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One-loop Form Factors for (Hrightarrow gamma^*gamma^*) in (R_{xi}) Gauge 单回路形式因素(Hrightarrow gamma^*gamma^*)在(R_{xi})压力表
Pub Date : 2021-09-30 DOI: 10.15625/0868-3166/16022
K. H. Phan, D. Tran
In this paper, we present general one-loop form factors for (Hrightarrow gamma^* gamma^*) in (R_{xi}) gauge, considering all cases of two on-shell, one on-shell and two off-shell for final photons. The calculations are performed in standard model and in arbitrary beyond the standard models which charged scalar particles may be exchanged in one-loop diagrams. Analytic results for the form factors are shown in general forms which are expressed in terms of the Passarino-Veltman functions. We also confirm the results in previous computations which are available for the case of two on-shell photons. The (xi)-independent of the result is also discussed. We find that numerical results are good stability with varying (xi=0,1) and $xirightarrow infty).
本文给出了在(R_{xi})规范中(H右row gamma^* gamma^*)的一般单环形式因子,考虑了最终光子的两个上壳层、一个上壳层和两个离壳层的所有情况。计算在标准模型和任意超出标准模型下进行,其中带电标量粒子可以在单环图中交换。形状因子的解析结果以Passarino-Veltman函数的一般形式表示。我们还证实了先前的计算结果,这些结果适用于两个上壳光子的情况。还讨论了与结果的(xi)无关性。我们发现数值结果在(xi=0,1)和$xi右行 inty )变化时具有很好的稳定性。
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引用次数: 0
Light Scattering by Noble Metallic Nanoparticles for Performance of Compound Soalr Cells Enhancement 贵金属纳米粒子光散射增强复合太阳能电池性能
Pub Date : 2021-09-30 DOI: 10.15625/0868-3166/15991
L. Nguyen
Light scattering by noble metallic nanoparticles are of interest for a variety of applications due to the large electromagnetic field enhancement that occurs in the vicinity of the metal surface, and the dependence of the resonance photon energy on the nanoparticle size, shape, local dielectric environment, and material. Here, the influences of electromagnetic scattering by Au and Ag nanoparticles placed atop compound solar cells on optical absorption and photocurrent generation were investigated based on the variation in the noble nanoparticle densities. The results indicated that the short-circuit current and power conversion efficiency were strongly affected by the density and material of the noble nanoparticles. The great improvement of 28% in power conversion efficiency can be obtained with Au nanoparticle density of 2(times)108 cm-2. This improvement can be attributed to light scattering, light trapping, and surface roughness by noble nanoparticles. Furthermore, Au nanoparticles showed more efficient in solar cell power conversion efficiency improvement than Ag nanoparticles did although density of Au nanoparticle was lower than that of Ag nanoparticles.
贵金属纳米粒子的光散射在各种应用中都很有意义,因为在金属表面附近会发生大的电磁场增强,并且共振光子能量与纳米粒子的大小、形状、局部介电环境和材料有关。本文基于贵金属纳米粒子密度的变化,研究了放置在复合太阳能电池上的Au和Ag纳米粒子的电磁散射对光吸收和光电流产生的影响。结果表明,贵金属纳米粒子的密度和材料对短路电流和功率转换效率有较大影响。的巨大进步% in power conversion efficiency can be obtained with Au nanoparticle density of 2(times)108 cm-2. This improvement can be attributed to light scattering, light trapping, and surface roughness by noble nanoparticles. Furthermore, Au nanoparticles showed more efficient in solar cell power conversion efficiency improvement than Ag nanoparticles did although density of Au nanoparticle was lower than that of Ag nanoparticles.
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引用次数: 0
Characteristics of Dye-doped Silica Nanoparticles- Based Random Lasers in the Air and Water 空气和水中染料掺杂二氧化硅纳米颗粒基随机激光器的特性
Pub Date : 2021-09-30 DOI: 10.15625/0868-3166/16091
D. Ta, Tam Trong Nguyen, H. H. Mai, T. X. Nguyen, L. H. Nghiem
Random lasers based on dye-doped silica nanoparticles are attracted for biomedical applications due to their biocompatibility and high brightness. Several laser structures including silica powder and film have been reported. However, the dependence of lasing characteristics including lasing threshold and emission wavelength on the laser size and working environment have not been explored. Here, we demonstrate and compare the lasing characteristics of dye-doped silica random lasers in air and water. These lasers present in thin structures, the so-called microslices, with a thickness of 1 µm and various dimensions from 30 to 300 µm. It is found that the lasing threshold (Ith) decreases with increasing laser size such as  for sample in the air and  for sample in water, where A the sample surface area. For a similar size, the lasing threshold of the sample in water is about 3-8 times higher than that of the sample in the air. In addition, the lasing peak wavelength exhibits a red-shift with increasing laser size. In the air, a shift of 8 nm is recorded when the sample surface area increases from 21×103 to 169×103 µm2. Furthermore, for a similar size, the lasing wavelength of the sample in the air is also red-shifted (13 nm in average ) compared with that of the sample in water. Our finding provides useful information for the use of silica-based random lasers in bioimaging and biosensing applications.
基于染料掺杂二氧化硅纳米粒子的随机激光器因其生物相容性和高亮度而被广泛应用于生物医学领域。已经报道了几种激光结构,包括硅粉和硅膜。然而,激光阈值和发射波长等激光特性与激光器尺寸和工作环境的关系尚未得到深入研究。在这里,我们展示并比较了染料掺杂二氧化硅随机激光器在空气和水中的激光特性。这些激光器存在于薄结构中,即所谓的微片,厚度为1微米,尺寸从30到300微米不等。发现激光阈值(Ith)随激光尺寸的增大而减小,如空气中样品和水中样品,其中A为样品的表面积。对于相同尺寸的样品,水中样品的激光阈值约为空气中样品的3-8倍。此外,随着激光器尺寸的增大,激光峰值波长呈现红移现象。在空气中,当样品表面积从21×103增加到169×103µm2时,记录到8 nm的位移。此外,对于相同尺寸的样品,空气中样品的激光波长与水中样品相比也发生了红移(平均为13 nm)。我们的发现为硅基随机激光器在生物成像和生物传感中的应用提供了有用的信息。
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引用次数: 1
Molecular Dynamic Simulation of Zigzag Silicon Carbide Nanoribbon 之字形碳化硅纳米带的分子动力学模拟
Pub Date : 2021-09-30 DOI: 10.15625/0868-3166/15874
H. Nguyen
The heating process of zigzag silicon carbide nanoribbon (SiCNR) is studied via molecular dynamics (MD) simulation. The initial model contained 10000 atoms is heating from 50K to 6000K to study the structural evolution of zigzag SiCNR. The melting point is defined at 4010K, the phase transition from solid to liquid exhibits the first-order type. The mechanism of structural evolution upon heating is studied based on the radiral distribution functions, coordination number, ring distributions, and angle distributions.
采用分子动力学模拟方法研究了之字形碳化硅纳米带的加热过程。将包含10000个原子的初始模型从50K加热到6000K,研究之字形SiCNR的结构演变。熔点确定为4010K,从固体到液体的相变为一级相变。基于径向分布函数、配位数、环分布和角度分布,研究了加热后结构演化的机理。
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引用次数: 0
Detection of Ultra-Low Concentration of Methylene Blue by Porous Silicon Photonic Crystals Covered With Siver Nanoparticles as Efficient Sers Substrate 包覆银纳米粒子的多孔硅光子晶体检测超低浓度亚甲基蓝
Pub Date : 2021-09-29 DOI: 10.15625/0868-3166/15927
C. D. Vu, T. Nguyen, T. B. Pham, V. Pham, H. Bui, Thi Hong Hanh Vu, Van Hai Pham
 In this work, porous silicon photonic crystals (PSi PhCs) covered by silver nanoparticles (AgNPs) were prepared as surface-enhanced Raman scattering (SERS) substrate to detect methylene blue (MB) at low concentrations. The limit of MB detection in water by the SERS substrate is evaluated to be 10(^{-10}) mol/L. The SERS signal intensities of 446 cm(^{-1}) and 1623 cm(^{-1}) peaks in SERS spectra of MB are fit in exponential functions of concentrations ranging from 10(^{-4}) to 10(^{-10}) mol/L. These results show that the AgNPs on PSi PhCs substrates could be applied in environmental sensing.
在这项工作中,制备了由银纳米粒子(AgNPs)覆盖的多孔硅光子晶体(PSi PhCs)作为表面增强拉曼散射(SERS)衬底,用于检测低浓度的亚甲基蓝(MB)。SERS底物对水中MB的检出限为10 (^{-10}) mol/L。MB SERS光谱中446 cm (^{-1})和1623 cm (^{-1})峰的SERS信号强度与浓度在10 (^{-4}) ~ 10 (^{-10}) mol/L范围内的指数函数拟合。这些结果表明,PSi - PhCs衬底上的AgNPs可以应用于环境传感。
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引用次数: 1
An optimal segmentation method for processing medical image to detect the brain tumor 一种用于医学图像检测的最佳分割方法
Pub Date : 2021-09-29 DOI: 10.15625/0868-3166/15938
Ho Thi Thao, V. C. Phan, Tuan Anh Le, Hong-Ha Nguyen, Quang Thanh Ha, B. Tran
In the field of medical physics, detection of brain tumor from computed tomography (CT) or magnetic resonance (MRI) scans is a difficult task due to complexity of the brain hence it is one of the top priority goals of many recent researches. In this article, we describe a new method that combines four different steps including smoothing, Sobel edge detection, connected component, and finally region growing algorithms for locating and extracting the various lesions in the brain. The computational algorithm of the proposed method was implemented using Insight Toolkit (ITK). The analysis results indicate that the proposed method automatically and efficiently detected the tumor region from the CT or MRI image of the brain. It is very clear for physicians to separate the abnormal from the normal surrounding tissue to get a real identification of related areas; improving quality and accuracy of diagnosis, which would help to increase success possibility by early detection of tumor as well as reducing surgical planning time. This is an important step in correctly calculating the dose in radiation therapy later.
在医学物理领域,由于大脑的复杂性,通过计算机断层扫描(CT)或磁共振(MRI)扫描检测脑肿瘤是一项艰巨的任务,因此它是许多近期研究的首要目标之一。在本文中,我们描述了一种结合四个不同步骤的新方法,包括平滑,索贝尔边缘检测,连接分量,最后是区域增长算法,用于定位和提取大脑中的各种病变。采用Insight Toolkit (ITK)实现了该方法的计算算法。分析结果表明,该方法能够自动有效地从CT或MRI图像中检测出肿瘤区域。对于医生来说,将异常组织与正常的周围组织区分开来以获得相关区域的真实识别是非常清楚的;提高诊断质量和准确性,有助于早期发现肿瘤,增加成功的可能性,减少手术计划时间。这是正确计算放射治疗剂量的重要一步。
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引用次数: 0
The Effect of Unparticle in the Processes (e^{+}e^{-}rightarrow gamma gamma) and (gamma e^{-}rightarrow U^{mu }e^{-}) when the (e^{+},e^{-}) Beams Are Polarized in Unparticle Physics 非粒子物理中(e^{+},e^{-})光束极化时,非粒子对(e^{+}e^{-}rightarrow gamma gamma)和(gamma e^{-}rightarrow U^{mu }e^{-})过程的影响
Pub Date : 2021-09-29 DOI: 10.15625/0868-3166/16024
D. L. Thuy, L. N. Thục
We investigate the influence of unparticle physics on the positron-electron  collider via the scalar unparticle  and electron  exchange. From computing the contribution of the unparticle exchange to the cross-section (CS) as well as evaluating the dependence of differential cross-section (DCS) on the scattering angle , we calculate the production of vector unparticle in the photon-electron  collider in s- and t- channels such as missing energy distribution. Besides, we also found that the polarization of the beams also significantly contributes to the CS and DCS of the unparticle production.
通过标量非粒子和电子交换研究了非粒子物理对正电子对撞机的影响。通过计算非粒子交换对横截面(CS)的贡献以及评估微分横截面(DCS)对散射角的依赖,我们计算了s-和t-通道中光子电子对撞机产生的矢量非粒子,如缺失能量分布。此外,我们还发现光束的偏振对非粒子产生的CS和DCS也有显著的贡献。
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引用次数: 0
Investigation of the FCNC Processes in the 3-4-1-1 Model 3-4-1-1模型中FCNC过程的研究
Pub Date : 2021-09-29 DOI: 10.15625/0868-3166/15893
D. T. Huong, L. Thuy, N. T. Nhuan, H. T. Phuong
We study the FCNC problems in  3-4-1-1  model in a way different from the previous work. The sources of FCNC at the tree-level in the  3-4-1-1 model come from both the gauge and scalar sectors. We show that the most stringently bound on the tree-level FCNC interactions comes from the meson oscillations. The lower bound on the new physics scale is imposed more tightly than in the previous work, (M_{new} > 22) TeV. On the allowed value domain of the new physical scale, we show that the contribution of the tree-level FCNC interactions to the BrB(_s rightarrow mu^+ mu^-)) is negligible.
本文对3-4-1-1模型的FCNC问题进行了不同于以往的研究。在3-4-1-1模型中,树级FCNC的来源来自规范扇区和标量扇区。我们证明了树级FCNC相互作用的最严格约束来自介子振荡。新物理尺度的下限比以前的工作更严格,(M_{new} > 22) TeV。在新物理尺度的允许值域上,我们表明树级FCNC相互作用对BrB (_s rightarrow mu^+ mu^-))的贡献可以忽略不计。
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引用次数: 1
Electronic, Magnetic and Spin-polarized Transport Properties of the Zigzag-Zigzag Penta-graphene Nanoribbon 之字形-之字形五石墨烯纳米带的电子、磁性和自旋极化输运性质
Pub Date : 2021-09-29 DOI: 10.15625/0868-3166/15843
N. Tien, N. T. Tuan, Pham Thi Bich Thao
Electronic, magnetic and spin-polarized transport properties of the zigzag-zigzag pentagraphene nanoribbon are investigated theoretically within the framework of density functional theory combined with non-equilibrium Green’s function formalism. It is found that the spinunpolarized ZZ-PGNR behaves as metal. However, the spin-polarized ZZ-PGNRs show to be the magnetic semiconductor properties. More importantly, for the ZZ-PGNRs based device, the spin-filtering effect occurs strongly near Fermi level. Our findings suggest that ZZ-PGNRs might hold a significant promise for developing spintronic devices.
在密度泛函理论与非平衡格林函数形式相结合的框架下,从理论上研究了之字形五石墨烯纳米带的电子、磁性和自旋极化输运性质。结果表明,自旋极化ZZ-PGNR具有金属性质。而自旋极化的zz - pgnr则表现为磁性半导体性质。更重要的是,对于基于ZZ-PGNRs的器件,自旋滤波效应在费米能级附近强烈发生。我们的研究结果表明,zz - pgnr可能在开发自旋电子器件方面具有重要的前景。
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引用次数: 0
Effect of Geometrical Properties on Localized Surface Plasmon Resonance of Gold Nanoparticles 几何性质对金纳米粒子局域表面等离子体共振的影响
Pub Date : 2021-09-27 DOI: 10.15625/0868-3166/15560
L. Nguyen, Quoc Trung Trinh, Quang Bao Tu, Van-Quynh Nguyen, T. Hoang
This work reportson plasmonic effects (i.e light scattering and absorption properties) induced by two different gold nanoparticles (AuNPs)-shaped: spherical particle and triangular particle. The scattering cross-section and electric field profiles have been investigated by using theboundary element method (MNPBEM toolbox). Two configurations: the isolated AuNPand the coupledtwo-gold NPsystem have been considered to evaluate the localized surface plasmon resonance (LSPR) in eithersingle or coupled AuNPstructures. The effect of the surrounding medium on the scattering behavior of the NPs has also been examined. Then the dependence of “hotspot” intensity on the distance between two NPs has been recognized by mapping the electric field profile. The obtained results can be used as the guidelines for synthesizing AuNP structures to employ LSPR for sensing or other applications.
本文报道了两种不同形状的金纳米粒子(AuNPs):球形粒子和三角形粒子诱导的等离子体效应(即光散射和吸收特性)。利用边界元法(MNPBEM工具箱)研究了散射截面和电场分布。本文考虑了两种结构:孤立的aunp和耦合的双金np体系,以评估单个或耦合aunp结构中的局部表面等离子体共振(LSPR)。研究了周围介质对纳米粒子散射特性的影响。然后,通过绘制电场分布图,识别出“热点”强度与两个NPs之间距离的关系。所得结果可作为利用LSPR进行传感或其他应用的AuNP结构的合成指南。
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引用次数: 0
期刊
Communications in Physics
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