Materials Literature
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Investigations of conditions for crystallization providing desirable modes of heat and mass transfer during terrestrial and space experiments have been carried out. They are necessary for semiconductor crystal growth with high homogeneity of properties using Ge doped with Ga. Mathematical simulation and experimental i…
녹색발광 -SiAlON:Eu 세라믹
The analogue of the hydrophobic hydration is explored for Lennard-Jones solutions. The free energy of solvation and its temperature derivatives, both in the constant-pressure process and in the constant-volume process, are obtained numerically for a variety of the size and energy parameters for the solute-solvent Lenn…
4,4`-(Hexafluoroisopropylidene)diphthalic anhydride (6FDA)와 bis [4-(3-mino phenoxy)phenyl sulfone (BAPS)의 조성에 cis-4-cyclohexene-I.2-dicarboxylic anhydride (CDBA)를 다양한 몰%로 사용하여 사슬 말단에 가교 반응이 된 폴리이미드(PI)를 얻었다. Grubbs 촉매 0.1 wt%를 사용하여 가교된 폴리아믹산(poly (amic acid), PAA)을 합성한 후에 PAA를 다양한 온도에서 열처리를 통해 가교된 PI 필름을 합성하였다. 제조된 필름…
在低模板剂浓度和弱碱介质中合成催化材料Si-MCM-41、Sn-MCM-41, 并用XRD、N 2 物理吸附-脱附、FT-IR、ICP-AES和TEM等手段对催化材料进行了表征. 研究了合成方法对制备Sn掺杂MCM-41介孔分子筛的影响, 结果表明: 水热晶化法(DHT)合成的Sn-MCM-41, Sn物种主要进入分子筛的骨架中; 而模板离子交换法(TIE)合成的Sn-MCM-41, Sn物种主要位于分子筛的表面. Sn-MCM-41介孔分子筛催化环己酮Baeyer-Villiger氧化反应结果表明, n (H 2 O 2 ): n (酮)＝3:1, 30g1,4-二氧六环为溶剂, H 2 O 2 为氧源, 70℃反应6 h, 环…
The recent progress of plastic finite element method (FEM) and its application in rolling are introduced, including: (1) progress in rigid plastic FEM theory and application. It deals with the variational principle for rigid-plastic compressible materials, the uniqueness of extreme point of total power rate functional…
In a refinery the fluidized catalytic cracking (FCC) process remains the major process to convert high boiling range vacuum gasoil (VGO) and other heavy hydrocarbon product intermediates from other refinery processes into higher value lighter hydrocarbons. FCC will produce a high yield (40-50 wt%) of cracked naphtha b…
Generally,the surface pretreatments such as sensitization and activation are necessary for depositing a nickel metal layer on oxide surface by electroless plating,however,for an oxide surface with porous structure it is possible that the pretreatment is not necessary.In this paper,only by use of the surface activity o…
Despite intensive research and substantial investments over the past decade, existing organic/hybrid photo voltaics (PVs) are still unable to overcome the 7% conversion efficiency barrier. Our innovative solar cells of third generation are based on photonic band gap structures using the exceptional optical properties…
본 실험은 김치의 유통기한을 연장하고자 배추김치에 열처리 및 천연보존료를 첨가하여 그 효과를 조사하였다. 400g의 배추김치를 각각 원형 polyethylene 플라스틱 용기에 담고 90℃에서 120분 처리하였을 때, 2.0 log₁?CFU/g만큼 총균수가 감소하였으나 열처리 10분 만에 용기의 변형이 일어났고, 김치의 관능변화가 감지되어 부적절한 조건으로 판정되었다. 필름 파우치에 김치를 옮겨 열처리하였을 때는 80℃에서 30분 이하로 열처리하였을 때 0.3 log₁?CFU/g의 저해효과를 보여 효과는 크지 않았지만 김치의 관능변화를 일으키지 않는 적정조건이었다.…
A 2D infinite sandwich-like framework [Cd2Cl2•(bfpf)•(bbp)2] •(H2O)]n 1 (H2bfpf = bis- (3- formyl-propionyloxyate)ferrocene, bbp = 4,4′-trimethylene-dipyridine) with porous structure was arranged by combining d10 Cd2+ ions with mixed flexible ligands bpp and disodium bis- (3- formyl -propionyloxyate)ferrocene. The thi…
MgO films are widely used as the first buffer layer in IBAD-YBCO coated conductors, whereas there are only a few examples of its use in RABiTS YBCO coated conductors. Nevertheless MgO, though challenging in terms of lattice parameter and epitaxy, can effectively passivate the metal substrate thus enabling the use of N…
A multi-laminated HTS tape conductor has been recently developed to fabricate large double pancake coils. If the HTS tapes are simply laminated to form the conductor, the current distribution in the laminated tape conductor of the coil is unbalanced because of different inductances of all tapes. It is very important t…
The photodoping phenomenon of Ag is one of the light-induced phenomena in GeS(2) amorphous chalcogenide films. It has potential as a process for fabricating photonic structures, such as waveguides and micro-optics, but its fabrication method is still under research. A dual functional laser scanning system integrating…
In the present work, we are reporting the effect of Mn doping on the structural, dielectric and ferroelectric properties of Ba0.80Pb0.20Ti0.90Zr0.10O3. Samples were prepared by solid state reaction route. X-ray diffraction analysis confirmed the compositions to be single phase. Dielectric properties were studied as a…
When designing high-temperature superconducting transformers, leakage magnetic field, ac loss, circulating current, and electromagnetic forces are important issues. These factors are accounted for by a proposed method providing initially different winding schemes, i.e., helical, cylindrical, and pancake. We pursue a v…
A charge trap folded nand (Fnand ) Flash memory device with band-gap-engineered (BE) storage node is proposed. Because of the compact cell layout without junction contacts, a nand Flash memory is the most suitable memory medium for electronic appliances. Two memory cells are put together to have a common vertical chan…
The microwave dielectric properties of CaLa(4-x)NdxTi5O17 ceramics were studied with a view to their potential for rectenna. The diffraction peaks of CaLa(4-x)NdxTi5O17 ceramics nearly unchanged as x increased from 0 to 0.007. The X-ray diffraction peaks of the CaLa3.995Nd0.005Ti5O17 ceramics revealed no significant v…
The synthesis of antimony thiourea tetra chloride (ATTC) single crystals by solution technique at room temperature is reported. The complex crystallizes in the orthorhombic space group Pnma with four formula units of Sb[CS(NH2)2]2Cl3.Cl in the unit cell. The structure has been solved by direct methods and refined to a…
Two new complexes constructed by 1,4-phenylenediacetic acid (H2PDA) and 2,2′-bipyridine (2,2′-bpy), namely [Cu(PDA)(2,2′-bpy)]·5H2O (1) and [Zn2(PDA)(2,2′-bpy)2Cl2] (2), have been synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR, and UV-Vis spectrum. Single-crystal X-ray diffra…