Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We construct a one-dimensional model for the stepped leader in the filamental discharge by simplifying an electric-circuit model of discharge. We find that the leader of the discharge moves stepwise by direct numerical simulations, and then we try to understand the mechanism of the stepwise motion by reducing the spat…
Bismuth selenide is both a thermoelectric material and topological insulator. Defects and dopants create conduction in thermoelectric applications. However, such defects may degrade the performance as a topological insulator (TI). Magnetic impurities such as iron open a band gap at the Dirac point on the surface. Sinc…
With an eye on plasma walls we investigate, within an effective model for the two active electrons involved in the process, secondary electron emission due to Auger de-excitation of metastable nitrogen $N_2(^3σ^+_u)$ molecules at metallic surfaces. Modelling bound and unbound molecular states by a LCAO approach and a…
We are interested to study the Kondo effect present in a system with a T-shape ligation between the single-wall carbon nanotube (SWNT) and a magnetic impurity. The system has studied under pressure and it was observed the opening of the gap in the density of states of the zigzag metallic tube. A tight-binding approxim…
Almost all the polymer crystals have several polymorphic modifications. Their structure and existence conditions, as well as transitions between them are not understood even in the case of the 'model' polymer polyethylene (PE). For analysis of polymorphism in polymer crystals, we consider the simplest possible model o…
This chapter contains sections titled: Sample Test Answers
We study the optical properties of small gold chains doped with different transition metal (TM) atoms (Ni,Rh,Fe) by using the time-dependent density-functional theory (TDDFT) approach. The optical absorption spectrum of such systems demonstrates a collective plasmon mode when the number of atoms is larger than approxi…
In order to establish a biobased economy, an integrated analysis of what is technically viable, economically feasible and socially desirable is mandatory.The drive to this economy will be the Biorefineriesindustrial complexes, where processes and equipment convert biomass into biofuels, energy and chemicals.The Brazil…
We analyze by the finite element method transient deformations of a helmet mounted on a Roma Plastilina #1 clay-filled rigid and stationary headform. The helmet is made of a unidirectional fiber reinforced composite that is modeled as a linear elastic orthotropic material. Hashin's criteria are used to simulate the fi…
The overall aim of this project was to study the reutilisation of the major ash components, predominantly silica and potassium, in wheat straw combustion residues to form alkali silicate binders for novel inorganic composite boards. Wheat straw of one variety and year was studied in detail on a lab-scale. Studies on t…
This contribution covers important developments published in 2010 on the photochemical and photocatalytic properties of transition-metal compounds. The emphasis is on photoactive molecular-based systems of interest in the following major area: photoreactivity and applications in synthesis; water splitting; biomimetic…
Trabajo presentado en el International RILEM Conference on Advances in Construction Materials Through Science and Engineering, celebrado en Hong Kong (China), del 5 al 7 de septiembre
A micellar catalyzed oxidation of pentaamminecobalt(III) complexes of α‐amino acids by Mn(III)acetate in acidic medium yielding nearly 100% Co(II) and about 100% carbonyl compounds are ultimate products. The unbound amino acids yield about 100% of carbonyl compound in presence of micelles. The effect of variation of s…
Superlattices have been a fruitful approach for enhancing the figure of merit, ZT, of thermoelectric materials. Generally, superlattice transport is measured either parallel or perpendicular to the superlattice planes. We show here that the figure of merit is a function of carrier propagation angle in the superlattice…
International audience
The Franco-German consortium "DINaFil" (Dynamics at the Interface of Nanoscopic Fillers), located at Paris, Lyon and Halle, and co-funded by the ANR and the DFG, is a multidisciplinary endeavour concerned with a quantitative understanding of the complex behaviour of filled elastomers, a class of daily-life materials w…
In this work we demonstrate the potential of using an automated cell viability analyzer for developing high-throughput screening of orthopedic bioactive materials. We used a biomaterial of carbon nanotubes (CNTs)-based composite integrated with hydroxyapatite/polymethyl methacrylate (HA/PMMA) with controlled physical…
New Salicylate derivatives of organoheterobimetallic‐μ‐oxoisopropoxide [Bu2SnO2Ti2(OPri)6] have been synthesized by the thermal condensation of μ‐oxoisopropoxide compound with different salicylates in different molar ratios (1:1‐1:4) yielded the compounds of the type [Bu2SnO2Ti2(OPri)6-n(RSal)n] (where n is 1‐4 and RS…
Synthetic carbon allotrope chemistry is currently among the most rapidly growing topics in materials chemistry. The youngest and at the same time probably the most promising representative of new carbon allotropes is graphene. In this article we outline our recent contributions to chemical graphene formation and funct…
Abstract : A systematic method is presented for determining the shape and rise of an underwater explosion bubble. The water is assumed to be incompressible and unbounded, and the pressure is assumed to be uniform throughout the bubble at all times. The bubble is assumed to be initially spherical. The velocity of the f…