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

英文中文

Possibility of a Point Explosion due to the Presence of UV Radiation and Mercury Vapor in the Reaction Medium for Oxidation of Organic Compounds on the Example of Propane 以丙烷为例，有机化合物氧化反应介质中存在紫外线辐射和汞蒸气导致点状爆炸的可能性

IF 0.6 4区物理与天体物理 Q4 Physics and Astronomy

Journal of Contemporary Physics (Armenian Academy of Sciences)

Pub Date : 2023-12-26 DOI: 10.1134/s1068337223030143

G. N. Sargsyan, M. A. Evinyan, P. S. Ghukasyan, H. P. Sargsyan

Abstract

The influence of external factors on the process of low-temperature propane oxidation in the presence of vacuum ultraviolet (UV) radiation (λ = 100–200 nm) and mercury vapor was studied. The modeling of the process of low-temperature propane oxidation taking into account the above external factors was carried out within the framework of the mathematical theory of a point explosion in gases, which allowed consideration of the possibilities for the formation of shock fronts. For numerical computations, the computer program PTS Mathcad Prime 3.1 was used. The results obtained show the possibility of the formation of shock fronts because of the initiation of the process when the reaction medium is exposed to the vacuum UV radiation and mercury vapor and at a certain symmetry of the reaction vessel. The reflection of thermal radiation of the reaction medium and active particles by mercury atoms (vapors) because of their neutrality and focusing of thermal radiation to the center of the reactor because of the symmetry of the reaction vessel, allows one to apply the theory of thermal development of a chain process and to determine the values of parameters for the point explosion. The phenomenon is explained as the formation of a flame front during initiation in the center of the reaction vessel, and mercury vapor reflects the thermal radiation of the reaction to the center of the vessel. When the amount of energy is sufficient for a point explosion, a shock front is generated.

摘要研究了在真空紫外线（UV）辐射（λ = 100-200 纳米）和汞蒸气存在下外部因素对低温丙烷氧化过程的影响。考虑到上述外部因素，低温丙烷氧化过程的建模是在气体点爆炸数学理论的框架内进行的，可以考虑形成冲击锋的可能性。数值计算使用了计算机程序 PTS Mathcad Prime 3.1。所得结果表明，由于反应介质暴露在真空紫外线辐射和汞蒸气中，且反应容器具有一定的对称性，因此有可能形成冲击锋。由于汞原子（蒸气）的中性，反应介质和活性粒子的热辐射会被汞原子（蒸气）反射，并且由于反应容器的对称性，热辐射会集中到反应器的中心，因此可以应用链式过程的热发展理论，确定点式爆炸的参数值。这种现象被解释为在反应容器中心起爆时形成火焰前沿，汞蒸气将反应的热辐射反射到容器中心。当能量足以发生点爆炸时，就会产生冲击前沿。

{"title":"Possibility of a Point Explosion due to the Presence of UV Radiation and Mercury Vapor in the Reaction Medium for Oxidation of Organic Compounds on the Example of Propane","authors":"G. N. Sargsyan, M. A. Evinyan, P. S. Ghukasyan, H. P. Sargsyan","doi":"10.1134/s1068337223030143","DOIUrl":"https://doi.org/10.1134/s1068337223030143","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>The influence of external factors on the process of low-temperature propane oxidation in the presence of vacuum ultraviolet (UV) radiation (λ = 100–200 nm) and mercury vapor was studied. The modeling of the process of low-temperature propane oxidation taking into account the above external factors was carried out within the framework of the mathematical theory of a point explosion in gases, which allowed consideration of the possibilities for the formation of shock fronts. For numerical computations, the computer program PTS Mathcad Prime 3.1 was used. The results obtained show the possibility of the formation of shock fronts because of the initiation of the process when the reaction medium is exposed to the vacuum UV radiation and mercury vapor and at a certain symmetry of the reaction vessel. The reflection of thermal radiation of the reaction medium and active particles by mercury atoms (vapors) because of their neutrality and focusing of thermal radiation to the center of the reactor because of the symmetry of the reaction vessel, allows one to apply the theory of thermal development of a chain process and to determine the values of parameters for the point explosion. The phenomenon is explained as the formation of a flame front during initiation in the center of the reaction vessel, and mercury vapor reflects the thermal radiation of the reaction to the center of the vessel. When the amount of energy is sufficient for a point explosion, a shock front is generated.","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053539","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

Synthesis, Investigation and Neural Network Modeling of the Properties of Sol-Gel ITO/ZnO and ITO/ZnO:Mg Structures 溶胶凝胶 ITO/ZnO 和 ITO/ZnO：Mg 结构的合成、特性研究和神经网络建模

IF 0.6 4区物理与天体物理 Q4 Physics and Astronomy

Journal of Contemporary Physics (Armenian Academy of Sciences)

Pub Date : 2023-12-26 DOI: 10.1134/s1068337223030064

G. Y. Ayvazyan, K. D. Danilchenko, D. L. Kovalenko, A. A. Maevsky, Yu. V. Nikityuk, V. A. Prokhorenko, A. V. Semchenko, V. V. Sidsky, S. A. Khakhomov, V. V. Malyutina-Bronskaya, A. V. Nesterenok

Abstract

The ITO/ZnO and ITO/ZnO:Mg bilayer structures were fabricated by the sol-gel method and their structural and photoelectric properties were experimentally studied. It is shown that, compared with ZnO and ZnO:Mg films without an ITO sublayer, the morphology changes noticeably and the band gap decreases. The I–V characteristics of obtained structures were analyzed in the dark and under the influence of optical radiation of different wavelengths. Using artificial neural networks, their spectral photosensitivity was modeled.

摘要利用溶胶-凝胶法制备了 ITO/ZnO 和 ITO/ZnO:Mg 双层结构，并对其结构和光电特性进行了实验研究。结果表明，与不含 ITO 子层的 ZnO 和 ZnO:Mg 薄膜相比，其形貌发生了明显变化，带隙减小。在黑暗环境下和不同波长的光辐射影响下，对所获得结构的 I-V 特性进行了分析。利用人工神经网络对其光谱光敏性进行了建模。

引用次数: 0

Paramagnetism of Surface Ni Atoms in Ni@C Nanocomposites. “Anomalous” Magnetic Size Effects in Ultrasmall Ni Particles: Manifestations of Surface Magnetic Anisotropy in Squid Magnetometry and FMR Spectra Ni@C 纳米复合材料中表面 Ni 原子的副磁性。超小 Ni 粒子中的 "反常 "磁尺寸效应：鱿鱼磁力仪和调频辐射光谱中表面磁各向异性的表现形式

IF 0.6 4区物理与天体物理 Q4 Physics and Astronomy

Journal of Contemporary Physics (Armenian Academy of Sciences)

Pub Date : 2023-12-26 DOI: 10.1134/s1068337223030155

E. G. Sharoyan, H. T. Gyulasaryan, A. S. Manukyan

Abstract

The dimensional magnetic effects of single-domain Ni nanoparticles encapsulated by a carbon shell (Ni@C nanocomposites) have been studied. The studied samples were obtained by solid-phase pyrolysis of solid solutions of nickel phthalocyanine (NiPc) and metal-free phthalocyanine (H₂Pc): (NiPc)_x(H₂Pc)_1 – x, where 0 ⩽ x ⩽ 1. The Ni concentration in the carbon matrix varied in the range of 0–12 wt %, the sizes of the average diameter of nanoparticles in different samples were from 4 to 40 nm. The paramagnetism of the surface and near-surface atoms of Ni nanoparticles, which is due to the charge transfer from the carbon matrix with the formation of Ni ions has been studied in detail. A method for determining the blocking temperature of superparamagnets in temperature measurements of the paramagnetic susceptibility in the case of high magnetic fields is considered. The magnetic characteristics, which reflect size effects in SQUID magnetometry and FMR, exhibit “anomalous” deviations in the range of ultrasmall particles. These are high values of the blocking temperature, high values of the coercive force, and the ferromagnetic resonance linewidth, as well as a significant shift of the effective g-factor in the FMR spectra. Generalizing equations are presented that include the contributions of the surface magnetic anisotropy along with the bulk magnetocrystalline anisotropy, which is consistent with the experimental results over the entire investigated range from 4 to 40 nm. It is shown that the parameters of the total magnetic resonance spectra (FMR + ESR) are caused by the ferromagnetism of the core of nickel nanoparticles and the paramagnetism of surface and near-surface Ni ions, as well as π-electrons of the organic matrix. A general diagram of the dependence of the coercive force on particle sizes for temperatures lower than the blocking temperature (T < T_b) is also presented.

摘要研究了被碳壳包裹的单域镍纳米粒子（Ni@C 纳米复合材料）的尺寸磁效应。所研究的样品是通过固相热解酞菁镍（NiPc）和无金属酞菁（H2Pc）的固溶体获得的：(NiPc)x(H2Pc)1 - x，其中 0 ⩽ x ⩽ 1。碳基质中的镍浓度变化范围为 0-12 wt %，不同样品中纳米粒子的平均直径大小为 4 至 40 nm。研究人员详细研究了镍纳米粒子表面和近表面原子的顺磁性，这是由于镍离子形成时从碳基体转移电荷所致。研究考虑了在高磁场情况下顺磁感应强度温度测量中确定超顺磁体阻塞温度的方法。在 SQUID 磁强计和调频磁共振中反映尺寸效应的磁特性在超小粒子范围内表现出 "反常 "偏差。这些偏差包括高阻挡温度值、高矫顽力值和铁磁共振线宽，以及调频反射光谱中有效 g 因子的显著偏移。提出的概括方程包括表面磁各向异性和块体磁晶各向异性的贡献，这与从 4 纳米到 40 纳米的整个研究范围内的实验结果是一致的。研究表明，全磁共振光谱（FMR + ESR）的参数是由纳米镍粒子核心的铁磁性、表面和近表面镍离子的顺磁性以及有机基质的 π 电子造成的。此外，还展示了在温度低于阻挡温度（T < Tb）时，矫顽力与颗粒大小的关系总图。

{"title":"Paramagnetism of Surface Ni Atoms in Ni@C Nanocomposites. “Anomalous” Magnetic Size Effects in Ultrasmall Ni Particles: Manifestations of Surface Magnetic Anisotropy in Squid Magnetometry and FMR Spectra","authors":"E. G. Sharoyan, H. T. Gyulasaryan, A. S. Manukyan","doi":"10.1134/s1068337223030155","DOIUrl":"https://doi.org/10.1134/s1068337223030155","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>The dimensional magnetic effects of single-domain Ni nanoparticles encapsulated by a carbon shell (Ni@C nanocomposites) have been studied. The studied samples were obtained by solid-phase pyrolysis of solid solutions of nickel phthalocyanine (NiPc) and metal-free phthalocyanine (H2Pc): (NiPc)x(H2Pc)1 – x, where 0 ⩽ x ⩽ 1. The Ni concentration in the carbon matrix varied in the range of 0–12 wt %, the sizes of the average diameter of nanoparticles in different samples were from 4 to 40 nm. The paramagnetism of the surface and near-surface atoms of Ni nanoparticles, which is due to the charge transfer from the carbon matrix with the formation of Ni ions has been studied in detail. A method for determining the blocking temperature of superparamagnets in temperature measurements of the paramagnetic susceptibility in the case of high magnetic fields is considered. The magnetic characteristics, which reflect size effects in SQUID magnetometry and FMR, exhibit “anomalous” deviations in the range of ultrasmall particles. These are high values of the blocking temperature, high values of the coercive force, and the ferromagnetic resonance linewidth, as well as a significant shift of the effective g-factor in the FMR spectra. Generalizing equations are presented that include the contributions of the surface magnetic anisotropy along with the bulk magnetocrystalline anisotropy, which is consistent with the experimental results over the entire investigated range from 4 to 40 nm. It is shown that the parameters of the total magnetic resonance spectra (FMR + ESR) are caused by the ferromagnetism of the core of nickel nanoparticles and the paramagnetism of surface and near-surface Ni ions, as well as π-electrons of the organic matrix. A general diagram of the dependence of the coercive force on particle sizes for temperatures lower than the blocking temperature (T < Tb) is also presented.","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053484","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

Preparation of the Ferromagnetic Intermetallic Compound Ni3Fe by Solution Combustion Synthesis 利用溶液燃烧合成法制备铁磁性金属间化合物 Ni3Fe

IF 0.6 4区物理与天体物理 Q4 Physics and Astronomy

Journal of Contemporary Physics (Armenian Academy of Sciences)

Pub Date : 2023-12-26 DOI: 10.1134/s1068337223030040

N. H. Amirkhanyan, Y. G. Grigoryan, M. K. Zakaryan, A. S. Kharatyan, H. T. Gyulasaryan, A. B. Harutyunyan

Abstract

The intermetallic compound Ni₃Fe was obtained using the solution combustion synthesis (SCS) method, based on heating an aqueous solution containing nitrates of the corresponding metals and hexamethylenetetramine (HMTA) in a nitrogen atmosphere. The limits for the implementation of a self-propagating reaction in the metal nitrates-HMTA system were determined depending on the amount of HMTA in the reacting mixture (n). It has been established that by changing the value of n it is possible to control phase composition and microstructure of the obtained SCS products. The X-ray examinations have shown that at n = 6, a single-phase target product Ni₃Fe is obtained, and electron microscopic studies indicated that the product is characterized by a pronounced porous structure because of abundant gas evolution during the SCS process. Based on thermogravimetric analyses of the individual compounds and the mixture of reagents (iron and nickel nitrates with HMTA), a possible mechanism for forming the target Ni₃Fe intermetallic compound is discussed. The magnetic characteristics of the synthesized substance have been studied.

摘要利用溶液燃烧合成（SCS）法，在氮气环境中加热含有相应金属的硝酸盐和六亚甲基四胺（HMTA）的水溶液，获得了金属间化合物 Ni3Fe。根据反应混合物中 HMTA 的含量 (n)，确定了在金属硝酸盐-HMTA 系统中进行自推进反应的极限。实验证明，通过改变 n 值，可以控制获得的 SCS 产品的相组成和微观结构。X 射线检查表明，当 n = 6 时，可获得单相目标产物 Ni3Fe，电子显微镜研究表明，由于在 SCS 过程中气体大量进化，该产物具有明显的多孔结构。根据对单个化合物和试剂混合物（铁和镍硝酸盐与 HMTA）的热重分析，讨论了形成目标 Ni3Fe 金属间化合物的可能机制。对合成物质的磁性特征进行了研究。

{"title":"Preparation of the Ferromagnetic Intermetallic Compound Ni3Fe by Solution Combustion Synthesis","authors":"N. H. Amirkhanyan, Y. G. Grigoryan, M. K. Zakaryan, A. S. Kharatyan, H. T. Gyulasaryan, A. B. Harutyunyan","doi":"10.1134/s1068337223030040","DOIUrl":"https://doi.org/10.1134/s1068337223030040","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>The intermetallic compound Ni3Fe was obtained using the solution combustion synthesis (SCS) method, based on heating an aqueous solution containing nitrates of the corresponding metals and hexamethylenetetramine (HMTA) in a nitrogen atmosphere. The limits for the implementation of a self-propagating reaction in the metal nitrates-HMTA system were determined depending on the amount of HMTA in the reacting mixture (n). It has been established that by changing the value of n it is possible to control phase composition and microstructure of the obtained SCS products. The X-ray examinations have shown that at n = 6, a single-phase target product Ni3Fe is obtained, and electron microscopic studies indicated that the product is characterized by a pronounced porous structure because of abundant gas evolution during the SCS process. Based on thermogravimetric analyses of the individual compounds and the mixture of reagents (iron and nickel nitrates with HMTA), a possible mechanism for forming the target Ni3Fe intermetallic compound is discussed. The magnetic characteristics of the synthesized substance have been studied.","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053530","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

Electromagnetic Vector Monochromatic Diffraction Fields and Fields of Charges in Media 电磁矢量单色衍射场和介质中的电荷场

IF 0.6 4区物理与天体物理 Q4 Physics and Astronomy

Journal of Contemporary Physics (Armenian Academy of Sciences)

Pub Date : 2023-12-26 DOI: 10.1134/s1068337223030076

M. K. Balyan

Abstract

Monochromatic electromagnetic fields are considered inside an arbitrarily chosen volume both in homogeneous and inhomogeneous media. Formulas for the fields in the selected volume are obtained using the vector Green’s function of the medium. Two forms of the vector Green’s function are found for homogeneous media. The Kirchhoff and Kirchhoff–Kottler vector formulas for the problem of diffraction by an aperture in an opaque screen are obtained. Because of the use of the vector Green’s function, the Kirchhoff–Kottler formula is obtained directly, without using additional assumptions.

摘要考虑了在均质和非均质介质中任意选择的体积内的单色电磁场。利用介质的矢量格林函数获得了所选体积内的场公式。矢量格林函数的两种形式适用于均质介质。得到了不透明屏幕上一个孔的衍射问题的基尔霍夫和基尔霍夫-科特勒矢量公式。由于使用了矢量格林函数，因此可以直接获得基尔霍夫-科特勒公式，而无需使用额外的假设。

引用次数: 0

Signal-to-Noise Ratio of a Thermoelectric Single-Photon Detector with Different Values of the Physical Parameters of the Sensor Material 传感器材料物理参数值不同时热电单光子探测器的信噪比

IF 0.6 4区物理与天体物理 Q4 Physics and Astronomy

Journal of Contemporary Physics (Armenian Academy of Sciences)

Pub Date : 2023-12-26 DOI: 10.1134/s106833722303012x

A. A. Kuzanyan, V. R. Nikoghosyan, A. S. Kuzanyan, S. R. Harutyunyan

Abstract

The processes of heat propagation in a three-layered detection pixel of a thermoelectric single-photon detector, consisting of an absorber (W), a thermoelectric sensor (La_0.99Ce_0.01B₆), and a heat sink (W) were studied using computer simulation. The absorption of UV photons with an energy of 7.1–124 eV has been studied. The simulation was based on the heat propagation equation from a limited volume. The temporal dependencies of the signal generated on the sensor were examined, and its power was determined. The equivalent power of Johnson and thermal noise was calculated. The signal-to-noise ratio was determined using different values of heat capacity, thermal conductivity, and the Seebeck coefficient of the sensor material. It was shown that the signal-to-noise ratio can be significantly greater than one. The obtained results reveal the prospects of using thermoelectric single-photon detectors as components of photonic integrated circuit.

摘要利用计算机模拟研究了热电单光子探测器三层探测像素（由吸收器（W）、热电传感器（La0.99Ce0.01B6）和散热器（W）组成）中的热传播过程。研究了能量为 7.1-124 eV 的紫外线光子的吸收情况。模拟基于有限体积的热传播方程。研究了传感器上产生的信号的时间依赖性，并确定了其功率。计算了约翰逊噪声和热噪声的等效功率。利用传感器材料的不同热容量、热导率和塞贝克系数值确定了信噪比。结果表明，信噪比可以明显大于 1。研究结果揭示了将热电单光子探测器用作光子集成电路元件的前景。

{"title":"Signal-to-Noise Ratio of a Thermoelectric Single-Photon Detector with Different Values of the Physical Parameters of the Sensor Material","authors":"A. A. Kuzanyan, V. R. Nikoghosyan, A. S. Kuzanyan, S. R. Harutyunyan","doi":"10.1134/s106833722303012x","DOIUrl":"https://doi.org/10.1134/s106833722303012x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>The processes of heat propagation in a three-layered detection pixel of a thermoelectric single-photon detector, consisting of an absorber (W), a thermoelectric sensor (La0.99Ce0.01B6), and a heat sink (W) were studied using computer simulation. The absorption of UV photons with an energy of 7.1–124 eV has been studied. The simulation was based on the heat propagation equation from a limited volume. The temporal dependencies of the signal generated on the sensor were examined, and its power was determined. The equivalent power of Johnson and thermal noise was calculated. The signal-to-noise ratio was determined using different values of heat capacity, thermal conductivity, and the Seebeck coefficient of the sensor material. It was shown that the signal-to-noise ratio can be significantly greater than one. The obtained results reveal the prospects of using thermoelectric single-photon detectors as components of photonic integrated circuit.","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053529","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

Generation of Radiation on Forbidden Transitions in the Laboratory Acoustic Plasma 实验室声学等离子体中禁止跃迁时产生的辐射

IF 0.6 4区物理与天体物理 Q4 Physics and Astronomy

Journal of Contemporary Physics (Armenian Academy of Sciences)

Pub Date : 2023-12-26 DOI: 10.1134/s1068337223030027

A. S. Abrahamyan, A. H. Mkrtchyan, R. Yu. Chilingaryan

Abstract

Experimentally, under laboratory conditions in the nitrogen acoustic plasma in the region of the forbidden lines at 654.81 and 658.36 nm, a spectral emission line of high intensity was obtained (up to 17 stronger than the neighboring lines of the first positive system of nitrogen). The results were obtained both in pure low-pressure nitrogen acoustic plasma (several hundreds of Pa) and various mixtures containing nitrogen, including the CO₂ : N₂ : He = 1 : 1 : 8 mixture. The results obtained are explained by the acoustic plasma state of the discharge and an analog of Rahman scattering, which remove some of the quantum mechanical prohibitions. The possible influence of the Coriolis force is also considered.

摘要在实验室条件下，在氮声等离子体中的 654.81 和 658.36 nm 禁线区域，实验获得了一条高强度的光谱发射线（比氮第一正系的邻近线强达 17）。这些结果是在纯低压氮声等离子体（几百帕）和各种含氮混合物（包括 CO2 : N2 : He = 1 : 1 : 8 混合物）中获得的。放电的声等离子体状态和拉赫曼散射类似物可以解释所获得的结果，它们消除了量子力学的一些限制。此外，还考虑了科里奥利力可能产生的影响。

引用次数: 0

Narrow-Band Terahertz Pulse Generation in Lithium Niobate Crystal Using Phase Mask 利用相位掩膜在铌酸锂晶体中产生窄带太赫兹脉冲

IF 0.6 4区物理与天体物理 Q4 Physics and Astronomy

Journal of Contemporary Physics (Armenian Academy of Sciences)

Pub Date : 2023-12-01 DOI: 10.1134/s1068337223040047

Abstract

Below, we theoretically study the generation of narrowband terahertz (THz) radiation by optical rectification in an artificial periodically poled lithium niobate (LN) crystal with a wide aperture. The latter is formed by placing a multi-slit phase mask in front of a conventional (single-domain) LN crystal. It is shown that the bandwidth of THz generation can be varied over a wide range by changing the linear size of the pump beam in the crystal. In addition, it is possible to tune up the generation frequency in the range of 0.4–0.8 THz by building a mask image in the crystal with different magnifications. According to estimates, the energy of narrowband THz pulses at a frequency of 0.5 THz in a stoichiometric LN crystal at a temperature of 100 K is about 265 μJ for a pump pulse energy of 220 mJ.

摘要下面，我们从理论上研究了在具有宽孔径的人工周期性极化铌酸锂晶体中通过光整流产生窄带太赫兹（THz）辐射的问题。后者是通过在传统（单域）铌酸锂晶体前放置一个多缝相位掩模而形成的。研究表明，通过改变晶体中泵浦光束的线性尺寸，太赫兹产生的带宽可在很大范围内变化。此外，通过在晶体中建立不同放大倍率的掩膜图像，还可以在 0.4-0.8 太赫兹范围内调节产生频率。据估计，在温度为 100 K 的共沸镧系元素晶体中，频率为 0.5 THz 的窄带 THz 脉冲能量约为 265 μJ，而泵浦脉冲能量为 220 mJ。

引用次数: 0

Pair-Interacting Heavy Holes Gas in a Strongly Prolate Ellipsoidal Quantum Dot: Thermodynamic Properties 强椭球量子点中的成对相互作用重空穴气体：热力学性质

IF 0.6 4区物理与天体物理 Q4 Physics and Astronomy

Journal of Contemporary Physics (Armenian Academy of Sciences)

Pub Date : 2023-12-01 DOI: 10.1134/s1068337223040126

Abstract

A somewhat partial pair-interacting gas of heavy holes localized in a highly elongated ellipsoidal Ge/Si quantum dot has been studied in the adiabatic approximation. The interparticle interaction potential is considered within the one-dimensional Moshinsky atom model when the interaction depends on the square of the distance between particles. Within the framework of the Boltzmann approximation, the statistical sum of a somewhat partial hole gas is analytically calculated. The main thermodynamic parameters of the system, such as average energy, free energy, entropy, and heat capacity have been investigated. It is shown that taking into account interparticle interaction results in the ordering of the system, which, in particular, affects the entropy of the gas.

摘要在绝热近似条件下，研究了在一个高度拉长的椭圆形 Ge/Si 量子点中局部存在的重空穴气体。在一维莫辛斯基原子模型中考虑了粒子间的相互作用势，即相互作用取决于粒子间距离的平方。在玻尔兹曼近似的框架内，分析计算了部分空穴气体的统计总和。研究了系统的主要热力学参数，如平均能、自由能、熵和热容量。结果表明，考虑粒子间的相互作用会导致系统的有序化，尤其会影响气体的熵。

引用次数: 0

Absorptive Atom Interferometer 吸收原子干涉仪

IF 0.6 4区物理与天体物理 Q4 Physics and Astronomy

Journal of Contemporary Physics (Armenian Academy of Sciences)

Pub Date : 2023-12-01 DOI: 10.1134/s1068337223040138

Abstract

A new type of atomic interferometer in which the registration is carried out by absorption spectroscopy of probing radiation is theoretically presented. To split the input atomic beam, the interaction with counterpropagating resonant waves is used. In addition, the atom also acquires equal populations at internal energy levels. The interaction with the subsequent traveling wave results in the interference between neighboring momentum states of the atom, and the distribution periodically varies with a strong asymmetry relative to the input momentum value. At the measurement stage, the result of the interference of matter waves is reproduced by the spectral distribution of the probing electromagnetic wave.

摘要从理论上介绍了一种新型原子干涉仪，该干涉仪通过探测辐射的吸收光谱进行登记。为了分割输入的原子束，使用了与反向传播的谐振波的相互作用。此外，原子还在内部能级上获得了等量种群。与后续行进波的相互作用会导致原子相邻动量态之间的干扰，相对于输入的动量值，分布会周期性地发生强烈的不对称变化。在测量阶段，物质波的干涉结果由探测电磁波的频谱分布再现。

引用次数: 0

首页上一页

下一页尾页

类型

全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

Journal of Contemporary Physics (Armenian Academy of Sciences)

全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.

﹀