讨论了利用外部混沌信号或神经元膜电压实现两个初始条件不同的非耦合Hindmarsh Rose (HR)神经元的同步问题:利用外部混沌信号调制两个相同的非耦合HR神经元的某些参数,当刺激强度达到某一阈值时最大条件Lyapunov指数(LCLE)变负,两个系...讨论了利用外部混沌信号或神经元膜电压实现两个初始条件不同的非耦合Hindmarsh Rose (HR)神经元的同步问题:利用外部混沌信号调制两个相同的非耦合HR神经元的某些参数,当刺激强度达到某一阈值时最大条件Lyapunov指数(LCLE)变负,两个系统可实现完全同步;利用混沌信号调制两个存在参数差的非耦合HR神经元的输入电流,当刺激强度达到某一阈值时两个系统的最大条件Lyapunov指数都变负,两个HR神经元将实现相位同步.此项研究从实验的角度为实现非耦合神经元同步提供了可行的方法,为今后研究更加复杂的神经元系统打下了一定的理论基础.展开更多
The development of functional composites with excellent thermal management capabilities and electro-magnetic interference(EMI)shielding has become extremely urgent for keeping up with the continuous improvement of the...The development of functional composites with excellent thermal management capabilities and electro-magnetic interference(EMI)shielding has become extremely urgent for keeping up with the continuous improvement of the operating speed and efficiency for electronic equipment.In this study,the biolog-ical wood-derived porous carbon(WPC)was determined as the supporting material to encapsulating polyethylene glycol(PEG),and a series of WPC/PEG/Fe_(3)O_(4) phase change composites(PCCs)with excel-lent shape stability,EMI shielding and thermal management capabilities were prepared via a simple vac-uum impregnation method.The Fe_(3)O_(4) magnetic particles modified PCCs have greatly improved the EMI shielding effectiveness(SE).The EMI SE of WP-4(7.5 wt.% Fe_(3)O_(4) in PEG)can be up to 55.08 dB between 8.2−12.4 GHz,however,the WP-0 without Fe_(3)O_(4) addition is only 40.08 dB.Meanwhile,the absorption ratio of electromagnetic waves(EMW)has also increased from 75.02%(WP-0)to 85.56%(WP-4),which effectively prevents secondary pollution.In addition,after wrapping a thin layer of polydimethylsiloxane resin(PDMS),the obtained WP-4 can maintain a high heat storage capacity(109.52 J/g)and good wa-ter stability.In short,the prepared WPC/PEG/Fe_(3)O_(4) PCCs have great potential application value in the thermal management and electromagnetic shielding requirements for electronic devices.展开更多
Soft tissue remodeling is a sophisticated process that sequentially provides dynamic biological signals to guide cell behavior.However,capturing these signals within hydrogel and directing over time has still been unr...Soft tissue remodeling is a sophisticated process that sequentially provides dynamic biological signals to guide cell behavior.However,capturing these signals within hydrogel and directing over time has still been unrealized owing to the poor comprehension of physiological processes.Here,a bio-mimicking hydrogel is designed via thiol-ene click reaction to capture the early physical signal triggered by inflammation,and the chemical signals provided with chemokine and natural adhesion sites,which guaranteed the precise soft tissue remodeling.This bio-mimicking hydrogel efficiently facilitated cell anchoring,migration,and invasion in the 3D matrix due to the permissive space and the interaction with integrin receptors.Besides,the covalently grafted chemokine-like peptide is optimal for colonization and functional differentiation of endothelial cells through a HIF-1αdependent signal pathway.Furthermore,the early polarization of macrophages,collagen deposition and angiogenesis in rat acute wound model,and the increased blood perfusion in mouse skin flap model have confirmed that the bio-mimicking hydrogel realized precise soft tissue remodeling and opens new avenues for the phased repair of different tissues such as nerve,myocardium,and even bone.展开更多
文摘讨论了利用外部混沌信号或神经元膜电压实现两个初始条件不同的非耦合Hindmarsh Rose (HR)神经元的同步问题:利用外部混沌信号调制两个相同的非耦合HR神经元的某些参数,当刺激强度达到某一阈值时最大条件Lyapunov指数(LCLE)变负,两个系统可实现完全同步;利用混沌信号调制两个存在参数差的非耦合HR神经元的输入电流,当刺激强度达到某一阈值时两个系统的最大条件Lyapunov指数都变负,两个HR神经元将实现相位同步.此项研究从实验的角度为实现非耦合神经元同步提供了可行的方法,为今后研究更加复杂的神经元系统打下了一定的理论基础.
基金supported by the National Key Technology R&D Program of China (Grant Nos. 2020YFB1709301 and 2020YFB1709304)the National Natural Science Foundation of China (No. 52173036 and 52073107)+3 种基金the Central University Basic Research Fund of China (Grants 2021XXJS035)the Innovation and Talent Recruitment Base of New Energy Chemistry and Device (Grants B21003)the Opening Project of Key Laboratory of Polymer Processing Engineering (South China University of Technology),Ministry of Education (Grant No. KFKT2002)fund from Henan University of Science and Technology (2020-RSC02)
文摘The development of functional composites with excellent thermal management capabilities and electro-magnetic interference(EMI)shielding has become extremely urgent for keeping up with the continuous improvement of the operating speed and efficiency for electronic equipment.In this study,the biolog-ical wood-derived porous carbon(WPC)was determined as the supporting material to encapsulating polyethylene glycol(PEG),and a series of WPC/PEG/Fe_(3)O_(4) phase change composites(PCCs)with excel-lent shape stability,EMI shielding and thermal management capabilities were prepared via a simple vac-uum impregnation method.The Fe_(3)O_(4) magnetic particles modified PCCs have greatly improved the EMI shielding effectiveness(SE).The EMI SE of WP-4(7.5 wt.% Fe_(3)O_(4) in PEG)can be up to 55.08 dB between 8.2−12.4 GHz,however,the WP-0 without Fe_(3)O_(4) addition is only 40.08 dB.Meanwhile,the absorption ratio of electromagnetic waves(EMW)has also increased from 75.02%(WP-0)to 85.56%(WP-4),which effectively prevents secondary pollution.In addition,after wrapping a thin layer of polydimethylsiloxane resin(PDMS),the obtained WP-4 can maintain a high heat storage capacity(109.52 J/g)and good wa-ter stability.In short,the prepared WPC/PEG/Fe_(3)O_(4) PCCs have great potential application value in the thermal management and electromagnetic shielding requirements for electronic devices.
基金This research was funded by The National Key Research and Development Program of China(2020YFA0908200)National Natural Science Foundation of China General Program(81930051)+3 种基金Postdoctoral Research Foundation of China(2020M681319)the Interdisciplinary Program of Shanghai Jiao Tong University(YG2019ZDA05 and ZH2018ZDA04)“The Project Supported by the Foundation of National Facility for Translational Medicine(Shanghai)(TMSK-2020-117)”Shanghai Municipal Education Commission-Gaofeng Clinical Medicine Grant Support(20171906).
文摘Soft tissue remodeling is a sophisticated process that sequentially provides dynamic biological signals to guide cell behavior.However,capturing these signals within hydrogel and directing over time has still been unrealized owing to the poor comprehension of physiological processes.Here,a bio-mimicking hydrogel is designed via thiol-ene click reaction to capture the early physical signal triggered by inflammation,and the chemical signals provided with chemokine and natural adhesion sites,which guaranteed the precise soft tissue remodeling.This bio-mimicking hydrogel efficiently facilitated cell anchoring,migration,and invasion in the 3D matrix due to the permissive space and the interaction with integrin receptors.Besides,the covalently grafted chemokine-like peptide is optimal for colonization and functional differentiation of endothelial cells through a HIF-1αdependent signal pathway.Furthermore,the early polarization of macrophages,collagen deposition and angiogenesis in rat acute wound model,and the increased blood perfusion in mouse skin flap model have confirmed that the bio-mimicking hydrogel realized precise soft tissue remodeling and opens new avenues for the phased repair of different tissues such as nerve,myocardium,and even bone.
