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Cu含量对Ag/LSCO电接触材料物理性能的影响

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贵金属 2024年第1期45卷 15-22页

作者：王大帅曹旭丹杨芳儿郑晓华浙江工业大学材料科学与工程学院杭州310014 浙江大学材料科学与工程学院杭州310027

采用溶胶凝胶法辅以高能球磨工艺合成Cu粉体改性La_(0.5)Sr_(0.5)CoO_(3-δ)(LSCO)粉体,用粉末冶金工艺结合热挤压技术制备了系列Cu改性Ag/LSCO电接触材料与成品丝,研究了Cu粉体对改性Ag/LSCO材料界面润湿性、物理力学性能等影响规律。... 详细信息

采用溶胶凝胶法辅以高能球磨工艺合成Cu粉体改性La_(0.5)Sr_(0.5)CoO_(3-δ)(LSCO)粉体,用粉末冶金工艺结合热挤压技术制备了系列Cu改性Ag/LSCO电接触材料与成品丝,研究了Cu粉体对改性Ag/LSCO材料界面润湿性、物理力学性能等影响规律。结果表明,随着Cu含量的增加,改性Ag/LSCO-xCu(x=0、1、2、4、6、8)电接触材料的电阻率呈先增加后减小的趋势,与Ag和LSCO基底的润湿角变化趋势相一致,但其密度和硬度性能变化趋势相反;当Cu含量为4%时,Ag和LSCO-4Cu基底的润湿角达最小值55.0°,相应的成品丝(φ2.35mm)性能最佳:电阻率2.29μΩ·cm,硬度(HV^(0.3))946.7MPa,密度9.73g/cm^(3),断后延伸率3.9%,为纯Ag/LSCO的3.9倍。

关键词：电接触材料 Ag/LSCO Cu改性物理性能润湿角

Accelerated prediction of Cu-based single-atom alloy catalysts for CO_(2) reduction by machine learning

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Green Energy & Environment 2023年第3期8卷 820-830页

作者： dashuai wang Runfeng Cao Shaogang Hao Chen Liang Guangyong Chen Pengfei Chen Yang Li Xiaolong Zou Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute&Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen518055China Tencent Shenzhen518054China Shenzhen Key Laboratory of Virtual Reality and Human Interaction Technology Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong Kong999077China Tsinghua-Berkeley Shenzhen Institute Tsinghua UniversityShenzhen518055China

Various strategies,including controls of morphology,oxidation state,defect,and doping,have been developed to improve the performance of Cu-based catalysts for CO_(2) reduction reaction(CO_(2)RR),generating a large amount of ***,a unified understanding of underlying mechanism for further optimization is still *** this work,combining first-principles calculations and machine learning(ML)techniques,we elucidate critical factors influencing the catalytic properties,taking Cu-based single atom alloys(SAAs)as *** method relies on high-throughput calculations of 2669 CO adsorption configurations on 43 types of Cu-based SAAs with various *** ML analyses reveal that low generalized coordination numbers and valence electron number are key features to determine catalytic *** our ML model with cross-group learning scheme,we demonstrate the model generalizes well between Cu-based SAAs with different alloying ***,electronic structure calculations suggest surface negative center could enhance CO adsorption by back donating electrons to antibonding orbitals of ***,several SAAs,including PCu,AgCu,GaCu,ZnCu,SnCu,GeCu,InCu,and SiCu,are identified as promising CO_(2)RR *** work provides a paradigm for the rational design and fast screening of SAAs for various electrocatalytic reactions.

关键词： Cu-based single-atom alloy CO adsorption Machine learning First principles CO_(2)reduction reaction

Stable and dendrite-free Zn anode with artificial desolvation interface layer toward high-performance Zn-ion capacitor

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Journal of Energy Chemistry 2022年第9期31卷 143-148,I0005页

作者： Zhe Gong Kai Jiang Pengfei wang Xunliang Liu dashuai wang Ke Ye Kai Zhu Jun Yan Guiling wang Dianxue Cao Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001HeilongjiangChina School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityHong Kong 999077China Senzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute&Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina Key Laboratory of Polymer and Catalyst Synthesis Technology of Liaoning Province School of Environmental and Chemical EngineeringShenyang University of TechnologyShenyang 110870LiaoningChina

Aqueous Zn-based energy storage devices possess tremendous advantages, such as low cost, high safety,and competitive energy density, due to employing a Zn metal anode and aqueous electrolyte. However,the cycling stability and rate ability of a Zn anode are hindered by Zn dendrite growth and sluggish ion transfer in the electrode/electrolyte interface. Herein, the interfacial properties of Zn anodes are improved through the introduction of a silver(Ag) protective layer, which facilitates uniform Zn deposition and regulates Zn ion transport. As a result, Ag-coated Zn anodes display stable cycling performance(600 h at 1 m A cm^(-2)) and low overpotential(150 mV at 50 mA cm^(-2)after 2000 cycles). The Ag layer in situ electrochemically converts into an AgZn_(3) layer and promotes Zn ion desolvation and threedimensional diffusion processes. Moreover, a Zn-ion capacitor assembled with an Ag-coated Zn anode and active carbon cathode shows a capable cycling lifespan and rate performance. This study provides a feasible strategy for constructing a stabilized and dendrite-free Zn anode for the development of high-performance Zn-based energy storage devices.

关键词： Zn ion capacitors Zn metal anodes Aqueous electrolyte Dendrite-free surface

Ag/LaNi_(x)Co_(1-x)O_(3)触点材料的制备及电接触性能研究

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贵金属 2024年第2期45卷 19-25页

作者：邵紫阳杨芳儿王大帅刘振武沈涛李跃郑晓华浙江工业大学材料科学与工程学院杭州310014 浙江大学材料科学与工程学院杭州310058 浙江大学温州研究院浙江温州325036

本文运用溶胶-凝胶燃烧法合成了双钙钛矿型LaNi_(x)Co_(1-x)O_(3)(LNCO)纳米材料,利用粉末冶金和热挤压技术制备了相应的Ag/LNCO触点材料及元件样品。重点考察了不同Ni、Co含量对Ag/LNCO触点材料微观结构、物相组成、物理性能、力学性... 详细信息

本文运用溶胶-凝胶燃烧法合成了双钙钛矿型LaNi_(x)Co_(1-x)O_(3)(LNCO)纳米材料,利用粉末冶金和热挤压技术制备了相应的Ag/LNCO触点材料及元件样品。重点考察了不同Ni、Co含量对Ag/LNCO触点材料微观结构、物相组成、物理性能、力学性能及电寿命服役能力的影响,对其电弧侵蚀失效行为进行了研究,并与SnO2粉体增强Ag基触点材料进行对比。结果表明:溶胶凝胶法合成的LNCO纳米颗粒粒径为20-30 nm,经粉末冶金工艺制备的Ag/LaNi_(0.5)Co_(0.5)O_(3)触点材料电学性能和电寿命都优于Ag/SnO_(2)触点材料,其电阻率低至2.10μΩ∙cm,电寿命性能达到51287次。表明Ag/LaNi_(0.5)Co_(0.5)O_(3)触点材料性能较佳,是一种可以取代Ag/CdO的新型触点材料。

关键词：触点材料力学性能电弧侵蚀电寿命 La_(2)Ni_(1-x)Co_(x)O_(3)

Lactiplantibacillus plantarum DPUL-S164 regulate AhR signaling to ameliorate DSS-induced intestinal barrier damage by producing indole-3-lactic acid in a tryptophan-rich diet

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Food Science and Human Wellness 2024年

作者： Arong wang dashuai He Tieqi wang Cheng Guan Guangqing Mu Yanfeng Tuo School of Food Science and Technology， Dalian Polytechnic University Dalian Probiotics Function Research Key Laboratory， Dalian Polytechnic University

The aim of this paper was to study the effect of combination of Lactobacillus strains and tryptophan-rich diet on the intestinal barrier function of Balb/c mice exposed to a cocktail of antibiotics (ABX)and dextran sodium sulfate (DSS). Several Lactobacillus strains isolated from the healthy human fecal sample was found to utilize tryptophan(Trp) to produce indole derivatives. The results of Trp metabolism indicated that the ability of Lactobacillus to metabolize Trp to produce Indole-3-lactic Acid (ILA)， indole-3-carboxaldehyde (I3A)， and indole-3-acetic acid (IAA)varies in vitro and in vivo. The effect of Lactobacillus with high-yielding indole derivatives on disease activity index (DAI)， colon length， and intestinal permeability was significantly better than that of Lactobacillus with low-yielding indole derivatives in a high Trp diet. And Lactobacillus combined with Trp intervention also had a certain regulatory effect on the intestinal flora of male Balb/C mice. Among them， Lactiplantibacillus plantarum (L. plantarum) DPUL-S164 produced more ILA both in vivo and in vitro， and the combination of L. plantarum DPUL-S164 and Trp significantly decreased the expression level of the serum pro-inflammatory cytokine interleukin (IL)-6 and increased the expression level of the anti-inflammatory cytokine IL-10， significantly improved the number of goblet cells in the mouse mucous layer and increased mucin and tight junction protein expression. Furthermore， L. plantarum DPUL-S164 combined with Trp intervention activated the aryl hydrocarbon receptors (AhR) signaling pathway. Furthermore， we found that the expression of colonic tight junction protein was positively correlated with the expression of colonic AhR， and the expression of AhR was positively correlated with the concentrations of ILA and I3A in vivo. Therefore， we conclude that the ILA as AhR ligand produced by L. plantarum DPUL-S164 regulated the AhR pathway， thus up-regulating the expression of the tight junction

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亚里士多德对柏拉图理念论的批判性接纳——论《物理学》卷1章1中的一个“普遍”疑难

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现代哲学 2023年第2期 81-87页

作者：王大帅华侨大学哲学与社会发展学院暨生活哲学研究中心厦门361021

亚里士多德在其《物理学》卷1章1中提出了他著名的科学研究的方法论,即从对我们而言清晰明白的事物出发逐渐进入到就其自身而言清晰明白的事物。在阐发这一研究进路的同时,亚里士多德指出一切探索原因的科学研究都从某种“普遍之物”出... 详细信息

亚里士多德在其《物理学》卷1章1中提出了他著名的科学研究的方法论,即从对我们而言清晰明白的事物出发逐渐进入到就其自身而言清晰明白的事物。在阐发这一研究进路的同时,亚里士多德指出一切探索原因的科学研究都从某种“普遍之物”出发逐渐进入到个别的事物。这种观念将读者带入某种“普遍”疑难,因为它既不符合我们对科学研究以“普遍”为旨归的常识性认知,也无法与亚里士多德本人在其他文本中对“普遍”的相关论述相调和。通过分析亚里士多德对理念论的批判读者不难发现,亚里士多德此处对“普遍”的不寻常运用也许有其柏拉图的根源:亚里士多德将柏拉图意义上分离的、作为某种普遍之物的理念理解为是对事物实存的某种确认,并把它作为不可分离的属■或者本质属性■接纳到自己的体系中来,并视其为某种科学研究的起点。

关键词：亚里士多德科学 “普遍” 研究进路对理念论的批判

Structural Evolution of FeH4 in the Earth's inner core

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Structural Evolution of FeH4 in the Earth's inner core

第十八届中国高压科学学术会议

作者： Fei Li dashuai wang Henan Du Dan Zhou 刘艳辉 Department of Physics College of Science Yanbian University Laboratory of Clean Energy Technology Changchun University of Science and Technology

The solid inner core of earth is composed mainly of an iron-rich alloy with nickle and some lighter elements like hydrogen,but the exact compositions are not ***,we systematically investigate the high-pressure phase transitions of Fe H4 in the pressure range of 86-400 GPa by using a first-principles structural *** calculations reveal three novel structures,which is transfers from the insulatedα-phase to high-pressure metallicβ-phase,and then to a weak metallicγ-*** calculated formation enthalpies of Fe H4 relative to the decomposition into the constituents of Fe H3 and H2 shown that energetically Fe H4 are calculated to be stable above 200 ***,we find superconducting state in theβ-phase with a transition temperature of 1.7 K at 200 *** results are useful to investigate the stable phase and equation of state in Fe-H system relevant to the Earth’s core.

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海洋弱湍流条件下光孤子脉冲通信性能

中国激光 2018年第5期45卷 186-193页

作者：王阳张鹏李晓燕王超王大帅佟首峰长春理工大学空间光电技术国家与地方联合工程研究中心吉林长春130022 长春理工大学光电工程学院长春吉林130022

为降低海洋湍流对水下光通信系统链路性能的影响,将光孤子脉冲应用于水下通信。假定水下通信系统采用开关键控调制,信道采用描述海洋弱湍流的Lognormal模型,推导出了海洋闪烁系数的具体表达式和含形状因子和闪烁系数的通信误码率表达式... 详细信息

为降低海洋湍流对水下光通信系统链路性能的影响,将光孤子脉冲应用于水下通信。假定水下通信系统采用开关键控调制,信道采用描述海洋弱湍流的Lognormal模型,推导出了海洋闪烁系数的具体表达式和含形状因子和闪烁系数的通信误码率表达式,仿真分析了不同湍流强度、海洋湍流参数下光孤子、矩形、高斯脉冲光束的通信误码率,最后从脉冲时域角度对比研究三种脉冲光束。结果表明:随着湍流强度的变化,信噪比为5dB时,光孤子脉冲的误码率比高斯型和矩形脉冲的误码率低至少3个数量级。接收孔径和温度与盐度波动对海洋光学湍流贡献的比值是对水下通信误码率影响较灵敏的因素;随着海洋湍流影响因素的变化,光孤子脉冲抵抗外界环境的能力强于其他脉冲,其误码率始终小于高斯和矩形误码率。光孤子时域展宽比高斯、矩形展宽小,但随着距离的增加,三种脉冲展宽趋于一致。仿真结果验证了光孤子脉冲用于水下通信的优势,可为下一步研究提供理论参考。

关键词：光通信光孤子闪烁系数误码率脉冲展宽海洋湍流

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兰新高铁沿线插板式挡沙墙防沙性能研究

铁道标准设计 2022年第4期66卷 74-79页

作者：王大帅耿文燕石龙郑州铁路职业技术学院郑州450052 河南省高速铁路运营维护工程研究中心郑州451460 西南交通大学土木工程学院成都610031

为保障兰新高铁风沙路段的列车安全运营,铁路沿线大范围安装了插板式挡沙墙,由于缺乏系统的研究,导致挡沙墙一些防沙性能还未完全掌握。结合数值模拟和风洞试验,对插板式挡沙墙的防沙性能进行系统分析,并探讨孔隙率、积沙量对其影响。... 详细信息

为保障兰新高铁风沙路段的列车安全运营,铁路沿线大范围安装了插板式挡沙墙,由于缺乏系统的研究,导致挡沙墙一些防沙性能还未完全掌握。结合数值模拟和风洞试验,对插板式挡沙墙的防沙性能进行系统分析,并探讨孔隙率、积沙量对其影响。研究结果表明:插板式挡沙墙高效防沙区顺风向主要集中在迎风侧2H至背风侧7.5H范围内,垂直方向主要集中在高度0.6H以下(H为挡沙墙高度);随着环境风速和距地表高度的增大,插板式挡沙墙的阻沙性能呈递减趋势;孔隙率越大,插板式挡沙墙背风侧循环泡尺寸越小,对气流扰动的能力越强,但其扰动范围越小,综合考虑孔隙率取20%左右比较合理;插板式挡沙墙周围的风积沙越多,其防沙效果越差,为保证挡沙墙高效的工作,有必要及时清理其周围的风积沙。

关键词：兰新高铁插板式挡沙墙数值模拟风洞试验防沙性能