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Search Results: 1 - 10 of 191527 matches for " D. Marchand "
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Effect of localized oil spills on Atlantic loggerhead population dynamics  [PDF]
Margaret-Rose Leung, Melissa Marchand, Samantha Stykel, My Huynh, José D. Flores
Open Journal of Ecology (OJE) , 2012, DOI: 10.4236/oje.2012.23013
Abstract: The purpose of this study is to analyze the population dynamics of loggerhead sea turtles (Caretta caretta) affected by localized oil spills. Methods include development of a spatial, stage-classified matrix model parameterized for the following primary loggerhead populations: Gulf of Mexico, western North Atlantic Ocean, and Florida peninsula. Oil spills are simulated deterministically in each population's nesting region, with 1) oil-induced mortality ranging from 25% to 100% and 2) stage classes affected either proportionally or equally. A transient sensitivity analysis was performed to determine the parameters most influential to the population growth rate. Results suggest that increased protection and understanding of young sea turtles found in the Sargasso Sea is essential to the survival of the species. In addition, findings provide insights into the population dynamics of the At- lantic loggerhead turtles and identify conservation measures appropriate in each oil spill case.
A Cognitive Behavioural Intervention for the Treatment of Vasovagal and Unexplained Syncope  [PDF]
France Bedard, Andre Marchand, Teresa Kus, Bernard Thibault, Bianca D’Antono
International Journal of Clinical Medicine (IJCM) , 2014, DOI: 10.4236/ijcm.2014.510080

Vasovagal syncope and unexplained syncope are the most commonly observed types of syncope in outpatient and hospital settings. Medical interventions usually target at the physiological mechanisms responsible for loss of consciousness in an attempt to limit the frequency of recurrences. However, this type of intervention does not take into account the psychological and functional impact of syncope, nor the importance of psychological variables in triggering and maintaining syncope. In the present pilot study, four participants presenting significant psychological distress and recurrent syncope were treated using a multimodal intervention targeting at both the medical and psychological aspects of the problem. Results showed a significant reduction in the frequency of syncope/presyncope, in the level of emotional distress experienced, as well as improved functional status in three of the four participants. Several recommendations are made to medical practitioners and psychologists, in view of identifying patients likely to benefit from this type of intervention or components thereof.

Lattice model for the surface states of a topological insulator with applications to magnetic and exciton instabilities
D. J. J. Marchand,M. Franz
Physics , 2012, DOI: 10.1103/PhysRevB.86.155146
Abstract: A surface of a strong topological insulator (STI) is characterized by an odd number of linearly dispersing gapless electronic surface states. It is well known that such a surface cannot be described by an effective two-dimensional lattice model (without breaking the time-reversal symmetry), which often hampers theoretical efforts to quantitatively understand some of the properties of such surfaces, including the effect of strong disorder, interactions and various symmetry-breaking instabilities. Here we formulate a lattice model that can be used to describe a {\em pair} of STI surfaces and has an odd number of Dirac fermion states with wavefunctions localized on each surface. The Hamiltonian consists of two planar tight-binding models with spin-orbit coupling, representing the two surfaces, weakly coupled by terms that remove the extra Dirac points from the low-energy spectrum. We illustrate the utility of this model by studying the magnetic and exciton instabilities of the STI surface state driven by short-range repulsive interactions and show that this leads to results that are consistent with calculations based on the continuum model as well as three-dimensional lattice models. We expect the model introduced in this work to be widely applicable to studies of surface phenomena in STIs.
Simplified Transient Hot-Wire Method for Effective Thermal Conductivity Measurement in Geo Materials: Microstructure and Saturation Effect
B. Merckx,P. Dudoignon,J. P. Garnier,D. Marchand
Advances in Civil Engineering , 2012, DOI: 10.1155/2012/625395
Abstract: The thermal conductivity measurement by a simplified transient hot-wire technique is applied to geomaterials in order to show the relationships which can exist between effective thermal conductivity, texture, and moisture of the materials. After a validation of the used “one hot-wire” technique in water, toluene, and glass-bead assemblages, the investigations were performed (1) in glass-bead assemblages of different diameters in dried, water, and acetone-saturated states in order to observe the role of grain sizes and saturation on the effective thermal conductivity, (2) in a compacted earth brick at different moisture states, and (3) in a lime-hemp concrete during 110 days following its manufacture. The lime-hemp concrete allows the measurements during the setting, desiccation and carbonation steps. The recorded diagrams allow the calculation of one effective thermal conductivity in the continuous and homogeneous fluids and two effective thermal conductivities in the heterogeneous solids. The first one measured in the short time acquisitions (<1?s) mainly depends on the contact between the wire and grains and thus microtexture and hydrated state of the material. The second one, measured for longer time acquisitions, characterizes the mean effective thermal conductivity of the material. 1. Introduction The thermal and hydric transfers in geomaterials are fundamental phenomena which can govern firstly the comfort in buildings and residences and secondly the durability of the materials. The microclimatic simulations of the hygrometric and thermal conditions prevailing in the building interiors need the estimation of the wall material characteristics: moisture and effective thermal conductivity face to the outer climatic changes. In fact, the thermal and hydric conductivities are intrinsic properties of the materials. The heat transfers mainly depend on the frequency of grain contacts, size of pores, and air-water ratio infilling the porosity. The moisture transfers mainly depend on the connectivity associated to the meso-to-micro porosity distribution. The development and implementation of “ecomaterials” for building have to demonstrate their ecologic qualities both by their productions and building techniques and also by their thermal and hydric insulation properties. In this “ecomaterial” domain, the earth material and concretes using plant fibers as aggregates are more and more used. Their uses are governed by their mechanical and thermal properties, that is, minimum of mechanical resistance face to the construction necessities and insulation or heat
Giant proximity effect in a phase-fluctuating superconductor
D. Marchand,L. Covaci,M. Berciu,M. Franz
Physics , 2007, DOI: 10.1103/PhysRevLett.101.097004
Abstract: When a tunneling barrier between two superconductors is formed by a normal material that would be a superconductor in the absence of phase fluctuations, the resulting Josephson effect can undergo an enormous enhancement. We establish this novel proximity effect by a general argument as well as a numerical simulation and argue that it may underlie recent experimental observations of the giant proximity effect between two cuprate superconductors separated by a barrier made of the same material rendered normal by severe underdoping.
Self-organized topological state in the magnetic chain on the surface of a superconductor
I. Reis,D. J. J. Marchand,M. Franz
Physics , 2014, DOI: 10.1103/PhysRevB.90.085124
Abstract: Electronic states associated with a chain of magnetic adatoms on the surface of an ordinary s- wave superconductor have been shown theoretically to form a one dimensional topological phase with unpaired Majorana fermions bound to its ends. In a simple 1D effective model the system exhibits an interesting self-organization property: the pitch of the spiral formed by the adatom magnetic moments tends to adjust itself so that electronically the chain remains in the topological phase whenever such a state is physically accessible. Here we examine the physics underlying this self-organization property in the framework of a more realistic 2D model of a superconducting surface coupled to a 1D chain of magnetic adatoms. Treating both the superconducting order and the magnetic moments selfconsistently we find that the system retains its self-organization property, even if the topological phase extends over a somewhat smaller portion of the phase diagram compared to the 1D model. We also study the effect of imperfections and find that, once established, the topological phase survives moderate levels of disorder.
Alcohol use and misuse: What are the contributions of occupation and work organization conditions?
Alain Marchand
BMC Public Health , 2008, DOI: 10.1186/1471-2458-8-333
Abstract: Data come from a representative sample of 10,155 workers in Quebec, Canada. Multinomial regression models corrected for sample design effect have been used to predict low-risk and high-risk drinking compared to non-drinkers. The contribution of occupation and work organization conditions (skill used, decision authority, physical and psychological demands, hours worked, irregular work schedule, harassment, unionization, job insecurity, performance pay, prestige) have been adjusted for family situation, social network outside the workplace, and individual characteristics.Compared to non-qualified blue-collars, both low-risk and high-risk drinking are associated with qualified blue-collars, semi-qualified white-collars, and middle managers; high-risk drinking is associated with upper managers. For constraints-resources related to work organization conditions, only workplace harassment is an important determinant of both low-risk and high-risk drinking, but it is modestly moderated by occupation. Family situation, social support outside work, and personal characteristics of individuals are also associated with alcohol use and misuse. Non-work factors mediated/suppressed the role of occupation and work organization conditions.Occupation and workplace harassment are important factors associated with alcohol use and misuse. The results support the theoretical model conceptualizing alcohol use and misuse as being the product of stress caused by constraints and resources brought to bear simultaneously by agent personality, structures of daily life, and macro social structures. Occupational alcohol researchers must expand their theoretical perspectives to avoid erroneous conclusions about the specific role of the workplace.Alcohol misuse afflicts a substantial part of the working population. In the USA, 6.2% of adults working full-time reported heavy drinking in 1999 [1]. In Canada, 22% to 33% of employees exceeded the Canadian low-risk alcohol guidelines, 7% to 8% were episo
Em torno do pensamento pós-formal
Análise Psicológica , 2002,
Abstract: thirty years after the emergence of the most important theories about post-formal thought, there still remain various questions about the nature of such thought. this article will seek, first, to succinctly describe what is understood by the term post-formal thought, and, second, to analyze some questions that are raised about the nature of this level of thought.
The Specific Differences Between ApantesisNais Drury, A. Vittata Fabr. And A.Phalerata Harris
Werner Marchand
Psyche , 1917, DOI: 10.1155/1917/48751
First account of a Thermotropism in anopheles Punctipennis, WithBionomic Observations
Werner Marchand
Psyche , 1918, DOI: 10.1155/1918/74810
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