Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 69 for “"nBn"”.
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Debating NBN policy : the influence of issue management
… a case study – the National Broadband Network (NBN). It largely confirms existing IM theory, and its applicability in a public policy context, finding that IM is practised across roles and levels within organisations involved in the debate. IM was seen to directly influence policies, including …
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Growth defects in CrN/NbN coatings deposited by HIPIMS/UBM techniques
… sets of chromium nitride/niobium nitride (CrN/NbN) coatings were deposited using HIPIMS technique combined with unbalanced magnetron sputtering (UBM) by varying the deposition parameters, i.e. deposition time (t = 15 to 120 min), bias voltage (Ub = - 40 to - 150 V) and chamber pressure (P = 0.2 …
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InAs/Ga(In)Sb superlattice based infrared detectors using nBn design
… of Auger recombination. The recently proposed nBn heterostructure design has demonstrated a 100 K increase in background-limited infrared photodetection (BLIP) for InAs-based device, by decreasing Shockley-Read-Hall generation currents and by suppressing surface currents using specific …
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Analytical studies of corrosion and wear resistant CrN/NbN superlattice PVD coatings.
CrN/NbN nano-scale multilayered coatings have found use in a number of commercial applications where both wear and corrosion resistance are important factors that are required. CrN/NbN nano-scale multilayered coatings have been successfully deposited at temperatures as low as 250°C on 304 …
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Investigation of InAs/GaSb superlattice based nBn detectors and focal plane arrays
… InAs/GaSb SLS detectors by implementation of the nBn design and a novel SU-8 passivation scheme, and realization of an nBn SLS FPA. This thesis covers three topics: 1) optical and electrical characteristics of single pixel nBn SLS devices operating in the MWIR and LWIR spectral regions; 2) …
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Study of ultranarrow superconducting NbN nanowires and nanowires under strong magnetic field for photon detection
… have coherence lengths much longer than NbN. Therefore, even though our wires are narrower by a substantial factor, they are still wider than the coherence length of NbN. As such the validity of the one-dimensional approximation to be presented in in 2.2 is debatable for our wires. …
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Optical properties of ultra-thin niobium nitride films for single photon detectors
… sputtered ultra-thin films of niobium nitride (NbN) and niobium titanium nitride (NbTiN). Using Variable Angle Spectral Ellipsometry (VASE), I found that the optical properties of NbN films appear to have a critical thickness above which the optical parameters stabilize. I also found that the …
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Implementation of Renewable Energy to Reduce Carbon Consumption and Fuel Cell as a Back-up Power for National Broadband Network (NBN) in Australia
A reliable power is paramount and loss of power to communication equipment can mean loss of service to clients and loss of millions of dollars to industries. Also, climate is changing; greenhouse gas emissions from human activity are the major cause for global warming.
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Mid-Wave and Long-Wave Single Uni-polar Barrier Infrared Detectors Based on Antimonide Material Systems
… reduce dark current. These designs include the nBn, CBIRD, pMp, and pBiBn. These designs have enabled detectors have dark current behavior to be within a factor of 2 of HgCdTe based detectors. The more basic of these designs, the nBn, has been utilized in InAs detectors, InAsSb detectors, HgCdTe …
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Longwave and bi-color type-II InAs/(In)GaSb superlattice infrared detectors
… and fabrication processes. The recently proposed nBn heterostructure design has demonstrated a 100 K increase in background-limited infrared photodetection (BLIP) for InAs-based device, by decreasing Shockley-Read-Hall generation currents and by suppressing surface currents using specific …
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Studies of Interfacial Phenomena: Alkanethiol Adsorption and Patterning on Gold and the Superconducting Proximity Effect in Superconductor /Semiconductor Systems
… superconducting proximity effect at Nb/InAs and NbN/InAs interfaces. Previous investigations of Nb/InGaAs show an excess conductance at low bias voltages when the system is superconducting. However, current models do not sufficiently explain this excess conductance. Raman spectroscopy is used in …
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Development of nanostructured PVD coatings for total knee replacement joints using HIPIMS.
… cathodes to deposit pure HIPIMS coatings. TiN/NbN, TiCN/NbCN and CrN/NbN multilayer coatings were deposited on CoCr alloy test buttons along with other (HSS, SS and Si) substrates since our intended application is on total knee replacement joints made of CoCr alloy. The knowledge gained by …
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Magnetism and superconductivity out of equilibrium: Towards ultrafast superconducting spintronics
… melting and recovery of superconductivity in NbN. Our optical pump-THz probe experiments show that, at low temperatures and laser fluences, the dynamics can be adequately described by considering the phonon-bottleneck effect through the Rothwarf-Taylor model. Moreover, we observe that the …
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Digital Platforms and Mobile Technologies for Development: Essays on Firm Formalization, Financial Inclusion, and Agricultural Resilience in Sub-Saharan Africa
Siehe https://nbn-resolving.org/urn:nbn:de:bvb:739-opus4-20704 für um Abbildung A2.4 ergänzte Fassung. See https://nbn-resolving.org/urn:nbn:de:bvb:739-opus4-20704 for version including Figure A2.4. Mobile technologies and digital platforms have expanded rapidly across sub-Saharan Africa, creating …
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Reactive DC magnetron sputtering of ultrathin superconducting niobium nitride films
… These improvements to the deposition of NbN have enabled the production of superconducting nanowire single photon detectors whose quantum efficiency saturates and was the starting point for work on the superconductor-insulator transition.
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Growth of amorphous tungsten silicide and study of the proximity effect at low dimensions for superconducting applications
… hybrid film with layers of both niobium nitride (NbN) and amorphous tungsten silicide (WSi). These hybrid devices use the proximity effect to potentially be more efficient than either of the materials alone. In order to make these devices, we first grew high quality samples of tungsten silicide …
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Effect of blast-furnace slag as cement replacement on hydration, microstructure, strength and durability of concrete
… application document of EN 206-1 (2000). NBN B15-001 (2004) describes the rules which should be applied. Summarizing, the k-value for BFS amounts to 0.9 and the maximum slag content which may be taken into account in the k-values concept is limited (slag-to-cement ratio <= 0.45 or 0.2 …
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Γενετική ανάλυση στον κληρονομικό καρκίνο του μαστού
… ATM, BARD1, MLH1, MRE11, MSH2, MSH6, MUTYH, NBN, PMS1, PMS2, RAD50, RAD51C) με την χρήση τεχνολογίας αλληλούχισης επόμενης γενεάς. Για το σκοπό αυτό αναλύθηκαν 42 ασθενείς με σοβαρό ιστορικό καρκίνο μαστού ή/και ωοθηκών, οι οποίες είχαν βρεθεί αρνητικές για μεταλλάξεις στα γονίδια BRCA1 & 2. …
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Local imaging of magnetic flux in superconducting thin films
… force microscopy (LT-MFM). Taken a 100 nm thin NbN film as an example, the depinning of vortices from natural defects under the influence of the force that the MFM tip exerts on the individual vortex was visualized and the local pinning force was estimated. The good agreement of these results …
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Novel structures for lattice-mismatched infrared photodetectors
… was therefore decided to investigate the use of nBn detector structures as lattice mismatched photodetectors. Using a design based on an InAsSb bulk-material absorber, a comparison was again drawn between two samples, one grown on mismatched GaAs and a second grown on native GaSb. This time, …
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