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Enhancing zinc-air battery performance by constructing threedimensional N-doped carbon coating multiple valence Co and MnO heterostructures

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Nano Research 2024年第6期17卷 5104-5113页

作者： Qi Liu Panzhe Qiao Miaomiao Tong Ying Xie Xinxin Zhang kuo Lin Zhijian liang Lei Wang Honggang Fu Key Laboratory of Superlight Materials and Surface Technology of the Ministry of Education of the People’s Republic of China Harbin Engineering UniversityHarbin 150080China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China Heilongjiang UniversityHarbin 150080China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China

Developing highly-efficient bifunctional oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)electrocatalysts is crucial for the widespread application of rechargeable Zn-air batteries(ZABs).Herein,an efficiency electrodeposition and pyrolytic strategy to synthesize the three-dimensional(3D)N-doped carbon coating multiple valence Co and MnO heterostructures supported on carbon cloth substrate(Co-MnO@NC/CC).It contains Co-Co,Co-N,and Co-O bonds,which synergistically enhance the oxygen reaction activity with *** exhibits a working potential of 1.473 V at 10 mA·cm^(−2)for OER and onset potential of 0.97 V for *** calculations demonstrate that the synergy between cobalt and manganese species could optimize the d-band center and reduce the energy barrier of Co-MnO@NC/CC for both OER and ORR ***,the MnO acts as the main OER active site could significantly optimize the energy barrier of O*→OOH*,thus further promoting the OER *** can be directly used as the air-cathode for both liquid-state and solid-state ZABs,which could afford a small voltage gap of 0.75 V at 10 mA·cm^(−2),a high power density of 172.5 mW·cm^(−2)and a long-term durability for 400 h,surpassing those of the Pt/C+RuO_(2)-based ***,the assembled batteries show potential applications in portable devices.

关键词： heterostructure synergy valence cobalt manganese oxide Zn-air battery

基于聚类分析的土壤重金属分体式LIBS检测方法研究

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光谱学与光谱分析 2024年第9期44卷 2506-2513页

作者：关丛荣梁帅陈吉文王占扩北方工业大学北京100144

土壤是人类赖以生存的物质基础,它的特性与人们的生产生活密切相关,传统土壤重金属检测方法如原子吸收光谱法、电感耦合等离子体质谱法分析能力较弱且价格昂贵,因此亟需一种开发低成本易操作的土壤多种元素同时定量分析方法。激光诱导... 详细信息

土壤是人类赖以生存的物质基础,它的特性与人们的生产生活密切相关,传统土壤重金属检测方法如原子吸收光谱法、电感耦合等离子体质谱法分析能力较弱且价格昂贵,因此亟需一种开发低成本易操作的土壤多种元素同时定量分析方法。激光诱导击穿光谱(LIBS)技术因其分析快速、多元素同时分析等优点被广泛关注,但由于其体积较大不便于携带并且大多应用于实验室分析,为了满足现场检测的需求,研制了一台分体式现场LIBS检测仪,其设计是将仪器分为探测头和机箱两部分并通过包塑管进行连接,采用微型二极管泵浦激光器,脉冲能量可达100mJ,波长1064nm,重复频率为1~10Hz;此外采用多通道高分辨率光谱仪,提高LIBS的分析性能;为了减小辐射背景干扰,利用FPGA实现μs级延迟时间功能。对其应用在11种土壤获取光谱数据,实验设置脉冲能量为100mJ,延迟时间设为1μs,积分时间2ms,每个样品采集10个不同位置的光谱,每个位置测量20次,共采集200个光谱数据,为减少噪声干扰,对每个样品的光谱数据进行均值预处理后再进行Beads算法基线校正,利用PCA主成分分析得到贡献率最大的3个主成分分量,再通过Kmeans++算法对不同地区不同类型的11种土壤进行聚类分析,将相同类别的土壤代入偏最小二乘(PLSR)算法,每个元素选取两个特征谱线以及上下各10个点来增强光谱信息,选择一种样品作为预测对Cu、Cr、Ni、Co、Cd五种土壤重金属元素进行定量分析。结果表明,与未进行聚类分析相比,此方法可明显提高元素的拟合相关系数,五种重金属元素的相关系数分别从0.953、0.992、0.989、0.982、0.99提高至0.999、0.998、0.9995、0.9965、0.993,相关系数均达到0.99及以上满足LIBS线性分析要求,其预测结果与实际含量之间的平均相对误差分别从83.45%、16.03%、22.94%、43.91%、125.768%提高至1.14%、0.99%、0.895%、1.879%、1.862%,可以发现经过聚类分析后,其预测误差大大降低,均在5%以内,具有较好的分析性能,五种元素的相关系数和预测误差相比于直接进行PLSR方法均有提升。PCA与Kmeans++结合的方法能够更准确的进行聚类,在降维后进行聚类可以减少噪声和冗余信息的影响,加快计算速度,减少异常点对聚类效果的影响提高鲁棒性。

关键词：土壤聚类分析偏最小二乘法激光诱导击穿光谱

Chen Nianzu,pioneer of medical popularization

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Journal of Traditional Chinese Medical Sciences 2024年第1期11卷 1-2页

作者： Yongxuan liang Yinghua Huang Beijing University of Chinese Medicine Beijing 100029China

Chen Nianzu,also known as Chen Xiuyuan and Chen Shengxiu(1573—1823)was from the Mei Village,Changle Xi,Fujian *** was a distinguished traditional Chinese medicine(TCM)theorist,clinician and educator of the Qing Dynasty and the author of the Three-Character Primer of Medicine(Yi Xue San Zi Jing),Versified Currrent Formulas(Shi Fang Ge kuo),Briefly Annotated Treatise on Cold-induced Diseases(Shang Han Lun Qian Zhu),and Briefly Annotated Essentials fromthe Golden Cabinet(Jin Kui Yao Lue Qian Zhu),etc.

关键词： Province. Golden pioneer

基于磁性隧道结和双组分多铁纳磁体的超低功耗磁弹模数转换器

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物理学报 2024年第13期73卷 301-308页

作者：夏永顺杨晓阔豆树清崔焕卿危波梁卜嘉闫旭空军工程大学基础部西安710051

本文提出了一种由8个磁性隧道结(magnetic tunnel junction,MTJ)构成的3位磁弹模数转换器(magnetoelastic analog-to-digital converter,MEADC),该转换器中MTJ自由层为双组分多铁纳磁体.通过对多铁纳磁体实施应变介导的电压调控,可以实... 详细信息

本文提出了一种由8个磁性隧道结(magnetic tunnel junction,MTJ)构成的3位磁弹模数转换器(magnetoelastic analog-to-digital converter,MEADC),该转换器中MTJ自由层为双组分多铁纳磁体.通过对多铁纳磁体实施应变介导的电压调控,可以实现零场条件下的确定性磁化翻转.研究发现:对于给定尺寸,给定材料的双组分多铁纳磁体,压电层厚度与双组分多铁纳磁体的临界翻转电压线性相关.基于该原理,通过调整压电层的厚度使得MEADC具有8个不同的电压切换阈值,将模拟信号转换为8个多铁MTJ不同磁化状态组合.同时,设计了锁存比较器和独立的读取电路来检测MTJ的阻态,以此实现了数字信号的输出.Monte Carlo功能模拟表明:该MEADC在室温下写入成功率可达100%;此外,读写电路相互分离,使得压电层厚度与MTJ的输出参考电压无关,因此每个MTJ可设置相同的参考电压,从而具有更高的读取可靠性.微磁仿真和数值模拟分析发现:该MEADC的工作频率可达250 MHz,单次转换能耗仅为20 aJ;与基于Racetr ack技术的磁模数转换器相比,能耗降低了1000倍,采样速率提高了10倍.本文提出的MEADC可为基于自旋电子器件的存算一体电路架构提供重要的技术支撑.

关键词：磁弹模数转换器磁性隧道结自旋电子学纳磁体

实践能力驱动下的工程硕士研究生培养模式研究

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印刷与数字媒体技术研究 2024年第3期 81-88页

作者：杨乐王正松何大阔赵玉良东北大学秦皇岛分校控制工程学院秦皇岛066004 东北大学信息科学与工程学院沈阳110819

学术学位与专业学位研究生的分类培养是高等教育回应社会多元化需求的必然选择,有助于精准对接国家对不同类型高层次人才的需求,提升研究生教育的整体质量和效益。本文通过深入分析两类研究生培养在定位、内容、过程及评价等方面的差异... 详细信息

学术学位与专业学位研究生的分类培养是高等教育回应社会多元化需求的必然选择,有助于精准对接国家对不同类型高层次人才的需求,提升研究生教育的整体质量和效益。本文通过深入分析两类研究生培养在定位、内容、过程及评价等方面的差异,揭示培养过程中同质化问题产生的原因,提出以实践能力为核心,融合课程体系、实践教学及产、学、研协同的创新培养模式,以培育具备独立思考和解决实际问题能力的专业人才。为保障培养模式的顺利实施,构建涵盖立德树人、需求导向、开放办学、分类深化及质量监控等维度的工程硕士研究生培养路径。本文旨在为解决两类研究生培养模式的趋同现象提供新思路,为提升工程硕士研究生的实践能力提供参考。

关键词：工程硕士研究生实践能力分类培养

The study of the effect of gas-phase fluctuation on slag flow and refractory brick corrosion in the slag tapping hole of an entrained-flow gasifier

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Chinese Journal of Chemical Engineering 2022年第7期35卷 271-281页

作者： kuo Lin Zhongjie Shen Qinfeng liang Jianliang Xu Haifeng Liu Shanghai Engineering Research Center of Coal Gasification East China University of Science and TechnologyShanghai 200237China Institute of Clean Coal Technology East China University of Science and TechnologyShanghai 200237China

The service life of refractory brick in the slag tapping hole of the entrained flow gasifier was significantly lower than that in other *** was critically important to study the corrosion mechanism of refractory brick in the slag tapping hole for guiding industrial *** the complex flow field in the slag tapping hole,the influence of gas velocity and temperature fluctuation on the service life of refractory brick was investigated in this *** results showed that the slag flow characteristics periodically changed with the gas temperature and velocity *** brick corrosion rate increased with the decrease of fluctuation *** with the gas-phase velocity fluctuation,the gasphase temperature fluctuation had a more significant influence on the brick corrosion *** the fluctuation frequency was 0.01 Hz and the gas temperature fluctuation amplitude was 200 K,the corrosion rate of refractory bricks increased by 25%.It could be concluded that the fluctuation of gas-phase temperature was the main cause for the low service life of refractory bricks in the tapping hole.

关键词： Gasification Brick corrosion Dynamic response Slag flow Heat transfer

Highly Transparent and Adhesive Poly(vinylidene difluoride)Films for Self-Powered Piezoelectric Touch Sensors

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Chinese Journal of Polymer Science 2022年第7期40卷 726-737页

作者： Qing-Qing Li Guang-kuo Wang Zi-Xu liang Zhi-Jun Hu School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou215006China Center for Soft Condensed Matter Physics and Interdisciplinary Research Soochow UniversitySuzhou215006China Soochow University Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of ChinaSuzhou215006China

With the rapid development of internet of things,self-powered touch sensors made of piezoelectric fluorinated polymers have attracted significant interest because they can constantly convert mechanical energy into electrical energy without external power ***,it is still challenging to fabricate fluorinated polymer films with good adhesion and high output performance with a large-scale and low-cost method while maintaining high transparency,which are extremely important for simultaneous optical detection and electromechanical *** this work,we demonstrate that the incorporation of a molecular ferroelectric-dabcoHReO_(4)(DH)into poly(vinylidene difluoride)(PVDF)solution enables high-throughput and low-temperature processing of flexible and transparent piezoelectric films by scalable processing *** effects of multiaxial DH are ***,DH can trigger the phase transition of PVDF fromα-toβ-phase and realize the orderly orientation of PVDF,which guarantees higher piezoelectric performance without any additional electrical poling ***,the hydrophilic nature of DH can improve the adhesion properties of PVDF,which in turn improve the stability and durability of the *** optimizing the fabrication processes,the transmittance of the piezoelectric touch sensors based on PVDF films and Ag nanowires coated poly(ethylene terephthalate)electrodes can be higher than 94%.The piezoelectric voltage constant g;of the transparent films can reach to 1.2 V·m·N;,which is at least three times higher than the commercially available PVDF films obtained by *** results indicate that the flexible piezoelectric sensors have potential applications in transparent electronic devices for mechanical sensing and energy harvesting.

关键词： PVDF Transparent Adhesive Large scale Piezoelectric sensor

轻度抑郁障碍患者五音疗法治疗前后脑改变的磁共振成像研究

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中国医药科学 2024年第13期14卷 137-141,185页

作者：佟靖雯魏景洋王阔梁爽牡丹江医学院医学影像学院黑龙江牡丹江157000 牡丹江医学院附属第二医院影像科黑龙江牡丹江157000

目的基于多模态磁共振评估五音疗法治疗轻度抑郁障碍患者治疗前后的脑改变。方法纳入自2021年1月至2022年6月精神心理科就诊的轻度抑郁障碍患者250例,按照随机数表法分为试验组200例,对照组50例。试验组给予为期8周的五音疗法治疗干预,... 详细信息

目的基于多模态磁共振评估五音疗法治疗轻度抑郁障碍患者治疗前后的脑改变。方法纳入自2021年1月至2022年6月精神心理科就诊的轻度抑郁障碍患者250例,按照随机数表法分为试验组200例,对照组50例。试验组给予为期8周的五音疗法治疗干预,对照组仅常规随访。通过比较两组患者治疗前后心理学量表差异判定五音疗法疗效。比较两组全脑结构、差异脑区及相应脑区弥散张量成像各向异性分数(FA)值的变化,表征五音疗法治疗有效的轻度抑郁障碍患者的特异性脑改变。结果试验组经五音疗法治疗后17项汉密尔顿抑郁评分标准(HAMD)和汉密尔顿焦虑量表(HAMA)评分减低,差异有统计学意义(P0.05)。结论五音疗法对于轻度抑郁障碍患者的治疗效果显著,并存在不同脑区的特异性改变,多模态磁共振可以用作为表征抑郁障碍患者脑改变的神经影像学工具,为临床诊断及评估抑郁障碍提供定量影像学支持。

关键词：多模态磁共振成像轻度抑郁五音疗法脑结构

Bioinspired Nanostructured Superwetting Thin-Films in a Self-supported form Enabled“Miniature Umbrella”for Weather Monitoring and Water Rescue

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Nano-Micro Letters 2022年第2期14卷 174-189页

作者： Shan Li Peng Xiao Wei Zhou Yun liang Shiao-Wei kuo Tao Chen Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201People’s Republic of China School of Chemical Sciences University of Chinese Academy of Sciences19A Yuquan RoadBeijing 100049People’s Republic of China Department of Material and Optoelectronic Science National Sun Yat-Sen UniversityKaohsiung 804TaiwanPeople’s Republic of China

Two-dimensional(2D)soft materials,especially in their self-supported forms,demonstrate attractive properties to realize biomimetic morphing and ultrasensitive *** extensive efforts on design of self-supported functional membranes and integrated systems have been devoted,there still remains an unexplored regime of the combination of mechanical,electrical and surface wetting properties for specific ***,we report a self-supported film featured with elastic,thin,conductive and superhydrophobic *** a well-defined surface modification strategy,the surface wettability and mechanical sensing can be effectively *** resulted film can function as a smart umbrella to achieve real-time simulated raining with diverse frequencies and *** addition,the integrated umbrella can even response sensitively to the sunlight and demonstrate a positively correlation of current signals with the intensity of sun ***,the superhydrophobic umbrella can be further employed to realize water rescue,which can take the underwater object onto water surface,load and rapidly transport the considerable *** importantly,the whole process of loaded objects and water flow velocity can be precisely *** self-supported smart umbrella can effectively monitor the weather and realize a smart water rescue,demonstrating significant potentials in multifunctional sensing and directional actuation in the presence of water.

关键词： Self-supported Superhydrophobic thin films Multifunctional sensing Water rescue