Materials Literature
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Free-space optical communication systems operate with very limited field of view and in narrow spectral regions, leading to relatively simple optical designs. Operation in the space environment, however, imposes severe environmental requirements. Typically mounted on the exterior of a spacecraft, the optical component…
As a new two-dimensional material, graphene has been applied in various devices due to its unique electrical and optical properties. In this work, a reconfigurable Yagi antenna by using graphene’s tunable conductivity is proposed. The Yagi antenna consists of one feed element and four elements which are located on eit…
This paper presents the research achievements for the optomechanical metamaterials and metasurfaces in our group at the past several years. Firstly, the analysis for mechanical motion under the electromagnetic (EM) wave excitation of a metamaterial unit cell is developed, and the interaction between the EM wave and me…
In this work, we present a high aperture efficiency wideband True-Time-Delay transmitarray antenna based on coding metasurface. For wideband aperture coupling antenna, the True-Time-Delay(TTD) compensation method can obtain better performance than the phase compensation method, including gain, aperture efficiency and…
The necessary components to reduce the wide Angle beam scanning antenna, leaky wave antenna scanning Angle at the same time maximize the cycle, reduce the cost of materials, this paper find a new kind of liquid crystal materials, application on the design of liquid crystal planar periodic leaky wave antenna. The anten…
we proposed a planar terahertz metasurfaces composed of asymmetric split rings resonators on polyimide substrate. Simulation results show that three resonances are observed in the transmission spectrum, and stronger toroidal dipole resonances are obtained at 0.29 THz and 1.25THz. The electromagnetic characteristics wo…
In this paper, the propagation properties of the vortex beam carrying orbital angular momentum (OAM) with ground are analyzed. When the vortex electromagnetic wave propagate in the real environment the reflected electromagnetic waves from the ground can affect the propagation and reception of the vortex beams. A unifo…
An electronically reconfigurable transmitarray element designed in Ku band is presented. The proposed element using two orthogonally coupling slots structure with two PIN diodes, can be electronically controlled to generate two phase states with 180° phase difference and low transmission loss. The metal vias are added…
The paper deals with design of hydrogen separator from synthesis gas produced in plasma reactor by municipal waste treatment. The system uses metal hydride alloys, in particular La0,85Ce0,15Ni5with a storage capacity of 1.43%, to separate hydrogen from the synthesis gas. The design consists of the design of the heatin…
Переклад міжнародних стандартів ISO розглянуто як окремий, особливий вид науково-технічного перекладу. У роботі досліджено структуру міжнародного стандарту “Energy audits – requirements with guidance for use” та його перекладу українською мовою національного стандарту «Енергетичні аудити. Вимоги та настанова щодо їх п…
The properties needed for aircraft tire treads are significantly different from the ones required for passenger car or truck tires, for which improvements mainly focus on a better balance of rolling, wet skid and wear resistance. Aircraft tires experience severe operation conditions during service: The temperature can…
Abstract The hazard testing on each chemicals which are continuously synthesized is too much task to meet the rapid industrial development. Currently,...
Abstract Six-membered ring heterocyclic compounds are widely present in the Earth's surface environments as biological organic molecules composed of soil organic matter including plant and microbial residues, while little is known about their effect on the dissolution of silicate minerals including amorphous silica. T…
Lithium-ion batteries have been widely used in various industries because of their high energy density, long life cycle, and green ring. In recent years, with the rapid development of consumer electronics, mobile wearable devices, and especially electric vehicles, the energy density requirements of the lithium-ion bat…
International audience
In the high-intensity focused ultrasound (HIFU) surgery, there is a problem of poor therapeutic efficacy due to the inevitable depth-dependent decline in ultrasound energy along the ultrasound pathway. In order to address this issue, the article provides a strategy for a six-way synthetic HIFU therapy system aiming to…
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Provides an assessment of additional estimated losses of electricity in power systems cranes in river ports. The cause of additional calculated power losses is the use of step load graphs instead of the original graphs as the initial information. Clarification of the calculated power losses is achieved by taking into…
The purpose of the research was to obtain hydrophilic and biocompatible polymeric materials. The obtained bionanocomposites were investigated in terms of biocompatibility by using a fibroblast cell line (NCTC clone L929), water contact angle measurements, morphology (by SEM measurements) and structural composition (by…
In this contribution we present an approach towards programmable shape memory transformations utilizing the intrinsic physical properties of a ternary polymer-based composite. The underlying idea is to use an open porous elastic skeleton as the base, where the pores are filled with a component that can alter its elast…