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Non-unique detailed constructions of Curzon-Ahlborn cycle on thermodynamic plane 热力学平面上 Curzon-Ahlborn 循环的非唯一详细构造
IF 1.2
Journal of Physics Communications Pub Date : 2024-07-14 DOI: 10.1088/2399-6528/ad5f0f
Yuki Izumida
{"title":"Non-unique detailed constructions of Curzon-Ahlborn cycle on thermodynamic plane","authors":"Yuki Izumida","doi":"10.1088/2399-6528/ad5f0f","DOIUrl":"https://doi.org/10.1088/2399-6528/ad5f0f","url":null,"abstract":"The Curzon-Ahlborn (CA) cycle is a paradigmatic model of endoreversible heat engines, which yields the so-called CA efficiency as the efficiency at maximum power. Due to the arbitrariness of the relationship between the steady temperature and the time taken for the isothermal process of the CA cycle, the constructions of the CA cycle on the thermodynamic plane are not unique. Here, we give some of the detailed constructions of the CA cycle on the thermodynamic plane, using an ideal gas as a working substance. It is shown that these constructions are equal to each other in the maximum power regime in the sense that they achieve the best trade-off between the work and the inverse cycle-time, known as the Pareto front in multi-objective optimization problems.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141721054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anomalous to normal dispersion nonlinear optical dephasing switch in electromagnetically induced transparency using a Kerr effect 利用克尔效应实现电磁诱导透明中的反常到正常色散非线性光学去相开关
IF 1.2
Journal of Physics Communications Pub Date : 2024-07-03 DOI: 10.1088/2399-6528/ad5b39
Ayyappan J and Beena T
{"title":"Anomalous to normal dispersion nonlinear optical dephasing switch in electromagnetically induced transparency using a Kerr effect","authors":"Ayyappan J and Beena T","doi":"10.1088/2399-6528/ad5b39","DOIUrl":"https://doi.org/10.1088/2399-6528/ad5b39","url":null,"abstract":"The atomic decoherence effect (DE) on a Kerr nonlinear (KNL) electromagnetically induced transparency (EIT)is studied in a Δ system. The DE between the ground state hyperfine levels is caused by the dephasing rate γd which dramatically modifies the medium response. It controls the normal dispersive region which shows steep positive slopes for linear response at the line center while the nonlinear response experiences steep negative slopes for low γd. The microwave field strength and γd modify the nonlinear response from the anomalous dispersion to normal dispersion. The calculations show that room-temperature atoms are used to quantify the quantum interference (QI) on linear and nonlinear absorption with γd. The EIT spectrum explores the understanding of the subluminal and superluminal wave propagation of probe signal and this study opens a new pathway for the understanding of the QI devices and their nonlinearities based on EIT.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141550529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Roles of energy and entropy in multiscale dynamics and thermodynamics 能量和熵在多尺度动力学和热力学中的作用
IF 1.2
Journal of Physics Communications Pub Date : 2024-07-02 DOI: 10.1088/2399-6528/ad5b3a
Miroslav Grmela
{"title":"Roles of energy and entropy in multiscale dynamics and thermodynamics","authors":"Miroslav Grmela","doi":"10.1088/2399-6528/ad5b3a","DOIUrl":"https://doi.org/10.1088/2399-6528/ad5b3a","url":null,"abstract":"Multiscale thermodynamics is a theory of relations among levels of description. Energy and entropy are its two main ingredients. Their roles in the time evolution describing approach of a level (starting level) to another level involving less details (target level) is examined on several examples, including the level on which macroscopic systems are seen as composed of microscopic particles, mesoscopic levels as kinetic theory of ideal and van der Waals gases, fluid mechanics, the level of chemical kinetics, and the level of equilibrium thermodynamics. The entropy enters the emergence of the target level in two roles. It expresses internal energy, that is the part of the energy that cannot be expressed in terms of the state variables used on the starting level, and it reveals emerging features characterizing the target level by sweeping away unimportant details. In the case when the target level is a mesoscopic level involving time evolution the roles of the energy and the entropy is taken by two different potentials that are related to their rates.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141522714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamical active particles in the overdamped limit 过阻尼极限中的动态活动粒子
IF 1.2
Journal of Physics Communications Pub Date : 2024-07-02 DOI: 10.1088/2399-6528/ad5b38
Diego M Fieguth
{"title":"Dynamical active particles in the overdamped limit","authors":"Diego M Fieguth","doi":"10.1088/2399-6528/ad5b38","DOIUrl":"https://doi.org/10.1088/2399-6528/ad5b38","url":null,"abstract":"Mobile microscopic bodies, such as motile cells, can be modelled phenomenologically as ‘active particles’ which can move against external forces by depleting an internal energy depot. The microscopic mechanisms underlying such ‘active’ behaviour must ultimately obey fundamental physics: energy depots must actually consist of dynamical degrees of freedom, such as chemical reaction coordinates, which in some way couple to the particle’s motional degrees of freedom. As a step towards connecting phenomenological models with microscopic dynamical mechanisms, recent papers have studied the minimalistic dynamical mechanism of a ‘dynamical active particle’, and shown how nonlinear couplings can allow steady energy transfer from depot to motion, even in the presence of weak dissipation. Most real active particles move through viscous environments, however, and are strongly damped. Here we therefore generalize the dynamical active particle into the overdamped regime. We find that its mechanism still operates, and in particular allows the overdamped active particle to travel just as far against friction as the undamped model, by moving at a slower average speed. Our results suggest that active particle phenomenology can indeed be consistent with comprehensible dynamical mechanisms, even in strongly dissipative environments.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141522713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Wavefunction collapse driven by non-Hermitian disturbance 非赫米提干扰驱动的波函数坍缩
IF 1.2
Journal of Physics Communications Pub Date : 2024-07-01 DOI: 10.1088/2399-6528/ad5b37
Jorge Martínez Romeral, Luis E F Foa Torres and Stephan Roche
{"title":"Wavefunction collapse driven by non-Hermitian disturbance","authors":"Jorge Martínez Romeral, Luis E F Foa Torres and Stephan Roche","doi":"10.1088/2399-6528/ad5b37","DOIUrl":"https://doi.org/10.1088/2399-6528/ad5b37","url":null,"abstract":"In the context of the measurement problem, we propose to model the interaction between a quantum particle and an ‘apparatus’ through a non-Hermitian Hamiltonian term. We simulate the time evolution of a normalized quantum state split into two spin components (via a Stern–Gerlach experiment) and that undergoes a wavefunction collapse driven by a non-Hermitian Hatano-Nelson Hamiltonian. We further analyze how the strength and other parameters of the non-Hermitian perturbation influence the time-to-collapse of the wave function obtained under a Schödinger-type evolution. We finally discuss a thought experiment where manipulation of the apparatus could challenge standard quantum mechanics predictions.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141504443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Broadband dielectric spectroscopy of Nb-doped 0.7BiFeO3-0.3BaTiO3 ceramics 掺铌 0.7BiFeO3-0.3BaTiO3 陶瓷的宽带介电光谱学
IF 1.2
Journal of Physics Communications Pub Date : 2024-06-07 DOI: 10.1088/2399-6528/ad55a2
Vadzim Haronin, Ziqi Yang, R. Grigalaitis, Ilkan Calisir, J. Banys, David Hall
{"title":"Broadband dielectric spectroscopy of Nb-doped 0.7BiFeO3-0.3BaTiO3 ceramics","authors":"Vadzim Haronin, Ziqi Yang, R. Grigalaitis, Ilkan Calisir, J. Banys, David Hall","doi":"10.1088/2399-6528/ad55a2","DOIUrl":"https://doi.org/10.1088/2399-6528/ad55a2","url":null,"abstract":"\u0000 Bismuth ferrite-barium titanate (BF-BT) solid solutions are lead-free ferroelectrics that show great promise as the basis for high temperature piezoelectric transducers. This article investigates the dielectric properties of such materials using broadband dielectric spectroscopy. The study focuses on the re-entrant relaxor ferroelectric behaviour of Nb-doped BF-BT ceramics, exploring a wide frequency range from approximately 20 Hz to 30 GHz and temperature from 200 to 500 K. The results reveal the presence of thermally induced transitions between ordered and disordered states. Quantitative analysis of the dielectric dispersion is accomplished using the Cole-Cole model, modified to account for the contribution from conduction losses at low frequencies/high temperatures. This analysis revealed that the freezing temperature of the polar nanoregions is around 158 K, with an activation energy of 0.194 eV. The findings contribute to understanding the dielectric relaxation mechanisms and thermal evolution of functional properties in BiFeO3-BaTiO3 ceramics.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141374860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Inert structural transition in 4H and 6H SiC at high pressure and temperature: A Raman spectroscopy study 高压高温下 4H 和 6H SiC 的惰性结构转变：拉曼光谱研究
IF 1.2
Journal of Physics Communications Pub Date : 2024-06-04 DOI: 10.1088/2399-6528/ad5410
Shuhou Maitani, Ryosuke Sinmyo, Takayuki Ishii, Kenji Yoza
{"title":"Inert structural transition in 4H and 6H SiC at high pressure and temperature: A Raman spectroscopy study","authors":"Shuhou Maitani, Ryosuke Sinmyo, Takayuki Ishii, Kenji Yoza","doi":"10.1088/2399-6528/ad5410","DOIUrl":"https://doi.org/10.1088/2399-6528/ad5410","url":null,"abstract":"\u0000 We conducted Raman spectroscopy measurements of 4H-SiC and 6H-SiC up to 69 GPa and 1023 K to assess the stability and bonding of SiC at high pressure and temperature. Both optic and acoustic modes were observed at wide pressure and temperature ranges for the first time. The temperature shifts of the Raman frequencies were fitted by the equation with the Bose-Einstein distribution function, and we found that the shifts were almost insensitive to the pressure. The mode Grüneisen coefficients weakly depend on the pressure and temperature, suggesting the sluggish transition of the crystal structure, unlike the previous experiments showing the transition or decomposition of SiC at high pressure and temperature conditions. Inert transitions are confirmed by Raman measurements and annealing experiments using multiple high-pressure apparatuses. The crystallinity may be a hidden critical parameter in the experiments to determine the stable polytypes of SiC under high pressure and temperature.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141267082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simple circuit and experimental proposal for the detection of gauge-waves 探测规波的简单电路和实验建议
IF 1.2
Journal of Physics Communications Pub Date : 2024-05-29 DOI: 10.1088/2399-6528/ad4e98
F Minotti and G Modanese
{"title":"Simple circuit and experimental proposal for the detection of gauge-waves","authors":"F Minotti and G Modanese","doi":"10.1088/2399-6528/ad4e98","DOIUrl":"https://doi.org/10.1088/2399-6528/ad4e98","url":null,"abstract":"Aharonov-Bohm electrodynamics predicts the existence of traveling waves of pure potentials, with zero electromagnetic fields, denoted as gauge waves, or g-waves for short. In general, these waves cannot be shielded by matter since their lack of electromagnetic fields prevents the material from reacting to them. However, a not-locally-conserved electric current present in the material does interact with the potentials in the wave, giving the possibility of its detection. In [1] the basic theoretical description of a detecting circuit was presented, based on a phenomenological theory of materials that can sustain not-locally-conserved electric currents. In the present work we discuss how that circuit can be built in practice, and used for the effective detection of g-waves.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141190421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structural and optical properties of polymer blend nanocomposites based on PVP/PVA incorporated AgNO3 基于含有 AgNO3 的 PVP/PVA 的聚合物共混纳米复合材料的结构和光学特性
IF 1.2
Journal of Physics Communications Pub Date : 2024-05-21 DOI: 10.1088/2399-6528/ad4e97
V. J. Jalal
{"title":"Structural and optical properties of polymer blend nanocomposites based on PVP/PVA incorporated AgNO3","authors":"V. J. Jalal","doi":"10.1088/2399-6528/ad4e97","DOIUrl":"https://doi.org/10.1088/2399-6528/ad4e97","url":null,"abstract":"\u0000 In this study, polymer nanocomposite based on polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), and silver nitrate (AgNO3) has been prepared through chemical reduction rate and casting method for varying concentrations of AgNO3. The PVP/PVA blend consisted of 0.6 wt.% PVP and 0.4 wt.% PVA. Following that, polymer nanocomposites were prepared by incorporating different concentrations of AgNO3 (0, 10, 20, 30, 40, and 50 wt.%) into the polymer blend. The effects of different concentrations of AgNO3 on the structural and optical properties of the PVP/PVA blend were investigated using X-ray diffraction (XRD) and UV-Vis absorption spectroscopy. The XRD analysis demonstrated that increasing the concentration of AgNO3 results in a decrease in the degree of crystallinity from 53.73 in the PVP/PVA blend to 15.77 in the PVP/PVA nanocomposite containing 50 wt.% AgNO3. UV-Vis absorbance spectra were examined to determine optical properties such as the absorption coefficient, absorption edge, optical band gap, and tails of localized states. The results revealed that the increase in AgNO3 concentrations caused a reduction in the absorption edge and optical band gap, alongside an increase in Urbach energy.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141117842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
“Quantum technology will change my life.”Citizens’ attitudes and knowledge of quantum science and technology "量子技术将改变我的生活。"市民对量子科技的态度和认识
IF 1.2
Journal of Physics Communications Pub Date : 2024-05-08 DOI: 10.1088/2399-6528/ad48d3
Anka van de Merbel, Jasper Peer, Sanne JW Willems, Julia Cramer
{"title":"“Quantum technology will change my life.”Citizens’ attitudes and knowledge of quantum science and technology","authors":"Anka van de Merbel, Jasper Peer, Sanne JW Willems, Julia Cramer","doi":"10.1088/2399-6528/ad48d3","DOIUrl":"https://doi.org/10.1088/2399-6528/ad48d3","url":null,"abstract":"\u0000 Technology experts, industry leaders, and policy makers expect that a revolution in quantum technology is imminent. From earlier emerging technologies such as nanotechnology, it has become clear that an early connection with the public is beneficial for the societal impact of the technology. However, little research has yet been done on public attitudes and knowledge of quantum science and technology. In this work, we quantitatively measure the attitude of N = 145 citizens of Leiden (NL) towards quantum science and technology and probe their knowledge on quantum concepts. Results indicate that these citizens have heard about ‘quantum’ through a wide variety of sources. They see quantum as globally important and admirable and most would like to learn more about quantum, but they do feel disconnected from developments in the field. Recommendations for the future include emphasizing any personal connections between citizens and quantum, adapting explanations to fit any level of education, and providing either reliable sources or a framework for critically evaluating quantum-related information.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141001002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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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