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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 30 for “"PBG"”.
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Micro-fabrication of 3-D Si/air and Si/SiO₂/air PBG structures
Thesis (Elec. E.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998; and, Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Experimental studies of novel accelerator structures at 11 GHz and 17 GHz
Photonic band-gap (PBG) structures are promising candidates for electron accelerators capable of high-gradient operation because they have the inherent damping of high order modes required to avoid beam breakup due to instabilities. A key challenge for PBG structures is high-gradient operation …
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Novel photonic band gap structures for accelerator applications
… demonstration of the first photonic band gap (PBG) accelerator at 17.140 GHz. A photonic band gap structure is a one-, two- or three-dimensional periodic metallic and/or dielectric system (for example, of rods), which acts like a filter, reflecting rf fields in some frequency range and allowing …
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Experimental study of photonic band gap accelerator structures
… accelerator concept using a photonic bandgap (PBG) structure. Major advances in higher order mode (HOM) damping are required for the next generation of TeV linear colliders. In this work, PBG HOMs are studied theoretically and experimentally for the first time. PBG HOMs are shown in simulation …
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Two -Photon Polymerization of Defects in Photonic Crystals
For applications requiring a complete PBG, it is necessary to convert colloidal photonic crystals to higher refractive index structures that exhibit complete PBGs. To this end, self-assembled photonic crystals with embedded TPP features were replicated in silicon. The TPP features and colloidal …
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Photonic bandgap fibers for transmitting high peak-power pulses in the near infrared
Hollow-core photonic bandgap fibers (PBG) offer the opportunity to suppress highly the optical absorption and nonlinearities of their constituent materials, which makes them viable candidates for transmitting high-peak power pulses. This thesis demonstrates the fabrication and characterization of …
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Fibra de crital fotônico: fundamentação e aplicações
… consists of the study and analysis of the PBG (Photonic Band Gap )..tecnology incorporated in optical fiber structures. So, we'l1 present a complete PBG structure theory, and folowing this, we'l1 present also a chapter for convencional optical fiber, due to the need to construct the base …
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High index contrast platform for silicon photonics
… of light is controlled by its photonc bandgap (PBG) and the defect. The concept of photonic crystal can be applied to optical wavgeuides by placing the defect, which is surrounded with photonic crystal structures. In addition to wavgeuide applications, there are lots of unexplored attractive …
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Long Term Ocular Drug Delivery with Novel Pentablock Copolymers; Part I: Composite Nanoformulation of Macromolecules For Back of the Eye Diseases, Part II: Dexamethasone Nanoparticle to Develop an In Vitro Model for Glaucoma
… suspended in gel) for a sustained drug delivery. PBG (PLA-PCL-PEG-PCL-PLA; PBG-1 and PEG-PCL-PLA-PCL-PEG; PBG-2) gelling copolymers were evaluated for their utility as injectable in situ hydrogel forming depot for controlled ocular delivery of macromolecules (proteins, peptides and Fab fragments). …
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Photonic band gap structures for superconducting radio-frequency particle accelerators
… accelerating cavity with a photonic band gap (PBG) coupler cell. The structure serves as a building block for superconducting radio-frequency (SRF) electron accelerators. It has five accelerating cells: four cells of elliptical shape, commonly used for SRF cavities, and one PBG cell in the …
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On-chip silicon based photonic structures : photonic band gap and quasi-photonic band gap materials
… based photonic structures, photonic band gap (PBG) and quasi-photonic band gap (QPX) structures, which are based on high refractive index contrast dielectric layers and CMOS compatibility. We developed a new type of silicon waveguide - Photonic Crystal (PC) cladding waveguide is studied based …
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Floral abundance and soil characteristics affect wild bee community structures and nesting dynamics in tallgrass prairies
… such as burning, haying, and patch-burn-grazing (PBG). All treatments utilize burning, but haying removes aboveground biomass and PBG includes grazing by cattle. The impacts of these management practices on important ecological factors for bee species, such as floral community structure and …
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Experimental studies of hybrid photonic band gap accelerator structures
… high power tests of a hybrid photonic band gap (PBG) accelerator structure. PBG structures can support a single electromagnetic mode, thus damping higher-order modes (HOMs) generated by wakefields. We have designed, built and successfully tested a 17.14 GHz hybrid PBG (HPBG) structure containing …
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A 250 GHz photonic band gap gyrotron amplifier
… the amplifier uses a novel photonic band gap (PBG) interaction circuit. The PBG interaction circuit confines the TE₀₃-like mode which couples strongly to the electron beam. The PBG circuit provides stability from oscillations by supporting the propagation of TE modes in a narrow range of …
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A novel wideband gyrotron travelling wave amplifier
… Electron Device (VED) with a Photonic Band Gap (PBG) structure. The theory and experimental results from two other quasioptical gyrotron oscillator experiments are also presented. The gyro-TWT amplifier at 140 GHz produced up to 30 kW of peak power in operation with 3 ts pulses at 6 Hz, 2.30 GHz …
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Design, fabrication, testing, and application of a sub-wavelength microwave lens
… experimental validation of a photonic band gap (PBG) graded-index lens. PBGs can be used to achieve sub-wavelength focusing, which is not possible with lenses made from conventional dielectric materials. Subwavelength focusing is attractive for a variety of applications, including medicine, …
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An approach to sourcing optimization at a high volume soft drink manufacturer
The Pepsi Bottling Group (PBG) is the world's largest manufacturer, seller, and distributor of carbonated and non-carbonated Pepsi-Cola beverages. The supply chain network in the United States consists of 52 plants, over 360 warehouses, and an ever growing portfolio of SKU's. Currently, there is no …
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La actividad turística en la ciudad de Mar del Plata: estimación y análisis de su importancia económica, período 2004-2012
… para el año 2004 y refieren a un 28% del PBG, mientras que en el año 2012 alcanza los $8.256 millones lo que implicaría un 34,7% del PBG. En cuanto al análisis sociodemográfico, las variables observadas son edad, género, nivel de estudios y nivel socioeconómico, las que se han mantenido …
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La Porfiria Aguda Intermitente en la Región de Murcia: fenotipo clínico-bioquímico y calidad de vida.
… Los niveles elevados de porfobilinógeno (PBG) y ácido 5-aminolevulínico (ALA) (primeros metabolitos de la vía de síntesis de hemo) se utilizan para confirmar el diagnóstico. Las complicaciones más frecuentes a largo plazo son la hipertensión arterial (HTA), enfermedad renal crónica (ERC), …
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