Materials Literature
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Bacillus licheniformis로 부터 phospholipase D (PLD)로 추정되는 유전자를 PCR 기술을 이용하여 분리하여 pGEM-T easy 운반체에 cloning 하였다. 분리된 유전자는 His6가 붙은 pET-21 운반체를 이용하여 E. coli BL21 (DE3)에서 발현시켰다. 재 조합된 PLD는 nikel-nitrilotriacetic acid (Ni-NTA) resin을 갖는 column을 이용하여 affinity chromatography로 분리하였다. SDS-PAGE 분석 결과 PLD로 추정되는 단백질은 약 44 kDa의 주요 단일…
This study continues previous work on off-stoichiometric Fe-Pd alloys using a combined reaction strategy during thermomechanical processing [1,2]. Severe plastic deformation of the initial disordered fcc gamma phase (γ) of compostion Fe-35at.%Pd, followed by heat treatment in the two phase field produces a nano-compos…
Sensing characteristics of amperometric NOx sensor using yttria-stabilized zirconia (YSZ) and La-based perovskite-type oxide sensing-electrode (SE) was examined. La 0.8 Sr 0.2 MO 3 (M = Co, Mn, Fe) and LaMnO 3 was synthesized by means of spray pyrolysis method. The sensor attached with La 0.8 Sr 0.2 MnO 3 as a SE show…
Introduction The development of polymer/clay nanocomposites as commercial materials faces the problem of limited miscibility of inorganic hydrophilic layered silicates and organic hydrophobic polymers. Intensive studies have led to various strategies, including the use of surface-active organic compounds, chemical mod…
The catalytic activity of faujasite type NaY catalysts prepared from local clay (kaolin) with different Si/Al ratio was studied using cumene cracking as a model for catalytic cracking process in the temperature range of 450-525° C, weight hourly space velocity (WHSV) of 5-20 h1, particle size ≤75μm and atmospheric pre…
The theoretical and experimental investigations of electrical properties of the Al-SiO₂-( − ncsSi -SiO₂-Si structures grown using high temperature annealing SiOx, x < 2, have been carried out. It has been experimentally found that the Al-SiO₂-( − ncsSi )-SiO₂-Si structures with the tunnel dielectric layer revealed the…
Resistance to surface electrical discharge was investigated for epoxy alumina and epoxy silica nanocomposites. Epoxy alumina nanocomposites with 0.1, 1, 5, 10 and 15 wt% nanoalumina fillers as well as epoxy silica nanocomposites with 0.1, 1 and 5 wt% nanosilica fillers were prepared in the laboratory using direct disp…
A few KDP (KH₂PO₄) and KDP:Ca²⁺ (CaCl₂) single crystals were grown \nbased on the temperature reduction method. Investigations show that the presence of \nbivalent ions like Ca²⁺ could be a cause of retarded growth rate and induced crystalline \nlattice defects. Here the pure KDP crystals are compared with KDP:CaCl₂.…
Composites of Fe-C60 and Al C60 produced by mechanical milling and sinterized by Spark Plasma Sintering are investigated with special attention to the mechanical properties of the products. The processing involves phase transformations of the fullerenes that are interesting to follow and characterize. This involves fo…
To examine the effects of a two-cation ionic liquid as an electrolyte component of a supercapacitor, 1,4-bis(3-methylimidazolium-1-yl)butane tetrafluoroborate (MIBBF 4 ), dissolved in propylene carbonate (PC) or acetonitrile (ACN), is newly synthesized and tested here for potential use as an electrolyte of capacitor.T…
There are many physical situations where particles experience external fields or are in a nonisothermal environment. Monte Carlo (MC) simulations can be useful to understand such experimental systems at steady state. Within this context, we formulate a general framework to study these systems via inhomogeneous MC simu…
Different experimental procedures for the location of sources of Acoustic Emission (AE) avalanches during Martensitic Transformations are discussed. A first example corresponds to the 1D location of AE events during stress-induced martensitic transitions in a Cu-Zn-Al shape memory alloy (3.5 cm length). The obtained d…
Charpy impact tests were conducted on carbon reinforced epoxy composites fabricated by hand lay-up method using 0.47, 0.56 and 0.66 carbon fiber volume fractions; tests were conducted at temperatures between -60oC to 60oC. The impact strength was found, in general, to increase when the samples were fractured at temper…
We report a series of density functional calculations for different crystalline structures in the alloy Al${}_{n}$Si${}_{m}$Sr family. We perform a complete characterization for different crystalline space groups of the Al${}_{0.4}$Si${}_{0.4}$Sr${}_{0.2}$ alloy by determining the electronic structure and the mechanic…
촤-가스화 반응은 반응온도, 반응가스 부분압력, 시스템 총 압력, 입자크기 등 운전조건뿐만 아니라 촤의 화학적 조성 및 물리적 구조의 영향을 받는다. 본 연구에서는 두 종류의 역청탄 촤를 이용하여 반응온도 1,000- $1,400{^{\circ}C}$ 에서 $CO_{2}$ 가스화시 입자크기의 영향을 관찰하였다. 실험실 규모의 고정식 반응기를 이용하여 대기압 하에서 실험을 수행하였으며 반응가스인 $CO_{2}$ (40 vol%)가 반응기에 공급되면 촤와 반응하여 CO를 생성하였다. 촤의 탄소 전환율을 측정하기 위하여 비분산적외선 방식의 CO/ $CO_{2}$ 센서가…
Duplex stainless steels (DSS) are alloys made of ferrite and austenite, with a proportion of each phase around 50%. Their main advantage in comparison with other austenitic and ferritic stainless steels is the attractive combination of high strength and corrosion resistance together with good formability and weldabili…
Interfaces in martensites and ferroelastic crystals show internal structures which are not simply the interpolation of the two adjacent domains. These structures can influence solitary front propagation as observed for large depinning forces. They also contribute to local pinning of walls when the applied forces are c…
Gas shield electric arc coating of carbon steel surface is considered in relation to repair applications. Two types of wires are incorporated in the experiments including standard and nano-particle blended. The coating structure and the metallurgy are examined using the Scanning Electron Microscopy (SEM), and Energy D…
The thermal degradation of N -(salicylidene)- L -leucine was studied under non-isothermal conditions in air atmosphere. For kinetic analysis, the TG/DTA/DTG data obtained at three different heating rates were processed by Friedman, Kissinger-Akahira-Sunose, Flynn-Wall-Ozawa and Kissinger methods. The analysis indicate…
The mechanical equipments which are exposed to impure environment undergo significant reductions in their own lifetimes. Several environmental test procedures have been developed to analyze these phenomena. Moreover in the industry to require shorter development duration, accelerated life testers artificially add test…