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Articles de revues sur le sujet « Energy-number field »

Auteur : Grafiati

Publié le 2 juin 2025

Mis à jour le 31 juillet 2025

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1

Bretz, Joseph, C. A. van Eysden, and Bennett Link. "Tangled magnetic field model of QPOs." Monthly Notices of the Royal Astronomical Society 504, no. 4 (2021): 5880–98. http://dx.doi.org/10.1093/mnras/stab1220.

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ABSTRACT The highly tangled magnetic field of a magnetar supports shear waves similar to Alfvén waves in an ordered magnetic field. Here, we explore if torsional modes excited in the stellar interior and magnetosphere can explain the quasi-periodic oscillations (QPOs) observed in the tail of the giant flare of SGR 1900+14. We solve the initial value problem for a tangled magnetic field that couples interior shear waves to relativistic Alfvén shear waves in the magnetosphere. Assuming stellar oscillations arise from the sudden release of magnetic energy, we obtain constraints on the energetics

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Park, Kiwan, and Myung-Ki Cheoun. "Evolution of Kinetic and Magnetic Energy in a Large Magnetic Prandtl Number System." Astrophysical Journal 932, no. 1 (2022): 32. http://dx.doi.org/10.3847/1538-4357/ac66d8.

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Abstract Many regions of the universe are in a state of hot, magnetized, and ionized X-ray emitting plasmas. We numerically simulated the energy spectrum of this highly viscous and conductive system. Without magnetic field, the fluctuating plasma motion decays in a relatively large viscous scale l ν (∼1/k ν ). However, the magnetic field extends the viscous scale to the magnetic diffusivity one l η (∼1/k η ) yielding a unique energy spectrum. Numerical simulation shows that kinetic and magnetic energy spectrum are E V ∼ k −3.7 and E M ∼ k −0.85 in the extended viscous scale regime. To explain

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Faza, Ayman, Majd Batarseh, and Wejdan Abu-Elhaija. "Upgrading power and energy engineering curricula in Jordanian universities: a case study at PSUT." International Journal of Electrical Engineering & Education 54, no. 1 (2016): 57–81. http://dx.doi.org/10.1177/0020720916673648.

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The field of power and energy engineering in Jordan went through a period of decline during the period between 1990 and 2000, which resulted in students of electrical engineering pursuing other fields such as communications and computing, as the advances in the technologies of cellular communications and computer networking created more opportunities for recent graduates, and provided an attractive field of study for the students at that time. However, the recent increase in the prices of oil, and the advances in the technology of renewable energy sources such as solar and wind energy, resulte

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Lin, Tong, Jianyue Zhu, Junfan Zhu, Yaqin Xie, Yao Xu, and Xiao Chen. "Energy-Efficient Resource Allocation for Near-Field MIMO Communication Networks." Sensors 25, no. 14 (2025): 4293. https://doi.org/10.3390/s25144293.

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With the rapid development of sixth-generation (6G) wireless networks and large-scale multiple-input multiple-output (MIMO) technology, the number of antennas deployed at base stations (BSs) has increased significantly, resulting in a high probability that users are in the near-field region. Note that it is difficult for the traditional far-field plane-wave model to meet the demand for high-precision beamforming in the near-field region. In this paper, we jointly optimize the power and the number of antennas to achieve the maximum energy efficiency for the users located in the near-field regio

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Poudel, Parashu Ram. "Unified Field Theory." Himalayan Physics 4 (December 23, 2013): 87–90. http://dx.doi.org/10.3126/hj.v4i0.9435.

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Unified field theory is the long-sought means of tying together all known phenomena to explain the nature and behaviour of all matter and energy in existence. The quest for unification has been the perennial theme of modern physics. The belief that all physical phenomena can be reduced to simple and explained by a smaller number of laws is the central tenet of physics. Such a theory could potentially unlock all the secrets of nature and make a myriad of wonders possible, including such benefits as time travel and an inexhaustible source of clean energy, among many others. This paper aims to ex

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YAMANAKA, Y., H. UMEZAWA, K. NAKAMURA, and T. ARIMITSU. "THERMO FIELD DYNAMICS IN TIME REPRESENTATION." International Journal of Modern Physics A 09, no. 07 (1994): 1153–80. http://dx.doi.org/10.1142/s0217751x94000534.

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Making use of the thermo field dynamics (TFD) we formulate a calculable method for time-dependent nonequilibrium systems in a time representation (t-representation) rather than in the k0-Fourier representation. The corrected one-body propagator in the t-representation has the form of B−1 (diagonal matrix) B (B being a thermal Bogoliubov matrix). The number parameter in B here is the observed number (the Heisenberg number) with a fluctuation. With the usual definition of the on-shell self-energy a self-consistent renormalization condition leads to a kinetic equation for the number parameter. Th

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Ikhdair, Sameer M., and Ramazan Sever. "Relativistic Two-Dimensional Harmonic Oscillator Plus Cornell Potentials in External Magnetic and AB Fields." Advances in High Energy Physics 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/562959.

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The Klein-Gordon (KG) equation for the two-dimensional scalar-vector harmonic oscillator plus Cornell potentials in the presence of external magnetic and Aharonov-Bohm (AB) flux fields is solved using the wave function ansatz method. The exact energy eigenvalues and the wave functions are obtained in terms of potential parameters, magnetic field strength, AB flux field, and magnetic quantum number. The results obtained by using different Larmor frequencies are compared with the results in the absence of both magnetic field (ωL= 0) and AB flux field (ξ=0) cases. Effect of external fields on the

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ZIAEEPOUR, HOURI. "ISSUES WITH VACUUM ENERGY AS THE ORIGIN OF DARK ENERGY." Modern Physics Letters A 27, no. 27 (2012): 1250154. http://dx.doi.org/10.1142/s0217732312501544.

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In this paper, we address some of the issues raised in the literature about the conflict between a large vacuum energy density, a priori predicted by quantum field theory, and the observed dark energy which must be the energy of vacuum or include it. We present a number of arguments against this claim and in favor of a null vacuum energy. They are based on the following arguments: A new definition for the vacuum in quantum field theory as a frame-independent coherent state; results from a detailed study of condensation of scalar fields in Friedmann–Lemaître–Robertson–Walker (FLRW) background p

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Zhang, Qingfeng, and Dongquan Wang. "Field study on the improvement of coal gangue filling using dynamic compaction." PLOS ONE 16, no. 5 (2021): e0250961. http://dx.doi.org/10.1371/journal.pone.0250961.

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In this study, dynamic compaction method was used to treat the gangue hill of the Xinglongzhuang coal mine in China, and the deep compaction of deep coal gangue was examined. The crushing characteristics and improving depth of coal gangue filling under different dynamic compaction conditions were determined. Dynamic compaction tests with different tamping energy were performed to improve the coal gangue filling. In addition, dynamic penetration tests and the foundation bearing capacity were conducted. The relationship between the tamping energy and improvement was investigated, and the optimum

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Jung, Ho Yub, and Kyoung Mu Lee. "Image Segmentation by Edge Partitioning over a Nonsubmodular Markov Random Field." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/683176.

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Edge weight-based segmentation methods, such as normalized cut or minimum cut, require a partition number specification for their energy formulation. The number of partitions plays an important role in the segmentation overall quality. However, finding a suitable partition number is a nontrivial problem, and the numbers are ordinarily manually assigned. This is an aspect of the general partition problem, where finding the partition number is an important and difficult issue. In this paper, the edge weights instead of the pixels are partitioned to segment the images. By partitioning the edge we

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Ho, Vu B. "On the mathematical structure of Einstein field equations and the existence of dark fields." Physics Essays 36, no. 3 (2023): 269–73. http://dx.doi.org/10.4006/0836-1398-36.3.269.

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In this work, we examine the possible existence of dark fields by showing that an energy‐momentum tensor associated with a dark field can be introduced into Einstein field equations of general relativity, in which the trace of the energy‐momentum of the dark field is identified with the cosmological constant. The introduction of dark fields into Einstein field equations is made possible by establishing field equations for the Ricci curvature tensor, which have similar mathematical structure to Maxwell field equations of electromagnetism. We also establish a system of field equations for the Ri

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Solaimani, M. "Refractive index changes in constant total effective length GaN/AlN multiple quantum well systems under external electric field." International Journal of Modern Physics B 28, no. 29 (2014): 1450204. http://dx.doi.org/10.1142/s021797921450204x.

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In this work we have investigated the effect of external electric field on the electronic structure and refractive index changes of a GaN/AlN constant total effective length multiple quantum well. A decreasing oscillatory behavior for energy levels was seen when the electric field increased and in some energy values the energy levels intersected. By increasing the number of wells, oscillator strength dropped suddenly and moved to higher electric field in a critical electric field. By using the number of wells and the total length of the structure as two tuning tools, we were able to select our

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Mishra, L. N., and Å. Fredriksen. "Measurement of Plasma Potential, Ion Saturation Current and Mach number using Retarding Field Energy Analyzer." Journal of Nepal Physical Society 7, no. 2 (2021): 76–80. http://dx.doi.org/10.3126/jnphyssoc.v7i2.38626.

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This article deals about the experimental measurement of plasma potential, ion saturation current and Mach number obtained with the variation of power, operating gas pressure and radial position using retarding field energy analyzer. We employed a retarding field energy analyzer by rotating with different angles such as 0° (facing toward source), 90° (facing side walls) and 180° (facing opposite the source). The coil current is varied from 0 to 15 A to produce the magnetic field which is used to confine the plasma. The flow of plasma has been characterized which was found to be subsonic. The l

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Stewart, Dudley. "Smart City Field Notes One." International Journal of Urban Planning and Smart Cities 2, no. 2 (2021): 110–20. http://dx.doi.org/10.4018/ijupsc.2021070107.

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This is the first of a number of reports emerging from the author's 50 years of continuous action in the arena of sustainable energy field laboratories. This paper is a fresh guidance product of action-learning in an organically organised living lab which has been dedicated to the phased eradication of the use of fossil fuel as the dominant, and most destructive, source of Earth's energy. During the course of the past five decades, this old-style living lab, made-up of many smaller labs, has been migrating from rural to urban solutions, and it has been at the critical junctures of a number of

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Ghasemi, Seyed Abolfazl, Amir Moslehi, and Samira Faghih. "Collimation of fast electron beams by strong external magnetic field in laser–solid interaction using Monte Carlo simulation." Laser Physics Letters 19, no. 6 (2022): 066001. http://dx.doi.org/10.1088/1612-202x/ac642b.

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Abstract In this paper, the effect of the external magnetic field on the fast electron beam angular spread and spatial divergence in laser–solid interaction were investigated and energy deposition of these electrons into the high-density fuel was evaluated using Monte Carlo simulation by Geant4 simulation toolkit. In our simulation, two types of the energy distribution function, exponential energy distribution, and quasi-two temperature energy distribution function, for electrons were considered. Our simulations in the presence of an external magnetic field B ext = 0 − 10 kT show that the dyna

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Faniandari, Suci, Erik Bhekti Yutomo, and Oki Ade Putra. "Energy Analysis of RbH, NI, And ScI Diatomic Molecules with Position-Dependent Mass." International Journal of Research and Review 12, no. 5 (2025): 39–47. https://doi.org/10.52403/ijrr.20250505.

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In this study, we analyze the energy level of the diatomic molecules in the case of a non-relativistic quantum system influenced by an external magnetic field and exponential potential. The energy eigenvalue as the solution of the Schrödinger equation in the cosmic-string spacetime was simulated numerically. The energy spectrum was calculated for the three selected diatomic molecules involving RbH, NI, ScI. The influence of the quantum number, potential parameter, and the external magnetic field is considered in this computation to recover the behavior of the particle. The results showed that

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Heckotter, J., D. Frohlich, M. Abmann, and M. Bayer. "Influence of magnetic confinement on the yellow excitons in cuprous oxide subject to an electric field." Физика твердого тела 60, no. 8 (2018): 1580. http://dx.doi.org/10.21883/ftt.2018.08.46247.11gr.

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AbstractWe study the spectrum of the yellow exciton series in crossed electric and magnetic fields. The electric field, applied along the optical axis, tilts the Coulomb potential between electron and hole, so that at sufficiently high fields exciton dissociation becomes possible, roughly when the electric dipole interaction energy exceeds the binding energy of an exciton state with principal quantum number n . For an applied voltage of U = 20 V all excitons above n = 6 are dissociated. Additional application of a magnetic field normal to the optical axis introduces magnetic confinement, due t

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18

Xiao, J. H., Y. C. Du, H. Q. Li, Y. T. Zhao, and L. Sheng. "Ultrafast high energy electron lens radiography suitable for transient electromagnetic field diagnosis." Journal of Instrumentation 17, no. 01 (2022): P01033. http://dx.doi.org/10.1088/1748-0221/17/01/p01033.

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Abstract Transient electromagnetic fields — during or after laser/particle beam-target interaction — are a significant and hardly explored parameter. This paper proposes a new method for measuring transient electromagnetic fields, based on ultrafast high-energy electron lens radiography, that has a high tolerance for matter in the diagnosed region. With this method, a continuous point strength diagnosis helps to obtain delicate. Furthermore, dual-band diagnosis can be used to determine the field direction. To verify its feasibility, a 50 MeV electron lens radiography beamline was designed and

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LIN, K. Y., та F. Y. WU. "ISING MODEL IN THE MAGNETIC FIELD iπkT/2". International Journal of Modern Physics B 02, № 03n04 (1988): 471–81. http://dx.doi.org/10.1142/s0217979288000330.

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It is shown that the free energy and the magnetization of an Ising model in the magnetic field H = iπkT/2 can be obtained directly from corresponding expressions of these quantities in zero field, provided that the latter are known for sufficiently anisotropic interactions. Using this approach we derive explicit expressions of the free energy and the magnetization at H = iπkT/2 for a number of two-dimensional lattices.

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20

Lestari, Dwi, L. K. Permatahati, A. Suparmi, C. Cari, and F. N. Setyanto. "Study of the dirac equation with hylleraas potential and Position-Dependent Mass (PDM) under the influence of the external magnetic field." Journal of Physics: Conference Series 2945, no. 1 (2025): 012025. https://doi.org/10.1088/1742-6596/2945/1/012025.

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Abstract We investigated the solutions of the Dirac equation with the position-dependent mass (PDM) and external magnetic field particles for the Hylleraas potential using the Nikiforov-Uvarov (NU) method. The relativistic energy eigenvalues and the wave function were obtained Analytically. We compute the energy spectra and the wave function using Mathlab software. The plots of the energy spectra were presented with respect to various values of the quantum number, magnetic field, PDM parameters, and potential parameters. The influence of those parameters on energy levels was analyzed. From the

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Deisher, Amanda J., Thomas J. Whitaker, Chris J. Beltran, Robert L. Foote, Michael G. Haddock, and Anita Mahajan. "Technical Delivery Parameters of 2000 Proton Treatment Courses." International Journal of Particle Therapy 6, no. 3 (2019): 27–34. http://dx.doi.org/10.14338/ijpt-19-00066.1.

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Abstract Purpose: To summarize the technical delivery parameters of proton plans delivered at the Mayo Clinic in Rochester, Minnesota. Materials and Methods: The database of treated patient proton plans was queried to extract field parameters such as gantry angle, patient support angle, minimum and maximum water-equivalent depth (WED) treated, number of layers, field size, patient orientation, and monitor units. The plans were analyzed in aggregate, by disease site, and by fractionation. Results: There were 2963 proton plans for 2023 distinct treatment sites delivered between June 2015 and Sep

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Song, Kewei, Wenkai Li, Yang Zhou, and Yuanru Lu. "Numerical Study of Buoyancy Convection of Air under Permanent Magnetic Field and Comparison with That under Gravity Field." Mathematical Problems in Engineering 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/494585.

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Magnetothermal free convection of air in a square enclosure under a nonuniform magnetic field provided by a permanent neodymium-iron-boron magnet is numerically studied. The natural convection under the gravity field alone is also studied for comparison. The physical fields of magnetizing force, velocity, and temperature as well as the local distribution characteristic of Nusselt number are all presented in this paper. The results show that the buoyancy convection of air in the square enclosure under magnetic field is quite different from that under the gravity field. The local value of Nussel

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Fewster, Christopher J., and Eleni-Alexandra Kontou. "A semiclassical singularity theorem." Classical and Quantum Gravity 39, no. 7 (2022): 075028. http://dx.doi.org/10.1088/1361-6382/ac566b.

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Abstract Quantum fields do not satisfy the pointwise energy conditions that are assumed in the original singularity theorems of Penrose and Hawking. Accordingly, semiclassical quantum gravity lies outside their scope. Although a number of singularity theorems have been derived under weakened energy conditions, none is directly derived from quantum field theory. Here, we employ a quantum energy inequality satisfied by the quantized minimally coupled linear scalar field to derive a singularity theorem valid in semiclassical gravity. By considering a toy cosmological model, we show that our resul

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BENDER, MICHAEL. "EVOLUTION OF SHELL CLOSURES IN MEAN-FIELD-BASED MODELS: CONTRIBUTIONS BEYOND THE STATIC SPHERICAL MEAN FIELD TO OBSERVABLE SIGNATURES OF SHELL EVOLUTION." International Journal of Modern Physics E 18, no. 10 (2009): 2093–97. http://dx.doi.org/10.1142/s0218301309014354.

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A summary is given of recent work that provides evidence that the functional form of of the nuclear energy density functional, the rearrangement of the self-consistent mean field when changing neutron and proton number, and explicit fluctuations in collective degrees of freedom should be considered simultaneously when analyzing the evolution of shell structure in terms of nuclear energy density functional methods.

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Peter, William, and Anthony L. Peratt. "Thermalization of synchrotron radiation from field-aligned currents." Laser and Particle Beams 6, no. 3 (1988): 493–501. http://dx.doi.org/10.1017/s0263034600005413.

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Three-dimensional plasma simulations of interacting galactic-dimensioned current filaments show bursts of synchroton radiation of energy density 1·2 ×10−13 erg/cm3 which can be compared with the measured cosmic microwave background energy density of 1·5 × 10−13 erg/cm3. However, the synchrotron emission observed in the simulations is not blackbody. In this paper, we analyze the absorption of the synchrotron emission by the current filaments themselves (i.e., self-absorption) in order to investigate the thermalization of the emitted radiation. It is found that a large number of current filament

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Jiang, Yuyan, and Xueli Liu. "A Bibliometric Analysis and Disruptive Innovation Evaluation for the Field of Energy Security." Sustainability 15, no. 2 (2023): 969. http://dx.doi.org/10.3390/su15020969.

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The field of energy security is an important, complex and evolving field with important implications at the international, national and regional levels. Considering that no scholars have conducted bibliometric studies on the current energy security field, the authors of this study chose to use a bibliometric approach to conduct a search on the Web of Science using “energy security” as the keyword, and they conducted a systematic review of 5236 papers published between 2005 and 2022 to determine the current status and development of research in the field of energy security by addressing the fol

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KIRITSIS, ELIAS B. "NON-STANDARD BOSONIZATION TECHNIQUES IN CONFORMAL FIELD THEORY." Modern Physics Letters A 04, no. 05 (1989): 437–43. http://dx.doi.org/10.1142/s0217732389000538.

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Li, Hongjun, Xingzhang Li, Jin Zhan, Wei Chen, and Wangyuan Zong. "Study of Turbulent Kinetic Energy and Dissipation Based on Fractal Impeller." Sustainability 15, no. 10 (2023): 7772. http://dx.doi.org/10.3390/su15107772.

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Turbulent kinetic energy and turbulent dissipation are important aspects of the flow field characteristics, which can affect the wear and energy loss in mixing equipment. In order to increase equipment wear and energy loss in the mixing process, a series of fractal impellers were designed based on the fractal iteration method, and the effects of the fractal dimension and the number of iterations on the flow field characteristics were investigated. Firstly, the distribution characteristics of turbulent kinetic energy and its uniformity were studied. Then, the distribution characteristics of the

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Zhu, Cui, Zhi Fu Gao, Xiang Dong Li, Na Wang, Jian Ping Yuan, and Qiu He Peng. "Modified Fermi energy of electrons in a superhigh magnetic field." Modern Physics Letters A 31, no. 11 (2016): 1650070. http://dx.doi.org/10.1142/s021773231650070x.

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In this paper, we investigate the electron Landau level stability and its influence on the electron Fermi energy, [Formula: see text], in the circumstance of magnetars, which are powered by magnetic field energy. In a magnetar, the Landau levels of degenerate and relativistic electrons are strongly quantized. A new quantity [Formula: see text], the electron Landau level stability coefficient is introduced. According to the requirement that [Formula: see text] decreases with increasing the magnetic field intensity [Formula: see text], the magnetic field index [Formula: see text] in the expressi

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Dzhunushaliev, Vladimir, and Vladimir Folomeev. "Dipole-like Field Configurations in Nonperturbative Vacuum." Symmetry 14, no. 12 (2022): 2659. http://dx.doi.org/10.3390/sym14122659.

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A model of nonperturbative vacuum in SU(2) Yang–Mills theory coupled to a nonlinear spinor field is suggested. By analogy with Abelian magnetic monopole dominance in quantum chromodynamics, it is assumed that the dominant contribution to such a vacuum comes from dipole-like field configurations existing in this theory. Using an assumption of the behavior of the number density of dipole-like field configurations whose energy approaches infinity, we derive an approximate expression for the energy density of such nonperturbative vacuum symmetrical under translation that turns out to be finite, un

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Saranyasoontorn, Korn, and Lance Manuel. "Low-Dimensional Representations of Inflow Turbulence and Wind Turbine Response Using Proper Orthogonal Decomposition." Journal of Solar Energy Engineering 127, no. 4 (2005): 553–62. http://dx.doi.org/10.1115/1.2037108.

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A demonstration of the use of Proper Orthogonal Decomposition (POD) is presented for the identification of energetic modes that characterize the spatial random field describing the inflow turbulence experienced by a wind turbine. POD techniques are efficient because a limited number of such modes can often describe the preferred turbulence spatial patterns and they can be empirically developed using data from spatial arrays of sensed input/excitation. In this study, for demonstration purposes, rather than use field data, POD modes are derived by employing the covariance matrix estimated from s

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Jafri, Hasnain Mehdi, Congpeng Zhao, Houbing Huang, and Xingqiao Ma. "Effect of Background Magnetic Field on Type-II Superconductor under Oscillating Magnetic Field Simulated Using Ginzburg-Landau Model." Advances in Condensed Matter Physics 2018 (November 12, 2018): 1–7. http://dx.doi.org/10.1155/2018/7615862.

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Cubic superconducting sample was simulated using time-dependent Ginzburg-Landau model under oscillating magnetic field with and without additional background static magnetic field. Vortex dynamics including entrance and exit from the sample was simulated. Magnetization and carrier concentration densities of the sample were studied as a function of external magnetic field variations. Anomalies in carrier concentration density were observed at certain values of the magnetic field which were correlated with the entrance and exit processes of vortices. Area swept by superconductor magnetization wi

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Denis, Olivier. "Informational Nature of Dark Matter and Dark Energy and the Cosmological Constant." IPI Letters 1 (December 17, 2023): 66–77. http://dx.doi.org/10.59973/ipil.36.

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In this article, realistic quantitative estimation of dark matter and dark energy considered as informational phenomena have been computed, thereby explaining certain anomalies and effects within the universe. Moreover, by the same conceptual approach, the cosmological constant problem has been reduced by almost 120 orders of magnitude in the prediction of the vacuum energy from a quantum point of view. We argue that dark matter is an informational field with finite and quantifiable negative mass, distinct from the conventional fields of matter of quantum field theory and associated with the n

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Weinstock, Dan, and Joseph Appelbaum. "Optimal Solar Field Design of Stationary Collectors." Journal of Solar Energy Engineering 126, no. 3 (2004): 898–905. http://dx.doi.org/10.1115/1.1756137.

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The optimal design of stationary photovoltaic and thermal collectors in a solar field, taking into account shading and masking effects, may be based on several criteria: maximum incident energy on collector plane from a given field, minimum field area for given incident energy, minimum cost per unit energy, minimum plant cost, maximum energy per unit collector area or other objectives. These design problems may be formulated as optimization problems with objective functions and sets of constraints (equality and inequality) for which mathematical optimization techniques may be applied. This art

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Evdokimova, E. M. "EBRD ACTIVITIES IN THE FIELD OF SUSTAINABLE ENERGY." MGIMO Review of International Relations, no. 5(32) (October 28, 2013): 131–38. http://dx.doi.org/10.24833/2071-8160-2013-5-32-131-138.

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The article focuses on one of the strategic European Bank for Reconstruction and Development (EBRD) sector priorities – sustainable energy. A vast amount of initiatives aiming at efficient energy use have been launched since the late XX century. Among others a pivotal role play the EBRD programmes comprising investments and technical assistance. Within over 20 years of activity the EBRD has gained great experience carrying out projects in the field of energy efficiency and therefore Sustainable Energy Initiative (SEI) was launched in 2006. Sub-sector breakdown include cleaner energy production

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Li, Chaojie, Yanqin Mao, Xiaoyue Wang, Zhixing Zhan, and Liang Cai. "Numerical Simulation of Internal Flow Field in Turbo-Expander." Journal of Physics: Conference Series 2137, no. 1 (2021): 012073. http://dx.doi.org/10.1088/1742-6596/2137/1/012073.

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Abstract As everyone pays more attention to energy consumption, it is very meaningful to use natural gas pressure energy for power generation and turbo-expander is an important part of power generation devices. In this paper, the turbo-expander model for pressure energy generation is meshed and numerically simulated based on fluent, and the pressure distribution and velocity distribution in the turbo-expander are obtained. The volute profile is Archimedes spiral, and the impeller is modeled by cfturbo. The main conclusions are as follows: when the number of grids is more than 2.2 million, the

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Husain, A., S. A. Haider, and V. K. Singh. "A Study of One-dimensional Weak Shock Propagation Under the Action of Axial and Azimuthal Magnetic Field: An Analytical Approach." Engineering, Technology & Applied Science Research 12, no. 6 (2022): 9503–9. http://dx.doi.org/10.48084/etasr.5277.

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The present paper presents an analytical study of the one-dimensional weak shock wave problem in a perfect gas under the action of a generalized magnetic field subjected to weak shock jump conditions (R-H conditions). The magnetic field is considered axial and azimuthal in cylindrically symmetric configuration. By considering a straightforward analytical approach, an explicit solution exhibiting time-space dependency for gas-dynamical flow parameters and total energy (generated during the propagation of the weak shock from the center of the explosion) has been obtained under the significant in

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Kopyev, A. V., A. M. Kiselev, A. S. Il’yn, V. A. Sirota, and K. P. Zybin. "Non-Gaussian Generalization of the Kazantsev–Kraichnan Model for a Turbulent Dynamo." Astrophysical Journal 927, no. 2 (2022): 172. http://dx.doi.org/10.3847/1538-4357/ac47fd.

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Abstract We consider a natural generalization of the Kazantsev–Kraichnan model for a small-scale turbulent dynamo. This generalization takes into account the statistical time asymmetry of a turbulent flow and thus allows one to describe velocity fields with energy cascade. For three-dimensional velocity fields, a generalized Kazantsev equation is derived, and the evolution of the second-order magnetic field correlator is investigated for large but finite magnetic Prandtl numbers. It is shown that as Pr m → ∞, the growth increment tends to the limit known from the T-exponential (Lagrangian defo

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Amrit Pattnaik, Jeet, M. Bhuyan, R. N. Panda, and S. K. Patra. "Isotopic shift in magic nuclei within relativistic mean-field formalism." Physica Scripta 96, no. 12 (2021): 125319. http://dx.doi.org/10.1088/1402-4896/ac3a4d.

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Abstract The ground-state properties such as binding energy, root-mean-square radius, pairing energy, nucleons density distribution, symmetry energy, and single-particle energies are calculated for the isotopic chain of Ca, Sn, Pb, and Z = 120 nuclei. The recently developed G3 and IOPB-I forces along with the DD-ME1 and DD-ME2 sets are used in the analysis employing the relativistic mean-field approximation. To locate the magic numbers in the superheavy region and to explain the observed kink at neutron number N = 82 for Sn isotopes, a three-point formula is used to see the shift of the observ

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BROUT, R. "ENTANGLEMENT AND THERMODYNAMICS OF BLACK HOLE ENTROPY." International Journal of Modern Physics D 17, no. 13n14 (2008): 2549–53. http://dx.doi.org/10.1142/s0218271808014187.

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Using simple conditions drawn from the stability of the cosmos in terms of vacuum energy density, the cutoff momentum of entanglement is related to the Planckian mass. In so doing the black hole entropy is shown to be independent of the number of field species that contribute to vacuum fluctuations. And this is in spite of the fact that the number of field species is a linear multiplicand of the entanglement entropy when the latter is expressed in terms of the fundamental momentum cutoff of all fields.

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Nesterenko, Maksim, Oksana Kapustina, and Sergey Nikiforov. "Influence of development of raw hydrocarbon deposits on the geodynamic state and seismic regime of the Earth's crust in the Southern Urals." Russian Journal of Seismology 3, no. 3 (2021): 75–83. http://dx.doi.org/10.35540/2686-7907.2021.3.05.

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The article presents the results of the analysis of the impact of field development on the geody-namic state and seismic activity of the earth's crust of the Southern Urals, were compared in field development, anthropogenic changes in the bowels of district fields with the level of seismic ac-tivity, correlation between indicators of development of deposits and the parameters of the seis-mic activity of the earth's crust and the statistical analysis of the seismic regime of the area de-posits of hydrocarbon raw materials. Correlation analysis of field development indicators and seismic activit

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Niu 牛, Jing 菁., Kang 康. Jiao 焦, Peng 鹏. He 贺, and Tong-Jie 同杰 Zhang 张. "Reconstruction of the Dark Energy Scalar Field Potential by Gaussian Process." Astrophysical Journal 972, no. 1 (2024): 14. http://dx.doi.org/10.3847/1538-4357/ad5fef.

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Abstract Dark energy is believed to be responsible for the acceleration of the Universe. In this paper, we reconstruct the dark energy scalar field potential V(ϕ) using the Hubble parameter H(z) through Gaussian process analysis. Our goal is to investigate dark energy using various H(z) data sets and priors. We find that the selection of the prior and the H(z) data set significantly affects the reconstructed V(ϕ). We compare two models, Power Law and Free Field, to the reconstructed V(ϕ) by computing the reduced chi-square. The results suggest that the models are generally in agreement with th

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Anischenko, Galyna, and Denys Lavinskyi. "Non-stationary phenomena in technological systems of electromagnetic processing of materials." Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines, no. 2 (December 31, 2022): 39–42. http://dx.doi.org/10.20998/2078-9130.2022.2.270863.

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A large number of technical and technological facilities work under the action of electromagnetic fields. In electroconductive bodies have significant largest electromagnetic forces that can cause movement or deformation of structural elements. The creation of effective methods of analysis of the distribution of the electromagnetic field and coupled nonstationary deformation of structural elements is topical at present time. The article contains a mathematical formulation of the problem of nonstationary deformation of structural elements under the action of electromagnetic fields. Coupling of

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Hussin, Nur Hazwani. "Encryption Techniques and Wireless Power Transfer Schemes." Indonesian Journal of Electrical Engineering and Computer Science 9, no. 1 (2018): 183. http://dx.doi.org/10.11591/ijeecs.v9.i1.pp183-190.

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<p>Wireless power transfer (WPT) is one of the most useful ways to transfer power. Based on power transfer distances, the WPT system can be divided into three categories, namely, near, medium, and far fields. Inductive coupling and capacitive coupling contactless techniques are used in the near-field WPT. Magnetic resonant coupling technique is used in the medium-field WPT. Electromagnetic radiation is used in the far-field WPT. This paper reviews the techniques used in WPT. In addition, energy encryption plays a major role in ensuring that power is transferred to the true receiver. Ther

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Nur, Hazwani Hussin, M. Azizan M., Ali A., and A. M. Albreem M. "Encryption Techniques and Wireless Power Transfer Schemes." Indonesian Journal of Electrical Engineering and Computer Science 9, no. 1 (2018): 183–90. https://doi.org/10.11591/ijeecs.v9.i1.pp183-190.

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Wireless power transfer (WPT) is one of the most useful ways to transfer power. Based on power transfer distances, the WPT system can be divided into three categories, namely, near, medium, and far fields. Inductive coupling and capacitive coupling contactless techniques are used in the near-field WPT. Magnetic resonant coupling technique is used in the medium-field WPT. Electromagnetic radiation is used in the far-field WPT. This paper reviews the techniques used in WPT. In addition, energy encryption plays a major role in ensuring that power is transferred to the true receiver. Therefore, th

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Gu, Xiaoyu, Yaobin Ou, and Lu Yang. "Incompressible limit of isentropic magnetohydrodynamic equations with ill-prepared data in bounded domains." Journal of Mathematical Physics 64, no. 3 (2023): 031501. http://dx.doi.org/10.1063/5.0140349.

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This paper rigorously justifies the incompressible limit of strong solutions to isentropic compressible magnetohydrodynamic equations with ill-prepared initial data in a three-dimensional bounded domain as the Mach number goes to zero. In both cases of viscous and inviscid magnetic fields, we establish a new energy functional with weight to obtain uniform estimates for strong solutions with respect to the Mach number. Then, we prove the weak convergence of a velocity and the strong convergence of a magnetic field and the divergence-free component of a velocity field, which yields the correspon

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Wu, Bowei, Pengfei Kang, Tingfeng Ma, et al. "Energy-Trapping Characteristics of Lateral Field Excited GdCOB Crystal Bulk Acoustic Wave Devices Based on Stepped Electrodes." Micromachines 14, no. 12 (2023): 2162. http://dx.doi.org/10.3390/mi14122162.

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In this work, high-frequency forced vibrations of lateral field excitation (LFE) devices with stepped electrodes based on monoclinic crystals GdCOB are modeled, and the influence laws of the device parameters (the step number, size, and thickness of the stepped electrodes) on the energy-trapping effects of the device are revealed. The results show that the step number has a significant effect on the energy-trapping effect of the device: with the increase in the step number, the stronger energy-trapping effect of the device can be obtained; with the increase in the thickness difference of two l

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HALL, LAWRENCE J. "ALTERNATIVE LOW ENERGY SUPERSYMMETRY." Modern Physics Letters A 05, no. 07 (1990): 467–72. http://dx.doi.org/10.1142/s0217732390000536.

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Models of low energy supersymmetry require some additional symmetry beyond the known gauge symmetries. The usual preference for R parity, which leads to the standard low energy supersymmetry model, has no clear theoretical motivation. The alternative models with minimal field content are reviewed. In one case R parity is spontaneously broken by a large sneutrino vev. In three other cases R parity is replaced by an alternative symmetry; baryon number, lepton number or ZN.

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Balitsky, Ja V., and V. V. Kiselev. "Quantum origin of suppression for vacuum fluctuations." International Journal of Modern Physics: Conference Series 41 (January 2016): 1660135. http://dx.doi.org/10.1142/s2010194516601356.

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By example of a model with a spatially global scalar field, we show that the energy density of zero-point modes is exponentially suppressed by an average number of field quanta in a finite volume with respect to the energy density in the stationary state of minimal energy. We describe cosmological implications of mechanism.

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Kemeç, Abidin, and Ayşenur Tarakcıoglu Altınay. "Sustainable Energy Research Trend: A Bibliometric Analysis Using VOSviewer, RStudio Bibliometrix, and CiteSpace Software Tools." Sustainability 15, no. 4 (2023): 3618. http://dx.doi.org/10.3390/su15043618.

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Purpose: To systematically present the publication trends related to sustainable energy, which is an interdisciplinary concept. Design/methodology/approach: This study performed bibliometric analysis to investigate sustainable energy research between 1980 and 2022 using a sample of 1498 research papers from the Web of Science (WoS) databases, with only published articles on sustainable energy. Findings: A bibliometric analysis reveals trends in sustainable energy research publications, showing sustainable energy as an emerging topic and trends in sustainability and energy research. However, it

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