Journal of Experimental and Theoretical Physics最新文献

{"title":"Gibbs Free Energy, Enthalpy, Entropy, and Specific Heat in Constant Pressure of Diatomic Substances Using Improved Tietz-Hua Potential","authors":"A. Mahsoul,&nbsp;A. Avazpour,&nbsp;A. Ghanbari","doi":"10.1134/S1063776126601448","DOIUrl":"10.1134/S1063776126601448","url":null,"abstract":"<p>We have theoretically studied the thermodynamic properties of diatomic molecules such as O₂ (X³ <span>(Sigma _{g}^{ + })</span>), NO (X² <span>({{Pi }_{r}})</span>), and N₂ (X¹ <span>(Sigma _{g}^{ + })</span>) using improved Tietz-Hua potential with statistical mechanics framework. To this end, we have solved the Schrödinger equation with the diatomic molecules interaction model via supersymmetric approach within the non-relativistic quantum mechanics background and have obtained energy eigenvalues of the system. Applying the obtained energy spectrum, we have determined partition function using the Poisson summation formula and have deduced thermodynamic properties of the considered molecules such as Gibbs free energy, enthalpy, entropy and specific heat in constant pressure. We have compared our results with (1) experimental data and (2) Tietz-Hua potential model and have determined absolute average deviations. The comparisons reveal that our results have a good agreement with experimental data. Also, our results show that the improved Tietz-Hua potential has a better results rather than Tietz-Hua potential.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"143 1","pages":"49 - 59"},"PeriodicalIF":1.0,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098611","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}

{"title":"Surface Plasmon Resonance Biosensor for Label-Free Identification of Malignant Breast Cells","authors":"Aseel I. Mahmood,&nbsp;Dunia AlBazaz,&nbsp;Suaad Sahib Hindal,&nbsp;Amal Ibrahim Mahmood,&nbsp;Ashwaq S. Rashid,&nbsp;Haider Mayoof Matrood","doi":"10.1134/S1063776126601187","DOIUrl":"10.1134/S1063776126601187","url":null,"abstract":"<p>This study introduces a simulation model design for a polished-side photonic crystal fiber (PCF) surface plasmon resonance (SPR) sensor for the detection of variation in the refractive index (RI) associated with benign and malignant cells, particularly for breast cancer (MDA-MB-231). PCF sensor, there is a unique air hole configuration, and one of these holes is coated with a 50 nm thin gold layer. The simulation results have shown that there are three distinct peaks of SPR effect in the visible (VIS) and near infrared (NIR) region. This happens because of multimodal coupling and refractive index fluctuations in the surrounding media, both of which exert considerable influence upon sensitivity to the SPR effect. It is worth-noting that the refractive index of malignant cells (1.399 RIU) increases coupling efficiency to a greater extent than benign ones (1.385 RIU), which produces a more prominent loss peak for cancer cells. leading to higher intensity loss peaks for malignant cells. The maximum wavelength and amplitude sensitivity of the proposed sensor were found to be 119.56 µm/RIU and 5584180.14 dB/cm RIU, respectively, with a high spectral resolution of 10^–6. This study will add to the development of advanced photonic biosensing technology for improved cancer diagnostics.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 6","pages":"831 - 838"},"PeriodicalIF":1.0,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098369","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}

{"title":"Experimental and Theoretical Study of O2 Adsorption on the Surfaces of ZnO and CdSe Layers. Regeneration of the Surface, Calculation of Desorption Energies, Ionosorbed Species and Adsorption Kinetic Constants","authors":"R. Ganfoudi,&nbsp;M. Ghers,&nbsp;A. Ain-Souya","doi":"10.1134/S1063776126600960","DOIUrl":"10.1134/S1063776126600960","url":null,"abstract":"<p>In this work, we present a study conducted on oxygen adsorptions and desorptions carried out on zinc oxide layers. The objective is to regenerate the ZnO and CdSe layers surfaces and to determine the orders of magnitude of the interaction energies between oxygen and the superficial states of this materials, and consequently deduce ionosorbed species, thus to show the constants of the adsorption kinetics. We have used the model of T. Wolkenstein, which calculates the thermal desorption energy <i>W</i>_des and the model of J.C. Le Thiesse and R. Lalauze, which make it possible to calculate the constants of the kinetics of adsorption. The desorption signature shows peaks at temperatures <i>T</i>_m where some adsorbed states desorb. The values of <i>W</i>_des found are of the order of 1.25 to 1.50 eV, this temperatures range contains two ionosorbed species <span>({text{O}}_{2}^{ - })</span> and O^–. The theoretical curves adjust, shows the adsorption kinetic constants on ZnO layers at <i>T</i>_a = 78°C at the desorption peak (<i>T</i>_m = 116°C) are <i>a</i> = 0.2, <span>(a')</span> = 0.9 and <i>b</i> = 0.2, <span>(b')</span> = 0.01. At <i>T</i>_a = 110°C at the peak (<i>T</i>_m = 206°C) are <i>a</i> = 28.5, <span>(a')</span> = 0.009 and <i>b</i> = 1, <span>(b')</span> = 1.2. On CdSe layers at <i>T</i>_a = 121°C at the first desorption peak (<i>T</i>_m = 160°C) are <i>a</i> = 13.5, <span>(a')</span> = 0.02 and <i>b</i> = 0.9, <span>(b')</span> = 0.75, at the second peak (<i>T</i>_m = 222°C) are <i>a</i> = 7, <span>(a')</span> = 0.008 and <i>b</i> = 1.2, <span>(b')</span>= 1.5.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 6","pages":"780 - 787"},"PeriodicalIF":1.0,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098199","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}

{"title":"Enhanced Third Harmonic Generation in Thermal Quantum Plasma Driven by Cosh-Gaussian Laser Beams under Relativistic-Ponderomotive Nonlinearities","authors":"Keshav Walia","doi":"10.1134/S1063776126601011","DOIUrl":"10.1134/S1063776126601011","url":null,"abstract":"<p>The current study explores enhanced third harmonic generation in thermal quantum plasma driven by cosh-Gaussian laser beams considering relativistic-ponderomotive nonlinear effects. Laser beam propagation in plasma leads to development of strong intensity gradients due to relativistic mass variation of electrons and ponderomotive force. There is an excitation of electron plasma wave at twice the frequency of fundamental wave due to these intensity gradients through <span>({{vec {V}}} times {{vec {B}}})</span> mechanism. The nonlinear coupling of excited plasma wave and fundamental wave produces third harmonic generation. The nonlinear differential equation representing the dynamics of beam waist as a function of propagation distance and analytically expression for conversion efficiency of third harmonics are derived by employing Wentzel–Krammers–Brillouin and paraxial approaches. Further, the impact of key laser-plasma parameters on focusing behavior of beam and conversion efficiency of third harmonics is also explored.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 6","pages":"822 - 830"},"PeriodicalIF":1.0,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098378","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}

{"title":"Design and Performance Enhancement of a Photonic Crystal and SRR Loaded Microstrip Patch Antenna for X-Band Applications","authors":"S. Mariajeeva,&nbsp;R. Albert William,&nbsp;K. S. Joseph Wilson","doi":"10.1134/S1063776126600832","DOIUrl":"10.1134/S1063776126600832","url":null,"abstract":"<p>This study describes a high-performance microstrip patch antenna operating at 10 GHz, which was constructed utilizing a systematic structural optimization technique to optimize impedance matching and radiation characteristics. The antenna is built on a Rogers RT/5880LZ substrate with a relative permittivity of two, with copper utilized for the radiating patch and ground plane. Starting with a standard rectangular patch antenna, subsequent modifications are made via inset feed optimization, photonic crystal (PC) substrate engineering with periodic holes on a substrate, and split ring resonator (SRR) loading on the patch surface. The simulation results show a considerable improvement in return loss, gain, and directivity. The suggested antenna has a minimum return loss of –55 dB, a peak gain of 7.08 dBi, and a directivity of 8.13 dBi at 10 GHz, making it suitable for X-band wireless and radar applications.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"671 - 676"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014601","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}

{"title":"Selecting the Duration of the Control Interval of the Search Optimization Algorithm under the Conditions of the Nonstationary Nature of the Simulation Modeling Process","authors":"V. Yu. Stroganov,&nbsp;I. S. Belashova","doi":"10.1134/S1063776126601321","DOIUrl":"10.1134/S1063776126601321","url":null,"abstract":"<p>This article examines the assessment of behavior of a search engine optimization algorithm when it is directly integrated into a simulation model of a complex dynamic system and when the search direction is selected over relatively short sample trajectories of the simulation process. In this problem formulation, evaluating the optimization process effectiveness requires constructing probabilistic estimates of the nonstationary simulation process since it has no time to reach a steady state. Therefore, this paper derives analytical expressions for the trend of mean integral estimates of nonstationary processes defined by the simulation model and its variance as a function of the estimation interval. The resulting relationships provide the basis for estimating the convergence rate of search engine optimization.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"622 - 628"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014557","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}

{"title":"Dynamics of Nonlinear Kink Waves and Multi-Kink Wave for (2+1)-Dimensional Extensions of Boussinesq Equation","authors":"Salim S. Mahmood","doi":"10.1134/S1063776126600686","DOIUrl":"10.1134/S1063776126600686","url":null,"abstract":"<p>The (2+1)-dimensional extended Boussinesq equation considering higher-order dispersion and nonlinear coupling terms is a paradigm for complex wave representation that lower-order equations in shallow water, nonlinear optics, and dispersive media are not sufficiently captured. Although this class of models, the joint effects of higher-order terms on multi-wave diversity taken as separate and interacting structures remain insufficiently explored. This study addresses these gaps by structuring the complexity of information related to the exact wave with a rich hierarchical model of exact wave solutions, and methodically considering how higher-order dispersion and nonlinearity control wave structure, stability, and propagation behavior. Different family of solutions showing different and yet qualitatively the same dynamical features localized, periodic, resonant, and fusion–fission wave structures is constructed and depicted using exhaustive two- and three-dimensional graphical descriptions using different parameter regimes. The results show how we can actually modulate wave amplitude, wave width, wave interaction topology, and energy across solution types. The novelty in this work is in the unified analytical treatment of multi-wave interactions including soliton resonance, lump dynamics, breather propagation, and Y-shape/X-shape fusion (fission) phenomena and all based on one higher-dimensional framework, providing novel physical perspective which is directly applicable to wave engineering, plasma physics, and nonlinear optics.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"577 - 588"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014606","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}

{"title":"Nonuniformities in Magnetic Characteristics of Thin Films Produced by Magnetron Sputtering","authors":"B. A. Belyaev,&nbsp;N. M. Boev,&nbsp;A. V. Izotov,&nbsp;G. V. Skomorokhov,&nbsp;P. N. Solovyev","doi":"10.1134/S1063776126700093","DOIUrl":"10.1134/S1063776126700093","url":null,"abstract":"<p>A Halbach magnetic system has been developed that generates a uniform field in the plane of thin magnetic films (TMFs) produced using magnetron sputtering technology. The magnetic field of the system is approximately 60 times stronger than the gradient field of the magnetron over an area of 60 × 48 mm². This significantly reduces the nonuniformity of the TMF magnetic characteristic distribution over the sample area. The system is constructed using four magnetic bars, each composed of eight cobalt–samarium magnets measuring 10 × 10 × 10 mm. The reduction in nonuniformity of the magnetic characteristic distribution over the TMF area has been confirmed by measurements using a scanning ferromagnetic resonance spectrometer on 12 samples, each ~55 nm thick, obtained by simultaneous sputtering a Ni₈₀Fe₂₀ target onto 12 × 12 × 0.5 mm quartz glass substrates.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"689 - 698"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014602","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}

{"title":"Structural Symmetry Breaking Drives Spontaneous Supercurrent and the Superconducting Diode Effect","authors":"Hyun-Tak Kim","doi":"10.1134/S1063776126600820","DOIUrl":"10.1134/S1063776126600820","url":null,"abstract":"<p>The origin of the spontaneous supercurrent in superconductors is theoretically identified. In the superconducting state, a lattice of alternating bipolaron and empty cells forms, distorted by shear stress from the metallic phase as structural symmetry breaking. Bipolarons are bound by a shallow attractive potential <i>V</i>₀ = <i>V</i>_{charge-density-wave} + <i>U</i>_<i>c</i> <i>&lt;</i> 0, where <i>U</i>_<i>c</i> is the critical on-site Coulomb repulsion, on the order of milli-electron volts. When the transmission coefficient <i>T</i> ≈ 1 is achieved by overlap of bipolaron wave functions, coherent tunneling without reflection occurs, producing a spontaneous supercurrent density, <span>({{J}_{{{text{spont}}}}} = 2ensqrt {|{kern 1pt} {{V}_{0}}{text{|/}}{{m}_{0}}} )</span>: <i>V</i>₀ acts as an internal electromotive force. This mechanism explains superconductivity, encompassing the zero resistance, Meissner effect even in the absence of the external magnetic field, and superconducting diode effect.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"515 - 523"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014587","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}

{"title":"Magnetically and Electrically Tunable Magnetooptical Absorption of Circularly Polarized Waves by a Graphene Metasurface in the Terahertz and Far-Infrared Ranges","authors":"G. S. Makeeva,&nbsp;M. S. Nikitin","doi":"10.1134/S1063776126700068","DOIUrl":"10.1134/S1063776126700068","url":null,"abstract":"&lt;p&gt;&lt;i&gt;Background.&lt;/i&gt; The relevance of this topic is dictated by the needs of modern terahertz (THz) technology in the development of materials and techniques enabling the fabrication of efficient and widely tunable THz devices. The aim of this work is to simulate and numerically investigate the interaction of circularly polarized electromagnetic waves with a graphene metasurface and the behavior of magnetooptical (MO) absorption of right- and left-polarized THz radiation under the influence of external magnetic and electric fields in various combinations in the THz and far-IR ranges. &lt;i&gt;Materials and methods.&lt;/i&gt; Metasurfaces based on nanostructured graphene in an external magnetic field have become the materials capable of expanding the scope of magnetoplasmonics to the THz and IR ranges. This is due to the strong MO response upon the excitation of surface magnetoplasmon polaritons. A numerical study of the interaction of circularly polarized THz waves with a graphene metasurface in an external magnetic field has been performed using automated modeling methods by using the CST Microwave Studio software package. The boundary value problem of electrodynamics is solved in the CST MWS program using the numerical finite element method (FEM) in the frequency domain. &lt;i&gt;Results.&lt;/i&gt; The results of modeling the transmission, reflection, and MO absorption spectra of right- and left-polarized waves at normal and oblique incidence on a graphene metasurface in an external magnetic field &lt;i&gt;B&lt;/i&gt;&lt;sub&gt;0&lt;/sub&gt; are obtained as functions of &lt;i&gt;B&lt;/i&gt;&lt;sub&gt;0&lt;/sub&gt; (0, 2, 4, 7, and 10 T) for different incidence angles in the THz and far-IR ranges. The results of a numerical study of electrically and magnetically tunable MO absorption spectra of circularly polarized waves are presented as functions of the Fermi energy &lt;i&gt;E&lt;/i&gt;&lt;sub&gt;F&lt;/sub&gt; (0.2, 0.7, and 1 eV) of graphene for different combinations of applied magnetic and electric fields in the THz and far-IR frequency ranges. &lt;i&gt;Conclusions.&lt;/i&gt; The modeling results show that (i) With increasing &lt;i&gt;B&lt;/i&gt;&lt;sub&gt;0&lt;/sub&gt;, the resonant nature of the MO absorption at the magnetoplasmon resonance frequencies of the right-polarized wave becomes more pronounced, while for the left-polarized wave, the resonant features become less pronounced. (ii) The controllability of the MO absorption of the graphene metasurface by the external magnetic field upon a variation the graphene Fermi energy &lt;i&gt;E&lt;/i&gt;&lt;sub&gt;F&lt;/sub&gt; (by the external electric field) is optimal at &lt;i&gt;E&lt;/i&gt;&lt;sub&gt;F&lt;/sub&gt; = –0.2 eV. With increasing &lt;i&gt;B&lt;/i&gt;&lt;sub&gt;0&lt;/sub&gt; at &lt;i&gt;E&lt;/i&gt;&lt;sub&gt;F&lt;/sub&gt; =–0.2 eV, the frequencies &lt;i&gt;f&lt;/i&gt;&lt;sub&gt;res&lt;/sub&gt; of the magnetoplasmon resonances and the maxima &lt;i&gt;P&lt;/i&gt;&lt;sub&gt;&lt;i&gt;RCP&lt;/i&gt;max&lt;/sub&gt; of the absorption coefficient of the right-polarized wave increase, while for the left-polarized wave, the values of &lt;i&gt;P&lt;/i&gt;&lt;sub&gt;&lt;i&gt;LCP&lt;/i&gt;max&lt;/sub&gt; decrease. (iii) With increasing incidence angle, the values of the MO absorption maxima &lt;i&gt;P&lt;/i&gt;&lt;sub&gt;&lt;i&gt;RCP&lt;","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"142 5","pages":"718 - 734"},"PeriodicalIF":1.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149014556","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}