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 26 for “"subchannel"”.
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Nuclear Subchannel Investigations Using CFD
Made available in DSpace on 2017-07-06T18:56:04Z (GMT). No. of bitstreams: 3 Rock_Daniel_T_MS.pdf: 62552009 bytes, checksum: 88a7dd5d3e4e5c67f3a3524e6c5b6f16 (MD5) Rock_Daniel_T_MS_ABS.pdf: 1681414 bytes, checksum: 0c61614b1bf9c4f31fa419ee777984c1 (MD5) license.txt: 4813 bytes, checksum: …
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Development of a method for BWR subchannel analysis.
Thesis. 1980. Ph.D.--Massachusetts Institute of Technology. Dept. of Nuclear Engineering.
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Axial and transverse momentum balance in subchannel analysis.
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Nuclear Engineering.
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Sum-rate maximization for two-way active channel with unequal subchannel noise powers
… destination through a set of parallel orthogonal subchannels. In such channels, the transmitted signals undergo path loss, phase shift, and can also be affected by multi-path propagation effects. In conventional wireless channel models, there is no control over the gain of each individual …
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Constitutive correlations for wire-wrapped subchannel analysis under forced and mixed convection conditions
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1984.
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Development of a two-fluid, two-phase model for light water reactor subchannel analysis
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1980.
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Experimental and analytical study of axial turbulent flows in an interior subchannel of a bare rod bundle.
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Nuclear Engineering.
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Investigation of velocity gradient as driving force of flow pulsation in fuel assemblies
… reactor fuel mostly rely on 1-dimensional subchannel simulation tools, which might not accurately predict the increased subchannel mixing caused by flow pulsations. The present work develops a quantitative relationship between subchannel mixing and the inter-subchannel velocity gradient, …
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Joint channel pairing and power allocation optimization in two-way multichannel relaying.
… strategies. We investigate the problem of joint subchannel pairing and power allocation to maximize the achievable sum-rate in the network, under an individual power budget at each node. To solve this challenging joint optimization problem, an iterative approach is proposed to decompose the …
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Sum-rate maximization for two-way active channels.
… is no control over the gain of each individual subchannel. We de ne an active channel as a parallel channel where by injecting power into the subchannels, somewhere between a transmitter and a receiver, the gain of the subchannels are adjusted. We herein study the problem of joint power …
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Cross-Layer Capacity Optimization In OFDMA Systems: WiMAX And LTE
… proposed. A cross-layer optimization design for subchannel, for Wimax, and physical resource block (prb), for lte, and power allocations with the objective of maximizing the capacity (in bits/symbol/hz) subject to fairness parameters and qos requirements as constraints is presented. An adaptive …
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Spectrum sharing systems for improving spectral efficiency in cognitive cellular network
… scheme for multicell CRN is proposed where the subchannel power allocation is performed by incorporating network-wide primary system communication activity. A collaborative subchannel monitoring scheme is proposed to evaluate the aggregated subchannel activity index (ASAI) to indicate the …
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Thermal-hydraulic analysis of innovative fuel configurations for the sodium fast reactor
… the RELAP5-3D code have been expanded to perform subchannel analysis in sodium-cooled fuel assemblies with non-conventional geometries. This expansion was enabled by the use of control variables in the code. When compared to the SUPERENERGY II code, the prediction of core outlet temperature agreed …
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Resource allocation and physical layer security in wireless communication systems
… simultaneously over a number of parallel subchannels, two fairness-aware resource allocation problems are investigated in the sense that certain QoS constraints are considered. Typically, this kind of problems fall within the NP class because of the integer nature of the involved user …
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Assessment of helical-cruciform fuel rods for high power density LWRs
… correlations. To address needs within these subchannel analysis models, experimental measurements of rod bundle coolant mixing have been conducted with 4x4 arrays of HC test rods. The tests used the technique of a hot water tracer injection (at 95°C) into a bulk flow of cold water (at 25°C). …
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Creating subchannels to improve throughput in wireless communication
… a single communciation channel into two separate subchannels. One subchannel is used to send large packets, and the other sends small packets. This split allows for the spectrum to be used more efficiently. Large throughput gains are possible, even with different mixes of traffic patterns. The …
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Transient analysis of hydride fueled pressurized water reactor cores
… geometries have been examined with the VIPRE subchannel analysis tool along with MATLAB scripts previously developed to automate VIPRE execution. The transients investigated were a large break loss of coolant accident (LBLOCA), am overpower transient, and a complete loss of flow accident. The …
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CFD Analyses of Flow Structures in Air-Ingress and Rod Bundle Problems
… the dominant frequency at the center of the subchannel is given as 2.4 Hz with a secondary dominant frequency of 4 Hz and a much minor frequency of 6 Hz. Generally, wavelet analysis has much better performance than POD in the air-ingress phenomenon that is a strongly transient scenario; they …
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Design and implementation of real-time cognitive dynamic spectrum radio, targeting the FM radio band with PHYDYAS FS-FBMC
… Out-Of-Band (OOB) leakage - and a non-contiguous subchannel mask, which can automatically reconfigure itself in real time to change the spectral characteristics of the output signal. It was developed using low level Digital Signal Processing (DSP) components from within MATLAB and Simulink.;The …
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An evolutionary fuel assembly design for high power density BWRs
… flow rate. The findings are as follows: - VIPRE subchannel analysis suggests that, due to its higher fuel to coolant heat transfer area and coolant flow area, the large assembly can operate at a power density 20% higher than the traditional assembly while maintaining the same margin to dryout. - …
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