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Bifunctional TiO_(2-x)nanofibers enhanced gel polymer electrolyte for high performance lithium metal batteries

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Journal of Energy Chemistry 2024年第2期89卷 437-448,I0011页

作者： Yixin Wu Zhen chen Yang Wang Yu Li Chunxing Zhang Yihui Zhu Ziyu Yue Xin Liu minghua chen Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080HeilongjiangChina

Exploration of advanced gel polymer electrolytes(GPEs)represents a viable strategy for mitigating dendritic lithium(Li)growth,which is crucial in ensuring the safe operation of high energy density Li metal batteries(LMBs).Despite this,the application of GPEs is still hindered by inadequate ionic conductivity,low Li^(+)transference number,and subpar physicochemical ***,Ti O_(2-x)nanofibers(NF)with oxygen vacancy defects were synthesized by a one-step process as inorganic fillers to enhance the thermal/mechanical/ionic-transportation performances of composite *** characterizations and theoretical calculations reveal that the oxygen vacancies on the surface of Ti O_(2-x)NF accelerate the dissociation of Li PF_6,promote the rapid transfer of free Li^(+),and influence the formation of Li F-enriched solid electrolyte ***,the composite GPEs demonstrate enhanced ionic conductivity(1.90m S cm^(-1)at room temperature),higher lithium-ion transference number(0.70),wider electrochemical stability window(5.50 V),superior mechanical strength,excellent thermal stability(210℃),and improved compatibility with lithium,resulting in superior cycling stability and rate performance in both Li||Li,Li||Li Fe PO_(4),and Li||Li Ni_(0.8)Co_(0.1)Mn_(0.1)O_(2)***,the synergistic influence of nanofiber morphology and enriched oxygen vacancy structure of fillers on electrochemical properties of composite GPEs is comprehensively investigated,thus,it is anticipated to shed new light on designing high-performance GPEs LMBs.

关键词： Nanofibers fillers Oxygen vacancies Gel polymer electrolytes Lithium metal batteries

Hyphae-mediated bioassembly of carbon fibers derivatives for advanced battery energy storage

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Carbon Energy 2024年第6期6卷 140-150页

作者： Lei Huang Zhong Qiu Ping Liu Xinhui Xia Feng Cao Xinping He chen Wang Wangjun Wan Yongqi Zhang Yang Xia Wenkui Zhang minghua chen Jiancang Zhou Department of Critical Care Medicine Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhouChina State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang ProvinceSchool of Materials Science&EngineeringZhejiang UniversityHangzhouChina College of Materials Science&Engineering Zhejiang University of TechnologyHangzhouChina State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhouChina Department of Engineering Technology Huzhou CollegeHuzhouChina Zhejiang Academy of Science and Technology for Inspection&Quarantine HangzhouZhejiangChina Institute of Fundamental and Frontier Science University of Electronic Science and Technology of ChinaChengduChina Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbinChina

Ingenious design and fabrication of advanced carbon-based sulfur cathodes are extremely important to the development of high-energy lithium-sulfur batteries,which hold promise as the next-generation power ***,for the first time,we report a novel versatile hyphae-mediated biological assembly technology to achieve scale production of hyphae carbon fibers(HCFs)derivatives,in which different components including carbon,metal compounds,and semiconductors can be homogeneously assembled with HCFs to form composite *** mechanism of biological adsorption assembly is also *** a representative,reduced graphene oxides(rGOs)decorated with hollow carbon spheres(HCSs)successfully co-assemble with HCFs to form HCSs@rGOs/HCFs hosts for sulfur *** this unique architecture,not only large accommodation space for sulfur but also restrained volume expansion and fast charge transport paths are ***,multiscale physical barriers plus chemisorption sites are simultaneously established to anchor soluble lithium ***,the designed HCSs@rGOs/HCFs-S cathodes deliver a high capacity(1189 mA h g^(-1)at 0.1 C)and good high-rate capability(686 mA h g^(-1)at 5 C).Our work provides a new approach for the preparation of high-performance carbon-based electrodes for energy storage devices.

关键词： bioassembly carbon fibers energy storage graphene lithium-sulfur batteries

Slaughter Performance, Muscle Quality and Nutritional Composition of Duoluo Goats in Sichuan Province

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Agricultural Biotechnology 2024年第2期13卷 12-16页

作者： Mingliang ZHOU Shan WU Qian PANG Basangzhuoma minghua chen Hualong FU Jinbin MAO Pinggui YANG Sichuan Academy of Grassland Sciences Chengdu 611731China Animal Husbandry Station of Ganzi Tibetan Autonomous Prefecture Kangding 626000China

[Objectives] This study was conducted to understand the biological characteristics of Duoluo goats. [Methods] With male and female Duoluo goats as the research object, related performance indexes were determined and analyzed after slaughter. [Results] The weights of one-year-old male and female Duoluo goats before slaughter were (25.68±2.37) and (24.51±1.97) kg, respectively;the dressing percentages were (43.55±3.24) % and (43.84±3.42) %, respectively;and the net meat percentages were (33.02±2.32) % and (34.19±2.46) %, respectively. (2) The cooked meat rates of male and female Duoluo goats were (65.49±1.42) % and (65.36±1.55) %, respectively;the shearing force was (5.48±1.24) and (5.65±1.02) N, respectively;and the loin-eye muscle areas were (8.95±1.72) and (8.82±1.15) cm 2, respectively. (3) The protein contents of male and female Duoluo goats were (20.07±0.42) and (19.47±1.22) g/100 g, respectively;and the fat contents were (1.30±0.80) % and (2.92±0.55) %, respectively;and the cholesterol contents were (71.76±11.47) and (74.83±2.68) mg/100 g, respectively;(4) The Ca contents of male and female Duoluo goats were (69.53±10.89) and (63.00±4.56) mg/kg, respectively;the Fe contents were (16.73±1.83) and (14.77±0.58) mg/kg, respectively;and the Zn contents were (38.47±3.68) and (31.83±2.22) mg/kg, respectively. (5) In the muscles of male and female Duoluo goats, the contents of essential amino acids were (7.44±0.24) and (7.26±0.41) g/100 g , respectively;the contents of non-essential amino acids were (11.81±0.33) and (11.42±0.67) g/100 g, respectively;and the contents of flavor amino acids were (8.79±0.27) and (8.42±0.57) g/100 g, respectively. [Conclusions] This study lays a foundation for the excavation and utilization of the resource, Duoluo goats.

关键词： Duoluo goat Slaughter Muscle quality Amino acid

基于光子学的线性调频微波信号产生技术进展(特邀)

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光学学报 2024年第15期44卷 507-521页

作者：邵帅杨四刚陈宏伟陈明华清华大学电子工程系北京100084 北京信息科学与技术国家研究中心北京100084

线性调频(LFM)信号以其具备大时间带宽积的优势已成为现代雷达系统中最为常用的波形之一。因受限于电子瓶颈,传统电学器件在产生高频、大带宽的信号方面已面临诸多挑战。相比之下,微波光子技术以其具有大可用带宽、低损耗、高灵活度等... 详细信息

线性调频(LFM)信号以其具备大时间带宽积的优势已成为现代雷达系统中最为常用的波形之一。因受限于电子瓶颈,传统电学器件在产生高频、大带宽的信号方面已面临诸多挑战。相比之下,微波光子技术以其具有大可用带宽、低损耗、高灵活度等优势现已成为最为可行的替代方案之一。本文首先综述了现有基于微波光子技术产生线性调频微波信号的方案,之后介绍了本课题组提出的一种基于锁相同步光源的信号产生方案。通过构建同步锁相环路实现了直流光源与扫频光源的实时锁定,拍频后实现了低相位噪声和高相参的信号产生。此外,本课题组所提出的信号产生方案还可实现中心频率、带宽和周期的灵活调节,产生的信号可以分别覆盖L至Ka波段。

关键词：微波光子学线性调频信号半导体激光器光锁相环

上海软土地层超深地下连续墙施工质量控制研究

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建设监理 2024年第1期 87-92,97页

作者：陈铭辉上海宏波工程咨询管理有限公司上海201707

正在建设的上海轨道交通市域线机场联络线,是联系上海综合交通枢纽(浦东机场和虹桥机场)的快速通道。其中,华泾站是目前上海轨道交通路网中最深的地下车站,采用超深地下连续墙作围护结构,而上海缺少软土层超深地下连续墙施工经验。为探... 详细信息

正在建设的上海轨道交通市域线机场联络线,是联系上海综合交通枢纽(浦东机场和虹桥机场)的快速通道。其中,华泾站是目前上海轨道交通路网中最深的地下车站,采用超深地下连续墙作围护结构,而上海缺少软土层超深地下连续墙施工经验。为探索超深地下连续墙施工经验和参数,对三幅1.2m厚、107.5率、泥浆指标、混凝土浇筑、超长钢筋笼连接质量等关键工序的施工质量和技术指标均达到预期目标。

关键词：上海轨道交通软土地层超深地下连续墙施工质量控制措施

贵阳市公共交通信息化“四网融合”研究与规划

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智慧轨道交通 2024年第5期61卷 95-98页

作者：陈明华贵阳市信捷科技有限公司贵州贵阳550081

通过对贵阳市公共交通投资运营集团有限公司(以下简称贵阳市交运集团)信息化系统运行现状的调查,对其存在的问题进行了分析,结合交通强国建设纲要、数字中国建设整体布局规划、贵州“强省会”五年行动、贵阳市综合交通体系规划(2021—2... 详细信息

通过对贵阳市公共交通投资运营集团有限公司(以下简称贵阳市交运集团)信息化系统运行现状的调查,对其存在的问题进行了分析,结合交通强国建设纲要、数字中国建设整体布局规划、贵州“强省会”五年行动、贵阳市综合交通体系规划(2021—2035年)的要求及市政府对集团公司“公司化、信息化、规范化、专业化”的发展要求,提出了贵阳市交运集团信息化建设规划应以企业重组、整合为契机,充分将轨道交通、道路公交、环城铁路、低运量轨道交通等信息进行融合互通,将贵阳市轨道交通线网城轨云平台升级为贵阳市公共交通云平台,全面构建贵阳市公共交通数智共享交通圈,从而实现贵阳市公共交通“四网融合”的高质量发展,对国内轨道交通和道路公交融合的发展进行引领和示范。

关键词：城轨云平台公共交通云平台数智共享生态圈四网融合

Optoelectronic convolutional neural networks based on time-stretch method

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Science China(Information Sciences) 2021年第2期64卷 180-191页

作者： Yubin ZANG minghua chen Sigang YANG Hongwei chen Beijing National Research Center for Information Science and Technology (BNRist) Department of Electronic EngineeringTsinghua University

In this paper, a new architecture of optoelectronic convolutional neural networks(CNNs) based on time-stretch method is proposed. In this loop-shaped structure mainly composed of fiber optical and electronic devices, computations of data from each layer of CNN which are carried by light pulses with high repetition rate can be accomplished in a serial way. Therefore, a 5-layer CNN with two convolution layers,two mean pooling layers and one fully-connected layer are implemented. Under the test of handwriting digit recognition, its accuracy can reach up to 95% under ideal circumstances. Tests under different relative noise levels have been conducted and analyzed as well.

关键词： convolutional neural networks time-stretch method artificial intelligence

中国数字普惠金融区域协同发展机制与路径研究——基于八大综合经济区视角

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财经论丛 2024年第5期 60-70页

作者：陈明华张腾文初勤儒史楠山东财经大学经济学院山东济南250014

在测度中国数字普惠金融发展水平基础上,采用Dagum基尼系数、方差分解和地理探测器方法从空间协同、结构协同及外在驱动因素三个方面考察我国数字普惠金融协同发展状况与协同机制,并据此探究我国数字普惠金融协同发展路径。研究发现:样... 详细信息

在测度中国数字普惠金融发展水平基础上,采用Dagum基尼系数、方差分解和地理探测器方法从空间协同、结构协同及外在驱动因素三个方面考察我国数字普惠金融协同发展状况与协同机制,并据此探究我国数字普惠金融协同发展路径。研究发现:样本期间全国整体及八大综合经济区数字普惠金融水平均呈上升态势,但地区间分异显著;区域间差异是阻碍数字普惠金融协同发展的主要空间来源;对于全国整体来说,覆盖广度差异是数字普惠金融发展不协同的主要结构来源,而在东部沿海、南部沿海、黄河中游等地区,使用深度差异超过覆盖广度差异成为影响区域内数字普惠金融发展不协同的主要结构来源;不论是在全国整体还是八大综合经济区,降低互联网覆盖差异和经济发展水平差异都是驱动数字普惠金融协同发展的主要因素,且每两对因素组合都会加强各自对数字普惠金融协同发展的影响。本文基于八大综合经济区视角,揭示了我国数字普惠金融发展的空间协同、结构协同和外在驱动机制,为探寻数字普惠金融协同发展路径提供有益借鉴。

关键词：数字普惠金融 Dagum基尼系数结构来源地理探测器

EFFICIENT NUMERICAL ALGORITHMS FOR THREE-DIMENSIONAL FRACTIONAL PARTIAL DIFFERENTIAL EQUATIONS

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Journal of Computational Mathematics 2014年第4期32卷 371-391页

作者： Weihua Deng minghua chen School of Mathematics and Statistics Lanzhou University Lanzhou 730000 China

This paper detailedly discusses the locally one-dimensional numerical methods for ef- ficiently solving the three-dimensional fractional partial differential equations, including fractional advection diffusion equation and Riesz fractional diffusion equation. The second order finite difference scheme is used to discretize the space fractional derivative and the Crank-Nicolson procedure to the time derivative. We theoretically prove and numerically verify that the presented numerical methods are unconditionally stable and second order convergent in both space and time directions. In particular, for the Riesz fractional dif- fusion equation, the idea of reducing the splitting error is used to further improve the algorithm, and the unconditional stability and convergency are also strictly proved and numerically verified for the improved scheme.

关键词： Fractional partial differential equations Numerical stability Locally one dimensional method Crank-Nicolson procedure Alternating direction implicit method.