检索结果-南通市图书馆

Solvation structure design for stabilizing MXene in transition metal ion solutions

SusMat 2024年第3期4卷 214-226页

作者： Jie Wang Guohao Li Guanshun Xie Zhaohui Huang Peng zhang Benhua Xu Xiuqiang Xie Nan zhang College of Materials Science and Engineering Hunan UniversityChangshaChina Qinghai Provincial Engineering Research Center of High-Performance Light Metal Alloys and Forming Qinghai Provincial Key Laboratory of New Light AlloysQinghai UniversityXiningChina Chemical Engineering College Qinghai UniversityXiningChina

Although MXene has attracted great interest in diverse fields,it is susceptible to oxidation in water(H_(2)O)with transition metal ions such as Co^(2+),Fe^(2+),and Cu^(2+),which is pronounced at high *** impedes the preparation of MXene-based composites and their functional ***,this study revealed that Co^(2+)increases the maximum and average atomic charge of H in H_(2)O to improve the reactivity of H_(2)O,which leads to the fact that Co^(2+)catalyzes the oxidation of Ti_(3)C_(2)T_(x)***,the addition of N,Ndimethyl formamide(DMF)reduces theH_(2)Oactivity and improves the oxidation stability of Ti_(3)C_(2)T_(x)in the presence of Co^(2+)via preferentially forming coordination bonds with Co^(2+).This strategy is also effective in enhancing the oxidation tolerance of Ti_(3)C_(2)T_(x)to Fe^(2+)in H_(2)***,it is feasible to enhance the oxidation stability of Ti2CTx MXene in H_(2)O with the existence of Co^(2+).By virtue of these,the CoO/Ti_(3)C_(2)T_(x)composite was successfully prepared without obvious Ti_(3)C_(2)T_(x)oxidation,which is desirable to harness the advantages of Ti_(3)C_(2)T_(x)as the complementary component for lithium-ion *** work provides a straightforward paradigm to enhance the oxidation resistance of MXene in H_(2)O in the presence of transition metal ions and at high temperatures,which opens a new vista to use MXene for target applications.

关键词： hydrogen bonds N N-dimethyl formamide solvation structure stability Ti_(3)C_(2)T_(x)MXene transition metal ions

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Crustal and uppermost mantle structure of the northeastern Qinghai-Xizang Plateau from joint inversion of surface wave dispersions and receiver functions with P velocity constraints

引用

Earthquake Science 2024年第2期37卷 93-106页

作者： Pei zhang Xiaodong Song Jiangtao Li xingchen Wang Xuezhen zhang Institute of Geophysics China Earthquake AdministrationBeijing 100081China The Second Monitoring and Application Center China Earthquake AdministrationXi'an 710054China Institute of Theoretical and Applied Geophysics School of Earth and Space SciencesPeking UniversityBeijing 100871China Department of Geophysics School of Geodesy and GeomaticsWuhan UniversityWuhan 430079China

Lithospheric structure beneath the northeastern Qinghai-Xizang Plateau is of vital significance for studying the geodynamic processes of crustal thickening and expansion of the Qinghai-Xizang Plateau. We conducted a joint inversion of receiver functions and surface wave dispersions with P-wave velocity constraints using data from the Chin Array Ⅱ temporary stations deployed across the Qinghai-Xizang Plateau. Prior to joint inversion, we applied the H-κ-c method(Li JT et al., 2019) to the receiver function data in order to correct for the back-azimuthal variations in the arrival times of Ps phases and crustal multiples caused by crustal anisotropy and dipping interfaces. High-resolution images of vS, crustal thickness, and vP/vSstructures in the Qinghai-Xizang Plateau were simultaneously derived from the joint inversion. The seismic images reveal that crustal thickness decreases outward from the Qinghai-Xizang Plateau. The stable interiors of the Ordos and Alxa blocks exhibited higher velocities and lower crustal vP/vSratios. While, lower velocities and higher vP/vSratios were observed beneath the Qilian Orogen and Songpan-Ganzi terrane(SPGZ), which are geologically active and mechanically weak, especially in the mid-lower *** or thermal erosion of the lithosphere triggered by hot asthenospheric flow contributes to the observed uppermost mantle low-velocity zones(LVZs) in the SPGZ. The crustal thickness, vS, and vP/vSratios suggest that whole lithospheric shortening is a plausible mechanism for crustal thickening in the Qinghai-Xizang Plateau, supporting the idea of coupled lithospheric-scale deformation in this region.

关键词： joint inversion receiver functions surface waves crustal thickness vP/vS ratio NE Qinghai-Xizang Plateau

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Atomically dispersed Fe sites on hierarchically porous carbon nanoplates for oxygen reduction reaction

引用

Journal of Energy Chemistry 2024年第3期90卷 7-15,I0002页

作者： Ruixue Zheng Qinglei Meng Hao zhang Teng Li Di Yang Li zhang Xiaolong Jia Changpeng Liu Jianbing Zhu Xiaozheng Duan Meiling Xiao Wei xing State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026AnhuiChina Laboratory of Advanced Power Sources Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesJiangsu Key Laboratory of Advanced Negative Carbon TechnologiesSoochow UniversitySuzhou 215123JiangsuChina State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina

Developing cost-effective,robust and stable non-precious metal catalysts for oxygen reduction reaction(ORR) is of paramount importance for electrochemical energy conversion devices such as fuel cells and metal-air *** Fe-N-C single atom catalysts(SACs) have been hailed as the most promising candidate due to the optimal binding strength of ORR intermediates on the Fe-N_(4) sites,they suffer from serious mass transport limitations as microporous templates/substrates,i.e.,zeolitic imidazolate frameworks(ZIFs),are usually employed to host the active *** by this challenge,we herein develop a hydrogen-bonded organic framework(HOF)-assisted pyrolysis strategy to construct hierarchical micro/mesoporous carbon nanoplates for the deposition of atomically dispersed Fe-N_(4) *** a design is accomplished by employing HOF nanoplates assembled from 2-aminoterephthalic acid(NH_(2)-BDC) and p-phenylenediamine(PDA) as both soft templates and C,N *** from the structural merits inherited from HOF templates,the optimized catalyst(denoted as Fe-N-C SAC-950) displays outstanding ORR activity with a high half-wave potential of 0.895 V(*** hydrogen electrode(RHE)) and a small overpotential of 356 mV at 10 mA cm^(-2) for the oxygen evolution reaction(OER).More excitingly,its application potential is further verified by delivering superb rechargeability and cycling stability with a nearly unfading charge-discharge gap of 0.72 V after 160 *** dynamics(MD) simulations reveal that micro/mesoporous structure is conducive to the rapid mass transfer of O_(2),thus enhancing the ORR *** situ Raman results further indicate that the conversion of O_(2) to~*O_(2)-the rate-determining step(RDS) for Fe-N-C *** work will provide a versatile strategy to construct single atom catalysts with desirable catalytic properties.

关键词： Fe single atom catalysts Oxygen reduction reaction Mesoporous structure Active sites Zinc-air battery

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

根际细菌群落结构对黄瓜幼苗干旱胁迫的响应

引用

西南农业学报 2024年第1期37卷 92-100页

作者：王灿赵文麟张新梅许彬罗文解志强张应华许俊强云南农业大学/云南省滇台特色农业产业化工程研究中心昆明650201 文山州农业科学院云南文山663000 云南农业大学云南省蔬菜生物学重点实验室昆明650201

【目的】了解根际细菌群落结构和功能对黄瓜幼苗干旱胁迫的响应。【方法】采用盆栽控水法设置干旱处理D和正常处理N,利用Illumina NovaSeq测序技术测定黄瓜幼苗根际细菌群落结构和多样性。【结果】处理N的叶绿素和可溶性糖含量分别是2.... 详细信息

【目的】了解根际细菌群落结构和功能对黄瓜幼苗干旱胁迫的响应。【方法】采用盆栽控水法设置干旱处理D和正常处理N,利用Illumina NovaSeq测序技术测定黄瓜幼苗根际细菌群落结构和多样性。【结果】处理N的叶绿素和可溶性糖含量分别是2.440和10.380 mg/g,显著高于处理D的1.547和8.356 mg/g;处理D的脯氨酸和丙二醛含量分别为51.807μg/g和54.848 nmol/g,显著高于处理N的32.628μg/g和29.005 nmol/g;处理N的根系活力为32.670μg/(g·h),显著高于处理D的20.714μg/(g·h);处理N的SOD含量为324.826 U/g,显著低于处理D的578.363 U/g;黄瓜幼苗根际细菌群落中,门分类水平下丰度前5位的是变形菌门(Proteobacteria)、芽单胞菌门(Gemmatimonadota)、拟杆菌门(Bacteroidota)、酸杆菌门(Acidobacteria)和放线菌门(Ac⁃tinobacteriota);α多样性指数(Chao1、Shannon、Simpson)中各处理间无显著差异,但PCoA分析显示,两处理间细菌群落结构差异显著;处理N与处理D相比,芽单胞菌显著升高,而拟杆菌和厚壁菌则显著下降;LEfSe结果显示,处理D显著富集以拟杆菌门和厚壁菌门为主的Muribaculaceae、梭菌纲(Clostridia)、芽孢杆菌纲(Bacilli)等有益细菌;根际细菌群落功能分析发现,处理D显著增加RNA加工和修饰、染色质结构和动力学、转录、氨基酸运输和代谢、碳水化合物的运输和代谢等相关功能的丰度,并上调与硫胺素等次级代谢物相关的合成途径及以糖类、氨基酸为主的降解代谢途径。【结论】干旱胁迫对黄瓜幼苗根际细菌群落结构有显著影响,促进根际土壤中以拟杆菌和厚壁菌为主的有益微生物显著富集,并对其细菌群落生命活动产生诱导和促进作用,使与硫胺素等次级代谢物相关的合成途径和以糖类、氨基酸为主的降解代谢途径丰度显著上调。以期为挖掘在干旱胁迫下对黄瓜秧苗生长可能有正向作用的土壤有益菌互作机制研究提供新思路。

关键词：黄瓜幼苗干旱胁迫根际细菌群落结构

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于集对分析的用水定额评估方法及应用

引用

水电能源科学 2024年第9期42卷 194-198页

作者：张欣张保祥吴振山东省水利科学研究院山东济南250014 山东省水资源与水环境重点实验室山东济南250014

为深入贯彻落实“四水四定”原则,提升水资源节约集约安全利用水平,建立由覆盖性评估、规范性评估、合理性评估、先进性评估和实用性评估构成的用水定额评估指标体系及分级标准。基于集对分析理论构建用水定额评估模型,采用五元减法集... 详细信息

为深入贯彻落实“四水四定”原则,提升水资源节约集约安全利用水平,建立由覆盖性评估、规范性评估、合理性评估、先进性评估和实用性评估构成的用水定额评估指标体系及分级标准。基于集对分析理论构建用水定额评估模型,采用五元减法集对势识别出较差的单指标。将该方法应用于我国华北缺水地区典型工业行业用水定额评估中,结果表明,山东省医药制造业重点工业产品用水定额总体评估结果为“宽松”,行业类别覆盖比例等7个指标的集对势处于反势或偏反势,可作为用水定额修订需要重点完善的内容。基于集对分析的用水定额评估方法系统实用,克服了评估指标覆盖不全面的缺陷,可以给出用水定额合理客观的评估结论,对于确保用水定额始终满足节水管理的需求具有重要意义。

关键词：典型工业行业用水定额评估评估指标体系集对分析五元减法集对势

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Electrolytes additives for Zn metal anodes:regulation mechanism and current perspectives

引用

Rare Metals 2024年第9期43卷 4162-4197页

作者： Yu-Zhe zhang Huai-Sheng Ao Qi Dong Shao-Jie zhang Zhi-Guo Hou Na-Na Wang Xue-Song Xie Jian Rong Zhong-Yu Li School of Environmental Science and Engineering Changzhou UniversityChangzhou 213164China School of Petrochemical Engineering Changzhou UniversityChangzhou 213164China Hefei National Laboratory for Physical Science at Microscale School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsInnovation CampusUniversity of WollongongNorth WollongongNSW 2500Australia Department of Chemical and Materials Engineering University of AlbertaEdmonton AB T6G 1H9Canada

With distinct advantages such as high gravimetric and volumetric capacity(5855 mAh·cm^(-3)and 820mAh·g^(-1)),low redox potential(-0.762 V *** hydrogen electrode(SHE)),high abundance,low toxicity and intrinsic safety of Zn metal anode,Zn-ion batteries have become a potential alternative to Li-ion ***,several challenges still need to be addressed prior to the practical applications of Zn-ion batteries,such as dendrite growth during Zn plating/stripping and interfacial side reactions on the Zn *** issues can be addressed by introducing additives to regulate the components and structures of the *** this review,we systematically discussed the core issues of metallic Zn anodes and comprehensively summarized a novel perspective of the regulation mechanism of inhibiting dendrite growth or interfacial side reactions in Zn anodes by introducing additives into aqueous ***,some discussions and prospects for aqueous Zn ion batteries(AZIBs)are presented for future research.

关键词： Electrolyte additives Zn metal anode Regulation mechanism Current perspectives AZIBs

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

灰霉病早期胁迫下花椰菜多酚氧化酶活性的高光谱研究

引用

光谱学与光谱分析 2024年第2期44卷 534-541页

作者：王凯薛建新李尧迪张明月山西农业大学农业工程学院山西晋中030801

利用高光谱技术实现灰霉病早期胁迫下花椰菜多酚氧化酶(PPO)活性的快速无损检测。为了使预测效果更好,在900~1700 nm光谱范围内采集253个健康花椰菜样本及257个染病花椰菜样本的光谱信息,并使用分光光度计法对样本中多酚氧化酶活性进行... 详细信息

利用高光谱技术实现灰霉病早期胁迫下花椰菜多酚氧化酶(PPO)活性的快速无损检测。为了使预测效果更好,在900~1700 nm光谱范围内采集253个健康花椰菜样本及257个染病花椰菜样本的光谱信息,并使用分光光度计法对样本中多酚氧化酶活性进行测定。对健康及染病花椰菜样本PPO活性均值进行分析,发现健康花椰菜PPO活性均值(10.257 U·g^(-1))小于染病花椰菜PPO活性均值(12.324 U·g^(-1))。利用光谱-理化值共生距离(SPXY)算法对样本进行校正集(健康样本193个,染病样本197个)和预测集(健康样本60个,染病样本60个)的划分,对划分后的样本集进行六种单一预处理(卷积平滑算法SG、去趋势算法DT、中值滤波MF、归一化处理NOR、标准正态变量变换SNV、基线校正Baseline)。利用相关系数(R)和均方根误差(RMSE)作为模型评价指标,发现预处理能够有效提高模型的精度和稳定性,其中健康样本经NOR预处理后的预测集建模效果最好;染病样本经DT预处理后的预测集建模效果最好。采用连续投影算法(SPA)与回归系数法(RC)提取特征波长,建立PPO活性值的偏最小二乘回归(PLSR)、最小二乘支持向量机(LS-SVM)及BP神经网络三种预测模型,探究不同特征波长提取方法对模型精度的影响,比较不同建模方式对花椰菜PPO活性预测的准确度。结果说明提取特征波长可以优化光谱信息,SPA和RC对两种样本提取的波长个数分别为9,12,7和11,其中SPA优化后的光谱数据对健康样本PPO活性预测效果较好,RC优化后的光谱数据对染病样本PPO活性预测效果较好。对比分析模型效果,发现LS-SVM模型对两种样本和其对应的酶活性产生了很好的拟合效果。最终发现,SPA-LS-SVM模型对于健康花椰菜PPO活性预测效果较好,其预测相关系数(Rp)为0.832,预测均方根误差(RMSEP)为1.676;RC-LS-SVM模型对于染病花椰菜PPO活性预测效果较好,其Rp为0.848,RMSEP为1.156。研究结果表明高光谱技术可以实现灰霉病早期胁迫下花椰菜多酚氧化酶活性的测定,为快速检测花椰菜多酚氧化酶活性及便携式仪器开发提供了科学依据。

关键词：花椰菜灰霉病多酚氧化酶高光谱无损检测

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nanoindentation behavior and creep-induced cracking of long-term crept austenitic steel at 650℃

引用

Journal of Iron and Steel Research International 2024年第2期31卷 464-474页

作者： Zhen zhang Yu-hang Duan Shuai Wang Jin-shan Chen An-zhe Wang Xiang-yang Mao Yuan-ji Shi Jie zhang Ming Liu Zheng-fei Hu School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing211167JiangsuChina Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing211167JiangsuChina Jiangsu Wind Power Engineering Technology Center Nanjing210023JiangsuChina Nanjing Vocational University of Industry Technology Nanjing210023JiangsuChina Baoshan Iron&Steel Co. Ltd.Shanghai201900China Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou350116FujianChina School of Materials Science and Engineering Tongji UniversityShanghai201804China

The grain boundary(GB)damage of long-term crept HR3C(25Cr–20Ni–Nb–N)austenitic steel with solid solution state was investigated by nanoindentation test accompanied with in-situ electron back-scattered *** corresponding microstructure was characterized by scanning electron microscopy and transmission electron *** show that the increase in nanoindentation hardness at the GBs and triple grain junctions may be related to the dislocation accumulation and carbide growth during the *** M23C6 and dislocations piling-up at the GB accelerate the nucleation and coalescence of creep cavity along the *** nanoindentation hardness in grains varies with orientation of the stress *** orientation difference of neighbor grains may induce local high geometrically necessary dislocation densities and strain gradients near the GB,consequently causing stress concentration and subsequent crack growth at specific GBs.

关键词： Austenitic steel Creep Nanoindentation Grain orientation Creep-induced cracking

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Magnetic-Driven Multi-motion Robot with Position/Orientation Sensing Capability

引用

Research 2024年第1期2023卷 675-685页

作者： Liwen zhang Song Zhao xinzhao Zhou Xueshan Jing Yu Zhou Yan Wang Yantong Zhu Xiaolin Liu Zehui Zhao Deyuan zhang Lin Feng Huawei Chen School of Mechanical Engineering and Automation Beihang UniversityBeijingChina Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijingChina

Miniature magnetic-driven robots with multimode motions and high-precision pose sensing capacity(position and orientation)are greatly demanded in in situ manipulation in narrow opaque enclosed *** magnetic robots have been carried out,whereas their deformations normally remain in single mode,and the lack of the robot’s real-time status leads to its beyond-sight remagnetization and manipulation being *** function integration of pose sensing and multimode motion is still of ***,a multimotion thin-film robot is created in a novel multilayer structure with a magneticdriven layer covered by a heating-sensing conductive *** a heating-sensing layer not only can segmentally and on-demand heat the magnetic-driven layer for in situ magnetization reprogramming and multimode motions but also can precisely detect the robot’s pose(position and orientation)from its electrical-resistance effect by creating a small deformation under preset magnetic fields.

关键词： robot Robot motion

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Interface optimization of graphene paper-Cu composite prepared by electrodeposition

引用

Journal of Iron and Steel Research International 2024年第1期31卷 64-73页

作者： Jing Guo Hai-jing Wang Shuang-juan Liu Peng zhang Jing-yu Tang Wei-yang zhang Han-jie Guo Peng-cheng Wang Cai Meng School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Advanced Technology and Materials Co. Ltd.Beijing100083China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei230027AnhuiChina

A room-temperature electrodeposition method with an organic electrolyte was developed to fabricate a HNO3-pretreated graphene paper Cu(GP'-Cu)*** improve the interfacial bonding of GP'-Cu composite,magnetron sputtering technology was used to create a"sandwich"structural gradient GP'-Cu *** selection of the intermediate transition layer metal was based on two-dimensional *** electron microscopy,X-ray photoelectron spectroscopy,and other analytical methods confirmed that the addition of an intermediate transition metal(Cr,Ni)layer reduced the gap distance and enhanced the interfacial bonding of the GP'and Cu deposited *** GP'-Ni-Cu composite exhibited the largest increase in tensile strength and *** addition,it had the highest thermal diffusivity and elongation at break among the GP'-Cu,GP'-Cr-Cu and GP'-Ni-Cu composites.

关键词： Graphene paper Two-dimensional disregistry Magnetron sputtering Metal composite

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：