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PENGECORAN SQUEEZE
Soejono Tjitro,Firdaus Firdaus
Jurnal Teknik Mesin , 2000,
Abstract: Squeeze casting, also known as liquid metal forging, is a term commonly used to describe a process by which molten metal solidifies under pressure within closed dies position between the plates of a hydraulic press. The applied pressure and instant contact of the molten metal with the die surface produce a rapid heat transfer condition that yields a pore-free fine grain casting with mechanical properties. Which is similar to those of wrought products. This papers reviews aspect of recent progress in the development of current squeeze casting techniques, and address both the advantages and limitations of the various processes. Abstract in Bahasa Indonesia : Pengecoran squeeze, yang juga dikenal dengan istilah penempaan logam cair, merupakan suatu istilah yang dipakai untuk menggambarkan suatu proses dimana logam cair didinginkan di dalam cetakan tertutup sambil diberi tekanan luar yang biasanya berasal dari tenaga hidrolik. Tekanan yang diberikan serta kontak langsung antara logam cair dengan dinding cetakan akan menyebabkan terjadi perpindahan panas secara cepat yang memungkinkan untuk menghasilkan produk cor dengan porositas rendah serta memiliki ukuran butir yang halus dengan sifat mekanik yang mendekati produk tempa umumnya. Karya tulis ini mencoba mengkaji perkembangan terkini dari pengecoran squeeze serta keunggulan dan keterbatasan proses ini dibandingkan proses-proses lainnya. Kata kunci: pengecoran squeeze langsung, pengecoran squeeze tak langsung
Squeezing Operator and Squeeze Tomography  [PDF]
Octavio Castanos,Ramon Lopez-Pena,Margarita A. Man'ko,Vladimir I. Man'ko
Physics , 2004,
Abstract: Some properties of Plebanski squeezing operator and squeezed states created with time-dependent quadratic in position and momentum Hamiltonians are reviewed. New type of tomography of quantum states called squeeze tomography is discussed.
Two Different Squeeze Transformations  [PDF]
D. Han,Y. S. Kim
Physics , 1996,
Abstract: Lorentz boosts are squeeze transformations. While these transformations are similar to those in squeezed states of light, they are fundamentally different from both physical and mathematical points of view. The difference is illustrated in terms of two coupled harmonic oscillators, and in terms of the covariant harmonic oscillator formalism.
Interpretation Literary Texts That Breathe on Interdisciplinary in Nature  [PDF]
Otgonsuren Jargal
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.79017
Abstract: The analytical point of view of literature is leaning toward the ecological and social change in the world. Based on the concept “words that breathe or texts that breathe” which is initiated idea by doctor Jose Marrero Henriquez for analyzing in eco-criticism, I would like to extend this line of thinking and trying to interpret it. Aforementioned words or literary texts that breathe, appear to be some relationship with meditation, which concentrates on the breath a human being. From this point of view, the eco-analysis of literature is a way of looking at the path between ecocriticism and Buddhism, regardless of tradition. This is an attempt to do interpretation by ecocriticism on novel by Gun Ayurzana, “Shugden” (2012) which talks story of one of separated ethnic groups in Mongolia, interconnected each other to religious and philosophical issues.
Optimisation Geometry  [PDF]
Jonathan H. Manton
Mathematics , 2012,
Abstract: This article demonstrates how an understanding of the geometry of a family of cost functions can be used to develop efficient numerical algorithms for real-time optimisation. Crucially, it is not the geometry of the individual functions which is studied, but the geometry of the family as a whole. In some respects, this challenges the conventional divide between convex and non-convex optimisation problems because none of the cost functions in a family need be convex in order for efficient numerical algorithms to exist for optimising in real-time any function belonging to the family. The title "Optimisation Geometry" comes by analogy from the study of the geometry of a family of probability distributions being called information geometry.
Spectral properties of the squeeze operator  [PDF]
Dariusz Chruscinski
Physics , 2004, DOI: 10.1016/j.physleta.2004.05.046
Abstract: We show that a single-mode squeeze operator S(z) being an unitary operator with a purely continuous spectrum gives rise to a family of discrete real generalized eigenvalues. These eigenvalues are closely related to the spectral properties of S(z) and the corresponding generalized eigenvectors may be interpreted as resonant states well known in the scattering theory. It turns out that these states entirely characterize the action of S(z). This result is then generalized to N-mode squeezing.
The densification mechanism of squeeze casting  [PDF]
Xiao-Hui Chen,Xu Huang,Xue-Ping. Ren
Physics , 2009,
Abstract: The solidification process during squeeze casting is analyzed based on the classical solidification and plastic deformation theory. The linear relationship between punch velocity and the solidification rate is established if the density change of molten meals is neglected. To obtain defect-free castings, the punch velocity should be larger than the solidification rate. The densification mechanism is also discussed. The plastic deformation will result in the radical movement of the central molten metals, which reduces the temperature gradient from the center to the mold wall, which provides the condition to obtain defect-free castings: simultaneous nucleation.
Rheodynamic lubrication of a squeeze film bearing under sinusoidal squeeze motion
Kandasamy, A.;Vishwanath, K.P.;
Computational & Applied Mathematics , 2007, DOI: 10.1590/S0101-82052007000300004
Abstract: lubricants with variable viscosity are assuming importance for their applications in polymer industry, thermal reactors and in biomechanics. with the bearing operations in machines being subjected to high speeds, loads, increasing mechanical shearing forces and continually increasing pressures, there has been an increasing interest to use non-newtonian fluids characterized by an yield value. the most elementary constitutive equation in common use that describes a material which yields is that of bingham fluid. in the present work, the problem of a circular squeeze film bearing lubricated with bingham fluid under the sinusoidal squeeze motion has been analyzed. the shape and extent of the core for the case of sinusoidal squeeze motion has been determined numerically for various values of the bingham number. numerical solutions have been obtained for the bearing performances such as pressure distribution and load capacity for different values of bingham number, reynolds number and for various amplitudes of squeeze motion. the effects of fluid inertia, non-newtonian characteristics, and the amplitudes of squeeze motion on the bearing performances have been discussed.
Rheodynamic lubrication of a squeeze film bearing under sinusoidal squeeze motion  [cached]
A. Kandasamy,K.P. Vishwanath
Computational and Applied Mathematics , 2007,
Abstract: Lubricants with variable viscosity are assuming importance for their applications in polymer industry, thermal reactors and in biomechanics. With the bearing operations in machines being subjected to high speeds, loads, increasing mechanical shearing forces and continually increasing pressures, there has been an increasing interest to use non-Newtonian fluids characterized by an yield value. The most elementary constitutive equation in common use that describes a material which yields is that of Bingham fluid. In the present work, the problem of a circular squeeze film bearing lubricated with Bingham fluid under the sinusoidal squeeze motion has been analyzed. The shape and extent of the core for the case of sinusoidal squeeze motion has been determined numerically for various values of the Bingham number. Numerical solutions have been obtained for the bearing performances such as pressure distribution and load capacity for different values of Bingham number, Reynolds number and for various amplitudes of squeeze motion. The effects of fluid inertia, non-Newtonian characteristics, and the amplitudes of squeeze motion on the bearing performances have been discussed.
Inward Leakage in Tight-Fitting PAPRs  [PDF]
Frank C. Koh,Arthur T. Johnson,Timothy E. Rehak
Journal of Environmental and Public Health , 2011, DOI: 10.1155/2011/473143
Abstract: A combination of local flow measurement techniques and fog flow visualization was used to determine the inward leakage for two tight-fitting powered air-purifying respirators (PAPRs), the 3M Breathe-Easy PAPR and the SE 400 breathing demand PAPR. The PAPRs were mounted on a breathing machine head form, and flows were measured from the blower and into the breathing machine. Both respirators leaked a little at the beginning of inhalation, probably through their exhalation valves. In both cases, the leakage was not enough for fog to appear at the mouth of the head form.
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