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Magnetic Resonance Letters 2022年第4期2卷 205-213页

作者： Yunyan Li Yong Liu Huiqin Zhang Zhen wang Maosen Ruan Jiarong wang Jing Yang Bo Wu junfeng wang High Magnetic Field Laboratory CAS Key Laboratory of High Magnetic Field and Ion Beam Physical BiologyHefei Institutes of Physical ScienceChinese Academy of SciencesHefei230031China University of Science and Technology of China Hefei230026China Institutes of Physical Science and Information Technology Anhui UniversityHefei230601China Anhui University Hefei230039China

Fibroblast growth factor receptors(FGFRs)play an important role in the regulation of cell proliferation,migration and differentiation,while the juxtamembrane domain(JMD)of FGFRs is the key in mediating these transmembrane signal transduction ***,we expressed and purified the JMD(398K-470R)of FGFR1 with the presence of transmembrane domain(377I-397Y).The results from nuclear magnetic resonance(NMR)chemical shift analysis demonstrate that the main structure of JMD is ***,the N-terminus of JMD was observed to form a short a-helix upon introducing negatively charged lipid 1,2-dioleoyl-sn-glycero-3-phospho-L-serine(DOPS)into its membrane mimic ***,the N-terminus of JMD interacts with FRS2a,which is a substrate 2a of ***,we propose a model that FGFR1-JMD may interact with FRS2a and negatively charged lipids *** study provides a new understanding on the role of the JMD of FGFRs.

关键词： Fibroblast growth factor receptors(FGFRs) Juxtamembrane domain FGFR substrate 2a Negatively charged lipid Secondary structure transition Nuclear magnetic resonance(NMR) Protein-lipid interaction

Enhanced low-field magnetocaloric effect in Dy-doped hexagonal GdBO_(3) compounds

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Journal of Rare Earths 2023年第11期41卷 1728-1735,I0003页

作者： Huicai Xie Lu Tian Lei Zhang junfeng wang Hao Sun Xinqiang Gao Zhenxing Li Zhaojun Mo Jun Shen Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341119China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China

Borates have attained increasing attention attributed to their excellent thermal stability,distinctive thermodynamic property,and high mechanical strength in recent years.A series of polycrystalline Dydoped GdBO_(3) compounds was prepared,their crystal structures,magnetic properties,and cryogenic magnetocaloric effects were comprehensively *** compounds crystallize in hexagonal structure(space group P6_(3)/mmc),the lattice constant decreases with the increase of Dy *** in GdBO_(3) significantly reduces critical magnetic field and enhances low-field magnetocaloric *** maximum magnetic entropy changes for the Gd_(1-x)Dy_(x)BO_(3)(x=0.6,0.8,and 1)compounds in a field change of 2 T surpass 17.3 J/(kg·K)at 2.5 K,enhanced by nearly 120%compared to GdBO_(3)(8.0 J/(kg·K)).Besides,the corresponding refrigeration capacity increases from 33.9 to 62.2,57.2,and 72.5 J/kg,respectively,with an enhancement of 70%-110%.The considerable maximum magnetic entropy change,refrigerating capacity,and temperature averaged entropy change make them competitive candidates for cryogenic magnetic refrigeration.

关键词： Magnetocaloric effect Hexagonal GdBO_(3) Cryogenic magnetic refrigeration Magnetic entropy change Rare earths

High piezo/photocatalytic efficiency of Ag/Bi_(5)O_(7)I nanocomposite using mechanical and solar energy for N2 fixation and methyl orange degradation

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Green Energy & Environment 2023年第1期8卷 283-295页

作者： Lu Chen Wenqian Zhang junfeng wang Xiaojing Li Yi Li Xin Hu Leihong Zhao Ying Wu Yiming He Department of Materials Science and Engineering Zhejiang Normal UniversityJinhua321004China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua321004China

In this work,Ag/Bi_(5)O_(7)I nanocomposite was prepared and firstly applied in piezo/photocatalytic reduction of N2 to NH3 and methyl orange(MO)***_(5)O_(7)I was synthesized via a hydrothermal-calcination method and shows nanorods *** nanoparticles(NPs)were photo deposited on the Bi_(5)O_(7)I nanorods as electron trappers to improve the spatial separation of charge carriers,which was confirmed via XPS,TEM,and electronic chemical *** catalytic test indicates that Bi_(5)O_(7)I presents the piezoelectric-like behavior,while the loading of Ag NPs can strengthen the *** ultrasonic vibration,the optimal Ag/Bi_(5)O_(7)I presents high efficiency in MO *** degradation rate is determined to be 0.033 min1,which is 4.7 folds faster than that of Bi_(5)O_(7)*** Ag/Bi_(5)O_(7)I also presents a high performance in piezocatalytic N2 *** piezocatalytic NH3 generation rate reaches 65.4 μmol L^(-1)g^(-1)h^(-1)with water as a hole *** addition of methanol can hasten the piezoelectric catalytic ***,when ultrasonic vibration and light irradiation simultaneously act on the Ag/Bi_(5)O_(7)I catalyst,higher performance in NH3 generation and MO degradation is ***,due to the weak adhesion of Ag NPs,some Ag NPs would fall off from the Bi_(5)O_(7)I surface under long-term ultrasonic vibration,which would greatly reduce the piezoelectric catalytic *** result indicates that a strong binding force is required when preparing the piezoelectric composite *** current work provides new insights for the development of highly efficient catalysts that can use multiple energies.

关键词： Ag/Bi_(5)O_(7)I Piezocatalysis Photocatalysis N2 fixation MO degradation

Effect of Interface Form on Creep Failure and Life of Dissimilar Metal Welds Involving Nickel-Based Weld Metal and Ferritic Base Metal

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Chinese Journal of Mechanical Engineering 2024年第1期37卷 265-285页

作者： Xiaogang Li junfeng Nie Xin wang Kejian Li Haiquan Zhang Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

For dissimilar metal welds(DMWs)involving nickel-based weld metal(WM)and ferritic heat resistant steel base metal(BM)in power plants,there must be an interface between WM and BM,and this interface suffers mechanical and microstructure mismatches and is often the rupture location of premature *** this study,a new form of WM/BM interface form,namely double Y-type interface was designed for the *** behaviors and life of DMWs containing double Y-type interface and conventional I-type interface were compared by finite element analysis and creep tests,and creep failure mechanisms were investigated by stress-strain analysis and microstructure *** applying double Y-type interface instead of conventional I-type interface,failure location of DMW could be shifted from the WM/ferritic heat-affected zone(HAZ)interface into the ferritic HAZ or even the ferritic BM,and the failure mode change improved the creep life of *** interface premature failure of I-type interface DMW was related to the coupling effect of microstructure degradation,stress and strain concentrations,and oxide notch on the WM/HAZ *** creep failure of double Y-type interface DMW was the result of Type IV fracture due to the creep voids and micro-cracks on fine-grain boundaries in HAZ,which was a result of the matrix softening of HAZ and lack of precipitate pinning at fine-grain *** double Y-type interface form separated the stress and strain concentrations in DMW from the WM/HAZ interface,preventing the trigger effect of oxide notch on interface failure and inhibiting the interfacial microstructure *** is a novel scheme to prolong creep life and enhance reliability of DMW,by means of optimizing the interface form,decoupling the damage factors from WM/HAZ interface,and then changing the failure mechanism and shifting the failure location.

关键词： Dissimilar metal weld Nickel-based weld metal Ferritic heat resistant steel Interface Creep strain Microstructure Failure mechanism Creep life

NOMA技术在水声通信中的研究现状与发展方向

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北部湾大学学报 2024年第2期39卷 25-32页

作者：范永彬高建平王俊锋宣守锐北部湾大学机械与船舶海洋工程学院广西钦州535011

人们利用NOMA技术解决了陆地上多个用户在同一时间和频率资源上进行通信的问题,提高了系统的整体吞吐量以及通信速率。随着人类对海洋资源探索的加快,该技术被学术界广泛关注,并取得了一些成果。文章介绍了NOMA技术基本原理,并且就多址... 详细信息

人们利用NOMA技术解决了陆地上多个用户在同一时间和频率资源上进行通信的问题,提高了系统的整体吞吐量以及通信速率。随着人类对海洋资源探索的加快,该技术被学术界广泛关注,并取得了一些成果。文章介绍了NOMA技术基本原理,并且就多址接入技术在水声中的应用进行了综述,指出其将向智能算法、标准信道模型和部分非正交多址接入等方向发展。

关键词： NOMA 水声通信能量效率智能算法

新型水泥基抢修材料的早期强度与微观结构研究

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佳木斯大学学报（自然科学版） 2024年第5期42卷 90-93页

作者：刘亚炜鲁刘磊罗琦王建平刘锦红汪峻峰深圳大学土木与交通工程学院广东深圳518060 91053部队北京100000 佛山格耐特新型建筑材料科技有限公司广东佛山528000

研究了不同用水量对新型水泥基抢修材料流动性、早期强度和耐磨性能的影响,并通过SEM和MIP分析了抢修材料的微观形貌和孔结构。结果表明,增加用水量可以提高新型水泥基抢修材料的流动度,随着用水量增加,其早期强度先增后减,在14%时达到... 详细信息

研究了不同用水量对新型水泥基抢修材料流动性、早期强度和耐磨性能的影响,并通过SEM和MIP分析了抢修材料的微观形貌和孔结构。结果表明,增加用水量可以提高新型水泥基抢修材料的流动度,随着用水量增加,其早期强度先增后减,在14%时达到最高强度;用水量18%时,新型水泥基抢修材料的单位面积磨损量最小,即耐磨性能最好;用水量的增加会导致孔隙率增大,微观形貌更疏松。

关键词：抢修材料流动性抗压强度耐磨性能孔结构

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干旱胁迫对滇黄精多糖及其代谢酶的影响

分子植物育种 2024年第9期22卷 3087-3094页

作者：钱华丽王俊锋郭兰萍魏建昆丛琨张磊季鹏章云南中医药大学中药学院云南省南药可持续利用重点实验室昆明650500 云南省农业科学院药用植物研究所昆明650500 中国中医科学院中药资源中心道地药材国家重点实验室培养基地北京100700

为探究不同土壤水分条件下滇黄精块茎多糖积累的规律及其酶活性变化特征,本研究采用盆栽控水法,对3年生滇黄精植株进行4种水分胁迫处理,并对部分重度干旱植株进行复水处理;采用分光光度计法测定SS、SPS、AI、UGP、NI 5种酶的活性;采用0... 详细信息

为探究不同土壤水分条件下滇黄精块茎多糖积累的规律及其酶活性变化特征,本研究采用盆栽控水法,对3年生滇黄精植株进行4种水分胁迫处理,并对部分重度干旱植株进行复水处理;采用分光光度计法测定SS、SPS、AI、UGP、NI 5种酶的活性;采用0.2%蒽酮-硫酸比色法测定多糖含量。结果显示,SS、SPS、AI、UGP、NI分别在含水量在20%、40%、20%、20%、20%时酶活性达到峰值;滇黄精多糖含量在20%含水量处理组最高。干旱胁迫与多糖含量的相关性分析发现,土壤含水量与多糖含量呈显著负相关。本研究表明中度和重度干旱可以提高滇黄精多糖合成相关酶的活性,且有利于滇黄精块茎多糖的积累,能有效提高滇黄精品质,这对滇黄精的种植有十分重要的指导意义。

关键词：干旱胁迫酶活性多糖

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金通煤矿煤层分叉区分级支护技术研究

煤炭与化工 2024年第4期47卷 6-9页

作者：王俊峰刘毅涛郝晓伟姚伟鄂尔多斯市金通矿业有限公司内蒙古自治区鄂尔多斯010499

针对金通煤矿51111回风顺槽掘进至310 m时煤层出现分层,分层后成为5-1_(上)煤与5-1煤两层煤,且煤层硬度高于顶板岩层这一生产现状,提出分级支护关键技术,依次将锚杆、短锚索、长锚索分别锚固至稳定的5-1_(上)煤中,并结合FLAC3D数值模拟... 详细信息

针对金通煤矿51111回风顺槽掘进至310 m时煤层出现分层,分层后成为5-1_(上)煤与5-1煤两层煤,且煤层硬度高于顶板岩层这一生产现状,提出分级支护关键技术,依次将锚杆、短锚索、长锚索分别锚固至稳定的5-1_(上)煤中,并结合FLAC3D数值模拟软件对分级支护预应力场模拟研究,并进行现场应用。对巷道围岩变形情况进行监测,监测结果表明,围岩变形整体呈现“先迅速变大然后逐渐趋于稳定”的变化趋势,顶底板移近量低于20 mm,两帮移近量低于16 mm。该支护方案能够对顶板实现有效控制。

关键词：煤层分叉区分级支护数值模拟支护技术

Polyoxometalates coupled covalent organic frameworks as highly active photothermal nanoreactor for CO_(2)cycloaddition

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Nano Research 2024年第7期17卷 5975-5984页

作者： Tian wang Yunqing Zhu Wei wang junfeng Niu Zhiyi Lu Peilei He School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China University of Chinese Academy of Sciences Beijing 100049China

Covalent organic frameworks(COFs)-based nanoreactors have attracted broad interest in many fields due to their voidconfinement ***,the inherent drawback of conventional nanoreactors is the lack of internal active sites,which limits their widespread ***,we report the construction of hierarchical COF(EB-TFP)nanoreactor with pre-synthesized polyoxometalates(POM,[PV_(2)W_(10)O_(40)]^(5–)(PV_(2)W_(10)))clusters encapsulated inside of COF(POM@COF).PV_(2)W_(10)@EB-TFP anchors nucleophilic-group(Br–ions)and PV_(2)W_(10)anion cluster within the COF framework via electrostatic interactions,which not only simplifies the reaction system but also enhances catalytic *** reaction performance of the PV_(2)W_(10)@EB-TFP nanoreactor can be tuned to achieve excellent catalytic activity in CO_(2)cycloaddition reaction(CCR)for~97.63%conversion and~100%selectivity under visible light irradiation.A mechanistic study based on density functional theory(DFT)calculations and insitu characterization was also carried *** summary,we have reported a method for achieving the uniform dispersion of POM single clusters into COF nanoreactor,demonstrating the potential of POM@COF nanoreactor for synergistic photothermal catalytic CO_(2)cycloaddition.

关键词： photothermal nanoreactor CO_(2)cycloaddition polyoxometalate photothermal-synergistic catalysis covalent organic frameworks

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科宝500和AA白羽肉鸡生产性能比较分析

中国饲料 2024年第16期 1-4页

作者：连慧香章四新朱凤霞赵登顺彭峰赵云焕王俊锋信阳农林学院动物科技学院河南信阳464000 河南省正阳种猪场河南正阳463612 驻马店市动物疫病防疫检疫中心河南驻马店463000

文章旨在探讨科宝500和爱拔益加(AA)白羽肉鸡生产性能的差异。试验以科宝500和爱拔益加(AA)白羽肉鸡为研究对象,测定1~6周龄两个品种的平均采食量、平均体重、平均日增重、料重比、死淘率以及欧洲效益指数,分析比较两品种间生产性能的... 详细信息

文章旨在探讨科宝500和爱拔益加(AA)白羽肉鸡生产性能的差异。试验以科宝500和爱拔益加(AA)白羽肉鸡为研究对象,测定1~6周龄两个品种的平均采食量、平均体重、平均日增重、料重比、死淘率以及欧洲效益指数,分析比较两品种间生产性能的差异变化。结果表明:(1)科宝500肉鸡平均采食量前期变化较大,2周龄时显著高于AA肉鸡(P0.05);(2)7和35日龄时,科宝500肉鸡平均体重显著大于AA肉鸡(P0.05);(3)各周龄及整个试验期(1~6周龄)科宝500肉鸡料重比均低于AA肉鸡,但差异均不显著(P>0.05);(4)4周龄时,科宝500肉鸡死淘率显著高于AA肉鸡(P0.05);(5)欧洲效益指数(EPI)方面,科宝500肉鸡高于AA肉鸡,但差异不显著(P>0.05)。综合分析,科宝500肉鸡生产性能及养殖效益优于AA肉鸡。

关键词：白羽肉鸡科宝500 爱拔益加(AA) 生产性能