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Precious trimetallic single-cluster catalysts for oxygen and hydrogen electrocatalytic reactions:Theoretical considerations

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Nano Research 2023年第5期16卷 8042-8050页

作者： Xiaochuan Shi Yongcheng Li shan Zhang Riming Hu Shuang Gao Peipeng Jin Jiaxiang shang Jianglan Shui Qinghai Provincial Key Laboratory of New Light Alloys Qinghai Provincial engineering Research Center of High Performance Light Metal Alloys and FormingQinghai UniversityXining 810016China Qinghai Communications Technical College Xining 810003China Institute for Smart Materials&Engineering University of JinanJinan 250022China School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Single cluster catalysts(SCCs),which exhibit remarkable catalytic performance due to their high metal loading and synergy effect between metal atoms,have attracted great attention in ***,by means of density functional theory calculations,the oxygen reduction reaction(ORR),oxygen evolution reaction(OER),hydrogen evolution reaction(HER)performances of precious metal(Pt,Pd,Rh,Ir)trimetallic single-cluster electrocatalyst(U_(x)V_(y)W_(z)-NG)are *** calculation results show that Pt,Pd,Ir have significant effect on ORR,OER,HER,respectively,all the calculated U_(x)V_(y)W_(z)-NG structures are thermodynamically stable due to the negative formation energies and binding *** Pt_(3)-NG,Pd_(3)-NG,Ir_(3)-NG show the lowest ORR,OER,HER overpotentials of 0.63,0.77,−0.02 V,respectively,among all combinations of U_(x)V_(y)W_(z)-*** overpotentials are lower than that of precious metal single atom catalysts(SACs),which indicate better activities of precious trimetallic SCCs than those of *** electronic structure reveals that the O-2p orbital shows strong hybridization strength with Pt-3d orbitals in the system of OH adsorbed Pt_(3)-NG and thus facilitates the electrocatalytic *** results are helpful for the rational design of high-performance triatomic catalysts.

关键词： single-cluster catalysts trimetallic catalysts oxygen reduction reaction oxygen evolution reaction density functional theory

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气象因子与向日葵DUS测试测量型性状的关系

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作物杂志 2024年第3期 156-162页

作者：刘春晖杜瑞霞王永行杨钦方单飞彪胥福勋赵宇新陈舒舒刘伟巴彦淖尔市农牧业科学研究所内蒙古巴彦淖尔015000 中国气象局乌梁素海湿地生态气象野外科学试验基地内蒙古巴彦淖尔015000 内蒙古巴彦淖尔市气象局生态与农业气象中心内蒙古巴彦淖尔015000 内蒙古自治区中蒙医药研究院内蒙古呼和浩特010000

为明确主要气象因子与向日葵开花期等DUS测试测量型数量性状的关系,于2017-2022年连续6年在内蒙古巴彦淖尔市定点调查了气象数据和4个向日葵品种DUS测试性状数据,利用方差分析的方法对各品种DUS测试测量型数据年度间变化规律进行研究,... 详细信息

为明确主要气象因子与向日葵开花期等DUS测试测量型数量性状的关系,于2017-2022年连续6年在内蒙古巴彦淖尔市定点调查了气象数据和4个向日葵品种DUS测试性状数据,利用方差分析的方法对各品种DUS测试测量型数据年度间变化规律进行研究,后通过相关性分析明确向日葵数量性状与气象因子间的关系,利用逐步回归和通径分析的方法筛选出主要影响气象因子。结果发现,对开花期、叶片大小、株高和花盘大小影响最大的气象因子是温度和水分,而光照仅对开花期有一定影响;对籽粒厚度和籽粒大小影响最大的是最低温度和相对湿度。

关键词：向日葵 DUS测试气象因子通径分析

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广东鹅源多杀性巴氏杆菌的分离鉴定、耐药表型和耐药基因的检测及相关性分析

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中国预防兽医学报 2024年第2期46卷 121-127页

作者：苏文楠杨智灿张美琳钟嘉诚陈亦杏陈济铛张溢珊张济培佛山科学技术学院广东佛山528225 佛山天牧生物科技有限公司广东佛山528225

为了解广东地区鹅源多杀性巴氏杆菌(Pm)的流行情况、药物敏感性、耐药基因的携带情况以及耐药表型与耐药基因的相关性,本实验对2019年~2022年从广东地区采集的193份疑似感染Pm病鹅的心脏血液和肝脏组织划线接种于不同的培养基分离细菌,... 详细信息

为了解广东地区鹅源多杀性巴氏杆菌(Pm)的流行情况、药物敏感性、耐药基因的携带情况以及耐药表型与耐药基因的相关性,本实验对2019年~2022年从广东地区采集的193份疑似感染Pm病鹅的心脏血液和肝脏组织划线接种于不同的培养基分离细菌,对分离菌纯化后采用PCR扩增分离菌的KMT1基因并测序,采用多重PCR扩增分离菌的5个荚膜基因及8个脂多糖基因,分析分离菌的荚膜分型与脂多糖(LPS)分型。结果显示分离到83株鹅源Pm,其中82株为荚膜A型,1株无法通过荚膜定型;LPS分型为L1型。采用K-B纸片扩散法检测分离菌的药物敏感性;通过PCR检测分离菌7类药物的15种耐药基因,包括β-内酰胺类(bla_(CTX-M)、bla_(TEM)、bla_(OXA))、氨基糖苷类(aadA1、aph(3’)Ila)、喹诺酮类(qnrA、qnrB、qnrS)、酰胺醇类(floR)、四环素类(tetM、tetX)、大环内酯类(ermF、ereD)、磺胺类(sul1、sul3)耐药基因。采用统计学软件SPSS22中的完全随机设计两样本率的卡方检验分析分离菌的耐药表型和相应耐药基因的相关性。药敏试验结果显示,83株鹅源Pm对多种药物敏感性较高,其中对喹诺酮类的环丙沙星和氧氟沙星、氨基糖苷类的丁胺卡那和大观霉素、β-内酰胺类的头孢曲松、磺胺类的复方新诺明、大环内酯类的阿奇霉素敏感的菌株占比均在63%以上;对氨基糖苷类的链霉素和卡那霉素耐药的菌株占比高于50%,对氨基糖苷类的新霉素和四环素类的四环素耐药的菌株分别占49.40%(41/83)和46.99%(39/83)。耐药基因的检测结果显示,分离菌检出耐药基因qnrB、sul3、blaTEM、aadA1、aph(3’)Ila、ereD、ermF、tetM、floR,检出率分别为9.63%(8/94)、27.71%(23/83)、28.92%(24/83)、48.19%(40/83)、14.46%(12/83)、49.40%(41/83)、3.61%(3/83)、1.20%(1/83)、32.53%(27/83),未检出耐药基因qnrA、qnrS、sul1、tetX、bla_(CTX-M)、bla_(OXA)。相关性分析结果显示,aadA1基因与Pm对新霉素、链霉素、卡那霉素、大观霉素的耐药性具有极显著的相关性(P<0.001);bla_(CTX-M)基因、floR基因分别与Pm对头孢拉定、氟苯尼考的耐药性具有显著相关性(P<0.05)。上述结果表明,广东地区鹅源Pm主要为A∶L1基因型,对多种药物敏感,耐药基因携带率不高,部分药物的耐药表型与耐药基因具有相关性。本研究为广东地区鹅源Pm病的监测和防治提供参考依据,为Pm耐药机制的研究奠定基础。

关键词：多杀性巴氏杆菌药物敏感性试验耐药基因

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Ultrafine Vacancy-Rich Nb_(2)O_(5)Semiconductors Confined in Carbon Nanosheets Boost Dielectric Polarization for High-Attenuation Microwave Absorption

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Nano-Micro Letters 2023年第10期15卷 478-493页

作者： Zhe Su shan Yi Wanyu Zhang Xiaxi Xu Yayun Zhang Shenghu Zhou Bo Niu Donghui Long shanghai Key Laboratory of Multiphase Materials Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237People’s Republic of China Key Laboratory for Specially Functional Materials and Related Technology of the Ministry of Education East China University of Science and TechnologyShanghai 200237People’s Republic of China

The integration of nano-semiconductors into electromagnetic wave absorption materials is a highly desirable strategy for intensifying dielectric polarization loss;achieving high-attenuation microwave absorption and realizing in-depth comprehension of dielectric loss mechanisms remain ***,ultrafine oxygen vacancy-rich Nb_(2)O_(5)semiconductors are confined in carbon nanosheets(ov-Nb_(2)O_(5)/CNS)to boost dielectric polarization and achieve high *** polarization relaxation,electromagnetic response,and impedance matching of the ov-Nb_(2)O_(5)/CNS are significantly facilitated by the Nb_(2)O_(5)semiconductors with rich oxygen vacancies,which consequently realizes an extremely high attenuation performance of-80.8 dB(>99.999999%wave absorption)at 2.76 *** a dielectric polarization center,abundant Nb_(2)O_(5)–carbon heterointerfaces can intensify interfacial polarization loss to strengthen dielectric polarization,and the presence of oxygen vacancies endows Nb_(2)O_(5)semiconductors with abundant charge separation sites to reinforce electric dipole ***,the three-dimensional reconstruction of the absorber using microcomputer tomography technology provides insight into the intensification of the unique lamellar morphology regarding multiple reflection and scattering dissipation ***,ov-Nb_(2)O_(5)/CNS demonstrates excellent application potential by curing into a microwave-absorbing,machinable,and heat-dissipating *** work provides insight into the dielectric polarization loss mechanisms of nano-semiconductor/carbon composites and inspires the design of high-performance microwave absorption materials.

关键词： Electromagnetic wave absorption Nb_(2)O_(5)semiconductor Dielectric polarization loss Oxygen vacancy Nb_(2)O_(5)-carbon hetero-interface

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Lanthanide-based ratiometric luminescence nanothermometry

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Nano Research 2023年第2期16卷 2949-2967页

作者： Mochen Jia Xu Chen Ranran Sun Di Wu Xinjian Li Zhifeng Shi Guanying Chen Chongxin shan Key Laboratory of Materials Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering&Key Laboratory of Micro-systems and Micro-structuresMinistry of EducationHarbin Institute of TechnologyHarbin 150001China

Luminescent nanothermometry can precisely and remotely measure the internal temperature of objects at nanoscale precision,which,therefore,has been placed at the forefront of scientific *** particular,due to the high photochemical stability,low toxicity,rich working mechanisms,and superior thermometric performance,lanthanide-based ratiometric luminesencent thermometers are finding prevalent uses in integrated electronics and optoelectronics,property analysis of in-situ tracking,biomedical diagnosis and therapy,and wearable e-health *** recent progresses,it remains debate in terms of the underlying temperature-sensing mechanisms,the quantitative characterization of performance,and the reliability of temperature *** this review,we show the origin of thermal response luminescence,rationalize the ratiometric scheme or thermometric mechanisms,delve into the problems in the characterization of thermometric performance,discuss the universal rules for the quantitative comparison,and showcase the cutting-edge design and emerging applications of lanthanide-based ratiometric ***,we cast a look at the challenges and emerging opportunities for further advances in this field.

关键词： luminescent nanothermometry lanthanide ions ratiometric thermometers thermal imaging

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Investigation of internal phases of linear SBS modified bitumen at the nanoscale using AFM PF-QNM

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第3期10卷 399-412页

作者： Chengwei Xing Liping Liu Wei Jiang Jinhuan shan Jingjing Xiao Dongdong Yuan Wangjie Wu Key Laboratory of Special Area Highway Engineering of Ministry of Education Chang'an UniversityXi'an 710064China School of Highway Chang'an UniversityXi'an 710064China Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 201804China School of Civil Engineering Chang'an UniversityXi'an 710064China

Currently,few studies explore the internal phases of styrene-butadiene-styrene(SBS)modified bitumen at the nanoscale,though the surface phases of SBS modified bitumen have been deeply understood through a lot of *** present study uses the atomic force microscopy(AFM)peak force quantitative nanomechanical mode(PF-QNM)to investigate the nanomechanical properties of the interior of linear SBS modified bitumen and corresponding mastics at the ***,the suitable experimental methods for the interior of bitumen and mastics are ***,the phase relationship between surfaces and interiors of linear SBS modified bitumen is determined by analyzing nanomechanical *** this basis,in comparison with the internal phases of base bitumen,the effect of modifiers on phases is deeply ***,the internal phases of linear SBS modified bituminous mastics are further *** results reveal that the interior of linear SBS modified bitumen only has two phases,which form in a manner like periphase and paraphase on the *** contrast to base bitumen,linear SBS modified bitumen does not create new phases and change the properties of original phases in the interior,but affects the proportion of A-phase and B-phase and presents the ***,due to the influence of preparation methods,only the bitumen area away from the fillers can be imaged by AFM *** can be found that the addition of mineral fillers also slightly changes the internal phase distribution of linear SBS modified bitumen,while the effect is less than that of fillers on base bitumen.

关键词： Road engineering SBS modified bitumen Internal phase AFM PF-QNM

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Volume viewer椎体容积测量在胸腰椎骨折伤椎椎体内植骨中的应用

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实用临床医学（江西） 2024年第2期25卷 27-31页

作者：熊绪刘家明刘志礼黄山虎钱珊高静陈江伟吴志华南昌大学第一附属医院骨科南昌330006 南昌大学第一附属医院肿瘤科南昌330006 南昌大学第一附属医院影像科南昌330006 南昌大学脊柱脊髓系统疾病江西省重点实验室南昌330006

目的探讨Volume viewer椎体容积测量在胸腰椎骨折伤椎椎体内植骨中的应用效果。方法收集2015—2021年收治的单节段胸腰椎骨折患者的临床资料,采用AW Siever 3.2后处理工作站Volume viewer对患者术前伤椎椎体CT扫描数据进行分析,精确计... 详细信息

目的探讨Volume viewer椎体容积测量在胸腰椎骨折伤椎椎体内植骨中的应用效果。方法收集2015—2021年收治的单节段胸腰椎骨折患者的临床资料,采用AW Siever 3.2后处理工作站Volume viewer对患者术前伤椎椎体CT扫描数据进行分析,精确计算术前伤椎椎体容积。将伤椎丢失容积<50%患者归为低丢失组,伤椎丢失容积≥50%者归为高丢失组,比较2组术后伤椎高度变化及再压缩发生率。结果共纳入70例患者,其中低丢失组37例,高丢失组33例。高丢失组患者术前伤椎容积和椎体前缘高度低于低丢失组(P<0.05)。高丢失组术后即刻及末次随访时椎体前缘高度恢复低于低丢失组(P<0.05)。高丢失组术后伤椎再压缩发生率高于低丢失组(48.5%比10.8%,P<0.05)。低丢失组中植骨患者术后再压缩发生率均与未植骨患者比较,差异无统计学意义(25.0%比9.1%,P=0.380);高丢失组中植骨患者术后再压缩发生率与未植骨患者比较差异无统计学意义(30.0%比56.5%,P=0.260)。结论术前伤椎椎体容积丢失≥50%的单节段胸腰椎骨折患者,其术后伤椎再压缩发生率高,而伤椎椎体植骨有降低术后再压缩发生率的可能。

关键词：胸腰椎骨折椎体再压缩伤椎椎体容积测量伤椎椎体内植骨

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Microstructure, mechanical, and corrosion properties of extruded low-alloyed Mg–xZn–0.2Ca alloys

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International Journal of Minerals,Metallurgy and Materials 2019年第10期26卷 1274-1284页

作者： Ying-zhong Ma Chang-lin yang Yun-jin Liu Fu-song Yuan shan-shan Liang Hong-xiang Li Ji-shan Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Center of Digital Dentistry Peking University School and Hospital of StomatologyBeijing 100081China Second Clinical Division Peking University Hospital of StomatologyBeijing 100081China

The microstructure, mechanical, and corrosion properties of extruded low-alloyed Mg xZn 0.2Ca (x=0, 1.0, 2.0, 3.0) alloys were investigated in this study. Findings from scanning electron microscope, X-ray diffraction and transmission electron microscopy results indicate that the amount of ternary Ca2Mg6Zn3 phase, as the only secondary phase in 1.0Zn, 2.0Zn, and 3.0Zn alloys, gradually increases with the addition of Zn, while the Mg2Ca phase was observed in the Mg 0.2Ca alloy only. Zn has a strong effect on the orientation and intensity of textures, which also influence mechanical behaviors, as revealed by electron back-scatter diffraction. Among all the alloys, the Mg 2.0Zn 0.2Ca alloy obtains the maximum tensile strength (278 MPa) and yield strength (230 MPa). Moreover, Zn addition has an evident influence on the corrosion properties of Mg xZn 0.2Ca alloy, and Mg 1.0Zn 0.2Ca alloy exhibits the minimum corrosion rate. This paper provides a novel low-alloyed magnesium alloy as a potential biodegradable material.

关键词： magnesium alloy Mg Zn Ca alloy extrusion microstructure mechanical properties corrosion properties textures

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Nanocellulose/nitrogen and fluorine co-doped graphene composite hydrogels for high-performance supercapacitors

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Nano Research 2023年第7期16卷 9519-9529页

作者： Yong Zhang Qingyun Zhou Wenhui Ma Chaohui Wang Xuefeng Wang Jiajun Chen Tiantian Yu shan Fan College of Materials Science and Engineering Graphene Functional Materials Research LaboratoryQiqihar UniversityQiqihar 161006China College of Materials Science and Engineering Heilongjiang Province Key Laboratory of Polymeric Composition MaterialQiqihar UniversityQiqihar 161006China School of Chemistry and Chemical Engineering Qiqihar UniversityQiqihar 161006China Department of Practice Teaching and Equipment Management Qiqihar UniversityQiqihar 161006China

Three-dimensional graphene materials have been studied as typical supercapacitors electrode materials by virtue of their ultrahigh specific surface area and good ion transport ***,improvement of the poor volumetric electrochemical performance of these graphene materials has been required although they have high gravimetric energy *** this work,nanocellulose/nitrogen and fluorine co-doped graphene composite hydrogels(NC-NFGHs)were prepared through a convenient hydrothermal approach utilizing ammonium fluoride as the heteroatom ***(NC)and high concentration of graphene oxide(GO)were utilized to adjust the structure of NC-NFGHs and increase their packing ***,the aqueous symmetric supercapacitor based on NC-NFGH-80 exhibits remarkable gravimetric(286.6 F·g^(-1))and volumetric(421.3 F·cm^(-3))specific capacitance at 0.3 A·g^(-1),good rate performance,and remarkable cycle stability up to 10,000 ***,the all-solid-state flexible symmetric supercapacitors(ASSC)fabricated by NC-NFGH-80 also delivered a large specific capacitance of 117.1 F·g^(-1)at 0.3 A·g^(-1)and long service life over 10,000 cycles at 10 A·g^(-1).This compact porous structure and heteroatom co-doped graphene material supply a favorable strategy for high-performance supercapacitors.

关键词： compact graphene composite hydrogel high packing density N/F co-doping gravimetric/volumetric performances supercapacitors

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Trigger and response mechanisms for controlled release of corrosion inhibitors from micro/nanocontainers interpreted using endogenous and exogenous stimuli:A review

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Journal of Materials Science & Technology 2022年第30期125卷 67-80页

作者： shan Chen Zhongyu Huang Mingzhe Yuan Guang Huang Honglei Guo Guozhe Meng Zhiyuan Feng Ping Zhang School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Department of Civil and Environmental Engineering Faculty of Science and TechnologyUniversity of MacaoTaipaMacao SARChina

Metallic corrosion can lead to both economic losses and environmental pollution due to undesired chemical and biochemical ***,there are a number of drawbacks associated with different corrosion prevention and mitigation *** view of these challenges,corrosion inhibitor-based smart micro/nanocontainers(CISCs)with stimuli-responsive functionality emerge as an important alternative technical approach in dealing with metallic *** development of CISCs involves controlled release corrosion inhibitors and self-healing *** review focuses on the trigger and response mechanisms of controlling the discharge of corrosion inhibitors from micro/nanocontainers(a core-shell or layered structure)into aqueous solution under endogenous(pH,redox,and ion-exchange).exogenous(temperature,magnetic field,and light),and multiple *** these CISCs are embedded into coating materials,the self-healing effect of the coating can manifest to protect various types of *** this review effort,different types of CISCs are classified for the first time into the following three categories:inorganic,organic,and organic-inorganic *** also discuss application scope,future perspectives,and research strategies for CISCs in the hopes of increasing the life of corrosion protection and providing inspiration in related fields.

关键词： Smart micro/nanocontainers Stimuli-responsive Controlled release Corrosion protection Mechanism

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