oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 2 )

2019 ( 56 )

2018 ( 193 )

2017 ( 225 )

Custom range...

Search Results: 1 - 10 of 6680 matches for " liquid physics "
All listed articles are free for downloading (OA Articles)
Page 1 /6680
Display every page Item
Fick’s Diffusion Experiments Revisited —Part II (English Translation of Fick’s Orginal Thinking)  [PDF]
Tad W. Patzek
Advances in Historical Studies (AHS) , 2014, DOI: 10.4236/ahs.2014.34018
Abstract: In this paper, we revisit Fick’s original diffusion experiments and reconstruct the geometry of his inverted funnel. In Part I, we show that Fick’s experimental approach was sound and measurements were accurate despite his own claims to the contrary. Using the standard modern approach, we predict Fick’s cylindrical tube measurements with a high degree of accuracy. We calculate that the salt reservoir at the bottom of the inverted funnel must have been about 5 cm in height and the unreported depth of the deepest salt concentration measurement by Fick was yet another 3 cm above the reservoir top. We verify the latter calculation by using Fick’s own calculated concentration profiles and show that the modern diffusion theory predicts the inverted funnel measurements almost as well as those in the cylindrical tube. In Part II, we provide a translation of Fick’s discussion of diffusion in liquids in the first edition of his three-volume monograph on Medical Physics published in 1856, one year after his seminal Pogendorff’s Annalen paper On Diffusion.
Foam drainage wave coalescing and its energy evolution
QiCheng Sun,Jin Huang,GuangQian Wang
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0426-y
Abstract: Liquid foam is a dense packing of gas bubbles in a small amount of surfactant solution. Liquid drains out of foams until equilibrium is reached due to the compromise between gravity and capillarity, which greatly affects the stability of foam. Based on a series of work on foam structure and drainage we conducted previously, this paper reports the results on coalescence of an original forced drainage wave at a low flow rate with subsequent drainage waves with higher flow rates. The evolutions of viscous energy and surface energy during the process of coalescence are theoretically analyzed.
Rapid solidification of undercooled Al-Cu-Si eutectic alloys
Ying Ruan,BingBo Wei
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-008-0540-x
Abstract: Under the conventional solidification condition, a liquid aluminium alloy can be hardly undercooled because of oxidation. In this work, rapid solidification of an undercooled liquid Al80.4Cu13.6Si6 ternary eutectic alloy was realized by the glass fluxing method combined with recycled superheating. The relationship between superheating and undercooling was investigated at a certain cooling rate of the alloy melt. The maximum undercooling is 147 K (0.18T E). The undercooled ternary eutectic is composed of α(Al) solid solution, (Si) semiconductor and θ(CuAl2) intermetallic compound. In the (Al+Si+θ) ternary eutectic, (Si) faceted phase grows independently, while (Al) and θ non-faceted phases grow cooperatively in the lamellar mode. When undercooling is small, only (Al) solid solution forms as the leading phase. Once undercooling exceeds 73 K, (Si) phase nucleates firstly and grows as the primary phase. The alloy microstructure consists of primary (Al) dendrite, (Al+θ) pseudobinary eutectic and (Al+Si+θ) ternary eutectic at small undercooling, while at large undercooling primary (Si) block, (Al+θ) pseudobinary eutectic and (Al+Si+θ) ternary eutectic coexist. As undercooling increases, the volume fraction of primary (Al) dendrite decreases and that of primary (Si) block increases.
Rapid solidification of undercooled Al-Cu-Si eutectic alloys

Ying Ruan,BingBo Wei,

科学通报(英文版) , 2009,
Abstract: Under the conventional solidification condition, a liquid aluminium alloy can be hardly undercooled because of oxidation. In this work, rapid solidification of an undercooled liquid Al80.4Cu13.6Si6 ternary eutectic alloy was realized by the glass fluxing method combined with recycled superheating. The relationship between superheating and undercooling was investigated at a certain cooling rate of the alloy melt. The maximum undercooling is 147 K (0.18T E). The undercooled ternary eutectic is composed of α(Al) solid solution, (Si) semiconductor and θ(CuAl2) intermetallic compound. In the (Al+Si+θ) ternary eutectic, (Si) faceted phase grows independently, while (Al) and θ non-faceted phases grow cooperatively in the lamellar mode. When undercooling is small, only (Al) solid solution forms as the leading phase. Once undercooling exceeds 73 K, (Si) phase nucleates firstly and grows as the primary phase. The alloy microstructure consists of primary (Al) dendrite, (Al+θ) pseudobinary eutectic and (Al+Si+θ) ternary eutectic at small undercooling, while at large undercooling primary (Si) block, (Al+θ) pseudobinary eutectic and (Al+Si+θ) ternary eutectic coexist. As undercooling increases, the volume fraction of primary (Al) dendrite decreases and that of primary (Si) block increases. Supported by the National Natural Science Foundation of China (Grant Nos. 50121101, 50395105) and the Doctorate Foundation of Northwestern Polytechnical University (Grant No. CX200419)
Pressure-driven structural transitions in molten salts
Romina Ruberto,Giorgio Pastore,Mario P. Tosi
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali , 2011,
Abstract: Liquid-structure types of molten salts near freezing at standard pressure have been classified on the basis of the relationship between melting entropy &DeltaS and melting volume &DeltaV in correlation with measured values of transport coefficients. Here we report on the evolution of these liquid-structure types under compression, with main attention to ZnCl2 and AlCl3 for which data from classical molecular dynamics simulations and from diffraction experiments exist.
Raman scattering investigation of the water-bridge phenomenon: Some preliminary results
Francesco Aliotta,Maria E. Fontanella,Rosina C. Ponterio,Franz Saija
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali , 2010,
Abstract: A floating water-bridge is formed if a high-voltage direct current is applied between two beakers filled of chemically pure water. Raman spectra of the OH-stretching region have been obtained at ambient condition of temperature and pressure. These preliminary results seem to indicate that the hydrogen-bond structure is only slightly modified by the presence of the electric field applied to form the floating water-bridge in agreement with recent neutron scattering investigation. In fact, the polarized Raman spectrum of the pure water and of the water-bridge is almost superimposable. We are planning to carry out further spectroscopic analysis, at different thermodynamic conditions, for better understanding the role played by the hydrogen-bond in driving the formation of the floating water-bridge.
Coupled multiple organic microcavities
Sara Stelitano,Alessandro Ridolfo
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali , 2010,
Abstract: Recently, organic based microcavities became a focal point in the boundary photonic research due to the special features of the organic active molecules whose properties may be easily modulated. By using the thermal evaporation we realized double and triple coupled-microcavity structures containing one or more active layers of light emitting organic molecules. The resonators are tuned at the same wavelength and coupled by low reflectivity mirrors. In particular we grew an asymmetric double system with only one active organic layer embedded in one microcavity. The reflectivity measurements show that the coupling between the two resonator results in a splitting of the optical modes. The photoluminescence spectra display a double wavelength emission. The comparison of the diagonalized effective Hamiltonian with the observed resonances further confirms the strong coupling between the two cavities. A quantum statistical approach for interacting quantum systems in the strong coupling regime reproduces with very good agreement the experimental results. The triple structure has been designed to improve the coupling among the resonators. The device shows three emission peaks at different wavelength and represents a very interesting start up to realize white organic based LEDs and ultrafast optical amplifiers.
Proton beams emission from laser-generated plasmas
Lorenzo Torrisi
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali , 2011, DOI: 10.1478/c1a8902001
Abstract: An alternative method employing large dimension ion accelerator systems to generate proton beams can be the production of ions by using a power pulsed laser, operating at high intensity, irradiating in vacuum hydrogenated targets and by extracting the ions of interest from the generated plasma. The choice of the adequate target, of the laser pulse intensity regime and of the ion current obtainable, is strongly dependent of the type of experimental apparatus, as will be discussed in the article. Proton beam emission from experiments conduced at low and high laser intensities are presented, in order to generate protons from about 100 eV, as that prepared at the Physics Department of Messina University, up to about 100 keV, as prepared at INFN-LNS of Catania, and up to about 1 MeV obtained at the international PALS Laboratory of Prague, Czech Republic.
History of Two Fundamental Principles of Physics: Least Action and Conservation of Energy  [PDF]
Agamenon R. E. Oliveira
Advances in Historical Studies (AHS) , 2014, DOI: 10.4236/ahs.2014.32008
Abstract: One of the aims most sought after by physics along the years has been to find a principle, the simplest possible, into which all natural phenomena would fit, and which would also allow the calculation of all past occurrences and principally future occurrences. Evidently, this is far from being reached and quite probably does not even exist. Nevertheless, an approximation to this ideal is always possible and the history of physics shows that some results in this direction have been achieved. Thus, the history of the principles of least action and conservation of energy presented in this paper explains the search for this ideal.
The Origin of Gravitational and Electric Forces, the Nature of Electromagnetic Waves  [PDF]
Raoul Charreton
Journal of Quantum Information Science (JQIS) , 2012, DOI: 10.4236/jqis.2012.23014
Abstract: We have proposed a prequantum physics, itself founded on classical mechanics completed by the existence of an universal cloud of tiny particles noted U. These U particle command the mass, variable, of electron, neutron, proton, and atom particles noted M. The “shocks” between U and M particles in the cloud, with screen effect, give birth to electrical forces among charged particles with very small differences between attractive and repulsive forces, and to certain gravitational forces. This cloud with the electromagnetic waves propagating thus recalls an ether, yet much different regarding its effects on the inertial mass of any particle within it. The electromagnetic wave and the photon look like if they were born from a statistical mechanics induced by the universal cloud, and their status, in this regard, may be compared to the status conferred by atomics to a temperature or a pressure. The wave transversality is explained. By the same token, one understands why the photon, a vectorial bearer of a statistical information, may thus describe a particle as well as a wave.
Page 1 /6680
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.