Scintillator having a MgAI.sub.2O.sub.4 host lattice
A scintillator having a host lattice of MgAl.sub.2O.sub.4 was prepared by hot pressing under a vacuum environment a powder mixture of MgAl.sub.2O.sub.4, CeO.sub.2, and LiF.
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Μέλετη στροβιλοϋπερπληρωτών και μοντελοποίησή τους
Η παρούσα διπλωματική εργασία αποτελεί μία γνωριμία με το στροβιλοϋπερπληρωτή. Στα πλαίσια της παρουσίασης, περιγράφονται τα βασικά μέρη από τα οποία αποτελείται και γίνεται προσπάθεια κατηγοριοποιήσεώς τους βάσει των χαρακτηριστικών τους. Επίσης, δίνεται έμφαση στην κατασκευή των μεγάλων στροβιλοϋπερπληρωτών που χρησ…
Molecular Motions of [N(C2H5)4]+and [N(CH3)4]+ions by1H Nuclear Magnetic Resonance Relaxation in [N(C2H5)4]2CoCl4and [N(CH3)4]2CoCl4Single Crystals
The line widths and spin-lattice relaxation times of protons in $[N(C_2H_5)_4]_2CoCl_4$ and $[N(CH_3)_4]_2CoCl_4$ single crystals were investigated in the temperature range 160-400 K. The temperature dependences of the spin-lattice relaxation times are attributed to the molecular motions of the ethyl and methyl groups…
Άμεση εκτύπωση οργανικών υλικών με laser για την ανάπτυξη φωτοβολταϊκών στοιχείων
Τα τελευταία χρόνια έχει υπάρξει έντονο ερευνητικό ενδιαφέρον για την ανάπτυξη φωτοβολταϊκών συσκευών βασισμένων σε οργανικούς ημιαγωγούς. Οι οργανικοί ημιαγωγοί έχουν ήδη χρησιμοποιηθεί με επιτυχία για την κατασκευή τρανζίστορ και οργανικών διόδων εκπομπής φωτός (LED). Ειδικά τα οργανικά LED (OLED) έχουν δείξει να κυ…
Parametrization of coarse grained force fields for dynamic property of ethylene glycol oligomers/water binary mixtures
To evaluate shear viscosity of ethylene glycol oligomers (EGO)/water binary mixture by means of coarse-grained molecular dynamics (CG-MD) simulations, we proposed the self-diffusion-coefficient-based parameterization of non-bonded interactions among CG particles. Our parameterization procedure consists of three steps:…
INFLUENCE OF TEMPERATURE ON INFILTRATION PROCESS OF LIQUID COPPER IN W SKELETON
The effects of temperature on liquid infiltration of molten copper in W skeleton pores are investigated by numerical simulation. The unsteady state infiltration processes of molten copper in the same W skeleton pores are studied at the temperature of 1373K, 1473K and 1593K, respectively. The mobility of molten copper…
Growth Characteristics of Amorphous Silicon Oxide Nanowires Synthesized via Annealing of Ni/SiO2/Si Substrates
In this work, we investigate the growth behavior of silicon oxide nanowires via a solid-liquid-solid process. Silicon oxide nanowires were synthesized at $1000^{\circ}C$ in an Ar and $H_2$ mixed gas. A pre-oxidized silicon wafer and a nickel film are used as the substrate and catalyst, respectively. We propose two dis…
R&D OF SIC F / SIC COMPOSITE FOR FUSION REACTOR MATERIAL
During the operation of a fusion reactor, a certain type of transients could induce rapid cooldown of the reactor with relatively high or increasing system pressure. This induces a high tensile stress at the inner surface of the blanket, which is called the thermal shock. Test Blanket Module (TBM) has been designed to…
COMPARISON OF SLIDING WEAR AND THREE-BODY ABRASIVE WEAR CHARACTERISTICS OF PLAIN CARBON STEEL
Sliding wear and three-body abrasive wear characteristics of plain carbon steel (0.19C-0.72Mn) were compared to understand mechanisms of both wear in the steel. Microstructure of the steel was varied by heat treatments, and effects of microstructure as well as hardness on both wear were investigated. Dry sliding wear…
Simulated coating of carbon nanotube networks by a beam of carbon atoms
Abstract We have carried out MD simulations for coating of carbon nanotubes (CNTs) using a beam of energetic carbon atoms. At low energies Ebeam < 10 eV the sp2 network remains nearly intact and CNTs grow in diameter. The growth is not uniform but the deposited atoms tend to cluster (see figure). At intermediate energ…
Application of Laser-Generated Ultrasonic to Phase Transformation Analysis in Shape Memory Alloy Sheets
Lamb wave dispersion curves for NiTi shape memory alloy sheet are given. The multimode Lamb waves were generated in NiTi sheet by a pulse laser beam. The modes sensitive in characterizing phase transformation were selected on the basis of the dispersion curves. Piezoelectricity transducers were used to receive S 1 and…
Recombinant Expression, Isotope Labeling and Purification of the Vitamin D Receptor Binding Peptide
The vitamin D receptor binding peptide, VDRBP, was overexpressed as a fused form with the ubiquitin molecule in Rosetta(DE3)pLysS, a protein production strain of Escherichia coli harboring an induction controller plasmid. The fusion protein was bound to the immobilized metal ions, and the denaturation and renaturation…
OPTICAL PROPERTIES OF ELECTROCHEMICALLY DEPOSITED 1-D INTERLINKED NANOWIRED Co 3 O 4 THIN FILMS
The preparation of Co 3 O 4 films containing 1-D interlinked nanowires by electrochemical deposition technique using CH 3 COO )2 Co .4 H 2 O solutions in distilled water and study of their optical properties are reported in this paper. The films are characterized by using XRD, UV-visible & FTIR spectroscopies, XPS and…
Torque ripple minimisation in SR motors using phase inductance gradient compensation technique
The switched reluctance motor (SRM) is intended to operate in deep magnetic saturation to increase the output power density. Because of the saturation effect and the variation of magnetic reluctance with respect to rotor position, all the relevant characteristics of the machine are highly non-linear functions of both…
Fotossensibilização de vesículas lipídicas gigantes
We have synthesized the amphiphile photosensitizer PE-porph consisting of a porphyrin bound to a lipid headgroup.We studied by optical microscopy the response to light irradiation of giant unilamellar vesicles of mixtures of unsaturated phosphatidylcholine lipids and PE-porph.In this configuration, singlet oxygen is p…
Magneto-mechanical dynamics at the nanoscale
Gyromagnetic experiments, the Barnett effect (magnetization by rotation) and the Einstein-de Haas effect (rotation by magnetization), were initially devised to test the molecular current hypothesis and determine the electron g-factor at the dawn of quantum mechanics. Advances in fabrication techniques and an ever incr…
Structural integrity of hierarchical composites
Interface mechanical problems are of paramount importance in engineering and materials science.Traditionally, due to the complexity of modelling their mechanical behaviour, interfaces are often treated asdefects and their features are not explored. In this study, a different approach is illustrated, where the interfac…
可溶液加工的D-A-D型有机小分子的烷基链效应及光电性能
设计合成了3种可溶液加工的基于噻吩给体和2-吡喃-4-亚基丙二氰(PM)受体的新型Donor-Acceptor-Donor(D-A-D)型有机小分子TPT-N, TPT-S和TPT-D. 研究了噻吩给体单元上烷基链的数目对分子的溶解性、 光物理(吸收特性)、 热稳定和光电性能的影响. 结果表明, 随着烷基链的增加, 分子的溶解性增加, 成膜性能提高; 分子在溶液中的吸收光谱发生红移, 薄膜的吸收谱带变窄, 分子的最高占有分子轨道(HOMO)能级提高. 以D-A-D型有机小分子为给体, 富勒烯C 60 衍生物-苯基-C 61 -丁酸甲酯(PCBM)为受体制备了结构为ITO/PEDOT∶PSS/D-A-D∶PCBM/LiF/Al的体异…
ZrOCl 2 掺杂对磷硅酸盐凝胶质子导电性能的影响
采用溶胶-凝胶技术研究了ZrOCl2·8H2O掺杂对磷硅酸盐凝胶质子导电性能的影响. 结果表明, 掺杂ZrOCl2·8H2O能提高磷硅酸盐凝胶的质子电导率, 并且掺杂质量分数为0.97%时质子电导率达到最大值(σ130=2.38 S/m). 掺杂样品在相对湿度为40%条件下放置30 d后, 未发生H3PO4渗出现象, 其质子传导性能基本不变. 核磁共振谱结果表明, 掺杂ZrOCl2减少了磷硅酸盐凝胶结构中自由磷酸的形成, 提高了与四面体之间的化学结合力.
无溶剂Fe 3 O 4 纳米流体的制备及表征
采用共沉淀法合成Fe 3 O 4 纳米粒子, 将含有硅氧烷基的离子型改性剂二甲基十八烷基氯化铵与Fe 3 O 4 纳米粒子进行接枝反应, 再用脂肪醇聚氧乙烯醚磺酸盐的长链阴离子交换Cl - , 在Fe 3 O 4 纳米粒子表面生成具有阴、 阳离子双电层结构的表面处理层, 得到无溶剂Fe 3 O 4 纳米流体. 研究结果表明, 在Fe 3 O 4 纳米粒子表面成功接枝了有机物长链, 改性的Fe 3 O 4 纳米粒子呈单分散分布, 其损耗剪切模量 G ″明显大于储能剪切模量 G ', 具有明显的流体行为, 在室温下即可流动.