检索结果-南通市图书馆

同方期刊数据库

Mossbauer,optical and structural properties of Fe^(3+) ion in borate glass

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2025年第1期43卷 162-170,I0006页

作者： Essam A.Elkelany hesham y.Amin A.Samir M.M.EL-hady h.h.El-Bahnasawy Moukhtar A.hassan Basic Science Department Faculty of EngineeringSinai UniversityAl-Arish45511Egypt School of Information and Electrical Engineering Hangzhou City UniversityHangzhou30015China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou310027China Basic Science Department Faculty of Engineering at ShoubraBenha University11629Egypt Physics Department Faculty of ScienceAl-Azhar University11884CairoEgypt

Lanthanum-bearing iron lithium borate glass is a quaternary system for oxide glasses and was prepared via the melt-quenching *** present article correlates the structure,optical,ligand field and M?ssbauer data on iron lithium borate glass co ntaining La^(3+).The density was measured,while the molar volume was *** physical parameters are *** increasing the La_(2)O_(3) content within the glass network,infrared spectra analysis reveals structural modifications such as the increase in BO_(4) units and the decline in both BO_(3) units and NBO bonds ***,optical absorption spectra were *** absorption spectra disclose a plethora of electronic transitions that are related to Fe^(3+)in tetrahedral and octahedral sites,however,Fe^(2+)phase is not observed in optical spectra,but it has a clear signature in M?ssbauer ***,the glass absorption edges undergo a clear blue shift,reflecting an increased band gap energy(1.96-2.28 eV).The decline in NBO bonds justifies this ***,the values of crystal field splitting are increased,while the values of Racah parameters are *** trend is justified by the decline in NBO bonds and increases electron localization around Fe cations.M?ssbauer spectra confirm the existence of Fe^(3+)in tetrahedral and octahedral sites,while Fe^(2+)exists in only a tetrahedral *** increasing La_(2)O_(3) content,the isomer shift of Fe^(3+)in tetrahedral sites changes to be 0.312-0.329 mm/s,while the isomer shift of octahedral Fe^(3+)is 0.424-0.456 mm/*** findings coincide with optical *** the isomer shift of tetrahedral Fe^(2+)is 0.902-0.911 mm/*** results of structural,optical and ligand field associated with M?ssbauer spectra open more vistas toward the utility of these samples in the optics realm.

关键词： Fe3+ions Rare-earth oxide Mossbauer spectra Ligand field parameters Optical properties

维普期刊数据库

New poly-types of LPSO structures in a non-equilibrium Mg_(97)Zn_(1)y_(1.6)Ca_(0.4)alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2025年第1期22卷 83-89页

作者： Qian-qian Jin Zi-hui Tang Wen-long Xiao Xiu-yu Qu Xu-hao han lin Mei Xiao-hong Shao Xiu-liang Ma School of Biological and Chemical Engineering Guangxi University of Science and TechnologyLiuzhou 545006GuangxiChina Center for the Structure of Advanced Matter School of Electronic EngineeringGuangxi University of Science and TechnologyLiuzhou 545006GuangxiChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Bay Area Center for Electron Microscopy Songshan Lake Materials LaboratoryDongguan 523808GuangdongChina

In this study,a comprehensive analysis of microstructural features,morphology,crystal structures,and interface structures of long-period stacking ordered(LPSO)structures in a non-equilibrium Mg_(97)Zn_(1)y_(16)Ca_(0.4)alloy cast in a steel mold was carried *** addition of Ca element plays an important role in the refinement of LPSO *** result reveals new poly-types including 20h F2F2F4,60R(F2F3F3)_(3),and 66h F2F3F3F2(F6)_(4)featuring a 6-Mg structure,alongside the prevalent 18R and 14h LPSO *** incoherent interface between 20h and the Mg matrix is split into two dislocation arrays,leading to the formation of a segment of 60R_(1).Moreover,the superstructure 116L,designated as(F2)_(18)F4,is formed through the ordered distribution of F4 stacking faults in 18R.

关键词： LPSO structures crystal structure Mg alloys heterogeneous interface

维普期刊数据库

high-dense nanocrystalline W-based alloy prepared by hot isostatic pressing with uniform microstructure, ultrahigh hardness and good thermal stability

在线全文

学校读者我要写书评

暂无评论

Tungsten 2025年第1期7卷 120-136页

作者： Zao-Ming Wu lin he lin-Sen ye Xiao-Feng yang Jia-Jia Zhang hong-Bo Lei Institute of Materials China Academy of Engineering Physics

high-density uniform microstructure nanocrystalline W-10wt.% Cr-5wt.% y（W-10Cr-5y） alloy with an average grain size of 85 nm and a relative density of 99.8% was successfully prepared.W-Cr-y alloys with different amounts of second-phase particles were prepared by high-energy ball milling and hot isostatic pressing *** effects of composition design,ball milling parameters,and sintering parameters on the microstructure of W-Cr-y alloys were studied.A feasible technology for controlling the synthesis of high-density nanocrystalline W-based alloys has been *** microstructure analysis of nanocrystalline W-10Cr-5y alloy shows that there are two types of doping in the second phase:intergranular doping and intragranular *** "uniform distribution yOx-rich particles" effectively suppresses the grain growth of W and leads to the formation of nanocrystalline W-10Cr-5y alloy.W-10Cr-5y has an ultra-high hardness,with a Vickers hardness of 1312±12 kgf·***-temperature annealing treatment shows that W-10Cr-5y has good thermal stability at 1000 and1100℃,as demonstrated by the comparison of Vickers hardness and grain size between annealed and unannealed alloys.

关键词： hot isostatic pressing Microstructure Nanocrystalline tungsten Thermal stability Vickers hardness

Turbulent Agglomeration of Microparticles in a Cylinder Wake Flow Using LES-DEM:Focusing on the Effect of the Reynolds Number

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2025年第1期34卷 34-49页

作者： WANG Shuang MU lin LI Xue XIE Jun DONG Ming School of Energy and Power Engineering Dalian University of TechnologyDalian 116024China School of Optical Information and Energy Engineering Wuhan Institute of TechnologyWuhan 430205China School of Energy and Environment Shenyang Aerospace UniversityShenyang 110136China

Turbulent agglomeration is viewed as a promising technology for enhancing fine particle removal *** better understand particle transport,agglomeration behaviors,and fluid-particle interactions,we numerically explored these phenomena under cylindrical vortex wake influence using a coupled large eddy simulation and discrete element method(LES-DEM)*** validity of the LES approach was verified by comparison with available direct numerical simulation(DNS)*** adopted the Johnson-Kendall-Roberts(JKR)contact model for particle-particle *** particle dispersion and agglomeration characteristics of particles with different diameters(d_(p)=2-20μm)in the laminar and transition of shear layer(TrSL)flow regimes were *** particles were concentrated at the vortex centers,while larger particles accumulated around the *** agglomeration efficiency exhibited an M-shaped profile spanwise(y-direction).With increasing Reynolds number,the agglomeration efficiency and turbulence intensity *** particle agglomeration efficiency peaks at a certain Reynolds ***,at higher Reynolds numbers,reducing the residence time of particles in the flow field decreases the agglomeration efficiency.

关键词： microparticle particle agglomeration discrete element method large eddy simulation

维普期刊数据库

Predictor−corrector inverse design scheme for property−composition prediction of amorphous alloys

在线全文

学校读者我要写书评

暂无评论

中国有色金属学报 2025年第1期35卷 169-183页

作者： Tao LONG Zhi-lin LONG Bo PANG School of Mechanical Engineering and Mechanics Xiangtan UniversityXiangtan 411105China School of Civil Engineering Xiangtan UniversityXiangtan 411105China

In order to develop a generic framework capable of designing novel amorphous alloys with selected target properties,a predictor−corrector inverse design scheme(PCIDS)consisting of a predictor module and a corrector module was presented.A high-precision forward prediction model based on deep neural networks was developed to implement these two *** utmost importance,domain knowledge-guided inverse design networks(DKIDNs)and regular inverse design networks(RIDNs)were also *** forward prediction model possesses a coefficient of determination(R^(2))of 0.990 for the shear modulus and 0.986 for the bulk modulus on the testing ***,the DKIDNs model exhibits superior performance compared to the RIDNs *** is finally demonstrated that PCIDS can efficiently predict amorphous alloy compositions with the required target properties.

关键词： amorphous alloys machine learning deep neural networks inverse design elastic modulus

highly Oxidized Molecules Make a Significant Contribution to Enhanced Aromatic-Derived Secondary Organic Aerosol under a humid Environment

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

ADVANCES IN ATMOSPhERIC SCIENCES 2025年第4期42卷 641-652页

作者： yang, Zhaomin Li, Kun Du, lin Shandong Univ Environm Res Inst Qingdao 266237 Peoples R China

Enhanced mass concentrations of aromatic-derived secondary organic aerosol (SOA) are frequently observed during humid-haze events. however, the influencing mechanism of relative humidity (Rh) in aromatic-derived SOA formation remains incompletely understood. here, the Rh dependence of SOA formation in the presence of NOx was explored by a series of chamber experiments for toluene (TOL) and 1,3,5-trimethylbenzene (TMB) photooxidation. The yield of TOL SOA and TMB SOA increased by 221% and 52% with increasing Rh from similar to 8% to similar to 70%, respectively. Analytical results from a high-resolution mass spectrometer showed that SOA constituents with high oxygen content (O/C > 0.6) were more abundant in SOA formed in the similar to 70% Rh experiment. The elevated yields and O/C of SOA could be attributed to the promoted formation and particle-phase diffusivity of highly oxidized molecules. In addition, in comparison with TMB, TOL could produce more unsaturated aldehydes, which are oxidized into carboxylic acids with high O/C, leading to a more sensitive response of TOL SOA formation to the change in Rh. Our work provides mechanistic insights into Rh roles in aromatic SOA formation and is helpful for a better understanding of humid-haze events.

关键词： secondary organic aerosol aromatic hydrocarbons highly oxidized molecules relative humidity

Multi-component decompositions, linear superpositions, and new nonlinear integrable coupled KdV-type systems

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

Communications in Theoretical Physics 2025年第2期77卷 3-14页

作者： Xiazhi hao S y Lou School of Mathematical Science Zhejiang University of Technology School of Physical Science and Technology Ningbo University

In the realm of nonlinear integrable systems, the presence of decompositions facilitates the establishment of linear superposition solutions and the derivation of novel coupled systems exhibiting nonlinear integrability. By focusing on single-component decompositions within the potential BKP hierarchy, it has been observed that specific linear superpositions of decomposition solutions remain consistent with the underlying equations. Moreover, through the implementation of multi-component decompositions within the potential BKP hierarchy,successful endeavors have been undertaken to formulate linear superposition solutions and novel coupled Kd V-type systems that resist decoupling via alterations in dependent variables.

关键词： integrable system single-component decomposition multi-component decomposition linear superposition integrable coupled KdV-type system

[Analysis of coexisting and associated factors of intracerebral hemorrhage lesions in patients with recent subcortical small infarct]

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Zhonghua yi xue za zhi 2025年第7期105卷 529-536页

作者： Z R Wu C Zong K Zhang h B Liu y y Zhao y h Wang y Gao y M Xu Department of Neurology the First Affiliated Hospital of Zhengzhou University NHC Key Laboratory of Prevention and Treatment of Cerebrovascular Disease Zhengzhou 450052China. Department of General ICU the First Affiliated Hospital of Zhengzhou University Zhengzhou 450052China.

To explore the clinical characteristics and related risk factors of intracerebral hemorrhage (ICh) lesions identified on susceptibility-weighted imaging (SWI) sequences in patients with recent subcortical small infarct (RSSI). The patients with lenticulostriate artery territory RSSI admitted to the Department of Neurology, the First Affiliated hospital of Zhengzhou University from January 2019 to December 2022 was retrospectively collected. Demographic information, past medical history, laboratory, and imaging data were collected. Observe the ICh lesions in patients on the brain SWI sequence and divide RSSI patients into the coexisting-ICh group (=37) and the non-ICh group (=324) according to whether they have ICh. At the same time, the hemorrhage-related imaging features coexisting such as cerebral microbleeds (CMBs), cerebral surface siderosis (cSS), and probable cerebral amyloid angiopathy (CAA). Multifactorial logistic regression model was used to analyze the associated factors of ICh lesions in RSSI patients. A total of 361 patients with RSSI in the lenticulostriate artery territory area were included. The mean age was (60±12) years, with 243 male patients (67.3%). Among them, 37 patients (10.2%) had coexisting ICh lesions, mainly presenting as strict deep type [29 cases (78.4%)], with others including strict lobar type [2 cases (5.4%)], infratentorial type [2 cases (5.4%)], and mixed type[ 4 cases (10.8%)]. 30 cases (8.3%) had concomitant strict lobar CMBs, 5 cases (1.4%) had cSS, and 23 cases (6.4%) met the Boston 2.0 criteria for probable CAA. Multivariate logistic regression model analysis revealed that the high-grade enlargement of perivascular spaces in the basal ganglia (hEPVS) (=3.356,95%:1.208-9.320,=0.020) were associated with the presence of ICh lesions. When the total cerebral small vessel disease (CSVD) burden score was used to represent other CSVD imaging markers for analysis, the CSVD total burden score (=2.319,95%:1.596-3.372,<0.001) was also

关键词：脑出血近期皮质下小梗死脑微出血皮质表面铁沉积血管周围间隙横断面研究

Nickel-copper alloying arrays realizing efficient co-electrosynthesis of adipic acid and hydrogen

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 Energy Chemistry 2025年第02期101卷 7-15页

作者： Xuhui Ren Qianyu Zhang yun Tong Guorong Zhou Cong lin yanying Zhao Pengzuo Chen School of Chemistry and Chemical Engineering Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province Zhejiang Sci-Tech University

Constructing electrocatalytic overall reaction technology to couple the electrosynthesis of adipic acid with energy-saving hydrogen production is of significant for sustainable energy ***,the development of highly-active bifunctional electrocatalysts remains a ***,3D hierarchical nickel-copper alloying arrays with dendritic morphology are manufactured by a simple electrodeposition process,standing for the excellent bifunctional electrocatalyst towards the co-production of adipic acid and h2from cyclohexanone and *** membrane-free flow electrolyzer of Cu0.81Ni0.19/NF shows the superior electrooxidation performance of ketone-alcohol（KA） oil with high faradaic efficiencies of over 90% for adipic acid and h2,robust stability over 200 h as well as a high yield of 0.6 mmol h-1for adipic acid at 100 mA ***-situ spectroscopy indicates the Cu0.81Ni0.19alloy contributes to forming more active NiOOh species to involve in the conversion of cyclohexanone to adipic acid,while the proposed reaction pathway undergoes the 2-hydroxycyclohexanone and 2,7-oxepanedione ***,the theoretical calculations confirm that the optimal electronic interaction,boosted reaction kinetics as well as improved adsorption free energy of reaction intermediates,synergistically endows Cu0.81Ni0.19alloy with superior bifunctional performance.

关键词： Adipic acid Cu0.81Ni0.19 alloy Cyclohexanone oxidation reaction hydrogen evolution reaction hydrogen fuel