Download or read book Cristallisation L quilibre Et Hors quilibre D hydrates Mixtes de Gaz written by Saheb Maghsoodloobabakhani and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, in order to investigate the non-equilibrium behaviors of mixed clathrate hydrates, vapor-liquid-hydrate phase equilibria of mixed gas hydrates from CH4-C2H6-C3H8-nC4H10-CO2-N2 are studied. Two different experimental procedures are used: at quick and slow crystallization rates. The aim is to examine the effects of crystallization rate on the final state, either under usual dynamic (quick formation) or steady state conditions (slow formation). Unlike most of the literature data, providing temperature-pressure-vapor composition (PTy) results, this study also furnishes hydrate composition, volume, storage capacity, density, or hydration number and water conversion. At quick crystallization, hydrate volume increases from 2% to 69% according to the gas mixture. Moreover, storage capacity decreases with increasing rate of crystallization. In addition, a thermodynamic model, based on classical van der Waals and Platteuw method and Kihara potential, has been used. A new set of Kihara parameters for propane, based on slow crystallization, has been obtained successfully and compared to the literature.Besides, a review on guest composition in hydrates from experimental results is suggested, based on open literature. Then, the capability of thermodynamic modeling to simulate these rare data has been investigated. While simulation tools are interesting to predict phase equilibria for light molecules, they become less reliable when phase transition occurs in the system, or when heavier molecules are involved. In addition, the use of RAMAN spectroscopy has illustrated phase transition for CO2/C3H8 mixed hydrates under CO2 rich gas conditions.To conclude, the rate of crystallization significantly influences the process of mixed hydrates formation. The use of a thermodynamic flash shows that slow crystallization is necessary to satisfy the thermodynamic equilibrium, and thus increase storage capacity, and optimize hydrate processes.

Download or read book Equilibre Des Hydrates de Gaz en Pr sence D un M lange D hydrocarbures Gazeux written by Duyen Le Quang and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many studies have been conducted since 1778's to study the formation of clathrate hydrates of gas, especially under conditions of high pressure and low temperature to reproduce the conditions of oil production. My thesis mainly concerns the study of the thermodynamic of gas hydrates in presence of hydrocarbon: CO2 CH4, C2H6, C3H8, and C4H10 pure or in gas mixtures. The experimental results of this work complete the literature experimental results, were used to optimize the internal parameters related to the thermodynamic model data base GasHyDyn software.This model optimizes the parameters of Kihara and allows us to retain a second time , or to exclude a particular data set, considered as points of equilibrium , or balance points out .We finally discuss the reason for non-equilibrium of certain points, however, considered by their authors as equilibrium points. This seems kind of kinetic considerations related to a competition between gas hydrate structure to integrate during growth .

Download or read book A German English Dictionary for Chemists written by Austin M 1876-1956 Patterson and published by Scholar Select. This book was released on 2015-08-08 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Download or read book Advances in Uranium Ore Processing and Recovery from Non conventional Resources written by International Atomic Energy Agency and published by Agency. This book was released on 1985 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oxidative Stress and Redox Regulation written by Ursula Jakob and published by Springer Science & Business Media. This book was released on 2013-03-15 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many physiological conditions such as host defense or aging and pathological conditions such as neurodegenerative diseases, and diabetes are associated with the accumulation of high levels of reactive oxygen species and reactive nitrogen species. This generates a condition called oxidative stress. Low levels of reactive oxygen species, however, which are continuously produced during aerobic metabolism, function as important signaling molecules, setting the metabolic pace of cells and regulating processes ranging from gene expression to apoptosis. For this book we would like to recruit the experts in the field of redox chemistry, bioinformatics and proteomics, redox signaling and oxidative stress biology to discuss how organisms achieve the appropriate redox balance, the mechanisms that lead to oxidative stress conditions and the physiological consequences that contribute to aging and disease.

Download or read book A Phonetic Dictionary of the English Language written by Hermann Michaelis and published by . This book was released on 1913 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Uranium Extraction Technology written by International Atomic Energy Agency and published by . This book was released on 1993 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this publication is to update and expand the first edition, which was published in 1983, and to report on later advances in uranium ore processing. It includes background information about the principles of the unit operations used in uranium ore processing and summarizes the current state of the art. Extensive references provide sources for specific technological details.

Download or read book Sap sugar Content of Grafted Sugar Maple Trees written by Maurice E. Demeritt and published by . This book was released on 1985 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mini tapping Sugar Maples for Sap sugar Testing written by William J. Gabriel and published by . This book was released on 1982 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of watering and fertilization on carbohydrate reserves in sugar maple seedlings written by Clayton M. Carl and published by . This book was released on 1978 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shoot Size Significantly Affects Rooting Response of Sugar Maple Softwood Cuttings written by John R. Donnelly and published by . This book was released on 1974 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atomic Energy Programs written by U.S. Atomic Energy Commission and published by . This book was released on 1973 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sugar Maple Sap Volume Increases as Vacuum Level is Increased written by Russell S. Walters and published by . This book was released on 1975 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Physiological Ecology of Woody Plants written by Theodore T. Kozlowski and published by Academic Press. This book was released on 2012-12-02 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: The efficient management of trees and other woody plants can be improved given an understanding of the physiological processes that control growth, the complex environmental factors that influence those processes, and our ability to regulate and maintain environmental conditions that facilitate growth. - Emphasizes genetic and environmental interactions that influence woody plant growth - Outlines responses of individual trees and tree communities to environmental stress - Explores cultural practices useful for efficient management of shade, forest, and fruit trees, woody vines, and shrubs

Download or read book Sapstreak Disease of Sugar Maple written by Kenneth J. Kessler and published by . This book was released on 1972 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flooding and Plant Growth written by Bozzano G Luisa and published by Academic Press. This book was released on 2012-12-02 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flooding and Plant Growth covers the state of knowledge and opinion on the effects of flooding of soil with fresh or salt water on the metabolism and growth of herbaceous and woody plants. The book discusses the extent, causes, and impacts of flooding; the effects of flooding on soils and on the growth and metabolism of herbaceous plants; and the responses of woody plants to flooding. The text also describes the effect of flooding on water, carbohydrate, and mineral relations, as well as the effects of flooding on hormone relations and on plant disease. The adaptations to flooding with fresh water and the adaptations of plants to flooding with salt water are also encompassed. Agronomists, biochemists, plant ecologists, engineers, foresters, horticulturists, plant anatomists, meteorologists, geneticists, plant breeders, plant physiologists, and landscape architects will find the book invaluable.

Download or read book Survival Growth and Juvenile mature Correlations in a West Virginia Sugar Maple Provenance Test 25 Years After Establishment written by Thomas M. Schuler and published by . This book was released on 1994 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Survival, total height, diameter at breast height (d.b.h.), and stem quality of sugar maple trees of different provenances were compared 25 years after establishment in north-central West Virginia. Provenances were from Michigan, Minnesota, West Virginia, Massachusetts, New Hampshire, Vermont, Maine, and Quebec, Canada. There were significant differences between provenances for all traits except stem quality. By provenance; total tree height ranged from about 49 to 37 feet; d.b.h. from 6.7 to 3.6 inches; and survival from 100 to 15 percent. The predictability of total tree height 25 years after establishment based on mean provenance height at age 2, 6, 10, and 15 years is discussed. Results suggest that juvenile height growth may be a good predictor of mature height performance, thus decreasing the need for rotation-length trials.