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 17 of 17 for “"Microcells"”.
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Acetylene-filled pressure broadened short photonic microcells
We have developed short acetylene-filled photonic microcells (PMCs’) as optical frequency references in the near infrared region for applications in telecommunication, gas sensing, and metrology. The PMC is a 5-10 cm long hollow-core photonic crystal fiber (HC-PCF) in which the high pressure …
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Materials and design strategies for solar microcells
… metallic reflectors that are integrated below microcells, a light trapping structure on the cell’s surface, a down-shifting material that coverts ultraviolet light into visible light, as well as optical elements that can spectrum split light between two subcells of different band gaps. The …
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Assembly and light management of solar microcells for concentration photovoltaics
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2020-08-01
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Coherence bandwidth characterisation for indoor mobile radio microcells at microwave and millimetre wave frequencies
… the coherence bandwidth of indoor mobile radio microcells at 11 GHz and 62.4 GHz. Furthermore, the influence of the antennas radiation patterns and the effect of furniture on the value of the coherence bandwidth has been investigated.<br/><br/>A two branch frequency diversity system has been …
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Ultrathin mono-crystalline silicon photovoltaic cells with mechanically flexible and stretchable designs, and light-trapping structures
… I describe four related topics of silicon solar microcells which involve forming structures and assembling them by structured or non-structured elastomeric stamps. Furthermore, this thesis demonstrates a strategy in which modules consist of large-scale arrays of interconnected high-performance …
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High quality optical and optoelectronic materials for efficient light management and solar spectrum control and conversion
… materials and processing. Silicon solar microcells are re-designed to account for high series resistance and poor absorption. A back contact design significantly reduces the series resistance within the solar microcell and allows for an anti-reflection coating on the front surface to …
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Fabrication and light management of microscale solar cells
… fabrication of second-generation silicon solar microcells, with enhanced processing robustness and energy conversion efficiency by utilizing a thermally grown SiO2 material, which serves as both an etching/doping mask and a passivation/anti-reflection layer. Combined with a backside-reflector …
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Modelling and Analysis of Resource Management Schemes in Wireless Networks. Analytical Models and Performance Evaluation of Handoff Schemes and Resource Re-Allocation in Homogeneous and Heterogeneous Wireless Cellular Networks.
… a microcell flow over to an overlay macrocell. Microcells in the HCN can be replaced by WLANs as this can provide high bandwidth and its users have limited mobility features. Efficient sharing of resources between wireless cellular networks and WLANs will improve the capacity as well as QoS …
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A Novel Process to Create Arbitrary Microcellular Patterns in Polycarbonate using a Laser Beam
… we introduce a versatile process to nucleate microcells in polycarbonate sheets via laser beam. This method allows local heating of CO2 saturated polycarbonates which results in the creation of arbitrary shapes of microcellular foamed regions in a plastic part. We present the processing …
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Advanced handover procedure for cellular communication systems
… mixed cell architecture in which picocells, microcells and macrocells are used to achieve full coverage and increase the spectral capacity. Supporting higher numbers of mobile terminals and the use of smaller cells will result in an increase in the number of handovers, and consequently an …
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Fabrication Techniques for Unusual Electronic Systems: Silicon Microstructures for Photovoltaic Modules
… and photovoltaic modules composed of silicon microcells with reduced purity requirements, high voltage outputs, and mechanically flexible designs. These specific applications are a result of their microscale design combined with the ability to manipulate the material, in a practical way, by …
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Unconventional structured semiconductors and their applications in optoelectronics and photovoltaics
… Si solar cells. These 3D constructs allow the microcells to harvest both the directly incident and diffuse components of sunlight, thereby improving the solar energy conversion efficiency. The output power of the 3D solar cell was observed to be about 2 times as compared to that of a …
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Fundamentals of the Simplex Communication Channel With Retransmissions
… propagation data for several different types of microcells to arrive at a more precise theory of the link.
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Power-Aware Planning and Design for Next Generation Wireless Networks
… of each base station, and strategi- cally place microcells to offload the traffic transmitted to/from BSs to save total power consumption.</p> <p>In online resource allocation, we aim to save tranmit power of UEs by en- abling device-to-device (D2D) communications in OFDMA-based wireless net- …
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Clustered-dot periodic halftone screen design and ICC profile color table compression
… coverage. To address this limitation, the microcells can be grouped into supercells. The challenge is then to determine the desired supercell shape and the order in which dots are added to the microcell. Using DBS to determine this order results in a very homogeneous halftone pattern. To …
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Generic Adaptive Handoff Algorithms Using Fuzzy Logic and Neural Networks
Efficient handoff algorithms cost-effectively enhance the capacity and Quality of Service (QoS) of cellular systems. This research presents novel approaches for the design of high performance handoff algorithms that exploit attractive features of several existing algorithms, provide adaptation to …
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Micro-photovoltaic materials and systems for solar energy harvesting and light management
… electronics. Specifically, silicon solar microcells (µ-cells) offer a variable degree of transparency when assembled in sparse or dense arrays on transparent substrates. This dissertation focuses on i) the design of silicon solar µ-cells for improved device efficiencies, and ii) the …