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Promoting ion adsorption and desolvation kinetics enables high capacity and rate capability of stibium anode for advanced alkaline battery

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Journal of Materials Science & Technology 2022年第36期131卷 60-67页

作者： Peng Zhang jinhao xie Fan Yang Xin Shi Yanxia Yu Xihong Lu College of Materials Science and Engineering Guangdong Provincial Engineering Technology Research Center of Key Material for High Performance Copper Clad LaminateDongguan Cleaner Production CenterDongguan University of TechnologyDongguan 523808China MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry The Key Lab of Low-carbon Chem and Energy Conservation of Guangdong ProvinceSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275China School of Applied Physics and Materials Wuyi UniversityJiangmen 529020China

Stibium(Sb)metal with high theoretic capacity,suitable negative working window and inexpensive nature are promising anode material for advanced aqueous alkaline batteries(AABs).However,the further development of Sb anode is severely hindered by the low capacity and poor rate capability which is originated from deficient adsorption of[Sb(OH)_(4)]^(-)and its sluggish desolvation kinetics.Herein,a nitrogen doped carbon cages(NCCs)substrate is constructed as high capacity and rate capability anode by promoting the adsorption and following desolvation process of[Sb(OH)_(4)]^(-)via the enhanced attraction toward(OH)-in the solvated[Sb(OH)_(4)]^(-).Consequently,the designed Sb/NCCs anode delivers a high capacity of 627 m Ah g^(-1)with an average 95%Sb utilization,an outstanding coulombic efficiency(CE)of 95%and an impressive lifespan(>110 h).Meanwhile,the Ni_(3)Se_(2)//Sb/NCCs batteries show great capacity retention of 86.7%after 2000 cycles with an areal capacity of 0.52 m Ah cm^(-2).Implementation of the designed anode allows for the construction of Sb-based AABs with enhanced rate capability,energy density and cycling performance.

关键词： Aqueous alkaline batteries Stibium anode N-doped carbon Ion adsorption Desolvation kinetics

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Recent progress and challenges of carbon materials for Zn-ion hybrid supercapacitors

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Carbon Energy 2020年第4期2卷 521-539页

作者： Qiyu Liu Haozhe Zhang jinhao xie Xiaoqing Liu Xihong Lu MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry The Key Lab of Low-carbon Chem and Energy Conservation of Guangdong ProvinceSchool of ChemistrySun Yat-Sen UniversityGuangzhouChina School of Applied Physics and Materials Wuyi UniversityJiangmenChina

Zinc-ion hybrid supercapacitors(ZHSCs)have garnered increasing attention as promising energy storage devices in recent years,as they combine the advantages of high-energy Zn-ion batteries and high-power supercapacitors.However,the development of ZHSCs is still in its infancy and there are many bottlenecks to overcome.In particular,the challenge induced by the limited ion adsorption capability of carbon-positive electrodes severely restricts the energy density of ZHSCs.Therefore,it has become a key issue to design novel carbon-positive electrodes that enable high energy density yet do not deteriorate the intrinsic power capability and long-term durability.This study focuses on recent achievements in synthesis,morphology,and electrochemical performance of various carbon materials applied in ZHSCs.The modification strategies to optimize their electrochemical performance are briefly summarized.In addition,current challenges and future opportunities in this field are also outlined.This review will be beneficial to provide an organized framework for the research systems of carbon-positive electrodes and develop novel ZHSCs with high energy density.

关键词： carbon energy density graphene zinc-ion hybrid supercapacitors

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冗余电源自动电流均衡控制策略

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电子科技 2024年第5期37卷 38-46页

作者：迟康伟谢素霞黄松王锦浩上海理工大学机械工程学院上海200093

冗余电源常用于需要不间断操作以及高可靠性的系统,当其作为N+1备份电源同时向设备供电时,还需考虑并联均流问题。针对无源冗余电源损耗大以及不能实现电流均衡的问题,文中采用了有源冗余的设计方案,设计了一个两路直流电压并联输入的1+... 详细信息

冗余电源常用于需要不间断操作以及高可靠性的系统,当其作为N+1备份电源同时向设备供电时,还需考虑并联均流问题。针对无源冗余电源损耗大以及不能实现电流均衡的问题,文中采用了有源冗余的设计方案,设计了一个两路直流电压并联输入的1+1冗余供电系统。该系统采用兆易创新GD32E103为主控芯片,通过改变MOSFET(Metal-Oxide Semiconductor Field Effect Transistor)的导通电阻,采用PI(Proportional Integral)控制实现两路冗余电源输出电流的自动均衡。仿真和实验结果表明,有源冗余设计方案能达到自动电流均衡的目的。在正常工作时,两路电流的最大误差小于0.1 A,均流精度满足设计要求。

关键词：冗余电源场效应晶体管比例积分控制自动电流均衡低功耗高精度微控制器脉冲宽度调制低电压

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Neural network hyperparameter optimization based on improved particle swarm optimization

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High Technology Letters 2023年第4期29卷 427-433页

作者：谢晓燕 HE Wanqi ZHU Yun YU jinhao School of Computer Xi’an University of Posts and TelecommunicationsXi’an 710121P.R.China School of Electronic Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121P.R.China

Hyperparameter optimization is considered as one of the most challenges in deep learning and dominates the precision of model in a certain.Recent proposals tried to solve this issue through the particle swarm optimization(PSO),but its native defect may result in the local optima trapped and convergence difficulty.In this paper,the genetic operations are introduced to the PSO,which makes the best hyperparameter combination scheme for specific network architecture be located easier.Spe-cifically,to prevent the troubles caused by the different data types and value scopes,a mixed coding method is used to ensure the effectiveness of particles.Moreover,the crossover and mutation opera-tions are added to the process of particles updating,to increase the diversity of particles and avoid local optima in searching.Verified with three benchmark datasets,MNIST,Fashion-MNIST,and CIFAR10,it is demonstrated that the proposed scheme can achieve accuracies of 99.58%,93.39%,and 78.96%,respectively,improving the accuracy by about 0.1%,0.5%,and 2%,respectively,compared with that of the PSO.

关键词： hyperparameter optimization particle swarm optimization(PSO)algorithm neu-ral network

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基于波形测试的异质结双极型晶体管器件负载失配影响分析

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强激光与粒子束 2024年第1期36卷 30-36页

作者：张津豪苏江涛谢炜誉邵世缘徐魁文李文钧杭州电子科技大学浙江省大规模集成电路设计重点实验室杭州310018

大功率电磁脉冲冲击下,射频集成微系统内部容易产生负载失配问题,严重者可能导致系统失效甚至损毁。采用实时的波形测试方法,对射频器件的负载失配进而导致器件损毁的机理进行了分析。该方法以矢量网络分析仪作为主要测试仪器,结合回波... 详细信息

大功率电磁脉冲冲击下,射频集成微系统内部容易产生负载失配问题,严重者可能导致系统失效甚至损毁。采用实时的波形测试方法,对射频器件的负载失配进而导致器件损毁的机理进行了分析。该方法以矢量网络分析仪作为主要测试仪器,结合回波信号注入和相位参考模块获得待测器件实时电压电流波形,进而分析其负载失配影响机制。采用有源负载牵引技术模拟大功率耦合电磁脉冲注入,进行了电压驻波比39∶1的失配测试,大幅提升了测试范围。创新性地采用了谐波信号源注入模拟杂散谐波电磁干扰,评估器件的谐波阻抗失配特性。通过实际异质结双极型晶体管(HBT)器件测试的结果表明,基波的失配会造成负载端电压过大,增加器件的易损性;基波和谐波频率的干扰分量组合使得输出电压瞬态峰值升高,造成器件的损毁。在进行电磁安全防护时,应同时考虑基波和谐波频率的防护。

关键词：负载失配波形测试异质结双极型晶体管电磁安全防护

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湛江乡村幼儿园幼小衔接现状调查

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黑龙江科学 2024年第3期15卷 78-80,83页

作者：王萍谢文斯刘峻萍邓劲豪周宇坤黄国瑞潘冬冬湛江幼儿师范专科学校广东湛江524000

为更好地做好幼儿园的幼小衔接工作,通过问卷与访谈调查法对湛江市乡村幼儿园幼小衔接现状进行调查。研究发现,湛江乡村幼儿园幼小衔教育中,存在家长对幼小衔接的认识程度不高,家长对幼儿进行的幼小衔接教育不完善,幼儿园教师超前教授... 详细信息

为更好地做好幼儿园的幼小衔接工作,通过问卷与访谈调查法对湛江市乡村幼儿园幼小衔接现状进行调查。研究发现,湛江乡村幼儿园幼小衔教育中,存在家长对幼小衔接的认识程度不高,家长对幼儿进行的幼小衔接教育不完善,幼儿园教师超前教授幼儿识字算数等课程,小学教师与家长的衔接观念完全一致等问题,建立健全家长工作机制,提升幼儿园教师专业素养,引导小学教师重视孩子的全面发展等,是提升幼小衔接教育质量的重要路径。

关键词：幼小衔接幼儿园教师小学教师湛江市

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Recent progress on high-temperature superconducting filters

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Superconductivity 2022年第2期2卷 28-38页

作者： Chi Zhang Wei xie Chunguang Li jinhao Dai Yuefeng Yuan Runbo Jiang Xu Wang Jia Wang Yun Wu Liang Sun Yusheng He Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Southwest China Research Institute of Electronic Equipment Chengdu 610036China Henan University of Science and Technology Luoyang 471000China Songshan Lake Materials Laboratory Dongguan 523808China

Since the discovery of high temperature superconducting(HTS)materials in 1987,the performance of microwave filters such as insertion loss,selectivity,and out-band rejection has been significantly improved by utilizing HTS films.Nowadays,HTS filters have been widely used in wireless communications,space exploration,satellite communications,and several other fields.HTS filters with a special performance,such as wideband,dual-band or multiband,frequency tunable,and high power-handling capability have been designed and fabricated in recent years to meet the increasing requirements of practical applications and to further extend the application areas.This paper reviews the various types of above-mentioned HTS filters as well as the developments of novel design methodologies.

关键词： High-temperature superconductors Microwave filters Wideband Dual-band Frequency-tunable High power handling

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Syntheses and Insecticidal Activity of Spirocyclic Tetronic Acid Derivatives Containing Oxime Ether Moiety

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Chemical Research in Chinese Universities 2020年第5期36卷 810-815页

作者： ZHAO Yang CHENG Jingli xie Zhengang FANG Shaowei ZHAO jinhao Ministty of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insert Institute of Pesticide and Environmental ToxicologyZhejiang UniversityHangzhou 310058P.R.China

In order to develop novel spirocyclic tetronic acid lead compounds,a series of new spirocyclic tetronic acid derivatives containing oxime ether moiety was synthesized and bioassayed.The stmctures of 16 target compounds were characterized by lH NMR spectra,13C NMR spectra and high-resolution mass spectrometer(HRMS).Preliminary bioassays indicated that most of the title compounds displayed excellent insecticidal activity against Aphis fabae and Nilapmyata lugens at 100 mg/L.In particular,compound 6k showed the similar activity(LC50=6.87 mg/L)against A.fabae as the spirotetramat(LC50=4.56 mg/L)and had better efIects(LC50=l.64 mg/L)against N.lugens in comparison with spirotetramat(LC5o=7.90 mg/L).The study showed that compound 6k exhibited more promising and broad-spectrum insecticide activity and may serve as a new insecticidal agent for sucking pests.

关键词： Spirocyclic tetronic acid derivative Insecticidal activity Oxime ether moiety

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Precise base editing of non-allelic acetolactate synthase genes confers sulfonylurea herbicide resistance in maize

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The Crop Journal 2020年第3期8卷 449-456页

作者： Yanmin Li Jinjie Zhu Hao Wu Changlin Liu Changling Huang jinhao Lan Yanming Zhao Chuanxiao xie Institute of Crop Sciences Chinese Academy of Agricultural SciencesNational Key Facility for Crop Gene Resources and Genetic ImprovementBeijing 100081China Qingdao Agricultural University Qingdao 266109ShandongChina Anhui Agricultural University Hefei 230036AnhuiChina

Single-nucleotide polymorphisms contribute to phenotypic diversity in maize. Creation and functional annotation of point mutations has been limited by the low efficiency of conventional methods based on random mutation. An efficient tool for generating targeted single-base mutations is desirable for both functional genomics and precise genetic improvement. The objective of this study was to test the efficiency of targeted C-to-T base editing of two non-allelic acetolactate synthase(ALS) in generating sulfonylurea herbicide-resistant mutants. A CRISPR/Cas9 nickase-cytidine deaminase fused with uracil DNA glycosylase inhibitor(UGI) was employed to achieve targeted conversion of cytosine to thymine in ZmALS1 and ZmALS2. Both protoplasts and recovered mutant plants showed the activity of the cytosine base editor, with an in vivo efficiency of up to 13.8%. Transgene-free edited plants harboring a homozygous ZmALS1 mutation or a ZmALS1 and ZmALS2 double mutation were tested for their resistance at a dose of up to 15-fold the recommended limit of chlorsulfuron, a sulfonylurea herbicide widely used in agriculture. Targeted base editing of C-to-T per se and a phenotype verified in the generated mutants demonstrates the power of base editing in precise maize breeding.

关键词： Precise base editing of non-allelic acetolactate synthase genes confers sulfonylurea herbicide resistance in maize

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青年知识移民就业城市选择及其影响因素——以广州市高校大学生为例

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热带地理 2022年第3期42卷 385-395页

作者：谢圆圆李锦昊马凌广州大学地理科学与遥感学院广州510006 华南人文地理与城市发展研究中心广州510006 广东省移民与城市研究中心广州510006

随着城市知识经济转型,各个城市越来越重视对知识人才包括青年知识人才的吸引。以广州市高校大学生为例,采用定性和定量相结合的方法,从城市与个人的双重视角探讨高校青年知识移民就业城市选择的特点及其影响因素。研究发现:1)青年知识... 详细信息

随着城市知识经济转型,各个城市越来越重视对知识人才包括青年知识人才的吸引。以广州市高校大学生为例,采用定性和定量相结合的方法,从城市与个人的双重视角探讨高校青年知识移民就业城市选择的特点及其影响因素。研究发现:1)青年知识移民总体上倾向于选择其本科或研究生就读地所在的城市和比其户籍地与就读地更高等级的城市(如一线、新一线城市)就业,这反映了他们向上空间流动和社会流动的意愿与动机;2)他们的就业流动是城市因素和个人因素共同作用的结果,其影响因素主要包括城市经济、城市环境、城市政策与城市文化,以及青年知识移民来源地的户籍类型与户籍地的城市等级等;3)城市经济发展(工作机会)是吸引高校青年知识移民的最重要因素,但与此同时,生存舒适度(生活机会)在青年知识移民的就业流动过程中所起的作用愈发重要,城市环境建设需要关注公共文化设施、社会舒适程度、交通便利程度、卫生服务设施以及城市自然环境和居住环境等方面的问题。个人因素方面,高校青年知识移民来源地的户籍类型与户籍地的城市等级对其就业流动决策具有显著的影响作用。细致探究青年知识移民就业流动规律及其影响因素是新时期理解和建构基于中国语境的知识型人才流动理论的需要,也是人才政策制定与知识人才实现自身价值的关键。

关键词：青年知识移民就业城市选择工作机会生活机会广州

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