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。
High-quality ceramics were synthesized on the basis of Bi1 − x A x FeO3 (A = La, Nd; 0.00 ≤ x ≤ 0.20) solid solutions. Their crystal and grain structure, Mössbauer spectra, and other dielectric and magnetic characteristics were studied. It was shown that an increase in the content of A elements in the studied samples…
Abstract Thiol‐functionalized meso‐structured silicas have been prepared by the co‐condensation of tetraethoxysilane and 3‐mercaptopropyltrimethoxysilane in the presence of an amphiphilic block copolymer (EO) 45 ‐ b ‐(MA) 53 . Partial S‐alkylation of mercapto groups with 9‐(chloromethyl)anthracene resulted in the form…
Abstract The crystal structure of Gd(CO 3 )OH was solved using synchrotron powder X‐ray diffraction. Gd(CO 3 )OH was known to exist in a form Gd 2 O(CO 3 ) 2 ·H 2 O and its powder pattern has been listed in JCPDF (#430604) for decades, but the crystal structure has not yet been elucidated. The crystal structure is sol…
The 3D problem of scattering by a grating consisting of coaxial impedance bodies of revolution is solved with the help of the modified null field method. A system of integral equations is derived, and numerical results are obtained for the scalar and vector formulations of the problem.
Small calibre (〈6mm) polytetrafluoroethylene (PTFE) bypass grafts have poor medium and long term patency due to the development of neointimal hyperplasia at the distal anastomosis. The inelasticity of PTFE is implicated in this mechanism of failure. We have developed a novel polyhedral oligomeric silsesquioxane (POSS)…
This paper puts forward and discusses the prospects of carbon based nanomaterials (including carbon nanotubes and graphene nano-ribbons) for designing next generation low-power, low-loss and ultra energy-efficient “green” electronics targeted for computing as well as energy storage and conversion applications.
Ion implantation technique is used to study the magnetic properties of Cu-doped ZnO. The room temperature ferromagnetism in the Cu-implanted ZnO samples is observed. From the photoluminescence spectrum of implanted samples we observe a broad green emission around 510 nm, which is related to defects in the samples. X-r…
In thin-film silicon solar cells, a flexible optical design for light collection is developed that can lead to zero reflection loss and enhance the optical path length in the absorber layer. In this work, we demonstrate two-filling-factor asymmetric binary gratings on the top of the solar cells and metallic diffractio…
The influence of the temperature of the primary heat treatment in the case of two-stage heat treatment of glasses on the kinetics of precipitation of PbS nanocrystals and the structure of the glass-ceramic materials prepared has been investigated. The main structural parameters of the glass-ceramic material, such as t…
Abstract Glycerol is a byproduct of biodiesel synthesis by transesterification of triglycerides with short-chain alcohols in the presence of solid base catalysts. Because hydrotalcite is a potentially useful basic catalyst for the transesterification reaction, the interaction of glycerol with hydrotalcite is the focus…
Pure nano- Fe 3 O 4 and cobalt-doped nano- Fe 3 O 4 particles are successfully synthesized by co-precipitation method using tetramethylammonium hydroxide (TMAOH) as alkali. Several key factors that may affect preparation are carefully discussed such as alkali concentration, alkali dosage, reaction temperature, iron sa…
A new type of states in graphene-based planar heterojunctions has been studied in the envelope wave function approximation. The condition for the formation of these states is the intersection between the dispersion curves of graphene and its gap modification. This type of states can also occur in smooth graphene-based…
A new scheme for broadband terahertz modulation based on periodic arrays of subwavelength metallic slits is presented. By using this scheme, we demonstrate low loss terahertz modulation with 100% modulation index over a broad modulation bandwidth of more than 0.2THz.
Abstract Combustion behavior of cigarette paper containing different content of combustion improver was investigated in order to provide direct experiment data to elucidate lower components in cigarette smoke caused by combustion improver in cigarette paper. The content of the combustion improver was denoted as "organ…
Effects of ground magnesium limestone (GML) and gypsum on the properties of Ultisols at two sites, involving a corn groundnut rotation, were studied over 24 months. GML or gypsum was incorporated into the soils of the Bungor and Rengam Series (Typic Paleudults), at the rates of 0, 0.5, 1.0, 2.0, 4.0, and 8.01 ha to de…
Abstract Cellulose was benzylated starting from the dissolved polymer in dimethyl sulfoxide (DMSO)/tetrabutylammonium fluoride trihydrate (TBAF) and heterogeneously in aqueous NaOH as reaction media. Differences in the distribution of benzyl moieties within the anhydroglucose unit in dependence on the synthesis pathwa…
The dielectric response (permittivity and losses) of epitaxial CoFe2O4–BaTiO3 thin film nanocomposites deposited under different conditions has been measured. Exhaustive microstructural analyses have allowed tracking the evolution of structure and morphology as a function of thickness, deposition temperature and rate.…
Phase-change memories (PCMs) are an important emerging non-volatile memory technology that uses amorphous and crystalline cell states to store data. The cell states are switched using high temperatures. As the semi-stable states of PCM cells are sensitive to temperatures, scaling down cell sizes can bring significant…
A battery-extender fuel cell auxiliary power unit (BE-APU) is the first step in a far-reaching and long-term vision that Boeing has for utilizing fuel cells as APUs on board commercial airplanes for greater energy efficiency and improved air quality at airports. A critical requirement for developing a commercially via…
The composition of the products of destruction of a poly(styrene) film at the edge and inside the electric breakdown channel has been investigated using Raman spectroscopy. It has been demonstrated that, apart from the compounds with double carbon-carbon bonds, the breakdown initiates the formation of aromatic cycles…