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 217 for “"BN"”.
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H-BN integration in III-nitride devices for green hydrogen applications
… Gallium Nitride), GaN (Gallium Nitride), and h-BN (hexagonal Boron Nitride), which are promising materials for hydrogen production and storage applications thanks to their unique properties. InGaN, for example, offers a tunable band gap, high chemical stability, and good catalytic activity, …
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Additive manufacturing and mechanical properties of 2D h-BN reinforced nanocomposite
… fracture toughness is only about 4 MPa·m1/2. h-BN is a kind of 2D material which has a similar lattice structure to graphene, with B and N atoms adjacent to each other. It is well known for it dielectric properties and widely used as dielectric substrate and protective layer. People has found …
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Remote Epitaxy by In-Situ Grown BN and InGaN Strain Relaxation
… based on MBE in-situ grown boron nitride (BN). Ultrathin (200nm) single-crystalline freestanding gallium nitride (GaN) film is obtained using this technique. A high throughput process is demonstrated to produce multiple freestanding membranes from a single wafer and in a single growth …
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Some irreducible complex representations of a finite group with BN pair
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1969.
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Synthesis of graphene and h-BN by chemical vapor deposition and their transfer process
… materials including hexagonal boron nitride (h-BN) and transitional metal dichalcogenide (TMDC). In particular, the excellent material properties of graphene fascinated engineering fields to use it as a device component of applications such as RF-device or photodetector. Among various synthesis …
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High yield production of inorganic graphene-like materials (MoS₂, WS₂, BN) through liquid exfoliation testing key parameters
… tungsten sulfide (WS₂), and boron nitride (BN) are known to have electronic properties. When exfoliated into layers and casted onto carbon nanofilms, they can become potentially cheap and efficient electronic materials for magnetic sensing and energy storage devices. The goal of this …
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From British Nationality to Political Resistance: BN(O) Status and the Vision for a Hong Kong Crown Dependency
… has offered British National (Overseas) (BN(O)) passport holders of Hong Kong a bespoke visa route to British citizenship. The purpose of this study was to provide a historical analysis of BN(O) status and how it evolved from being a token of British nationality into a tool of political …
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Synthesis of Ti₂AlC, Ti₃AlC₂ and Ti₃SiC₂ MAX phase ceramics; and their composites with c-BN
… strong and lightweight. Cubic boron nitride (c-BN) is a widely used abrasive in grinding wheels, which is exceeded in hardness only by diamond. Composites of c-BN and selected MAX phases may result in materials of some interesting and useful properties for application in industry. Firstly MAX …
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Histopathologic and Immunohistochemical Characteristics of Becker's Nevus
BACKGROUND: Becker's nevus (BN) is a unilateral, hairy, pigmented cutaneous hamartoma which frequently appears in adolescence. Several features of BN suggest that increased androgen sensitivity plays a role in its pathogenesis. The diagnosis of BN is usually made clinically. It is sometimes …
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Catalytic Role of Boron Nitride in the Thermal Decomposition of Ammonium Perchlorate
… becomes catalyzed. In this study, Boron Nitride (BN) nanostructures, a material previously unknown to act as a catalyst, is studied. The decomposition reaction is studied by thermo-gravimetric analysis / differential scanning calorimetry, X-ray photoelectron spectroscopy, fourier transform …
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Boron-carbon-nitrogen heterocycles for hydrogen storage: Synthesis and characterizations
… manner. Among the current hydrogen carriers, BN based compounds exhibit excellent volumetric and gravimetric storage capacity, but they still suffer from various drawbacks. In my project, I reported the first synthesis and characterization of 1,6;2,3-bis-BN cyclohexane, an isostere of …
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Anatomical Developments and the Role of Carbohydrate or Mineral Nutrient Deficiency in Bud Necrosis of 'Riesling' grapevines (Vitis Vinifera L.)
Bud necrosis (BN) is observed as an abortion and death of one or more primordia of the developing compound winter bud. Anatomical developments during the onset of BN in 'Riesling' and 'Chardonnay' grapevines were characterized. Examination of ultrathin (1micro m) sections of 'Riesling' buds under a …
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A Barkhausen Noise Testing System for CANDU Feeder Pipes
A Barkhausen noise (BN) testing system was developed for the non-destructive evaluation (NDE) of residual stresses in CANDU reactor feeder pipes. The system consists of a four-channel arbitrary waveform flux control system (FCS), and the spring-loaded tetrapole prototype (SL4P) BN probe. The …
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Processing and characterization of boron nitride composites and films
… and high electrical conductivity. Boron nitride (BN) provides a suitable alternative to carbon because of its oxidation resistance and its low dielectric constant. This thesis describes a novel approach to the synthesis of BN composites and films based on borazine, the boron-nitrogen analog of …
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Problem dependent metaheuristic performance in Bayesian network structure learning.
Bayesian network (BN) structure learning from data has been an active research area in the machine learning field in recent decades. Much of the research has considered BN structure learning as an optimization problem. However, the finding of optimal BN from data is NP-hard. This fact has driven …
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Ανάπτυξη, βιοκατανομή και φαρμακοκινητική μελέτη πεπτιδικών αναλόγων μπομπεσίνης επισημασμένων με διαγνωστικά ραδιονουκλίδια για την αντιμετώπιση του καρκίνου
… σχεδιάστηκαν και συντέθηκαν πεπτιδικά ανάλογα BN, κατάλληλα για επισήμανση με ραδιονουκλίδια, με την παρακάτω γενική δομή: Υ-Χ-ΒΝ(2-14) όπου Υ = ο χηλικός παράγοντας για τη σύμπλεξη του ραδιομετάλλου, Χ = η συνδετική ομάδα και ΒΝ(2-14) το φαρμακοφόρο τμήμα. (a) Προκειμένου να απεικονισθούν …
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Ultra-thin boron nitride films by pulsed laser deposition: Plasma diagnostics, synthesis, and device transport
… a PVD plasma plume ablated from a boron nitride (BN) target by a KrF laser at different pressures of nitrogen gas. Time resolved spectroscopy and wavelength specific imaging were used to identify and track atomic neutral and ionized species including B +, B*, N+, N*, and molecular species …
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Advancements in Hexagonal Boron Nitride for Thermal Neutron Detection Applications
Hexagonal boron nitride (h-BN) possesses many unique physical properties which combined have made h-BN an incredibly attractive material for a vast array of technologically significant applications. Some of these properties include extremely wide bandgap, strong optical absorption of above bandgap …
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Exploring the processes of change in individual cognitive behavioural therapy for bulimia nervosa from the patients’ perspectives : a grounded theory study
… to explore how individuals with bulimia nervosa (BN) understand processes of change in individual cognitive behavioural therapy (CBT). The treatment of individuals with BN remains a major challenge and research suggests that treatment only helps a modest number of individuals. The rationale for …
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Power Electronics Based on Ultrawide Bandgap Semiconductors: from Material Engineering to Device Applications
This work demonstrates high-performance BN/β-Ga2O3 metal-insulator-semiconductor Schottky barrier diodes (MIS SBDs). The BN layer is directly grown on the β-Ga2O3 by pulsed laser deposition (PLD). The presence of a ~2.8 nm BN layer is confirmed by a series of techniques, including X-ray …
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