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Flow analysis of radiated micropolar nanofluid on a stretching/shrinking wedge surface under chemical reaction and multiple convective conditions 化学反应和多重对流条件下辐射微极纳米流体在拉伸/收缩楔形表面的流动分析
4区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2023-10-25 DOI: 10.1142/s0217979224503727
Raju Bag, Prabir Kumar Kundu
This paper reports the flow features and distributions of concentration and temperature of a micropolar type nanofluid (water-based) past a stretchable and shrinkable wedge, influenced by variable magnetic force, nonlinear sort thermal radiation and chemical reaction. Along with the consideration of multiple convection, the model of Buongiorno is stated. The Brownian motion and thermophoresis have been kept in the analysis. Suitable similarity alteration is approached to renovate the foremost equations to dimensionless ordinary differential equations (ODEs). Associated conditions became nondimensional forms according to this conversion. Then the numerical solutions of the reduced governing equations with boundary conditions are obtained by adopting the RK-4 technique with shooting criteria. The language MAPLE 17 assisted in developing this solution. Significant upshots of prime parameters on the fluid transmission, mass and heat transport properties are represented with suitable tables and graphs. In tabular form, we have reckoned the physical quantities of heat, mass transfer rates and drag friction coefficients to fulfill the engineering interest. This study acquaints that the material parameter negatively influenced nanofluid’s angular velocity. The fluid’s temperature improves with thermal and mass Biot numbers, but this response goes opposite for the parameter of wedge angle. Chemical reaction and wedge angle parameters amplify mass transport. This study can be beneficial in the blowing of chilled air by AC panels, the abstraction of crude oils, the nuclear power hub, the working of warships, making flaps on the wings of aeroplanes for advanced lift, submarines, the extraction of polymers and several other sectors in advanced science and industrial developments.
本文报道了一种微极性型纳米流体(水基)在变磁力、非线性热辐射和化学反应的影响下,通过可拉伸和可收缩楔块的流动特征、浓度和温度分布。在考虑多重对流的情况下,建立了波昂焦尔诺模型。布朗运动和热泳运动被保留在分析中。采用适当的相似度变换方法,将最前面的方程更新为无量纲常微分方程。根据这种转换,相关条件变成了无量纲形式。然后采用带射击准则的RK-4技术,得到了带边界条件的简化控制方程的数值解。语言MAPLE 17帮助开发了这个解决方案。主要参数对流体传递、质量和热传递性质的重要影响用适当的表格和图表表示。在表格中,我们已经计算了物理量的热量,传质率和阻力摩擦系数,以满足工程兴趣。研究发现材料参数对纳米流体角速度有负向影响。流体温度随热Biot数和质量Biot数的增加而提高,而楔角参数的增加则相反。化学反应和楔角参数放大了质量输运。这项研究对交流面板吹冷空气、原油提取、核动力枢纽、军舰工作、先进升力飞机机翼襟翼制造、潜艇、聚合物提取以及其他先进科学和工业发展领域的几个领域都是有益的。
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引用次数: 0
Crystal field, electronegativity and magnetic behavior of Mn-, Fe-, Co- and Ni-doped LiMgN half-Heusler: KKR-CPA approximation Mn-, Fe-, Co-和ni掺杂LiMgN半heusler: KKR-CPA近似的晶体场,电负性和磁性行为
4区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2023-10-25 DOI: 10.1142/s0217979224503880
Younes Ziat, Zakaryaa Zarhri, Hamza Belkhanchi
This paper aims to investigate the behavior of LiMgN half-Heusler (HH) semiconductor doped by transition metals (TM [Formula: see text] Mn, Fe, Co and Ni). HHs belong to the [Formula: see text] space group (No. 216) and have a zinc blende structure that can be described by the chemical symbol XYZ. The research methodology utilized in this investigation involves theoretical analysis based on the principles of density functional theory (DFT). The studied LiMg[Formula: see text]TM[Formula: see text]N alloy displayed the half-metallicity behavior when TM [Formula: see text] Fe, Co and Ni. Hence, these systems could be a promising candidate in spintronic application thanks to their ferromagnetism. The principal contribution to magnetism in the full LiMg[Formula: see text]TM[Formula: see text]N alloys comes from the Mn, Fe, Co and Ni doping. The partial magnetic moments of these elements are significantly greater than the combined partial magnetic moments of Li, Mg and N. When comparing LiMg[Formula: see text]Mn[Formula: see text]N to LiMg[Formula: see text]Fe[Formula: see text]N, 5 Co[Formula: see text]N and LiMg[Formula: see text]Ni[Formula: see text]N, it is important to note that the exchange splitting energy [Formula: see text] associated to their spin up and spin down were discussed. The variation of Mn(3d) in relation to ([Formula: see text]) is larger than that of Fe, Co and Ni. Therefore, [Formula: see text]. Furthermore, there is a correlation between the magnetic moment and electronegativity trend of the TM dopant. Specially, the electronegativity trend ([Formula: see text] is well matched with the total spin moment trend, where [Formula: see text].
本文旨在研究过渡金属(TM[公式:见文]Mn, Fe, Co和Ni)掺杂LiMgN半heusler (HH)半导体的行为。HHs属于[公式:见文本]空间群(第216号),具有闪锌矿结构,可以用化学符号XYZ来描述。本研究采用基于密度泛函理论(DFT)原理的理论分析方法。所研究的LiMg[公式:见文]TM[公式:见文]N合金在TM[公式:见文]Fe, Co和Ni时表现出半金属性行为。因此,由于它们的铁磁性,这些系统可能是自旋电子应用的一个有希望的候选者。在全LiMg[公式:见文本]TM[公式:见文本]N合金中,对磁性的主要贡献来自Mn, Fe, Co和Ni的掺杂。这些元素的部分磁矩明显大于Li, Mg和N的组合部分磁矩。当比较LiMg[公式:见文]Mn[公式:见文]N与LiMg[公式:见文]Fe[公式:见文]N, 5 Co[公式:见文]N和LiMg[公式:见文]Ni[公式:见文]N时,重要的是要注意讨论与它们的自旋有关的交换分裂能[公式:见文]。Mn(3d)相对于([公式:见文])的变化大于Fe、Co和Ni。因此,[公式:见正文]。此外,TM掺杂剂的磁矩与电负性趋势之间存在相关性。特别地,电负性趋势([公式:见文])与总自旋矩趋势很好地匹配,其中[公式:见文]。
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引用次数: 0
Entropy generation analysis of non-miscible couple stress and Newtonian fluid in an inclined porous channel with variable flow properties: HAM Analysis 变流动特性倾斜多孔通道中非混相耦合应力和牛顿流体的熵生成分析:HAM分析
4区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2023-10-20 DOI: 10.1142/s0217979224503909
Ankit Kumar, Pramod Kumar Yadav
The aim of this study is to investigate the entropy production characteristics of two non-miscible fluids in an inclined porous channel with temperature-dependent thermal conductivity and viscosity. The porous region of the channel is divided in two regions. In region-1 and region-2, the Couple stress and Newtonian fluid take place due to constant pressure gradient, respectively, under the influence of a uniform magnetic field. Here, the Darcy–Brinkman model is used for the flow of immiscible fluid through the porous media. In this work, we used a semi-analytical method named as homotopy analysis method (HAM) to solve the coupled nonlinear ordinary differential equations. The goal of the considered problem is to examine the consequences of a variety of thermophysical parameters, including Hartmann number, varying viscosity parameter, varying thermal conductivity parameters, and Grashof number on the characteristics of entropy generation, Bejan number distribution, thermal behavior and flow characteristics of non-miscible couple stress and Newtonian fluid passing through a porous channel. The novel aspect of this study is the formation of entropy and Bejan number as a result of non-miscible Newtonian and couple stress fluids with varying thermal conductivity and viscosity in porous media. In terms of rheological investigation, a semi-analytical simulation for changeable thermal and flow properties in an immiscible Newtonian and couple stress fluid via an inclined porous channel is a brand-new concept, and the behaviors of such flows have not been examined yet. From this study, it is concluded that on raising the variable thermal conductivity, Hartmann number and the permeability of the porous medium, the flow velocity, thermal characteristics and entropy generation number decrease. The authors also come to the significant conclusion that non-miscible Newtonian and couple stress fluids have larger entropy production numbers, flow velocities, and temperature profiles for higher values of Grashof number, variable viscosity parameter, and couple stress parameter. The findings of this work have also been graphically validated through the previously established work. The results of the present analysis can be used in petroleum industry, lubrication theory, etc.
本研究的目的是研究两种非混相流体在具有温度依赖的热导率和粘度的倾斜多孔通道中的熵产特性。通道的多孔区域分为两个区域。在区域1和区域2中,在均匀磁场的作用下,由于恒定的压力梯度,分别产生了耦合应力和牛顿流体。这里,Darcy-Brinkman模型用于非混相流体在多孔介质中的流动。本文采用一种半解析方法——同伦分析法(HAM)来求解耦合非线性常微分方程。所考虑的问题的目标是检查各种热物理参数的影响,包括哈特曼数、变化粘度参数、变化导热系数参数和Grashof数对通过多孔通道的非混相耦合应力和牛顿流体的熵产特性、Bejan数分布、热行为和流动特性。本研究的新颖之处在于,在多孔介质中,具有不同热导率和粘度的非混相牛顿和耦合应力流体会导致熵和贝让数的形成。在流变学研究方面,对非混相牛顿和耦合应力流体在倾斜多孔通道中的热流动特性变化进行半解析模拟是一个全新的概念,这种流动行为尚未得到研究。研究结果表明,增大孔隙介质的变热导率、哈特曼数和渗透率,孔隙介质的流速、热特性和熵产数均减小。非混相牛顿流体和耦合应力流体在较高的Grashof数、变黏度参数和耦合应力参数下具有较大的熵产数、流速和温度分布。这项工作的发现也通过先前建立的工作得到了图形验证。分析结果可用于石油工业、润滑理论等方面。
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引用次数: 0
Spin–photon interface for a solid-state spin system via single trapped ion 单阱离子自旋系统的自旋光子界面
4区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2023-10-20 DOI: 10.1142/s0217979224503934
Fangzhou Jin, Weiping Liu, Hui Zhou
An efficient spin–photon interface plays a significant role in building quantum network and distributed quantum computing with solid-state spin system, e.g., nitrogen-vacancy (NV) center in diamond. Solid-state spin system has the advantages of excellent portability and long coherence time, however, it suffers from a critical drawback of low efficiency of spontaneously emitted photons in the zero phonon line. This poses a severe challenge for the generation of an efficient interface between solid-state spin and photon. Here, we propose a method to establish a coherent interface between photon and solid-state spin system which is coupled to a trapped ion via a quantum transducer. Our method provides a new route to establish an efficient spin–photon interface allowing the generation of entanglement between distant spins.
高效的自旋光子界面在利用金刚石中氮空位中心等固态自旋系统构建量子网络和分布式量子计算中发挥着重要作用。固体自旋系统具有便携性好、相干时间长等优点,但存在零声子线自发发射光子效率低的缺点。这对在固体自旋和光子之间产生有效的界面提出了严峻的挑战。在这里,我们提出了一种建立光子和固体自旋系统之间相干界面的方法,该系统通过量子换能器与捕获离子耦合。我们的方法提供了一种新的途径来建立一个有效的自旋光子界面,允许在远距离自旋之间产生纠缠。
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引用次数: 0
Grain boundary segregation behavior of Mo atoms in nanocrystalline Ni–Mo alloy 纳米晶Ni-Mo合金中Mo原子的晶界偏析行为
4区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2023-10-20 DOI: 10.1142/s021797922450382x
Zehui Jia, Wei Zhang, Junqiang Ren, Hongtao Xue, Fuling Tang, Junchen Li, Xuefeng Lu
In this paper, molecular dynamics method was used to design the grain boundary (GB) segregation structure of solute atom Mo in nanocrystalline nickel, and the effect of the segregation structure on the migration and deformation mechanism of nanocrystalline Ni–Mo alloy boundaries was studied. The results indicate that the addition of solute atom Mo can cause segregation at GBs, and the yield strength and tensile strength of nanocrystalline Ni are significantly increased through solid solution strengthening. Mo atoms segregation result in an increase of the GB thickness and stability of the GB. In addition, by labeling GB atoms and tracking their diffusion trajectories, it was found that after adding Mo atoms, the probability of atomic diffusion at GBs decreased. This indicates that Mo atoms reduce GB energy and improve GB stability. Meanwhile, as the Mo content increases, the degree of atomic disorder increases, and the probability of GB migration decreases. This leads to the inability of grains to merge and inhibit their growth, effectively improving the mechanical properties of the material. As the strain increases, the number and length of dislocations increase, and a large amount of entanglement occurs at GBs. With the increase of Mo content, the number of dislocations decreases sharply, with Shockley dislocations having the highest number. Shockley dislocations interact with other dislocations and hinder their generation and movement, forming a more stable dislocation system structure and increasing the strength of the alloy. Our work focuses on observing the influence of GB segregation structure on the mechanical properties and deformation mechanism of nanocrystalline polycrystalline Ni–Mo alloys, establishing the mechanism of the influence of segregation structure on the stability and coarsening of nanocrystalline metal GBs, examining the influence of segregation structure on dislocation motion and GB migration process during deformation, and proposing positive research and development ideas and theoretical basis for designing nanocrystalline metal materials with excellent performance.
本文采用分子动力学方法设计了纳米晶镍中溶质原子Mo的晶界(GB)偏析结构,并研究了偏析结构对纳米晶Ni-Mo合金晶界迁移和变形机制的影响。结果表明:溶质原子Mo的加入使纳米晶Ni在GBs处发生偏析,通过固溶体强化使其屈服强度和抗拉强度显著提高;Mo原子的偏析使GB厚度增加,稳定性提高。此外,通过标记GB原子并跟踪其扩散轨迹,发现加入Mo原子后,原子在GB处的扩散概率降低。这说明Mo原子降低了GB的能量,提高了GB的稳定性。同时,随着Mo含量的增加,原子无序度增大,GB迁移的概率减小。这导致晶粒无法合并并抑制其生长,有效地改善了材料的力学性能。随着应变的增加,位错的数量和长度增加,在GBs处出现大量的缠结。随着Mo含量的增加,位错数量急剧减少,其中Shockley位错数量最多。肖克利位错与其他位错相互作用,阻碍其产生和运动,形成更稳定的位错体系结构,提高合金的强度。我们的工作重点是观察GB偏析结构对纳米晶多晶Ni-Mo合金力学性能和变形机理的影响,建立偏析结构对纳米晶金属GB稳定性和粗化的影响机理,考察偏析结构对变形过程中位错运动和GB迁移过程的影响。为设计性能优异的纳米晶金属材料提出积极的研发思路和理论依据。
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引用次数: 0
An investigative study on optical and dielectric characteristics of Thiourea Cadmium Hydrogen Borate NLO crystal for photonic applications 用于光子应用的硫脲镉硼酸氢NLO晶体光学和介电特性的研究
4区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2023-10-20 DOI: 10.1142/s0217979224503946
M. Divya, A. Joseph Arul Pragasam, P. Malliga
Single crystals of Thiourea Cadmium hydrogen borate (TCHB), a hybrid nonlinear optical (NLO) material, are grown from an aqueous solution by slow evaporation solution growth technique at ambient temperature. Characterization studies have been conducted to probe the nonlinear effects of the crystal. The crystalline nature of TCHB is explored using the single crystal X-ray diffraction technique. The chemical composition is resolved by the Fourier transform infrared (FTIR) spectroscopy and energy dispersive X-ray analysis. UV–Vis spectral studies analyze the transparency of the crystal. Optical studies illustrate the UV cut-off wavelength to be 285[Formula: see text]nm with wide window of transparency in the infrared and visible regions. The optical and electrical conductivity studies indicate superior optical response essential for optical computing and photonic applications. The Kurtz powder test has confirmed the NLO capability. The thermal stability is analyzed through a thermogravimetric study. Dielectric and AC conductivity measurements carried out over a wide range of frequencies (100[Formula: see text]Hz to 5[Formula: see text]MHz) for various temperatures establish the semiconducting and photonic capacity of TCBH crystal to be used as photodiodes, optical fibres and laser lights.
采用慢蒸发溶液生长技术,在常温条件下从水溶液中生长出一种杂化非线性光学材料——硼酸硫脲镉(TCHB)单晶。对晶体的非线性效应进行了表征研究。利用单晶x射线衍射技术研究了TCHB的晶体性质。化学成分由傅里叶变换红外光谱(FTIR)和能量色散x射线分析分辨。紫外-可见光谱研究分析了晶体的透明度。光学研究表明,紫外截止波长为285 nm,在红外和可见光区域具有宽的透明窗口。光学和电导率的研究表明,优越的光响应是光学计算和光子应用所必需的。库尔茨火药试验证实了NLO能力。通过热重法分析了其热稳定性。介电和交流电导率的测量在广泛的频率范围内进行(100[公式:见文]赫兹至5[公式:见文]兆赫)在不同的温度建立TCBH晶体的半导体和光子容量,用于光电二极管,光纤和激光灯。
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引用次数: 0
A revised model on three-dimensional hydromagnetic convective flow of nanofluids over a nonlinearly inclined stretching sheet 一种修正的纳米流体在非线性倾斜拉伸片上的三维磁对流模型
4区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2023-10-20 DOI: 10.1142/s0217979224503831
P. Suriyakumar, S. Suresh Kumar, M. Muthtamilselvan
Theoretical research has been done on the hydromagnetic three-dimensional nanofluid flow across an inclined stretching sheet in the presence of Brownian motion and thermophoresis. It is taken into account that there are two different kinds of water-based nanofluids that contain copper and alumina. Three-dimensional nonlinear-type similarity transformations are used to convert the governing boundary-layer equations into a collection of similarity equations, which are then numerically solved by MATLAB. Further, results obtained in some limiting cases are compared to some results that have already been published, and it is found that there is good agreement. The problem is controlled by a number of physical factors, and the impact of these factors on different flow distributions is thoroughly examined with the help of graphs and tables. It has been observed that the nanofluid has better heat transfer conductivity than the ordinary base fluid.
本文从理论上研究了在布朗运动和热泳作用下纳米流体在倾斜拉伸片上的三维流动。考虑到有两种不同的水基纳米流体含有铜和氧化铝。采用三维非线性相似变换将控制边界层方程转化为相似方程集合,并利用MATLAB对其进行数值求解。进一步,将在一些极限情况下得到的结果与已经发表的一些结果进行了比较,发现两者有很好的一致性。这个问题是由许多物理因素控制的,这些因素对不同的流动分布的影响是借助图形和表格来彻底检查的。研究发现,纳米流体比普通基流体具有更好的导热性。
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引用次数: 0
Dirac particles with screened Kratzer–Hulthen plus ring-shaped potential in noncompact extra dimensions 非紧化额外维度中具有屏蔽Kratzer-Hulthen和环状势的Dirac粒子
4区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2023-10-19 DOI: 10.1142/s0217979224503855
A. Atangana Likéné, J. M. Ema’a Ema’a, P. Ele Abiama, G. H. Ben-Bolie
To describe the four fundamental interactions observed in the universe, we used the Dirac equation containing an interaction of the screened Kratzer and the Hulthen potential with a ring-shaped term. We study the energy spectra of spin-[Formula: see text] particles in noncompact extra dimensions. The polar and angular parts of the N-dimensional Dirac equation are solved using the Nikiforov–Uvarov method. The transcendental energy equation and the associated two components spinor wavefunctions of the spin-[Formula: see text] particles are obtained. Moreover, we obtained the nonrelativistic limit of our results by mean of a specific mapping. Some special cases of the proposed potential have been discussed, and their corresponding eigenvalue energies were determined. Finally, we proposed that our results can be used in many branches of physics, to investigate scenarios in extra dimensions where spin-[Formula: see text] particles are involved. To test the reliability of our model, we computed the numerical values of the energy spectra of lithium hydride and hydrogen chloride diatomic molecules using a special case of the proposed potential. The energy spectra are calculated for different quantum numbers [Formula: see text] at different values of the dimensionality of the space. The results of this research are overall in good agreement with the theoretical studies of similar investigation.
为了描述在宇宙中观察到的四种基本相互作用,我们使用了狄拉克方程,该方程包含筛选的克拉泽势和胡尔森势的相互作用,并带有环状项。我们研究了非紧致额外维度中的自旋粒子的能谱。用Nikiforov-Uvarov方法求解了n维Dirac方程的极部和角部。得到了自旋粒子的超越能量方程和相关的双分量自旋波函数。此外,通过一个特定的映射,我们得到了结果的非相对论性极限。讨论了所提势的一些特殊情况,并确定了它们对应的特征值能量。最后,我们提出,我们的结果可以用于物理学的许多分支,以研究额外维度中涉及自旋粒子的情况。为了测试我们模型的可靠性,我们使用所提出的电势的特殊情况计算了氢化锂和氯化氢双原子分子能谱的数值。在不同的空间维数值下计算不同量子数的能谱[公式:见文]。本研究的结果与同类调查的理论研究结果总体上是一致的。
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引用次数: 0
Investigation on prospective thermoelectrics — cubic Nd-doped LMO and rhombohedral Cu4Mn2Te4 materials — first principles approach 前景热电材料的研究-立方掺nd LMO和菱面体Cu4Mn2Te4材料-第一性原理方法
4区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2023-10-19 DOI: 10.1142/s0217979224503892
S. Priyadharshini, M. Sundareswari
Structural, electronic, magnetic and optical properties of Cu 4 Mn 2 Te 4 have been reported earlier by the authors, and here, the transport properties of the same are discussed along with the band structure investigation of the neodymium-doped cubic material LMO (LiMn 2 O 4 ), namely LiMn[Formula: see text]Nd[Formula: see text]O 4 compound, under spin polarized schemes through the First Principles calculations. The Full Potential-Linearized Augumented Plane Wave Method (FP-LAPW) method is adopted to investigate the electronic structures based on the framework of Density Functional Theory (DFT). Exchange potentials are treated using the Generalized Gradient Approximations (GGA). Cohesive energy calculations reveal that the ferromagnetic phase of LiMn[Formula: see text]Nd[Formula: see text]O 4 and the antiferromagnetic phase of Cu 4 Mn 2 Te 4 exhibits a stable phase. Of these, FM-LiMn[Formula: see text]Nd[Formula: see text]O 4 shows a semi-metallic-like behavior in spin-up channel and metallic behavior in spin-down channel whereas antiferromagnetic Cu 4 Mn 2 Te 4 exhibits a band gap in both spin-up and spin-down channels. Dirac points are identified at −0.0625[Formula: see text]eV in the band structure plot of FM-LiMn[Formula: see text]Nd[Formula: see text]O 4 at its high symmetry points [Formula: see text] and W which is an indication of high electron mobility at ambient condition. The presence of flat and dispersive bands around the Fermi energy level is an indication of high thermopower, and it is present in both the compounds FM-LiMn[Formula: see text]Nd[Formula: see text]O 4 and AFM-Cu 4 Mn 2 Te 4 . From the present computations, at 300[Formula: see text]K, a power factor range of ([Formula: see text] scaled by relaxation time in [Formula: see text]W/msK 2 ) [Formula: see text] and [Formula: see text] is obtained for ferromagnetic LiMn[Formula: see text]Nd[Formula: see text]O 4 compounds at up and down spins, respectively. A typical power factor ([Formula: see text]Wm[Formula: see text]s[Formula: see text]K[Formula: see text]) of [Formula: see text] and [Formula: see text] is obtained for antiferromagnetic Cu 4 Mn 2 Te 4 at 325[Formula: see text]K required for good thermoelectric performance.
本文讨论了Cu 4 Mn 2 Te 4的结构、电子、磁性和光学性质,并通过第一原理计算研究了自旋极化方案下掺钕立方材料LMO (limn2o4),即LiMn[公式:见文]Nd[公式:见文]2o4化合物的能带结构。采用基于密度泛函理论(DFT)框架的全势线性化增强平面波方法(FP-LAPW)对电子结构进行了研究。交换势用广义梯度近似(GGA)处理。内聚能计算表明,LiMn[公式:见文]Nd[公式:见文]o4的铁磁相和cu4 Mn 2 Te 4的反铁磁相表现为稳定相。其中,FM-LiMn[公式:见文]Nd[公式:见文]o4在自旋向上的通道中表现出半金属的行为,在自旋向下的通道中表现出金属的行为,而反铁磁性cu4mn2te 4在自旋向上和自旋向下的通道中都表现出带隙。在FM-LiMn[公式:见文]的能带结构图中,Dirac点在−0.0625[公式:见文]eV[公式:见文]Nd[公式:见文]O 4在其高对称点[公式:见文]和W,这是环境条件下高电子迁移率的指示。在费米能级附近存在平坦和色散带是高热能的标志,它存在于两种化合物中:FM-LiMn[公式:见文]Nd[公式:见文]O 4和AFM-Cu 4 Mn 2 Te 4。从目前的计算中,在300[公式:见文]K下,对于铁磁性的LiMn[公式:见文]Nd[公式:见文]o4化合物,分别得到了([公式:见文])[公式:见文]和[公式:见文]的功率因数范围([公式:见文]在[公式:见文]W/msK 2中按弛豫时间缩放)[公式:见文]和[公式:见文]。得到了反铁磁cu4 Mn 2 Te 4在325[公式:见文]K为良好热电性能所需的[公式:见文]和[公式:见文]的典型功率因数([公式:见文]Wm[公式:见文]s[公式:见文]K[公式:见文])。
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引用次数: 0
MHD nanofluid flow through Darcy medium with thermal radiation and heat source MHD纳米流体在有热辐射和热源的达西介质中流动
4区 物理与天体物理 Q2 PHYSICS, APPLIED Pub Date : 2023-10-19 DOI: 10.1142/s0217979224503867
Muhammad Shoaib Anwar, Taseer Muhammad, Mumtaz Khan, V. Puneeth
In this analysis, we have considered heat transmission in two-dimensional steady laminar nanofluid flow past a wedge. Magnetohydrodynamic (MHD), Brownian motion, viscous dissipation and thermophoresis effects are considered over the porous surface. Similarity transformations have been used to change the governing partial differential equations (PDEs) into nonlinear higher-order ordinary differential equations (ODEs). Governing ODEs with boundary conditions are then converted to the system of first-order initial value problem. After that the modeled system is solved numerically by RK4 technique. Impact of the magnetic number, Eckert number, Prandtl number, Lewis number, Brownian motion, thermophoresis and permeability parameters on the flow domain is analyzed graphically as well as in tabular form. It is noted that magnitude of Nusselt number for the flow regime increases with the increase of nondimensional parameter [Formula: see text] while opposite behavior is observed in case of R.
在这个分析中,我们考虑了二维稳定层流纳米流体流过楔形时的传热。考虑了多孔表面的磁流体力学、布朗运动、粘性耗散和热泳效应。利用相似变换将控制偏微分方程转化为非线性高阶常微分方程。然后将带边界条件的微分方程转化为一阶初值问题。然后利用RK4技术对模型系统进行数值求解。用图表和表格的形式分析了磁数、Eckert数、普朗特数、路易斯数、布朗运动、热泳动和磁导率等参数对流域的影响。值得注意的是,流型的努塞尔数的大小随着无量纲参数的增加而增加[公式:见文],而在R的情况下则相反。
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International Journal of Modern Physics B
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