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arXiv 2025年

作者： Sharma, Ankush Upadhyay, Alka Department of Physics and Material Science Thapar Institute of Engineering and Technology Patiala147004 India

The study of exotic multi-quark states has garnered significant attention recently, particularly in heavy-quark dynamics within quantum chromodynamics (QCD). We perform a comprehensive spectroscopic analysis of fully heavy pentaquark states with quark configurations ccccc¯ and bbbbb¯, considering spin-parity quantum numbers JP = 1/2−, 3/2−, and 5/2−. We construct the color-spin wavefunctions to explore the internal structure and mixing effects in these exotic states. Using an extended form of the Gursey-Radicati mass formula by incorporating spin-dependent interactions, we calculated their mass spectra. The modification incorporates effective mass contributions and hyperfine interactions to improve the predictive power for these hadronic states. We systematically analyze their quantum numbers, including spin parity, isospin, and the eigenvalues of the quadratic Casimir operator, which characterize their symmetry properties. The calculated mass spectra are compared with existing theoretical predictions to assess the stability and possible decay channels of these states. The calculated mass spectra exhibit a strong dependence on the interplay between spin interactions and color configurations, shedding light on the binding mechanism within these fully heavy multiquark systems. To gain further insights into their stability and decay properties, we investigated their potential production modes from b-hadron decays. Our analysis identifies dominant strong decay channels, providing critical theoretical benchmarks for distinguishing these states in future LHCb or EIC experiments. This study offers new insights into the role of heavy-quark dynamics in exotic hadron spectroscopy, serving as a stringent test for effective QCD-based models and lattice QCD predictions. © 2025, CC BY.

关键词： Spin dynamics

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Advancements in heterojunction,cocatalyst,defect and morphology engineering of semiconductor oxide photocatalysts

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Journal of Materiomics 2024年第2期10卷 315-338页

作者： Guojing Wang Shasha Lv Yuanhua Shen Wei Li Linhan Lin Zhengcao Li State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials(MOE)School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Key Laboratory of Beam Technology and Material Modification Ministry of EducationCollege of Nuclear Science and TechnologyBeijing Normal UniversityBeijing100875China School of Physical Science and Technology Lanzhou UniversityLanzhou730000China Department of Engineering Physics Tsinghua UniversityBeijing100084China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing100084China

Photocatalytic technology has emerged as a crucial avenue for harnessing solar energy,presenting itself as a viable solution to address the current energy crisis and environmental *** past 50 years have witnessed significant progress and breakthroughs in scientific research on photocatalytic *** paper provides a comprehensive review of the mechanism of photocatalytic technology and methods to improve the photocatalytic efficiency of semiconductor photocatalysts,such as TiO_(2) and *** this paper,common modification methods are divided into four categories:heterojunction con-struction,cocatalysts,defects,and morphological *** origin and development of photo-catalysts in each category are briefly summarized;moreover,the latest progress in each type of modification is discussed.S-scheme heterojunctions retain the high reduction and oxidation capacity of photogenerated electrons and holes by sacrificing half of the photogenerated carriers,showing excellent performance in photocatalysis and great application *** challenges associated with current modification schemes are *** is growing interest in quantitative and atomic-level modu-lation as attractive approaches to tackling these *** the electronic spin state and internal field is important for minimizing photogenerated carrier recombination in *** review will inspire researchers and promote the application of photocatalytic technology.

关键词： Photocatalytic activity Modification Heterostructure Thermal annealing Ion irradiation

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Nonaqueous Precipitation Preparation of Hap Ceramic Whiskers Paper

SSRN

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SSRN 2024年

作者： Feng, Guo Huang, Xiaolong Wang, Dahai Guo, Zhiqi Jiang, Feng Yang, Qing Wu, Qian Hu, Qing Zhang, Quan Liu, Jianmin Department of Material Science and Engineering Jingdezhen Ceramic University Jingdezhen333000 China

Foldable HAp ceramic whiskers paper was prepared via nonaqueous precipitation method. The obtained HAp ceramic whiskers paper sample was characterized via FE-SEM, EDS-mapping, XRD, TEM, Raman, XPS, Pb2+ ions removal performance, curling performance and flame retardant performance tests. The results shows that HAp whiskers paper grows along superimposed growth of (002) crystal plane of HAp phase. The HAp whiskers grow on their both ends of whiskers. The HAp whiskers paper is smooth and uniform with high curlability, low moisture absorption and high Pb2+ ions removal performance. These characteristics make this HAp ceramic whiskers papers have superior properties compared with the traditional ceramic paper and show great applications prospect in various fields. © 2024, The Authors. All rights reserved.

关键词： Hydroxyapatite

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Substrate engineering for Tuning the Absorption Response of Microwave Absorber

Substrate Engineering for Tuning the Absorption Response of ...

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2023 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2023

作者： Yadav, Jyoti Mishra, Abhishek Vishwakarma, Rahul Srivastava, Kumar Vaibhav Ramkumar, J. Indian Institute of Technology Material Science Programme Kanpur India Indian Institute of Technology Department of Electrical Engineering Kanpur India Indian Institute of Technology Department of Mechanical Engineering Kanpur India

ISBN: (纸本)9798350328264

In this manuscript, the idea of substrate engineering is proposed and studied. The study is performed over a resistive patch printed on top of various 3D printable substrates. Two 3D printable fibers are used for the purpose: one is polylactic acid (PLA) and the other is conductive acrylonitrile butadiene styrene (CABS). The substrate design and composition are optimized for lowering overall thickness improving bandwidth, and quality factor. At last, a unit cel design is proposed for X-band absorption. More than 90% absorption is achieved up to 45° for both TE and TN polarization. The unit cell has 4-fold symmetry and is mounted on top of a honeycomb substrate made up of a composition of PLA and CABS fiber having 50% mixing by volume. © 2023 IEEE.

关键词： Additive manufacturing honeycomb Microwave absorbers substrate engineering

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Oxidative exfoliation of spent cathode carbon:A two-in-one strategy for its decontamination and high-valued application

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Chinese Journal of Chemical engineering 2023年第7期59卷 262-269页

作者： Runze Chen Yuran Chen Xuemin Liang Yapeng Kong Yangyang Fan Quan Liu Zhenyu Yang Feiying Tang Johnny Muya Chabu Maru Dessie Walle Liqiang Wang Henan Province Industrial Technology Research Institute of Resources and Materials School of Material Science and EngineeringZhengzhou UniversityZhengzhou 450001China College of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China College of Chemical Engineering Xiangtan UniversityXiangtan 411105China Foshan Green Intelligent Manufacturing Research Institute of Xiangtan University Foshan 528010China Department of Chemistry Faculty of ScienceUniversity of LubumbashiLubumbashiBP 1825Democratic Republic of the Congo College of Science Bahir Dar UniversityBahir Dar 79Ethiopia

Spent cathode carbon(SCC)from aluminum electrolysis is a potential graphite ***,full use of the SCC remains a challenge,since it contains many hazardous substances(e.g.,fluoride salts,cyanides),encapsulated within the thick carbon layers and thus posing serious environmental *** work presents a chemical oxidative exfoliation route to achieve the recycling of SCC and the decontaminated SCC with high-valued graphene oxide(GO)-like carbon structures(SCC-GO)is applied as an excellent adsorbent for organic ***,after the oxidative exfoliation,the embedded hazardous constituents are fully exposed,facilitating their subsequent removal by aqueous ***,benefiting from the enhanced specific surface areas along with abundant O-containing functional groups,the as-produced SCC-GO,shows an adsorption capacity as high as 347 mg·g^(-1)when considering methylene blue as a pollutant model,which exceeds most of the recently reported carbon-based *** study provides a feasible solution for the efficient recycling of hazardous carbonaceous wastes.

关键词： Waste treatment Spent cathode carbon Oxidative exfoliation Purification Recovery Adsorption

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INVESTIGATION OF THE PHENOL-DEGRADING ABILITY AND METABOLIC PATHWAYS OF BACTERIA ISOLATED FROM LANDFILL LEACHATE

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UPB Scientific Bulletin, Series B: Chemistry and materials science 2023年第2期85卷 105-118页

作者： Fikó, Dezső Róbert Csató-Kovács, Erika Szilveszter, Szabolcs Máthé, István Felföldi, Tamás Lányi, Szabolcs Faculty of Applied Chemistry and Material Science University POLITEHNICA of Bucharest Romania Faculty of Economics Socio-Human Sciences and Engineering Sapientia Hungarian University of Transylvania Romania Department of Microbiology Eötvös Loránd University Budapest Hungary

Phenol is an aromatic compound which can be found in many industrial wastewaters such as those of petrochemical, pharmaceutical industries and plastic manufacturing. Due to the toxic properties of phenols, outflow of the phenol-containing wastewaters to the environment must be prevented. Therefore, a number of methods can be used of which microbial degradation processes are environmentally friendly and cost-effective solutions. In this study, the biodegradation capacity of bacterial strains was analyzed at 100 mg/L initial phenol concentration. Among the strains studied Acinetobacter sp. CFII-97, Acinetobacter sp. CFII-99A, Arthrobacter crystallopoietes CFII-104 and Arthrobacter crystallopoietes CFII-112 were able to degrade the phenol in 8, 12, 28 and 32 hours respectively. The other strains showed no growth and no phenol degradation during the experiment. Acinetobacter sp. CFII-97 and Acinetobacter sp. CFII-99A degraded phenol by the meta-cleavage pathway, whereas the Arthrobacter crystallopoietes CFII-104 and Arthrobacter crystallopoietes CFII-112 strains by the ortho-cleavage pathway. © 2023, Politechnica University of Bucharest. All rights reserved.

关键词： Phenols

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Silicon Nitride Nanobeam Cavity Enhanced Second-Harmonic Generation of Monolayer WSe2

Silicon Nitride Nanobeam Cavity Enhanced Second-Harmonic Gen...

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CLEO: Fundamental science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Rarick, Hannah Kala, Abhinav Pumulo, Sinabu Manna, Arnab Sharp, David Munley, Christopher Majumdar, Arka Department of Physics University of Washington SeattleWA98105 United States Department of Electrical and Computer Engineering University of Washington SeattleWA98195 United States Department of Material Science Engineering University of Washington SeattleWA98195 United States

Integration of transition metal dichalcogenides onto photonic platforms enables on-chip nonlinear optical effects, like second-harmonic generation (SHG). In this paper, we demonstrate cavity enhanced SHG by integratin... 详细信息

ISBN: (纸本)9781957171395

关键词： Silicon nitride

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Correlating processing induced orientation with tensile properties for mass polymerized acrylonitrile butadiene styrene test specimens

RSC Applied Polymers

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RSC Applied Polymers 2024年第6期2卷 1032-1042页

作者： Fernandez, E. Edeleva, M. Cardon, L. Centre for Polymer and Material Technologies Department of Materials Textile and Chemical Engineering Ghent University Gent 9000 Belgium Laboratory for Chemical Technology Department of Materials Textile and Chemical Engineering Ghent University Gent 9000 Belgium Centre for Textile Science and Engineering Department of Materials Textile and Chemical Engineering Ghent University Gent 9000 Belgium

In this research, we deal with the link between tensile properties and processing-related morphology variations for mass polymerized acrylonitrile butadiene styrene (mABS). The orientation of multi-core polybutadiene (PB) particles, which are intrinsic to mABS, is investigated regarding flow, shear and cooling changes during sample production. The effect of a different sample size and annealing on the tensile responses has been verified by considering ISO 527 1A and 1BA dog bone samples. For the thin 1BA bars, multiple injection velocities and cooling rates during injection molding have been tested to obtain a more pure correlation between morphology and tensile properties. To perform comparable tensile measurements using both types of dog bone samples, a testing method has been designed for which a relation is included between the sample gauge length and cross head velocity, enabling the comparison of elastic deformation for ISO 527 1A and 1BA mABS samples. Regarding the mABS part morphology, injection molded parts display a skin-shear-core gradient morphology with respect to the PB-particle size and orientation. Annealing of both types of injection molded samples successfully removes most flow-induced orientation of the rubber particles but also results in a change in PB morphology by dissolving a small fraction of the rubber into the SAN matrix, forming PB-nanoparticles. These small particles promote shear bands upon craze-based deformation and therefore positively contribute to the sample toughness. High flow-induced orientation within mABS parts causes a significantly increased tensile stiffness, strength and toughness along the flow direction. Irrespective of the PB orientation, tensile bars with a large surface roughness experience early failure, due to premature craze and crack initiation at the sample surface. © 2024 RSC.

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Effect of texture on deformation behavior of heterogeneous Mg-13Gd alloy with strength-ductility synergy

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Journal of materials science & Technology 2022年第18期113卷 271-286页

作者： Shuaishuai Liu Han Liu Xiang Chen Guangsheng Huang Qin Zou Aitao Tang Bin Jiang Yuntian Zhu Fusheng Pan State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing400044China Department of Materials Science and Engineering City University of Hong KongHong Kong999077China Nano and Heterogeneous Material Center Nanjing University of Science and TechnologyNanjing210094China

Heterostructure metals as a new class of materials can effectively break the traditional strength–ductility trade-off dilemma. In this study, the extruded sheet with the small extrusion ratio(ER) of 3.9(ER3.9)presented a heterogeneous lamella structure(HLS) and texture, where the fine dynamical recrystallized(DRXed) grains formed a random texture and coarse un-DRXed grains exhibited a strong basal *** ER3.9 sample presented an excellent combination of strength and ductility. The texture strengthening in coarse grains and hetero-deformation induced(HDI) strengthening contributed to the enhanced strength of the ER3.9 sample besides grain refinement. The improving ductility mainly stems from the weakened texture in fine grains. Interestingly, in coarse grains, the strong basal texture, the occurrence of cross slip, low stacking fault energy(SFE), and dislocation pinned by precipitates weaken the HDI hardening effect. While the traditional dislocation hardening mainly generated by fine grains dominates overall strain hardening. Meanwhile, the activation of non-basal slips, especially pyramidal slip,and the generation of cross slips in fine grains benefit for coordinating plastic deformation. The ability for coordinate plastic deformation in fine grains is higher than that of coarse grains, which was confirmed by the digital image correlation technology. This work will promote the development of the heterogeneous theory in textured Mg alloys.

关键词： Mg-Gd alloy Recrystallization Heterogeneous texture Mechanical properties HDI hardening

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Electrochemical and Tribological Performance of Ti–Al with xNb Addition Synthesized via Laser In situ Alloying

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Journal of Bio- and Tribo-Corrosion 2024年第1期10卷 1-9页

作者： Kanyane, L.R. Raji, S.A. Tlotleng, M. Department of Chemical Metallurgical and Materials Engineering Tshwane University of Technology P.M.B. X680 Pretoria South Africa Pretoria0001 South Africa Material Science Innovation and Modelling Research Group North-West University Mahikeng Campus Mmabatho South Africa

Additive manufacturing is a growing technique of producing 3D parts directly using metal powders or wires melted with a high-powered intensity beam or laser. It is still a challenging process as to how laser processing parameters such as gas flow rate and powder flow rate can profitably be adopted to significantly produce Ti–Al-based materials from elemental powders to synthesize alloys that are defect-free and have good mechanical properties. The density of titanium aluminide (Ti–Al) intermetallic alloys makes it gain lots of interests due to its potential ability to substitute nickel-based superalloys in gas turbine engines. This work aims to investigate the effects of Niobium (Nb) additions on Ti–Al–xNb ternary alloys created via the use of 3D printing technology, specifically looking at microstructural evolution, microhardness, electrochemical behavior, and tribological properties. Ti–Al–Nb alloy was synthesized at scan speed of 26 in/min and laser power of 450 W. The structural morphology of the alloys produced was investigated using scanning electron microscopy equipped with energy dispersive spectroscopy and the electrochemical studies of the in situ alloyed Ti–Al–xNb were studied using potentiodynamic techniques. Using an Emco microhardness tester, the microhardness characteristics of the produced TiAl–xNb alloys were examined. From the results obtained, it was observed that the microstructure showed not much substantial cracking or crack initiation. The micrographs are evident of refined microstructure associated to increase in Nb feed rate with α-Ti3Al, γ-TiAl and precipitates of β-TiAl phases as the distinctively identified in the microstructure. The highest recorded microhardness value of 679.1 HV0.5 was achieved at Nb feed of 0.5 rpm and gas carrier of 2 L/min. The fabricated Ti–Al–Nb alloys showed good corrosion resistance behavior in HCl and appreciable wear characteristics with coefficient of friction of 0.412, 0.401, and 0.414 µ at B1, B3, and B5, r

关键词： Alloying

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