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Methodological Research to Improve the Extraction of Near-Threshold Quasi-Real Photoproduction of J/Ψ-Meson Process on Nucleons from Experimental Data of Electroproduction on Hydrogen Nuclei, Obtained by CLAS12 Setup 从CLAS12装置获得的氢核电导实验数据中改进提取核子上J/Ψ-介子过程的近阈值准真实光电导的方法学研究
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2022-03-20 DOI: 10.3103/S1068337222010133
D. A. Martiryan
{"title":"Methodological Research to Improve the Extraction of Near-Threshold Quasi-Real Photoproduction of J/Ψ-Meson Process on Nucleons from Experimental Data of Electroproduction on Hydrogen Nuclei, Obtained by CLAS12 Setup","authors":"D. A. Martiryan","doi":"10.3103/S1068337222010133","DOIUrl":"10.3103/S1068337222010133","url":null,"abstract":"<p>This work describes the methodological part of the analysis on the study of the near-threshold quasi-real photoproduction of vector mesons on nucleons. The analysis uses experimental data obtained at the CLAS12 (Cebaf Large Acceptance Spectrometer) of the CEBAF (Current Beam Accelerator Facility) of the Jefferson Laboratory (USA). The experimental data on the scattering of 10.6 GeV electrons by a liquid hydrogen target is investigated. The work describes methods for the selection and identification of the final states of completely exclusive near-threshold reactions of (<i>E</i><sub>γ</sub> ≥ 8.2 GeV) quasi-real (<i>Q</i><sup>2</sup> ≈ 0) photoproduction of <i>J</i>/ѱ mesons. A step-by-step description of the mechanism for identifying the selection of the final state of a lepton pair and the recoil nucleon is presented. It is shown how the parameters of the distributions of kinematic quantities characteristic of the reactions under study change in the course of the analysis.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"57 1","pages":"1 - 11"},"PeriodicalIF":0.6,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5096267","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
Study of Characteristics of the Sensor Detecting of Low Concentration of Ammonia 低浓度氨的传感器检测特性研究
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2021-12-19 DOI: 10.3103/S1068337221040034
M. S. Aleksanyan, A. G. Sayunts, G. H. Shahkhatuni, V. M. Aroutiounian, G. E. Shahnazaryan
{"title":"Study of Characteristics of the Sensor Detecting of Low Concentration of Ammonia","authors":"M. S. Aleksanyan,&nbsp;A. G. Sayunts,&nbsp;G. H. Shahkhatuni,&nbsp;V. M. Aroutiounian,&nbsp;G. E. Shahnazaryan","doi":"10.3103/S1068337221040034","DOIUrl":"10.3103/S1068337221040034","url":null,"abstract":"<p>In this work, the morphology of Fe<sub>2</sub>O<sub>3</sub>:ZnO (60 : 40 mol %) film and gas sensing characteristics to ammonia vapors at different operating temperatures were investigated. The SEM investigation of the surface of the sensitive film of Fe<sub>2</sub>O<sub>3</sub>:ZnO showed that the grain size in the film was about 50 nm. The sensor showed sensitivity to ammonia vapors starting at 200°C and the operating temperature was chosen as 250°C. The low detection limit of the sensor based on Fe<sub>2</sub>O<sub>3</sub>:ZnO is quite low (~14 ppm) and at this concentration of ammonia vapors the resistance of the sensor changed more than 1.5 times. The enhanced parameters of the Fe<sub>2</sub>O<sub>3</sub>:ZnO-based sensor will allow using this structure in ammonia detecting devices.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"56 4","pages":"352 - 358"},"PeriodicalIF":0.6,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4742857","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: 4
Description of Helix-Coil Transition in Heteropolymers in Frame of GMPC GMPC框架内杂聚物螺旋-线圈过渡的描述
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2021-12-19 DOI: 10.3103/S106833722104006X
A. V. Asatryan, A. K. Kalashyan, V. F. Morozov
{"title":"Description of Helix-Coil Transition in Heteropolymers in Frame of GMPC","authors":"A. V. Asatryan,&nbsp;A. K. Kalashyan,&nbsp;V. F. Morozov","doi":"10.3103/S106833722104006X","DOIUrl":"10.3103/S106833722104006X","url":null,"abstract":"<p>The work is devoted to the study of the behavior of heterogeneous biopolymers during the melting of the secondary structure. A random bimodal biopolymer is generated. Each component corresponds to its transfer matrix of GMPC, by multiplying these transfer matrices the free energy of the system is calculated. It is shown that for a length of 5000 repeating units, the reduced free energy does not depend on the realization of the system (primary structure). The corresponding denaturation curves show that the transition point is well defined as a linear combination of the corresponding homopolymers, but the profile of the curves depends on the implementation. The behavior of the number of junctions between the helical and coiled states is calculated. An unexpected result is obtained that the racemic heteropolymer with a length of 5000 repeated units is divided into about 10 sections during the melting process. We associate this with the behavior of correlation in the system, which will be investigated further.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"56 4","pages":"395 - 402"},"PeriodicalIF":0.6,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4747478","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
Hydrogen Peroxide Semiconductor Sensors 过氧化氢半导体传感器
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2021-12-19 DOI: 10.3103/S1068337221040046
V. M. Aroutiounian
{"title":"Hydrogen Peroxide Semiconductor Sensors","authors":"V. M. Aroutiounian","doi":"10.3103/S1068337221040046","DOIUrl":"10.3103/S1068337221040046","url":null,"abstract":"<p>The results of studies of many types of semiconductor H<sub>2</sub>O<sub>2</sub> sensors are discussed in this review of 185 articles about hydrogen peroxide. The properties of electrochemical detectors, sensors based on organic and inorganic materials, graphene, and nano-sensors are analyzed. Optical and fluorescent sensors, detectors made of porous materials, quantum dots, fibers, and spheres are briefly discussed. The results of our studies in the YSU of hydrogen peroxide sensors made from solid solutions of carbon nanotubes with semiconducting metal oxides are also presented in the review. The fundamentals of the manufacture of biomarkers of respiration containing hydrogen peroxide vapors, which make it possible to judge the degree of a person’s illness with various respiratory diseases (asthma, lung cancer, etc.), are discussed.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"56 4","pages":"332 - 351"},"PeriodicalIF":0.6,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4744036","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
A New Level-Crossing Two-State Model Solvable in Terms of Hypergeometric Functions 一种可用超几何函数求解的新的平交两态模型
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2021-12-19 DOI: 10.3103/S1068337221040150
T. A. Shahverdyan, T. A. Ishkhanyan, A. M. Ishkhanyan
{"title":"A New Level-Crossing Two-State Model Solvable in Terms of Hypergeometric Functions","authors":"T. A. Shahverdyan,&nbsp;T. A. Ishkhanyan,&nbsp;A. M. Ishkhanyan","doi":"10.3103/S1068337221040150","DOIUrl":"10.3103/S1068337221040150","url":null,"abstract":"<p>We present a new exactly integrable time-dependent constant-amplitude level-crossing two-state quantum model for which the detuning of the excitation laser field varies with time over a restricted interval. This field configuration is a member of one of the eleven independent classes of general Heun two-state models. We prove that this is the only non-classical <i>unconditionally</i> solvable field configuration among the general Heun classes, solvable in terms of finite sums of Gauss hypergeometric functions. Each of the two fundamental solutions that compose the general solution of the problem is written as an irreducible linear combination of two ordinary hypergeometric functions.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"56 4","pages":"291 - 296"},"PeriodicalIF":0.6,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4747476","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
Theoretical Studies of Nanowire Ion-Sensitive Field Effect Transistor 纳米线离子敏感场效应晶体管的理论研究
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2021-12-19 DOI: 10.3103/S1068337221040071
A. Yesayan, S. Petrosyan, A. Papiyan, J.-M. Sallese
{"title":"Theoretical Studies of Nanowire Ion-Sensitive Field Effect Transistor","authors":"A. Yesayan,&nbsp;S. Petrosyan,&nbsp;A. Papiyan,&nbsp;J.-M. Sallese","doi":"10.3103/S1068337221040071","DOIUrl":"10.3103/S1068337221040071","url":null,"abstract":"<p>The operation principle of a semiconductor nanowire (NW) ion-sensitive field-effect transistor (ISFET), denoted for pH sensing, is studied within the framework of this work. The physical processes in the system are mathematically modelled and presented in details. The dependences of the NW ISFET current-pH characteristics on NW geometrical and physical parameters are analyzed. The plots of the ISFET sensitivity versus pH at different NW radii, the thicknesses of the oxide layer, and the NW doping densities are presented. The obtained results are in qualitative agreement with the experimental data.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"56 4","pages":"324 - 331"},"PeriodicalIF":0.6,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4747473","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
Observation of Electroconvection in Nematic Liquid Crystals by X-Ray Interferometric Method x射线干涉法观察向列液晶中的电对流
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2021-12-19 DOI: 10.3103/S1068337221040083
L. G. Gasparyan, V. P. Mkrtchyan, R. A. Alaverdyan, T. M. Sarukhanyan
{"title":"Observation of Electroconvection in Nematic Liquid Crystals by X-Ray Interferometric Method","authors":"L. G. Gasparyan,&nbsp;V. P. Mkrtchyan,&nbsp;R. A. Alaverdyan,&nbsp;T. M. Sarukhanyan","doi":"10.3103/S1068337221040083","DOIUrl":"10.3103/S1068337221040083","url":null,"abstract":"<p>The electroconvection (EC) phenomenon arising in nematic liquid crystals (NLC) of type E7 under the influence of an external electric field was recorded by the method of X-ray interferometry. The character of the refractive indices of the ordinary (<i>n</i><sub>o</sub>) and extraordinary (<i>n</i><sub>e</sub>) waves is studied, and the moment of the appearance of EC in the NLC is determined. It is shown that the phenomenon of electroconvection occurs when <i>n</i><sub>o</sub> and <i>n</i><sub>e</sub> coincide. It is also shown that in the E7 type NLC, where there are no free charge carriers, under the influence of an external electromagnetic field an EC phenomenon can occur as a consequence of the formation of bound charges.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"56 4","pages":"379 - 383"},"PeriodicalIF":0.6,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4745120","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
Critical Wavelength in the Metal Waveguide Partially Filled with Nonlinear Crystal 非线性晶体部分填充金属波导中的临界波长
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2021-12-19 DOI: 10.3103/S1068337221040113
A. S. Nikoghosyan, V. R. Tadevosyan, G. N. Goltsman, S. V. Antipov
{"title":"Critical Wavelength in the Metal Waveguide Partially Filled with Nonlinear Crystal","authors":"A. S. Nikoghosyan,&nbsp;V. R. Tadevosyan,&nbsp;G. N. Goltsman,&nbsp;S. V. Antipov","doi":"10.3103/S1068337221040113","DOIUrl":"10.3103/S1068337221040113","url":null,"abstract":"<p>The bandwidth in the system of the nonlinear optical crystal partially filling the cross-section of a rectangular metal waveguide is investigated. Partial filling of a metal waveguide with a nonlinear optical crystal is used to ensure the phase matching for an effective generation of THz radiation in a nonlinear crystal when it is illuminated with the femtosecond optical laser pulse. The critical wavelengths of a metal waveguide with a central symmetric arrangement of crystal plates in the waveguide are numerically calculated depending on the degree of partial filling and the dielectric permittivity of the crystal. It is shown that partial filling of the waveguide with crystal results in an expansion of the bandwidth of the fundamental mode of the odd type Н<sub>10</sub>, without improving the propagation conditions for the nearest higher even mode Н<sub>20</sub>, but on the contrary, at a certain degree of filling with the crystal excludes its occurrence.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"56 4","pages":"366 - 370"},"PeriodicalIF":0.6,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5042851","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
Hard X-Ray Phase-Contrast Laboratory Microscope Based on Three-Block Fresnel Zone Plate Interferometer 基于三块菲涅耳带板干涉仪的硬x射线相衬实验室显微镜
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2021-12-19 DOI: 10.3103/S1068337221040058
L. A. Haroutunyan
{"title":"Hard X-Ray Phase-Contrast Laboratory Microscope Based on Three-Block Fresnel Zone Plate Interferometer","authors":"L. A. Haroutunyan","doi":"10.3103/S1068337221040058","DOIUrl":"10.3103/S1068337221040058","url":null,"abstract":"<p>A device based on a three-block Fresnel zone plate interferometer is proposed for hard X‑ray phase-contrast imaging. The device combines a low requirement for the coherence of the initial radiation (the interferometer operates in the amplitude division mode) with an optical magnification of the image. A numerical simulation of the image formation is carried out, taking into account the limited source–interferometer distance, the size and spectral width of the X-ray source. The calculations show that the proposed set-up can be used as a phase-contrast microscope using laboratory hard X-ray sources.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"56 4","pages":"371 - 378"},"PeriodicalIF":0.6,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4744037","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
Weak Localization and Weak Anti-Localization in Ultra Thin Sb2Te3 Nanoplates 超薄Sb2Te3纳米片的弱定位和弱反定位
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2021-12-19 DOI: 10.3103/S1068337221040101
A. A. Kuzanyan, S. R. Harutyunyan
{"title":"Weak Localization and Weak Anti-Localization in Ultra Thin Sb2Te3 Nanoplates","authors":"A. A. Kuzanyan,&nbsp;S. R. Harutyunyan","doi":"10.3103/S1068337221040101","DOIUrl":"10.3103/S1068337221040101","url":null,"abstract":"<div><div><h3>\u0000 <b>Abstract</b>\u0000 </h3><p>The electrical conductivity of Sb<sub>2</sub>Te<sub>3</sub> topological insulator nanoplates of different thickness, grown by vapor-phase deposition, has been studied. The characteristic properties of conductivity are revealed depending on the transverse magnetic field (0–9 T) and temperature (3–300 K). In a magnetic field, ultrathin 11 nm thick Sb<sub>2</sub>Te<sub>3</sub> nanoplates demonstrate a giant anomaly of weak antilocalization, accompanied by the effect of weak localization. A continuous decrease in electrical resistance with decreasing temperature and its sharp drop at the temperature of ∼4 K is a sign of the superconducting transition. Ultrathin samples exhibit a magnetic-field tunable superconductor-insulator transition.</p></div></div>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"56 4","pages":"359 - 365"},"PeriodicalIF":0.6,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4745057","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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