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。
Atomic force microscopy and nanoindentation have been applied to the study of thin molecularly templated polymer films. The template was chosen to be the readily hydrogen‐bonded cotinine molecule and three different polymer hosts, Elvamide® nylon, Nylon‐6, and poly(4‐vinylphenol) were compared. The host polymer was sh…
A reflectarray antenna with a metamaterial (MM) absorber is presented to improve a front-back ratio by reducing a backlobe level. The presented reflectarray antenna is composed of a feed horn, a square patch reflectarray and a MM absorber which is based on a spilt-ring-cross resonator configuration. The improvement of…
The purpose of the present work is the implementation of a four layer structure composed of mixtures with single-walled carbon nanotubes at different weight percentages (1, 3, 15, 20%) for minimizing the Reflection Coefficient of incident waves. The presence of a supporting PEC layer is also considered. A combination…
This work discusses the theoretical definition and practical application of different approaches to metamaterial homogenization. The categorization of the various approaches is based on the final objective of the homogenization procedure, i.e. on the specific metamaterial behavior that is required to be mimicked by th…
Tungsten–bronze polycrystalline ceramic Li2Pb2Dy2W2Ti4V4O30 was prepared by mixed-oxide method. The preparation conditions were optimized by thermogravimetry analysis and repeated firing. Room-temperature structural analysis confirms the formation of the compound in single phase (orthorhombic). Studies of dielectric p…
International audience
The need to control thermal emissions in devices, such as infrared (IR) sensors, has a number of defense and security applications. By tuning the geometry and material properties of core-shell particles, we will illustrate how they can be designed to control IR emissions, i.e., electromagnetic waves in the 8-12 μm ran…
The aim of this work is to study dielectric properties of thin carbon nanotube layers at 75-110 GHz frequency range with S-parameter measurements of loaded sapphire rod waveguides. The results are compared with DC resistivity, high frequency resistivity, optical transparency and free-space transmission of MMW radiatio…
This work presents a theory of metasurface transformation which extends Transformation Optics to control the wavefront of surface waves (SW) through the use of modulated metasurfaces. As the outputs of the conventional TO approach are the metamaterial constitutive parameters able to perform a certain modification of t…
Metasurfaces are thin metamaterial layers characterized by unusual reflection properties of plane waves and/or dispersion properties of surface/guided wave. Metasurfaces can be described through a surface impedance boundary condition; the impedance, possibly tensorial, can vary from place to place (by design) on the s…
New emissions certification requirements for medium duty vehicles (MDV) meeting chassis dynamometer regulations in the 8,500 lb to 14,000 lb weight classes as well as heavy duty (HD) engine dynamometer certified applications in both the under 14,000 lb and over 14,000 lb weight classes employing large diameter exhaust…
Chara strigosa is reported from several lakes in Poland. The finds were published by Izabella Dąmbska in 1966, but have not been recognised internationally, presumably because Dąmbska's article was published in a local paper in Polish. We give a short description of Charetum strigosa first described by Dąmbska. One of…
This paper presents the numerical validation of the impact response of a hot formed B-pillar component with tailored properties. A laboratory-scale B-pillar tool is considered with integral heating and cooling sections in an effort to locally control the cooling rate of an austenitized blank, thereby producing a part…
The spin polarized two dimensional electron gas in the correlated ABO3/SrTiO3 (A = Pr, Nd and B = Al, Ga) heterostructures is investigated by ab-initio calculations using density functional theory. Structural relaxation shows a strong buckling at and near the TiO2 terminated n-type interface (IFs) due to significant T…
In this article, we introduce a new metamaterial complementary electric LC resonator (CELC) and investigate its operational mechanism, characteristics, and potentialities for application in microwave components and devices, such as filters. We consider the excitation of CELC by the electric and magnetic fields of micr…
Self-emulsifying drug delivery system (SEDDS) is successfully used to improve the aqueous solubility and oral bioavailability of the poorly aqueous soluble drugs. Atorvastatin calcium (ATV), a poorly aqueous soluble drug having low oral bioavailability, was the model drug for this study. The aim of this study was to f…
Creep, fatigue, oxidation, or their combinations are usually the fundamental underlying material degradation and failure mechanisms in advanced engines, manifolds, thermal regeneration systems, and other systems. Therefore, the basic understanding and appropriate mathematical modeling of these mechanisms are crucial i…
Abstract We observed crossed transitions and anti‐Stokes emissions in single quantum‐dot‐like objects embedded in the active layer of InGaN/GaN quantum disks by two‐photon absorption techniques. We proposed a phenomenological model based on the interplay between Auger effect and crossed transitions to explain the orig…
This study exploits the surface equivalence principle to obtain a reduced system of equations for a problem that includes doubly periodic infinite arrays of multi-layers of core-shell nanoparticles, illuminated by a plane wave, above a dielectric substrate. The proposed approach allows a different host medium for each…
There is a broad range of material choices for on-road and off-road exhaust systems. The final selection of the materials depends on the balance of engineering performance of the materials and the cost. Thermal-cycling resistance of exhaust materials is an extremely important criterion for the long-term durability and…