Materials Literature
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The aim of the investigations was to measure the influence of Fe 3+ ion on jack bean urease (JBU) activity. Interaction between Fe 3+ and JBU, is examined using isothermal titration calorimetry. It was found that Fe 3+ ions acted as a non-cooperative inhibitor of JBU, and there is a set of 12 identical and independent…
The polycrystalline Zn-doped CuAlO2 ceramics were obtained by solid state reaction method. The mixture of high purity grade of CuO, Al2O3 and Zn (CH3COO)22H2O powders was ground and then pressed by using uniaxial pressure. The obtained pellet was sintered in air at 1,150 °C for 24 h. XRD patterns showed the crystal st…
The molten carbonate fuel cell (MCFC) is an important research field of the new energy generation equipment, and is a difficulty in the research field of high-temperature fuel cells at present. To aim at the MCFC modeling problem, the MCFC electrochemical mechanism process was analyzed firstly, then the MCFC modeling…
Local control of ZnO nanorods growing was realized through applying different external electric-fields on three-electrode microstructure with top coplanar cathode and anode in pair and a bottom gate. The site-selective growth of ZnO nanorods consists of DC method and AC method. In DC control method, under proper DC vo…
Phase field equations for simulation of dendritic growth have a history of nearly twenty years. The existing phase field equations are directly derived through the Ginzburg-Landau equations. However, though widely used, the physical meaning of each variable in the equations is not clear. So the domestic and foreign re…
In this paper, the reliability and degradation mechanisms of high-brightness LEDs were studied, which were prepared by Cree and currently available on the market. Results revealed that operating currents had an important effect on the service performance of treated LEDs. Only at 350mA the tested LEDs had a good perfor…
Silica filled HNBR compounds were prepared, and modified with 2 different silanes, namely, mercapto silane (TESPT) and vinyl silane (VTEO). Because the HNBR was cured with peroxide, the 2 coagents (TRIM and ZDA) were used simultaneously as a hybrid system for a purpose of cure efficiency enhancement. Various compositi…
Electrochemical double layer capacitor is a new technology for the storage of electrical energy. Electrical energy storage will be a critical issue in many renewable energy systems. Electrochemical double layer capacitor technology along with fuel cell or battery can address many issues related to effective electrical…
Hot compression tests of 7075 extruded bar were carried out on the Gleeble-1500 thermal simulation machine at strain rates of 0.1 s-1 and 1s-1 and at temperatures of 320°C. The compression direction are aligned at 0°, 45°and 90°to the axis direction of the extruded bar. Microstructure and texture was characterized usi…
This paper presents the experimental results of a study of how temperature affects the luminescence of molecular clusters of silver in photothermorefractive glasses. It is shown that, after the glasses are UV-irradiated in the absorption band of cerium ions, intense and broad-band luminescence appears in the visible r…
Data from investigating the formation of nanoparticles (NPs) on a surface of silicon wafers after zinc ion implantation and thermal annealing are presented. The investigation is conducted by means of trans-mission electron microscopy, electron diffraction analysis, energy dispersive microanalysis, scanning tunneling m…
본 연구는 높은 압력으로 체결되어 있는 고분자전해질연료전지(PEMFC) 스택의 구성부품중 가장 크게 변형되는 가스확산층(GDL)의 공극률과 기체투과율의 변화를 제시하였다. 압축하중에 따른 체적변화를 실험을 통하여 측정하고 기존에 제시된 관계식을 이용하여 공극률과 기체투과율의 변화을 예측하였다. 또한 물의 배출을 향상시키기 위하여 첨가되는 PTFE 가 압축상태의 GDL 의 공극률과 기체투과율에 미치는 영향을 연구하였다. 물질전달에 직접 영향을 미치는 기체투과율은 PTFE 가 많이 포함된 GDL에서 급격하게 감소하였다. 결과적으로 같은 압축하중으로 체결하는 경우 GDL…
This paper presents the investigation results of the electrochemical behavior of copper in 1 M Na2CO3 solution in the presence of potassium ethyl xanthate (KEtX) with different concentrations. Tests were conducted on copper samples obtained without deformation and with deformation of 83, 91 and 99 %. Samples were obta…
The sunlight activated photocatalysts are urgently needed for the applications of photocatalytic techniques to environmental pollutants removal. Herein, we report the one-step hydrothermally prepared CdS/TiO2 nanocomposite photocatalyst that is active in the degradation of pollutant organic dyes under solar light. The…
The gallium and indium double-modified bismuth scandate-lead titanate (1-x)Bi (In0.20Ga0.05Sc0.75)O3-xPbTiO3((1-x)BIGS-xPT,x=0.55-0.70) ceramics were prepared by using conventional ceramic technique. (1-x)BIGS-xPT ceramics for nearx=0.60 exhibits an evident enhancement in room temperature dielectric and piezoelectric…
Teak wood is widely used for the housing interior and decoration because of its beautiful grains appearance; however, it often suffers from surface damage especially in the tiling application. The remedy is to apply a protective layer such as polyurethane (PU). In this work, the sol-gel inorganic reinforced hard coati…
In this paper, we investigate various surface structures of oxygen adsorption on Pd doping Zn-terminated ZnO (0001) by DFT. The results show that oxygen atom prefers to be adsorbed on the H sites of Pd substituting Zn atom of first Zn-O bilayers. The calculated PDOS indicates that a stronger interaction between adsorb…
We have succeeded in doping Fe at the Al site in the intermediate valence and quantum critical material β -YbAlB 4 up to 6%. Our measurements of the magnetization and the specific heat for β -YbAl 0.94 Fe 0.06 B 4 show magnetic ordering at 10 K. The antiferromagnetic Weiss temperature of 88 K, which is smaller than th…
Accelerator consumption was analyzed by electrochemical method. As the presence of SPS and PEG in the acidic cupric sulfate solution with chloride ions, the cathodic polarization curves become have peaks and valleys. The peak and valley have a strong association with the additive concentration and are associated with…
Adjustable carrier concentration is an attractive feature of semiconductor nanoparticle that allows its surface plasmon resonance to be tuned. While quasi-static treatment of the electromagnetic interactions with the charge species can account for the polarization process in a conductive nanoparticle, a full-wave solu…