Download or read book Contribution l tude de d gradation in situ des pesticides par proc d s d oxydation avanc s faisant intervenir le fer written by Mohamed Chakib Edelahi and published by . This book was released on 2004 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les procédés dits d’oxydation avancés (POA) permettent la dégradation totale (minéralisation) en milieu aqueux des molécules organiques toxiques pour l’homme et pour l’environnement. Le procédé Electro-Fenton qui fait partie des POA est appliqué dans le cadre de ce travail à la minéralisation des solution aqueuses d'herbicides chlorophénylurées. Les performances de ce procédé ont été comparés avec d'autres procédé POA fraisant intervenir les ions de fer (ferreux ou ferriques) tels que le réactif de Fenton et le procédé photo-Fenton. Dans le cas des molécules étudiées (diuron, monuron et fénuron), il a été montré que le taux de minéralisation par le procédé Fenton (Fe2+/H2O2) augmente avec l’augmentation des doses des réactifs et du temps de réaction. Dans le cas de la dégradation photochimique (irradiation UV), la vitesse de dégradation et le taux de minéralisation sont très faibles. La vitesse de dégradation des molécules mères et le taux de minéralisation des solutions d’herbicides étudiés peuvent être significativement augmentés par le couplage de la photochimie le réactif de Fenton (Fe2+/ H2O2). Ce couplage permet aussi de diminuer la durée d’irradiation et faire économiser d’énergie. Dans le cas du procédé Electro-Fenton, la cinétique de dégradation et de minéralisation dépend des paramètres expérimentaux tels que la concentration du catalyseur, l’intensité du courant appliqué, le pH du milieu, etc. La réactivité des chlorophénylurées vis-à-vis des radicaux hydroxyles varie en fonction du nombre d’atomes de chlore substitués sur le cycle aromatique. La vitesse de réaction de dégradation croît dans l’ordre suivant : diuron (2 Cl substitués), monuron (1 Cl substitué) et fénuron (sans Cl substitué. L’étude de la minéralisation de ces herbicides a montré que les taux d’abattement de carbone organique en terme de DCO dépassent les 90% pour une durée de traitement de 3 heures dans le cas du procédé Electro-Fenton. Le mécanisme de minéralisation des herbicides chlorophénylurées est initié par l’attaque des radicaux hydroxyles de la molécule de départ sur deux sites : le groupement N-terminal et le cycle aromatique générant des sous-produits. Plusieurs sous-produits de dégradation aromatiques qui sont principalement issus d’une oxydation du groupement N-terminal suivie d’une hydroxylation du cycle aromatique et de substitution d’atomes de chlore sur le cycle aromatique ont été identifiés. Des oxydations successives mènent à l’ouverture oxydante du cycle aromatique avec la formation des acides carboxyliques et ions minéraux. Une comparaison des performances de minéralisation par les différents procédés étudiés a montré que les procédés photo-Fenton et Electro-Fenton permettent d’atteindre des taux de minéralisation très important (de l’ordre de 93%). Le procédé Electro-Fenton semble être favorisé avec non utilisation de réactifs chimiques et une faible consommation d’énergie électrique
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Download or read book Stored grain Insects written by United States. Agricultural Research Service and published by . This book was released on 1978 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Molecular Mechanisms of Hormone Action written by Gesellschaft für Biologische Chemie. Colloquium and published by . This book was released on 1989 with total page 224 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.
Download or read book The Flow of Maple Sap written by A. H. Wood and published by . This book was released on 1895 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Maple Sugar Book written by Helen Nearing and published by Good Life Series. This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A half-century ago, the world was trying to heal the wounds of global war. People were rushing to make up for lost time, grasping for material wealth. This was the era of total electric living, a phrase beamed into living rooms by General Electric spokesman Ronald Reagan. Environmental awareness was barely a gleam in the eye of even Rachel Carson. And yet, Helen and Scott Nearing were on a totally different path, having left the city for the country, eschewing materialistic society in a quest for the self-sufficiency they deemed the Good Life. Chelsea Green is pleased to honor their example by publishing a new edition of The Maple Sugar Book, complete with a new section of never-before-published photos of the Nearings working on the sugaring operation, and an essay by Greg Joly relating the story behind the book and placing the Nearings' work in the context of their neighborhood and today's maple industry. Maple sugaring was an important source of cash for the Nearings, as it continues to be for many New England farmers today. This book is filled with a history of sugaring from Native American to modern times, with practical tips on how to sap trees, process sap, and market syrup. In an age of microchips and software that are obsolete before you can install them, maple sugaring is a process that's stood the test of time. Fifty years after its original publication in 1950, The Maple Sugar Book is as relevant as ever to the homestead or small-scale commercial practitioner.
Download or read book Sugarbush Management written by David R. Houston and published by . This book was released on 1989 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forest Fire Research written by Universidade de Coimbra and published by . This book was released on 2010 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt:
