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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
Communications in Physics Pub Date : 2021-09-30 DOI: 10.15625/0868-3166/16022
K. H. Phan, D. Tran
{"title":"One-loop Form Factors for (Hrightarrow gamma^*gamma^*) in (R_{xi}) Gauge","authors":"K. H. Phan, D. Tran","doi":"10.15625/0868-3166/16022","DOIUrl":"https://doi.org/10.15625/0868-3166/16022","url":null,"abstract":"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).","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87108368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Communications in Physics Pub Date : 2021-09-30 DOI: 10.15625/0868-3166/15991
L. Nguyen
{"title":"Light Scattering by Noble Metallic Nanoparticles for Performance of Compound Soalr Cells Enhancement","authors":"L. Nguyen","doi":"10.15625/0868-3166/15991","DOIUrl":"https://doi.org/10.15625/0868-3166/15991","url":null,"abstract":"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.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"50 6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79530953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Communications in Physics 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
{"title":"Characteristics of Dye-doped Silica Nanoparticles- Based Random Lasers in the Air and Water","authors":"D. Ta, Tam Trong Nguyen, H. H. Mai, T. X. Nguyen, L. H. Nghiem","doi":"10.15625/0868-3166/16091","DOIUrl":"https://doi.org/10.15625/0868-3166/16091","url":null,"abstract":"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.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"245 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74703428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Communications in Physics Pub Date : 2021-09-30 DOI: 10.15625/0868-3166/15874
H. Nguyen
{"title":"Molecular Dynamic Simulation of Zigzag Silicon Carbide Nanoribbon","authors":"H. Nguyen","doi":"10.15625/0868-3166/15874","DOIUrl":"https://doi.org/10.15625/0868-3166/15874","url":null,"abstract":"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.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80879129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Communications in Physics 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
{"title":"Detection of Ultra-Low Concentration of Methylene Blue by Porous Silicon Photonic Crystals Covered With Siver Nanoparticles as Efficient Sers Substrate","authors":"C. D. Vu, T. Nguyen, T. B. Pham, V. Pham, H. Bui, Thi Hong Hanh Vu, Van Hai Pham","doi":"10.15625/0868-3166/15927","DOIUrl":"https://doi.org/10.15625/0868-3166/15927","url":null,"abstract":" 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.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82147707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Communications in Physics 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
{"title":"An optimal segmentation method for processing medical image to detect the brain tumor","authors":"Ho Thi Thao, V. C. Phan, Tuan Anh Le, Hong-Ha Nguyen, Quang Thanh Ha, B. Tran","doi":"10.15625/0868-3166/15938","DOIUrl":"https://doi.org/10.15625/0868-3166/15938","url":null,"abstract":"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.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79765871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Communications in Physics Pub Date : 2021-09-29 DOI: 10.15625/0868-3166/16024
D. L. Thuy, L. N. Thục
{"title":"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","authors":"D. L. Thuy, L. N. Thục","doi":"10.15625/0868-3166/16024","DOIUrl":"https://doi.org/10.15625/0868-3166/16024","url":null,"abstract":"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.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88193387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Communications in Physics Pub Date : 2021-09-29 DOI: 10.15625/0868-3166/15893
D. T. Huong, L. Thuy, N. T. Nhuan, H. T. Phuong
{"title":"Investigation of the FCNC Processes in the 3-4-1-1 Model","authors":"D. T. Huong, L. Thuy, N. T. Nhuan, H. T. Phuong","doi":"10.15625/0868-3166/15893","DOIUrl":"https://doi.org/10.15625/0868-3166/15893","url":null,"abstract":"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.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84800767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Communications in Physics Pub Date : 2021-09-29 DOI: 10.15625/0868-3166/15843
N. Tien, N. T. Tuan, Pham Thi Bich Thao
{"title":"Electronic, Magnetic and Spin-polarized Transport Properties of the Zigzag-Zigzag Penta-graphene Nanoribbon","authors":"N. Tien, N. T. Tuan, Pham Thi Bich Thao","doi":"10.15625/0868-3166/15843","DOIUrl":"https://doi.org/10.15625/0868-3166/15843","url":null,"abstract":"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.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84935389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Communications in Physics Pub Date : 2021-09-27 DOI: 10.15625/0868-3166/15560
L. Nguyen, Quoc Trung Trinh, Quang Bao Tu, Van-Quynh Nguyen, T. Hoang
{"title":"Effect of Geometrical Properties on Localized Surface Plasmon Resonance of Gold Nanoparticles","authors":"L. Nguyen, Quoc Trung Trinh, Quang Bao Tu, Van-Quynh Nguyen, T. Hoang","doi":"10.15625/0868-3166/15560","DOIUrl":"https://doi.org/10.15625/0868-3166/15560","url":null,"abstract":"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.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84437300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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