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Journal of Contemporary Physics (Armenian Academy of Sciences)最新文献

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Gain at a Point and Gain in a Direction for the Fraunhofer Diffraction Pattern of a System of Many Wave Sources 多波源系统的弗劳恩霍夫衍射图样的一点增益和方向增益
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-05-27 DOI: 10.3103/S106833722202013X
A. Zh. Khachatrian
{"title":"Gain at a Point and Gain in a Direction for the Fraunhofer Diffraction Pattern of a System of Many Wave Sources","authors":"A. Zh. Khachatrian","doi":"10.3103/S106833722202013X","DOIUrl":"10.3103/S106833722202013X","url":null,"abstract":"<p>We discuss the question of the nature of the amplification in the direction of wave motion generated by a system of point coherently emitting sources. It is proved that in the Fraunhofer picture this amplification does not have a point nature but produces at all points of the frontal part of the observation area, and by the same amount. The conditions are found under which the wave field within the area perpendicular to the direction of observation and commensurate with the transverse dimensions of the source region can be approximated by a plane wave. It is shown that in some cases it is necessary to have a collecting lens to obtain a local maximum (maximum at a point) in diffraction experiments.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 2","pages":"127 - 132"},"PeriodicalIF":0.6,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5054429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Reflection and Transmission of Radiation of the Structure Crystalline Silicon–Black Silicon–Perovskite 硅-黑硅-钙钛矿结构晶体的辐射反射与透射
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-05-27 DOI: 10.3103/S1068337222020116
F. V. Gasparyan, G. Y. Ayvazyan
{"title":"Reflection and Transmission of Radiation of the Structure Crystalline Silicon–Black Silicon–Perovskite","authors":"F. V. Gasparyan,&nbsp;G. Y. Ayvazyan","doi":"10.3103/S1068337222020116","DOIUrl":"10.3103/S1068337222020116","url":null,"abstract":"<p>The reflection and transmission of crystalline silicon-black silicon-perovskite structures in the absence of optical losses have been investigated by the matrix transfer method. Analytical expressions for the reflection and transmission coefficients are obtained. Low values of transmittance and high values of reflection in the visible region of the spectrum are obtained. It is shown that the use of black silicon layers for the decreasing of the transmission for two-terminal tandem perovskite-silicon solar cells is promising.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 2","pages":"160 - 165"},"PeriodicalIF":0.6,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5059165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
YAG-Yb Ceramics as a Material for Radiation Balanced Lasing YAG-Yb陶瓷作为辐射平衡激光材料
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-05-27 DOI: 10.3103/S1068337222020098
G. Demirkhanyan, B. Patrizi, G. Toci, M. Vannini, A. Pirri, J. Li, Y. Feng, D. Zargaryan, R. Kostanyan
{"title":"YAG-Yb Ceramics as a Material for Radiation Balanced Lasing","authors":"G. Demirkhanyan,&nbsp;B. Patrizi,&nbsp;G. Toci,&nbsp;M. Vannini,&nbsp;A. Pirri,&nbsp;J. Li,&nbsp;Y. Feng,&nbsp;D. Zargaryan,&nbsp;R. Kostanyan","doi":"10.3103/S1068337222020098","DOIUrl":"10.3103/S1068337222020098","url":null,"abstract":"<p>Capabilities of YAG ceramics doped with 10% Yb ions for operation as a radiation balanced laser are evaluated. Parameters of the optimal cooling and radiation balanced lasing for YAG-Yb<sup>3+</sup> ceramics are determined. It is shown, that YAG-Yb ceramics have better characteristics for optical cooling and lasing generation compared to ZBLANP-Yb<sup>3+</sup> and Rb<sub>2</sub>NaYF<sub>6</sub>-Yb<sup>3+</sup>.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 2","pages":"123 - 126"},"PeriodicalIF":0.6,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5052119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Adsorption of Hydrogen Peroxide on Two-Dimensional Transition Metal Chalcogenides 过氧化氢在二维过渡金属硫族化合物上的吸附
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-05-27 DOI: 10.3103/S1068337222020037
M. A. Aghamalyan, V. M. Aroutiounian, E. Sh. Mamasakhlisov, E. V. Sukhanova, A. G. Kvashnin, Z. I. Popov, A. A. Zakaryan
{"title":"Adsorption of Hydrogen Peroxide on Two-Dimensional Transition Metal Chalcogenides","authors":"M. A. Aghamalyan,&nbsp;V. M. Aroutiounian,&nbsp;E. Sh. Mamasakhlisov,&nbsp;E. V. Sukhanova,&nbsp;A. G. Kvashnin,&nbsp;Z. I. Popov,&nbsp;A. A. Zakaryan","doi":"10.3103/S1068337222020037","DOIUrl":"10.3103/S1068337222020037","url":null,"abstract":"<p>Two-dimensional transition metal chalcogenides are promising materials for gas sensors. In this work, we investigate using methods first principles and compare the activity of hexagonal (MX<sub>2</sub>-H), triclinic (MX<sub>2</sub>-T'), and non-stoichiometric M<sub>2</sub>X<sub>3</sub> (where M = Mo, W and X = S, Se) two-dimensional metal chalcogenides in the presence of an H<sub>2</sub>O<sub>2</sub> molecule. Charge transfer, adsorption energy, and electron localization function were calculated for various adsorption structures. As a result, it was shown that during the adsorption of H<sub>2</sub>O<sub>2</sub>, physical adsorption mainly occurs. The lowest adsorption energies were observed in MoS<sub>2</sub>-T', WSe<sub>2</sub>-T' and W<sub>2</sub>Se<sub>3</sub> materials, which is indicating that they may be more efficient in gas sensitive applications.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 2","pages":"170 - 173"},"PeriodicalIF":0.6,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5054702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
X-Rays Diffraction by Excitation of Orthogonal Acoustic Oscillations in a Quartz Crystal 石英晶体中正交声振荡激发的x射线衍射
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-05-27 DOI: 10.3103/S1068337222020086
A. E. Blagov, V. R. Kocharyan, Ya. A. Eliovich, A. V. Targonsky, A. E. Movsisyan, V. A. Korzhov, A. V. Shahverdyan, A. H. Mkrtchyan, M. V. Kovalchuk
{"title":"X-Rays Diffraction by Excitation of Orthogonal Acoustic Oscillations in a Quartz Crystal","authors":"A. E. Blagov,&nbsp;V. R. Kocharyan,&nbsp;Ya. A. Eliovich,&nbsp;A. V. Targonsky,&nbsp;A. E. Movsisyan,&nbsp;V. A. Korzhov,&nbsp;A. V. Shahverdyan,&nbsp;A. H. Mkrtchyan,&nbsp;M. V. Kovalchuk","doi":"10.3103/S1068337222020086","DOIUrl":"10.3103/S1068337222020086","url":null,"abstract":"<p>For the creation of an X-ray acoustic monochromator with the possibility of simultaneous control of the intensity and angular position of X-rays, the distributions of the half-width and intensity of the peaks of the rocking curve along the surface of a quartz single crystal from reflecting atomic planes (11<span>(bar {2})</span>0) in the presence of longitudinal and transverse acoustic oscillations have been studied. It is shown that it is possible to simultaneously excite mutually perpendicular acoustic waves in a single crystal resonator while maintaining the ability to control the parameters of the X-ray beam using each of the types of oscillations. In this case, transverse oscillations “along the thickness” of the crystal make it possible to control the intensity of the diffracted radiation, and longitudinal oscillations “along the length” make it possible to carry out a controlled angular adjustment of the diffracted beam.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 2","pages":"192 - 197"},"PeriodicalIF":0.6,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5054425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modeling of Heat Propagation Processes in Detection Pixel of Thermoelectric Single-Photon Detector with High-Temperature Superconducting Absorber 高温超导吸收体热电单光子探测器探测像元热传播过程建模
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-05-27 DOI: 10.3103/S1068337222020141
A. A. Kuzanyan, V. R. Nikoghosyan, N. G. Margiani, G. A. Mumladze, S. R. Harutyunyan, A. S. Kuzanyan
{"title":"Modeling of Heat Propagation Processes in Detection Pixel of Thermoelectric Single-Photon Detector with High-Temperature Superconducting Absorber","authors":"A. A. Kuzanyan,&nbsp;V. R. Nikoghosyan,&nbsp;N. G. Margiani,&nbsp;G. A. Mumladze,&nbsp;S. R. Harutyunyan,&nbsp;A. S. Kuzanyan","doi":"10.3103/S1068337222020141","DOIUrl":"10.3103/S1068337222020141","url":null,"abstract":"<p>The processes of heat propagation in five-layer detection pixels of the thermoelectric single-photon detector after absorption of 0.8–1000 eV energy photons are investigated by the method of computer simulation. Design of the detection pixel consisting of successive layers on a sapphire substrate of heat sink Bi2223, thermoelectric sensor CeB<sub>6</sub>, absorber Bi2223, and the antireflection layer SiO<sub>2</sub> is proposed. The computer modelling was carried out based on the equation of heat propagation from the limited volume by the use of the three-dimensional matrix method for differential equations. Temporal dependences of the signal intensity for different thicknesses of the layers of the detection pixel are determined. It is shown that the detection pixel SiO<sub>2</sub>/Bi2223/CeB<sub>6</sub>/Bi2223/Al<sub>2</sub>O<sub>3</sub> can register single photons in a wide spectral range from near-IR to X-ray, as well as count the number of simultaneously absorbed photons up to eight. The use of Bi2223 high-temperature superconductor in the design of the detection pixel provides a gigahertz count rate and high system detection efficiency. The simple design of the detection pixel is a prerequisite for the creation of multi-pixel sensors. A detector with such characteristics could be representative of the next generation single-photon detectors in the near future.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 2","pages":"174 - 181"},"PeriodicalIF":0.6,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5055602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
On Nanoteranostics and Breath Analysis of Cancer Tumor 肿瘤的纳米声学与呼吸分析
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-05-27 DOI: 10.3103/S1068337222020074
V. M. Aroutiounian
{"title":"On Nanoteranostics and Breath Analysis of Cancer Tumor","authors":"V. M. Aroutiounian","doi":"10.3103/S1068337222020074","DOIUrl":"10.3103/S1068337222020074","url":null,"abstract":"<p>Large achievements in nanoteranostics and breath analysis of tumors in several last years are reported in this review paper. It is shown that nanoparticles of carbon nanotubes and other therapeutic agents made from new semiconductor materials are very promising for use in such noninvasive and effective therapeutic technologies as photothermal and photodynamic therapies ones. Some semiconductor nanoparticles can be used as biomarkers of a particular type of cancer tumor.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 2","pages":"198 - 208"},"PeriodicalIF":0.6,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5495775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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 Buffer Gas Influence on Magnetically-Induced Transitions in 87Rb Atoms, D2 Line 缓冲气体对87Rb原子磁致跃迁的影响
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-05-27 DOI: 10.3103/S1068337222020165
A. D. Sargsyan, A. S. Sarkisyan, D. H. Sarkisyan
{"title":"Effect of Buffer Gas Influence on Magnetically-Induced Transitions in 87Rb Atoms, D2 Line","authors":"A. D. Sargsyan,&nbsp;A. S. Sarkisyan,&nbsp;D. H. Sarkisyan","doi":"10.3103/S1068337222020165","DOIUrl":"10.3103/S1068337222020165","url":null,"abstract":"<p>Unusual magnetically-induced (MI) transitions <i>F</i><sub>g</sub> =1 → <i>F</i><sub>e</sub> = 3 of the <sup>87</sup>Rb atoms, D<sub>2</sub> lines, forbidden in the absence of magnetic field but becoming significant in magnetic fields &gt;500 G have been studied. The effect of the buffer gas of neon on MI transitions was studied using the process of resonant absorption of laser radiation in a nanocell (NC) with Rb atomic vapors with an NC thickness <i>L</i> = 390 nm and a buffer gas of neon with the pressures of 6 and 20 Torr. The use of NC enables to achieve high spectral resolution and selectively study the MI transitions. It was found that the addition of neon to the cell results in a decrease in the amplitude of the MI transition and its spectral broadening (for some optical processes, the addition of a buffer gas results in an improvement of the parameters). The optimal power of a CW laser for the effective formation of the MI transitions was found to be equal to 10 μW.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 2","pages":"105 - 111"},"PeriodicalIF":0.6,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5054692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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 Carbon Dioxide Interaction with Transition Metal Dichalcogenides by First Principles 用第一性原理研究二氧化碳与过渡金属二硫族化合物相互作用
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-05-27 DOI: 10.3103/S1068337222020025
M. A. Aghamalyan
{"title":"Investigation of Carbon Dioxide Interaction with Transition Metal Dichalcogenides by First Principles","authors":"M. A. Aghamalyan","doi":"10.3103/S1068337222020025","DOIUrl":"10.3103/S1068337222020025","url":null,"abstract":"<p>Two-dimensional transition metal dichalcogenides are widely used in gas sensors. In this work, the interaction of CO<sub>2</sub> molecules with MX<sub>2</sub>-H and MX<sub>2</sub>-T' (where М = W, Mo, аnd X = Se, S) is investigated using first-principle methods. The adsorption energies, charge transfer, and electron localization function are computed for different adsorption structures. It was shown, that during the interaction of CO<sub>2</sub> molecule to all investigated 2D materials, the physisorption takes place. Two-dimensional materials WSe<sub>2</sub>-H and WSe<sub>2</sub>-T' are proposed for use as sensitive materials in impedance gas sensors, because the energy of CO<sub>2</sub> adsorption has the lowest values on these materials.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 2","pages":"166 - 169"},"PeriodicalIF":0.6,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5054424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Study of the Brain Response to the MHz RF Signal 大脑对MHz射频信号响应的研究
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-05-27 DOI: 10.3103/S1068337222020128
T. N. Hovhannisyan
{"title":"Study of the Brain Response to the MHz RF Signal","authors":"T. N. Hovhannisyan","doi":"10.3103/S1068337222020128","DOIUrl":"10.3103/S1068337222020128","url":null,"abstract":"<p>We have studied the nonlinear response of the human brain to an electromagnetic oscillation in high-frequency (HF) range. It has been experimentally shown that when a person is exposed to an HF signal, components appear in the response spectrum of the brain that are correlated with an external radio signal. This means that the human brain reacts to external electromagnetic influences as a non-linear (or parametric) system. The results of this work may be useful for understanding the processes occurring in the human brain and, therefore, may be useful for diagnosing and treating various human diseases associated with the brain.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 2","pages":"182 - 186"},"PeriodicalIF":0.6,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5059148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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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