On Sussmann theorem for orbits of sets of vector fields on Banach manifolds

The purpose of this paper is to give some generalizations, in the context of Banach mani- folds, of Sussmann's results about the orbits of families of vector fields ([Su]). Essentially, we define the notion of "l1-orbits" for any family of vector fields on a Banach manifold, and we prove, under appropriate assumptions, that such an orbit is a weak Banach submanifold

Space life sciences strategic plan

Over the last three decades the Life Sciences Program has significantly contributed to NASA's manned and unmanned exploration of space, while acquiring new knowledge in the fields of space biology and medicine. The national and international events which have led to the development and revision of NASA strategy will significantly affect the future of life sciences programs both in scope and pace. This document serves as the basis for synthesizing the options to be pursued during the next decade, based on the decisions, evolution, and guiding principles of the National Space Policy. The strategies detailed in this document are fully supportive of the Life Sciences Advisory Subcommittee's 'A Rationale for the Life Sciences,' and the recent Aerospace Medicine Advisory Committee report entitled 'Strategic Considerations for Support of Humans in Space and Moon/Mars Exploration Missions.' Information contained within this document is intended for internal NASA planning and is subject to policy decisions and direction, and to budgets allocated to NASA's Life Sciences Program

Poset Matrix Structure Via Partial Composition Operations

This paper examines the structure of poset matrices by formulating a set of new construction rules for this purpose. In this direction, the technique of partial composition operations will be introduced as the basis for the recursive construction of poset matrices for any given size by extending the combinatorial setting of species of structures to poset matrices. More specifically, three new partial composition operation techniques that apply to poset matrices will be defined as the foundation for this study. Some key structural patterns arising from viewing poset matrices in terms of partial composition operations will be highlighted in the context of the formation of distinct poset matrices. The relevance of this study will set the basis for modeling the operad structure of poset matrices and their algorithmic enumeration

Does external debt promote economic growth in Côte d’Ivoire?

Thesis(Master) --KDI School:Master of Public Policy,2019The paper calls attention to the increasing external debt in Côte d’Ivoire. The primary goal of this paper was to cast light on the nature of the correlation between external debt and economic growth. I also attempted to identify the optimal level of debt stock that the country should hold for growth. The Autoregressive Distributive Lag (ARDL) bound test was performed to test for the presence of a cointegrating relationship between external debt and economic growth. I also employed the Hansen (2000) threshold test so as to confirm the presence of a threshold effect in external debt. The results suggest that external debt and economic growth are cointegrated. External debt significantly promoted growth in the longrun. The threshold test confirmed the presence of a threshold effect of external debt on economic growth, meaning that the Ivorian external debt and growth display a non-linear relationship. However, the number of observations did not allow the estimation of the threshold.INTRODUCTION CHAPTER 2: OVERVIEW OF DEBT AND GROWTH IN COTE D’IVOIRE CHAPTER 3: LITERATURE REVIEW CHAPTER 4: RESEARCH METHOD CHAPTER 5: RESULTS AND DISCUSSIONOutstandingmasterpublishedBoke Aime Arnauld TOAMA

L’action pédagogique à l’épreuve de l’individualisation du processus de production du savoir par les médias sociaux dans les universités au Bénin

Les médias sociaux sont aujourd’hui au cœur du processus de production du savoir dans les systèmes éducatifs et mettent ainsi à l’épreuve l’action pédagogique. Dans ce contexte, plusieurs stratégies sont mobilisées par les acteurs en vue de faire face aux nouveaux défis. La présente recherche vise à analyser l’influence de l’action pédagogique sur le processus de production du savoir par les médias sociaux dans les universités au Bénin. Dans le cadre de cette recherche qualitative, des données sont collectées auprès de 50 personnes ressources par le biais de l’entretien et l’observation à travers les techniques d’échantillonnage à choix raisonné et par boule de neige. Il apparait que les médias sociaux contribuent à l’individualisation du processus de production du savoir. De même, l’hyper-accessibilité des médias sociaux engendre une certaine démocratisation du savoir qui remet en cause l’action pédagogique traditionnelle. Il urge donc de relever le défi d’une pédagogie numérique. Social media is today at the heart of the knowledge production process in education systems and is therefore testing educational action. In this context, several strategies are mobilized by the actors in order to face the new challenges. This research aims to analyze the influence of educational action on the knowledge production process by social media in universities in Benin. As part of this qualitative research, data is collected from 50 resource persons through interview and observation through reasoned choice and snowball sampling techniques. It appears that social media contributes to the individualization of the knowledge production process. Likewise, the hyperaccessibility ofsocial media generates a certain democratization of knowledge and which calls into question traditional pedagogical action. It is therefore urgent to raise the level of a digital pedagogy

THE ROLE OF FRICTIONAL STRENGTH

[1] At a subduction zone the amount of friction between the incoming plate and the forearc is an important factor in controlling the dip angle of subduction and the structure of the forearc. In this paper, we investigate the role of the frictional strength of sediments and of the serpentinized peridotite on the evolution of convergent margins. In numerical models, we vary thickness of a serpentinized layer in the mantle wedge (15 to 25 km) and the frictional strength of both the sediments and serpentinized mantle (friction angle 1° to 15°, or static friction coefficient 0.017 to 0.27) to control the amount of frictional coupling between the plates. With plastic strain weakening in the lithosphere, our numerical models can attain stable subduction geometry over millions of years. We find that the frictional strength of the sediments and serpentinized peridotite exerts the largest control on the dip angle of the subduction interface at seismogenic depths. In the case of low sediment and serpentinite friction, the subduction interface has a shallow dip, while the subduction zone develops an accretionary prism, a broad forearc high, a deep forearc basin, and a shallow trench. In the high friction case, the subduction interface is steep, the trench is deeper, and the accretionary prism, forearc high and basin are all absent. The resultant free-air gravity and topographic signature of these subduction zone models are consistent with observations. We believe that the low-friction model produces a geometry and forearc structure similar to that of accretionary margins. Conversely, models with high friction angles in sediments and serpentinite develop characteristics of an erosional convergent margin. We find that the strength of the subduction interface is critical in controlling the amount of coupling at the seismogenic zone and perhaps ultimately the size of the largest earthquakes at subduction zones

Nonconventionalmesocaval prosthetic shunt interposition in refractory case with portal hypertension in a 10-kg female infant

Surgical treatment of portal hypertension in infants is challenging because of the high risk of shunt thrombosis. A 10-kg female infant underwent six failed procedures before being successfully treated by interposition of a 10-mm-diameter prosthetic graft between two 3-mm-diameter splanchnic veins and the inferior vena cava. Follow-up at 10 years demonstrates shunt patency and normal development without rebleeding. An aggressive surgical strategy is justified as long as even nonconventional techniques are available to prevent life-threatening complications of portal hypertension. Prosthetic grafts can be used when no autologous vein graft is available. Decellularized allografts with reduced immunogenicity may also be effective alternative materials.Keywords: mesocaval anastomosis, PHT, prosthetic shun

La productique en Ile-de-France. Innovations, recherche et transferts de technologie vers les PMI (1988)

L'étude propose de suivre un triple objectif : 1- Contribuer à l'inventaire et à l'évaluation des intervenants en productique dans la région francilienne, dans ses aspects tant quantitatifs que qualitatifs (industriels et laboratoires de recherche) ; 2- Evaluer la manière dont les tissus industriels franciliens sont pénétrés par la productique ; 3- Formuler des propositions, adressées notamment au Conseil Régional de l'Ile-de-France (IdF) pour une politique de développement de la productique.Cette étude a été réalisée dans le cadre de la convention de recherche du 2 février 1988 passée entre le Centre Régional d'Innovation et de Transfert Technologique en Mécanique d'Ile-de-France (CRITT MECA) et le Laboratoire de Recherche et d'Etude sur les Mutations Industrielles du Centre de Robotique Intégrée d'Ile-de-France (LAREMI/CRIIF – Ministère de la recherche) pendant le premier semestre de l'année 1988

Schématisation argumentative et co-élaboration de connaissances: le cas des interactions médiatisées par ordinateur

International audienceDans le cadre du projet européen SCALE (IST-1999) (Internet-based intelligent tool to Support Collaborative Argumentation-based Learning in secondary schools, http://www.euroscale.net), nous avons élaboré et étudié des situations d'apprentissage coopératif médiatisé par ordinateur au travers Internet. Il a s'agit de proposer une variété d'activités argumentatives — lecture et production de textes argumentatifs, élaboration de textes et schémas argumentatifs, interactions (ou débats) langagières et/ou schématiques — dans le but d'amener les élèves à élargir et à approfondir leurs connaissances d'un espace du débat particulier. Par la notion de « l'espace du débat », nous entendons l'espace cognitifsémiotique partagé, co-construit par les élèves au cours de leurs interactions argumentatives, en référence à une question débattue (Baker, Quignard, Lund & Séjourné, 2003 ; Quignard, Baker, Lund & Séjourné, 2003). Ce travail a conduit à la production d'outils de recherche permettant une analyse fine des processus interactifs d'élaboration des connaissances en relation avec des activités argumentatives