Physics Open最新文献

{"title":"Influence of pH on growth, structural, thermal, linear and nonlinear optical properties of L-asparagine monohydrate single crystal","authors":"V.R. Sagane ,&nbsp;G. Vinitha ,&nbsp;G.G. Muley ,&nbsp;P.M. Wankhade","doi":"10.1016/j.physo.2024.100224","DOIUrl":"10.1016/j.physo.2024.100224","url":null,"abstract":"<div><p>This report presents investigation on influence of pH on growth, structural, thermal, linear and nonlinear optical properties of _L-asparagine monohydrate (LAM) single crystal for the first time. Single crystals of LAM were grown at different pH by solution growth method by allowing slow evaporation of solvent. Crystal grown at pH 6.4 grows slowly as compare to other crystals grown at other pH values. The slight variation in lattice parameters of grown crystals has been confirmed by powder X-ray diffraction study. FT-IR study confirms the presence of functional groups of LAM in all grown crystals. Influence of pH on optical quality of crystals has been discussed. The crystal grown at pH 5.4 has maximum optical transparency and shows 2 and 20 % more transmission than crystals grown at pH 4.4 and 6.4, respectively. Other optical parameters like cutoff wavelength (<em>λ_max</em>), band gap (E_g), linear refractive index (n), reflectance, extinction coefficient (k), electrical susceptibility (χ), optical conductivity(σ_op), electrical conductivity (σ_el) and Urbach energy (E_u) of all crystals have been evaluated from transmission data. The LAM crystal grown at pH 6.4 show high values of third order nonlinear optical parameters, as compare to other grown crystals, that attest its suitability for applications like higher harmonic generation, optical switching, optical limiting and other photonic applications over other grown crystals. Thermal stability of the grown crystals has been attested by TG-DTA study.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"20 ","pages":"Article 100224"},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266603262400022X/pdfft?md5=074d09f3e060e8521ec993a1e4772693&pid=1-s2.0-S266603262400022X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141041158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct oxidative coupling of methane into ethylene in a catalyst-enhanced planar solid oxide fuel cell stack reactor","authors":"Yeheng He ,&nbsp;Fei Meng ,&nbsp;George Xing ,&nbsp;Kefeng Liu ,&nbsp;Shujie Lou ,&nbsp;Haicheng Xiao ,&nbsp;Yongchun Tang","doi":"10.1016/j.physo.2024.100219","DOIUrl":"https://doi.org/10.1016/j.physo.2024.100219","url":null,"abstract":"<div><p>This study presents an efficient method to convert methane into valuable olefins using a Solid Oxide Fuel Cell (SOFC) membrane reactor. Methane, abundant in natural and shale gas, serves as a sustainable feedstock due to its favorable carbon-hydrogen ratio. The SOFC membrane reactor eliminates costly air separation units and safety risks associated with explosive methane-oxygen mixtures. A planar SOFC stack achieves over 30 % methane conversion, 40 % ethylene selectivity, and power generation capabilities. Optimization with mixed-conducting ceramics enhances electrical performance without compromising catalytic activity. The stack's scalability is demonstrated, with the 5-cell configuration surpassing the 2-cell setup. This innovative approach offers a sustainable solution to methane waste, producing high-value chemicals while reducing environmental impact.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"20 ","pages":"Article 100219"},"PeriodicalIF":0.0,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666032624000176/pdfft?md5=3a85da2e69c1ae18a89c50d1b57eb731&pid=1-s2.0-S2666032624000176-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140950843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Information entropies with Varshni-Hellmann potential in higher dimensions","authors":"Etido P. Inyang ,&nbsp;A.E.L. Aouami ,&nbsp;N. Ali ,&nbsp;R. Endut ,&nbsp;N.R. Ali ,&nbsp;S.A. Aljunid","doi":"10.1016/j.physo.2024.100220","DOIUrl":"https://doi.org/10.1016/j.physo.2024.100220","url":null,"abstract":"<div><p>This work investigates the behavior of Shannon entropy and Fisher information for the Varshni-Hellmann potential (VHP) in one and three dimensions using the Nikiforov-Uvarov method. We employ the Greene-Aldrich approximation scheme to obtain the energy eigenvalues and normalized wavefunctions, which are then used to calculate these information-theoretic quantities. Our analysis revealed remarkably similar high-order features in both position and momentum spaces. Notably, our calculations showed enhanced accuracy in predicting particle localization within position space. Furthermore, the combined position and momentum entropies obeyed the lower and upper bounds established by the Berkner-Bialynicki-Birula-Mycieslki inequality. Additionally, for three-dimensional systems, the Stam-Cramer-Rao inequalities were fulfilled for different eigenstates with respect to the calculated Fisher information. It is observed that as the position Fisher entropy decreases, indicating a more precise measurement of position, the momentum Fisher entropy must increase. This implies that the Fisher information regarding momentum decreases, resulting in a decrease in the precision of momentum measurement. This demonstrates how position and momentum uncertainties complement each other in quantum mechanics. Exploring the balance between position and momentum Fisher entropy reveals a fundamental aspect of the uncertainty principle in quantum mechanics, highlighting the restrictions on measuring certain pairs of conjugate variables simultaneously with high precision.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"20 ","pages":"Article 100220"},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666032624000188/pdfft?md5=9545623c45a4d1598d3e8f7e265b5e23&pid=1-s2.0-S2666032624000188-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140950842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insights into the unrevealed physical properties of Sc2Al2C3 compared with other Sc-Al-C systems via ab-initio investigation","authors":"M.A. Rayhan ,&nbsp;M.A. Ali ,&nbsp;N. Jahan ,&nbsp;M.M. Hossain ,&nbsp;M.M. Uddin ,&nbsp;A.K.M.A. Islam ,&nbsp;S.H. Naqib","doi":"10.1016/j.physo.2024.100217","DOIUrl":"https://doi.org/10.1016/j.physo.2024.100217","url":null,"abstract":"<div><p>In this study, an attempt has been made to explore the physical characteristics of Sc₂Al₂C₃, including a first-time investigation of elastic anisotropy, thermodynamic, and optical properties. The physical properties of other Sc-Al-C systems have also been compared. The elastic constants and phonon dispersion curves confirmed the mechanical and dynamical stabilities of Sc₂Al₂C₃, and the estimated lattice parameters agreed well with the experimental results. The semiconducting behavior of Sc₂Al₂C₃ has been confirmed by band structure and density of states calculations. An in-depth discussion is presented on the melting point, minimum thermal conductivity, and the Debye temperature. The Helmholtz free energy (<em>F</em>), internal energy (<em>E</em>), entropy (<em>S</em>), and specific heat capacity (<em>C</em>_v) are also computed from the phonon density of states. The dielectric constant, refractive index, absorption coefficient, photoconductivity, reflectivity, and loss function have also been calculated for the first time. Band structure calculations and optical parameters complement each other very well.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"19 ","pages":"Article 100217"},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666032624000152/pdfft?md5=5d9c5ca98ba2908d9c8a27e6dd1802bf&pid=1-s2.0-S2666032624000152-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140620894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing SOI-MESFET transistor performance at high frequencies by air-oxide layers in the channel and a nickel layer in the box","authors":"Hamed Mohammadi ,&nbsp;Younes Mohammadi","doi":"10.1016/j.physo.2024.100214","DOIUrl":"https://doi.org/10.1016/j.physo.2024.100214","url":null,"abstract":"<div><p>In this paper, we introduce a new transistor structure that has improved alternating current and direct current parameters compared to the basic structure. The cutoff frequency of the proposed structure is 33 GHz, while the cutoff frequency of the basic structure is 25.5 GHz. One important improvement is that the gate-drain parasitic capacitors in the channel area are nearly zero, thanks to the presence of an air layer between the gate and source electrodes and a nickle layer in the burried oxide. In addition to the alternating current parameters, the direct current parameters have also been strengthened. The maximum output power density for the new structure is 1.08 W/mm, compared to 0.455 W/mm for the normal structure. Furthermore, the breakdown voltage in the new structure has increased to 30 V, while the basic structure has a breakdown voltage of 16 V. These improvements are attributed to the transfer of the gate to the source and the increased distance from the drain region, as well as the presence of two layers of oxide and air on both sides of the gate. Consequently, the new structure can effectively operate at high voltages and powers.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"19 ","pages":"Article 100214"},"PeriodicalIF":0.0,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666032624000127/pdfft?md5=3b2737c073eacd1a2c56373998608581&pid=1-s2.0-S2666032624000127-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140548541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of size and shape dependent model for various thermodynamic properties of nanomaterials","authors":"Soni Sharma ,&nbsp;Jagat Pal Singh","doi":"10.1016/j.physo.2024.100215","DOIUrl":"https://doi.org/10.1016/j.physo.2024.100215","url":null,"abstract":"<div><p>The models developed in this work are used to study various thermodynamic properties of nanomaterials. A better agreement between theory and experiment indicates the validity of the proposed model. Since the model is simple and easy to use, we extend the theory to understand, how the thermodynamic properties of different nanomaterials depend on size and shape. The results were compared with previous theoretical work and experimental data. We have concluded that the model predicts a better agreement with previous theoretical work and experimental studies. Current research produces thermodynamic models for the Debye frequency, melting entropy, melting enthalpy, and Einstein temperature. To the best of our knowledge, such models are not yet available in the literature that works well.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"19 ","pages":"Article 100215"},"PeriodicalIF":0.0,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666032624000139/pdfft?md5=b5fd0063d58cb079a3eacaaca82a8dc7&pid=1-s2.0-S2666032624000139-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140547253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computation of hydromagnetic tangent hyperbolic non-Newtonian flow from a rotating non-isothermal cone to a non-Darcy porous medium with thermal radiative flux","authors":"S. Abdul Gaffar ,&nbsp;O. Anwar Bég ,&nbsp;S. Kuharat ,&nbsp;T.A. Bég","doi":"10.1016/j.physo.2024.100216","DOIUrl":"https://doi.org/10.1016/j.physo.2024.100216","url":null,"abstract":"<div><p>A theoretical and numerical study is conducted on nonlinear, steady-state thermal convection boundary layer flow of a magnetized incompressible Tangent Hyperbolic non-Newtonian fluid from a rotating cone to a non-Darcy porous medium. Power-law variation in temperature on the cone surface is considered and thermal radiation heat transfer is also present. The Brinkman-Darcy-Forchheimer model is deployed for the porous medium. The study is motivated by rotational (spin) coating with new emerging magnetic rheological polymers, a process which often utilizes filtration media and high temperatures. The transformed non-dimensional conservation equations are solved numerically subject to physically appropriate boundary conditions using a second-order accurate implicit finite-difference Keller Box technique. The numerical code is validated with previous studies. Extensive visualization of axial, tangential velocity components and temperature distributions with variation in key parameters including Rosseland radiative number, Darcy number, Forchheimer number (non-Darcy inertial parameter), magnetic interaction parameter, tangent-hyperbolic non-Newtonian power-law index and Weissenberg (non-Newtonian) number is included. Additionally, axial and tangential (circumferential) skin friction and Nusselt number values are tabulated for variation in key control parameters. With increasing Weissenberg number, axial velocity is depleted near the cone surface, tangential velocity is suppressed throughout the boundary layer regime and temperature is strongly enhanced. Axial flow is strongly decelerated further from the cone surface with increasing tangent-hyperbolic power-law index and there is also a significant depletion in tangential (swirl) velocity. Temperature is however boosted throughout the boundary layer transverse to the cone surface with a rise in tangent-hyperbolic power-law index. Both tangential and axial velocity are suppressed with increment in magnetic interaction parameter whereas temperature and thermal boundary layer thickness are enhanced. With larger Darcy number (i.e. greater permeability), axial velocity is strongly increased near the cone surface with no tangible modification further from the cone; However tangential velocity is consistently elevated throughout the boundary layer with greater Darcy number whereas temperature is depleted. An increase in Forchheimer number substantially damps both axial and tangential velocity whereas it elevates temperature. Increasing radiative flux strongly energizes the magnetic polymer and elevates temperature but suppresses the axial and tangential velocities. With elevation in non-isothermal wall exponent, axial skin friction is suppressed whereas Nusselt number are elevated at the cone vertex. Further along the cone surface a similar response is observed but there is also a reduction in magnitudes of tangential skin friction.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"19 ","pages":"Article 100216"},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666032624000140/pdfft?md5=eed9564483fec5f5fec14b52bbf0bff3&pid=1-s2.0-S2666032624000140-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140547252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of MOX-fueled VVER-1000 pin cell using ν-TRAC with ENDF/B-VIII.0 library","authors":"Anmol Singh ,&nbsp;Usha Pal ,&nbsp;R. Karthikeyan ,&nbsp;V. Harikrishnan","doi":"10.1016/j.physo.2024.100212","DOIUrl":"https://doi.org/10.1016/j.physo.2024.100212","url":null,"abstract":"<div><p>This paper compares the ENDF/B-VIII.0 library for the MOX-fueled VVER-1000 pin cell benchmark with ENDF/B-VII.0 library using the <span><math><mi>ν</mi></math></span>-TRAC code and demonstrates the modeling capability of the code. <span><math><mi>ν</mi></math></span>-TRAC is a MOC-based code for simulating neutron transport in fuel assembly lattices, with the ability to model cell heterogeneities. The material cross-section significantly impacts neutron transport calculations; therefore, a 172 multigroup cross-section library has been generated using the most recent version of ENDF/B-VIII.0 and the open-source NJOY-2016 code. This nuclear data file includes modifications to the cross-section of major actinides and other light nuclides. Five MOX fuel variants differing in fuel isotopic composition and five states differing in fuel temperature, the moderator, and poison in the moderator are investigated using the most recent library. The impact of new release on the infinite multiplication factor and reactivity change due to the different operating states is studied. Results of <span><math><mi>ν</mi></math></span>-TRAC code using multigroup data libraries based on ENDF/B-VIII.0 and ENDF/B-VII.0 are compared with corresponding results from SCALE/SAS2H, HELIOS, and MCU.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"19 ","pages":"Article 100212"},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666032624000103/pdfft?md5=ccd0d1d368e35955cdb7da9482ca0d5f&pid=1-s2.0-S2666032624000103-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140540006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A review on practical challenges of aerial quantum communication","authors":"Umang Dubey ,&nbsp;Prathamesh Bhole ,&nbsp;Arindam Dutta ,&nbsp;Dibya Prakash Behera ,&nbsp;Vethonulu Losu ,&nbsp;Guru Satya Dattatreya Pandeeti ,&nbsp;Abhir Raj Metkar ,&nbsp;Anindita Banerjee ,&nbsp;Anirban Pathak","doi":"10.1016/j.physo.2024.100210","DOIUrl":"https://doi.org/10.1016/j.physo.2024.100210","url":null,"abstract":"<div><p>The increasing demand for the realization of global-scale quantum communication services necessitates critical investigation for a practical quantum secure communication network that relies on full-time all-location coverage. In this direction, the non-terrestrial quantum key distribution is expected to play an important role in providing agility, maneuverability, relay link, on-demand network, and last-mile coverage. In this work, we have summarized the research and development that has happened until now in the domain of quantum communication using non-terrestrial platforms with a specific focus on the associated challenges and the relevant models. Further, to extend the analysis beyond the existing know-how, a hybrid model involving the features of Vasylyev et al.’s model and Liorni et al.’s model is introduced here. The hybrid model entails us adapting a spherical beam to an elliptic beam approximation and effectively capturing the characteristics of transmittance in densely humid weather conditions and at low altitudes.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"19 ","pages":"Article 100210"},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666032624000085/pdfft?md5=2b873294f9cd3e5f2fa425293f85b082&pid=1-s2.0-S2666032624000085-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140535395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Orthorhombic structure and optoelectronic properties of 3d transition metal diantimonides TMSb2 (TM2+ = V, Cr, Fe)","authors":"M. Musa Saad H.-E. ,&nbsp;A. Almeshal ,&nbsp;B.O. Alsobhi","doi":"10.1016/j.physo.2024.100213","DOIUrl":"https://doi.org/10.1016/j.physo.2024.100213","url":null,"abstract":"<div><p>Inorganic transition-metal materials have attracted widespread attention in the field of opto-spintronics technology due to their unique optical and electronic structures. Tuning the physical properties of diantimonide materials by introducing 3d transition-metal (TM) elements is an effective means to obtain functional compounds to be applicable in the field of optoelectronics devices. In this regard, based on ab-initio calculations, we have investigated the structural, electronic and optical properties of diantimonides TMSb₂ (TM = V, Cr, Fe) according to the density functional theory (DFT) executed in Wien2k package. The Perdew-Burke-Ernzerhof (PBE) functional under generalized gradient approximation (GGA) and (GGA + U) are adopted to carry out the exchange correlation calculations. Our DFT results demonstrate that TMSb₂ crystalize in marcasite structure with orthorhombic symmetry (S.G.: Pnnm, #58, Z = 2). Utilizing the PBE-GGA and PBE-GGA + U methods, we calculated the band structure, as well as the total density of states and partial density of states, which confirm that the TMSb₂ materials exhibit ferromagnetic metallic behavior. In addition, the optical properties are investigated as a function of photon energy and we found that TMSb₂ show favourable absorption, conductivity, refractivity, and reflectivity. The high optoelectronic responses at the low energies make TMSb₂ promising materials for optoelectronics applications.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"19 ","pages":"Article 100213"},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666032624000115/pdfft?md5=c771b4fd056770606b96832c16e1c56b&pid=1-s2.0-S2666032624000115-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140547254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}