilities,the all-optically controlled synapse can act as denoising units in bioinformation preprocessing and weight-updating units in feature recognition.The proposed all-optically controlled synapses exhibit excellent information perception,low-level noise reduction,and high-level cognition functions for bioinformation recognition under complex light conditions.We believe that this work can provide structural-level insights and inspirations in the design and fabrication of all-optically controlled synapses to promote the application for efficient neuromorphic vision in the future.展开更多
基金carried out according to the program of Fundamental Scientific Research of the Russian Federation
文摘The article describes ethylene polymerization reactions with transition metal catalysts based on complexes of CoCl_(2) and FeCl_(2) with an N,N,N-tridentate ligand 2,6-bis[1-(2,6-dimethylphenylimino)ethyl]pyridine. The complexes are converted into polymerization catalysts by reacting them either with polymethylalumoxane (MAO) or with a combination of Al(C2H5)2Cl and Mg(C4H9)2 at an [Al]:[Mg] ratio of ~3. Both MAO-activated complexes readily polymerize ethylene at 35 ℃ with the formation of linear, low molecular weight polymers with a narrow molecular weight distribution. The same complexes, when activated with the Al(C2H5)2Cl-Mg(C4H9)2 combination, form multi-center catalysts and generate polyethylenes with a broad molecular weight distribution.
基金supported by the National Natural Science Foundation of China(nos.62461160330,62304021,and 62404018)the Hebei Natural Science Foundation(F2024105006),the China Postdoctoral Science Foundation(2024T171120 and 2023M740232)the Postdoctoral Fellowship Program of China Postdoctoral Science Foundation(CPSF)(GZB20230932).
文摘All-optically controlled artificial synapses for neuromorphic vision offer unique advantages in simplifying circuit design and minimizing power consumption,meeting the application demands of the current artificial intelligence era.However,developing all-optically controlled devices that combine high performance and high reproducibility remains a significant challenge.In this work,we demonstrate an all-optically controlled artificial synapse based on ZnO and Cs_(2)CoCl_(4)single crystal connected structure,which integrates light information sensing and processing capabilities.Relying on the simple series-connected structure,as well as the positive photoconductance of ZnO and the negative photoconductance of Cs_(2)CoCl_(4),the optically controlled bidirectional synaptic plasticity is realized under ultraviolet and visible light stimulation without additional voltage modulation in the all-optically controlled synapse.In addition,leveraging its ultraviolet-enhanced feature extraction and visible-suppression capabilities,the all-optically controlled synapse can act as denoising units in bioinformation preprocessing and weight-updating units in feature recognition.The proposed all-optically controlled synapses exhibit excellent information perception,low-level noise reduction,and high-level cognition functions for bioinformation recognition under complex light conditions.We believe that this work can provide structural-level insights and inspirations in the design and fabrication of all-optically controlled synapses to promote the application for efficient neuromorphic vision in the future.
