Direct regeneration method has been widely concerned by researchers in the field of battery recycling because of its advantages of in situ regeneration,short process and less pollutant emission.In this review,we first...Direct regeneration method has been widely concerned by researchers in the field of battery recycling because of its advantages of in situ regeneration,short process and less pollutant emission.In this review,we firstly analyze the primary causes for the failure of three representative battery cathodes(lithium iron phosphate,layered lithium transition metal oxide and lithium cobalt oxide),targeting at illustrating their underlying regeneration mecha-nism and applicability.Efficient stripping of material from the collector to obtain pure cathode material has become a first challenge in recycling,for which we report several pretreatment methods currently available for subsequent regeneration processes.We review and discuss emphatically the research progress of five direct regeneration methods,including solid-state sintering,hydrothermal,eutectic molten salt,electrochemical and chemical lithiation methods.Finally,the application of direct regeneration technology in production practice is introduced,the problems exposed at the early stage of the industrialization of direct regeneration technol-ogy are revealed,and the prospect of future large-scale commercial production is proposed.It is hoped that this review will give readers a comprehensive and basic understanding of direct regeneration methods for used lithium-ion batteries and promote the industrial application of direct regeneration technology.展开更多
Sepsis is a lethal condition characterized by multiple organ dysfunction due to disrupted host responses to severe infections.[1]Aff ected patients often have a Sequential Organ Failure Assessment(SOFA)score≥2.[2]Pat...Sepsis is a lethal condition characterized by multiple organ dysfunction due to disrupted host responses to severe infections.[1]Aff ected patients often have a Sequential Organ Failure Assessment(SOFA)score≥2.[2]Patients with a SOFA score<2 and at least one of the following were considered as“suspected sepsis”:(1)quick SOFA(qSOFA)score≥2;(2)SOFA score=1;or(3)National Early Warning Score(NEWS)4-6.[3]Compared with studies on fluid resuscitation in sepsis patients,there are few studies on fluid management in patients with suspected sepsis.Therefore,we conducted a retrospective cohort study to evaluate the relationship between fluid management and disease progression in suspected sepsis patients.展开更多
In recent years,with the continuous development of information technology and the rapid growth of network scale,network monitoring and management become more and more important.Network traffic is an important part of ...In recent years,with the continuous development of information technology and the rapid growth of network scale,network monitoring and management become more and more important.Network traffic is an important part of network state.In order to ensure the normal operation of the network,improve the availability of the network,find network faults in time and deal with network attacks;it is necessary to detect the abnormal traffic in the network.Abnormal traffic detection is of great significance in the actual network management.Therefore,in order to improve the accuracy and efficiency of network traffic anomaly detection,this paper proposes a comprehensive anomaly detection method based on improved GRU traffic prediction and improved K-means clustering,and cascade the traffic prediction and clustering to achieve the purpose of anomaly detection.Firstly,an improved highway-GRU algorithm HS-GRU(An improved Gate Recurrent Unit neural network based on Highway network and STL algorithm,HS-GRU)is proposed,which combines STL decomposition algorithm with highway GRU neural network and uses this improved algorithm to predict traffic.And then,we proposed the EFMS-Kmeans algorithm(An improved clustering algorithmthat combined Mean Shift algorithmbased on electrostatic force with K-means clustering)to solve the shortcoming of the traditional K-means clustering which cannot automatically determine the number of clustering.The sum of the squared errors(SSE)method and the contour coefficient method were used to double test the clustering effect.After determining the clustering center,the potential energy gradient was directly used for anomaly detection by using the threshold method,which considered the local characteristics of the data and ensured the accuracy of anomaly detection.The simulation results show that the anomaly detection algorithm based on HS-GRU and EFMS-Kmeans clustering proposed in this paper can effectively improve the accuracy of flow anomaly detection and has important application value.展开更多
Here,we report a Ru/TS-1 catalyst for selective hydrogenolysis of guaiacol to benzene in the aqueous phase at conditions of 240℃ and 0.2 MPa H2,achieving a benzene yield of 86% with a hydrogenolysis rate of 103.1 mmo...Here,we report a Ru/TS-1 catalyst for selective hydrogenolysis of guaiacol to benzene in the aqueous phase at conditions of 240℃ and 0.2 MPa H2,achieving a benzene yield of 86% with a hydrogenolysis rate of 103.1 mmol g^(-1) h^(-1).It was found that Silicalite-1(MFI type) with suitable pore sizes supported Ru nanoparticles(NPs) favored for hydrogenolysis of guaiacol,whereas de-aluminated Ru/HBEA,Ru/HY and Ru/MWW(without acidic sites) accelerated the parallel reactions of hydrogenation of aromatics.In addition,Ru NPs located at the orifice of Silicalite-1 was proved to be more electron-deficient and active than Ru NPs on the outer surface,as evidenced by CO-IR characterization and activity tests on Ru/Silicalite-1(with and without templates).Moreover,Br?nsted acid sites(BAS) on Ru/MFI highly promoted the hydrogenation rates of aromatics,while Lewis acid sites(LAS) on Ru/TS-1 and Ru/MFI led to a linear increase of guaiacol hydrogenolysis rate to benzene,probably due to the enhanced absorbance capability of guaiacol and phenol on the LAS of MFI.Thus,pore structure properties of MFI coupled with abundant LAS(TS-1) as well as Ru NPs on the orifice of pores of TS-1 construct a promising catalyst for achieving efficient aromatic hydrocarbons from selective hydrogenolysis of lignin.展开更多
This paper presents an optimized asymmetric three corrugation-pitch-modulated DFB laser (3CPM-DFB) with extremely high mode selectivity(△αL= 0.97) and low flatness(F = 0.009), which are two key parameters to indicat...This paper presents an optimized asymmetric three corrugation-pitch-modulated DFB laser (3CPM-DFB) with extremely high mode selectivity(△αL= 0.97) and low flatness(F = 0.009), which are two key parameters to indicate the laser’s single longitudinal mode(SLM) performance. In threshold analysis, the optimization process based on transfer matrix method is demonstrated to maximize △αL?and minimize F simultaneously. In the above-threshold regime, the evolutions of △αL?and?longitudinal distribution of photon density with injection current are evaluated. More importantly, nanoimprint lithography which was proved an efficient way to fabricate DFB gratings can provide completely same simple fabrication procedure for both 3CPM grating and conventional uniform grating. So the big practical value of 3CPM-DFB can be expected because of its advanced performance and easy manufacturability.展开更多
Photoresists are radiation-sensitive materials used for forming patterns to build up IC devices.To date,most photoresists have been based on organic polymers,which have been dominating the semiconductor industries ove...Photoresists are radiation-sensitive materials used for forming patterns to build up IC devices.To date,most photoresists have been based on organic polymers,which have been dominating the semiconductor industries over the past few decades.It is obvious that extreme ultraviolet(EUV)lithography has become the next-generation lithography technology.The development of comprehensive performance EUV resist is one of the most critical issues.However,organic polymeric photoresists are difficult to meet the harsh requirements of EUV lithography.Pure inorganic photoresists such as metal salts,hydrogen silsesquioxane(HSQ)are expected for EUV lithography due to their high resistance and high resolution.But the low sensitivity makes them not suitable for high volume manufacturing(HVM).Organic-inorganic hybrid photoresists,containing both organic and inorganic components,are regarded as one of the most promising EUV resists.They combine both merits of organic and inorganic materials and have significant advantages in machinability,etching resistance,EUV absorption,and chemical/thermal stability.Organic-inorganic hybrid photoresists are considered as ideal materials for realizing industrialgrade patterns below 10 nm.This review mainly focuses on the development of organic-inorganic hybrid photoresists over the past decade.展开更多
Frame resolution and physical layer (PHY) protocol type detection are the basis of research and development of intrusion prevention systems for IEEE 802.11 wireless network. Aiming at the problems which cannot be solv...Frame resolution and physical layer (PHY) protocol type detection are the basis of research and development of intrusion prevention systems for IEEE 802.11 wireless network. Aiming at the problems which cannot be solved by the specifications export, this paper proposed a MAC frame analytical method and a PHY protocol type detection algorithm based on parsing the IEEE 802.11packets captured by the library Libpcap. The packet structure and the length of the frame preamble (18 or 26 bytes) are presented. Then the methods of transforming byte-order and resolving sub-fields are given. A detection algorithm of PHY protocol type is proposed based on the experiments and examples are given to verify these methods. This work can be a reference for the R & D related to link layer frame analysis.展开更多
Short Retraction Notice? This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's?Retraction Guidelines. The aim is to promote the circulation o...Short Retraction Notice? This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's?Retraction Guidelines. The aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused. Please see the?article page?for more details. The full retraction notice in PDF is preceding the original paper which is marked "RETRACTED".展开更多
"Elastic-plastic mechanics"is a required course for engineering postgraduates in petroleum colleges and universities,such as students who major in oil and gas storage and transportation engineering.It is the..."Elastic-plastic mechanics"is a required course for engineering postgraduates in petroleum colleges and universities,such as students who major in oil and gas storage and transportation engineering.It is the basis for personnel engaged in structural safety assessment.In the past teaching process,the teaching effects of this course were unsatisfactory.There are many reasons for this phenomenon,such as the strong theoretical nature of this course,the need for a large number of formula derivation,the high requirements for students'mechanical foundation and mathematical foundation,the lack of appropriate teaching materials and the slackness of students'minds.Based on years of teaching experience,the teaching team has reformed the existing teaching materials of“Elastic-plastic mechanics”to meet the needs of petroleum colleges and universities.In this reform,we have referred to a large number of published textbooks of“Elasticplastic mechanics”and the experience of textbook construction at home and abroad.The newly compiled textbook of“Elastic-plastic mechanics”plays a certain role in improving the teaching quality of“Elastic-plastic mechanics”in petroleum colleges and universities.展开更多
An ultrafast fiber laser system comprising two coherently combined amplifier channels is reported.Within this system,each channel incorporates a rod-type fiber power amplifier,with individual operations reaching appro...An ultrafast fiber laser system comprising two coherently combined amplifier channels is reported.Within this system,each channel incorporates a rod-type fiber power amplifier,with individual operations reaching approximately 233 W.The active-locking of these coherently combined channels,followed by compression using gratings,yields an output with a pulse energy of 504μJ and an average power of 403 W.Exceptional stability is maintained,with a 0.3%root mean square(RMS)deviation and a beam quality factor M^(2)<1.2.Notably,precise dispersion management of the front-end seed light effectively compensates for the accumulated high-order dispersion in subsequent amplification stages.This strategic approach results in a significant reduction in the final output pulse duration for the coherently combined laser beam,reducing it from 488 to 260 fs after the gratings compressor,while concurrently enhancing the energy of the primary peak from 65%to 92%.展开更多
Background:Given that seizures may be triggered by vaccination,this study aimed to evaluate the risk and correlative factors of seizures in patients with epilepsy(PWE)after being vaccinated against coronavirus disease...Background:Given that seizures may be triggered by vaccination,this study aimed to evaluate the risk and correlative factors of seizures in patients with epilepsy(PWE)after being vaccinated against coronavirus disease 2019(COVID-19).Methods:This study retrospectively enrolled PWE who were vaccinated against COVID-19 in the epilepsy centers of 11 hospitals in China.We divided the PWE into two groups as follows:(1)patients who developed seizures within 14 days of vaccination were assigned to the SAV(with seizures after vaccination)group;(2)patients who were seizure-free within 14 days of vaccination were assigned to the SFAV(seizure-free after vaccination)group.To identify potential risk factors for seizure reccurence,the binary logistic regression analysis was performed.Besides,67 PWE who had not been vaccinated were also included for elucidating the effects of vaccination on seizures recurrence,and binary logistic regression analysis was performed to determine whether vaccination would affect the recurrence rate of PWE who had drug reduction or withdrawal.Results:The study included a total of 407 patients;of which,48(11.8%)developed seizures within 14 days after vaccination(SAV group),whereas 359(88.2%)remained seizure-free(SFAV group).The binary logistic regression analysis revealed that duration of seizure freedom(P<0.001)and withdrawal from anti-seizure medications(ASMs)or reduction in their dosage during the peri-vaccination period were significantly associated with the recurrence of seizures(odds ratio=7.384,95%confidence interval=1.732–31.488,P=0.007).In addition,32 of 33 patients(97.0%)who were seizure-free for more than three months before vaccination and had a normal electroencephalogram before vaccination did not have any seizures within 14 days of vaccination.A total of 92(22.6%)patients experienced non-epileptic adverse reactions after vaccination.Binary logistic regression analysis results showed that vaccine did not significantly affect the recurrence rate of PWE who had the behavior of ASMs dose reduction or withdrawal(P=0.143).Conclusions:PWE need protection from the COVID-19 vaccine.PWE who are seizure-free for>3 months before vaccination should be vaccinated.Whether the remaining PWE should be vaccinated depends on the local prevalence of COVID-19.Finally,PWE should avoid discontinuing ASMs or reducing their dosage during the peri-vaccination period.展开更多
The development of multiscale fiber-reinforced composite powders is an effective way to improve the mechanical properties and functionality of additively manufactured parts.Herein,a novel thermally induced precipitati...The development of multiscale fiber-reinforced composite powders is an effective way to improve the mechanical properties and functionality of additively manufactured parts.Herein,a novel thermally induced precipitation process is proposed for preparing multiscale fiber-reinforced powders.A systematic evaluation was conducted to explore the main factors influencing powder morphology,powder flow,and microstructure.In the powder-forming mechanism,the polymer matrix is coated on the microfiber,and a film of carbon nanotubes covers the powder surface,which is promoted by heterogeneous nucleation.The composite powders comprised polyamide 12,carbon fiber(CF),and carbon nanotubes,which have been successfully applied in powder bed fusion processes including selective laser sintering(SLS).Smooth flow and powder deposition were observed,and the composite components obtained via SLS were well-fabricated using the optimized process parameters.A CF loading ratio of up to 66.7 wt%and homogeneous fiber distribution within the matrix were successfully achieved.展开更多
The Highlights session of the article unfortunately was taken falsely from another manuscript.The correct Highlights session is now in place.The correct is:Analyze the primary causes of cathode failure in three repres...The Highlights session of the article unfortunately was taken falsely from another manuscript.The correct Highlights session is now in place.The correct is:Analyze the primary causes of cathode failure in three representative batteries,illustrating their underlying regeneration mechanism.展开更多
基金supported by the National Key Research and Development Program of China(No.2023YFC3904800)the Key Project of Jiangxi Provincial Research and Development Program(No.20223BBG74006)+5 种基金the Key Project of Ganzhou City Research and Development Program(No.2023PGX17350)“Thousand Talents Program”of Jiangxi Province(No.001043232090)Science&Technology Talents Lifting Project of Hunan Province(No.2022TJ-N16)Natural Science Foundation of Hunan Province(Nos.2024JJ4022 and 2023JJ30277)China Postdoctoral Fellowship Program(No.GZC20233205)the Open-End Fund for National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization(ES202480184).
文摘Direct regeneration method has been widely concerned by researchers in the field of battery recycling because of its advantages of in situ regeneration,short process and less pollutant emission.In this review,we firstly analyze the primary causes for the failure of three representative battery cathodes(lithium iron phosphate,layered lithium transition metal oxide and lithium cobalt oxide),targeting at illustrating their underlying regeneration mecha-nism and applicability.Efficient stripping of material from the collector to obtain pure cathode material has become a first challenge in recycling,for which we report several pretreatment methods currently available for subsequent regeneration processes.We review and discuss emphatically the research progress of five direct regeneration methods,including solid-state sintering,hydrothermal,eutectic molten salt,electrochemical and chemical lithiation methods.Finally,the application of direct regeneration technology in production practice is introduced,the problems exposed at the early stage of the industrialization of direct regeneration technol-ogy are revealed,and the prospect of future large-scale commercial production is proposed.It is hoped that this review will give readers a comprehensive and basic understanding of direct regeneration methods for used lithium-ion batteries and promote the industrial application of direct regeneration technology.
文摘Sepsis is a lethal condition characterized by multiple organ dysfunction due to disrupted host responses to severe infections.[1]Aff ected patients often have a Sequential Organ Failure Assessment(SOFA)score≥2.[2]Patients with a SOFA score<2 and at least one of the following were considered as“suspected sepsis”:(1)quick SOFA(qSOFA)score≥2;(2)SOFA score=1;or(3)National Early Warning Score(NEWS)4-6.[3]Compared with studies on fluid resuscitation in sepsis patients,there are few studies on fluid management in patients with suspected sepsis.Therefore,we conducted a retrospective cohort study to evaluate the relationship between fluid management and disease progression in suspected sepsis patients.
基金supported by the National Natural Science Foundation of China (U21A20119)the championship prize funded by Shenzhen Leaguer Co., Ltd.supported in part by the Fundamental Research Funds for the Central Universities。
基金supported by National Key R&D Program of China(2019YFB2103202,2019YFB2103200)Open Subject Funds of Science and Technology on Communication Networks Laboratory(6142104200106).
文摘In recent years,with the continuous development of information technology and the rapid growth of network scale,network monitoring and management become more and more important.Network traffic is an important part of network state.In order to ensure the normal operation of the network,improve the availability of the network,find network faults in time and deal with network attacks;it is necessary to detect the abnormal traffic in the network.Abnormal traffic detection is of great significance in the actual network management.Therefore,in order to improve the accuracy and efficiency of network traffic anomaly detection,this paper proposes a comprehensive anomaly detection method based on improved GRU traffic prediction and improved K-means clustering,and cascade the traffic prediction and clustering to achieve the purpose of anomaly detection.Firstly,an improved highway-GRU algorithm HS-GRU(An improved Gate Recurrent Unit neural network based on Highway network and STL algorithm,HS-GRU)is proposed,which combines STL decomposition algorithm with highway GRU neural network and uses this improved algorithm to predict traffic.And then,we proposed the EFMS-Kmeans algorithm(An improved clustering algorithmthat combined Mean Shift algorithmbased on electrostatic force with K-means clustering)to solve the shortcoming of the traditional K-means clustering which cannot automatically determine the number of clustering.The sum of the squared errors(SSE)method and the contour coefficient method were used to double test the clustering effect.After determining the clustering center,the potential energy gradient was directly used for anomaly detection by using the threshold method,which considered the local characteristics of the data and ensured the accuracy of anomaly detection.The simulation results show that the anomaly detection algorithm based on HS-GRU and EFMS-Kmeans clustering proposed in this paper can effectively improve the accuracy of flow anomaly detection and has important application value.
基金supported by the National Key Research and Development Program of China (Grant No. 2016YFB0701100)the Recruitment Program of Global Young Experts in China, Natural Science Foundation of China (Grant No. 21573075)。
文摘Here,we report a Ru/TS-1 catalyst for selective hydrogenolysis of guaiacol to benzene in the aqueous phase at conditions of 240℃ and 0.2 MPa H2,achieving a benzene yield of 86% with a hydrogenolysis rate of 103.1 mmol g^(-1) h^(-1).It was found that Silicalite-1(MFI type) with suitable pore sizes supported Ru nanoparticles(NPs) favored for hydrogenolysis of guaiacol,whereas de-aluminated Ru/HBEA,Ru/HY and Ru/MWW(without acidic sites) accelerated the parallel reactions of hydrogenation of aromatics.In addition,Ru NPs located at the orifice of Silicalite-1 was proved to be more electron-deficient and active than Ru NPs on the outer surface,as evidenced by CO-IR characterization and activity tests on Ru/Silicalite-1(with and without templates).Moreover,Br?nsted acid sites(BAS) on Ru/MFI highly promoted the hydrogenation rates of aromatics,while Lewis acid sites(LAS) on Ru/TS-1 and Ru/MFI led to a linear increase of guaiacol hydrogenolysis rate to benzene,probably due to the enhanced absorbance capability of guaiacol and phenol on the LAS of MFI.Thus,pore structure properties of MFI coupled with abundant LAS(TS-1) as well as Ru NPs on the orifice of pores of TS-1 construct a promising catalyst for achieving efficient aromatic hydrocarbons from selective hydrogenolysis of lignin.
文摘This paper presents an optimized asymmetric three corrugation-pitch-modulated DFB laser (3CPM-DFB) with extremely high mode selectivity(△αL= 0.97) and low flatness(F = 0.009), which are two key parameters to indicate the laser’s single longitudinal mode(SLM) performance. In threshold analysis, the optimization process based on transfer matrix method is demonstrated to maximize △αL?and minimize F simultaneously. In the above-threshold regime, the evolutions of △αL?and?longitudinal distribution of photon density with injection current are evaluated. More importantly, nanoimprint lithography which was proved an efficient way to fabricate DFB gratings can provide completely same simple fabrication procedure for both 3CPM grating and conventional uniform grating. So the big practical value of 3CPM-DFB can be expected because of its advanced performance and easy manufacturability.
基金Financial support from the National Natural Science Foundation of China(22090012,U20A20144,21873106,22073108 and 21903085)the Ministry of Science and Technology of China Major Project(2018ZX02102005,2011ZX02701)is gratefully acknowledged.
文摘Photoresists are radiation-sensitive materials used for forming patterns to build up IC devices.To date,most photoresists have been based on organic polymers,which have been dominating the semiconductor industries over the past few decades.It is obvious that extreme ultraviolet(EUV)lithography has become the next-generation lithography technology.The development of comprehensive performance EUV resist is one of the most critical issues.However,organic polymeric photoresists are difficult to meet the harsh requirements of EUV lithography.Pure inorganic photoresists such as metal salts,hydrogen silsesquioxane(HSQ)are expected for EUV lithography due to their high resistance and high resolution.But the low sensitivity makes them not suitable for high volume manufacturing(HVM).Organic-inorganic hybrid photoresists,containing both organic and inorganic components,are regarded as one of the most promising EUV resists.They combine both merits of organic and inorganic materials and have significant advantages in machinability,etching resistance,EUV absorption,and chemical/thermal stability.Organic-inorganic hybrid photoresists are considered as ideal materials for realizing industrialgrade patterns below 10 nm.This review mainly focuses on the development of organic-inorganic hybrid photoresists over the past decade.
文摘Frame resolution and physical layer (PHY) protocol type detection are the basis of research and development of intrusion prevention systems for IEEE 802.11 wireless network. Aiming at the problems which cannot be solved by the specifications export, this paper proposed a MAC frame analytical method and a PHY protocol type detection algorithm based on parsing the IEEE 802.11packets captured by the library Libpcap. The packet structure and the length of the frame preamble (18 or 26 bytes) are presented. Then the methods of transforming byte-order and resolving sub-fields are given. A detection algorithm of PHY protocol type is proposed based on the experiments and examples are given to verify these methods. This work can be a reference for the R & D related to link layer frame analysis.
文摘Short Retraction Notice? This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's?Retraction Guidelines. The aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused. Please see the?article page?for more details. The full retraction notice in PDF is preceding the original paper which is marked "RETRACTED".
文摘"Elastic-plastic mechanics"is a required course for engineering postgraduates in petroleum colleges and universities,such as students who major in oil and gas storage and transportation engineering.It is the basis for personnel engaged in structural safety assessment.In the past teaching process,the teaching effects of this course were unsatisfactory.There are many reasons for this phenomenon,such as the strong theoretical nature of this course,the need for a large number of formula derivation,the high requirements for students'mechanical foundation and mathematical foundation,the lack of appropriate teaching materials and the slackness of students'minds.Based on years of teaching experience,the teaching team has reformed the existing teaching materials of“Elastic-plastic mechanics”to meet the needs of petroleum colleges and universities.In this reform,we have referred to a large number of published textbooks of“Elasticplastic mechanics”and the experience of textbook construction at home and abroad.The newly compiled textbook of“Elastic-plastic mechanics”plays a certain role in improving the teaching quality of“Elastic-plastic mechanics”in petroleum colleges and universities.
基金supported by the National Natural Science Foundation of China(NSFC)(Grant Nos.9215010612021004,and 11934006)the Innovation Project of Optics Valley Laboratory(No.OVL2021ZD001),the Major Program(JD)of Hubei Province(No.203BAA015)the Cross Research Support Program of Huazhong University of Science and Technology(No.2023JCYJ041).
文摘An ultrafast fiber laser system comprising two coherently combined amplifier channels is reported.Within this system,each channel incorporates a rod-type fiber power amplifier,with individual operations reaching approximately 233 W.The active-locking of these coherently combined channels,followed by compression using gratings,yields an output with a pulse energy of 504μJ and an average power of 403 W.Exceptional stability is maintained,with a 0.3%root mean square(RMS)deviation and a beam quality factor M^(2)<1.2.Notably,precise dispersion management of the front-end seed light effectively compensates for the accumulated high-order dispersion in subsequent amplification stages.This strategic approach results in a significant reduction in the final output pulse duration for the coherently combined laser beam,reducing it from 488 to 260 fs after the gratings compressor,while concurrently enhancing the energy of the primary peak from 65%to 92%.
基金National Natural Science Foundation of China(No.81873786)
文摘Background:Given that seizures may be triggered by vaccination,this study aimed to evaluate the risk and correlative factors of seizures in patients with epilepsy(PWE)after being vaccinated against coronavirus disease 2019(COVID-19).Methods:This study retrospectively enrolled PWE who were vaccinated against COVID-19 in the epilepsy centers of 11 hospitals in China.We divided the PWE into two groups as follows:(1)patients who developed seizures within 14 days of vaccination were assigned to the SAV(with seizures after vaccination)group;(2)patients who were seizure-free within 14 days of vaccination were assigned to the SFAV(seizure-free after vaccination)group.To identify potential risk factors for seizure reccurence,the binary logistic regression analysis was performed.Besides,67 PWE who had not been vaccinated were also included for elucidating the effects of vaccination on seizures recurrence,and binary logistic regression analysis was performed to determine whether vaccination would affect the recurrence rate of PWE who had drug reduction or withdrawal.Results:The study included a total of 407 patients;of which,48(11.8%)developed seizures within 14 days after vaccination(SAV group),whereas 359(88.2%)remained seizure-free(SFAV group).The binary logistic regression analysis revealed that duration of seizure freedom(P<0.001)and withdrawal from anti-seizure medications(ASMs)or reduction in their dosage during the peri-vaccination period were significantly associated with the recurrence of seizures(odds ratio=7.384,95%confidence interval=1.732–31.488,P=0.007).In addition,32 of 33 patients(97.0%)who were seizure-free for more than three months before vaccination and had a normal electroencephalogram before vaccination did not have any seizures within 14 days of vaccination.A total of 92(22.6%)patients experienced non-epileptic adverse reactions after vaccination.Binary logistic regression analysis results showed that vaccine did not significantly affect the recurrence rate of PWE who had the behavior of ASMs dose reduction or withdrawal(P=0.143).Conclusions:PWE need protection from the COVID-19 vaccine.PWE who are seizure-free for>3 months before vaccination should be vaccinated.Whether the remaining PWE should be vaccinated depends on the local prevalence of COVID-19.Finally,PWE should avoid discontinuing ASMs or reducing their dosage during the peri-vaccination period.
基金This work was supported by National Natural Science Foundation of China(Grant Nos.551905439,U1930207).
文摘The development of multiscale fiber-reinforced composite powders is an effective way to improve the mechanical properties and functionality of additively manufactured parts.Herein,a novel thermally induced precipitation process is proposed for preparing multiscale fiber-reinforced powders.A systematic evaluation was conducted to explore the main factors influencing powder morphology,powder flow,and microstructure.In the powder-forming mechanism,the polymer matrix is coated on the microfiber,and a film of carbon nanotubes covers the powder surface,which is promoted by heterogeneous nucleation.The composite powders comprised polyamide 12,carbon fiber(CF),and carbon nanotubes,which have been successfully applied in powder bed fusion processes including selective laser sintering(SLS).Smooth flow and powder deposition were observed,and the composite components obtained via SLS were well-fabricated using the optimized process parameters.A CF loading ratio of up to 66.7 wt%and homogeneous fiber distribution within the matrix were successfully achieved.
文摘The Highlights session of the article unfortunately was taken falsely from another manuscript.The correct Highlights session is now in place.The correct is:Analyze the primary causes of cathode failure in three representative batteries,illustrating their underlying regeneration mechanism.
