Materials Literature
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Influences of Bi addition on microstructures and damping capacities of Mg2Si/Mg–Al–Si–(Bi) composites have been investigated. The Bi addition is beneficial to modify Mg2Si phase from coarse Chinese script shape to fine polygonal shape. Even though the Bi-containing alloy has modified polygonal Mg2Si compounds, its dam…
Multi-walled carbon nanotube (MWNT) paper was surface modified with gaseous oxygen and chlorine atoms, and analyzed by X-ray photoelectron spectroscopy (XPS). The oxygen atoms were produced by a low-pressure microwave (MW) plasma discharge of an Ar–O2 mixture and the results were compared to a previous study using VUV…
Boiling water reactor (BWR) bottom reflector calculations in lattice codes such as CASMO are presently used only to produce accurate boundary conditions for core interfaces in nodal diffusion codes. Homogenized cross-section constants and discontinuity factors are calculated in one dimension (1-D) without the explicit…
Hypoxanthine (HYP) has been evaluated as a corrosion inhibitor for mild steel in aerated 0.1 M hydrochloric acid by weight loss, potentiodynamic polarisation and electrochemical impedance spectroscopy techniques at 30 and 60 °C respectively. The results showed that hypoxanthine is a moderate inhibitor in the acidic me…
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2012.
This jointed system using specialized screws, called large diameter bolts, is one of the moment resisting joint systems. This system is characterized by cutting an internal thread directly to wood, by threading a large diameter bolt into the wood. In this study, the tensile behavior of these large diameter bolts embed…
There has been an increased use of metal-oxide nanoparticles in both commercial and consumer products. The use of these products and waste generated during manufacture may ultimately be released into the aquatic environment and the potential for these contaminants to cause impacts must be assessed. This study examines…
Na2S2O3 在中性水溶液中还原KMnO4 可制备得到暗棕色的可溶性MnO2 溶胶. 所制备的MnO2 溶胶透明、稳定,最大吸收波长位于357 nm 处, 平均粒径约40 nm. 研究发现, 所制备的MnO2纳米溶胶在酸性介质中与甲醛反应可产生弱的化学发光. 考察了近30 种药物分子在MnO2 纳米溶胶-甲醛体系中的化学发光行为. 结果表明, 吩噻嗪类药物、氨基硫醇类药物等对该体系的化学发光信号具有显著的增强作用. 据此, 建立了利用这一化学发光体系测定五种吩噻嗪类药物和四种氨基硫醇类药物新的流动注射化学发光分析方法. 所建立的方法被成功地用于片剂中奋乃静含量和猪饲料中盐酸氯丙嗪含量的测定. 通过对化学发光光谱、荧光光谱、紫外可…
Nanostructured Pb0.90Ba0.10Zr0.40Ti0.60O3 dense ceramics presenting an average grain size of 62 ± 5 nm was prepared by the polymeric precursor method and using the spark plasma sintering technique. The dielectric permittivity curves versus temperature exhibit broad anomaly, indicative of a diffuse phase transition. Th…
Purpose: The aim of this work is to determine the influence of alloy modification on the crystallisation kinetics and microstructure of the cast zinc alloy. This research work presents also the investigation results of derivative thermoanalysis performed using the UMSA device. The material used for investigation was t…
The metal complexes of manganese (II), Cobalt (II), Zinc (II) and Copper (II) with 2-chlorobenzaldehyde thiosemicarbazone (cbtsc) and 2-ethoxybenzaldehyde (ebtsc) have been synthesized and characterized by means of various physico-chemical rechniques viz. elemental analysis, magnetic susceptibility measurements, Infra…
Hierarchically structured, porous glass monoliths have been prepared successfully via combination of a salt sintering process and phase separation of a sodium borosilicate glass. The materials were characterized by N 2 -adsorption, Hg-intrusion and scanning electron microscopy. Secondary pore sizes were adjusted by th…
Se estudió el efecto de la humedad sobre propiedades físicas de granos de maíz Colorado Duro en el rango 17− 35% base seca, y la cinética de secado a temperaturas entre 30− 90°C y a velocidad de 0.43 m/s. El 12.91x10-3 m), diámetro contenido de humedad tuvo efecto significativo sobre la longitud (12.059x10-3− -3 -3 -3…
Superhydrophobic surface was prepared on the zinc substrate by chemical solution method via immersing clean pure zinc substrate into a water solution of zinc nitrate hexahydrate(Zn(NO3)2·6H2O) and hexamethylenete- traamine(C6H12N4) at 95 °C in water bath for 1.5 h, then modified with 18 alkanethiol. The best resulting…
INTRODUCTION: The cardiac bioprostheses are related to thromboembolic events, infectious and degenerative diseases. Wear is mainly attributed to the denaturation of collagen. Glutaraldehyde, the predominant method of preservation of bioprostheses, favors the calcification process and limits their durability. Several t…
This paper reports on the application of a simulation based Engine - Fuel Test Bench (EFTB) for studying performance of Diesel engine running on different fuels. The test bench is built around a zero-dimensional (0D) direct injection stochastic reactor model (DI-SRM) for engine in-cylinder processes simulation. Detail…
Die Produktion nachwachsender Rohstoffe für die Energiegewinnung hat in den letzten Jahren stark zugenommen. Doch auch die stoffliche Nutzung nachwachsender Rohstoffe erlangt aufgrund beschränkter Ressourcen für petrochemische Erzeugnisse steigende Bedeutung. Daraus ergeben sich einerseits Nutzungskonkurrenzen, andere…
It is now recognized that biological macromolecules such as components of the extracellular matrix (ECM) are important as instructive templates in Regenerative Medicine applications. They are now increasingly used in the development of a new generation of bio-mimetic materials that allow for restoration of function wh…
In different areas of science such as medicine, biology and engineering the image analysis is widely used. Quantitative measuring by the image analysis has also found application in metal materials science, especially in metallographic microstructure analysis. The measuring of the linear and area dimensions of the mic…
In this paper, we study the electronic performance of the inkjet-printed electrochromic (EC) display which uses Poly (3,4-ethylenedioxythiophene) (PEDOT) doped with poly (styrenesulfonate) (PSS) as the active material, and extract its equivalent RC model. Results show that by charging PEDOT:PSS with 1.8V for averagely…