Materials Literature
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MAO 법을 이용하여 전류밀도 4A/㎠조건에서 3종류의 전해액과 코팅시간에 따라 AZ31 마그네슘 합금을 산화 피막 처리하였다. 코팅시간이 길어짐에 따라 코팅층의 표면형상은 기공이 더욱 커지고, 표면에 균열이 발생하기도 하 였다. 또한 코팅시간이 길어짐에 따라 코팅층의 두께와 경도(HV)값은 증가하였다. AZ31합금의 코팅층 상들은 MgO, Mg 2 SiO 4 그리고 MgAl 2 O 4 산화물로 이루어졌다. 산화코팅된 AZ31합금을 5% NaCl 용액에서 168시간동안 염수분무실 험결과 우수한 내식성을 나타냈다.
Σημαντικό επιστημονικό και τεχνολογικό ενδιαφέρον παρουσιάζει η ροή και μεταφορά θερμότητας ηλεκτρικά αγώγιμου ρευστού σε αγωγούς, υπό την επίδραση ισχυρού μαγνητικού πεδίου. Σημαντική εφαρμογή αποτελεί η ροή υγρού μετάλλου στον μανδύα που θα περιβάλλει τον μελλοντικό αντιδραστήρα πυρηνικής σύντηξης. Η επιβολή ισχυρών…
利用水热法合成了3d过渡金属离子掺杂Zn3（OH）2V2O7·2H2O的微米花结构，其分子式可表达为Zn3-3xM3x（OH）2V2O7·2H2O（其中M=Cu，Co，Ni，Mn；0．001≤x≤0．20）。应用XRD、SEM、TEM、UV-Vis DRS、EDX和BET等分析测试技术对产物进行了表征。结构和形貌分析结果显示过渡金属离子掺杂后产物仍保持Zn3（OH）2V2O7·2H2O的六方晶体结构，微米花由主晶面为（0001）的纳米片组装而成。紫外-可见漫反射光谱显示过渡金属离子掺杂后带边吸收红移，其中以Cu的掺杂产物Zn3-3xM3x（OH）2V2O7·2H2O最为明显，带边吸收扩展到可见光区。首次对Zn3（OH）2V2O7·…
Terdapat sebuah alat yang bernama Primary Reformer di PT. Pupuk Kaltim adalah suatu alat yang berbentuk tube yang berfungsi untuk memecahkan gas hydrocarbon menjadi hidrogen. Alat ini dioperasikan pada suhu 600-800oC dan tekanan 30-40 bar. Primary reformer dibuat dari material yang berbeda, material baja karbon (flang…
This thesis presents investigations on ultrafast laser irradiation of silicon towards the goal of hybridizing ultrafast laser processing and conventional semiconductor fabrication techniques to improve device applications. The fundamental sub-threshold damage accumulation mechanisms for potential defect engineering ap…
The electrochemical supercapacitors (ESs) are an emerging technology that promises to play an important role in meeting the demands of automotive and electronic industry. A notable improvement in ES performance has been achieved through recent advances in understanding charge storage mechanisms and the development of…
This specification establishes the requirements for rods, bars, and shapes of aluminum bronze with Copper Alloy UNS Nos. C61300, C61400, C61900, C62300, C62400, C63000, C63020, C63200, C64200, and C64210. Products shall be produced in tempers HR50
In this thesis, the research and development of a novel rapid figuring procedure for large ultra-precise optics by Reactive Atom Plasma technology is reported. The hypothesis proved in this research is that a metre scale surface with a form accuracy of ~1 μm PV can be figure corrected to 20 – 30 nm RMS in ten hours. T…
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Increases in vehicle exhaust emission regulations have led to research, development and improvements in catalytic converter technologies for gasoline-powered vehicles since the 1970s. Nowadays, there are strict regulations and standards for diesel engines as well, and one of the regulated species is nitrogen oxides (N…
The mechanical properties of depleted uranium plus 10 weight percent molybdenum alloy have been evaluated by high temperature compression testing. Compression testing was conducted at three strain rates over a temperature range of 400 to 800°C. The results indicate that with increasing test temperature, material flow…
This PhD work presents the synthesis of fluorescent nanoparticles (FNP) via a RAFT miniemulsion polymerisation and the analysis of their fluorescence properties. The core of the FNPs is a copolymer of styrene and a BODIPY monomer, and the shell, which is biocompatible and functionnalisable, is made of poly(ethylene ox…
Functional designing of natural amino acids (NAA) has received considerable attention in recent years due to its excellent biocompatibility. A novel self-assembling NAA, peptide RAG-16, was designed by hybridizing the characteristic silk fibroin motif (Gly-Ala) with an ionic complementary peptide sequence (Arg-Ala-Asp…
Conformal coating is a promising method of encapsulating therapeutic cells for immunoprotection during implantation in the human body. Therapeutic cells can include donor-derived primary cells, genetically modified lab lines, or stem-cell derived cells, that can express an enzyme or hormone needed by the recipient. La…
Excessive water formation inside the polymer electrolyte membrane (PEM) fuel cell’s structures leads to the flooding of the cathode gas diffusion layer (GDL) and cathode gas flow channels. This results in a negative impact on water management and the overall cell performance. Liquid water generated in the cathode cata…
The amount of natural fat in sheep’s skin varies significantly, and this depends upon the animal origin, sex, age, etc. In wool acquired from sheep’s skin from Australia and New Zealand, this content can account for up to 50% of dry skin weight. Fats are triglycerides of saturated fatty acids. These fats can cause com…
Surface chemistry can play an important role in determining the optical properties of silicon nanocrystals. On this page, referring to the article by Mita Dasog and Jonathan G. C. Veinot (pp. 1844–1846) it is shown that by changing the surface of silicon nanocrystals, their emission color can be tuned. Hydride surface…
During more than 150 years, the field of materials fatigue research has never lost its technical significance and its inspiring potential to tailor microstructures for high-loaded engineering materials. In particular, the reliability of lightweight structures, being a key issue in automotive and aeronautics industries…
Endless bar rolling technology with its intrinsic nature may be used to maximize the production efficiency and reduce production costs. While how to improve the butt joint quality of endless bar rolling system is of research worth with high application value. Hence, a novel control strategy based on the online feedbac…