Digital twins and the physical assets of electric power systems face the potential risk of data loss and monitoring failures owing to catastrophic events,causing surveillance and energy loss.This study aims to refine ...Digital twins and the physical assets of electric power systems face the potential risk of data loss and monitoring failures owing to catastrophic events,causing surveillance and energy loss.This study aims to refine maintenance strategies for the monitoring of an electric power digital twin system post disasters.Initially,the research delineates the physical electric power system along with its digital counterpart and post-disaster restoration processes.Subsequently,it delves into communication and data processing mechanisms,specifically focusing on central data processing(CDP),communication routers(CRs),and phasor measurement units(PMUs),to re-establish an equipment recovery model based on these data transmission methodologies.Furthermore,it introduces a mathematical optimization model designed to enhance the digital twin system’s post-disaster monitoring efficacy by employing the branch-and-bound method for its resolution.The efficacy of the proposed model was corroborated by analyzing an IEEE-14 system.The findings suggest that the proposed branch-and-bound algorithm significantly augments the observational capabilities of a power system with limited resources,thereby bolstering its stability and emergency response mechanisms.展开更多
Grapevine is one of the most economically important crops worldwide.However,the previous versions of the grapevine reference genome tipically consist of thousands of fragments with missing centromeres and telomeres,li...Grapevine is one of the most economically important crops worldwide.However,the previous versions of the grapevine reference genome tipically consist of thousands of fragments with missing centromeres and telomeres,limiting the accessibility of the repetitive sequences,the centromeric and telomeric regions,and the study of inheritance of important agronomic traits in these regions.Here,we assembled a telomere-to-telomere(T2T)gap-free reference genome for the cultivar PN40024 using PacBio HiFi long reads.The T2T reference genome(PN_T2T)is 69 Mb longer with 9018 more genes identified than the 12X.v0 version.We annotated 67%repetitive sequences,19 centromeres and 36 telomeres,and incorporated gene annotations of previous versions into the PN_T2T assembly.We detected a total of 377 gene clusters,which showed associations with complex traits,such as aroma and disease resistance.Even though PN40024 derives from nine generations of selfing,we still found nine genomic hotspots of heterozygous sites associated with biological processes,such as the oxidation–reduction process and protein phosphorylation.The fully annotated complete reference genome therefore constitutes an important resource for grapevine genetic studies and breeding programs.展开更多
Currently,light-transmitting,energy-saving,and electromagnetic shielding materials are essential for reducing indoor energy consumption and improving the electromagnetic environment.Here,we developed a cellulose compo...Currently,light-transmitting,energy-saving,and electromagnetic shielding materials are essential for reducing indoor energy consumption and improving the electromagnetic environment.Here,we developed a cellulose composite with excellent optical transmittance that retained the natural shape and fiber structure of bamboo.The modified whole bamboo possessed an impressive optical transmittance of approximately 60%at 6.23 mm,illuminance of 1000 luminance(lux),water absorption stability(mass change rate less than 4%),longitudinal tensile strength(46.40 MPa),and surface properties(80.2 HD).These were attributed to not only the retention of the natural circular hollow structure of the bamboo rod on the macro,but also the complete bamboo fiber skeleton template impregnated with UV resin on the micro.Moreover,a multilayered device consisting of translucent whole bamboo,transparent bamboo sheets,and electromagnetic shielding film exhibited remarkable heat insulation and heat preservation performance as well as an electromagnetic shielding performance of 46.3 dB.The impressive optical transmittance,mechanical properties,thermal performance,and electromagnetic shielding abilities combined with the renewable and sustainable nature,as well as the fast and efficient manufacturing process,make this bamboo composite material suitable for effective application in transparent,energy-saving,and electromagnetic shielding buildings.展开更多
The highly integrated and miniaturized next-generation electronic products call for high-performance electromagnetic interference(EMI)shielding materials to assure the normal operation of their closely assembled compo...The highly integrated and miniaturized next-generation electronic products call for high-performance electromagnetic interference(EMI)shielding materials to assure the normal operation of their closely assembled components.However,the most current techniques are not adequate for the fabrication of shielding materials with programmable structure and controllable shielding efficiency.Herein,we demonstrate the direct ink writing of robust and highly conductive Ti3C2Tx MXene frames with customizable structures by using MXene/AlOOH inks for tunable EMI shielding and electromagnetic wave-induced thermochromism applications.The as-printed frames are reinforced by immersing in AlCl_(3)/HCl solution to remove the electrically insulating AlOOH nanoparticles,as well as cross-link the MXene sheets and fuse the filament interfaces with aluminum ions.After freeze-drying,the resultant robust and porous MXene frames exhibit tunable EMI shielding efficiencies in the range of 25-80 dB with the highest electrical conductivity of 5323 S m−1.Furthermore,an electromagnetic wave-induced thermochromic MXene pattern is assembled by coating and curing with thermochromic polydimethylsiloxane on a printed MXene pattern,and its color can be changed from blue to red under the high-intensity electromagnetic irradiation.This work demonstrates a direct ink printing of customizable EMI frames and patterns for tuning EMI shielding efficiency and visualizing electromagnetic waves.展开更多
In this paper, we develop a decentralized algorithm to coord inate a group of mobile robots to search for unknown and transient radio sources. In addition to limited mobility and ranges of communication and sensing, t...In this paper, we develop a decentralized algorithm to coord inate a group of mobile robots to search for unknown and transient radio sources. In addition to limited mobility and ranges of communication and sensing, the robot team has to deal with challenges from signal source anonymity, short transmission duration, and variable transmission power. We propose a two-step approach: First, we decentralize belief functions that robots use to track source locations using checkpoint-based synchronization, and second, we propose a decentralized planning strategy to coordinate robots to ensure the existence of checkpoints. We analyze memory usage, data amount in communication, and searching time for the proposed algorithm. We have implemented the proposed algorithm and compared it with two heuristics. The experimental results show that our algorithm successfully trades a modest amount of memory for the fastest searching time among the three methods.展开更多
Multiplexing technologies based on superconducting quantum interference devices(SQUIDs) are crucial to cryogenic readout of superconducting transition-edge sensor(TES) arrays. Demands for large-scale TES arrays promot...Multiplexing technologies based on superconducting quantum interference devices(SQUIDs) are crucial to cryogenic readout of superconducting transition-edge sensor(TES) arrays. Demands for large-scale TES arrays promote the development of multiplexing technologies towards large multiplexing factors and low readout noise. The development of multiplexing technologies also facilitates new applications of TES arrays in a wide range of frequencies. Here we summarize different types of SQUID-based multiplexing technologies including time-division multiplexing, code-division multiplexing, frequency-division multiplexing and microwave SQUID multiplexing. The advances and parameter constraints of each multiplexing technology are also discussed.展开更多
We investigate gate-regulated transition temperatures for electron hopping behaviours through discrete ionized dopant atoms in silicon junctionless nanowire transistors.We demonstrate that the localization length of t...We investigate gate-regulated transition temperatures for electron hopping behaviours through discrete ionized dopant atoms in silicon junctionless nanowire transistors.We demonstrate that the localization length of the wave function in the spatial distribution is able to be manipulated by the gate electric field.The transition temperatures regulated as the function of the localization length and the density of states near the Fermi energy level allow us to understand the electron hopping behaviours under the influence of thermal activation energy and Coulomb interaction energy.This is useful for future quantum information processing by single dopant atoms in silicon.展开更多
The cellulose nanocrystals/graphene composite aerogel(CGA)and polyvinyl alcohol/cellulose nanocrystals/graphene composite aerogel(PCGA)were prepared by suspension titration,tert-butanol solution replacement and freeze...The cellulose nanocrystals/graphene composite aerogel(CGA)and polyvinyl alcohol/cellulose nanocrystals/graphene composite aerogel(PCGA)were prepared by suspension titration,tert-butanol solution replacement and freeze-drying successively.The removal rates of methyl blue(MB)from water by CGA and PCGA were evaluated and the effects of additions,adsorption time,reaction temperature and pH value of CGA and PCGA on MB removal rate were discussed.It was found that the optimal concentrations of both CGA and PCGA were 2 g∙L-1 in the adsorption reaction process and the adsorption equilibrium was reached within 120 min.The higher the initial pH value of MB solution is,the better the removal effect will be.The adsorption kinetics conformed to the pseudo-second-order kinetic model.The langmuir isothermal adsorption equation showed the maximum adsorption capacities of CGA and PCGA were 125 mg∙g-1 and 110.9 mg∙g-1,respectively.Under the conditions of adsorption time of 120 min,reaction temperature of 323 K,and initial MB solution pH value of 11,both CGA and PCGA had higher removal rates of MB,reaching more than 98%.展开更多
Metaheuristic algorithm is a generalization of heuristic algorithm that can be applied to almost all optimization problems.For optimization problems,metaheuristic algorithm is one of the methods to find its optimal so...Metaheuristic algorithm is a generalization of heuristic algorithm that can be applied to almost all optimization problems.For optimization problems,metaheuristic algorithm is one of the methods to find its optimal solution or approximate solution under limited conditions.Most of the existing metaheuristic algorithms are designed for serial systems.Meanwhile,existing algorithms still have a lot of room for improvement in convergence speed,robustness,and performance.To address these issues,this paper proposes an easily parallelizable metaheuristic optimization algorithm called team competition and cooperation optimization(TCCO)inspired by the process of human team cooperation and competition.The proposed algorithm attempts to mathematically model human team cooperation and competition to promote the optimization process and find an approximate solution as close as possible to the optimal solution under limited conditions.In order to evaluate the performance of the proposed algorithm,this paper compares the solution accuracy and convergence speed of the TCCO algorithm with the Grasshopper Optimization Algorithm(GOA),Seagull Optimization Algorithm(SOA),Whale Optimization Algorithm(WOA)and Sparrow Search Algorithm(SSA).Experiment results of 30 test functions commonly used in the optimization field indicate that,compared with these current advanced metaheuristic algorithms,TCCO has strong competitiveness in both solution accuracy and convergence speed.展开更多
Although MXene sheets possess high electrical conductivity and rich surface chemistry and are well suit-able for fabricating electrically conductive nanocomposites for electromagnetic interference(EMI)shield-ing appli...Although MXene sheets possess high electrical conductivity and rich surface chemistry and are well suit-able for fabricating electrically conductive nanocomposites for electromagnetic interference(EMI)shield-ing applications,it remains challenging for MXene nanocomposites to achieve tunable EMI shielding per-formances and customized geometries.Herein,an aqueous MXene/sodium alginate ink is developed to print aerogel meshes with customized geometries using a direct ink writing approach.An ion-enhanced strategy is proposed to reinforce the printed aerogel meshes by multi-level cross-linking.The resultant 3D printed aerogel mesh exhibits an ultrahigh electrical conductivity of 2.85×10^(3)S m^(−1),outstanding mechanical properties,and excellent structural stability in wet environment.More importantly,a wide range of tunable EMI shielding efficiencies from 45 to 100 dB is achieved by the structural design of the 3D printed ion-enhanced MXene/sodium alginate aerogel meshes.As a Joule heater,in addition,the printed aerogel meshes can achieve a wide temperature range of 40-135℃at low driving voltages.This work demonstrates a direct ink writing approach for the fabrication of ion-enhanced MXene/sodium al-ginate aerogel meshes with tunable EMI shielding properties and multi-functionalities for applications in many scenarios.展开更多
Dear Editor,Base editors can achieve targeted C-to-T and A-to-G conversion without the generation of DNA double-strand breaks(DSBs)or the requirement of a donor template,showing the potential to generate new mutations...Dear Editor,Base editors can achieve targeted C-to-T and A-to-G conversion without the generation of DNA double-strand breaks(DSBs)or the requirement of a donor template,showing the potential to generate new mutations or to correct pathogenic mutations(Gaudelli et al.,2018).However,for conventional base editors,efficient base editing requires the presence of an NGG protospacer adjacent motif(PAM)that lies 12–16 nt downstream of the target bases,which generally limits the application of these base editors(Gaudelli et al.,2018).展开更多
Non-exosomal non-coding RNAs(non-exo-ncRNAs)and exosomal ncRNAs(exo-ncRNAs)have been associated with the pathological development of myocardial infarction(MI).Accordingly,this analytical review provides an overview of...Non-exosomal non-coding RNAs(non-exo-ncRNAs)and exosomal ncRNAs(exo-ncRNAs)have been associated with the pathological development of myocardial infarction(MI).Accordingly,this analytical review provides an overview of current MI studies on the role of plasma non-exo/exo-ncRNAs.We summarize the features and crucial roles of ncRNAs and reveal their novel biological correlations via bioinformatics analysis.The following contributions are made:(1)we comprehensively describe the expression profile,competing endogenous RNA(ceRNA)network,and“pre-necrotic”biomarkers of non-exo/exo-ncRNAs for MI;(2)functional enrichment analysis indicates that the target genes of ncRNAs are enriched in the regulation of apoptotic signaling pathway and cellular response to chemical stress,etc.;(3)we propose an updated and comprehensive view on the mechanisms,pathophysiology,and biomarker roles of non-exo/exo-ncRNAs in MI,thereby providing a theoretical basis for the clinical management of MI.展开更多
Wearable devices have a long history,even though wearable robots as emerging area is relatively new.An early report of wearable device can be found in the book Tian Gong Kai Wu(天工开物),published in 1637 where an anc...Wearable devices have a long history,even though wearable robots as emerging area is relatively new.An early report of wearable device can be found in the book Tian Gong Kai Wu(天工开物),published in 1637 where an ancient mechanism that was mounted on human body for cotton fluffing was documented.This type of wearable cotton fluffing tool can still be found in rural areas of China today.展开更多
Untethered microrobots have attracted extensive attention due to their potential for biomedical applications and micromanipulation at the small scale.Soft microrobots are of great research importance because of their ...Untethered microrobots have attracted extensive attention due to their potential for biomedical applications and micromanipulation at the small scale.Soft microrobots are of great research importance because of their highly deformable ability to achieve not only multiple locomotion mechanisms but also minimal invasion to the environment.However,the existing microrobots are still limited in their ability to locomote and cross obstacles in unstructured environments compared to conventional legged robots.Nature provides much inspiration for developing miniature robots.Here,we propose a bionic quadruped soft thin-film microrobot with a nonmagnetic soft body and 4 magnetic flexible legs.The quadruped soft microrobot can achieve multiple controllable locomotion modes in the external magnetic field.The experiment demonstrated the robot’s excellent obstacle-crossing ability by walking on the surface with steps and moving in the bottom of a stomach model with gullies.In particular,by controlling the conical angle of the external conical magnetic field,microbeads gripping,transportation,and release of the microrobot were demonstrated.In the future,the quadruped microrobot with excellent obstacle-crossing and gripping capabilities will be relevant for biomedical applications and micromanipulation.展开更多
Lane changing assistance in autonomous vehicles is a popular research topic. Scene modeling of the driving area is a prerequisite for lane changing decision problems. A road environment representation method based on ...Lane changing assistance in autonomous vehicles is a popular research topic. Scene modeling of the driving area is a prerequisite for lane changing decision problems. A road environment representation method based on a dynamic occupancy grid is proposed in this study. The model encapsulates the data such as vehicle speed, obstacles, lane lines, and traffic rules into a form of spatial drivability probability. This information is compiled into a hash table, and the grid map is mapped into a hash map by means of hash function. A vehicle behavior decision cost equation is established with the model to help drivers make accurate vehicle lane changing decisions based on the principle of least cost, while considering influencing factors such as vehicle drivability, safety, and power. The feasibility of the lane changing assistance strategy is verified through vehicle tests, and the results show that the lane changing assistance system based on a probabilistic model of dynamic occupancy grids can provide lane changing assistance to drivers taking into consideration the dynamics and safety.展开更多
In situ scanning electron microscope(SEM)characterization have enabled the stretching,compression,and bending of micro/nanomaterials and have greatly expanded our understanding of small-scale phenomena.However,as one ...In situ scanning electron microscope(SEM)characterization have enabled the stretching,compression,and bending of micro/nanomaterials and have greatly expanded our understanding of small-scale phenomena.However,as one of the fundamental approaches for material analytics,torsion tests at a small scale remain a major challenge due to the lack of an ultrahigh precise torque sensor and the delicate sample assembly strategy.Herein,we present a microelectromechanical resonant torque sensor with an ultrahigh resolution of up to 4.78 fN∙m within an ultrawide dynamic range of 123 dB.Moreover,we propose a nanorobotic system to realize the precise assembly of microscale specimens with nanoscale positioning accuracy and to conduct repeatable in situ pure torsion tests for the first time.As a demonstration,we characterized the mechanical properties of Si microbeams through torsion tests and found that these microbeams were five-fold stronger than their bulk counterparts.The proposed torsion characterization system pushes the limit of mechanical torsion tests,overcomes the deficiencies in current in situ characterization techniques,and expands our knowledge regarding the behavior of micro/nanomaterials at various loads,which is expected to have significant implications for the eventual development and implementation of materials science.展开更多
基金supported by the State Grid Jilin Province Electric Power Co,Ltd-Research and Application of Power Grid Resilience Assessment and Coordinated Emergency Technology of Supply and Network for the Development of New Power System in Alpine Region(Project Number is B32342210001).
文摘Digital twins and the physical assets of electric power systems face the potential risk of data loss and monitoring failures owing to catastrophic events,causing surveillance and energy loss.This study aims to refine maintenance strategies for the monitoring of an electric power digital twin system post disasters.Initially,the research delineates the physical electric power system along with its digital counterpart and post-disaster restoration processes.Subsequently,it delves into communication and data processing mechanisms,specifically focusing on central data processing(CDP),communication routers(CRs),and phasor measurement units(PMUs),to re-establish an equipment recovery model based on these data transmission methodologies.Furthermore,it introduces a mathematical optimization model designed to enhance the digital twin system’s post-disaster monitoring efficacy by employing the branch-and-bound method for its resolution.The efficacy of the proposed model was corroborated by analyzing an IEEE-14 system.The findings suggest that the proposed branch-and-bound algorithm significantly augments the observational capabilities of a power system with limited resources,thereby bolstering its stability and emergency response mechanisms.
基金This work was supported by the National Natural Science Fund for Excellent Young Scientists Fund Program(Overseas)to Y.Z.,the National Key Research and Development Program of China(grant 2019YFA0906200)the Agricultural Science and Technology Innovation Program(CAAS-ZDRW202101)+1 种基金the Shenzhen Science and Technology Program(grant KQTD2016113010482651)the BMBF-funded de.
文摘Grapevine is one of the most economically important crops worldwide.However,the previous versions of the grapevine reference genome tipically consist of thousands of fragments with missing centromeres and telomeres,limiting the accessibility of the repetitive sequences,the centromeric and telomeric regions,and the study of inheritance of important agronomic traits in these regions.Here,we assembled a telomere-to-telomere(T2T)gap-free reference genome for the cultivar PN40024 using PacBio HiFi long reads.The T2T reference genome(PN_T2T)is 69 Mb longer with 9018 more genes identified than the 12X.v0 version.We annotated 67%repetitive sequences,19 centromeres and 36 telomeres,and incorporated gene annotations of previous versions into the PN_T2T assembly.We detected a total of 377 gene clusters,which showed associations with complex traits,such as aroma and disease resistance.Even though PN40024 derives from nine generations of selfing,we still found nine genomic hotspots of heterozygous sites associated with biological processes,such as the oxidation–reduction process and protein phosphorylation.The fully annotated complete reference genome therefore constitutes an important resource for grapevine genetic studies and breeding programs.
基金supported by the National Natural Science Foundation of China (Nos. 32071687 and 52273247)Jiangsu Qinglan Project
文摘Currently,light-transmitting,energy-saving,and electromagnetic shielding materials are essential for reducing indoor energy consumption and improving the electromagnetic environment.Here,we developed a cellulose composite with excellent optical transmittance that retained the natural shape and fiber structure of bamboo.The modified whole bamboo possessed an impressive optical transmittance of approximately 60%at 6.23 mm,illuminance of 1000 luminance(lux),water absorption stability(mass change rate less than 4%),longitudinal tensile strength(46.40 MPa),and surface properties(80.2 HD).These were attributed to not only the retention of the natural circular hollow structure of the bamboo rod on the macro,but also the complete bamboo fiber skeleton template impregnated with UV resin on the micro.Moreover,a multilayered device consisting of translucent whole bamboo,transparent bamboo sheets,and electromagnetic shielding film exhibited remarkable heat insulation and heat preservation performance as well as an electromagnetic shielding performance of 46.3 dB.The impressive optical transmittance,mechanical properties,thermal performance,and electromagnetic shielding abilities combined with the renewable and sustainable nature,as well as the fast and efficient manufacturing process,make this bamboo composite material suitable for effective application in transparent,energy-saving,and electromagnetic shielding buildings.
基金support from the National Natural Science Foundation of China(51922020,52090034)the Fundamental Research Funds for the Central Universities(BHYC1707B)。
文摘The highly integrated and miniaturized next-generation electronic products call for high-performance electromagnetic interference(EMI)shielding materials to assure the normal operation of their closely assembled components.However,the most current techniques are not adequate for the fabrication of shielding materials with programmable structure and controllable shielding efficiency.Herein,we demonstrate the direct ink writing of robust and highly conductive Ti3C2Tx MXene frames with customizable structures by using MXene/AlOOH inks for tunable EMI shielding and electromagnetic wave-induced thermochromism applications.The as-printed frames are reinforced by immersing in AlCl_(3)/HCl solution to remove the electrically insulating AlOOH nanoparticles,as well as cross-link the MXene sheets and fuse the filament interfaces with aluminum ions.After freeze-drying,the resultant robust and porous MXene frames exhibit tunable EMI shielding efficiencies in the range of 25-80 dB with the highest electrical conductivity of 5323 S m−1.Furthermore,an electromagnetic wave-induced thermochromic MXene pattern is assembled by coating and curing with thermochromic polydimethylsiloxane on a printed MXene pattern,and its color can be changed from blue to red under the high-intensity electromagnetic irradiation.This work demonstrates a direct ink printing of customizable EMI frames and patterns for tuning EMI shielding efficiency and visualizing electromagnetic waves.
基金supported in part by the National Science Foundation (IIS1318638 and IIS1426752)the Shenzhen Science and Technology Project (ZDS Y20120617113312191)
文摘In this paper, we develop a decentralized algorithm to coord inate a group of mobile robots to search for unknown and transient radio sources. In addition to limited mobility and ranges of communication and sensing, the robot team has to deal with challenges from signal source anonymity, short transmission duration, and variable transmission power. We propose a two-step approach: First, we decentralize belief functions that robots use to track source locations using checkpoint-based synchronization, and second, we propose a decentralized planning strategy to coordinate robots to ensure the existence of checkpoints. We analyze memory usage, data amount in communication, and searching time for the proposed algorithm. We have implemented the proposed algorithm and compared it with two heuristics. The experimental results show that our algorithm successfully trades a modest amount of memory for the fastest searching time among the three methods.
基金Project supported by the National Science Foundation of China (Grant Nos. 11653001 and 11653004)。
文摘Multiplexing technologies based on superconducting quantum interference devices(SQUIDs) are crucial to cryogenic readout of superconducting transition-edge sensor(TES) arrays. Demands for large-scale TES arrays promote the development of multiplexing technologies towards large multiplexing factors and low readout noise. The development of multiplexing technologies also facilitates new applications of TES arrays in a wide range of frequencies. Here we summarize different types of SQUID-based multiplexing technologies including time-division multiplexing, code-division multiplexing, frequency-division multiplexing and microwave SQUID multiplexing. The advances and parameter constraints of each multiplexing technology are also discussed.
基金supported by the National Key R&D Program of China(Grant No.2016YFA0200503)。
文摘We investigate gate-regulated transition temperatures for electron hopping behaviours through discrete ionized dopant atoms in silicon junctionless nanowire transistors.We demonstrate that the localization length of the wave function in the spatial distribution is able to be manipulated by the gate electric field.The transition temperatures regulated as the function of the localization length and the density of states near the Fermi energy level allow us to understand the electron hopping behaviours under the influence of thermal activation energy and Coulomb interaction energy.This is useful for future quantum information processing by single dopant atoms in silicon.
基金by the Basic Sientific Research Funds of International Center for Bamboo and Rattan(1632018016)the Special Scientific Research Fund of Construction of High-level teachers Project of Beijing Institute of Fashion Technology(BIFTQG201805)+1 种基金“Nan Taihu Lake elite plan”project([2018]No.2,Huzhou city,Zhejiang province)Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX17-0828).
文摘The cellulose nanocrystals/graphene composite aerogel(CGA)and polyvinyl alcohol/cellulose nanocrystals/graphene composite aerogel(PCGA)were prepared by suspension titration,tert-butanol solution replacement and freeze-drying successively.The removal rates of methyl blue(MB)from water by CGA and PCGA were evaluated and the effects of additions,adsorption time,reaction temperature and pH value of CGA and PCGA on MB removal rate were discussed.It was found that the optimal concentrations of both CGA and PCGA were 2 g∙L-1 in the adsorption reaction process and the adsorption equilibrium was reached within 120 min.The higher the initial pH value of MB solution is,the better the removal effect will be.The adsorption kinetics conformed to the pseudo-second-order kinetic model.The langmuir isothermal adsorption equation showed the maximum adsorption capacities of CGA and PCGA were 125 mg∙g-1 and 110.9 mg∙g-1,respectively.Under the conditions of adsorption time of 120 min,reaction temperature of 323 K,and initial MB solution pH value of 11,both CGA and PCGA had higher removal rates of MB,reaching more than 98%.
基金This research was partially supported by the National Key Research and Development Program of China(2018YFC1507005)Sichuan Science and Technology Program(2020YFG0189,22ZDYF3494)+1 种基金China Postdoctoral Science Foundation(2018M643448)Fundamental Research Funds for the Central Universities,Southwest Minzu University(2022101).
文摘Metaheuristic algorithm is a generalization of heuristic algorithm that can be applied to almost all optimization problems.For optimization problems,metaheuristic algorithm is one of the methods to find its optimal solution or approximate solution under limited conditions.Most of the existing metaheuristic algorithms are designed for serial systems.Meanwhile,existing algorithms still have a lot of room for improvement in convergence speed,robustness,and performance.To address these issues,this paper proposes an easily parallelizable metaheuristic optimization algorithm called team competition and cooperation optimization(TCCO)inspired by the process of human team cooperation and competition.The proposed algorithm attempts to mathematically model human team cooperation and competition to promote the optimization process and find an approximate solution as close as possible to the optimal solution under limited conditions.In order to evaluate the performance of the proposed algorithm,this paper compares the solution accuracy and convergence speed of the TCCO algorithm with the Grasshopper Optimization Algorithm(GOA),Seagull Optimization Algorithm(SOA),Whale Optimization Algorithm(WOA)and Sparrow Search Algorithm(SSA).Experiment results of 30 test functions commonly used in the optimization field indicate that,compared with these current advanced metaheuristic algorithms,TCCO has strong competitiveness in both solution accuracy and convergence speed.
基金Financial support from the National Natural Science Foundation of China(Nos.51922020 and 52090034)the open Foundation of State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology(No.OIC-202201001)are gratefully acknowledged.
文摘Although MXene sheets possess high electrical conductivity and rich surface chemistry and are well suit-able for fabricating electrically conductive nanocomposites for electromagnetic interference(EMI)shield-ing applications,it remains challenging for MXene nanocomposites to achieve tunable EMI shielding per-formances and customized geometries.Herein,an aqueous MXene/sodium alginate ink is developed to print aerogel meshes with customized geometries using a direct ink writing approach.An ion-enhanced strategy is proposed to reinforce the printed aerogel meshes by multi-level cross-linking.The resultant 3D printed aerogel mesh exhibits an ultrahigh electrical conductivity of 2.85×10^(3)S m^(−1),outstanding mechanical properties,and excellent structural stability in wet environment.More importantly,a wide range of tunable EMI shielding efficiencies from 45 to 100 dB is achieved by the structural design of the 3D printed ion-enhanced MXene/sodium alginate aerogel meshes.As a Joule heater,in addition,the printed aerogel meshes can achieve a wide temperature range of 40-135℃at low driving voltages.This work demonstrates a direct ink writing approach for the fabrication of ion-enhanced MXene/sodium al-ginate aerogel meshes with tunable EMI shielding properties and multi-functionalities for applications in many scenarios.
基金supported by the National Key Research and Development Program of China Stem Cell and Translational Research(2019YFA0110700)the National Natural Science Foundation of China(32000359)。
文摘Dear Editor,Base editors can achieve targeted C-to-T and A-to-G conversion without the generation of DNA double-strand breaks(DSBs)or the requirement of a donor template,showing the potential to generate new mutations or to correct pathogenic mutations(Gaudelli et al.,2018).However,for conventional base editors,efficient base editing requires the presence of an NGG protospacer adjacent motif(PAM)that lies 12–16 nt downstream of the target bases,which generally limits the application of these base editors(Gaudelli et al.,2018).
基金National Natural Science Foundation of China(Nos.81860073,81760074,and 82160439)Yunnan Provincial Department of Science and Technology(No.202001AT070039)+10 种基金the Yunnan Health Training Project of High-Level Talents(No.H-2018032)the 100 Young and Middle-aged Academic and Technical Backbones of Kunming Medical University(No.60118260106)the Young Talents of Yunnan Thousand Talents Plan(Nos.YNQR-QNRC-2019-006 and RLQN20200002)the Graduate Student Innovation Fund of Kunming Medical University(No.2022S035)the National Natural Science Foundation of China(Nos.81860073,81760074,and 82160439)Yunnan Provincial Department of Science and Technology(No.202001AT070039)Yunnan Health Training Project of High-Level Talents(No.H-2018032)100 Young and Middle-aged Academic and Technical Backbones of Kunming Medical University(No.60118260106)Young Talents of Yunnan Thousand Talents Plan(Nos.YNQR-QNRC-2019-006 and RLQN20200002)Graduate Student Innovation Fund of Kunming Medical University(No.2022S035)Clinical Medical Center for Cardiovascular and Cerebrovascular Disease of Yunnan Province(No.ZX2019-03-01),China.
文摘Non-exosomal non-coding RNAs(non-exo-ncRNAs)and exosomal ncRNAs(exo-ncRNAs)have been associated with the pathological development of myocardial infarction(MI).Accordingly,this analytical review provides an overview of current MI studies on the role of plasma non-exo/exo-ncRNAs.We summarize the features and crucial roles of ncRNAs and reveal their novel biological correlations via bioinformatics analysis.The following contributions are made:(1)we comprehensively describe the expression profile,competing endogenous RNA(ceRNA)network,and“pre-necrotic”biomarkers of non-exo/exo-ncRNAs for MI;(2)functional enrichment analysis indicates that the target genes of ncRNAs are enriched in the regulation of apoptotic signaling pathway and cellular response to chemical stress,etc.;(3)we propose an updated and comprehensive view on the mechanisms,pathophysiology,and biomarker roles of non-exo/exo-ncRNAs in MI,thereby providing a theoretical basis for the clinical management of MI.
文摘Wearable devices have a long history,even though wearable robots as emerging area is relatively new.An early report of wearable device can be found in the book Tian Gong Kai Wu(天工开物),published in 1637 where an ancient mechanism that was mounted on human body for cotton fluffing was documented.This type of wearable cotton fluffing tool can still be found in rural areas of China today.
基金supported in part by National Key Re search and Development Project under Grant SQ2020YFB130100in part by the National Natural Science Foundation of China under Grants 62022087 and U22A2064+5 种基金in part by the Shenzhen Science and Technology Innovation Commission under Shenzhen Fundamental Research Program under Grant JCYJ20220818101611025in part by the Youth In novation Promotion Association of CAS,in part by the Special Support Project for Outstanding Young Scholars of Guangdong Province under Grant 2019TQ05X933in part by the CAS-Croucher Funding Scheme for Joint Laboratories under Grant 172644KYSB20200044the Croucher Foundation Grant with reference no.CAS20403in part by the Shenzhen Institute of Artificial Intelligence and Robotics for Society,in part by DMETKF2022008in part by SIAT-CUHK Joint Laboratory of Robotics and Intelligent Systems.
文摘Untethered microrobots have attracted extensive attention due to their potential for biomedical applications and micromanipulation at the small scale.Soft microrobots are of great research importance because of their highly deformable ability to achieve not only multiple locomotion mechanisms but also minimal invasion to the environment.However,the existing microrobots are still limited in their ability to locomote and cross obstacles in unstructured environments compared to conventional legged robots.Nature provides much inspiration for developing miniature robots.Here,we propose a bionic quadruped soft thin-film microrobot with a nonmagnetic soft body and 4 magnetic flexible legs.The quadruped soft microrobot can achieve multiple controllable locomotion modes in the external magnetic field.The experiment demonstrated the robot’s excellent obstacle-crossing ability by walking on the surface with steps and moving in the bottom of a stomach model with gullies.In particular,by controlling the conical angle of the external conical magnetic field,microbeads gripping,transportation,and release of the microrobot were demonstrated.In the future,the quadruped microrobot with excellent obstacle-crossing and gripping capabilities will be relevant for biomedical applications and micromanipulation.
基金Project supported by the National Key Research and Development Program of China (No. 2017YFB0102601)the Hubei Provincial Key Research and Development Project,China (No. 2020BAB099)。
文摘Lane changing assistance in autonomous vehicles is a popular research topic. Scene modeling of the driving area is a prerequisite for lane changing decision problems. A road environment representation method based on a dynamic occupancy grid is proposed in this study. The model encapsulates the data such as vehicle speed, obstacles, lane lines, and traffic rules into a form of spatial drivability probability. This information is compiled into a hash table, and the grid map is mapped into a hash map by means of hash function. A vehicle behavior decision cost equation is established with the model to help drivers make accurate vehicle lane changing decisions based on the principle of least cost, while considering influencing factors such as vehicle drivability, safety, and power. The feasibility of the lane changing assistance strategy is verified through vehicle tests, and the results show that the lane changing assistance system based on a probabilistic model of dynamic occupancy grids can provide lane changing assistance to drivers taking into consideration the dynamics and safety.
基金supported by the National Key R&D Program of China(No.2018YFB2002303)the National Natural Science Foundation of China(Nos.52075432,61922093,U1813211,6207330)+1 种基金Hong Kong RGC General Research Fund CityU(11211720)ShenZhen(China)Key Basic Research Project(No.JCYJ20200109114827177).
文摘In situ scanning electron microscope(SEM)characterization have enabled the stretching,compression,and bending of micro/nanomaterials and have greatly expanded our understanding of small-scale phenomena.However,as one of the fundamental approaches for material analytics,torsion tests at a small scale remain a major challenge due to the lack of an ultrahigh precise torque sensor and the delicate sample assembly strategy.Herein,we present a microelectromechanical resonant torque sensor with an ultrahigh resolution of up to 4.78 fN∙m within an ultrawide dynamic range of 123 dB.Moreover,we propose a nanorobotic system to realize the precise assembly of microscale specimens with nanoscale positioning accuracy and to conduct repeatable in situ pure torsion tests for the first time.As a demonstration,we characterized the mechanical properties of Si microbeams through torsion tests and found that these microbeams were five-fold stronger than their bulk counterparts.The proposed torsion characterization system pushes the limit of mechanical torsion tests,overcomes the deficiencies in current in situ characterization techniques,and expands our knowledge regarding the behavior of micro/nanomaterials at various loads,which is expected to have significant implications for the eventual development and implementation of materials science.