Materials Literature
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Tantalum oxynitride thin films were deposited by reactive magnetron sputtering in a N2+O2 (85%+15%) atmosphere, with increasing total reactive gas flows. The chemical composition was determined by RBS and the structural development by XRD. The electrical resistivity was measured using the 2-point and 4-point probe tec…
Although a number of methods with appropriate approximations, such as mean-field theory, local density approximation, and tight-binding method have been well developed and widely used in solid state physics, they possess strong limitations, and thus physicists never stop trying to find methods that could rigorously so…
采用水热法和自然挥发法,邻羟基苯乙酮苯甲酰腙与过渡金属Ni（Ⅱ）、Cr（Ⅲ）反应,合成2种新型配合物。通过X射线单晶衍射对配合物结构进行了表征。配合物1：晶体为单斜晶系,C2/c空间群,晶胞参数a=1.5853（3）nm,b=1.16643（19）nm,c=1.8928（3）nm,β=90.00°,V=3.5000（10）nm3,Z=8,Dc=1.484g.cm-3。配合物2：晶体为四方晶系,I4122空间群,晶胞参数a=1.2272（4）nm,b=1.1098（4）nm,c=1.8849（6）nm,β=90.00°,V=2.5671（15）nm3,Z=4,Dc=1.445g.cm-3。配合物1的中心金属离子Ni（Ⅱ）与周围2个氧…
A qualidade das juntas soldadas é fortemente influenciada pela espessura das chapas unidas e pela condição térmica a que estas são submetidas durante o processo. Este trabalho tem como objetivo avaliar a distribuição de calor em juntas tipo filete com chapas de espessuras diversas, além de analisar os efeitos microest…
The problems increase the corrosion resistance nizkouglero-carbon steel with galvanized steel. Found that for steel specimens diameter of 2–3 mm of the electrodes SSSI 13/55, MP-3, RLA-8 galvanically chrome-plated, nickel and cadmium after hydrogen sulfide native NACE test environment for 96 hours, followed by test no…
Protein design requires reusable, trustworthy, and connectable parts in order to scale to complex challenges. The recent explosion of protein structures stored within the Protein Data Bank provides a wealth of small motifs we can harvest, but we still lack tools to combine them into larger proteins. Here I explore two…
Background. The interelement connection of modern power semiconductor devices must possess minimal electrical and thermal resistance, inductance and high mechanical strength in a wide range of operating temperatures. Metal layers coating the components of power semiconductor devices, silicon structures and molybdenum…
Active fire-retardant intumescent coatings form multilayered structures on protected surfaces under the influence of fire. A model is developed that describes the formation of multilayered structures in pulsed modes of propagation of the decomposition front. It is assumed that these modes occur due to an exothermal st…
Electrospinning has attracted great attention in the fields of tissue engineering and controlled release of drugs/biomolecules. The aim of this project was to investigate electrospinning of nanofibers with core-shell structures using emulsion electrospinning, the formation of monolithic and core-shell structured nanof…
We analyze the spatiotemporal behavior of species concentrations in a diffusion-mediated conversion reaction which occurs at catalytic sites within linear pores of nanometer diameter. A strict single-file (no passing) constraint occurs in the diffusion within such narrow pores. Both transient and steady-state behavior…
1 Preparation of DLC stripper foils For DLC stripper foils of about 5μg/cm2 thickness,the following methods were used.The DLC foils of about 4μg/cm2 thicknesses were produced by FCVA onto glass slides coated with betaine-saccharose as releasing agent,which was previously covered with the evaporated carbon layers of ab…
NOVELTY - The device has a carrier (1) which is provided with micro-cavity (2) for containing medium in direct contact with the object on which the medium is to be applied. Other carrier is provided with ring to protect the medium from environment when the carrier is applied to patient. The sensor is provided with pol…
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemical Engineering, February 2014.
采用原位合成的方法制备了CoPc／SnO2／TiO2复合材料，利用UV，IR，XRD，SEM对产物进行了表征．结果表明，复合材料在紫外光谱中出现了酞菁特征吸收Q带的红移现象，红外光谱中出现了M—O的振动吸收峰，在XRD图谱中显示出SnO2／TiO2晶粒变小，并且在SEM中看出晶粒尺寸基本和XRD图谱显示一致．说明CoPc与SnO2／TiO2之间形成部分化学键．
Molecular models for capturing the behavior of various entangled polymer systems were developed based on the physical framework of the tube model by Doi and Edwards and stochastic slip-link simulations built on similar ingredients. Using such models, we confronted three problems involving entangled polymers in this wo…
采用悬浮静置聚合的方法合成了硝酸掺杂的聚苯胺/凹凸棒黏土（PANI/ATP）纳米复合材料,用于含Cr（VI）废水的吸附。考察了吸附时间、物料配比、投料质量、温度和溶液pH值对吸附性能的影响,进行了动力学和热力学分析。结果表明,吸附过程是化学过程,化学配位作用起主要吸附作用,质量配比An∶ATP=1∶0.75,投料质量为0.5 g,吸附50 mg/L的Cr（VI）溶液,1 h时吸附率为99.60%,残留Cr（VI）的浓度为0.2 mg/L,达到国家排放标准。
Graphene, a single layer of carbon atoms, exhibits excellent charge transport properties. However, due to the absence of a band gap in this two-dimensional carbon nanostructure, graphene-based field effect transistors cannot be turned off. One strategy to increase the on/off ratio relies on patterning graphene into na…
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Química, Florianópolis, 2013.
Our recent progress on the preparation of a series of new FeSe-based superconductors and the clarification of SC phases in potassium-intercalated iron selenides are reviewed here. By the liquid ammonia method, metals Li, Na, Ca, Sr, Ba, Eu, and Yb are intercalated in between FeSe layers and form superconductors with t…
The research is an exhaustive study of the microstructure and of the stress-strain curves of structural steel S460N at temperatures typical of a fire. It includes a fractographic study of the fracture suifaces of cylindrical specimens, tensile tested at different fire scenarios, explaining the relationship between the…