Mathieu L.,555 Boul Of Luniversite |
Trepanier S.,Mines Virginia |
Daigneault R.,University of Quebec at Chicoutimi
Journal of Metamorphic Geology | Year: 2016
The CONSONORM_HG norm provides a standardized solution to approximate metamorphic assemblages for mid- to high-grade metamorphic rocks. Other applications for this norm include: (i) the standardized classification of metamorphic rocks; (ii) the interpretation of hydrothermal alteration using indices calculated from normative minerals; (iii) the estimation of the carbonate content of rocks, even when CO2 has not been analysed. CONSONORM_HG is designed for rocks dominated by silicates, Fe-Ti oxides or carbonates, and it approximates the main mineral assemblages of amphibolite, granulite, greenschist and blueschist facies metamorphic rocks. The norm calculates silicate assemblages using one of the three Al-Ca-NaK-FeMg tetrahedra, a convenient way of representing a large number of silicate assemblages, for each of the 17 P-T conditions modelled and based on the Fe-Mg-Mn composition of the sample. In addition to silicate minerals, CONSONORM_HG calculates Fe-Ti oxides and other accessory minerals from minor elements, sulphides from analysed sulphur and/or from analysed metals and also carbonates from analysed CO2 or from normative CO2 estimated from the loss on ignition. CONSONORM_HG also integrates many reactions to address silicon deficits, as well as quartz-carbonate reactions to approximate natural assemblages better. The normative calculation is validated using published whole-rock analyses and petrographic descriptions and its various applications are discussed. © 2016 John Wiley & Sons Ltd.
Dbouk M.,Lebanese University |
Mcheick H.,555 Boul Of Luniversite |
Sbeity I.,Lebanese University
Procedia Computer Science | Year: 2014
It's a big challenge to deal with security in a city. Teclmology advancements are influencing our life, cities are evolving, and modem cities are referring more and more to digital teclmologies. Currently, a huge amount of standalone independent-systems operate in the city, their goal is to satisfy some business activities, e.g. banking, customs, hospitals, etc. Data collected by these systems represents, if integrated, a key element in any decision making process. This paper presents a, working, smart collaborative platform to integrate multiple systems to serve the surveillance activities in a city or country. It consists of a collaborative surveillance system, called CityPro. The architecture that we propose is a future vision to protect people and monitor public infrastructures, such as bridges, roads, buildings, etc.; it is designed to deal with and!or prevent abnormal activities like terrorist attacks. CityPro is expected to operate in live-mode by using (intended to use) city adapted IT- infrastructures. At the end of this paper, a typical case study is given, and challenges and filture works are also discussed. © 2014 The Authors.
Ngoumfo R.M.,University of Yaounde I |
Ngoumfo R.M.,University of Gottingen |
Ngoumfo R.M.,University of Karachi |
Ngoumfo R.M.,University of Quebec at Montréal |
And 12 more authors.
Bioorganic and Medicinal Chemistry | Year: 2010
Chemical investigation of the roots and fruits of Zanthoxylum leprieurii Guill. et Perr. led to the isolation of three new alkaloids including two acridone derivatives, 3-hydroxy-1,4-dimethoxy-10-methyl-9-acridone (2) and 3-hydroxy-1,2-dimethoxy-10-methyl-9-acridone (3) named helebelicine A and B, respectively, and one secobenzo[c]phenantridine, 10-O-demethyl-12-O-methylarnottianamide (10), together with thirteen other compounds. The structures of compounds 2, 3 and 10 as well as those of the known compounds were elucidated by using spectroscopic methods and by comparison with reported data. The brine-shrimp (artemia salina) lethality bioassay of the chloroform extract of the fruits showed modest cytotoxicity with LD50 at 13.1 μg/mL. Isolated compounds 1, 4-6 were found to be moderately active against lung carcinoma cells (A549), colorectal adenocarcinoma cells (DLD-1) and normal cells (WS1) with IC50 values ranging from 27 to 77 μM. In contrast to the positive control etoposide used, the cytotoxicity of the most active compound 4 was found to be selective against cancer cells in comparison to normal cells WS1 with IC50 of 51 ± 8 μM and 4.3 ± 0.4 μM, respectively. © 2010 Elsevier Ltd. All rights reserved.
Madec C.,555 Boul Of Luniversite |
Walsh D.,555 Boul Of Luniversite |
Lord D.,555 Boul Of Luniversite |
Tremblay P.,555 Boul Of Luniversite |
And 2 more authors.
Northern Journal of Applied Forestry | Year: 2012
Black spruce-lichen woodlands (LW) are naturally occurring unproductive low tree density stands within the eastern North American closed-crown boreal forest. Natural reforestation in LWs is impeded by the lichen mat and ericaceous shrubs that inhibit seedling establishment. Disk scarification is a mechanical site preparation method that creates furrows where lichens and shrubs are removed and mineral soil is exposed, which is the preferred seedbed for black spruce natural regeneration. The objective of this study was to quantify the impact of disk scarification on black spruce establishment in LWs by natural seeding. Disk scarification was performed amid scattered seed trees in six study sites located in the central area of boreal Québec's spruce-moss bioclimatic domain. Newly established black spruce seedlings were significantly more abundant (ca. 81%; x2 = 28.72, P < 0.001) in the furrows of scarified plots even though the proportion of disturbed soil was small (ca. 20%). Seedling establishment occurred for at least 3 years following scarification, with a peak in the first year. The distribution and density of seed trees (112-363 stems ha-1) did not limit natural seedling establishment in this study. Five years after scarification, observed densities and stocking levels of newly established black spruce seedlings were sufficient to expect afforestation without planting in scarified LWs. Copyright © 2012 by the Society of American Foresters.