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ψ(2S) and J/ψ production in pp collisions at √s = 7, 8 and 13 TeV 在√s=7、8和13TeV条件下pp碰撞中的ψ(2S)和J/ψ产生
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-04-29 DOI: 10.3906/FIZ-2012-8
Y. Ali, U. Tabassam, Syed Uzair Ahmed Shah, A. Arif, M. Suleymanov, Z. Abidin
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引用次数: 1
The effect of Sn doping on the electronic and mechanical properties of Ti3 Al1−x Snx C2 MAX phases Sn掺杂对ti3al1−x Snx C2 MAX相电子力学性能的影响
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-04-29 DOI: 10.3906/FIZ-2101-6
A. Gencer, A. Erkişi
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引用次数: 0
Hollow-core optical fiber with eight-pointed star cladding structure for low-loss transmission in telecom bands 用于电信频段低损耗传输的八角星包层空心芯光纤
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-04-29 DOI: 10.3906/FIZ-2101-7
M. Ordu
In this study, a novel negative curvature hollow-core fiber is proposed for low-loss transmission in the near-infrared region. We numerically investigate the effect of the cladding structure, which is formed of concentrically interlaced squares, to the confinement losses using the finite element modelling. The design has eight cladding tubes with nested elements placed to the outer edge of the tubes. The confinement losses of the interlaced square core fiber is calculated as low as 0.12 dB/km in the range of 1.3 to 1.65 μm. The loss profile of the noncircular core design is comparable with the circular cores, and have improved transmission performance at 1.55 μm. The proposed design can have numerous application areas such as data transmission, nonlinear optics and biochemical sensing.
本文提出了一种新型的负曲率空心光纤,用于近红外区域的低损耗传输。本文采用有限元模型,数值研究了由同心圆交错方形构成的包层结构对约束损失的影响。该设计有八个包层管,嵌套的元素放置在管的外缘。在1.3 ~ 1.65 μm范围内,交错方形芯光纤的约束损耗低至0.12 dB/km。非圆芯设计的损耗分布与圆芯设计相当,并且在1.55 μm处传输性能有所提高。所提出的设计可以有许多应用领域,如数据传输,非线性光学和生化传感。
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引用次数: 2
Hydrogen sensing properties of Pd loaded TiO2 nanorods 负载钯的TiO2纳米棒的氢传感性能
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-04-29 DOI: 10.3906/FIZ-2012-13
S. Büyükköse
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引用次数: 0
Modeling and parametric study of dielectric barrier discharge in pure nitrogen at atmospheric pressure 常压纯氮介质阻挡放电的建模与参数研究
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-02-27 DOI: 10.3906/FIZ-2003-5
Mohammed Habib Allah Lahouel, D Benyoucef, H. Tebani
This paper presents the one-dimensional simulation of the dielectric barrier discharge (DBD) in pure nitrogen at atmospheric pressure using a sinusoidal supply, within a reactor which consists of two parallel plates. For this purpose, significant reactions among the reactive species in the discharge are taken into account in this work by considering more than 70 reactions for 13 species. The model used in this study to describe the kinetics of the plasma species is the second order fluid model which consists in replacing the Boltzmann equation by these first three moments by using the drift-diffusion approximation for flux. In order to validate the model developed in this research, a comparison of the simulated discharge currents obtained with available experimental data is carried out, before presenting the evolution of the properties of the plasma species. After that, a parametric study is performed showing the effect of some parameters like applied voltage, frequency and nature of the coating dielectric material on the characteristics of DBD in nitrogen. Simulation results for a double dielectric DBD reactor are also presented at the end of this paper.
本文在由两个平行板组成的反应器中,利用正弦电源对常压下纯氮介质阻挡放电(DBD)进行一维模拟。为此,本工作通过考虑13种反应种的70多种反应,考虑了排放中反应种之间的重要反应。本研究中用于描述等离子体种动力学的模型是二阶流体模型,该模型包括用通量的漂移-扩散近似用前三个矩代替玻尔兹曼方程。为了验证本研究中建立的模型,在介绍等离子体种类性质的演变之前,将模拟的放电电流与现有的实验数据进行了比较。然后进行了参数化研究,显示了施加电压、频率和涂层介质材料性质等参数对氮中DBD特性的影响。最后给出了双介质DBD电抗器的仿真结果。
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引用次数: 0
Chemical synthesis of nonstoichiometric NiOx nanoparticles using different nickel salts and application as an additive or interface layer in photovoltaic devices 使用不同镍盐的非化学计量NiOx纳米颗粒的化学合成及其在光伏器件中作为添加剂或界面层的应用
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-02-27 DOI: 10.3906/FIZ-2011-6
Fatma Pinar Gokdemir Choi
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引用次数: 1
Interactions between densely grafted molten polymer brushes: Scaling theories versus molecular simulations 密集接枝熔融聚合物刷之间的相互作用:缩放理论与分子模拟
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-02-27 DOI: 10.3906/FIZ-2010-5
A. Erbaş
Using molecular dynamics simulations and scaling arguments, we analyzed the interactions between two identical molten polymer brushes intermediately and strongly compressed towards each other at melt conditions. The width of the overlap region, in which monomers of the linear chains composing the two brushes interact, increases as the polymer-grafted surfaces are brought closer. If two-brush coated surfaces are as close as the characteristics size of the grafted chains, the overlap region is directly controlled by intersurface distance. At intermediate compression, the width of the overlap region scales with the end-to-end size of chain sections within the overlap region. This result is consistent with the scaling regimes in the literature. As the intersurface distance is decreased, the number fraction of chains (chains with their free ends in the overlap region) decreases with a power law. Our results could be useful for studies on tribological behavior of polymer-grafted surfaces as well as for the self-assembly of polymer coated colloids.
利用分子动力学模拟和尺度参数,我们分析了两个相同的熔融聚合物刷在熔融条件下相互之间的相互作用。组成两个电刷的线性链单体相互作用的重叠区域的宽度随着聚合物接枝表面的靠近而增加。如果两刷涂覆表面与接枝链的特征尺寸相近,则重叠区域直接受表面间距控制。在中等压缩时,重叠区域的宽度与重叠区域内链段的端到端大小成正比。这一结果与文献中的标度机制一致。随着界面距离的减小,链(自由端位于重叠区域的链)的数量分数呈幂律递减。我们的研究结果可用于聚合物接枝表面的摩擦学行为研究以及聚合物包覆胶体的自组装。
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引用次数: 1
Finite-time two-spin quantum Otto engines: Shortcuts to adiabaticity vs. irreversibility 有限时间双自旋量子奥托发动机:绝热与不可逆的捷径
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-02-23 DOI: 10.3906/fiz-2101-10
B. Çakmak
: We propose a quantum Otto cycle in a two spin- 1/2 anisotropic XY model in a transverse external magnetic field. We first characterize the parameter regime that the working medium operates as an engine in the adiabatic regime. Then, we consider finite-time behavior of the engine with and without utilizing a shortcut to adiabaticity (STA) technique. STA schemes guarantee that the dynamics of a system follows the adiabatic path, at the expense of introducing an external control. We compare the performance of the nonadiabatic and STA engines for a fixed adiabatic efficiency but different parameters of the working medium. We observe that, for certain parameter regimes, the irreversibility, as measured by the efficiency lags, due to finite-time driving is so low that nonadiabatic engine performs quite close to the adiabatic engine, leaving the STA engine only marginally better than the nonadiabatic one. This suggests that by designing the working medium Hamiltonian one may spare the difficulty of dealing with an external control protocol.
:我们在横向外磁场中提出了两自旋1/2各向异性XY模型中的量子Otto循环。我们首先描述了工作介质作为发动机在绝热状态下运行的参数状态。然后,我们考虑了在使用和不使用绝热捷径(STA)技术的情况下发动机的有限时间行为。STA方案以引入外部控制为代价,保证系统的动力学遵循绝热路径。我们比较了非绝热发动机和STA发动机在固定绝热效率但工作介质参数不同的情况下的性能。我们观察到,对于某些参数状态,由于有限时间驱动,通过效率滞后测量的不可逆性非常低,以至于非绝热发动机的性能非常接近绝热发动机,使STA发动机仅略好于非绝热发动机。这表明,通过设计工作介质哈密顿量,可以省去处理外部控制协议的困难。
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引用次数: 5
Quasinormal modes of charged fermions in linear dilaton black hole spacetime: exact frequencies 线性膨胀黑洞时空中带电费米子的准热模:精确频率
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-02-06 DOI: 10.3906/fiz-2012-6
I. Sakalli, Gülnihal TOKGÖZ HYUSEIN
We study charged massless fermionic perturbations in the background of $4$-dimensional linear dilaton black holes in Einstein-Maxwell-dilaton theory with double Liouville-type potentials. We present the analytical fermionic quasinormal modes, whose Dirac equations are solved in terms of hypergeometric functions. We also discuss the stability of these black holes under the charged fermionic perturbations.
在双Liouville型势的Einstein-Maxwell膨胀子理论中,我们研究了4维线性膨胀子黑洞背景下的带电无质量费米子扰动。我们提出了解析费米子准正规模,其Dirac方程是用超几何函数求解的。我们还讨论了这些黑洞在带电费米子扰动下的稳定性。
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引用次数: 4
Mixing angles between the tetraquark states with two heavy quarks within QCD sum rules 在QCD和规则下具有两个重夸克的四夸克态之间的混合角
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-01-01 DOI: 10.3906/fiz-2111-14
Selçuk Bi̇lmi̇ş
LHCb Collaboration has recently announced the observation of a doubly charmed tetraquark $T_{cc bar{u} bar{d}}^+$ state with spin parity $J^P = 1^+$. This exotic state can be explained as a molecular state with small binding energy. According to conventional quark model, both $D^+ D^{0ast}$ and $(D^0 D^{+ast})$ multiquark states are expected to have the same mass and flavor in the exact $SU(3)$ symmetry. However, since the quark masses are different, $SU(3) (SU(2))$ symmetry is violated, hence, the mass and flavor eigenstates do not coincide. The mass eigenstates can be represented as a linear combination of the flavor eigenstates, which is characterized by the mixing angle $theta$. In the present work, the possible mixing angles between the $T_{cc}$ states are calculated. Moreover, the analysis are extended for all the possible tetraquarks scenarios with two heavy and two light quarks within the molecular picture although those states have not been observed yet. Our prediction on mixing angle between doubly charmed tetraquark states shows that $SU(3)$ symmetry breaking is around $7%$ maximally.
LHCb合作最近宣布观测到双粲四夸克$T_{cc bar{u} bar{d}}^+$态,自旋宇称$J^P = 1^+$。这种奇异态可以解释为具有小结合能的分子态。根据传统的夸克模型,$D^+ D^{0ast}$和$(D^0 D^{+ast})$两种多夸克态在$SU(3)$对称下都具有相同的质量和风味。然而,由于夸克质量不同,$SU(3) (SU(2))$对称性被破坏,因此,质量和风味本征态不重合。质量本征态可以表示为风味本征态的线性组合,其特征为混合角$theta$。在本工作中,计算了$T_{cc}$状态之间可能的混合角。此外,该分析扩展到分子图像中所有可能的四夸克状态,其中两个重夸克和两个轻夸克,尽管这些状态尚未被观察到。我们对双粲四夸克态混合角的预测表明,$SU(3)$对称破缺最大发生在$7%$附近。
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引用次数: 2
期刊
Turkish Journal of Physics
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