Search results for "grain"
showing 10 items of 752 documents
Characterizing Low-Permeable Granitic Rock from Micrometer to Centimeter Scale: X-ray Microcomputed Tomography, Confocal Laser Scanning Microscopy an…
2006
AbstractFirst results of combining X-ray microcomputer tomography (µCT), confocal laser-scanning microscopy (CLSM) and 14C-polymethylmethacrylate (14C-PMMA) impregnation techniques in the study of granitic rock samples are reported. Combining results of µCT and CLSM with those of the 14C-PMMA technique, the mineral-specific porosity and morphology of the open pore space, as well as its connectivity, could be analyzed from a micrometer up to a decimeter scale.Three different types of granite were studied. In two cases part of the micro-fissure and pore apertures were found to be in a micrometer scale, but in one case all grain-boundary openings were below the detection limit. Micrometer-scal…
Cross-cultural differences in consumer quality perception of rice
2014
International audience; Most aspects of food product quality perception are culture-bound. We present a cross-cultural study aiming at understandinghow consumers from four countries (French, Japanese, Korean and Thai) perceive, describe and appreciate rice and ricequality. Marked differences were found in participants' motivation to consume rice: sensory and commodity in France; sensoryand health in Japan; nutrition and commodity in Thailand; and nutrition, health and safety in Korea. For the description of ricequalities, despite a few cultural differences, especially between Korean and Thai descriptions of white and brown rice samples,similar sensory profiles were obtained in the four coun…
Characterisation of Physical and Biochemical Traits of Hulless Spring Barley Grain in the Latvian Breeding Programme
2013
Abstract Incorporation of whole grain, such as hulless barley, as a part of a balanced diet can help reduce the risk of coronary heart diseases, diabetes and specific cancers, and provide other health benefits as well. The objectives of this study were to determine the physical and chemical characteristics of grains of hulless barley genotypes from the Latvian spring barley programme. Field experiments were carried out in 2010-2011 at the State Stende Cereal Breeding Institute. Grain samples of 29 hulless spring barley breeding lines were analysed for grain physical traits (1000 kernel weight, test weight), macronutrients (crude protein, starch, β -glucans), and micronutrients (total phenol…
Understanding and Controlling Food Protein Structure and Function in Foods: Perspectives from Experiments and Computer Simulations
2020
The structure and interactions of proteins play a critical role in determining the quality attributes of many foods, beverages, and pharmaceutical products. Incorporating a multiscale understanding of the structure–function relationships of proteins can provide greater insight into, and control of, the relevant processes at play. Combining data from experimental measurements, human sensory panels, and computer simulations through machine learning allows the construction of statistical models relating nanoscale properties of proteins to the physicochemical properties, physiological outcomes, and tastes of foods. This review highlights several examples of advanced computer simulations at mol…
Tailoring of the electronic properties of ZnO-polyacrylonitrile nanofibers: Experiment and theory
2017
Abstract We report the study of ZnO-polyacrylonitrile (ZnO-PAN) nanofibers fabricated by the combination of electrospinning and atomic layer deposition. The latter technique enables us to control the size of the surface of ZnO 1D nanostructures and hence its effectiveness for energy and biosensor applications. We observe the tendency of ZnO to form nanograins with increase of the layer thickness, and investigate the influence of the grain size on the electronic properties of the nanofibers. It is demonstrated that the ZnO work function (Φ) is strongly affected by surface band bending in the ZnO layer. The observed change of Φ in ZnO layers results from the curvature of the grain surface as …
Template electrosyntesis of CeO2 nanotubes
2007
Nanotube arrays of CeO2 were produced in a single step by potentiostatic electrochemical deposition from a non-aqueous electrolyte, using anodic alumina membrane templates. The CeO2 nanotubes showed a polycrystalline structure, and they were assembled in the membrane nanochannels. The nanotubes had somewhat uniform diameters, with an average external value of about 210 nm, and a maximum length of about 60 µm; the latter parameter was controlled by the electrodeposition time. Each single nanotube was found to consist of crystalline grains having a size of about 3 nm. Raman analysis shows that these CeO2 nanotubes are suitable for catalytic applications.
Effect of Reaction Parameters on Composition and Morphology of Titanate Nanomaterials
2009
International audience; In the present article, we report the synthesis of titanate nanotubes and nanoribbons with controlled morphology, structure, and chemical composition depending on the main parameters of the synthesis. Hydrothermal processing time, grain size of the precursor, type of agitation, and acid treatment were investigated, and the principal controversies mentioned in the literature such as nanotube crystallographic structure, their chemical composition, and acid treatment impact are discussed. These controversies may be due to the heterogeneities present in all the samples and are rarely considered in the literature. These nanostructures were characterized by Raman spectrosc…
New-onset headache following COVID-19: An Italian multicentre case series
2023
Objective: To describe the characteristics of patients with new-onset headache following SARS-CoV-2 infection. Background: SARS-CoV-2 infection leads to several neurological manifestations, and headache is a frequent and disabling symptom, both exacerbating pre-existing headache syndromes and causing new-onset ones. Methods: Patients with new-onset headache after SARS-CoV-2 infection with consent to participate were included, while those ones with previous headaches were excluded. The temporal latency of headache after infection, pain characteristics, and concomitant symptoms were analysed. Moreover, the efficacy of acute and preventive medications was explored. Results: Eleven females (med…
Tritium localisation and release from the ceramic pebbles of breeder
2004
Magnetic field (MF) effects on the radiolysis and tritium release from Li4SiO4 (FZK) and Li2TiO3 (CEA) ceramic pebbles were investigated. The tritium chemical forms in Li4SiO4 were estimated by means of lyomethods. In the case of the neutron fluence Fn 6 10 18 nm � 2 , the tritium is mostly in the T þ form, but in the case of Fn � 10 25 nm � 2 , the T þ form accounts for 86–95% of the tritium. A high subsurface concentration of tritium is characteristic of a separate pebble and correlates with the distribution of radiation-induced defects. The MF increases the radiolysis of Li4SiO4 by 20–25%. Irradiation with electrons to 1000 MGy at 1200 K increases the grain size by 5–10%, decreasing the …
Ab initio simulations of oxygen interaction with surfaces and interfaces in uranium mononitride
2012
Abstract The results of DFT supercell calculations of oxygen behavior upon the UN (0 0 1) and (1 1 0) surfaces as well as at the tilt grain boundary are presented. Oxygen adsorption, migration, incorporation into the surface N vacancies on (0 0 1) and (1 1 0) surfaces have been modeled using 2D slabs of different thicknesses and supercell sizes. The temperature dependences of the N vacancy formation energies and oxygen incorporation energies are calculated. We demonstrate that O atoms easily penetrate into UN surfaces and grain boundaries containing N vacancies, due to negative incorporation energies and a small energy barrier. The Gibbs free energies of N vacancy formation and O atom incor…