Materials Literature
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The reverse transformation to austenite is an important part in the heat treatment process of steels.The final microstructures obtained by quenching,normalization or intercritical annealing(e.g.for dual phase steels) are strongly dependent upon the reverse transformation kinetics and austenitic structure.Therefore,it…
In this thesis, the author proposes and develops novel multilayered Surface Acoustic Wave (SAW) devices with unique attributes for gas sensing applications. The design, simulation, fabrication and gas sensing performance of three multilayered SAW structures has been undertaken. The investigated structures are based on…
Reaction-bonded Si 3 N 4 has cost-reduction merit because inexpensive silicon powder was used as a start material. But its density was not so high enough to be used for structural materials. So the sintered reaction-bonded Si 3 N 4 techniques were developed to solve the low density problem. In this study the sintered…
There has been unprecedented growth in wireless technologies in recent years; wireless devices such as cellular telephones and wireless local area network (WLAN) transceivers are becoming ubiquitous. It is now common for a single hardware device, such as a cellular telephone, to be capable of multi-band operation. Imp…
在有无磁场条件下进行了Cu-25%Ag（质量分数）合金的凝固实验,研究了强磁场对Cu-25%Ag合金凝固组织中富Cu枝晶内部Ag析出相的影响,测试了合金的硬度和电导率.发现有无磁场条件下,在不同大小的富Cu枝晶内部,Ag析出相的形态和尺寸各不相同,大尺寸富Cu枝晶内部的Ag析出相呈连续的棒状结构,小尺寸富Cu枝晶内部的Ag析出相呈非连续的颗粒状结构.另外,无磁场条件下析出的Ag相数量较多,尺寸较细小;有磁场条件下析出的Ag相数量较少,尺寸较粗大.受到Ag析出相的影响,强磁场条件下合金的硬度降低,电导率升高.对强磁场下Ag析出相的影响机理进行了探讨,并分析了析出相对合金硬度和电导率的影响机制.
Gels and dried powders of the single-nano buckydiamond (SNBD) have been studied by means of differential scanning calorimetry (DSC) and gas adsorption methods. Nanophase of water (NPhW) (D = 8.4 ± 0.5 nm) was confirmed in SNBD hydrogel by DSC. Nitrogen adsorption isotherms of the dried powder demonstrated the presence…
The water soluble ligand tris(hydroxyl-2-benzimidazolyl)amine NTBOH was used for the preparation of a series of aqua transition metal complexes and their hydroxo derivatives of the types [NTBOH-M(OH2)]2+ 1-3 and [NTBOH-M(OH)]+ 4-6 (M2+ = Zn2+, Cu2+, and Co2+]. Solid state studies of these model complexes were investig…
Background and aims – At one time it was believed that without reasonable fossil evidence the phylogeny of any group of organisms was almost unknowable. And so fossils were sought, found and their significance duly proclaimed. Such a dominating viewpoint slowly disappeared in the 1970s and 1980s and data derived from…
남해안에서 주로 여름철에 어획하여 부산 및 경남 지역을 위주로 소비하고 있는 군소에서 다당류 추출을 위한 최적조건을 검토하였다. 군소 다당류 추출을 위한 단백질 가수분해 효소로는 Flavourzyme 500 MG가 가장 효과적이었고, 추출한 다당류의 회수를 위한 가장 효율적인 추출물의 농도와 ethanol 첨가량은 각각 Brix 60과 5배량이었다. DEAESepharose 칼럼 크로마토그래피로 얻은 크로마토그램상의 전기전도도와 전기영동 이동도에 근거하여 0.5~0.75 M NaCl 상에서 용출되는 물질이 GAG임을 확인하였으며, heparan sulfate인 것으…
ZrB 2 has a melting point of 3245 o C and a relatively low density of 6.1 g/cm 3 , which makes this a candidate for application to ultrahigh temperature environments over 2000 o C. Beside these properties, ZrB 2 is known to have excellent resistance to thermal shock and oxidation compared with other non-oxide engineer…
An adhesive bond does not necessarily fail at its “weakest link”. The loading mode, the thickness of the adherends and adhesive layer, the presence of localised flaws, and the residual stress state within the adhesive layer can all affect the failure strength and energy of an adhesive bond. This means that very simila…
In the title coordination polymer, {[Eu(C(7)H(2)NO(5))(H(2)O)(3)]·H(2)O}(n), the Eu(III) atom is eight-coordinated by a tridentate 4-oxidopyridine-2,6-dicarboxyl-ate (hpc) trianion, two monodentate hpc anions and three water mol-ecules, forming a distorted bicapped trigonal-prismatic coordination geometry. The hpc lig…
Kinetics of oxidation of D-glucose (D-Glu) by N-bromopthalimide (NBP, C8H4O2NBr) in presence of [RuCl2(H2O)3OH] as a homogenous catalyst in perchloric acid medium has been investigated. The kinetic results indicate that the reaction was first order on [NBP] and zero order on [D-Glu]. The reaction followed first-order…
Frit Frit-
We have fabricated ex situ processed MgB2round wires and tapes sheathed with various metals using chemically treated powders. The critical current density (Jc) properties of the as-fabricated wires and tapes are not so different, that is, independent of the sheath materials. On the other hand, the transportJcpropertie…
An outstanding question about the underdoped cuprates concerns the true nature of their Fermi surface which appears as a set of disconnected arcs. Theoretical models have proposed two distinct possibilities: (1) each arc is the observable part of a partially hidden closed pocket and (2) each arc is open, truncated at…
fusion energy, hydrogen, biofuels, fuel cells and efficient energy end use. No single technology can meet this challenge by itself. Different regions and countries will require different combinations of technologies to best serve their needs and best exploit their indigenous resources. The energy systems of tomorrow w…
This research evaluates the changes in the comfort-related properties of high-density fabric, such as moisture permeability and waterproofness, in order to assess the relative importance of laundry conditions for clothing properties after repeated laundering and suggest the best laundering conditions for high-density…
以CO 2 为抗溶剂介质, 无水乙醇为溶剂, 采用超临界抗溶剂法(SAS)制备了纳米Al 2 O 3 -ZrO 2 复合氧化物颗粒的前驱体—纳米Al(NO 3 ) 3 -Zr(NO 3 ) 4 颗粒, 系统考察了温度和压力等因素对制备过程的影响, 并对前驱体中Al、Zr组分的共抗溶剂效应进行了研究, 通过焙烧前驱体Al(NO 3 ) 3 -Zr(NO 3 ) 4 制得了纳米Al 2 O 3 -ZrO 2 球形颗粒. 采用热重质谱(TG-MS)、X射线衍射(XRD)、X射线光电子能谱(XPS)、场发射透射电镜(FEG-TEM)和程序升温还原(TPR)等技术对所制备的前驱体Al(NO 3 ) 3 -Zr(NO 3 ) 4 和Al 2…
0.2 mol% of Sm3+ or Dy3+ ions doped magnesium calcium bismuth titanate ((MgCa)2Bi4Ti5O20) ceramic powders have been synthesized by a solid state reaction method in order to study the photoluminescence properties. Photoluminescence spectra of Sm3+: (MgCa)2 Bi4Ti5O20 ceramics have shown strong reddish-orange emission at…