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Ultrasonic studies of molecular crystalsYoon, C. S. January 1986 (has links)
No description available.
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Temperature dependence of Doppler-broadened positron annihilation radiation in hexagonal-close-packed metalsMcClean, Brendan Anthony January 1986 (has links)
No description available.
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The behaviour of ion implanted nitrogen in niobium : an internal friction studyBulmer, T. R. January 1987 (has links)
No description available.
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Positron beam study of technological filmsSaleh, Abdelnaser January 1996 (has links)
No description available.
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Modeling Atomic Defects in a Two-Dimensional Lennard-Jones Lattice Using Molecular Dynamics SimulationsTuesday, Andrew J. 16 May 2012 (has links)
No description available.
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Low-dimensional atomic-scale multiferroics in nonmagnetic ferroelectrics from lattice defects engineering / 格子欠陥の工学利用による非磁性強誘電体中の低次元原子スケールマルチフェロイクスXu, Tao 25 September 2017 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第20699号 / 工博第4396号 / 新制||工||1683(附属図書館) / 京都大学大学院工学研究科機械理工学専攻 / (主査)教授 北村 隆行, 教授 西脇 眞二, 教授 鈴木 基史 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM
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Crystallisation Processing of Al-base AlloysFjellstedt, Carl Jonas January 2001 (has links)
No description available.
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Crystallisation Processing of Al-base AlloysFjellstedt, Carl Jonas January 2001 (has links)
No description available.
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High-speed silicon detector structures for photonic integrated circuitsAckert, Jason January 2015 (has links)
Computing as a service is rapidly becoming the new normal for many sectors of the
economy. The widespread availability of broadband internet has allowed an extensive
range of services to be delivered on-demand from centralized computing systems known
as ‘data centers’. These systems have evolved to be enormously complex. Optical-based
communication is desired to increase data center capability and efficiency, however
traditional optical technologies are not feasible due to cost and size. Silicon photonics
aims to deliver optical communications on an integrated and affordable platform for use
in data centers by leveraging the existing capabilities of complementary metal-oxide
semiconductor manufacturing.
This thesis contains a description of the development of monolithic silicon
photodiodes for use in photonic integrated circuits in, and beyond, the current
telecommunications wavelength windows. The focus is on methods which are compatible
with standard silicon processing techniques. This is in contrast to the current approaches
which rely on hybrid material systems that increase fabrication complexity.
Chapter 1 and 2 provide background information to place this work into context.
Chapter 3 presents an experimental study of resonant devices with lattice defects which
determines the refractive index change in silicon-on-insulator waveguides. High-speed
operation of resonant photodiodes is demonstrated and is found to be limited by
resonance instability. Chapter 4 demonstrates high responsivity avalanche photodetectors
using lattice defects. The detectors are shown to operate error-free at 10 Gbit/s, thus
confirming their capability for optical interconnects. Chapter 5 presents photodiodes
operating with absorption through surface-state defects. These detectors show fast
operation (10 Gbit/s) and have an extremely simple fabrication process. Chapter 6
demonstrates photodiodes operating beyond the traditional telecommunications window.
Operation at 20 Gbit/s, at a wavelength of 1.96 µm is demonstrated, offering potential for
their use in the next generation of optical communication systems which will exploit the
thulium doped fiber amplifier. / Thesis / Doctor of Philosophy (PhD) / This thesis describes photodiodes constructed on silicon optical waveguides. The photodiodes are notable for their high-speed performance and simple fabrication methods. Such devices may find use within chip-integrated optical transceivers, which are desired for optical interconnects within large-scale computing systems such as data centers.
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Studium struktury submikrokrystalických materiálů pomocí rentgenové difrakce / Structure of submicrocrystalline materials studied by X-ray diffractionMatěj, Zdeněk January 2011 (has links)
Structure of submicrocrystalline materials was investigated by X-ray powder diffraction, mainly by modelling of widths and shapes of diffraction profiles. The diffraction method was applied to colloid gold nanoparticles, copper samples deformed by equal channel angular pressing and titanium dioxide nanoparticles prepared by various chemical routes. Dislocations and twin faults were identified in the metallic samples from characteristic broadening of diffraction lines. Densities of lattice defects were estimated from the diffraction data. Possibilities and limits of the diffraction method for characterisation of a crystallite size distribution were tested on the titanium dioxide samples. Crystallites of size in the range 3-25 nm could be well characterised. The problems were encountered only for samples with extremely broad size dispersion. Diffraction methods and a computer program were developed and tested, which can be applied also for the analysis of thin films.
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