Materials Literature
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Some features of spectral and non-linear optical properties of ZnS quantum dots stabilized by high-molecular polyvinylpyrrolidone have been studied. It is shown that the absorption spectra of ZnS composite materials (sols, coatings) in UV spectral region are determined by quantum confinement effect, exhibiting the dep…
The homoepitaxial growth of diamond on single crystal substrates is done using microwave plasma-assisted chemical vapor deposition with a hydrogen-methane plasma. The doping of the deposited diamond with boron makes it a p-type semiconductor and with phosphorus makes it an n-type semiconductor. The doping of diamond i…
Various mechanical and chemical pretreatment methods including alkali treatment, pre-beating, enzyme treatment and oxidation treatment have been used to reduce the production energy of the microfibrillated cellulose (MFC). Among them, alkali swelling can be helpful to reduce the energy consumption because the internal…
We have experimentally studied saturation behavior of Single-Walled Carbon Nanotube-based saturable absorbers at different temperatures and SWCNT concentrations in the carboxymetylcellulose polymer matrix and related it to the mode-locked erbium-doped fiber laser performance.
In this work a method for the laser formation of C-Au-Ag clusters and complexes on the surface of an optically transparent media is discussed.
In this study, experiments and finite element method analysis were used to determine the autofrettage pressure that is optimal and then maximizes the cycling life of Type3 composite cylinders used in self-contained breathing apparatus. For both approaches, the cylinders were pressurized at 100, 110, ..., 290 % of the…
This paper presents distractive features of hysteresis voltage control for voltage source inverters. The features of the creation of the hysteresis voltage control systems for electric power systems are considered. The possibility of applying of hysteresis voltage control for multilevel voltage source inverters is eva…
본 연구에서는 UV 광을 이용하여 CO, C₂H 5 OH 및 H₂S에 해당하는 오염물질을 제어하기 위한 광촉매 연구를 수행하였다. 제조된 촉매들이 동일한 체적 및 표면적의 경우에는 촉매 구조 내부까지 UV 광이 조사될 수 있는 구조에서 우수한 반응활성을 보였다. 하지만 이러한 광촉매 TiO₂의 CO에 대한 반응활성은 매우 저조하였으며, 이는 귀금속 계열의 Pt를 첨가하여 환원공정을 수행함으로써 해결할 수 있다. 특히 이러한 Pt/TiO₂ 광촉매는 환원공정을 통하여 표면 Pt 0 의 종의 생성 및 증가시킬 수 있으며, 이를 통해 CO의 반응활성이 우수해 짐을 확인하였…
코크에 의한 촉매의 불활성화는 산업현장에서 촉매가 사용되는 동안 매우 중요하다. 본 연구에서는 프로판 탈수소 반응을 위한 Pt-Sn 촉매에서 반응조건인 수소의 비율이 코크생성에 미치는 영향과 코크버닝에 의한 촉매 활성의 회복여부, 그리고 코크양에 따른 코크버닝 중의 백금소결여부, Pt-Sn-K 촉매에서 Sn의 함량이 코크생성과 불활성화에 미치는 영향을 확인하고자 하였다. Pt-Sn-K는 Pt와 Sn, K를 순차적으로 각각 θ-알루미나와 γ-알루미나에 담지 하여 제조하였다. 프로판 탈수소 반응은 먼저 반응물중의 수소비를 달리하여 620 ℃에서 수행한 후, 코크버닝을…
Aluminum oxide sputtering process is widely used in gas barrier coating for flexible display manufacturing because of its high deposition rate and high step coverage. The deposition layer is often affected by target poisoning because the target conditions are changed, as well, by reactive gases during the initial stag…
Electrodynamic characteristics of double-row periodic systems which are formed by metal bar gratings of rectangular cross-section under their excitation by dielectric waveguide disposed along their longitudinal axis are described. The possibility of effective adjustment of the power level of emitted harmonics and of o…
Summary form only given. Laser ablation of metals has numerous applications, ranging from material processing to spacecraft propulsion. The impacting laser generates a plasma plume in front of a surface that expands into vacuum or a background medium. Different effects within the expanding plume are responsible for ch…
Summary form only given. The remediation of NOx emission from diesel exhaust or gas turbines has been widely studied for atmospheric pollution and human health. In order to reduce exhaust gases, non-thermal atmospheric plasmas, Selective Catalytic Reduction(SCR), and SCR with plasma technology have been use. SCR with…
International audience
Electromagnetic characteristics of composites based on nanopowders of M-type hexaferrite were investigated. Powders of hexaferrite were obtained by by SHS synthesis. Electromagnetic characteristics of synthesized materials are such as electromagnetic characteristics of obtained by ceramic technology.
We experimentally observe phase-matched second harmonic generation under Bragg diffraction in the Laue geometry in one-dimensional porous silica based photonic crystals infiltrated by a ferroelectric salt.
This reports examines the feasibility of converting the existing Wabash Integrated Gasification Combined Cycle (IGCC) plant into a liquid fuel facility, with the goal of maximizing jet fuel production. The fuels produced are required to be in compliance with Section 526 of the Energy Independence and Security Act of 2…
Summary form only given. We study the inception of positive streamer discharges from a sharp dielectric body in a sub-breakdown electric field on the basis of the Meek criterion. The criterion is widely used in the high voltage technology where discharges are to be avoided. We take into account the high non-uniformity…
Summary form only given. The paper focuses on numerical simulation of mixing of plasma chemical species under extreme temperature and density gradients in the arc discharge with hybrid stabilization of an electric arc by axial argon flow and tangential water vortex (hybrid-stabilized arc). This arc is being used at pr…
O presente trabalho visa investigar e caracterizar a liga amorfa Co72Nb24B4 na oxidação catalítica\ndo metanol em produtos intermediários, tais como o formaldeído e outros. A técnica para obter as liga\namorfa foi por forno de fundição de arco elétrico. O catalisador de liga amorfa Co72Nb24B4 foi caracterizado\npor DR…