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Search Results: 1 - 10 of 448340 matches for " J. L. Genicot "
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The Use of Microcontrollers by Scientists in Experimental Research Applications  [PDF]
J. L. Genicot
World Journal of Nuclear Science and Technology (WJNST) , 2015, DOI: 10.4236/wjnst.2015.51003
Abstract: If the microcontrollers are devices quite easy to use for experts in electronics, a scientist devoted to different research topics from digital electronics is generally totally unable to develop and use these complex components. Most of the time, the researcher is looking for simple devices able to control different parameters during his experimentation. He is obliged in this case to request the intervention of an expert in electronics to develop such a device and the result is sometimes different from the precise initial requirement. Nowadays, it is possible to find on the market, simple units able to satisfy the requirements of the scientist and easy enough to be manipulated by him in specific applications. The purpose of this paper is to present some of these devices and to compare their possibilities and the ways to use them. These devices are compared in optically stimulated dosimetry with applications found in external dosimetry, interventional radiology, nuclear medicine and space dosimetry.
Discovery of a novel iota carrageenan sulfatase isolated from the marine bacterium Pseudoalteromonas carrageenovora
Sabine M. Genicot,lène Rogniaux,Laurence Meslet-Cladière,Tristan Barbeyron,William Helbert
Frontiers in Chemistry , 2014, DOI: 10.3389/fchem.2014.00067
Abstract: Carrageenans are sulfated polysaccharides extracted from the cell wall of some marine red algae. These polysaccharides are widely used as gelling, stabilizing, and viscosifying agents in the food and pharmaceutical industries. Since the rheological properties of these polysaccharides depend on their sulfate content, we screened several isolated marine bacteria for carrageenan specific sulfatase activity, in the aim of developing enzymatic bioconversion of carrageenans. As a result of the screening, an iota-carrageenan sulfatase was detected in the cell-free lysate of the marine bacterium Pseudoalteromonas carrageenovora strain PscT. It was purified through Phenyl Sepharose and Diethylaminoethyl Sepharose chromatography. The pure enzyme, Psc ι-CgsA, was characterized. It had a molecular weight of 115.9 kDaltons and exhibited an optimal activity/stability at pH ~8.3 and at 40 ± 5°C. It was inactivated by phenylmethylsulfonyl fluoride but not by ethylene diamine tetraacetic acid. Psc ι-CgsA specifically catalyzes the hydrolysis of the 4-S sulfate of iota-carrageenan. The purified enzyme could transform iota-carrageenan into hybrid iota-/alpha- or pure alpha-carrageenan under controlled conditions. The gene encoding Psc ι-CgsA, a protein of 1038 amino acids, was cloned into Escherichia coli, and the sequence analysis revealed that Psc ι-CgsA has more than 90% sequence identity with a putative uncharacterized protein Q3IKL4 from the marine strain Pseudoalteromonas haloplanktis TAC 125, but besides this did not share any homology to characterized sulfatases. Phylogenetic studies show that P. carrageenovora sulfatase thus represents the first characterized member of a new sulfatase family, with a C-terminal domain having strong similarity with the superfamily of amidohydrolases, highlighting the still unexplored diversity of marine polysaccharide modifying enzymes.
External and Environmental Radiation Dosimetry with Optically Stimulated Luminescent Detection Device Developed at the SCK.CEN  [PDF]
Reinhard Boons, Mark Van Iersel, Jean Louis Genicot
World Journal of Nuclear Science and Technology (WJNST) , 2012, DOI: 10.4236/wjnst.2012.21002
Abstract: The laboratory of Radiation Dosimetry and Calibration of the Belgian Nuclear Research Centre (SCK.CEN) is using thermoluminescence dosimetry for more than thirty years for routine measurements and for R&D investigations. In 2002, it has developed an experimental device based on the optically stimulated luminescence (OSL) technique. This device is working with AL2O3:C crystals stimulated by the green line (488 nm) emitted by a 150 mW argon laser. This paper describes this device, its characteristics, some applications in space dosimetry and the R&D works initiated in this field during the next few years.
Direct Determination of Radionuclides in the Body Optimisation of Measurements Parameters and Results Analysis  [PDF]
Jean Louis Genicot, Telma Fonseca, Gary Kramer, André Wambersie
World Journal of Nuclear Science and Technology (WJNST) , 2011, DOI: 10.4236/wjnst.2011.13013
Abstract: Whole body counting (WBC) benefits from new types of detectors and methodologies. It has found applications in areas such as in medicine, protection of workers and of population. The design of a WBC facility should be tailored to the type of application. Monte Carlo calculations help to improve the reliability of the calibration of a facility, particularly for non-standard measurements (child, etc.), help in optimizing shielding of counting rooms, preventing large systematic errors and lowering detection limits. In vivo counting may be used to evaluate the distribution of radionuclides in organs for metabolic studies with multiple detectors or with a scan of the body. Reduction of detection levels by background reduction is limited. Improved sensitivity can be obtained by adapting the detector type and size to the measured photon energy. The benefit of comparison exercises and training courses are demonstrated. Further improvements in accuracy can be expected from cooperative works with other techniques: indirect methods (urines and faeces) and passive detectors placed correctly on the body can in the case of high levels of contamination can be used to improve the burden assessment.
Probabilistic Verification over GF(2m) Using Mod2-OBDDs  [PDF]
J.L. Imana
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.22012
Abstract: Formal verification is fundamental in many phases of digital systems design. The most successful verification procedures employ Ordered Binary Decision Diagrams (OBDDs) as canonical representation for both Boolean circuit specifications and logic designs, but these methods require a large amount of memory and time. Due to these limitations, several models of Decision Diagrams have been studied and other verification techniques have been proposed. In this paper, we have used probabilistic verification with Galois (or finite) field GF(2m) modifying the CUDD package for the computation of signatures in classical OBDDs, and for the construction of Mod2-OBDDs (also known as ?-OBDDs). Mod2-OBDDs have been constructed with a two-level layer of ?-nodes using a positive Davio expansion (pDE) for a given variable. The sizes of the Mod2-OBDDs obtained with our method are lower than the Mod2-OBDDs sizes obtained with other similar methods.
Empirical Analysis of Factors Affecting the E-Book Adoption—Research Agenda  [PDF]
J. K. L. Poon
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.25011
Abstract: Advances in information technology encourage the development of e-books. The 2010 Horizon Report predicts that e-book will be one of the six technologies most likely to affect higher education in coming years. Despite the huge investment in developing the e-book market, customer take-up over the past decades is still far below expectations. The success of e-book adoption depends on the implementation of an educational model that addresses learner needs as well as content relevance. To understand customer behavior intention in adopting e-books and to address the lack of holistic approach in adoption research, this project is proposed to investigate the intention of college students in using e-books. This cross-sectional research utilizes the Technology Acceptance Model (TAM) and four additional variables, namely, personal innovativeness of information technology, social influences, perceived costs, and environmental consciousness. The study is expected to contribute to the literature by providing an empirically validated extended TAM regarding e-books. Moreover, the results will provide important and useful information for academicians and publishers.
Preservation of Minority Languages in North America: French Immersion Programs in the Province of Alberta  [PDF]
Baltasar J. López Ruiz
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.34012
Abstract: Canada, which was officially declared a bilingual nation after the proclamation of the Official Language Act (1969), counts with a low percentage of French speaking population who hardly reaches a quarter of the total population. We must add the fact that there is a very little fraction of the population who speaks French outside the province of Quebec. Social, cultural and ethnic realities which are present within the Canadian territories enable us to observe and investigate the diversity of identities and the different linguistic assimilation processes experienced by non Anglophone citizens. Facts seem to indicate that the francophone minority groups, living in areas of the country where the most spoken language is different from their mother tongue, struggle for the preservation of their cultural heritage at the same time that keep alive their Canadian identity. The possibility of contrasting the situation of the Francophones in Western Canada with the reality of other minority groups which represent a similar percentage with respect to the total population—such as the Germans and the Ukrainian origin citizens—constitutes a valuable resource in order to predict the evolution of the demographic patterns and the use of French as a heritage language within the Canadian territories. The present work reviews the diverse political, linguistic and demographic contexts that may support our idea that using an additional language—French and English in the case of most Francophones in Western Canada—represents an advantage from a cognitive, social and linguistic point of view. The high degree of acceptance of the francophone schools and the popularity of the French immersion programs set up by Albertan authorities are considered within this article in order to support this hypothesis.
Arbeidsverhoudingebestuur
J. J. L. Coetzee
South African Journal of Industrial Psychology , 1990, DOI: 10.4102/sajip.v16i2.503
Abstract: Managing Industrial Relations in South Africa is inderdaad in velerlei opsigte 'n indrukwekkende publikasie.
Carryover Effect of Imidazolinone Herbicides for Crops Following Rice  [PDF]
L. O. Santos, J. J. O. Pinto, L. B. Piveta, J. A. Noldin, L. Galon, G. Concen?o
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.58117
Abstract:

We aimed with this study to evaluate the effects of residual activity in soil of formulated mixtures of the herbicides imazethapyr + imazapic and imazapyr + imazapic on ryegrass and on rice cultivars, IRGA 424 and BRS Querencia. Two experiments were conducted under greenhouse in randomized blocks design with four replications in split-plot and split-split-plot designs, respectively for the first (E1) and second (E2) experiments. For E1, main plots allocated herbicides (imazethapyr + imazapic and imazapyr + imazapic), and subplots the doses [(0, 0.5, 1.0, 1.5 and 2.0 fold the label dose of imazethapyr + imazapic (1 L·ha-1) and imazapyr + imazapic (140 g·ha

GPS- vs. DEM-Derived Elevation Estimates from a Hardwood Dominated Forest Watershed  [PDF]
L. Chris Kiser, J. Michael Kelly
Journal of Geographic Information System (JGIS) , 2010, DOI: 10.4236/jgis.2010.23021
Abstract: Topographic attributes are often used as explanatory variables when providing spatial estimates of various environmental attribute response variables. Elevation of sampling locations can be derived from global positioning systems (GPS) or digital elevation models (DEM). Given the potential for differences in elevation among these two data sources, especially in response to forest canopy cover, our objective was to compare GPS and DEM-derived elevation values during the dormant season. A non-parametric Wilcoxon test indicated GPS elevation was higher than DEM elevation with a mean difference of 6 m. Linear regression analysis indicated that GPS and DEM elevation were well correlated (R2 = 0.71, r = 0.84, p < 0.0001). Although elevation among the two data sources differed, the strong linear relationship allows for correction of elevation values in a predictable manner.
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