Готові списки джерел за темами / Phase co-ordinates

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Добірка наукової літератури з теми "Phase co-ordinates"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Phase co-ordinates"

Saleh, A. O. M., M. A. Laughton, and G. T. Stone. "M - to N-phase transformer models in phase co-ordinates." IEE Proceedings C Generation, Transmission and Distribution 132, no. 1 (1985): 41. http://dx.doi.org/10.1049/ip-c.1985.0009.

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CHAKRABARTI, B., T. L. REMA DEVI, and A. BHATTACHARYA. "A STUDY OF QUARK-HADRON PHASE TRANSITION." International Journal of Modern Physics A 10, no. 29 (November 20, 1995): 4179–85. http://dx.doi.org/10.1142/s0217751x95001935.

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The anomalous behavior of the thermodynamic co-ordinates along with the hadronic critical temperature (Tc) is studied and the properties of the surrounding vacuum are investigated in the framework of the Ginzburg-Landau theory of superconductivity, with interesting conclusions.

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Roberts, Dana Aaron, and Barbara Abraham-Shrauner. "Particle paths and phase plane for time-dependent similarity solutions of the one-dimensional Vlasov-Maxwell equations." Journal of Plasma Physics 38, no. 3 (December 1987): 335–50. http://dx.doi.org/10.1017/s0022377800012642.

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Lie group point transformations applied to the one-dimensional Vlasov– Maxwell equations yield general similarity forms for the dependent and independent variables. One class of such solutions is seemingly like Bern-stein-Greene-Kruskal solutions in allowing a relatively free choice of electric field, but with a more complex time dependence. The phase trajectories of the particles are found here for both temporally damped and (possibly unphysical) growing electric fields in this class by numerical integration in the original and in transformed co-ordinates. The analysis, which includes an analytic consideration of phase-plane fixed (critical) points, shows the advantages of the new co-ordinates, and reveals qualitative features of the distribution function.

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Jung, Y. G., Y. C. Lim, and S. R. Yang. "Single-phase active power filter based on three-dimensional current co-ordinates." IEE Proceedings - Electric Power Applications 147, no. 6 (2000): 572. http://dx.doi.org/10.1049/ip-epa:20000720.

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El-Mansy, Ibraheem. "The Analysis of Sequential ground Faults on a Six Phase Generator in Phase Co-ordinates.(Dept.E)." MEJ. Mansoura Engineering Journal 21, no. 2 (February 25, 1996): 1–15. http://dx.doi.org/10.21608/bfemu.1996.151888.

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Leslie, C. E., J. R. Fryer, C. J. Gilmore, and W. Nicolson. "Use of direct phasing in determination of atomic co-ordinates of anthanthrene, C22H12." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 154–55. http://dx.doi.org/10.1017/s0424820100137148.

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Imaging of organic crystals in the electron microscope is limited by their sensitivity to the electron beam, with even the most stable molecules only giving a resolution of ~3Å. By contrast, electron diffraction requires a lower beam intensity, and so can give much better resolution, down to ~lÅ under favourable conditions. Intensities may be measured directly from the diffraction pattern, and the phase determination problem can be surmounted by applying the maximum entropy method, which chooses phases by likelihood estimation.It was decided to apply this method to the organic molecule anthanthrene, C22H12 (fig. 1), since x-ray studies found that the crystals were monoclinic with a = 12.10Å, b = 10.34Å, c = 10.74Å, β = 92.2°, space group P21/a and Z = 4, but no details of the atomic co-ordinates were given in the literature. A previous study of the molecule, using KC1 as the substrate, produced epitaxial layers showing the acprojection being most common at room temperature.

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YANG, BENHUI, and BILL POIRIER. "ROVIBRATIONAL BOUND STATES OF THE Ar2Ne COMPLEX." Journal of Theoretical and Computational Chemistry 12, no. 01 (February 2013): 1250107. http://dx.doi.org/10.1142/s0219633612501076.

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We report exact quantum dynamics calculations of the eigenstate energy levels for the bound rovibrational states of the Ar2Ne complex, across the range of J values for which such states are observed (J = 0–35). All calculations have been carried out using the ScalIT suite of parallel codes. These codes employ a combination of highly efficient methods, including phase-space optimized discrete variable representation, optimal separable basis, and preconditioned inexact spectral transform (PIST) methods, together with an effective massive parallelization scheme. The Ar2Ne energy levels were computed using a pair-wise Aziz potential plus a three-body correction, in Jacobi co-ordinates. Effective potentials for the radial co-ordinates are constructed, which reveal important physical insight into the two distinct dissociation pathways, Ar2Ne → NeAr + Ar and Ar2Ne → Ar2 + Ne . A calculation of the bound vibrational (J = 0) levels, computed using the Tang–Toennies potential, is also performed for comparison with results from the previous literature.

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Angeles-Camacho, C., and E. Acha. "Phase-domain power flows in the rectangular co-ordinates frame of reference including VSC-based FACTS controllers." Electric Power Systems Research 78, no. 3 (March 2008): 494–506. http://dx.doi.org/10.1016/j.epsr.2007.04.004.

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Ishov, Alexander M., Aishwarya Gurumurthy, and Jörg Bungert. "Coordination of transcription, processing, and export of highly expressed RNAs by distinct biomolecular condensates." Emerging Topics in Life Sciences 4, no. 3 (April 27, 2020): 281–91. http://dx.doi.org/10.1042/etls20190160.

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Genes under control of super-enhancers are expressed at extremely high levels and are frequently associated with nuclear speckles. Recent data suggest that the high concentration of unphosphorylated RNA polymerase II (Pol II) and Mediator recruited to super-enhancers create phase-separated condensates. Transcription initiates within or at the surface of these phase-separated droplets and the phosphorylation of Pol II, associated with transcription initiation and elongation, dissociates Pol II from these domains leading to engagement with nuclear speckles, which are enriched with RNA processing factors. The transitioning of Pol II from transcription initiation domains to RNA processing domains effectively co-ordinates transcription and processing of highly expressed RNAs which are then rapidly exported into the cytoplasm.

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Schorderet, Alain, and Thomas Gmu¨r. "Structural Dynamics Optimization Based on a Hybrid Inverse Synthesis Method Using a Quadratic Approximation." Journal of Vibration and Acoustics 126, no. 2 (April 1, 2004): 253–59. http://dx.doi.org/10.1115/1.1688759.

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This paper lies within the framework of the so-called redesign problem of structures subjected to dynamic constraints. A hybrid synthesis algorithm is developed, combining the truncated modal basis of the initial system and the spatial or material co-ordinates of an added component, which is modelled with shell-type finite elements parameterized with respect to a shape factor. Based upon a quadratic inverse formulation, the proposed technique shows several advantages in comparison to other synthesis methods, such as a refined sensitivity strategy, a powerful modal synthesis approach and a simplified optimization phase. Numerical examples are provided illustrating the capabilities of the novel procedure.

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Більше джерел

Дисертації з теми "Phase co-ordinates"

Вепрік, Юрій Миколайович. "Розвиток теорії і методів математичного моделювання режимів роботи електричних систем з несиметрією". Thesis, Донецький національний технічний університет, 2010. http://repository.kpi.kharkov.ua/handle/KhPI-Press/33250.

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Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.14.02 – Електричні станції, мережі та системи. – ДВНЗ «Донецький національний технічний університет», Донецьк, 2010. Дисертація присвячена вирішенню важливої науково-технічної проблеми – розробці теоретичних основ, методів і засобів математичного моделювання електричних систем з простою і складною несиметрією в стаціонарних і перехідних режимах, що орієнтовані на сучасний рівень розвитку засобів обчислювальної техніки і забезпечують підвищення ефективності процесів як моделювання, так і розробки моделей таких систем. У роботі сформульовано і реалізовано узагальнений, системний підхід до завдань математичного моделювання стаціонарних і перехідних режимів електричних систем з несиметрією на основі узагальнених, багатофункціональних математичних моделей і макромоделювання у фазних координатах, розроблені і практично реалізовані методи, моделі і засоби, що дозволяють ставити і вирішувати широке коло завдань, які в рамках моделей, традиційно орієнтованих на спрощення завдання шляхом заміни реальних трифазних систем однофазними еквівалентами, не вирішуються або вирішуються лише приблизно. Розроблено базові математичні моделі, що дозволяють досліджувати стаціонарні режими, електромагнітні та електромеханічні перехідні процеси електричних систем довільного складу і структури з несиметрією будь-якого вигляду з урахуванням всіх основних впливаючих чинників. Основні наукові і практичні результати роботи широко упроваджені у виробництво.
Dissertation for getting of the scientific degree of doctor of technical sciences on speciality 05.14.02 “Electrical stations, nets and systems. Donetck National Technical Universiti, Donetsk, 2010. Dissertation is devoted the decision of important scientific and technical problem – development of theoretical bases, methods and facilities of mathematical design of the electric systems with stand and by difficult unsymmetry in the stationary and transitional modes, oriented to the modern level of development of facilities of the computing engineering and providing the increase of efficiency of processes of both design and development of models of such systems. In-process formulated and realized the generalized, system going near the tasks of mathematical design of the stationary and transitional modes of the electric systems with unsymmetry on the basis of the generalized, multifunction mathematical models and macromodeling in phase coordinates, developed and methods, models and facilities, allowing to put and decide the wide circle of tasks, which within the framework of models, traditionally orientable on simplification of task substitutionally by monophase equivalents the real three-phase systems, do not decide or decide only approximately, are practically realized. Base mathematical models, allowing to probe the stationary modes, are developed, electromagnetic and electromechanics transients of the electric systems of arbitrary composition and structure with unsymmetry of any kind taking into account all of basic influences. Basic scientific and practical job performances are widely applied in industry.

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Тези доповідей конференцій з теми "Phase co-ordinates"

Tabatabaee, Mohammad Hadi, and Bahram Ravani. "A Non-Iterative Carrier Phase Differential GNSS Kinematic Localization Method." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-68209.

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Reliable and accurate kinematic localization is becoming more important in autonomous vehicles and advanced driver assistance systems (ADAS) which need to precisely locate vehicles on roadways. Code-base undifferenced GNSS receivers provide rough position estimates with errors too large to be practical for such applications. Carrier-phase observations are able to provide sub-meter accuracies and have been receiving much attention in recent years. Iterative methods are commonly used for solving the double-difference equations and find the receiver co-ordinates. This paper presents a non-iterative method for solving double-differenced carrier phase observation equations and evaluates its effectiveness for kinematic localization for vehicle positioning.

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Laumert, Bjo¨rn, Hans Ma˚rtensson, and Torsten H. Fransson. "Simulation of Rotor/Stator Interaction With a 4D Finite Volume Method." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30601.

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A finite volume method for the computation of rotor/stator interaction for stages with arbitrary rotor/stator pitch ratios is presented and partly validated in this paper. The method which solves the unsteady three-dimensional Euler equations is formulated in the four-dimensional time-space domain. The method of time inclination is utilized to account for unequal pitchwise periodicity by distributing time co-ordinates at the grid nodes such that phase lagged boundary conditions can be employed. Calculated results show excellent agreement with the results of a reference solver for the validation test case. Furthermore the method was applied to the simulation of the unsteady flow field in a transonic test turbine stage with a stator/rotor pitch ratio of 1.875. The results were compared with measurements of the unsteady rotor blade pressure and a reference solver calculation where an approximate pitch ratio of 2.0 with a 6.7% scaled rotor geometry was employed. Both computational cases show satisfactory agreement with the experiments for both time averaged pressure distributions and pressure perturbation amplitudes.

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Zhang, Cheng, Kiel Schultheiss, Aniruddha Mitra, and Mosfequr Rahman. "Parametric Studies of Coal Gasification in an Entrained-Flow Gasifier." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51966.

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Although alternative energy sources, such as nuclear, wind, and solar, are showing great potential, hydrocarbon fuels are expected to continue to play an important role in the near future. There is an increasing interest in developing technologies to use hydrocarbon fuels cleanly and efficiently. The gasification technology that converts hydrocarbon fuels into syngas is one of these promising technologies. Entrained-flow gasifiers are the preferred gasifier design for future deployment due to their high carbon conversion, high efficiency and high syngas purity. Current designs of entrained-flow gasifiers still have serious problems such as injector failure, refractory failure, slag blockages, downstream fouling and poisoning, poor space efficiency, and lack of dynamic feedstock flexibility. To better understand the entrained-flow gasification process, we performed parametric studies of coal gasification in the laboratory-scale gasifier developed at Brigham Young University (BYU) using ANSYS FLUENT. An Eulerian approach was used to describe the gas phase, and a Lagrangian approach was used to describe the particle phase. The interactions between the gas phase and particle phase was modeled using the particle-source-in-cell approach. Turbulence was modeled using the standard k-ε model. Turbulent particle dispersion was taken into account by using the discrete random walk model. Devolatilization was modeled using a version of the chemical percolation devolatilization (CPD) model, and char consumption was described with a shrinking core model. Turbulent combustion in the gas phase was modeled using a finite-rate/eddy-dissipation model. Radiation was considered by solving the radiative transport equation with the discrete ordinates model. Second-order upwind scheme was used to solve all gas phase equations. First, the numerical model was validated by using experimental data for the mole fractions of the major species (CO, CO2, H2, and H2O) along the gasifier centerline. Then, the effects of concentrations of steam and oxygen at the inlets, and steam preheat temperature were studied. Model predictions found that increasing the steam concentration or steam preheat temperature in the secondary inlet generally decreases CO concentration, while increasing CO2 and H2 concentrations. Increasing the steam concentration in the secondary inlet showed no significant effects on predicted gas temperature in the gasifier. Increasing the oxygen concentration in the primary inlet generally increases gas temperature, CO and CO2 concentrations, while decreasing H2 concentration.

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Liu, Fengshan, Francesca Migliorini, Francesco Cignoli, Silvana De Iuliis, and Giorgio Zizak. "Effects of Hydrogen and Helium Addition to Fuel on Soot Formation in Axisymmetric Coflow Laminar Methane-Air Diffusion Flame." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32466.

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Numerical and experimental studies were conducted to investigate the effects of hydrogen and helium addition to fuel on soot formation in atmospheric axisymmetric coflow laminar methane-air diffusion flame. Soot temperature and volume fraction distributions were measured using a two-dimensional two-color technique. Numerically the conservation equations of mass, momentum, energy, and species in the limit of low-Mach number were solved. Detailed gas-phase chemistry and thermal and transport properties were accounted for. Radiative heat transfer by CO, CO2, H2O, and soot was calculated using the discrete-ordinates method with the radiative properties of the mixture obtained from a wide-band model. Soot was modeled using a two-equation semi-empirical model in which the mechanisms for inception and surface growth are assumed to be PAH coagulation and H-abstraction acetylene addition. Both experimental and numerical results show that helium addition is more efficient than hydrogen addition in reducing soot formation in the methane flame. These results are different from the previous investigations in ethylene flames where the hydrogen addition was found to be more effective in reducing soot formation than helium addition due to the additional chemical suppression of hydrogen on soot. It is suggested here that hydrogen chemically enhances soot formation when added to methane.

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Zhang, Cheng. "Numerical Modeling of Coal Gasification in an Entrained-Flow Gasifier." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88481.

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The gasification technology has been applied in Integrated Gasification Combined Cycle (IGCC) plants for the production of power, and polygeneration plants for the production of industrial chemicals, fuels, hydrogen, and power. The major advantages of the gasification technology are its potential for feed-stock flexibility, product flexibility, and relative simple removal of harmful emissions of nitrogen oxides (NOx), sulfur oxides (SOx), and CO2. Entrained-flow gasifiers are the preferred gasifier design for future deployment due to their high carbon conversion, high efficiency and high syngas purity. Current entrained-flow gasifier designs still have serious problems such as injector failure, refractory failure, slag blockages, downstream fouling and poisoning, poor space efficiency, and lack of dynamic feedstock flexibility. To better understand the entrained-flow gasification process, we performed steady Reynolds-averaged Navier-Stokes (RANS) modeling of the laboratory-scale gasifier developed at Brigham Young University (BYU) using ANSYS Fluent. An Eulerian approach is used to describe the gas phase, and a Lagrangian approach is used to describe the particle phase. The interactions between the gas phase and particle phase is modeled using the particle-source-in-cell approach. Turbulence is modeled using the shear-stress transport (SST) k–ω model. Turbulent particle dispersion is taken into account by using the discrete random walk model. Devolatilization is modeled using a version of the chemical percolation devolatilization (CPD) model, and char consumption is described with a shrinking core model. Turbulent combustion in the gas phase is modeled using a finite-rate/eddy-dissipation model. Radiation is considered by solving the radiative transport equation with the discrete ordinates model. Second-order upwind scheme is used to solve all gas phase equations. First, to validate the flow solver, we performed numerical modeling of a non-reacting particle-laden bluff-body flow. For the non-reacting flow, the predicted mean velocities of the gas phase and the particle phase are in good agreement with the experimental data. Next, we performed numerical modeling of the gasification process in the BYU gasifier. The predicted profiles of the mole fractions of the major species (i.e. CO, CO2, H2, and H2O) along the centerline are in reasonable agreement with the experimental data. The predicted carbon conversion at the gasifier exit agrees with the experimental data. The predicted temperature at the gasifier exit agrees with the estimated value based on water-gas shift equilibrium considerations. The numerical model was further applied to study the effects of the equivalence ratio, particle size, and swirl on the gasification process.

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Costantini, Aldo, Gioia Falcone, Geoffrey F. Hewitt, and Claudio Alimonti. "Using Transient Inflow Performance Relationships to Model the Dynamic Interaction Between Reservoir and Wellbore During Pressure Testing." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29524.

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The fundamental understanding of the dynamic interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these interactions is via inflow performance relationships (IPR’s), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behaviour in the well. Steady-state IPR’s are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. Transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at surface and the bottomhole pressure is measured. Pressure build-up (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g. phase change, flow reversal and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artefacts. This paper introduces a method to derive the transient IPR’s at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial co-ordinates, homogeneous rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental set-up was carried out. The set-up would allow the investigation of the dynamic interaction between the reservoir, the near-wellbore region and the well, represented by a pressured vessel, a cylindrical porous medium and a vertical pipe, respectively.

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