Materials Literature
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The paper considers the current situation on the wear-resistant coatings and their practical application as the primary method of increasing of cutting tool performance.
Based on the homogeneity ($F[n_{\lambda m}]=\lambda^{p(m)}F[n]$) and invariance ($F[n_{\lambda m_0}]=F[n]$) properties of a functional of the electron density under uniform scaling of the coordinates in the density $n_{\lambda m}(\mathbf{r})=\lambda^{m} n(\lambda\mathbf{r}),\,(\lambda\in\mathbb{R}^+,\, m\in\mathbb{R})…
Fabric Ron Houchin (bio) When steel-wool clouds tumbleout of the west, and the air hoversbetween thirty-five and twenty-fiveFahrenheit, winds varying north to southwest, it will snow. Your mindlongs for it and over it: day snow amidsoil chunks of the winter disking likethe season’s dotted-swiss, weather always ending…
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采用溶剂热法, 以CuCl 2 ·2H 2 O、Zn(Ac) 2 ·2H 2 O、SnCl 4 ·5H 2 O作金属源, 硫脲作硫源, 乙二醇作溶剂, PVP作表面活性剂, 制备了Cu 2 ZnSnS 4 (CZTS)粉末。利用XRD、SEM、Raman、TEM、EDS、UV-Vis吸收光谱探讨了反应温度和反应时间对制备CZTS粉末的相结构、成分、形貌以及光学性能的影响。结果表明: 反应温度和反应时间对CZTS粉末的颗粒形貌和光学性能影响较大, 最佳合成温度为230℃, 反应时间24 h。该条件下生成的CZTS粉末相较为纯净、结晶完全, 形貌为表面嵌有薄片的微球, 各元素原子比接近化学计量比, 光学带隙为1.52 eV, 与太阳能…
采用等离子体增强化学气相沉积法(PECVD)制备了多孔SiO 2 薄膜, 系统地研究了不同浓度磷酸处理对多孔SiO 2 薄膜的质子导电特性、双电层电容和以此多孔SiO 2 薄膜为栅介质的铟锌氧(IZO)双电层薄膜晶体管性能的影响。结果表明: 多孔SiO 2 薄膜的质子电导率和双电层电容随磷酸浓度升高而增大, 60%浓度磷酸处理后多孔SiO 2 薄膜质子电导率和双电层电容分别达到1.51×10 -4 S/cm和6.33 μF/cm 2 。随磷酸浓度升高, 双电层薄膜晶体管的工作电压降低, 并且, 电流开关比也变大。其中60%浓度磷酸处理后器件工作电压为1.2 V, 迁移率为20 cm 2 /(V·s), 电流开关比为4×10 6 。…
Elucidation of possible pathways between folded (native) and unfolded states\nof a protein is a challenging task, as the intermediates are often hard to\ndetect. Here we alter the solvent environment in a controlled manner by\nchoosing two different co-solvents of water, urea and dimethyl sulphoxide\n(DMSO), and study…
Here, we report that K-doped BaMn2Bi2 shows no experimental evidence of superconductivity down to 1.5 K under pressures up to 35.6 GPa, however, a tetragonal to an orthorhombic phase transition is observed at pressure of 20 GPa. Theoretical calculations for the tetragonal and orthorhombic phases, on basis of our high-…
Simulasi Karakteristik Elektron dan Hole pada Daerah Pertemuan Dioda Silikon. Telah dilakukan simulasi mengenai karakteristik elektron dan hole pada daerah pertemuan dioda silikon. Simulasi dilakukan menggunakan metoda finite element. Tiga kuantitas hasil simulasi yakni carrier density, current density, dan maximum el…
Fenomena Partial Discharge (PD) pada bahan isolasi yang diakibatkan \npenerapan tegangan tinggi AC gelombang sinusoidal pada listrik bertegangan \ntinggi sekarang ini telah banyak diteliti. Berbagai hasil penelitian telah \nmemberikan data akurat mengenai mekanisme degradasi bahan isolasi yang \ndiakibatkan oleh fenom…
Hydrotalcite is a material which is used in various application and one of them as an adsorbent of Cr(VI). Hydrotalcite was synthesized using co-precipitation method with Al(NO3)3.9H2O and Mg(NO3)2.6H2O as raw materials. This research aim to study the initial concentration and adsorption isotherm of Cr(VI) by using M…
Electrical behavior of 3D interconnections (redistribution metal lines, through silicon via.,) used in 3D IC stack technologies is explored in this chapter. To well understand the interconnection incidence on 3D system performances, it is important to consider the whole electrical context of the 3D application, includ…
Based on the homogeneity ($F[n_{λm}]=λ^{p(m)}F[n]$) and invariance ($F[n_{λm_0}]=F[n]$) properties of a functional of the electron density under uniform scaling of the coordinates in the density $n_{λm}(\mathbf{r})=λ^{m} n(λ\mathbf{r}),\,(λ\in\mathbb{R}^+,\, m\in\mathbb{R})$, it is proven that homogeneity implies inva…
采用石墨还原法成功制备了烧绿石型富氧相Ce 2 Zr 2 O 8 , 选用缺氧型烧绿石Nd 2 Zr 2 O 7 作为Ce 2 Zr 2 O 8 相前驱体CeZrO 3.5 的替代物与之进行结构对比分析。实验结果表明: Ce 2 Zr 2 O 8 相中富余氧主要占据前驱体中的氧空位, 且氧离子扩散不会破坏原本有序排列的阳离子(Ce/Zr)亚点阵; 同时, Ce 2 Zr 2 O 8 相中Zr-O 配位体由前驱体中共顶联接的八面体转变为共棱联接的立方体, 其反相畴界密度和振动光谱谱带亦较前驱体明显提高。以上结果说明Ce 2 Zr 2 O 8 相结构处于亚稳态, 该结构特征有利于氧离子的快速吸附或释放, 这为其成为汽车尾气净化剂提供了…
La microstructure et en particulier la dureté de la fonte FGL200 utilisée dans le procédé de moulage à masque pour la fabrication des culasses pour les moteurs diesel, dépendent en grande partie de la vitesse de solidification et de refroidissement.L'utilisation successive du sable silicieux, de la pierre concassée et…
This paper presents an analysis of a leakage inductance for a toroidal type flyback transformer. The equation to calculate the leakage inductance is derived using the MMF diagram of the transformer. The analysis for the different types of the cores and winding structures is also provided using the FEM simulation. The…
본 연구는 경량 무기 발포보드를 이용한 커튼월시스템의 시공성 및 경제성 분석에 관한 연구로, 내화성 경량 무기 발포보드는 커튼월의 백패널로 이용하기 위해 개발된 신소재로 내화성능은 선행연구를 통해 실물 내화시험을 실시하여 이미 분석한 바 있다. 본 연구에서는 실제 건물에 내화성 커튼월 시스템을 설치하여 Mock-up test를 수행하고 일반적인 커튼월 시스템과 비교 검토하였다. 이 시스템은 기존의 커튼월 시스템과 동일한 방법으로 시공되는데, 다만 내화성능 확보를 위해 공장에서 제단되어 온 경량무기 발포보드 사용하고, 이를 커튼월 프레임에 취부한다. 비록 기존 커튼월…
시판되는 (S)-naproxen을 강염기 조건에서 라세미화하였다. 라세미화된 naproxen 시료를 분석하여 (R)- 및 (S)-naproxen의 피이크 위치를 확인한 후, 2013년 국내에서 시판된 19개 naproxen의 광학순도를 키랄 HPLC로 조사하였다. Chiralcel OD-H 칼럼과 ChiralHyun-LE(S)-1 칼럼 및 LUX-Cellulose-1 칼럼을 키랄 정지상으로 사용하였고, hexane:isopropanol:acetic acid가 100:1:0.1로 혼합된 용액을 전개용매로 사용하여 흐름속도 1.0 mL/min에서 분석하였다. 각 시료를…
In the present work, based on first-principles calculations, we show that it is possible to obtain a new high pressure polymorph of the CaSi2compound with a Laves structure. It corresponds to the MgCu2-type (C15) which is one of the three most important Laves phases. We also show that the two other structures, MgNi2-…
Pengembangan teknologi di bidang konstruksi yang semakin maju tidak dapat dipisahkan dari pengelasan, karena pengelasan mempunyai peranan penting dalam rekayasa dan reparasi logam. Terdapat beberapa faktor yang berpengaruh terhadap hasil dari proses pengelasan tersebut diantaranya adalah tegangan busur, kecepatan peng…