Spelling suggestions: "subject:"junction""
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Role of cytokines in junction restructuring and germ cell migration inmammalian testesXia, Weiliang., 夏偉梁. January 2006 (has links)
published_or_final_version / abstract / Zoology / Doctoral / Doctor of Philosophy
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Mechanisms of junctional restructuring at the sertoli-sertoli and sertoli-germ cell interfaces during spermatogenesisWang, Qiufan, Claire., 王秋帆. January 2008 (has links)
published_or_final_version / Biological Sciences / Doctoral / Doctor of Philosophy
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Transmission electron microscopy study of novel semiconductor heterostructures and high Tc superconductorsXin, Yan January 1996 (has links)
No description available.
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Fabrication and structural, optical, and electrical characterization of multisource evaporated copper-gallium-selenide polycrystalline thin films.Albin, David Scott. January 1989 (has links)
Theoretical considerations for the use of chalcopyrite ternary I-III-VI₂ compounds in heterojunction photovoltaic conversion devices are presented, followed by an in-depth study of the structural, optical, and electrical characteristics of multi-source evaporated CuGaSe₂ thin films as determined by processing. Film composition was identified as the primary variable for affecting the microstructure and optical-electrical behavior of the films. Film composition was in turn dependent upon elemental flux rates and substrate related effects. Films deposited on glass and bare alumina substrates were richer in selenium than films deposited on molybdenum coated substrates. Cu-poor, near stoichiometeric, and Cu-rich compositions were obtained by varying the Cu/Ga flux ratio. Cu-poor films deposited on bare ceramic substrates were characterized by secondary impurity phase content and a tendency for cubic CuGaSe₂ formation. The cubic nature of optically thin films deposited on glass was substantiated by a lack of crystal field splitting of the valence band as observed by optical absorption measurements. Cubic-tetragonal phase behavior was monitored on optically opaque samples by observation of intensity-independent (112)/(111) x-ray diffraction peak shifts. Cu-poor films on glass were also characterized by surfaces pitting at substrate temperatures in excess of 450°C which may be related to the high surface energy of gallium. Cu-poor films deposited on molybdenum coated alumina substrates exhibited less impurity phase formation and were largely single-phase tetragonal CuGaSe₂. Cu-rich films on all substrates contained CuₓSe impurities and tetragonal CuGaSe₂.
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Dislocations in strained-layer semiconductor heterostructuresLiu, Xian Wei January 1999 (has links)
No description available.
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Spin dynamics of carriers in quantum wellsBritton, Robert Stanley January 1999 (has links)
No description available.
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Magneto-optical studies of InAs/GaSb heterostructuresPoulter, Andrew James Langdale January 1999 (has links)
No description available.
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Electrodynamics of fluxon and semifluxon in 2D T-shaped Josephson Nano-JunctionsHassan, Hanaa S. January 2011 (has links)
Dynamic properties of Josephson junctions are interesting due to the emission of high frequency radiation (up to THz range) from Josephson junctions, closely related to fluxon dynamics. A better understanding of this dynamics can help to improve the Josephson devices used for applications. Josephson junctions can also be of great use as T-shaped multiple Josephson junctions in Josephson electronic circuits. In general, T-junctions consist of two attached Josephson transmission lines: a main Josephson transmission line (MJTL) along the -axis, and an additional Josephson transmission line (AJTL) along the -axis. These junctions can use to create fluxons (solitons) in junctions without applied magnetic field, (called flux cloning phenomenon). This work is devoted to contributing to a clarification of the dynamic behaviour of solitons (fluxons) in 2D extended conventional T-shaped Josephson junctions (extended means an AJTL is larger than MJTL). A conventional T-junction is a MJTL along the x-axis which divides into two Josephson transmission lines along the x- and y-axes. In addition, we also attempt to elucidate further the concept of flux cloning in rotated T-junctions, which are 90 degrees anticlockwise rotation of conventional T-junction. In rotated Tjunction, a MJTL along the x-axis divide into two Josephson transmission lines along the y-axis. We find the first evidence of moving semifluxon and observe for the first time new phenomena of semifluxons and anti-semifluxons in both extended conventional and rotated T-junctions. We numerically study the electrodynamics behaviour of solitons in the standard Tshaped Josephson junction (conventional T-junction) in a magnetic field. Therefore, we describe theoretically how flux cloning circuits exist and give an opportunity for use as flux flow oscillators operating without applied magnetic field. The results that emerge give further support to the flux cloning mechanism.
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Perpendicular magnetic tunnel junction with W seed and capping layersAlmasi, H., Sun, C. L., Li, X., Newhouse-Illige, T., Bi, C., Price, K. C., Nahar, S., Grezes, C., Hu, Q., Khalili Amiri, P., Wang, K. L., Voyles, P. M., Wang, W. G. 21 April 2017 (has links)
We present a study on perpendicular magnetic tunnel junctions with W as buffer and capping layers. A tunneling magnetoresistance of 138% and an interfacial magnetic anisotropy of 1.67 erg/cm(2) were obtained in optimally annealed samples. However, after extended annealing at 420 degrees C, junctions with W layers showed extremely small resistance due to interdiffusion of W into the MgO barrier. In contrast, in Ta-based junctions, the MgO barrier remained structurally stable despite disappearance of magnetoresistance after extended annealing due to loss of perpendicular magnetic anisotropy. Compared with conventional tunnel junctions with in-plane magnetic anisotropy, the evolution of tunneling conductance suggests that the relatively low magnetoresistance in perpendicular tunnel junctions is related to the lack of highly polarized Delta(1) conducting channel developed in the initial stage of annealing. Published by AIP Publishing.
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Frazzled’s Role in Synapse Formation at a Drosophila Giant SynapseUnknown Date (has links)
In Drosophila melanogaster, the GFS is synaptically coupled to the
Tergotrochanteral motoneurons; these neurons form a signaling pathway from the brain to
the jump muscles (Thomas and Wyman, 1983). Part of this signaling is done through gap
junctions, and placement of these gap junctions was partially shown to be regulated by the
binding of Netrin, a class of guidance molecule (Orr et al., 2014). In the present study we
investigate the role of Netrin's receptor Frazzled in the placement of gap junctions in
Drosophila at: 1) Presynaptic neurons (Giant Fibers [GF]), 2) Postsynaptic neurons
(Tergotrochanteral motoneurons [TTMn]), and 3) Presynaptic + Postsynaptic neurons
simultaneously. Effects of Frazzled were tested using Frazzled RNAi and a combination
of electrophysiological recordings and imaging of the GF-TTMn synapse. The results from
this study show that presynaptic and postsynaptic knockdown of Frazzled delayed
muscular responses and altered the anatomy of both the GF's and TTMn's. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2018. / FAU Electronic Theses and Dissertations Collection
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