Controlling morphology of multi-component block copolymer based materials
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2009.
Materials Literature
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Contrôle des températures de fusion de lanthanidomésogènes thermotropes par la connexion de chaînes flexibles divergentes
Ce travail de thèse présente l'étude de complexes de lanthanides avec des ligands possédant de longues chaînes alkyl. L'obtention de lanthanidomésogènes thermotropes à température ambiante relève d'un véritable défi. Pour cela, deux stratégies ont été adoptées. La première consiste à augmenter le nombre de longues cha…
Elemental depth profiling of thin film chalcogenides using MeV ion beam analysis
The comprehensive characterisation is one of many technical challenges in the fabrication of photovoltaic devices from novel materials. We show how the application of recent advances in MeV ion beam analysis, providing the selfconsistent treatment of Rutherford backscattering and particle induced X-ray emission spectr…
Systematical Analysis on Angular Distribution of Bremsstrahlung Radiation
The systematic analysis has been made the measurement results of the relative angular distribution of gamma quantium with 11÷16 MeV energy using experimental data of Ta, W, Cu, Mo and Ti targets with various radiating lengths thicknesses.
Influence of Nitrogen∕Methane Ratio on the Properties of Hydrogenated Amorphous Carbon Nitride Deposited by r.f. PECVD Technique
Hydrogenated amorphous carbon nitride (a‐CNx:H) thin films were prepared in a radio frequency plasma enhanced chemical deposition system with a parallel‐plate electrode configuration. The effects of nitrogen/methane flow rate ratio calculated on the a‐CNx:H thin films are studied in terms of the optical, bonding and p…
Perancangan dan pembuatan chasis mobile artificial dryer
Dalam suatu pembuatan alat diperlukan perencanaan yang matang agar hasilnya baik dan efisien dari segi waktu, biaya dan tenaga.
穿透型V形坑对GaN基p-i-n结构紫外探测器反向漏电的影响
研究了GaN基p-i-n(p-AlGaN/i-GaN,n-GaN)结构紫外探测器的漏电机理.实验发现,在位错密度几乎相同的情况下,基于表面有较高密度的V形坑缺陷材料制备的器件表现出较高的反向漏电.进一步的SEM测试发现,这种V形坑穿透到有源区i-GaN、甚至n-GaN层.在制备p-AlGaN电极时,许多金属会落在V形坑中,从而与i-GaN形成了肖特基接触.有些甚至直接和n-GaN形成欧姆接触.正是由于并联的肖特基接触和欧姆接触的存在导致了漏电的增加.
脉冲电化学沉积制备n-HA/ZrO2复合涂层
用脉冲电化学沉积法在生物医用钛金属表面成功制备了纳米HA/ZrO2复合涂层，涂层中的成分均以离子形式沉积到基材上，得到ZrO2均匀分布的HA/ZrO2复合涂层。脉冲电位为–3.5 V时有利于离子的沉积结晶，有利于复合涂层的沉积。复合涂层的成分、结构、形貌及生物活性等的研究结果表明：复合涂层烧结前成分为HA、OCP及碱式硝酸锆，高温烧结后得到均匀致密HA/ZrO2复合涂层。检测表明HA/ZrO2复合涂层能够诱导磷灰石生成，具有较好的生物活性。
Provinciaal beleid en dierenwelzijn: analyse gericht op landbouwhuisdieren in Noord- Holland = Provincial policy and animal welfare: analysis for farm animals in the province of North Holland
Provincial States of North Holland wants to consider the options to stimulate proctices for better welfare among farm animals. This report describes these options for the major farm animal species in North Holland: sheep, dairy cattle, farmed fish and horses
Rash spin-orbit interaction in graphene and graphene zigzag nano-ribbons
We investigate the effects of Rashba spin-orbit interactions on the electronic band-structure and corresponding wave-functions of graphene. By exactly solving a tight-binding model Hamiltonian we obtain the expected splitting of the bands -due to the SU(2) spin symmetry breaking- that is accompanied by the appearance…
镁合金表面激光熔覆Ni-Zr-Al合金涂层成分设计与组织性能
基于团簇线判据优化设计Ni-Zr-Al合金成分的基础上, 采用激光熔覆技术在AZ91 HP镁合金表面制备了Ni60.2Zr33.8Al6合金涂层。结果表明, 由于所设计的镍基合金具有低的熔点和良好的润湿性能, 致使合金涂层与镁合金基体之间实现了良好的冶金结合。合金涂层主要是由非晶相,Ni21Zr8和Ni10Zr7金属间化合物构成。由于非晶和金属间化合物复合增强作用及其高的化学稳定性, 致使合金涂层具有高的硬度、良好的耐磨和耐蚀性能。
Experimental study of extrusion and surface treatment of organo clay with PET nano-composites
Inclusion of organoclay in engineering polymers is increase annually and this trend will continue for the foreseeable future despite the economic downturn. This paper describes melt blending techniques using PET nanocomposites containing commercially available organoclays with different percentage of surfactant coatin…
Nonlinear and Chiro-Optical Properties of Aromatic Foldamers
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Edith Botek, Benoît Champagne, Raphaël Méreau, Frédéric Castet; Nonlinear and Chiro‐Optical Prope…
Влияние адгезии матрицы к армирующим включениям на эффективные характеристики полимерной композиции
In the work, the stress-strain state of a particle-reinforced polymer composition is modeled for various matrix − inclusion adhesive interactions. Estimates are made for the effect of the interphase interaction on the effective strain and strength characteristics of the composition. Consideration is given to the elast…
利用SBA-15介孔内纳米碳合成含介孔的ZSM-5分子筛
SBA-15介孔分子筛内填充蔗糖并炭化后，分别在碱性和弱酸性条件下，用含铝源及TPABr的溶液浸渍，将SBA-15分子筛孔壁的无定形结构转化成ZSM-5分子筛的晶体结构，除碳后得到含介孔的ZSM-5分子筛．用X射线衍射、N2吸附-脱附、27A1MASNMR、NH3-TPD、TEM、SEM等对样品进行了表征，考察了晶化时间等参数对样品的影响．结果表明，碱性条件下合成的ZSM-5分子筛晶体中含有少量孔径约3．2～4．2nm的介孔孔道，其酸强度接近与常规ZSM-5分子筛的酸强度；弱酸性条件下合成的ZSM-5分子筛晶体中含有大量孔径约1．4—1．6nm的孔道，其酸强度明显低于常规ZSM-5分子筛的酸强度．
Synthesis and Characterisation of Metal Chalcogenide Nanocrystals
Nanomaterials are defined as materials which possess features with dimensions of less than 100 nm. Nanocrystals are a subclass of nanomaterials, where the absolute dimensions of individual particles are within this range. Various effects become evident at such small scales, including notably: alterations in electronic…
A materials informatics approach for crystal chemistry
This thesis addresses one of the fundamental questions in materials crystal chemistry, namely why do atoms arrange themselves in the way they do? The ability to broadly design and predict new phases [i.e. crystal structures] can be partly met using concepts that employ phase homologies. Homologous series of compounds…
Influence of aging on damping behavior of TiNi/TiNi alloys synthesized by explosive welding
TiNi51/TiNi50.2 三明治的内部磨擦上的老化时间，测量频率和紧张振幅的影响合成被调查。DSC 和内部磨擦大小被采用描绘样品。标本的二座内部磨擦山峰被证实相应于 TiNi51 和 TiNi50.2 部件的反向的转变分别地。内部磨擦作为在不同测量频率的温度的功能被介绍，两座内部磨擦山峰的高度与减少的频率增加了，这被发现；然而，相应于 TiNi50.2 部件的增加比 TiNi51 部件的大。而且， TiNi/TiNi 合成合金的内部磨擦与增加测量紧张振幅减少了。TiNi51 部件的内部磨擦山峰的高度与增加变老的时间增加了，而 TiNi50.2 部件的没显著地变化。TiNi51 的内部磨擦的增加看起来与形成和生长被联系在变老的…
La cementogénesis examinada desde el punto de vista de la microcirculación
El proposito del presente estudio era realizar una observacion tridimensional del sistema microcirculatorio, via moldes de corrosion vascular, durante la aposicion del cemento despues de la cirugia de colgajo investigar la estructura permeable del endotelio vascular. Se confirmaron dos etapas de cicatrizacion posterio…
К методике определения сопротивления материалов импульсному нагружению
Купершляк-Юзефович Георгий Марианович. Кандидат технических наук, старший научный сотрудник кафедры «Прикладная механика, динамика и прочность машин» Южно-Уральского государственного университета. Область научных интересов - экспериментальные исследования эксплуатационной нагруженности конструкций и сопротивления мате…