Search results for "Compact"
showing 10 items of 531 documents
Mg/Ca ratios in coralline algae record northwest Atlantic temperature variations and North Atlantic Oscillation relationships
2010
Climate variability in the North Atlantic has been linked in part to the North Atlantic Oscillation (NAO). The NAO influences marine ecosystems in the northwestern Atlantic and transport variability of the cold Labrador Current. Understanding historic patterns of NAO variability requires long‐term and high‐resolution climate records that are not available from instrumental data. Here we present the first century‐scale proxy record of sea surface temperature (SST) variability from the Newfoundland shelf, a region from which other annual‐resolution shallow marine proxies are unavailable. The 116 year record was obtained from three sites along the eastern Newfoundland shelf using laser ablatio…
Influences of atomization process and precursor material on the compaction mechanisms and metallurgical properties of parts developed by HIP
2022
Hot Isostatic pressing process is based on the densification of metals powders to near net shape parts with higher mechanicals properties than forged chemical equivalent. The precursor material can influence the parts properties. Thus the aims of this these is to understand the influence of the powder properties on the HIP parts. The particles characterization and the elements and compound monitoring during the HIP cycle allowed to understand the different oxidations phenomenons and their impact on the mechanical properties of parts. The comparison of differents powders batches with identical particles size repartition or identical chemical composition showed that the chemical composition a…
Evaluación etnobotanica de la Yareta (Azorella compacta) en Arequipa (Perú) y sus posibles aplicaciones
2013
Abstract – Ethnobotanical study of the Yareta Arequipa plant (Azorella compacta Phil) and its possible applications. – The aim of this work is the ethnobotanical characterisation of the Yareta Arequipa plant (Azorella compacta Phil), to report indications about the uses of the Yareata plant by “Salinas y Aguada Blanca” National Reserve (RNSAB) populations and to find its possible applications. The survey has been lead on nine communities of the Arequipa Region (Peru), it concerned the actual degree of conservation of the plants, the botanical description and classification, the ecological characterization, the use and the distribution in ethnomedicine and ethnopharmacology and all the uses …
Azorella compacta (Yareta):an endemic plant of the Andean planteaux in South America. Azorella compacta (Yareta): pianta endemica degli altipiani and…
2013
Azorella compacta (Yareta): pianta endemica degli altipiani andini del Sud America. – Si riportano i risultati di una ricerca sugli usi della Azorella compacta Phil da parte delle popolazioni sudamericane del Perù, Argentina, Cile e Bolivia, allo scopo di realizzare una documentazione etnobotanica di partenza per possibili applicazioni pratiche della pianta. La sperimentazione sulla A. compacta ha preso in esame lo stato attuale di conservazione, la classificazione e descrizione botanica, l’ecologia, la distribuzione, l’utilizzazione in etnomedicina e etnofarmacologia e altre possibili impieghi. Dalla suddetta esperienza è emerso che tutte le comunità in studio,dei suddetti Paesi, utilizzan…
Bitumen stabilized ballast: a potential solution for railway track-bed
2016
Railway ballast degradation under dynamic loads progressively leads to loss of mechanical performance and geometry of the track, so that maintenance interventions are frequently needed. In order to system- atically avoid this issue, recently solutions have been proposed to reinforce track-bed by using polyur- ethane and/or resins as well as asphalt layers among others. Nonetheless, their main limitations are related to the high initial cost and low productivity. To cope with these limitations, in this study, bitumen stabilized ballast (BSB) is proposed as a new solu- tion for ballast stabilization. This method aims at improving durability and reducing settlement by mod- ifying both stiffnes…
Long-term optical variability of high-mass X-ray binaries. II. Spectroscopy
2016
We present the results of our monitoring program to study the long-term variability of the Halpha line in high-mass X-ray binaries. We have carried out the most complete optical spectroscopic study of the global properties of high-mass X-ray binaries so far with the analysis of more than 1100 spectra of 20 sources. Our aim is to characterise the optical variability timescales and study the interaction between the neutron star and the accreting material. Our results can be summarised as follows: i) we find that Be/X-ray binaries with narrow orbits are more variable than systems with long orbital periods, ii) we show that a Keplerian distribution of the gas particles provides a good descripti…
PINCoC: a Co-Clustering based Method to Analyze Protein-Protein Interaction Networks
2007
Anovel technique to search for functionalmodules in a protein-protein interaction network is presented. The network is represented by the adjacency matrix associated with the undirected graph modelling it. The algorithm introduces the concept of quality of a sub-matrix of the adjacency matrix, and applies a greedy search technique for finding local optimal solutions made of dense submatrices containing the maximum number of ones. An initial random solution, constituted by a single protein, is evolved to search for a locally optimal solution by adding/removing connected proteins that best contribute to improve the quality function. Experimental evaluations carried out on Saccaromyces Cerevis…
The NHXM observatory
2011
Exploration of the X-ray sky has established X-ray astronomy as a fundamental astrophysical discipline. While our knowledge of the sky below 10 keV has increased dramatically (∼8 orders of magnitude) by use of grazing incidence optics, we still await a similar improvement above 10 keV, where to date only collimated instruments have been used. Also ripe for exploration is the field of X-ray polarimetry, an unused fundamental tool to understand the physics and morphology of X-ray sources. Here we present a novel mission, the New Hard X-ray Mission (NHXM) that brings together for the first time simultaneous high-sensitivity, hard-X-ray imaging, broadband spectroscopy and polarimetry. NHXM will…
Essential norm estimates for composition operators on BMOA
2013
Abstract We provide two function-theoretic estimates for the essential norm of a composition operator C φ acting on the space BMOA; one in terms of the n-th power φ n of the symbol φ and one which involves the Nevanlinna counting function. We also show that if the symbol φ is univalent, then the essential norm of C φ is comparable to its essential norm on the Bloch space.
Phenotype/Genotype Relationship in Left Ventricular Noncompaction: Ion Channel Gene Mutations Are Associated With Preserved Left Ventricular Systolic…
2021
International audience; Background: Few data exist concerning genotype-phenotype relationships in left ventricular noncompaction (LVNC).Methods and results: From a multicenter French Registry, we report the genetic and clinical spectrum of 95 patients with LVNC, and their genotype-phenotype relationship. Among the 95 LVNC, 45 had at least 1 mutation, including 14 cases of mutation in ion channel genes. In a complementary analysis including 16 additional patients with ion channel gene mutations, for a total of 30 patients with ion channel gene mutation, we found that those patients had higher median LV ejection fraction (60% vs 40%; P < .001) and more biventricular noncompaction (53.1% vs 18…