Actin cytoskeleton plays crucial roles in various cellular functions.Extracellular matrix(ECM)can modulate cell morphology by remodeling the internal cytoskeleton.To define how geometry of ECM regulates the organizati...Actin cytoskeleton plays crucial roles in various cellular functions.Extracellular matrix(ECM)can modulate cell morphology by remodeling the internal cytoskeleton.To define how geometry of ECM regulates the organization of actin cytoskeleton,we plated individual NIH 3T3 cells on micropatterned substrates with distinct shapes and sizes.It was found that the stress fibers could form along the nonadhesive edges of T-shaped pattern,but were absent from the opening edge of V-shaped pattern,indicating that the organization of actin cytoskeleton was dependent on the mechanical environment.Furthermore,a secondary actin ring was observed on 50μm circular pattern while did not appear on 30μm and 40μm pattern,showing a size-dependent organization of actin cytoskeleton.Finally,osteoblasts,MDCK and A549 cells exhibited distinct organization of actin cytoskeleton on T-shaped pattern,suggesting a cell-type specificity in arrangement of actin cytoskeleton.Together,our findings brought novel insight into the organization of actin cytoskeleton on micropatterned environments.展开更多
Cells are highly sensitive to their geometrical and mechanical microenvironment that directly regulate cell shape,cytoskeleton and organelle,as well as the nucleus morphology and genetic expression.The emerging two-di...Cells are highly sensitive to their geometrical and mechanical microenvironment that directly regulate cell shape,cytoskeleton and organelle,as well as the nucleus morphology and genetic expression.The emerging two-dimensional micropatterning techniques offer powerful tools to construct controllable and well-organized microenvironment for single-cell level investigations with qualitative analysis,cellular standardization,and in vivo environment mimicking.Here,we provide an overview of the basic principle and characteristics of the two most widely-used micropatterning techniques,including photolithographic micropatterning and soft lithography micropatterning.Moreover,we summarize the application of micropatterning technique in controlling cytoskeleton,cell migration,nucleus and gene expression,as well as intercellular communication.展开更多
Monolithic textured perovskite/silicon tandem solar cells(TSCs)are expected to achieve maximum light capture at the lowest cost,potentially exhibiting the best power conversion efficiency.However,it is challenging to ...Monolithic textured perovskite/silicon tandem solar cells(TSCs)are expected to achieve maximum light capture at the lowest cost,potentially exhibiting the best power conversion efficiency.However,it is challenging to fabricate high-quality perovskite films and preferred crystal orientation on commercially textured silicon substrates with micrometersize pyramids.Here,we introduced a bulky organic molecule(4-fluorobenzylamine hydroiodide(F-PMAI))as a perovskite additive.It is found that F-PMAI can retard the crystallization process of perovskite film through hydrogen bond interaction between F^(−)and FA^(+)and reduce(111)facet surface energy due to enhanced adsorption energy of F-PMAI on the(111)facet.Besides,the bulky molecular is extruded to the bottom and top of perovskite film after crystal growth,which can passivate interface defects through strong interaction between F-PMA+and undercoordinated Pb^(2+)/I^(−).As a result,the additive facilitates the formation of large perovskite grains and(111)preferred orientation with a reduced trap-state density,thereby promoting charge carrier transportation,and enhancing device performance and stability.The perovskite/silicon TSCs achieved a champion efficiency of 30.05%based on a silicon thin film tunneling junction.In addition,the devices exhibit excellent longterm thermal and light stability without encapsulation.This work provides an effective strategy for achieving efficient and stable TSCs.展开更多
We demonstrate a bipolar graphene/F_(16)CuPc synaptic transistor(GFST)with matched p-type and n-type bipolar properties,which emulates multiplexed neurotransmission of the release of two excitatory neurotransmitters i...We demonstrate a bipolar graphene/F_(16)CuPc synaptic transistor(GFST)with matched p-type and n-type bipolar properties,which emulates multiplexed neurotransmission of the release of two excitatory neurotransmitters in graphene and F_(16)CuPc channels,separately.This process facilitates fast-switching plasticity by altering charge carriers in the separated channels.The complementary neural network for image recognition of Fashion-MNIST dataset was constructed using the matched relative amplitude and plasticity properties of the GFST dominated by holes or electrons to improve the weight regulation and recognition accuracy,achieving a pattern recognition accuracy of 83.23%.These results provide new insights to the construction of future neuromorphic systems.展开更多
Optical Kerr effect, in which input light intensity linearly alters the refractive index, has enabled the generation ofoptical solitons, supercontinuum spectra, and frequency combs, playing vital roles in the on-chip ...Optical Kerr effect, in which input light intensity linearly alters the refractive index, has enabled the generation ofoptical solitons, supercontinuum spectra, and frequency combs, playing vital roles in the on-chip devices, fibercommunications, and quantum manipulations. Especially, terahertz Kerr effect, featuring fascinating prospects in futurehigh-rate computing, artificial intelligence, and cloud-based technologies, encounters a great challenge due to therather low power density and feeble Kerr response. Here, we demonstrate a giant terahertz frequency Kerr nonlinearitymediated by stimulated phonon polaritons. Under the influences of the giant Kerr nonlinearity, the power-dependentrefractive index change would result in a frequency shift in the microcavity, which was experimentally demonstratedvia the measurement of the resonant mode of a chip-scale lithium niobate Fabry-Pérot microcavity. Attributed to theexistence of stimulated phonon polaritons, the nonlinear coefficient extracted from the frequency shifts is orders ofmagnitude larger than that of visible and infrared light, which is also theoretically demonstrated by nonlinear Huangequations. This work opens an avenue for many rich and fruitful terahertz Kerr effect based physical, chemical, andbiological systems that have terahertz fingerprints.展开更多
The neutron star as a supernova remnant is attracting high attention recently due to the gravitation wave detection and precise measurements about its mass and radius.In particular,the compact object with a mass of 2....The neutron star as a supernova remnant is attracting high attention recently due to the gravitation wave detection and precise measurements about its mass and radius.In particular,the compact object with a mass of 2.50-2.67 M_(⊙)observed by LIGO Scientific and Virgo collaborations in GW190814,as well as the recent report of a light compact object with a mass and radius of M=0.77_(-0.17)^(+0.20)M_(⊙)and R=10.4_(-0.78)^(+0.86)km within the supernova remnant HESS J1731-347,have posed a great challenge to the investigations into the supranuclear matter.In the inner core of a neutron star,the strangeness degrees of freedom,such as the hyperons,can be present to form a hyperon star.In this work,the neutron star consisting of nucleons and leptons,and the hyperonic star including the hyperons will be studied in the framework of the density-dependent relativistic mean-field(DDRMF)model.Some popular DDRMF parameterizations will be adopted to investigate the properties of nuclear matter and the mass,radius,tidal deformability,and other properties of neutron star and hyperonic stars.We find that the maximum masses of neutron star calculated by DD-MEX,DD-MEX1,DD-MEX2,DD-MEXY and DD-LZ1 sets can be around 2.5-2.6 MM_(⊙)because they can produce quite stiff equations of state(EOSs)due to the strong repulsive contributions from vector potentials at high densities.Moreover,by investigating the influence of the crust EOS and core EOS on the neutron stars,we find that the observational data from HESS J1731-347 suggest the requirement of a crust EOS with a higher L parameter and a core EOS with a lower L parameter,and the M-R relations from the constructed EOSs can also be consistent with the observables of PSR J0740+6620,PSR J0030+0451 from NICER and the GW170817 event.With the inclusion of hyperons,the hyperonic star matter becomes softer compared to the neutron star matter,but the massive hyperonic star can also be obtained with DDRMF parameter sets if the vector meson coupling constants are strong.展开更多
Compact terahertz(THz)devices,especially for nonlinear THz components,have received more and more attention due to their potential applications in THz nonlinearity-based sensing,communications,and computing devices.Ho...Compact terahertz(THz)devices,especially for nonlinear THz components,have received more and more attention due to their potential applications in THz nonlinearity-based sensing,communications,and computing devices.However,effective means to enhance,control,and confine the nonlinear harmonics of THz waves remain a great challenge for micro-scale THz nonlinear devices.In this work,we have established a technique for nonlinear harmonic generation of THz waves based on phonon polariton-enhanced giant THz nonlinearity in a 2D-topologically protected valley photonic microcavity.Effective THz harmonic generation has been observed in both noncentrosymmetric and centrosymmetric nonlinear materials.These results can provide a valuable reference for the generation and control of THz high-harmonics,thus developing new nonlinear devices in the THz regime.展开更多
An artificial withdrawal reflex arc that can realize neuromorphic tactile perception,neural coding,information processing,and real-time responses was fabricated at the device level without dependence on algorithms.As ...An artificial withdrawal reflex arc that can realize neuromorphic tactile perception,neural coding,information processing,and real-time responses was fabricated at the device level without dependence on algorithms.As an extended application,the artificial reflex arc was used to perform an object-lifting task based on tactile commands,and it can easily lift a 200-g weight.A fiber-exploiting electro-optical synaptic transistor(FEST)was fabricated to emulate synaptic plasticity modulated by electrical or optical spikes.Due to an ultrahigh spike duration-dependent plasticity index(~12,651%),the FEST was applied in electro-optical encrypted communication tasks and effectively increased signal recognition accuracy.In addition,the FEST has excellent bending resistance(bending radii=0.6-1.4 cm,bending cycles>2000)and stable illumination responses for a wide range of incident angles(0°-360°),demonstrating its potential applicability in wearable electronics.This work presents new design strategies for complete artificial reflex arcs and wearable neuromorphic devices,which may have applications in bioinspired artificial intelligence,human-machine interaction,and neuroprosthetics.展开更多
Artificial synapses are essential building blocks for neuromorphic electronics.Here,solid polymer electrolyte-gated artificial synapses(EGASs)were fabricated using ITO fibers as channels,which possess an ultra-high se...Artificial synapses are essential building blocks for neuromorphic electronics.Here,solid polymer electrolyte-gated artificial synapses(EGASs)were fabricated using ITO fibers as channels,which possess an ultra-high sensitivity of 5 m V and a long-term memory time exceeding 3 min.Notably,digitally printed ITO-fiber arrays exhibit an ultra-high transmittance of approximately 99.67%.Biological synaptic plasticity,such as excitatory postsynaptic current,paired-pulse facilitation,spike frequency-dependent plasticity,and synaptic potentiation and depression,were successfully mimicked using the EGASs.Based on the synaptic properties of the EGASs,an artificial neural network was constructed to perform supervised learning using the Fashion-MNIST dataset,achieving high pattern recognition rate(82.39%)due to the linear and symmetric synaptic plasticity.This work provides insights into high-sensitivity artificial synapses for future neuromorphic computing.展开更多
The ionic environment of body fluids influences nervous functions for maintaining homeostasis in organisms and ensures normal perceptual abilities and reflex activities.Neural reflex activities,such as limb movements,...The ionic environment of body fluids influences nervous functions for maintaining homeostasis in organisms and ensures normal perceptual abilities and reflex activities.Neural reflex activities,such as limb movements,are closely associated with potassium ions(K+).In this study,we developed artificial synaptic devices based on ion concentration-adjustable gels for emulating various synaptic plasticities under different K+concentrations in body fluids.In addition to performing essential synaptic functions,potential applications in information processing and associative learning using short-and long-term plasticity realized using ion concentration-adjustable gels are presented.Artificial synaptic devices can be used for constructing an artificial neural pathway that controls artificial muscle reflex activities and can be used for image pattern recognition.All tests show a strong relationship with ion homeostasis.These devices could be applied to neuromorphic robots and human-machine interfaces.展开更多
In recent years,a variety of pneumatic soft actuators(PSAs)have been proposed due to the develop-ment of soft robots in biomimetic robots,medical devices,etc.At the same time,the modeling and control of PSAs remains a...In recent years,a variety of pneumatic soft actuators(PSAs)have been proposed due to the develop-ment of soft robots in biomimetic robots,medical devices,etc.At the same time,the modeling and control of PSAs remains an open question.In this paper,a spatial bending pneumatic soft actuator(SBPSA)modeling method based on the Prandtl-Ishlinskii(PI)model is proposed,and the inverse model is designed to compensate for hysteresis nonlinearity.Furthermore,an adaptive feedback controller combined with a hysteresis compensator is proposed for the precise control and tracking of SBPSAs.Finally,an experimental platform is built,and experimental results demonstrate the effectiveness of the proposed method for precise tracking.展开更多
A flexible optoelectronic neural transistor(OENT)that consists of a one‐step spin‐coated tri‐blend film composed of 2,7‐dioctyl[1]benzothieno[3,2‐b][1]benzothiophene(C8‐BTBT),poly(3‐hexylthiophene‐2,5‐diyl)(P...A flexible optoelectronic neural transistor(OENT)that consists of a one‐step spin‐coated tri‐blend film composed of 2,7‐dioctyl[1]benzothieno[3,2‐b][1]benzothiophene(C8‐BTBT),poly(3‐hexylthiophene‐2,5‐diyl)(P3HT),and poly(methyl methacrylate)(PMMA)is demonstrated.The C8‐BTBT and P3HT phases in the film partially segregate into distinct domains,which combine to provide broadband spectrum sensing,and instant electrical‐processing capabilities dominated by C8‐BTBT.The OENT is sensitive to solar radiation from the near‐ultraviolet(NUV)and to visible(Vis)radiation from blue to red.When exposed to NUV radiation,the OENT responds sensitively and retains the memory of the exposure for over 10^(3 )s.The OENT provides a warning of excessive chronic exposure to harmful NUV.These properties allow high‐pass filtering with different cut‐off frequencies fc that can restrict the reception of blue,green,or red.These switchable fc enables sensitive image reconstruction and multitarget monitoring.The device combined with a chitosan gel achieves strictly defined short‐range plasticity of<1 s that can achieve diverse instant‐computing applications such as spatiotemporally correlated coding and logic functions.Stable real‐time signal processing facilitates the realization of a Morse‐code recognition system constructed using neuro‐morphological hardware,achieving highly accurate character recognition.This study provides a useful resource that can have applications in wearable biomedical electronics and multimodal neuromorphic computing.展开更多
In this paper,observer-based control for fractional-order singular systems with orderα(0<α<1)and input delay is studied.On the basis of the Smith predictor and approximation error,the system with input delay i...In this paper,observer-based control for fractional-order singular systems with orderα(0<α<1)and input delay is studied.On the basis of the Smith predictor and approximation error,the system with input delay is approximately equivalent to the system without input delay.Furthermore,based on the linear matrix inequality(LMI)technique,the necessary and sufficient condition of observer-based control is proposed.Since the condition is a nonstrict LMI,including the equality constraint,it will lead to some trouble when solving problems using toolbox.Thus,the strict LMI-based condition is improved in the paper.Finally,a numerical example and a direct current motor example are given to illustrate the effectiveness of the strict LMI-based condition.展开更多
A flexible organic artificial synapse(OAS)for tunable time-frequency signal processing was fabricated using a tri-blend film that had been fabricated using a one-step solution method.When combined with a chitosan film...A flexible organic artificial synapse(OAS)for tunable time-frequency signal processing was fabricated using a tri-blend film that had been fabricated using a one-step solution method.When combined with a chitosan film,this OAS can achieve an ultrashort-term retention time of only 49 ms for instant electricalcomputing applications;this is the shortest retention time yet achieved by a two-terminal artificial synapse.An array of these flexible OASs can withstand a high bending strain of 5%for 10^(4) cycles;this deformation endurance is a new record.The OAS was also sensitive to the number and frequency of electrical inputs;a tunable cut-off frequency enables dynamic filtering for use in image detail enhancement.This work provides a new resource for development of future neuromorphic computing devices。展开更多
Optoelectronic artificial synapses(OEASs)are essential for realizing artificial neural networks(ANNs)in nextgeneration information processing that has high transmission speed,high bandwidth,and low power consumption.T...Optoelectronic artificial synapses(OEASs)are essential for realizing artificial neural networks(ANNs)in nextgeneration information processing that has high transmission speed,high bandwidth,and low power consumption.Two-dimensional(2D)materials endowed with strong light-matter interactions and atomically thin dangling-bond-free surfaces are candidates for achieving versatile optoelectronics.Developing 2D OEASs for future neuromorphic applications is significant to break the bottleneck of von Neumann architecture and achieve future artificial intelligence systems.This review primarily focuses on recent developments in advanced 2D OEASs,discussing their working mechanism as well as potential applications.Common materials,device structures,and their synthesis and construction methods are also summarized.Finally,the prospects for future 2D OEASs from the perspectives of materials,performance,and applications are briefly described.展开更多
基金This work was supported by the Guangdong Major Project of Basic and Applied Basic Research(2020B0301030009)the National Key Research and Development Program of China(2022YFC3400600)National Natural Science Foundation of China(12174208,32227802,11874231,31801134 and 31870843)+2 种基金Tianjin Natural Science Foundation(20JCYBJC01010)China Postdoctoral Science Foundation(2020M680032)Fundamental Research Funds for the Central Universities(2122021337 and 2122021405).
文摘Actin cytoskeleton plays crucial roles in various cellular functions.Extracellular matrix(ECM)can modulate cell morphology by remodeling the internal cytoskeleton.To define how geometry of ECM regulates the organization of actin cytoskeleton,we plated individual NIH 3T3 cells on micropatterned substrates with distinct shapes and sizes.It was found that the stress fibers could form along the nonadhesive edges of T-shaped pattern,but were absent from the opening edge of V-shaped pattern,indicating that the organization of actin cytoskeleton was dependent on the mechanical environment.Furthermore,a secondary actin ring was observed on 50μm circular pattern while did not appear on 30μm and 40μm pattern,showing a size-dependent organization of actin cytoskeleton.Finally,osteoblasts,MDCK and A549 cells exhibited distinct organization of actin cytoskeleton on T-shaped pattern,suggesting a cell-type specificity in arrangement of actin cytoskeleton.Together,our findings brought novel insight into the organization of actin cytoskeleton on micropatterned environments.
基金supported by the National Natural Science Foundation of China(Nos.12174208,32227802)National Key Research and Development Program of China(No.2022YFC3400600)+3 种基金Guangdong Major Project of Basic and Applied Basic Research(No.2020B0301030009)China Postdoctoral Science Foundation(No.2020 M680032)Fundamental Research Funds for the Central Universities(Nos.2122021337,2122021405)the 111 Project(No.B23045).
文摘Cells are highly sensitive to their geometrical and mechanical microenvironment that directly regulate cell shape,cytoskeleton and organelle,as well as the nucleus morphology and genetic expression.The emerging two-dimensional micropatterning techniques offer powerful tools to construct controllable and well-organized microenvironment for single-cell level investigations with qualitative analysis,cellular standardization,and in vivo environment mimicking.Here,we provide an overview of the basic principle and characteristics of the two most widely-used micropatterning techniques,including photolithographic micropatterning and soft lithography micropatterning.Moreover,we summarize the application of micropatterning technique in controlling cytoskeleton,cell migration,nucleus and gene expression,as well as intercellular communication.
基金the financial support of National Key Research and Development Program of China(Grant No.2023YFB4202503)the Joint Funds of the National Natural Science Foundation of China(Grant No.U21A2072)+7 种基金Natural Science Foundation of China(Grant No.62274099)Natural Science Foundation of Tianjin(No.20JCQNJC02070)China Postdoctoral Science Foundation(No.2020T130317)the Overseas Expertise Introduction Project for Discipline Innovation of Higher Education of China(Grant No.B16027)Tianjin Science and Technology Project(Grant No.18ZXJMTG00220)Key R&D Program of Hebei Province(No.19214301D)provided by the Haihe Laboratory of Sustainable Chemical Transformationsthe Fundamental Research Funds for the Central Universities,Nankai University.
文摘Monolithic textured perovskite/silicon tandem solar cells(TSCs)are expected to achieve maximum light capture at the lowest cost,potentially exhibiting the best power conversion efficiency.However,it is challenging to fabricate high-quality perovskite films and preferred crystal orientation on commercially textured silicon substrates with micrometersize pyramids.Here,we introduced a bulky organic molecule(4-fluorobenzylamine hydroiodide(F-PMAI))as a perovskite additive.It is found that F-PMAI can retard the crystallization process of perovskite film through hydrogen bond interaction between F^(−)and FA^(+)and reduce(111)facet surface energy due to enhanced adsorption energy of F-PMAI on the(111)facet.Besides,the bulky molecular is extruded to the bottom and top of perovskite film after crystal growth,which can passivate interface defects through strong interaction between F-PMA+and undercoordinated Pb^(2+)/I^(−).As a result,the additive facilitates the formation of large perovskite grains and(111)preferred orientation with a reduced trap-state density,thereby promoting charge carrier transportation,and enhancing device performance and stability.The perovskite/silicon TSCs achieved a champion efficiency of 30.05%based on a silicon thin film tunneling junction.In addition,the devices exhibit excellent longterm thermal and light stability without encapsulation.This work provides an effective strategy for achieving efficient and stable TSCs.
基金supported by the Shenzhen Science and Technology Program(No.JCYJ20210324121002008)the National Science Fund for Distinguished Young Scholars of China(No.T2125005)+5 种基金the National Key R&D Program of China(Nos.2022YFE0198200,2022YFA1204500,and 2022YFA1204504)the Natural Science Foundation of Tianjin(Nos.22JCYBJC01290 and 23JCQNJC01440)the Key Project of Natural Science Foundation of Tianjin(No.22JCZDJC00120)the Fundamental Research Funds for the Central Universities,Nankai University(Nos.BEG124901 and BEG124401)the Guangdong Basic and Applied Basic Research Foundation(No.2023A1515110319)the Key Science and Technology Program of Henan Province(No.242102210171).
文摘We demonstrate a bipolar graphene/F_(16)CuPc synaptic transistor(GFST)with matched p-type and n-type bipolar properties,which emulates multiplexed neurotransmission of the release of two excitatory neurotransmitters in graphene and F_(16)CuPc channels,separately.This process facilitates fast-switching plasticity by altering charge carriers in the separated channels.The complementary neural network for image recognition of Fashion-MNIST dataset was constructed using the matched relative amplitude and plasticity properties of the GFST dominated by holes or electrons to improve the weight regulation and recognition accuracy,achieving a pattern recognition accuracy of 83.23%.These results provide new insights to the construction of future neuromorphic systems.
基金jointly supported by the National Key Research and Development Program of China(2018YFB1304905)the National Natural Science Foundation of China(NSFC)(62027812,U1813210,62003174,and 61903201)China Postdoctoral Science Foundation(2020M680865)。
基金supported by the National Natural Science Foundation of China(62205158 and 11974192)the Foundation of State Key Laboratory of laser Interaction with Matter(SKLLIM2101)the 111 Project(B23045).
文摘Optical Kerr effect, in which input light intensity linearly alters the refractive index, has enabled the generation ofoptical solitons, supercontinuum spectra, and frequency combs, playing vital roles in the on-chip devices, fibercommunications, and quantum manipulations. Especially, terahertz Kerr effect, featuring fascinating prospects in futurehigh-rate computing, artificial intelligence, and cloud-based technologies, encounters a great challenge due to therather low power density and feeble Kerr response. Here, we demonstrate a giant terahertz frequency Kerr nonlinearitymediated by stimulated phonon polaritons. Under the influences of the giant Kerr nonlinearity, the power-dependentrefractive index change would result in a frequency shift in the microcavity, which was experimentally demonstratedvia the measurement of the resonant mode of a chip-scale lithium niobate Fabry-Pérot microcavity. Attributed to theexistence of stimulated phonon polaritons, the nonlinear coefficient extracted from the frequency shifts is orders ofmagnitude larger than that of visible and infrared light, which is also theoretically demonstrated by nonlinear Huangequations. This work opens an avenue for many rich and fruitful terahertz Kerr effect based physical, chemical, andbiological systems that have terahertz fingerprints.
文摘The neutron star as a supernova remnant is attracting high attention recently due to the gravitation wave detection and precise measurements about its mass and radius.In particular,the compact object with a mass of 2.50-2.67 M_(⊙)observed by LIGO Scientific and Virgo collaborations in GW190814,as well as the recent report of a light compact object with a mass and radius of M=0.77_(-0.17)^(+0.20)M_(⊙)and R=10.4_(-0.78)^(+0.86)km within the supernova remnant HESS J1731-347,have posed a great challenge to the investigations into the supranuclear matter.In the inner core of a neutron star,the strangeness degrees of freedom,such as the hyperons,can be present to form a hyperon star.In this work,the neutron star consisting of nucleons and leptons,and the hyperonic star including the hyperons will be studied in the framework of the density-dependent relativistic mean-field(DDRMF)model.Some popular DDRMF parameterizations will be adopted to investigate the properties of nuclear matter and the mass,radius,tidal deformability,and other properties of neutron star and hyperonic stars.We find that the maximum masses of neutron star calculated by DD-MEX,DD-MEX1,DD-MEX2,DD-MEXY and DD-LZ1 sets can be around 2.5-2.6 MM_(⊙)because they can produce quite stiff equations of state(EOSs)due to the strong repulsive contributions from vector potentials at high densities.Moreover,by investigating the influence of the crust EOS and core EOS on the neutron stars,we find that the observational data from HESS J1731-347 suggest the requirement of a crust EOS with a higher L parameter and a core EOS with a lower L parameter,and the M-R relations from the constructed EOSs can also be consistent with the observables of PSR J0740+6620,PSR J0030+0451 from NICER and the GW170817 event.With the inclusion of hyperons,the hyperonic star matter becomes softer compared to the neutron star matter,but the massive hyperonic star can also be obtained with DDRMF parameter sets if the vector meson coupling constants are strong.
基金supported by the National Natural Science Foundation of China(Nos.62205158 and 11874229)the China Postdoctoral Science Foundation(No.2022M711709)+2 种基金the Foundation of State Key Laboratory of Laser Interaction with Matter(No.SKLLIM2101)the 111 Project(No.B23045)the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT_13R29).
文摘Compact terahertz(THz)devices,especially for nonlinear THz components,have received more and more attention due to their potential applications in THz nonlinearity-based sensing,communications,and computing devices.However,effective means to enhance,control,and confine the nonlinear harmonics of THz waves remain a great challenge for micro-scale THz nonlinear devices.In this work,we have established a technique for nonlinear harmonic generation of THz waves based on phonon polariton-enhanced giant THz nonlinearity in a 2D-topologically protected valley photonic microcavity.Effective THz harmonic generation has been observed in both noncentrosymmetric and centrosymmetric nonlinear materials.These results can provide a valuable reference for the generation and control of THz high-harmonics,thus developing new nonlinear devices in the THz regime.
基金supported by the National Science Fund for Distinguished Young Scholars of China(T2125005)the National Key R&D Program of China(2022YFE0198200,2022YFA1204500,and 2022YFA1204504)+3 种基金the Tianjin Science Foundation for Distinguished Young Scholars(19JCJQJC61000)the Shenzhen Science and Technology Project(JCYJ20210324121002008)the National Natural Science Foundation of China(62204131)the China Postdoctoral Science Foundation(2023T160336).
文摘An artificial withdrawal reflex arc that can realize neuromorphic tactile perception,neural coding,information processing,and real-time responses was fabricated at the device level without dependence on algorithms.As an extended application,the artificial reflex arc was used to perform an object-lifting task based on tactile commands,and it can easily lift a 200-g weight.A fiber-exploiting electro-optical synaptic transistor(FEST)was fabricated to emulate synaptic plasticity modulated by electrical or optical spikes.Due to an ultrahigh spike duration-dependent plasticity index(~12,651%),the FEST was applied in electro-optical encrypted communication tasks and effectively increased signal recognition accuracy.In addition,the FEST has excellent bending resistance(bending radii=0.6-1.4 cm,bending cycles>2000)and stable illumination responses for a wide range of incident angles(0°-360°),demonstrating its potential applicability in wearable electronics.This work presents new design strategies for complete artificial reflex arcs and wearable neuromorphic devices,which may have applications in bioinspired artificial intelligence,human-machine interaction,and neuroprosthetics.
基金supported by the National Science Fund for Distinguished Young Scholars of China(No.T2125005)the National Key R&D Program of China(Nos.2022YFE0198200,2022YFA1204500,2022YFA1204504)+3 种基金the Shenzhen Science and Technology Project(No.JCYJ20210324121002008)the Natural Science Foundation of Tianjin(Nos.22JCYBJC01290,23JCQNJC01440)the Key Project of Nature Science Foundation of Tianjin(No.22JCZDJC00120)the Fundamental Research Funds for the Central Universities,Nankai University(Nos.BEG124901,BEG124401)。
文摘Artificial synapses are essential building blocks for neuromorphic electronics.Here,solid polymer electrolyte-gated artificial synapses(EGASs)were fabricated using ITO fibers as channels,which possess an ultra-high sensitivity of 5 m V and a long-term memory time exceeding 3 min.Notably,digitally printed ITO-fiber arrays exhibit an ultra-high transmittance of approximately 99.67%.Biological synaptic plasticity,such as excitatory postsynaptic current,paired-pulse facilitation,spike frequency-dependent plasticity,and synaptic potentiation and depression,were successfully mimicked using the EGASs.Based on the synaptic properties of the EGASs,an artificial neural network was constructed to perform supervised learning using the Fashion-MNIST dataset,achieving high pattern recognition rate(82.39%)due to the linear and symmetric synaptic plasticity.This work provides insights into high-sensitivity artificial synapses for future neuromorphic computing.
基金supported by the National Science Foundation for Distinguished Young Scholars of China(T2125005)Tianjin Science Foundation for Distinguished Young Scholars(19JCJQJC61000)the Shenzhen Science and Technology Project(JCYJ20210324121002008).
文摘The ionic environment of body fluids influences nervous functions for maintaining homeostasis in organisms and ensures normal perceptual abilities and reflex activities.Neural reflex activities,such as limb movements,are closely associated with potassium ions(K+).In this study,we developed artificial synaptic devices based on ion concentration-adjustable gels for emulating various synaptic plasticities under different K+concentrations in body fluids.In addition to performing essential synaptic functions,potential applications in information processing and associative learning using short-and long-term plasticity realized using ion concentration-adjustable gels are presented.Artificial synaptic devices can be used for constructing an artificial neural pathway that controls artificial muscle reflex activities and can be used for image pattern recognition.All tests show a strong relationship with ion homeostasis.These devices could be applied to neuromorphic robots and human-machine interfaces.
基金supported in part by the National Natural Science Foundation of China(52205019 and 62373198)in part by the Fundamental Research Funds for the Central Universities(078-63243157).
文摘In recent years,a variety of pneumatic soft actuators(PSAs)have been proposed due to the develop-ment of soft robots in biomimetic robots,medical devices,etc.At the same time,the modeling and control of PSAs remains an open question.In this paper,a spatial bending pneumatic soft actuator(SBPSA)modeling method based on the Prandtl-Ishlinskii(PI)model is proposed,and the inverse model is designed to compensate for hysteresis nonlinearity.Furthermore,an adaptive feedback controller combined with a hysteresis compensator is proposed for the precise control and tracking of SBPSAs.Finally,an experimental platform is built,and experimental results demonstrate the effectiveness of the proposed method for precise tracking.
基金supported by the National Science Fund for Distinguished Young Scholars of China(No.T2125005)the Tianjin Science Foundation for Distinguished Young Scholars(No.19JCJQJC61000)+1 种基金the Shenzhen Science and Technology Project(No.JCYJ20210324121002008)the Inter‐Governmental International Scientific and Technological Innovation Cooperation Key Projects(No.SQ2021YFE011099).
文摘A flexible optoelectronic neural transistor(OENT)that consists of a one‐step spin‐coated tri‐blend film composed of 2,7‐dioctyl[1]benzothieno[3,2‐b][1]benzothiophene(C8‐BTBT),poly(3‐hexylthiophene‐2,5‐diyl)(P3HT),and poly(methyl methacrylate)(PMMA)is demonstrated.The C8‐BTBT and P3HT phases in the film partially segregate into distinct domains,which combine to provide broadband spectrum sensing,and instant electrical‐processing capabilities dominated by C8‐BTBT.The OENT is sensitive to solar radiation from the near‐ultraviolet(NUV)and to visible(Vis)radiation from blue to red.When exposed to NUV radiation,the OENT responds sensitively and retains the memory of the exposure for over 10^(3 )s.The OENT provides a warning of excessive chronic exposure to harmful NUV.These properties allow high‐pass filtering with different cut‐off frequencies fc that can restrict the reception of blue,green,or red.These switchable fc enables sensitive image reconstruction and multitarget monitoring.The device combined with a chitosan gel achieves strictly defined short‐range plasticity of<1 s that can achieve diverse instant‐computing applications such as spatiotemporally correlated coding and logic functions.Stable real‐time signal processing facilitates the realization of a Morse‐code recognition system constructed using neuro‐morphological hardware,achieving highly accurate character recognition.This study provides a useful resource that can have applications in wearable biomedical electronics and multimodal neuromorphic computing.
基金Project supported by the National Natural Science Foundation of China(Nos.U1813210,62027812,and 62273185)。
文摘In this paper,observer-based control for fractional-order singular systems with orderα(0<α<1)and input delay is studied.On the basis of the Smith predictor and approximation error,the system with input delay is approximately equivalent to the system without input delay.Furthermore,based on the linear matrix inequality(LMI)technique,the necessary and sufficient condition of observer-based control is proposed.Since the condition is a nonstrict LMI,including the equality constraint,it will lead to some trouble when solving problems using toolbox.Thus,the strict LMI-based condition is improved in the paper.Finally,a numerical example and a direct current motor example are given to illustrate the effectiveness of the strict LMI-based condition.
基金supported by the National Key R&D Program of China(Nos.2022YFE0198200,2022YFA1200044)the National Science Fund for Distinguished Young Scholars of China(No.T2125005)+1 种基金the Tianjin Science Foundation for Distinguished Young Scholars(No.19JCJQJC61000)the Shenzhen Science and Technology Project(No.JCYj20210324121002008).
文摘A flexible organic artificial synapse(OAS)for tunable time-frequency signal processing was fabricated using a tri-blend film that had been fabricated using a one-step solution method.When combined with a chitosan film,this OAS can achieve an ultrashort-term retention time of only 49 ms for instant electricalcomputing applications;this is the shortest retention time yet achieved by a two-terminal artificial synapse.An array of these flexible OASs can withstand a high bending strain of 5%for 10^(4) cycles;this deformation endurance is a new record.The OAS was also sensitive to the number and frequency of electrical inputs;a tunable cut-off frequency enables dynamic filtering for use in image detail enhancement.This work provides a new resource for development of future neuromorphic computing devices。
基金supported by The National Science Fund for Distinguished Young Scholars of China (T2125005)The National Key R&D Program of China (2022YFE0198200,2022YFA1204500,2022YFA1204504)+1 种基金Tianjin Science Foundation for Distinguished Young Scholars (19JCJQJC61000)The Shenzhen Science and Technology Project (JCYJ20210324121002008).
文摘Optoelectronic artificial synapses(OEASs)are essential for realizing artificial neural networks(ANNs)in nextgeneration information processing that has high transmission speed,high bandwidth,and low power consumption.Two-dimensional(2D)materials endowed with strong light-matter interactions and atomically thin dangling-bond-free surfaces are candidates for achieving versatile optoelectronics.Developing 2D OEASs for future neuromorphic applications is significant to break the bottleneck of von Neumann architecture and achieve future artificial intelligence systems.This review primarily focuses on recent developments in advanced 2D OEASs,discussing their working mechanism as well as potential applications.Common materials,device structures,and their synthesis and construction methods are also summarized.Finally,the prospects for future 2D OEASs from the perspectives of materials,performance,and applications are briefly described.
