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Precision tuning of highly efficient Pt-based ternary alloys on nitrogen-doped multi-wall carbon nanotubes for methanol oxidation reaction

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Journal of Energy Chemistry 2024年第1期88卷 242-251,I0006页

作者： Xingqun Zheng Zhengcheng wang Qian Zhou qingmei wang Wei He Shun Lu College of Safety Engineering Chongqing University of Science&TechnologyChongqing 401331China College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China School of Chemistry and Chemical Engineering Guizhou UniversityGuizhou 550025GuiyangChina Department of Chemistry University of Rhode IslandKingston 02881Rhode IslandUnited States Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China

The electrochemical methanol oxidation is a crucial reaction in the conversion of renewable *** enable the widespread adoption of direct methanol fuel cells(DMFCs),it is essential to create and engineer catalysts that are both highly effective and robust for conducting the methanol oxidation reaction(MOR).In this work,trimetallic PtCoRu electrocatalysts on nitrogen-doped carbon and multi-wall carbon nanotubes(PtCoRu@NC/MWCNTs)were prepared through a two-pot synthetic *** acceleration of CO oxidation to CO_(2) and the blocking of CO reduction on adjacent Pt active sites were attributed to the crucial role played by cobalt atoms in the as-prepared *** precise control of Co atoms loading was achieved through precursor *** physicochemical techniques were employed to analyze the morphology,element composition,and electronic state of the *** investigations and theoretical calculations confirmed that the Pt_(1)Co_(3)Ru_(1)@NC/MWCNTs exhibit excellent electrocatalytic performance and durability for the process of *** enhanced MOR activity can be attributed to the synergistic effect between the multiple elements resulting from precisely controlled Co loading content on surface of the electrocatalyst,which facilitates efficient charge *** interaction between the multiple components also modifies the electronic structures of active sites,thereby promoting the conversion of intermediates and accelerating the MOR ***,achieving precise control over Co loading in PtCoRu@NC/MWCNTs would enable the development of high-performance catalysts for DMFCs.

关键词： Ternary alloys Electrocatalysts Methanol oxidation reaction Electron transfer Theoretical calculations

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Improving the electrocatalytic performances of Pt-based catalysts for oxygen reduction reaction via strong interactions with single-CoN_(4)-rich carbon support

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Chinese Chemical Letters 2024年第5期35卷 265-271页

作者： Jin Long Xingqun Zheng Bin wang Chenzhong Wu qingmei wang Lishan Peng Guizhou University Key Laboratory of Green Chemical and Clean Energy Technology Guizhou University Engineering Research Center of Efficient Utilization for Industrial WasteInstitute of Dual-carbon and New Energy Technology Innovation and Development of Guizhou ProvinceSchool of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China College of Safety Engineering Chongqing University of Science&TechnologyChongqing 401331China Key Laboratory of Rare Earths Chinese Academy of SciencesGanjiang Innovation AcademyGanzhou 341119China

Developing platinum-group-metal(PGM)catalysts possessing strong metal-support interaction and controllable PGM size is urgent for the sluggish oxygen reduction reaction(ORR)in proton-exchange membrane fuel ***,we propose an in-situ self-assembled reduction strategy to successfully induce highly-dispersed sub-3nm platinum nanoparticles(Pt NPs)to attach on resin-derived atomic Co coordinated by N-doped carbon substrate(Pt/Co_(SA)-N-C)for *** be specific,the interfacial electron interaction effect,along with a highly robust Co_(SA)-N-C support endow the as-fabricated Pt/Co_(SA)-N-C catalyst with significantly enhanced catalytic properties,i.e.,a mass activity(MA)of 0.719 A/mgPt at 0.9 ViR-free and a reduction of 24.2%in MA after a 20,000-cycles *** functional theory(DFT)calculations demonstrate that the enhanced electron interaction between Pt and Co_(SA)-N-C support decreases the dband center of Pt,which is in favor of lowering the desorption energy of ^(*)OH on Pt/Co_(SA)-N-C surface and accelerating the formation of H_(2)O,thus enhance the instinct activity of ***,the higher binding energy between Pt and Co_(SA)-N-C compared to Pt and C indicates that the migration of Pt has been suppressed,which theoretically explains the improved durability of Pt/Co_(SA)-*** work offers an enlightenment on constructing composite Pt-based catalysts with multiple active sites.

关键词： Fuel cells Oxygen reduction reaction Platinum Single-CoN_(4)-rich carbon support Metal-substrate interaction

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单侧双通道内镜技术对腰椎间盘突出合并腰椎管狭窄症患者腰椎功能的改善作用分析

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临床研究 2025年第1期33卷 15-18页

作者：徐海亮丁亚杰王青梅兰考第一医院疼痛科河南开封475300

目的研究单侧双通道内镜技术在腰椎间盘突出合并腰椎管狭窄症患者中的效果。方法选取兰考第一医院2022年5月至2024年1月收入的62例腰椎间盘突出合并腰椎管狭窄症患者,根据治疗方法不同,分为两组,均31例。对照组使用全椎板切除术,研究组... 详细信息

目的研究单侧双通道内镜技术在腰椎间盘突出合并腰椎管狭窄症患者中的效果。方法选取兰考第一医院2022年5月至2024年1月收入的62例腰椎间盘突出合并腰椎管狭窄症患者,根据治疗方法不同,分为两组,均31例。对照组使用全椎板切除术,研究组使用单侧双通道内镜技术,比较两组患者手术指标、使用日本骨科协会评估治疗分数(JOA)、视觉模拟量表(VAS)、Oswestry功能障碍指数(ODI)比较两组治疗前后腰痛程度、疼痛情况以及腰椎功能,同时比较两组患者炎症因子指标。结果研究组患者手术时间、住院时间均短于对照组患者,术中出血量低于对照组患者,差异有统计学意义(P0.05);治疗后,研究组JOA评分高于对照组,差异有统计学意义(P0.05);治疗后,研究组VAS评分低于对照组,差异有统计学意义(P0.05);治疗后,研究组ODI评分低于对照组,差异有统计学意义(P<0.05)。研究组患者术后48 h肿瘤坏死因子α(TNF-α)、白细胞介素1α(IL-1α)、白细胞介素-6(IL-6)水平均低于对照组,差异有统计学意义(P<0.05)。结论治疗腰椎间盘突出合并腰椎管狭窄症时,采用单侧双通道内镜技术可以有效缩短手术和住院时间,减少术中出血,改善腰椎功能,降低疼痛,并减轻炎症反应。

关键词：腰椎功能单侧双通道内镜技术腰椎管狭窄症腰椎间盘突出症

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Enhanced spectral splitting in a novel solar spectrum optical splitter based on one dimensional photonic crystal heterostructure

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Journal of Materiomics 2021年第3期7卷 648-655页

作者： Dong Wei Feng Cao Zuoxu Wu Yijie Liu Jian wang qingmei wang Xingjun Liu Qian Zhang School of Science and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemHarbin Institute of TechnologyShenzhenGuangdong518055China Department of Materials Science and Engineering Harbin Institute of TechnologyShenzhenGuangdong518055China

Controlling the distribution of solar spectrum in different bands would boost the energy harvesting efficiency and optimize the energy dispatchability.1D photonic crystal with intrinsic optical band gap can be used to split the solar spectrum for hybrid photovoltaic/thermal solar ***,we designed an efficient solar spectrum optical filter based on a cermet layer,Si/SiO_(2)1D photonic crystal,and top heterostructure *** with 1D photonic crystal structure,the 1D photonic crystal heterostructure with top YSZ layer can realize the reflectance of greater than 92%in PV band and the low average reflectance in two thermal bands by tuning the effective impedance of multilayer *** enhanced reflectance in PV band results from the huge mismatching of impedance between free space and the heterostructure *** top dielectric layer can also be extended to other oxides.

关键词： Solar spectral splitting 1D photonic crystal heterostructure Solar absorptance Effective impedance

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Akt Inhibitor Perifosine Prevents Epileptogenesis in a Rat Model of Temporal Lobe Epilepsy

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Neuroscience Bulletin 2018年第2期34卷 283-290页

作者： Feng Zhu Jiejing Kai Linglin Chen Meiling Wu Jingyin Dong qingmei wang Ling-Hui Zeng Department of Clinical Medicine School of MedicineZhejiang University City College Department of Pharmacology Zhejiang University School of Medicine

Accumulating data have revealed that abnormal activity of the mTOR(mammalian target of rapamycin)pathway plays an important role in epileptogenesis triggered by various factors. We previously reported that pretreatment with perifosine, an inhibitor of Akt(also called protein kinase B), abolishes the rapamycin-induced paradoxical increase of S6 phosphorylation in a rat model induced by kainic acid(KA). Since Akt is an upstream target in the mTOR signaling pathway, we set out to determine whether perifosine has a preventive effect on epileptogenesis. Here, we explored the effect of perifosine on the model of temporal epilepsy induced by KA in rats and found that pretreatment with perifosine had no effect on the severity or duration of the KA-induced status epilepticus. However, perifosine almost completely inhibited the activation of p-Akt and p-S6 both acutely and chronically following the KA-induced status *** pretreatment suppressed the KA-induced neuronal death and mossy fiber sprouting. The frequency of spontaneous seizures was markedly decreased in rats pretreated with perifosine. Accordingly, rats pretreated with perifosine showed mild impairment in cognitive functions. Collectively, this study provides novel evidence in a KA seizure model that perifosine may be a potential drug for use in anti-epileptogenic therapy.

关键词： Akt-mTOR signaling Perifosine Kainic acid Spontaneous seizure Cognitive function

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Same Origin Three-Dimensional Strain Detection FBG Sensor Based on Elliptical Ring and Its Optimization

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Photonic Sensors 2015年第2期5卷 146-151页

作者： Shanchao JIANG Jing wang qingmei SUI Qinglin YE School of Control Science and Engineering Shandong University Jinan 250061 China

In order to achieve the same origin three-dimensional （3D） strain measurement, one three-dimensional （3D） fiber Bragg grating （FBG） strain sensor is proposed in this paper. The metal structure of this sensor is composed by three elliptical tings with different geometrical parameters. All these elliptical tings make sure that this sensor achieves the same origin 3D strain detection and increases the strain measurement coefficient. A theory calculation model of this sensor is established. The finite element method is utilized to optimize this sensor and verify the correctness of the theory model. After sensor optimization, 1 mm is chosen as the radical thickness of this sensor based on taking high strain detection coefficient and structure strength into account. To further obtain detection characteristics of this sensor, the calibration experiment is carried out. Experimental data of FBG1 which is the core sensitive element of this sensor is chosen as the specimen to be analyzed by the least square method. When the wavelength of FBG1 is changed by external stress, wavelengths of FBG2 and FBG3 have just a little fluctuation maybe caused by the fiber demodulation instrument SM125. So sensitive elements （FBG1, FBG2, and FBG3） of this sensor have no crosstalk problem for three-dimensional detection. After data analysis, the measuring coefficient of FBG1 is 0.05 nm/N. Similarly, the coefficients of FBG2 and FBG3 are 0.045 nm/N and 0.39nm/N, respectively. All these data confirm that this sensor could achieve the same origin 3D strain measurement without the crosstalk problem and has certain practical applications.

关键词： Fiber Bragg grating 3D strain measurement finite element method sensor optimization

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Development of a high-density SSR genetic linkage map in sweet potato

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The Crop Journal 2021年第6期9卷 1367-1374页

作者： Yusha Meng Chenxing Zheng Hui Li Aixian Li Hong Zhai qingmei wang Shaozhen He Ning Zhao Huan Zhang Shaopei Gao Qingchang Liu Key Laboratory of Sweetpotato Biology and Biotechnology Ministry of Agriculture and Rural Affairs/Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis&Utilization and Joint Laboratory for International Cooperation in Crop Molecular BreedingMinistry of EducationCollege of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193China Crop Research Institute Shandong Academy of Agricultural SciencesJinan 250100ShandongChina

Simple sequence repeat(SSR) markers have been proved to be a very powerful tool for quantitative trait locus(QTL) mapping, marker-assisted selection and comparative genomics research in many crop species. However, a high-density SSR genetic linkage map is still lacking because there are only a few SSR markers available in sweet potato. In this study, a total of 2545 simple sequence repeat(SSR) primer pairs, including 1215 genomic SSR(gSSR) primer pairs and 1330 BES-SSR(bSSR) primer pairs designed from the genome sequence and BAC-end sequence of sweet potato, respectively, were screened with sweet potato cultivars Luoxushu 8 and Zhengshu 20 and their randomly sampled two F1 individuals and 571 of them generated polymorphic bands. The selected 571 polymorphic SSR primer pairs and 35 EST-based SSR(eSSR) primer pairs developed at our laboratory were used to genotype 240 F1 individuals derived from a cross between Luoxushu 8 and Zhengshu 20. A double pseudo-test-cross strategy was applied for linkage analysis. The Luoxushu 8 map included 90 linkage groups with 5057 SSR markers and covered 13,299.9 cM with a marker density of 2.6 cM, and the Zhengshu 20 map contained 90 linkage groups with 3009 SSR markers and covered 11,122.9 cM with a marker density of 3.7 cM. Fifteen homologous groups were identified in both parent maps. These are the first SSR linkage maps consisting of the complete 90 linkage groups and 15 homologous groups, which are consistent with the autohexaploid nature of sweetpotato, and are also the linkage maps with the highest SSR marker density reported to *** results provide a basis for QTL mapping, marker-assisted breeding and comparative genomics research of sweet potato.

关键词： Sweet potato SSR Pseudo-test-cross strategy Linkage map Autohexaploid

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Enhanced thermoelectric performance in Ti(Fe, Co, Ni)Sb pseudoternary Half-Heusler alloys

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Journal of Materiomics 2021年第4期7卷 756-765页

作者： qingmei wang Xiaodong Xie Shan Li Zongwei Zhang Xiaofang Li Honghao Yao Chen Chen Feng Cao Jiehe Sui Xingjun Liu Qian Zhang School of Materials Science and Engineering Institute of Materials Genome&Big DataHarbin Institute of TechnologyShenzhen518055China School of Science Harbin Institute of TechnologyShenzhen518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China

TiFe0.5Ni0.5Sb-based half-Heusler compounds have the intrinsic low lattice thermal conductivity and the adjustable band *** by the previously reports to achieve both p-and n-type components by tuning the ratio of Fe and Ni based on the same parent TiFe0.5Ni0.5Sb,we selected Co as the amphoteric dopants to prepare both n-type and p-type pseudo-ternary Ti(Fe,Co,Ni)Sb-based halfHeusler *** carrier concentration,as well as the density of states effective mass was significantly increased by Co doping,contributing to the enhanced power factor of 1.80 mW m^(-1) K^(-2) for n-type TiFe0.3Co_(0.2)Ni_(0.5)Sb and 2.21 mW m^(-1) K^(-2) for p-type TiFe_(0.5)Co_(0.15)Ni_(0.35)Sb at 973 *** with the further decreased lattice thermal conductivity due to the strain field and mass fluctuation scattering induced by alloying Hf on the Ti site,peak ZTs of 0.65 in n-type Ti0.8Hf_(0.2)Fe_(0.3)Co_(0.2)Ni_(0.5)Sb and 0.85 in ptype Ti0.8Hf_(0.2)Fe_(0.5)Co_(0.15)Ni_(0.35)Sb were achieved at 973 K,which is of great significance for the thermoelectric power generation applications.

关键词： Thermoelectric Half-Heusler TiFe0.5Ni0.5Sb Carrier concentration Lattice thermal conductivity

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贵州屯堡山歌论——兼与贵州少数民族山歌比较

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民族文学研究 2010年第1期28卷 26-32页

作者：汪青梅北京师范大学文学院

在与贵州少数民族山歌的对照中,考察明代移民至贵州的汉族后裔屯堡人的唱山歌活动。屯堡山歌长于正统教化,短于婚恋交往。传承至今,屯堡人唱山歌历经活动场域从村外到村内、由村内公共场所到个体家庭,山歌内容从谈情说爱为主到广泛加进... 详细信息

在与贵州少数民族山歌的对照中,考察明代移民至贵州的汉族后裔屯堡人的唱山歌活动。屯堡山歌长于正统教化,短于婚恋交往。传承至今,屯堡人唱山歌历经活动场域从村外到村内、由村内公共场所到个体家庭,山歌内容从谈情说爱为主到广泛加进其他生活内容的变迁过程。咏唱中国历史朝代的历史故事歌作为屯堡山歌中的特殊内容,彰显其独特历史文化身份。

关键词：屯堡少数民族山歌

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冷却速度对金属玻璃性能的影响

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稀有金属材料与工程 2016年第12期45卷 3255-3261页

作者：王美玲王庆梅惠希东北京科技大学国家材料服役安全科学中心北京100083 北京科技大学新金属材料国家重点实验室北京100083

采用单辊真空薄带技术和真空吸铸法分别制备了相同成分的金属玻璃薄带和块体金属玻璃。通过示差扫描热分析(DSC)、X射线衍射(XRD)、高分辨透射电子显微镜(HRTEM)和纳米力学探针(Nano Indenter)等技术研究了冷却速度对金属玻璃的组织结... 详细信息

采用单辊真空薄带技术和真空吸铸法分别制备了相同成分的金属玻璃薄带和块体金属玻璃。通过示差扫描热分析(DSC)、X射线衍射(XRD)、高分辨透射电子显微镜(HRTEM)和纳米力学探针(Nano Indenter)等技术研究了冷却速度对金属玻璃的组织结构、热稳定性及力学性能的影响。结果表明:快速冷却得到的金属玻璃薄带和相同成分以较慢的冷却速度制备的块体金属玻璃相比,短程有序结构(SRO)的晶体结构相同,但数量较少,且自由体积含量相对较多;组织结构的差异导致金属玻璃薄带比块体金属玻璃有着更高的热稳定性、屈服强度,弹性模量和硬度。

关键词：金属玻璃热稳定性冷却速度短程有序结构

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