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Finite Temperature Magnetism in the triangular Lattice Antiferromagnet KErTe_(2)

Chinese Physics Letters 2024年第9期41卷 140-150页

作者： Weiwei Liu Zheng Zhang Dayu Yan Jianshu Li Zhitao Zhang Jianting Ji Feng Jin Youguo Shi Qingming Zhang Department of Physics Renmin University of ChinaBeijing 100872China Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China

After the discovery of the ARECh_(2)(A=alkali or monovalent ions,RE=rare-earth,Ch=chalcogen)triangular lattice quantum spin liquid(QSL)family,a series of its oxide,sulfide,and selenide counterparts has been consistently reported and extensively *** KErTe_(2) represents the initial synthesized telluride member,preserving its triangular spin lattice,it was anticipated that the substantial tellurium ions could impart more pronounced magnetic attributes and electronic structures to this material *** study delves into the magnetism of KErTe_(2) at finite temperatures through magnetization and electron spin resonance(ESR)*** on the angular momentum J after spin-orbit coupling(SOC)and symmetry analysis,we obtain the magnetic effective Hamiltonian to describe the magnetism of Er^(3+)in R3m space *** the mean-field approximation to the Hamiltonian,we can simulate the magnetization and magnetic heat capacity of KErTe_(2) in paramagnetic state and determine the crystalline electric field(CEF)parameters and partial exchange *** relatively narrow energy gaps between the CEF ground state and excited states exert a significant influence on the *** example,small CEF excitations can result in a significant broadening of the ESR linewidth at 2 *** the fitted exchange interactions,although the values are small,given a large angular momentum J=15/2 after SOC,they still have a noticeable effect at finite ***,the heat capacity data under different magnetic fields along the𝑐axis direction also roughly match our calculated results,further validating the reliability of our analytical *** derived parameters serve as crucial tools for future investigations into the ground state magnetism of KErTe_(2).The findings presented herein lay a foundation for exploration of the intricate magnetism within the triangular-lattice delafossite family.

关键词： triangular Hamiltonian magnetization

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Quantum effect of triple-perovskite antiferromagnets with triangular lattices, A_(3)MB_(2)O_(9) (A = Ba, Ca, and Sr;M = Co, Ni, and Mn;B = Sb, Nb)

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Chinese Physics Letters 2024年第12期41卷 181-201页

作者： Meng Zhang Mingfang Shu Xiaoling Shen Jie Ma Key Laboratory of Artificial Structures and Quantum Control School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Guangdong Provincial Key Laboratory of Extreme Conditions Dongguan 523803China

As a typical two-dimensional frustrated quantum magnet,the triangular-lattice antiferromagnet exhibits a series of exotic states from the complicated interplay of the lattice,spin,electron,and orbit with quantum and thermal *** the ground state of a triangular-lattice Heisenberg antiferromagnet with coplanar 120o ordering,a series of magnetization anomalies can manifest under a magnetic field,such as the 1/3 magnetization plateau(Ms/3)and umbrella-shaped *** Ms/3 plateau state is recognized as an up-up-down structure stabilized by the quantum *** surveying theoretical research and experimental measurements on triangularlattice antiferromagnets,this review article describes the current understanding of the magnetic properties of triple-perovskite antiferromagnets A_(3)MB_(2)O_(9)(A=Ba,Ca,and Sr;M=Co,Ni,and Mn;B=Sb,Nb).Through examining both the bulk properties and spin dynamics,fascinating insights into the quantum effect on the triangular lattice are discussed.

关键词： triangular perovskite quantum

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Numerical study of heat transfer in a 3D triangular prism with a rotating cylinder using ternary hybrid nanofluids and a new regression model

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NONLINEAR DYNAMICS 2025年第8期113卷 8161-8192页

作者： Usman, Zhipeng Xia, Zhipeng Wang, Jianhong Memon, Abid Ali Muhammad, Taseer Shandong Univ Sch Qilu Transportat Jinan Peoples R China Natl Univ Sci & Technol Dept Comp Sci Balochistan Campus NBC Quetta 87300 Pakistan Sukkur IBA Univ Dept Math Basic Sci & Humanities Sukkur Sindh 65200 Pakistan King Khalid Univ Coll Sci Dept Math Abha 61413 Saudi Arabia

The rise in global temperatures has made it increasingly difficult to maintain a controlled indoor climate without excessive electrical energy consumption. Economic boundaries further strain the energy supply in many regions worldwide. This study investigates an innovative cooling application using ternary hybrid nanofluids (THNFs) in a roof structure modeled as a three-dimensional (3D) prism with an isosceles triangular base. A circular cylinder, capable of counterclockwise rotation, is integrated into the channel to enhance fluid dynamics. The cooling medium consists of water-based THNFs incorporating copper, aluminum oxide (alumina), and multi-walled carbon nanotubes. Numerical simulations of heat transfer and fluid flow are conducted using the non-isothermal flow interface in COMSOL Multiphysics 6.0, solving the three-dimensional Navier-Stokes and heat equations under realistic boundary conditions. Four key parameters, Reynolds number (100-500), nanomaterial shape factor (3-8.9), volume fraction of nanomaterials (1-10%), and cylinder rotational speed (0.1-0.4 m/s), are varied to assess their effects on heat distribution. The study evaluates average outlet temperature, Nusselt number, and Darcy-Weisbach friction factor.

关键词： triangular Prism Heat transfer (HT) COMSOL Regression equation Global warming

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Thermo-aeroelastic analysis of triangular composite plate with embedded shape memory alloy at supersonic flow

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JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES 2024年第13期35卷 1071-1100页

作者： Zabihi, Zabihulah Dardel, Morteza Fathi, Alireza Babol Noshirvani Univ Technol Dept Mech Engn POB 484Shariati St Babol *** Mazandaran Iran Ferdowsi Univ Mashhad Dept Mech Engn Mashhad Razavi Khorasan Iran

This work investigates the effectiveness of a shape-memory alloy (SMA) in controlling the instabilities of triangular composite plates under supersonic flow. Lagoudas' quadratic polynomial hardening theory models the SMA effect. First-order piston theory was used for the aerodynamic modeling, and the reference-temperature method was used for modeling the thermal heating. The buckling and post-buckling behaviors were studied for different boundary conditions with four different layups. In addition, buckling and post-buckling of the composite plate, with and without shape memory alloy wire, has been studied. The effect of SMA wire on aeroelastic instabilities is accurately studied. The embedded SMA wire significantly increased the stability region (postpone divergence and flutter velocities) and buckling temperature. Also, the time responses of the triangular composite plate are determined at different Mach numbers, showing that by increasing the Mach number, the SMA wire can control or decrease the vibration amplitudes.

关键词： triangular composite thermo-aeroelastic shape memory alloy supersonic flow

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Green synthesis of spherical and triangular silver nanoparticles by oil palm's lignin derivative

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SURFACES AND INTERFACES 2025年 60卷

作者： Ang, Phaik Ching Ibrahim, Mohamad Nasir Mohamad Perumal, Veeradasan Adnan, Rohana Azman, Daruliza Kernain Mohd Raja, Pandian Bothi Univ Sains Malaysia Sch Chem Sci Gelugor 11800 Penang Malaysia Univ Teknol PETRONAS Ctr Innovat Nanostruct & Nanodevices COINN Seri Iskandar 32610 Perak Darul Rid Malaysia Univ Sains Malaysia Inst Res Mol Med INFORMM Gelugor 11800 Penang Malaysia Univ Sains Malaysia Sch Chem Sci Mat Technol Res Grp MaTRec Gelugor 11800 Penang Malaysia

The morphology and size of nanomaterials are essential factors to consider in the nanotechnology area for various applications. However, many nanoparticle synthesis methods to produce specific morphologies tailored to certain properties involve using chemical reagents, which can lead to secondary environmental pollution. In this study, sodium lignosulfonate (NaLS) derived from oil palm's empty fruit bunch fiber served as reducing and capping agents for spherical and triangular AgNPs production via a simple and eco-friendly approach. The specific mixture surface morphology of AgNPs is formed at 50 degrees C reaction temperature and 0.2 Ag+/NaLS concentration ratio after 15 h stirring time successfully. The resulting NaLS-AgNPs have an average size of 36.88 +/- 0.5 nm and a zeta potential of -26.7 mV. The resultant AgNPs are stable and can be kept for 3 months with a few sedimentations in colloid condition.

关键词： Oil palm Nanoparticles Green synthesis Lignosulfonate triangular

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Phonon Focusing Effect in an Atomic Level triangular Structure

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Chinese Physics Letters 2023年第9期40卷 61-65页

作者：姜剑辉鲁爽陈杰 Center for Phononics and Thermal Energy Science China–EU Joint Lab for NanophononicsMOE Key Laboratory of Advanced Micro-structured MaterialsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China

The rise of artificial microstructures has made it possible to modulate propagation of various kinds of waves,such as light,sound and *** them,the focusing effect is a modulation function of particular *** propose an atomic level triangular structure to realize the phonon focusing effect in single-layer *** the positive incident direction,our phonon wave packet simulation results confirm that multiple features related to the phonon focusing effect can be controlled by adjusting the height of the triangular *** interestingly,a completed different focusing pattern and an enhanced energy transmission coefficient are found in the reverse incident *** detailed mode conversion physics is discussed based on the Fourier transform analysis on the spatial distribution of the phonon wave *** study provides physical insights to achieving phonon focusing effect by designing atomic level microstructures.

关键词： structure phonon triangular

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On the Behavior of Honeycomb, Grid and triangular PLA Structures under Symmetric and Asymmetric Bending

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MICROMACHINES 2023年第1期14卷 120-120页

作者： Cojocaru, Vasile Frunzaverde, Doina Miclosina, Calin-Octavian Babes Bolyai Univ Dept Engn Sci Traian Vuia Sq 1-4 Resita 320085 Romania

Additive manufacturing technologies enable the production of components with lightweight cores, by means of infills with various patterns and densities. Together with reduced mass and material consumption, infill geometries must ensure that strength and stiffness conditions are fulfilled. For the proper correlation of the infill type with the loading case of the part, the mechanical behavior of the infill along all three principal axes of inertia has to be known. In this paper, the behavior in symmetric and asymmetric bending of three infill geometries, commonly used in 3D printing processes (honeycomb, grid and triangles) is analyzed. The variations of deflections as a function of force orientation are presented, showing that honeycomb and triangular structures exhibit similar behaviors along the Y and Z principal axes of inertia. Furthermore, the displacements obtained for the three types of structures are compared, in relation to the consumed volume of material. The larger displacements of the grid structure compared to the honeycomb and triangular structures are highlighted.

关键词： additive manufacturing fused filament fabrication (FFF) polylactic acid (PLA) honeycomb grid triangular symmetric bending asymmetric bending

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Navigated Simultaneous Lateral Minimally Invasive Tubular and Posterior Mini-Open Access for Removal and Revision of triangular Sacroiliac Joint Implants: A Technical Note

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WORLD NEUROSURGERY 2024年 185卷 285-289页

作者： Razak, Shahaan S. Haider, Ghani West, Timothy Al Sideiri, Ghusn Massengale, Justin Beth Israel Deaconess Med Ctr Div Neurosurg Boston MA 02215 USA Harvard Med Sch Boston MA USA Stanford Univ Sch Med Dept Neurosurg Stanford CA USA

- BACKGROUND: Sacroiliac joint (SIJ) fusion, to treat back pain caused by SIJ dysfunction, can employ open or minimally invasive surgery (MIS) techniques and either cylindrical (screw-shaped) or triangular (wedge-shaped) implants. Fusion nonunion sometimes explains recurrent SIJ pain following fusion and occasionally requires hardware revision. MIS revision minimizes patient pain, infection, and disability, but due to the triangular implant size and form factor, implant removal can present challenges for MIS access during the explantation and achieving good bony purchase for reinstrumentation. Here, we report a prone single-position lateral MIS/posterior mini-open procedure for triangular-implant SIJ fusion revision. METHODS: The patient is a 72-year-old female who - nderwent right SIJ fusion for lower back and leg pain sustained after a fall 2 years prior but experienced recurrent pain over the subsequent 2 years, with imaging findings of right SIJ peri-hardware lucencies and diagnostic injections confirming persistent right-sided sacroiliitis. - RESULTS: The patient underwent hardware removal using the lateral MIS incision with table-mounted tubular access and image-guided navigation to maintain exposure, plus simultaneous reinstrumentation using a navigated S2alar-iliac screw and iliac bolt construct with connecting rod through the posterior mini-open incision made for the navigation reference frame spinous process clamp. CONCLUSIONS: The use of navigation and MIS access can significantly decrease the complexity of lateral hardware removal, and mini-open navigated screw-androd constructs offer reinstrumentation options accessible to surgeons unfamiliar with specialized posterior SIJ systems.

关键词： Minimally invasive Sacroiliac fusion triangular Revision

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Discharge Coefficient of Symmetrical Stepped and triangular Labyrinth Side Weirs in a Subcritical Flow Regime

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JOURNAL OF IRRIGATION AND DRAINAGE ENGINEERING 2023年第4期149卷 04023004-04023004页

作者： Alfatlawi, Thair J. Hashem, Thaer Hasan, Zaid Hamid Univ Babylon Coll Civil Engn Babylon 51001 Iraq

The labyrinth side weir structure is an optimal solution to regulate and divert excess flows across rivers, and irrigation and drainage channels when the opening length of the side weir is limited. Changing the geometry of the side weir is considered one way to improve its efficiency. The present study investigates the hydraulic effects of stepped labyrinth side weirs to increase their discharge capacity. To estimate the outflow over symmetrical stepped labyrinth side weir, the discharge coefficient needs to be determined. Normal triangular labyrinth side weir in one cycle mode has been modified by increasing the crest path using different steps. A total of 417 experiments were conducted on normal and stepped side weirs for various weir opening lengths, weir heights, internal head angles, and hydraulic conditions. The results were analyzed and compared. It was found that efficiency improved, and the discharge coefficient increased as the number of the steps decreased. Furthermore, the water surface profile becomes more uniform with decreasing number of steps. A lower number of steps, smaller head angle, and high weir length produce a higher discharge coefficient by approximately 15%-35% compared to a normal triangular labyrinth side weir;in addition, the Knope length decreases by approximately 40%-70% for the same effective length. Additionally, a reliable equation to estimate the discharge coefficient of the stepped labyrinth side weir was presented. The results of this study can be used to design side weirs with high hydraulic performance when the weir-included angle selected is small or there is a lack of space.

关键词： Labyrinth side weir Symmetrical Stepped triangular Discharge coefficient

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triangular Vascularized Free Fibula Flap for Massive Carpal Reconstruction

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JOURNAL OF HAND SURGERY-AMERICAN VOLUME 2022年第2期47卷 196.e1-196.e6页

作者： Graham, David Sivakumar, Brahman del Pinal, Francisco Gold Coast Univ Hosp Dept Orthopaed Surg 1 Hosp Blvd Southport Qld 4215 Australia Australian Res Collaborat Hands ARCH Mudgeeraba Australia Griffith Univ Sch Med Southport Qld Australia

Massive carpal loss following trauma, tumor, or infection poses a difficult reconstructive challenge. There are limited reconstructive options for such cases, particularly when the metacarpal bases are also lost. We describe a method of carpal reconstruction using closing wedge osteotomies in a triangular vascularized free fibular flap, and a proposed algorithm for the management of metacarpal instability in this setting. Copyright (C) 2022 by the American Society for Surgery of the Hand. All rights reserved.

关键词： Carpal reconstruction free fibular triangular

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