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Synergistic effect of V and Fe in Ni/Fe/V ternary layered double hydroxides for efficient and durable

《化学科学与工程前沿（英文）》 2023年 第17卷 第1期   页码 102-115 doi: 10.1007/s11705-022-2179-6

摘要： High-performance and stable electrocatalysts are vital for the oxygen evolution reaction (OER). Herein, via a one-pot hydrothermal method, Ni/Fe/V ternary layered double hydroxides (NiFeV-LDH) derived from Ni foam are fabricated to work as highly active and durable electrocatalysts for OER. By changing the feeding ratio of Fe and V salts, the prepared ternary hydroxides were optimized. At an Fe:V ratio of 0.5:0.5, NiFeV-LDH exhibits outstanding OER activity superior to that of the binary hydroxides, requiring overpotentials of 269 and 274 mV at 50 mA·cm–2 in the linear sweep voltammetry and sampled current voltammetry measurements, respectively. Importantly, NiFeV-LDH shows extraordinary long-term stability (≥ 75 h) at an extremely high current density of 200 mA·cm–2. In contrast, the binary hydroxides present quick decay at 200 mA·cm–2 or even reduced current densities (150 and 100 mA·cm–2). The outstanding OER performance of NiFeV-LDH benefits from the synergistic effect of V and Fe while doping the third metal into bimetallic hydroxide layers: (a) Fe plays a crucial role as the active site; (b) electron-withdrawing V stabilizes the high valence state of Fe, thus accelerating the OER process; (c) V further offers great stabilization for the formed intermediate of FeOOH, thus achieving superior durability.

关键词： oxygen evolution reaction     electrocatalysts     ternary layered double hydroxides     long-term stability    

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Crystallographic orientation effect on cutting-based single atomic layer removal

Wenkun XIE, Fengzhou FANG

《机械工程前沿（英文）》 2020年 第15卷 第4期   页码 631-644 doi: 10.1007/s11465-020-0599-x

摘要： The ever-increasing requirements for the scalable manufacturing of atomic-scale devices emphasize the significance of developing atomic-scale manufacturing technology. The mechanism of a single atomic layer removal in cutting is the key basic theoretical foundation for atomic-scale mechanical cutting. Material anisotropy is among the key decisive factors that could not be neglected in cutting at such a scale. In the present study, the crystallographic orientation effect on the cutting-based single atomic layer removal of monocrystalline copper is investigated by molecular dynamics simulation. When undeformed chip thickness is in the atomic scale, two kinds of single atomic layer removal mechanisms exist in cutting-based single atomic layer removal, namely, dislocation motion and extrusion, due to the differing atomic structures on different crystallographic planes. On close-packed crystallographic plane, the material removal is dominated by the shear stress-driven dislocation motion, whereas on non-close packed crystallographic planes, extrusion-dominated material removal dominates. To obtain an atomic, defect-free processed surface, the cutting needs to be conducted on the close-packed crystallographic planes of monocrystalline copper.

关键词： ACSM     single atomic layer removal mechanism     crystallographic orientation effect     mechanical cutting     Manufacturing III    

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New branched benign compounds including double antibiotic scaffolds: synthesis, simulation and adsorptionfor anticorrosion effect on mild steel

《化学科学与工程前沿（英文）》 2023年 第17卷 第2期   页码 167-182 doi: 10.1007/s11705-022-2199-2

摘要： In this study, two novel environmental benign double antibiotic norfloxacin or ciprofloxacin scaffolds included branched molecules were prepared by multi-step routes and purified by simple performance, which were used as the target compounds (TCs). Meanwhile, a single norfloxacin or ciprofloxacin skeleton based molecules were synthesized as the reference compounds (RCs). The molecular geometry optimization and material simulation computation revealed that TCs presented smaller HOMO-LUMO energy gaps and larger binding energy levels on mild steel surface than RCs. The chemical adsorption of TCs on steel surface was confirmed by X-ray photoelectron spectroscopy, which could be processed by TCs chelation with iron ions. It was shown that TCs could be self-adsorbed on steel surface, which was demonstrated by atomic force microscopy and scanning electron microscopy. The anticorrosion of the studied compounds for mild steel in HCl solution was investigated by electrochemistry analysis. The results suggested that the anticorrosion efficiency could reach 95.86% (TC1) and 97.05% (TC2) at 0.050 mmol·L−1 based on electrochemical impedance spectroscopy, which were much better than RCs (RC1, 69.23%; RC2, 74.16%). The adsorption isotherms of TCs on steel were further fitted, and a deep insight on adsorption was discussed.

关键词： branched compounds     floxacin scaffold     mild steel     anticorrosion     environmentally benign    

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Theoretical analysis of novel weak current sensor using FeCuNbSiB single nanocrystalline toroidal coreand double-winding

BAO Bing-hao, ZHU Da-qi, DING Jian-ning, LI Chang-sheng

《机械工程前沿（英文）》 2006年 第1卷 第4期   页码 439-442 doi: 10.1007/s11465-006-0054-7

摘要： An FeCuNbSiB nanocrystalline toroidal core made by isothermal furnace annealing shows good thermal stability of magnetic properties and excellent soft magnetic properties due to the full release of the internal stresses of the core during the annealing process. Based on the feature of the magnetic core, a novel non-contact type weak current sensor adopting single nanocrystalline core and double-winding excited by multivibrator bridge is proposed. The measuring principles for static current are given in theory by an established mathematical model of the sensor. The theory is in good agreement with the experimental results and it indicated clearly the key factors affecting performance parameters for the sensor. The multivibrator bridge output signal was analyzed by Fourier transform. Furthermore, according to the theoretical results, the method to design the signal conditioning circuit was introduced.

关键词： measuring     mathematical     Furthermore     transform     FeCuNbSiB nanocrystalline    

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Influence of HS and NH on biogas dry reforming using Ni catalyst: a study on single and synergetic effect

《环境科学与工程前沿（英文）》 2023年 第17卷 第3期 doi: 10.1007/s11783-023-1632-1

摘要：

● NH3 in biogas had a slight inhibitory effect on dry reforming.

关键词： Biogas     Dry reforming     Sulfur poisoning     Ammonia     Synergetic effect     Hydrogen    

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A new method of studying collapsibility of loess

Yuanqing ZHU , Zhenghan CHEN ,

《结构与土木工程前沿（英文）》 2009年 第3卷 第3期   页码 305-311 doi: 10.1007/s11709-009-0040-3

摘要： A new triaxial testing system that could control suction in wetting-induced collapsible tests was successfully developed to study the suction effects on wetting-induced collapsible deformation. The pedestal of the triaxial cell was made up of two parts, and the equipment not only could control suction but also could make water accessible to soil. A pressure/volume-controlled equipment was combined with the triaxial system to measure the water volume absorbed by samples accurately and to add pressure on water to filtrate into the sample. The apparatus could measure volume change precisely and keep the deviator stress unvaried, as well as measure the volume of water filtrating into the samples exactly. A triaxial collapsible testing procedure was described using the new apparatus for undisturbed collapsible loess with controlled suction. Furthermore, a series of double triaxial collapsible tests were conducted under different suctions and the same net cell pressure, and tests under different net cell pressures and the same suction were also done. It was indicated that the collapsible deformation increased with the increasing suction, and the effect of the net cell pressure on collapsible deformation was remarkable. The new triaxial apparatus was a useful facility to study the collapsible behavior of loess.

关键词： triaxial apparatus for collapsible soils     controlled suction     pressure/volume controlled equipment     double triaxial collapsible test     single triaxial collapsible test    

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analysis and optimization of 1,3-dimethylimidazolylium dimethylphosphate-water binary mixture for a singleeffect absorption refrigeration system

Gorakshnath TAKALKAR, Ahmad K. SLEITI

《能源前沿（英文）》 2022年 第16卷 第3期   页码 521-535 doi: 10.1007/s11708-021-0720-9

摘要： The energy and exergy analyses of the absorption refrigeration system (ARS) using H O-[mmim][DMP] mixture were investigated for a wide range of temperature. The equilibrium Dühring ( - - ) and enthalpy ( - - ) of mixture were assessed using the excess Gibbs free non-random two liquid (NRTL) model for a temperature range of 20°C to 140°C and from 0.1 to 0.9. The performance validation of the ARS cycle showed a better coefficient of performance (COP) of 0.834 for H O-[mmim][DMP] in comparison to NH -H O, H O-LiBr, H O-[emim][DMP], and H O-[emim][BF4]. Further, ARS performances with various operating temperatures of the absorber ( ), condenser ( ), generator ( ), and evaporator ( ) were simulated and optimized for a maximum COP and exergetic COP (ECOP). The effects of from 50°C to 150°C and and from 30°C to 50°C on COP and ECOP, the , , and circulation ratio (CR) of the ARS were evaluated and optimized for from 5°C to 15°C. The optimization revealed that needed to achieve a maximum COP which was more than that for a maximum ECOP. Therefore, this investigation provides criteria to select low grade heat source temperature. Most of the series flow of the cases of cooling water from the condenser to the absorber was found to be better than the absorber to the condenser.

关键词： ionic liquid driven absorption cycle     H2O-[mmim][DMP]     coefficient of performance (COP)     exergy analysis     thermodynamics mixture property    

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玻璃纤维复合材料新生态复合技术

回显权

《中国工程科学》 2002年 第4卷 第4期   页码 93-94

摘要：

现代结构材料正向复合化方向发展。复合材料发展的关键在于开创低成本、高可靠性的复合技术。 将玻璃纤维复合材料由传统的后期复合改为新生态的早期复合，可降低复合成本和提高可靠性。

关键词： 复合材料     早期复合     单纤维复合     纤维力学效应     界面效应     树脂薄膜效应    

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The effect of hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios on its pore structure

Yuexin Hou, Xiaoyun Li, Minghui Sun, Chaofan Li, Syed ul Hasnain Bakhtiar, Kunhao Lei, Shen Yu, Zhao Wang, Zhiyi Hu, Lihua Chen, Bao-Lian Su

《化学科学与工程前沿（英文）》 2021年 第15卷 第2期   页码 269-278 doi: 10.1007/s11705-020-1948-3

摘要： Hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios (Hier-ZSM-5- , where = 50, 100, 150 and 200) were synthesized using an ordered mesoporous carbon-silica composite as hard template. Hier-ZSM-5- exhibits improved mass transport properties, excellent mechanical and hydrothermal stability, and higher catalytic activity than commercial bulk zeolites in the benzyl alcohol self-etherification reaction. Results show that a decrease in the Si/Al ratio in hierarchical single-crystal ZSM-5 zeolites leads to a significant increase in the acidity and the density of micropores, which increases the final catalytic conversion. The effect of porous hierarchy on the diffusion of active sites and the final catalytic activity was also studied by comparing the catalytic conversion after selectively designed poisoned acid sites. These poisoned Hier-ZSM-5- shows much higher catalytic conversion than the poisoned commercial ZSM-5 zeolite, which indicates that the numerous intracrystalline mesopores significantly reduce the diffusion path of the reactant, leading to the faster diffusion inside the zeolite to contact with the acid sites in the micropores predominating in ZSM-5 zeolites. This study can be extended to develop a series of hierarchical single-crystal zeolites with expected catalytic performance.

关键词： hierarchical zeolites     single crystalline     interconnected pores     improved diffusion performance     benzyl alcohol self-etherification reaction    

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A wind tunnel study on control methods for cable dry-galloping

Hung D. VO,Hiroshi KATSUCHI,Hitoshi YAMADA,Mayuko NISHIO

《结构与土木工程前沿（英文）》 2016年 第10卷 第1期   页码 72-80 doi: 10.1007/s11709-015-0309-7

摘要： The common vibration of cable caused by rain-wind combination has been known as most typical type and a lot kind of its countermeasures has been proposed for suppressing this phenomenon. Recently, stayed-cables were also proved that they could be excited in dry state (without rain), which is called dry-galloping. Recently, its mechanisms have been explained by axial flow, Reynolds number and so on. To clarify the characteristics of this galloping, wind tunnel test of a cable model with various kinds of wind angle was conducted. Then, three types of countermeasure were examined to suppress dry- galloping of bridge cable. The tests confirmed that the occurrence of dry-galloping depends on relative wind attacked angles and onset reduced wind speed. Furthermore, single spiral wire, double spiral wire and circular ring were found to have high effectiveness in mitigating this galloping when those are installed properly.

关键词： dry-galloping     wind-relative angle     single spiral wire     double spiral wire     circular rings    

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双层辉光离子渗金属技术特点

高原,徐晋勇,高清,安晋平,徐重

《中国工程科学》 2008年 第10卷 第2期   页码 26-30

摘要：

分析了双层辉光技术的特点，指出该技术在材料表面合金化方面，是一项适合于高熔点金属 表面合金化和采用高熔点金属对铁基或某些熔点较高的有色金属材料进行表面合金化的工艺技术.

关键词： 双层辉光离子渗金属技术     高熔点金属     空心阴极效应     阴极溅射     扩散    

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单缝桥梁在温度作用下的结构受力计算

赵怡彬,邵旭东

《中国工程科学》 2012年 第14卷 第10期   页码 103-112

摘要：

桥台处伸缩缝问题是长期困扰工程界的难题，它会带来跳车、桥梁局部损坏、伸缩缝装置经常更换等各种问题。为有效解决这一问题，提出了一种适用于大中型桥梁的新型结构体系——单伸缩缝桥梁（单缝桥）。在考虑接线路面裂缝开展的情况下，建立了温度作用下单缝桥的简化计算模型，推导了单缝桥受力、变形的理论公式，用Fortran90编制程序，进行计算。以一座总长280 m的单缝梁桥为例，温度降低20 ℃时，接线路面钢筋最大应力为148 MPa，最大裂缝宽度为0.185 mm，符合规范要求；台后结构对主梁产生的附加应力仅为0.105 MPa，影响很小。通过对影响单缝桥性能的因素：支座类型、配筋率、接线路面长度、摩擦系数、土体刚度、桥长、温差等进行分析，绘制图表，得到以下主要结论：温降时，接线路面受拉，混凝土开裂，是较不利的状况；30 m长的接线路面可以满足结构受力和变形的需要；选择摩擦系数较小的支座和减少接线路面与垫层的摩擦力可以减少结构内力，在接线路面与垫层间推荐加铺土工格栅。

关键词： 单缝桥梁     温度作用     受力与变形     理论公式     参数分析    

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Experimental measurement of double-K fracture parameters of concrete with small-size aggregates

ZHANG Xiufang, XU Shilang, ZHENG Shuang

《结构与土木工程前沿（英文）》 2007年 第1卷 第4期   页码 448-457 doi: 10.1007/s11709-007-0061-8

摘要： The double- fracture model can well describe the development of cracks undergoing during the entire fracture process in concrete. Therefore, it has been selected as the theoretical basis of the Norm for fracture test of

关键词： development     concrete     theoretical     double- fracture    

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单边直线感应电机纵向边缘效应的研究

徐伟,孙广生

《中国工程科学》 2007年 第9卷 第3期   页码 21-27

摘要：

单边直线感应电机（SLIM）因结构简单牢固，直接产生前进的电磁推力，在交通中得到广泛应用。 由于其磁路断续，电机运行中存在横向和纵向边缘效应；次级的入口和出口因气隙磁链守恒原理会产生涡流， 并随速度上升而加大。边缘效应和涡流大小对直线电机气隙磁链产生重要影响，造成气隙有效磁通和牵引力系 数降低。探讨直线电机工作特点，得到了电机d－q轴等效电路，通过d轴互感和电阻变化来实时反应第二纵 向边缘效应和次级涡流的影响。结合旋转电机转子磁场矢量控制方法，建立了对应的SLIM控制方程。采用转子 磁链、速度和电流三个调节器，提出了uds，uqs，iqs实时在线解耦补偿控制方法，对SLIM的推力、d－q轴电压、d－q轴磁链等进行调节和控制，对d轴互感大小进行限制。结果表明，该方法在电机速度突变时减小了力 矩脉动，定子电流过渡平滑，速度平稳，改善了SLIM的运行性能，为电机实际运行分析提供了理论依据。

关键词： 单边直线感应电机     转子磁场定向控制     边缘效应     解耦     补偿    

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基于双目标渐进法的中国省域生态文明发展水平评估研究

解钰茜,张林波,罗上华,杨娇,李芬,王德旺

《中国工程科学》 2017年 第19卷 第4期   页码 60-66 doi: 10.15302/J-SSCAE-2017.04.010

摘要：

本文构建了包含4个领域、10个目标、25个指标的省域生态文明发展水平评估指标体系。在对比和改进现有数据标准化处理方法的基础上，提出双目标渐进法对评价指标进行归一化处理，并采用综合加权指数法对2014年我国的31个省、自治区、直辖市的生态文明发展水平进行评估。结果显示，我国生态文明发展水平较低，东南沿海地区生态文明发展水平高于中西部地区。总体来看，目前我国整体经济社会建设成效显著，但我国生态文明发展水平与预期目标及国际水平相比还有一定差距，因此在生态环境保护、工业污染控制、产业优化和资源高效利用方面还需加强。

关键词： 生态文明发展水平     省域生态文明评估     双目标渐进法     单目标渐进法     极差标准化    

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标题 作者 时间 类型 操作

Synergistic effect of V and Fe in Ni/Fe/V ternary layered double hydroxides for efficient and durable

期刊论文

Crystallographic orientation effect on cutting-based single atomic layer removal

Wenkun XIE, Fengzhou FANG

期刊论文

New branched benign compounds including double antibiotic scaffolds: synthesis, simulation and adsorptionfor anticorrosion effect on mild steel

期刊论文

Theoretical analysis of novel weak current sensor using FeCuNbSiB single nanocrystalline toroidal coreand double-winding

BAO Bing-hao, ZHU Da-qi, DING Jian-ning, LI Chang-sheng

期刊论文

Influence of HS and NH on biogas dry reforming using Ni catalyst: a study on single and synergetic effect

期刊论文

A new method of studying collapsibility of loess

Yuanqing ZHU , Zhenghan CHEN ,

期刊论文

analysis and optimization of 1,3-dimethylimidazolylium dimethylphosphate-water binary mixture for a singleeffect absorption refrigeration system

Gorakshnath TAKALKAR, Ahmad K. SLEITI

期刊论文

玻璃纤维复合材料新生态复合技术

回显权

期刊论文

The effect of hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios on its pore structure

Yuexin Hou, Xiaoyun Li, Minghui Sun, Chaofan Li, Syed ul Hasnain Bakhtiar, Kunhao Lei, Shen Yu, Zhao Wang, Zhiyi Hu, Lihua Chen, Bao-Lian Su

期刊论文

A wind tunnel study on control methods for cable dry-galloping

Hung D. VO,Hiroshi KATSUCHI,Hitoshi YAMADA,Mayuko NISHIO

期刊论文

双层辉光离子渗金属技术特点

高原,徐晋勇,高清,安晋平,徐重

期刊论文

单缝桥梁在温度作用下的结构受力计算

赵怡彬,邵旭东

期刊论文

Experimental measurement of double-K fracture parameters of concrete with small-size aggregates

ZHANG Xiufang, XU Shilang, ZHENG Shuang

期刊论文

单边直线感应电机纵向边缘效应的研究

徐伟,孙广生

期刊论文

基于双目标渐进法的中国省域生态文明发展水平评估研究

解钰茜,张林波,罗上华,杨娇,李芬,王德旺

期刊论文