Analyse 3D de microstructures de graines en microtomographie par rayons X

Analyse 3D de microstructures de graines en microtomographie par rayons X

ADAPTABILITY OF APPLE VARIETES TO FUNGAL DISEASES AND PHYSIOLOGICAL DISORDERS, DEPENDING ON THE STORAGE TECHNOLOGY APPLIED

A special feature of apple fruits is that they can be kept for a longer period of time. However, during storage, the fruits are affected by certain diseases, which can cause considerable losses. As a result of research, it has been established that the technology used is one of the main factors in the storage period, able to regulate the intensity of ripening senescence processes in apple fruits, and as a result their degree of resistance to fungal diseases and physiological disorders. Fitomag has had a significant influence not only on the fruit ripening process, but also on the quality and resistance to fungal diseases and physiological disorders. The investigated fruits had an attractive appearance, high firmness, juiciness and a more pleasant taste, compared to the control fruits. The storage technology by post-harvest application of Fitomag can compete with that of storage under controlled atmosphere (AC) conditions, the advantages of the researched preparation being: simplicity in application, low electricity consumption during storage and minimal equipment investments

A comparative study of austenitic structure in NiTi and Fe based shape memory alloys after severe plastic deformation

The effect of high speed high pressure torsion (HS-HPT) was studied in NiTi and FeMnSiCr SMAs, by comparison. Severe plastic deformation was performed in austenite state for both types of alloys. The alloys subjected to HS-HPT, reduced their grain size due to microstructure fragmentation by compression and torsion. The active elements were achieved being able to support variable ranges of processing parameters like force, pressure, rotation speed and time of torsion. The evolution of microstructural refinement in the samples subjected to different deformation by HS-HPT, were studied by optical and scanning electron microscopy observation and the thermal effect was reveled using differential scanning calorimetry (DSC). (C) 2015 The Authors. Published by Elsevier Ltd.publishersversionpublishe

On the value of graph-based segmentation for the analysis of structural networks in life sciences

We propose, under the form of a short overview, to stress the interest of graph to encode the "topological" structure of networks hidden in images especially when applied in life sciences. We point toward existing computer science tools to extract such structural graph from images. We then illustrate different applications, such as segmentation, denoising, and simulation on practical examples of various bioimaging domains including vascular networks observed with fluorescent microscopy in 2D imaging, macroscopic root systems observed in 2D optical intensity imaging, and 3D porosity networks of seed observed in absorption X-ray microtomography

Dynamic Evaluation of Traffic Noise through Standard and Multifractal Models

Traffic microsimulation models use the movement of individual driver-vehicle-units (DVUs) and their interactions, which allows a detailed estimation of the traffic noise using Common Noise Assessment Methods (CNOSSOS). The Dynamic Traffic Noise Assessment (DTNA) methodology is applied to real traffic situations, then compared to on-field noise levels from measurement campaigns. This makes it possible to determine the influence of certain local traffic factors on the evaluation of noise. The pattern of distribution of vehicles along the avenue is related to the logic of traffic light control. The analysis of the inter-cycles noise variability during the simulation and measurement time shows no influence from local factors on the prediction of the dynamic traffic noise assessment tool based on CNOSSOS. A multifractal approach of acoustic waves propagation and the source behaviors in the traffic area are implemented. The novelty of the approach also comes from the multifractal model's freedom which allows the simulation, through the fractality degree, of various behaviors of the acoustic waves. The mathematical backbone of the model is developed on Cayley-Klein-type absolute geometries, implying harmonic mappings between the usual space and the Lobacevsky plane in a Poincare metric. The isomorphism of two groups of SL(2R) type showcases joint invariant functions that allow associations of pulsations-velocities manifolds typ

Comparative Characteristics of Martensite and Bainite in Cu-Based SMAs

The present work reports the evolution of micro-structure and shape memory behavior in a Cu-15 Zn-6 Al (mass. %) shape memory alloy (SMA), as a function of the applied hot working procedure and of the performed heat treatments. To this purpose a special compressed-air forging hammer was employed. The samples were heated up to 1023 K into an electric furnace and swaged on a compressed-air forging hammer, by multiple blows. After several blows, the specimens were prepared, by maintaining the main plastic deformation direction, for structural analysis, being cut, embedded, ground, polished and etched. Structural analysis comprised optical (OM) and scanning electron (SEM) microscopy observations, performed with the view of emphasizing the morphological aspects of martensite and bainite. To reveal the atomic fluctuations, enabled by hot forging, energy dispersive X-ray spectroscopy analysis (EDS) measurements were performed by means of SEM analysis. The paper reports the results of OM, SEM and EDS observations, by corroborating the results obtained in martensite and bainite