Pacific Rim Conference on Multimedia 

About: Pacific Rim Conference on Multimedia is an academic conference. The conference publishes majorly in the area(s): Phase transition & Feature (computer vision). Over the lifetime, 2973 publications have been published by the conference receiving 56018 citations.

Progress and new directions in high temperature calorimetry revisited

Abstract: High temperature reaction calorimetry has seen considerable advances over the past twenty years. New and more sensitive calorimeters, improved sample handling techniques, and better control of the final dissolved state has made solution calorimetry and drop solution calorimetry, using molten lead borate and other solvents, very versatile and reliable techniques. This paper summarizes these advances and presents examples of specific applications to problems of transition metal oxide chemistry, high pressure geophysics, melt and glass energetics, and metastable materials relevant to the earth sciences.

Progress and new directions in high temperature calorimetry

Abstract: Calorimetry at 600–900° C, using Calvet-type microcalorimeters, has provided data in several areas of interest to geology. The best-developed application is solution calorimetry in molten oxide solvents (lead borate, sodium molybdate) to determine the enthalpies of formation of anhydrous silicates and related minerals, the enthalpies of phase transformations and order-disorder reactions, and the enthalpies of mixing in molten salts, glasses, and solid solutions. An attractive feature of the technique is the ability to use rather small samples; ∼ 300 mg total often being sufficient for the study of a phase synthesized at high pressure. Current developments include the improvement of precision by careful control of solvent composition and water content, the development of alkali borate or borosilicate solvents for use under atmospheres of controlled oxygen fugacity, and the study of compounds containing fluorine as well as oxygen.

A review of electron spin spectroscopy and its application to the study of paramagnetic defects in crystalline quartz

Abstract: A comprehensive review (ca. 230 references) is presented of the present (1983) state of knowledge of paramagnetic defects in crystalline quartz, as derived from electron paramagnetic resonance spectroscopy and related techniques. An auxiliary description of relevant concepts in solid state electron paramagnetic resonance (EPR), suitable for the non-specialist, is included. The centres described include those arising from impurity ions (Al, H, Cu, Ag, Ge, P, Ti, Fe) as well as those (E′) associated with oxygen ions missing in the quartz structure. Emphasis is placed on the structural information derivable from EPR. A brief survey of the present state of understanding of the optical bands caused by the defects is also given.

Structural relaxation in silicate melts and non-Newtonian melt rheology in geologic processes

Abstract: The timescale of structural relaxation in a silicate melt defines the transition from liquid (relaxed) to glassy (unrelaxed) behavior. Structural relaxation in silicate melts can be described by a relaxation time, τ, consistent with the observation that the timescales of both volume and shear relaxation are of the same order of magnitude. The onset of significantly unrelaxed behavior occurs 2 log10 units of time above τ. In the case of shear relaxation, the relaxation time can be quantified using the Maxwell relationship for a viscoelastic material; τS = ηS/G∞ (where τS is the shear relaxation time, G∞ is the shear modulus at infinite frequency and ηS is the zero frequency shear viscosity). The value of G∞ known for SiO2 and several other silicate glasses. The shear modulus, G∞, and the bulk modulus, K∞, are similar in magnitude for every glass, with both moduli being relatively insensitive to changes in temperature and composition. In contrast, the shear viscosity of silicate melts ranges over at least ten orders of magnitude, with composition at fixed temperature, and with temperature at fixed composition. Therefore, relative to ηS, G∞ may be considered a constant (independent of composition and temperature) and the value of ηS, the relaxation time, may be estimated directly for the large number of silicate melts for which the shear viscosity is known.

Content-based Image Retrieval Using Gabor Texture Features

Abstract: Gabor wavelet proves to be very useful texture analysis and is widely adopted in the literature. In this paper we present a image retrieval method based on Gabor filter. Texture features are found by calculating the mean and variation of the Gabor filtered image. Rotation normalization is realized by a circular shift of the feature elements so that all images have the same dominant direction. The image indexing and retrieval are conducted on textured images and natural images. Experimental results are shown and discussed.