Journal articles: 'Physics Hydrostatics'

1

Duffy, Brian R. "A bifurcation problem in hydrostatics." American Journal of Physics 61, no. 3 (March 1993): 264–69. http://dx.doi.org/10.1119/1.17302.

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Miranda, E. N. "An apparent paradox in hydrostatics." European Journal of Physics 30, no. 4 (May 8, 2009): L55—L57. http://dx.doi.org/10.1088/0143-0807/30/4/l03.

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Miranda, E. N. "An apparent paradox in hydrostatics." European Journal of Physics 31, no. 1 (December 23, 2009): 249. http://dx.doi.org/10.1088/0143-0807/31/1/c01.

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Casey, James. "Clairaut’s hydrostatics: A study in contrast." American Journal of Physics 60, no. 6 (June 1992): 549–54. http://dx.doi.org/10.1119/1.16873.

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Gnyawali, Vaskar, Mohammadali Saremi, Michael C. Kolios, and Scott S. H. Tsai. "Stable microfluidic flow focusing using hydrostatics." Biomicrofluidics 11, no. 3 (May 2017): 034104. http://dx.doi.org/10.1063/1.4983147.

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Omidvar, Pourya, Omid Farghadani, and Pooyan Nikeghbali. "SPH for impact force and ricochet behavior of water-entry bodies." International Journal of Modern Physics C 28, no. 10 (October 2017): 1750119. http://dx.doi.org/10.1142/s0129183117501194.

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The numerical modeling of fluid interaction with a bouncing body has many applications in scientific and engineering application. In this paper, the problem of water impact of a body on free-surface is investigated, where the fixed ghost boundary condition is added to the open source code SPHysics2D1 to rectify the oscillations in pressure distributions with the repulsive boundary condition. First, after introducing the methodology of SPH and the option of boundary conditions, the still water problem is simulated using two types of boundary conditions. It is shown that the fixed ghost boundary condition gives a better result for a hydrostatics pressure. Then, the dam-break problem, which is a bench mark test case in SPH, is simulated and compared with available data. In order to show the behavior of the hydrostatics forces on bodies, a fix/floating cylinder is placed on free surface looking carefully at the force and heaving profile. Finally, the impact of a body on free-surface is successfully simulated for different impact angles and velocities.

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Meerson, Baruch, Manuel Díez-Minguito, Thomas Schwager, and Thorsten Pöschel. "Close-packed granular clusters: hydrostatics and persistent Gaussian fluctuations." Granular Matter 10, no. 1 (August 21, 2007): 21–27. http://dx.doi.org/10.1007/s10035-007-0055-1.

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Salvia, Stefano. "From Archimedean Hydrostatics to Post-Aristotelian Mechanics: Galileo’s Early Manuscripts De motu antiquiora (ca. 1590)." Physics in Perspective 19, no. 2 (May 30, 2017): 105–50. http://dx.doi.org/10.1007/s00016-017-0202-y.

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Zhang, Fei, and Xinping Zhou. "Hydrostatics and stability of a floating elliptical cylinder with surface tension effects for different eccentricities and Bond numbers." Journal of Physics: Conference Series 1141 (December 2018): 012002. http://dx.doi.org/10.1088/1742-6596/1141/1/012002.

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Spyropoulos, A. N., A. G. Papathanasiou, and A. G. Boudouvis. "The 2-3-4 spike competition in the Rosensweig instability." Journal of Fluid Mechanics 870 (May 10, 2019): 389–404. http://dx.doi.org/10.1017/jfm.2019.277.

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The horizontal free surface of a magnetic liquid (ferrofluid) pool turns unstable when the strength of a vertically applied uniform magnetic field exceeds a threshold. The instability, known as normal field instability or Rosensweig’s instability, is accompanied by the formation of liquid spikes either few, in small diameter pools, or many, in large diameter pools; in the latter case, the spikes are arranged in hexagonal or square patterns. In small pools where only few spikes – 2, 3 or 4 in this work – can be accommodated, their appearance/disappearance/re-appearance observed in experiments, as applied field strength varies, is investigated by computer-aided bifurcation and linear stability analysis. The equations of three-dimensional capillary magneto-hydrostatics give rise to a three-dimensional free boundary problem which is discretized by the Galerkin/finite element method and solved for multi-spike surface deformation coupled with magnetic field distribution simultaneously with a compact numerical scheme based on Newton iteration. Standard eigenvalue problems are solved in the course of parameter continuation to reveal the multiplicity and the stability of the emerging deformations. The computational predictions reveal selection mechanisms among equilibrium states and explain the corresponding experimental observations and measurements.

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Pryshlyak, Viktor, and Viktor Dubchak. "FINDING THE SIZE OF PRESSURE FORCE ON UNDERWATER HYDRAULIC STRUCTURES IN DESIGN AND AGRICULTURAL TRAINING OF SPECIALISTS." ENGINEERING, ENERGY, TRANSPORT AIC, no. 1(108) (August 27, 2020): 111–22. http://dx.doi.org/10.37128/2520-6168-2020-1-13.

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The article presents the results of scientific analytical studies that provide finding the pressure force on underwater hydraulic structures, such as, dams of hydroelectric power stations, sedimentation tanks for liquid organic fertilizers, sewage, coastal fortifications of lakes, rivers, ponds, etc. Practical experience in industrial and pedagogical activity and the analysis of inventive and scientific research of domestic as well as foreign scientists showed that constructive, technological and economic feasibility, operational safety of underwater hydraulic structures requires further analytical and calculation studies based on mathematical optimization methods. Of particular great scientific interest are the achievements of Chinese scientists. Their achievements from the calculation, design, construction and operation of hydraulic structures of small and large hydroelectric power stations are recognized by scientists, designers and manufacturers in the world. The work is based on research aimed at the mathematical justification of the parameters of a rectangular and trapezoidal airlock and a circular hatch, which is located at an arbitrary, optimally justified depth. It was taken into account that new students are enrolled in universities annually for training, they need to obtain knowledge based on the strength of the structures of objects with the use of innovative techniques based on the fundamental mathematical apparatus. The formation of professional competencies of agricultural engineers should ensure the ability to apply in their work the theoretical foundations and basic methods of physics and mathematics, hydrostatics, dynamics, fluid mechanics for the calculation and design of technical objects, and, of course, underwater hydraulic structures. Agroengineers should be able to perform strength calculations on the walls of tanks of any geometric profiles for storing liquids, as well as side walls and bottoms of hydraulic structures, bodies located in liquids.

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Song, Yu, and S. R. Habibi. "Electro-Hydrostatic Actuator Modeling." Applied Mechanics and Materials 307 (February 2013): 131–35. http://dx.doi.org/10.4028/www.scientific.net/amm.307.131.

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This paper demonstrates the modeling of an Electro-Hydrostatic Actuator prototype. The mathematical derivation of the physical model is reported.Parametric model was obtained through system identification.

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Saunders, W. Bruce, and Earl A. Shapiro. "Calculation and simulation of ammonoid hydrostatics." Paleobiology 12, no. 1 (1986): 64–79. http://dx.doi.org/10.1017/s0094837300002980.

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The buoyancy, stability, and orientation of a shelled cephalopod in water are the predictable products of shell geometry, body chamber length, and such physical parameters as shell, tissue, and water densities. Given such physical characteristics as shell geometry, shell, tissue, and water densities, and shell thickness, the hydrostatic characteristics of planispiral shelled cephalopods, including orientation, centers of mass and buoyancy, stability, and neutrally buoyant body chamber length, can be calculated and simulated using microcomputer-based techniques. Individual variables such as geometry, body chamber length, and shell thickness are linked in a calculable manner to orientation, neutral buoyancy, and stability. Living Nautilus provides a means of testing the model and for making hydrostatic comparisons between ammonoids and nautiloids. The close agreement between calculated versus observed body chamber lengths in five species of Mississippian ammonoids shows that neutral buoyancy, and (with one exception) Nautilus-like orientations, were at least feasible for these species.

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Zong, Bao Chun, and Chuan Hui Nie. "Measuring the Gravitational Acceleration by Hydrostatics." Applied Mechanics and Materials 307 (February 2013): 271–74. http://dx.doi.org/10.4028/www.scientific.net/amm.307.271.

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According to the physical principles of hydrostatics, we measure the gravitational acceleration by using the air specific heat ratio comprehensive instrument and an inverted test tube with a pressure sensor at the bottom of it. The experiment is simple and does not involve the measurement of time. The result is good.

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Guedda, H. Z., T. Ouahrani, A. Morales-García, R. Franco, M. A. Salvadó, P. Pertierra, and J. M. Recio. "Computer simulations of 3C-SiC under hydrostatic and non-hydrostatic stresses." Physical Chemistry Chemical Physics 18, no. 11 (2016): 8132–39. http://dx.doi.org/10.1039/c6cp00081a.

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GOVENDER, M., K. P. REDDY, and S. D. MAHARAJ. "THE ROLE OF SHEAR IN DISSIPATIVE GRAVITATIONAL COLLAPSE." International Journal of Modern Physics D 23, no. 02 (January 29, 2014): 1450013. http://dx.doi.org/10.1142/s0218271814500138.

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In this paper, we investigate the physics of a radiating star undergoing dissipative collapse in the form of a radial heat flux. Our treatment clearly demonstrates how the presence of shear affects the collapse process; we are in a position to contrast the physical features of the collapsing sphere in the presence of shear with the shear-free case. By employing a causal heat transport equation of the Maxwell–Cattaneo form we show that the shear leads to an enhancement of the core temperature thus emphasizing that relaxational effects cannot be ignored when the star leaves hydrostatic equilibrium.

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Tang, Jun, Xiao Diao Huang, and Cheng Gang Fang. "BP Neural Network in Prediction of the Constant-Current Hydrostatic Bearing Static Stiffness." Advanced Materials Research 199-200 (February 2011): 271–74. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.271.

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SKZT3500 NC rotary table adopts constant-current hydrostatic bearing and unloading guide two sets of hydraulic system. Aiming at the characteristics of two sets of hydraulic system, this paper deduces the constant-current hydrostatic bearing static stiffness formula. Then, the theory and algorithm of BP neural network were applied to predict the constant-current hydrostatic bearing static stiffness, based on experimental measurements in a physical prototype and neural network toolbox of MATLAB. Testing results show that BP neural network can accurately forecast the constant-current hydrostatic bearing of the static stiffness.

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18

Kernell, R. L. "Simplified hydrostatic paradox." American Journal of Physics 53, no. 11 (November 1985): 1106. http://dx.doi.org/10.1119/1.14046.

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Zhuang, Yukai, Lidong Dai, Heping Li, Haiying Hu, Kaixiang Liu, Linfei Yang, Chang Pu, and Meiling Hong. "Pressure-induced reversible metallization and phase transition in Zinc Telluride." Modern Physics Letters B 32, no. 28 (October 4, 2018): 1850342. http://dx.doi.org/10.1142/s0217984918503426.

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The crystalline and electronic structural properties of Zinc Telluride (ZnTe) are investigated systematically up to [Formula: see text]25 GPa using a diamond anvil cell (DAC) in conjunction with a series of advanced optical and electrical testing methods at both non-hydrostatic and hydrostatic conditions. Based on Raman spectroscopy and AC impedance spectroscopy, ZnTe undergoes two phase transitions from initial zinc-blende phase to cinnabar phase at 7–9 GPa, then it transforms to Cmcm phase at 11–13 GPa under the non-hydrostatic condition. Meantime, the semiconductor to metal phase transition is verified by the temperature-dependent conductivity measurements. In these studies, the pressure points of phase transition and metallization of ZnTe are approximately same under the hydrostatic condition. The feeble influence of non-hydrostatic and hydrostatic conditions on the phase transition and metallization of ZnTe can be reasonably explained by its own crystalline structure from atomic force microscopy and high-resolution transmission electron microscopy.

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Inogamov, N. A. "Many-dimensional periodicity and turbulence of Rayleigh–Taylor and Richtmyer–Meshkov instabilities." Laser and Particle Beams 15, no. 1 (March 1997): 53–64. http://dx.doi.org/10.1017/s0263034600010740.

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The work begins with a presentation of results concerning periodic Rayleigh-Taylor (RT)and Richtmyer–Meshkov (RM) dynamics. The periodic RT flows are considered in 2D and 3D cases. The periodic RM flows are considered in a 2D case. Nonstationary and steadystate statements of RT and RM problems are given. Nonstationary statements of RT and RM problems are given in the2D case. Steady-state statements of RT and RM problems are considered in the 2D and 3D cases (RT) and in the 2D case (RM). Questions about turbulence are given in the second part of the work. In the nonstationary statement, the beginning of a transition from an equilibrium close to hydrostatics and behavior of a dynamic system when it is close to the steady-state solution are considered. To study the smooth evolution of the dynamic system in the RT case (at last during an initial of order of unity t ≃ 1 stage) we have to cut of f an inverse turbulent cascade incoming from the small scales (inverse means that the typical k decreases in time during the cascade). The cascade starts from some small scale k ≫ 1 (here g = 1) and appears in the scales k ≃ 1 after time t ≃ 1 after start. We have to consider exponentially smoothed initial data to cut it off. This means that amplitudes of initial spectrum of perturbations have to be exponentially decreased in the direction of high k. The steadystates have been studied in two ways. In both of them the spectral decomposition of a velocity field and an elevation of the contact surface has been used. In one of them, corresponding to the nonstationary situation, the ordinary differential system for time dependent spectral components has been integrated. The other solutions of the algebraic equations for constant components have been studied. These results have been compared with a computer simulation that has been done by large particles and artificial compressibility methods. High-order nonlinear terms corresponding to the interaction of a wide spectrum of harmonics are considered in both ways. The spatial structure of the many dimensional periodic solutions is studied. It is known that there are two important features in the flows under consideration: the bubble envelope and the jet “phase.” Spatial structures of the 2D and 3D flows are compared in the report. It is shown that the apices of the bubbles are isolated points and the bubble envelopes in both flows are qualitatively similar; the difference has a quantitative character. On the contrary, the jet “phases” differ qualitatively in the 2D and 3D cases. In the 2D case in the plane picture, the jets are separated from each other. In this picture they are isolated fingers. In the 3D case, near the bubble envelope after some time of development following after cos kx cos qy type initial perturbation, they are not the isolated fingers. They form a structure of the intersecting walls. We see, thus, that the 2D and 3D cases are topologically different. Most powerful ejections of dense fluid are in the points where these wall jets intersect each other.

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Zhao, Chun, Mingyue Xu, Yu Wang, Meixin Zhang, Jianping Guo, Zhiyuan Hu, L. Ruby Leung, Michael Duda, and William Skamarock. "Modeling extreme precipitation over East China with a global variable-resolution modeling framework (MPASv5.2): impacts of resolution and physics." Geoscientific Model Development 12, no. 7 (July 8, 2019): 2707–26. http://dx.doi.org/10.5194/gmd-12-2707-2019.

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Abstract. The non-hydrostatic atmospheric Model for Prediction Across Scales (MPAS-A), a global variable-resolution modeling framework, is applied at a range of resolutions from hydrostatic (60, 30, 16 km) to non-hydrostatic (4 km) scales using regional refinement over East Asia to simulate an extreme precipitation event. The event is triggered by a typical wind shear in the lower layer of the Meiyu front in East China on 25–27 June 2012 during the East Asian summer monsoon season. The simulations are evaluated using ground observations and reanalysis data. The simulated distribution and intensity of precipitation are analyzed to investigate the sensitivity to model configuration, resolution, and physics parameterizations. In general, simulations using global uniform-resolution and variable-resolution meshes share similar characteristics of precipitation and wind in the refined region with comparable horizontal resolution. Further experiments at multiple resolutions reveal the significant impacts of horizontal resolution on simulating the distribution and intensity of precipitation and updrafts. More specifically, simulations at coarser resolutions shift the zonal distribution of the rain belt and produce weaker heavy precipitation centers that are misplaced relative to the observed locations. In comparison, simulations employing 4 km cell spacing produce more realistic features of precipitation and wind. The difference among experiments in modeling rain belt features is mainly due to the difference in simulated wind shear formation and evolution during this event. Sensitivity experiments show that cloud microphysics have significant effects on modeling precipitation at non-hydrostatic scales, but their impacts are relatively small compared to that of convective parameterizations for simulations at hydrostatic scales. This study provides the first evidence supporting the use of convection-permitting global variable-resolution simulations for studying and improving forecasting of extreme precipitation over East China and motivates the need for a more systematic study of heavy precipitation events and the impacts of physics parameterizations and topography in the future. The key points are as follows. Model for Prediction Across Scales (MPAS) simulations at global uniform and variable resolutions share similar characteristics of precipitation and wind in the refined region. Numerical experiments reveal significant impacts of resolution on simulating the distribution and intensity of precipitation and updrafts. This study provides evidence supporting the use of convection-permitting global variable-resolution simulation to study extreme precipitation.

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Li, Wending, and Guanglin Shi. "Novel dual-redundancy electro-hydrostatic actuator research and controller design." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 16 (June 14, 2019): 5874–86. http://dx.doi.org/10.1177/0954406219855093.

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The paper proposes a novel dual-redundancy motor pump for the electro-hydrostatic actuator. Rather than the traditional single motor pump electro-hydrostatic actuator system, the system proposed in this paper can operate in three working modes and automatically adjust its operating condition in accordance with task requirements. The novel dual-redundancy electro-hydrostatic actuator system prototype was developed, and a high-performance control method was proposed and applied to the system, combining proportional–integral–derivative and sliding mode control to study the control strategy and implementation method of double closed loop. In addition, a physical model simulation was conducted on the basis of Amesim for this electro-hydrostatic actuator under several working conditions. Results showed that the dual-redundancy electro-hydrostatic actuator can decrease power loss and demonstrate excellent performance and reliability.

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Xiao, Jianwei, Jinglian Du, Bin Wen, Roderick Melnik, Yoshiyuki Kawazoe, and Xiangyi Zhang. "Phase stability limit of c-BN under hydrostatic and non-hydrostatic pressure conditions." Journal of Chemical Physics 140, no. 16 (April 28, 2014): 164704. http://dx.doi.org/10.1063/1.4871897.

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Pospíšil, Jiří, and Rostislav Dandoš. "Basic Principles of Hydrostatic Levelling." GeoScience Engineering 64, no. 2 (June 1, 2018): 12–21. http://dx.doi.org/10.2478/gse-2018-0008.

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Abstract The paper aims to introduce the distribution, history and the basic physical principles hydrostatic levelling. The principle of this method is based on known law of connected vessels filled with fluid. Well known equipment is surface water level, the height of the surface is deducted on millimetre scale. There are currently used devices that allow deducting with accuracy of 0.01 mm.

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Christensen-Dalsgaard, J. "Internal Structure." Highlights of Astronomy 10 (1995): 323–26. http://dx.doi.org/10.1017/s1539299600011369.

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In this section I concentrate on the spherically symmetric aspects of solar structure, corresponding to “classical” stellar evolution models. Such models are characterized by a number of simplifying assumptions, as well as by the physical properties of matter in the star, conveniently labeled “micro-physics”. The latter include descriptions of the equation of state, the opacity and the nuclear reaction rates; in addition, molecular diffusion, included in several recent calculations, should be considered as part of the micro-physics. The assumptions in the standard calculations, simplifying what might be called the macro-physics, include the neglect of effects of rotation and magnetic fields (implicit in the assumption of spherical symmetry), as well as the assumption that material mixing occurs only in convectively unstable regions, or possibly as a result of molecular diffusion and settling; also, convective energy transport is treated crudely through some form of mixing-length approximation and the contribution to hydrostatic balance from the turbulent motion in the convection zone, usually called turbulent pressure, is ignored.

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Barnes, David J., Mark Vogelsberger, Francesca A. Pearce, Ana-Roxana Pop, Rahul Kannan, Kaili Cao, Scott T. Kay, and Lars Hernquist. "Characterizing hydrostatic mass bias with mock-X." Monthly Notices of the Royal Astronomical Society 506, no. 2 (May 7, 2021): 2533–50. http://dx.doi.org/10.1093/mnras/stab1276.

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ABSTRACT Surveys in the next decade will deliver large samples of galaxy clusters that transform our understanding of their formation. Cluster astrophysics and cosmology studies will become systematics limited with samples of this magnitude. With known properties, hydrodynamical simulations of clusters provide a vital resource for investigating potential systematics. However, this is only realized if we compare simulations to observations in the correct way. Here we introduce the mock-X analysis framework, a multiwavelength tool that generates synthetic images from cosmological simulations and derives halo properties via observational methods. We detail our methods for generating optical, Compton-y and X-ray images. Outlining our synthetic X-ray image analysis method, we demonstrate the capabilities of the framework by exploring hydrostatic mass bias for the IllustrisTNG, BAHAMAS, and MACSIS simulations. Using simulation derived profiles we find an approximately constant bias b ≈ 0.13 with cluster mass, independent of hydrodynamical method, or subgrid physics. However, the hydrostatic bias derived from synthetic observations is mass-dependent, increasing to b = 0.3 for the most massive clusters. This result is driven by a single temperature fit to a spectrum produced by gas with a wide temperature distribution in quasi-pressure equilibrium. The spectroscopic temperature and mass estimate are biased low by cooler gas dominating the emission, due to its quadratic density dependence. The bias and the scatter in estimated mass remain independent of the numerical method and subgrid physics. Our results are consistent with current observations and future surveys will contain sufficient samples of massive clusters to confirm the mass dependence of the hydrostatic bias.

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ZHAO Lijuan, 赵丽娟, 赵海英 ZHAO Haiying, and 徐志钮 XU Zhiniu. "基于布里渊动态光栅的高灵敏度静压力传感器设计." ACTA PHOTONICA SINICA 50, no. 2 (2021): 21. http://dx.doi.org/10.3788/gzxb20215002.0206001.

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Li, Y., C. Mao, R. Tu, L. Xue, H. Li, J. Wang, Z. Chen, H. Ni, and Y. Hu. "Physical properties of Ti3SiC2/Zr heterojunction under hydrostatic pressure." IOP Conference Series: Materials Science and Engineering 544 (July 9, 2019): 012053. http://dx.doi.org/10.1088/1757-899x/544/1/012053.

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Vázquez-Gutiérrez, J. L., M. Hernández-Carrión, A. Quiles, and I. Hernando. "Influence of storage at 4°C on the stability of high hydrostatic pressure treated onion." Czech Journal of Food Sciences 32, No. 1 (February 18, 2014): 96–101. http://dx.doi.org/10.17221/471/2012-cjfs.

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The effects of refrigerated storage on the microstructure and physicochemical properties of high hydrostatic pressure (HHP) treated onion were evaluated. Onion was submitted to 100 MPa at 50°C or 400 MPa at 25°C for 5 min, and stored for 28 days at 4°C. Electron microscopy techniques and light microscopy were used for the microstructural study. Total soluble phenolics, soluble protein percentage, and shear force were also studied. HHP treatments affected the cell wall and membrane permeability, favouring the diffusion of soluble material to the apoplast. Storage at 4°C also caused important structural degradation in the HHP-treated samples, which was higher when 400 MPa at 25°C were applied and led to physico-chemical changes during the first week of storage. Interactions between phenolics and solubilised cell wall material or proteins could explain the decrease in soluble phenolics and proteins during storage.  

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Anandaram, M. N. "Emden’s Polytropes: Gas Globes In Hydrostatic Equilibrium." Mapana - Journal of Sciences 12, no. 1 (February 20, 2013): 99–127. http://dx.doi.org/10.12723/mjs.24.9.

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The theory of polytropes dealing with the hydrostatic equilibrium structure of gas globes had its origin in Emden’s publication, Gaskugeln a century ago (1907). This review article has been written for students of physics and astrophysics not only to understand the theory of polytropes as the simplest of stellar models but also computationally solve the Lane-Emden equation for polytropes. Anyone can easily obtain values of normalized temperature, density, pressure and mass distribution as a function of the normalized radius or mass in any polytrope model in tabular form as well as in graphical form using the program code. Explanation of the algorithm to write a code is provided (python script on request). A graphical description of how the polytropic index determines the structure of the polytrope is also given.

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Ucar, Nazim, Ahmet Faruk Özdemira, Durmus Ali Aldemira, and Güven Çankayab. "Time Dependence of Current–Voltage Characteristics of Pb/p-Si Schottky Diode under Hydrostatic Pressure." Zeitschrift für Naturforschung A 66, no. 8-9 (September 1, 2011): 576–80. http://dx.doi.org/10.5560/zna.2011-0005.

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Abstract The effect of time on the characteristic parameters of Pb/p-Si Schottky diodes has been presented as a function of hydrostatic pressure. Current-voltage curves of the Pb=p-Si Schottky diodes have been measured at immediate, 15, 30, 60, and 120 min intervals under 1, 2, and 4 kbar hydrostatic pressure. It has been found that the values of the ideality factor have been approximately unchanged with increasing time. On the other hand, the barrier height of the Pb=p-Si structure slowly increase with increasing time, while these parameters also change with hydrostatic pressure. The diode shows nonideal current-voltage behaviour with an ideality factor greater than unity that can be ascribed to the interfacial layer and the interface states. In addition, the Schottky barrier height increases with a linear pressure coefficient of 92 meV=kbar, which is higher than the pressure coefficient of the silicon fundamental band gap.

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Ganci, Salvatore. "A hydrostatic paradox revisited." Physics Education 47, no. 2 (February 20, 2012): 152–54. http://dx.doi.org/10.1088/0031-9120/47/2/152.

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Majumdar, Arnab, Adebayo A. Adeleke, Sudip Chakraborty, and Rajeev Ahuja. "Emerging piezochromism in lead free alkaline earth chalcogenide perovskite AZrS3 (A = Mg, Ca, Sr and Ba) under pressure." Journal of Materials Chemistry C 8, no. 46 (2020): 16392–403. http://dx.doi.org/10.1039/d0tc04516k.

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NÚÑEZ-REGUEIRO, MANUEL. "C60 UNDER PRESSURE." Modern Physics Letters B 06, no. 19 (August 20, 1992): 1153–58. http://dx.doi.org/10.1142/s0217984992002039.

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The high pressure experiments done on fullerenes are reviewed. C 60 has found to be stable up to about 20 GPa at room temperature and hydrostatic conditions. Application of stronger, or non-hydrostatic, pressures at room temperature can induce the formation of a partially sp3 bonded phase, that apparently conserves the fullerene cage. Extreme non-hydrostatic compressions above about 15 GPa can, though, break down the cage and produce amorphous or cubic diamond. Destruction of the cage at high temperatures has also been observed, but the resulting product is amorphous sp2 material. A preliminary pressure-temperature phase diagram for C 60 is proposed.

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Jang, Jihyeon, and Song-You Hong. "Comparison of Simulated Precipitation over East Asia in Two Regional Models with Hydrostatic and Nonhydrostatic Dynamical Cores." Monthly Weather Review 144, no. 10 (October 2016): 3579–90. http://dx.doi.org/10.1175/mwr-d-15-0428.1.

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This study examines the characteristics of a nonhydrostatic dynamical core compared to a corresponding hydrostatic dynamical core in the Regional Model Program (RMP) of the Global/Regional Integrated Model system (GRIMs), a spectral model for regional forecasts, focusing on simulated precipitation over Korea. This kind of comparison is also executed in the Weather Research and Forecasting (WRF) finite-difference model with the same physics package used in the RMP. Overall, it is found that the nonhydrostatic dynamical core experiment accurately reproduces the heavy rainfall near Seoul, South Korea, on a 3-km grid, relative to the results from the hydrostatic dynamical core in both models. However, the characteristics of nonhydrostatic effects on the simulated precipitation differ between the RMP and WRF Model. The RMP with the nonhydrostatic dynamical core improves the local maximum, which is exaggerated in the hydrostatic simulation. The hydrostatic simulation of the WRF Model displaces the major precipitation area toward the mountainous region along the east coast of the peninsula, which is shifted into the observed area in the nonhydrostatic simulation. In the simulation of a summer monsoonal rainfall, these nonhydrostatic effects are negligible in the RMP, but the simulated monsoonal rainfall is still influenced by the dynamical core in the WRF Model even at a 27-km grid spacing. One of the reasons for the smaller dynamical core effect in the RMP seems to be the relatively strong horizontal diffusion, resulting in a smaller grid size of the hydrostatic limit.

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Rauscher, T., A. Heger, R. D. Hoffman, and S. E. Woosley. "Hydrostatic and explosive nucleosynthesis in massive stars using improved nuclear and stellar physics." Nuclear Physics A 718 (May 2003): 463–65. http://dx.doi.org/10.1016/s0375-9474(03)00852-2.

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Bucur, Voichita, Simone Garros, and Claire Y. Barlow. "The Effect of Hydrostatic Pressure on Physical Properties and Microstructure of Spruce and Cherry." Holzforschung 54, no. 1 (January 28, 2000): 83–92. http://dx.doi.org/10.1515/hf.2000.013.

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Summary The effect of hydrostatic pressure on the density, the ultrasonic velocities and the microstructure of spruce and cherry wood has been studied. Generally speaking, under hydrostatic pressure wood becomes less heterogeneous and less anisotropic than natural wood. In spruce, crushing and buckling of the thin-walled cells in the earlywood takes place. This also has the effect of disrupting the medullary rays, which assume a zig-zag path through the structure. Cherry has a much more homogeneous structure, and the main effect of the hydrostatic pressure is compaction of the vessels by buckling of the walls. The fibres are scarcely affected by the treatment. The width of the earlywood zone decreased after the application of pressure by 26% in spruce, and by 11% in cherry. The average density was increased by the hydrostatic pressure by 26% for spruce and by 46% for cherry. The densitometric profile of spruce demonstrates significant changes following the pressure treatment, with the minimum density DMin increasing and the maximum density DMax decreasing. For cherry, the densitometric profile is shifted rather uniformly towards higher densities, and the annual ring profile is spatially slightly compacted but otherwise similar to that of untreated wood. The anisotropy of wood (expressed by the ratio of acoustic invariants) decreased by 56% for spruce and by 33% for cherry. The structural damage in spruce is predominantly found in the radial (R) direction, and this corresponds to a reduction of 73% in the velocity of the longitudinal ultrasonic waves in the radial direction, VRR. In cherry, the structural damage is mainly in the transverse, T direction. The velocity of the longitudinal ultrasonic waves in the transverse direction, VTT is reduced by 44%. The medullary rays in cherry seem to be the most important anatomical feature influencing the propagation of ultrasonic waves.

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38

Braunschweig, F., and H. Ba¨ssler. "Photopolymerization of diacetylenes under hydrostatic pressure." Chemical Physics 93, no. 2 (February 1985): 307–18. http://dx.doi.org/10.1016/0301-0104(85)80027-6.

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Sienkiewicz, A., and M. Jaworski. "High hydrostatic pressure ESR manostats." High Pressure Research 5, no. 1-6 (April 1990): 877–79. http://dx.doi.org/10.1080/08957959008246286.

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Del Corro, Elena, Jesús González, Mercedes Taravillo, Walter Escoffier, and Valentín G. Baonza. "Graphite under non-hydrostatic conditions." High Pressure Research 28, no. 4 (December 2008): 583–86. http://dx.doi.org/10.1080/08957950802444796.

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Ang, D., and R. V. Ramanujan. "Hydrostatic stress and hydrostatic stress gradients in passivated copper interconnects." Materials Science and Engineering: A 423, no. 1-2 (May 2006): 157–65. http://dx.doi.org/10.1016/j.msea.2005.10.079.

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42

Scala, Karina Di, Antonio Vega-Gálvez, Kong Ah-Hen, Yissleen Nuñez-Mancilla, Gipsy Tabilo-Munizaga, Mario Pérez-Won, and Claudia Giovagnoli. "Chemical and physical properties of aloe vera (Aloe barbadensis Miller) gel stored after high hydrostatic pressure processing." Food Science and Technology 33, no. 1 (February 20, 2013): 52–59. http://dx.doi.org/10.1590/s0101-20612013005000002.

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The aim of this study was to evaluate the influence of high hydrostatic pressure (150, 250, 350, 450, and 550 MPa), applied for 5 minutes, on antioxidant capacity, total phenolic content, color, firmness, rehydration ratio, and water holding capacity of aloe vera gel stored for 60 days at 4 °C. The analyzed properties of the pressurized gel showed significant changes after the storage period. The highest value of total phenolic content was found at 550 MPa. However, a decrease in the antioxidant capacity was observed for all pressurized gel samples when compared to the control sample (p < 0.05). The smallest changes in product color were observed at pressure levels between 150 and 250 MP. The application of high hydrostatic pressure resulted in lower gel firmness, and the lowest value was found at 150 MPa (p < 0.05). On the other hand, the untreated sample showed a greater decrease in firmness, indicating that high pressure processing preserves this property. The application of high hydrostatic pressure exhibited modifications in the food matrix, which were evaluated in terms of rehydration ratio and water holding capacity.

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Gibbon, J. D., and D. D. Holm. "Extreme events in solutions of hydrostatic and non-hydrostatic climate models." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1939 (March 28, 2011): 1156–79. http://dx.doi.org/10.1098/rsta.2010.0244.

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Initially, this paper reviews the mathematical issues surrounding hydrostatic primitive equations (HPEs) and non-hydrostatic primitive equations (NPEs) that have been used extensively in numerical weather prediction and climate modelling. A new impetus has been provided by a recent proof of the existence and uniqueness of solutions of viscous HPEs on a cylinder with Neumann-like boundary conditions on the top and bottom. In contrast, the regularity of solutions of NPEs remains an open question. With this HPE regularity result in mind, the second issue examined in this paper is whether extreme events are allowed to arise spontaneously in their solutions. Such events could include, for example, the sudden appearance and disappearance of locally intense fronts that do not involve deep convection. Analytical methods are used to show that for viscous HPEs, the creation of small-scale structures is allowed locally in space and time at sizes that scale inversely with the Reynolds number.

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Dwivedi, Abhilash, H. K. Poswal, K. K. Pandey, H. P. Liermann, Chitra Murli, and M. N. Deo. "High pressure studies on α-cristobalite form of Al0.5Ga0.5PO4: hydrostatic versus non-hydrostatic conditions." High Pressure Research 39, no. 1 (January 2, 2019): 81–91. http://dx.doi.org/10.1080/08957959.2018.1563603.

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Renardy, Michael. "On Hydrostatic Free Surface Problems." Journal of Mathematical Fluid Mechanics 13, no. 1 (September 19, 2009): 89–93. http://dx.doi.org/10.1007/s00021-009-0002-5.

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FU, Y. "TEMPERATURE AND HYDROSTATIC PRESSURE DEPENDENCE OF SUBBAND STRUCTURE IN GaAs/AlxGa1−xAs MULTIPLE QUANTUM WELL." Modern Physics Letters B 04, no. 14 (August 10, 1990): 917–20. http://dx.doi.org/10.1142/s0217984990001136.

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The temperature and hydrostatic pressure dependence of GaAs/AlxGa1−xAs multiple quantum well subband structures has been examined theoretically. Such effects on the subband energy measured from the corresponding band optimum are negligible, and therefore, the temperature and the hydrostatic pressure coefficients of these multiple quantum wells are dominated by those coefficients of the bulk GaAs bandgap.

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Li, Jun-Sheng, Zhi-Hai Zhang, You-Wen Liu, and Jian-Hui Yuan. "Simultaneous effects of hydrostatic pressure, temperature and aluminum concentration on nonlinear optical rectification, second- and third-harmonic generation in a GaAs/Ga1−xAlxAs morse quantum well." International Journal of Modern Physics B 33, no. 04 (February 10, 2019): 1950009. http://dx.doi.org/10.1142/s0217979219500097.

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In this work, the simultaneous effects of aluminum concentration, hydrostatic pressure and temperature on the nonlinear optical rectification (OR), second- and third-harmonic generation (SHG and THG) in a GaAs/Ga[Formula: see text]Al[Formula: see text]As morse quantum well (QW) are studied. The expressions of OR, SHG and THG in morse QW were derived with the use of the compact-density-matrix approach and iterative method. The simultaneous effects of aluminum concentration, hydrostatic pressure and temperature on the effective mass have been taken into account. It is found that (1) the presence of the aluminum concentration, hydrostatic pressure and temperature have a great influence on the symmetry of the system, the nonlinear OR, SHG and THG. (2) the variation of the resonant peaks of the OR and SHG shows complicated behavior as the temperature changes. (3) the temperature effect is weaker than the aluminum concentration and hydrostatic pressure effects on the nonlinear OR, SHG and THG. The influences of different parameters of GaAs/Ga[Formula: see text]Al[Formula: see text]As morse QW and applied field strengths on the nonlinear OR, SHG and THG are discussed.

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Liu, Yingjie, Pengyu Lv, Jun Ma, Ruobing Bai, and Hui Ling Duan. "Stress fields in hollow core–shell spherical electrodes of lithium ion batteries." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 470, no. 2172 (December 8, 2014): 20140299. http://dx.doi.org/10.1098/rspa.2014.0299.

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This paper presents a comprehensive model coupling the effects of hydrostatic stress, surface/interface stress, phase transformation and the structure of electrodes. First, the governing equation of moving phase interface with hydrostatic stress is established. Under the effect of hydrostatic stress, phase transformation process is much faster, which means phase transformation time is overestimated in previous publications. Then, a cross-scale analysis is presented to investigate the size effect owing to hydrostatic stress, surface stress and interface stress separately, which concludes that the effect of hydrostatic stress is significant for the stress field in microelectrode particles, whereas that of surface/interface stress is highlighted in nano-ones. Finally, an electrochemical variable ‘efficiency’ (ratio of effective capacity over total capacity) is defined. The advantages of hollow structure electrodes on stress and efficiency are analysed. The present model is helpful for the material and structure design of electrodes of lithium ion batteries.

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Oryński, Franciszek, and Witold Pawłowski. "Simulation and Experimental Research of the Grinder'S Wheelhead Dynamics." Journal of Vibration and Control 10, no. 6 (June 2004): 915–30. http://dx.doi.org/10.1177/1077546304041369.

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In this paper we present a simulation based on the physical model of a cylindrical, plunge grinder with hydrostatic slideways and hydrostatic bearings of a grinding wheel spindle. The simulation was carried out in order to check the influence of the grinding process on the forced vibration damping of the wheelhead. The experimental research was undertaken to verify the idea of the damping facility of the grinding process. The results of the experiments and the simulation were used to draw the final conclusions.

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You, Jin-Feng, Qiang Zhao, Zhi-Hai Zhang, Jian-Hui Yuan, Kang-Xian Guo, and Elmustapha Feddi. "The effect of temperature, hydrostatic pressure and magnetic field on the nonlinear optical properties of AlGaAs/GaAs semi-parabolic quantum well." International Journal of Modern Physics B 33, no. 27 (October 30, 2019): 1950325. http://dx.doi.org/10.1142/s0217979219503259.

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In this paper, we explore the optical properties of AlGaAs/GaAs semi-parabolic quantum well (QW) under different temperature, hydrostatic pressure and applied magnetic field. We calculate the nonlinear optical absorption coefficients and the refractive index changes (RICs) with the compact density-matrix approach and iterative method. Then, within the framework of the effective mass and parabolic-band approximations, the energy eigenvalues and the corresponding wave functions for semi-parabolic QW have been obtained by the finite difference method. The theoretical findings show that (1) the energy spectrum depends strongly on temperature, hydrostatic pressure and applied magnetic field; (2) the linear and third-order nonlinear optical absorption coefficients and the RICs are quite sensitive to temperature, hydrostatic pressure and applied magnetic field. Our study provides a theoretical basis for the fabrication of QW structure.

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Journal articles on the topic 'Physics Hydrostatics'

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