检索结果-南通市图书馆

Chinese Chemical Letters 1996年第4期7卷 385-386页

作者： Zhou X.Z. Xie W.H. xu s.s. Department of Chemisty Nankai University Tianjin 300071

Me2GeGeMe2)[(η￣5-C_5H_4)Fe(CO)]_2(μ-CO)_2, 1 undergoes a novel reaction between its Ge-Ge and Fe-Fe bonds, forming a rearrangement product with a new cyclic structure,[Me_2Ge(η￣5- C_5H_4)Fe(CO)_2]_2, 2, which was...

关键词：

Twinning aspects and their efficient roles in wrought Mg alloys:A comprehensive review

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

Journal of Magnesium and Alloys 2024年第6期12卷 2201-2230页

作者： s.s.A.shah Manping Liu Azim Khan Farooq Ahmad M.R.Abdullah Xingquan Zhang shiwei xu Zhen Peng school of Materials.s.ience and Engineering Jiangsu UniversityZhenjiang 212013China school of Mechanical Engineering Anhui University of TechnologyMáanshan 243002China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China

Twinning is widely recognized as an effective and cost-efficient method for controlling the microstructure and properties of wrought magnesium(Mg)***,twins play a crucial role in initiating dynamic recrystallization(DRX),while twin regions experience rapid recrystallization during static recrystallization(sRX).The activation of twinning can lead to changes in lattice orientation,significantly impacting the final texture in Mg *** active roles of twinning are influenced by various factors during the activation process,and the mobility of twin boundaries(TB)can be amplified by stress effects,dislocation interactions,and thermal ***,annealing treatments that involve proper segregation or precipitation on TBs.s.rve to stabilize them,restraining their *** such as.s.gregation may also alter the twinning propensity in Magnesium-rare earth(Mg-RE)***{10–11}contraction twins(CT)and{10–11}-{10–12}double twins(DT)can promote dynamic recrystallization(DRX),they also pose a risk as potential sources of voids and ***,understanding the nucleation and growth mechanis.s.of twinning is crucial,and these aspects are briefly reviewed in this *** the factors mentioned above,this article summarizes the recent research progress in this field,shedding light on advancements in recent eras.

关键词： Mg alloys Twinning Recrystallization Texture Mechanical properties

An Integral Method for solving Dynamic Equations with Fluid–solid Coupling

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica solida sinica 2024年第1期37卷 99-108页

作者： Xin Zhang Jie Liu Pu xue shuowen Yan Yahao xu M.s.Zahran school of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China school of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China Department of Civil Engineering Military Technical CollegeCairo 11435Egypt

In this work,a new methodology is presented to mainly solve the fluid–solid interaction(FsI)*** methodology combines the advantages of the Newmark precise integral method(NPIM)and the dual neural network(DNN)*** NPIM is employed to modify the exponential matrix and loading vector based on the DNN integral *** involves incorporating the basic assumption of the Newmark-βmethod into the dynamic equation and eliminating the acceleration term from the dynamic equilibrium *** a result,the equation is reduced to a first-order linear equation ***,the PIM is applied to integrate the s.s.em step by step within the *** DNN method is adopted to solve the inhomogeneous term through fitting the integrand and the original function with a pair of neural networks,and the integral term is.s.lved using the Newton–Leibniz *** examples demonstrate that the proposed methodology significantly improves computing efficiency and provides.s.fficient precision compared to the DNN *** is particularly evident when analyzing large-scale structures under blast loading conditions.

关键词： Newmark precise integral method(NPIM) Dual neural networks(DNN) Fluid-solid interaction(FsI) Dynamic time-history analysis Blast loading

Investigation and optimization of high-valent Ta-doped srFeO_(3-δ)as air electrode for intermediate-temperature solid oxide fuel cells

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

International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2102-2109页

作者： shanshan Jiang Hao Qiu shaohua xu Xiaomin xu Jingjing Jiang Beibei Xiao Paulo sérgio Barros Juliao) Chao su Daifen Chen Wei Zhou school of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212100China WA school of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityPerth WA6102Australia Institute of Analys.s.and Testing Beijing Academy of Science and TechnologyBeijing 100089China state Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China

To explore highly active and thermomechanical stable air electrodes for intermediate-temperature solid oxide fuel cells(ITsOFCs),10mol%Ta5+doped in the B site of strontium ferrite perovskite oxide(srTa_(0.1)Fe_(0.9)O_(3-δ),sTF)is investigated and *** effects of Ta^(5+)doping on structure,transition metal reduction,oxygen nonstoichiometry,thermal expansion,and electrical performance are evaluated *** 10mol%Ta^(5+)doping,the thermal expansion coefficient(TEC)decreased from 34.1×10^(-6)(srFeO_(3-δ))to 14.6×10^(-6) K^(-1)(sTF),which is near the TEC of electrolyte(13.3×10^(-6) K^(-1) for sm_(0.2)Ce_(0.8)O_(1.9),sDC),indicates excellent thermomechanical *** 550-750℃,sTF shows.s.perior oxygen vacancy concentrations(0.262 to 0.331),which is critical in the oxygen-reduction reaction(ORR).Oxygen temperature-programmed desorption(O_(2)-TPD)indicated the thermal reduction onset temperature of iron ion is around 420℃,which matched well with the inflection points on the thermos-gravimetric analys.s.and electrical conductivity *** 600℃,the sTF electrode shows area-specific res.s.ance(AsR)of 0.152Ω·cm^(2) and peak power density(PPD)of 749 mW·cm^(-2).ORR activity of sTF was further improved by introducing 30wt%sm_(0.2)Ce_(0.8)O_(1.9)(sDC)powder,sTF+sDC composite cathode achieving outstanding AsR value of 0.115Ω·cm2 at 600℃,even comparable with benchmark cobalt-containing cathode,Ba_(0.5)sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)(BsCF).Distribution of relaxation time(DRT)analys.s.revealed that the oxygen surface exchange and bulk diffusion were improved by forming a composite *** 650℃,sTF+sDC composite cathode achieving an outstanding PPD of 1117 mW·cm^(-2).The excellent results.s.ggest that sTF and sTF+sDC are promising air electrodes for IT-sOFCs.

关键词： strontium ferrite-based perovskite Ta doping composite cathode intermediate-temperature solid oxide fuel cells

Electrically-driven ultrafast out-of-equilibrium light emission from hot electrons in s.s.ended graphene/hBN heterostructures

在线全文

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2024年第1期6卷 328-338页

作者： Qiang Liu Wei xu Xiaoxi Li Tongyao Zhang Chengbing Qin Fang Luo Zhihong Zhu shiqiao Qin Mengjian Zhu Kostya s Novoselov College of Advanced Interdisciplinary studies&Hunan Provincial Key Laboratory of Novel Nano-optoelectronic Information Materials and Devices National University of Defense TechnologyChangshaHunan 410073People’s Republic of China Nanhu Laser Laboratory National University of Defense TechnologyChangshaHunan 410073People’s Republic of China state Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006People’s Republic of China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006People’s Republic of China state Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006People’s Republic of China Institute for Functional Intelligent Materials National University of SingaporeSingapore 117544Singapore Department of Materials.s.ience and Engineering National University of SingaporeSingapore 117575Singapore

Nanoscale light sources with high speed of electrical modulation and low energy consumption are key components for nanophotonics and *** record-high carrier mobility and ultrafast carrier dynamics of graphene make it promising as an atomically thin light emitter which can be further integrated into arbitrary platforms by van der Waals ***,due to the zero bandgap,graphene is difficult to emit light through the interband recombination of carriers like conventional ***,we demonstrate ultrafast thermal light emitters based on s.s.ended graphene/hexagonal boron nitride(Gr/hBN)*** in biased graphene are significantly heated up to 2800 K at modest electric fields,emitting bright photons from the near-infrared to the visible spectral *** eliminating the heat dissipation channel of the substrate,the radiation efficiency of the s.s.ended Gr/hBN device is about two orders of magnitude greater than that of graphene devices.s.pported on siO2or *** demonstrate that hot electrons and low-energy acoustic phonons in graphene are weakly coupled to each other and are not in full thermal *** cooling ofhigh-temperature hot electrons to low-temperature acoustic phonons is enabled by the significant near-field heat transfer at the highly localized Gr/hBN interface,resulting in ultrafast thermal emission with up to 1 GHz bandwidth under electrical *** is found thats.s.ending the Gr/hBN heterostructures on the siO2trenches.s.gnificantly modifies the light emission due to the formation of the optical cavity and showed a~440%enhancement inintensity at the peak wavelength of 940 nm compared to the black-body thermal *** demonstration of electrically driven ultrafast light emission from s.s.ended Gr/hBNheterostructures.s.eds the light on applications of graphene heterostructures in photonicintegrated circuits.s.ch as broadband light sources and ultrafast thermo-optic phase modulat

关键词： s.s.ended graphene ultrafast light emitter van der Waals heterostructures thermal radiation electron–phonon interaction

Distinguishing Concrete-way from Grassplot with MMW Band

在线全文

学校读者我要写书评

暂无评论

Distinguishing Concrete-way from Grassplot with MMW Band

The DUF579 proteins GhIRX15s regulate cotton fiber development by interacting with proteins involved in xylan synthesis

IEEE 2005 International symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

作者： Z.L. Xiao, J.Z. xu, s.s. Peng, s.X. Mou MMW Appli. Lab. , Elec.Eng. Depart, Nanjing Univ. of sci. & Techn., Nanjing, Jiangsu P.R.C 210094

The engineering design of a millimeter-wave (MMW) active/passive (A/P) combinative detector have previously been presented in the reference [1], and in this paper, application in concrete-way detectin

关键词： MMW, concrete-way detecting, experiment

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The Crop Journal 2024年第4期12卷 1112-1125页

作者： Mengyun Li Feng Chen Jingwen Luo Yanan Gao Jinglong Cai Wei Zeng Monika s.Doblin Gengqing Huang Wenliang xu Hubei Key Laboratory of Genetic Regulation and Integrative Biology School of Life SciencesCentral China Normal UniversityWuhan 430079HubeiChina Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation School of Life SciencesTaizhou UniversityTaizhou 318000ZhejiangChina La Trobe Institute for s.s.ainable Agriculture&Food School of AgricultureBiomedicine and EnvironmentLa Trobe UniversityBundooraVIC 3086Australia

Cotton provides the most abundant natural fiber for the textile *** mature cotton fiber largely cons.s.s of secondary cell walls with the highest proportion of cellulose and a small amount of hemicellulose and *** dissect the roles of hemicellulosic polysaccharides during fiber development,four IRREGULAR XYLEM 15(IRX15)genes,GhIRX15-1/-2/-3/-4,were functionally characterized in *** genes encode DUF579 domain-containing proteins,which are homologs of AtIRX15 involved in xylan *** four GhIRX15 genes were predominantly expressed during fiber secondary wall thickening,and the encoded proteins were localized to the Golgi *** GhIRX15 gene could restore the xylan deficient phenotype in the Arabidops.s.irx15irx15l double *** of GhIRX15s in cotton resulted in shorter mature fibers with a thinner cell wall and reduced cellulose content as compared to the wild ***,GhIRX15-2 and GhIRX15-4 formed homodimers and *** addition,the GhIRX15s.s.owed physical interaction with glycosyltransferas.s.GhGT43C,GhGT47A and GhGT47B,which are responsible for synthes.s.of the xylan backbone and reducing end ***,the GhIRX15s can form heterocomplexes with enzymes involved in xylan modification and side chain synthes.s.such as GhGUX1/2,GhGXM1/2 and *** findings.s.ggest that GhIRX15s participate in fiber xylan biosynthes.s.and modulate fiber development via forming large multiprotein complexes.

关键词： Cotton fiber Xylan biosynthesis GhIRX15s Protein-protein interaction Protein complexes

Riverine sulfate sources and behaviors in arid environment,Northwest China:Constraints from sulfur and oxygen isotopes

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental sciences 2024年第3期137卷 716-731页

作者： Yifu xu Wenjing Liu Bing xu Zhifang xu Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of sciences Beijing 100049China

The fate of riverine sulfate ion (sO_(4)^(2-)) and its environmental effects in arid environment are difficult to evaluate due to its complicated sources and strongly coupled behaviors with water cycle which is.s.gnificantly modified by *** understand the sulfur cycle in aquatic s.s.ems in arid environment,the chemical and sulfur and oxygen isotopic compositions (δ^(34)s_(sO4)and δ^(18)O_(sO4)) of major rivers around the Badain Jaran Desert,northwestern China,were *** rivers had averaged sO_(4)^(2-)content at 1336μmol/L,over 10times higher than the global *** δ^(34)s_(sO4)and δ^(18)O_(sO4)values ranged from-5.3‰to+11.8‰and+1.6‰to+12.8‰,*** end-member analys.s.and the inverse model showed that riverine sulfate was mainly derived from evaporites dissolution (0-87%),sulfide oxidation (13%-100%) and precipitation (0-33%),indicating heterogeneity in sulfur sources and behaviors along the river drainage with the lithology variations and climate *** isotopic tools combining with hydro-chemistry compositions could be applied to reveal sulfur cycle in arid *** on the calculation,sulfide oxidation plays the primary role in the headwater and upstream in the Qilian-Mountains area,where sulfide is widely *** the proportion of evaporites dissolution contributing to riverine sulfate is much higher in downstream in a drier ***,less precipitation and higher temperature can lead to more intensive evaporation,affecting the process of sulfide oxidation and enhancing the rates of evaporites dissolution and sulfate precipitation in the basin.

关键词： sulfur and oxygen isotopes source apportionment Inverse model Arid environment Inland rivers Northwestern China

Big Model strategy for Bridge structural Health Monitoring Based on Data-Driven, Adaptive Method and Convolutional Neural Network (CNN) Group

在线全文

学校读者我要写书评

暂无评论

structural Durability & Health Monitoring 2024年第6期18卷 763-783页

作者： Yadong xu Weixing Hong Mohammad Noori Wael A.Altabey Ahmed silik Nabeel s.D.Farhan Nanjing Highway Development Center Changzhou211106China Nanjing Zhixing Information Technology Co. Ltd.Nanjing210000China Department of Mechanical Engineering California Polytechnic State UniversitySan Luis ObispoCA 93405USA Department of Mechanical Engineering Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt Department of Civil Engineering Nyala UniversityP.O.Box 155NyalaSudan school of Civil Engineering University of LeedsLeedsLS29JTUK

This.s.udy introduces an innovative“Big Model”strategy to enhance Bridge structural Health Monitoring(sHM)using a Convolutional Neural Network(CNN),time-frequency analys.s.and fine element *** ensemble methods,collaborative learning,and distributed computing,the approach effectively manages the complexity and scale of large-scale bridge *** CNN employs transfer learning,fine-tuning,and continuous monitoring to optimize models for adaptive and accurate structural health ass.s.ments,focusing on extracting meaningful features through time-frequency *** integrating Finite Element Analys.s.time-frequency analys.s.and CNNs,the strategy provides a comprehensive understanding of bridge *** diverse sensor data,sophisticated feature extraction,and advanced CNN architecture,the model is optimized through rigorous preprocessing and hyperparameter *** approach significantly enhances the ability to make accurate predictions,monitor structural health,and support proactive maintenance practices,thereby ensuring the safety and longevity of critical infrastructure.

关键词： structural Health Monitoring(sHM) bridges big model Convolutional Neural Network(CNN) Finite Element Method(FEM)

Aldehyde oxidase mediated enantioselective metabolic health risk of dinotefuran

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

science China Chemistry 2024年第6期67卷 2079-2091页

作者： Liwei xu Xinxin xu Hua Kuang Chuanlai xu Xiaoling Wu state Key Laboratory of Food science and Resources Jiangnan UniversityWuxi214122China International Joint Research Laboratory for Biointerface and Biodetection and school of Food science and Technology Jiangnan UniversityWuxi214122China Collaborative Innovation center of Food safety and Quality Control in Jiangsu Province Jiangnan UniversityWuxi214122China

Chiral pollutants often pose significant differential environmental health *** this.s.udy,the biotransformation of chiral dinotefuran(DIN)and its enantioselective metabolic toxicity mechanis.s.have been s.s.emically ***,reversedphase chromatography-high resolution mass.s.ectrometry was developed to quantify the content of DIN R/s chiral enantiomer with pg level sensitivity,revealing a lower elimination rate constant(K_(e))of s-DIN(0.730 h^(-1))than R-DIN(0.746 h^(-1)).secondly,the interaction mechanism between DIN metabolism and important endogenous bioactive molecules.s.ch as aldehyde oxidase(AOX)and neurotransmitters,was *** DIN nitro-group was converted into a guanidine group by the reducing site of nearby flavin adenine dinucleotide(FAD)in AOX with the preferred higher affinity of ***,the endogenous tryptophan(Trp)aldehyde metabolic intermediate,5-hydroxyindoleacetaldehyde(5-HIAL),provides a pers.s.ent electron donor for DIN reduction via the oxidation-catalyzed site in AOX,resulting in remarkable up-regulation of monoamine neurotransmitters.s.ch as.s.rotonin and ***,the higher level of neurotransmitters further mediated dysregulation of oxylipin homeostas.s.via the serotonergic pathway,where s-DIN exhibited more pronounced liver lipid damage and environmental health risk with the accumulated lipid biomarkers,oxidized triglyceride(OxTG)and oxidized sphingomyelin(OxsM).This.s.udy elucidates the AOX-mediated enantioselectivity metabolic pathway of DIN,providing a new analytical method for chiral pollutants and paves the way for their health risk ass.s.ments.

关键词： neonicotinoid dinotefuran enantiomer aldehyde oxidase metabolomics health risk