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Dissertations / Theses on the topic 'Subchannels'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Guellouz, Mohamed Sadok. "Heat transfer in rod bundle subchannels." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5960.

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Presented in this study is an experimental investigation of heat transfer in a model of the 37-rod CANDU reactor bundle. Localized heat was provided by a narrow heated strip mounted on the central rod, which could be traversed within the duct and rotated about its axis. The relative variation of the "apparent" local heat transfer coefficient around the central rod was determined for various rod-wall proximities including two limiting cases of rod-wall contact and rod-rod-wall contact. The flow temperature measurements were concentrated on the rod-wall gap variation. The statistics of the tempe

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2

Bugg, James Donald. "Flow distribution in adjacent subchannels of unequal size." Thesis, University of Ottawa (Canada), 1986. http://hdl.handle.net/10393/4732.

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3

Mohd, Amin Muhsin. "Instability and mixing of flow of supercritical water between subchannels." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/21431/.

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4

Cosby, Michael C. "Effects of support grid vane angles on single phase heat transfer within rod bundle subchannels." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1202419092/.

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5

Garkusha, Sergey, Haider Al-Janabi, and Aymen Al-Dulaimi. "Model of Distribution of Frequency Resource in the WiMAX Mesh-Network." Thesis, TCSET'2014, 2014. http://dspace.puet.edu.ua/handle/123456789/1956.

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The frequency resource distribution mathematical model is offered as a problem of subchannels’ number balancing between radio channels, which are formed by mesh-stations of the wireless network. The use of the offered model has made it possible to raise efficiency of the wireless mesh-network as a whole and ensure the “bottlenecks” absence

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6

Ahnesjö, Magnus. "Tomographic reconstruction of subchannel void measurements of nuclear fuel geometries." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-246288.

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The Westinghouse FRIGG loop in Västerås, Sweden, has been used to study the distribution of steam in the coolant flow of nuclear fuel elements, which is known as the void distribution. For this purpose, electrically heated mock-ups of a quarter BWR fuel bundles in the SVEA-96 geometry were studied by means of gamma tomography in the late 1990s. Several test campaigns were conducted, with good results, but not all the collected data was evaluated at the time. In this work, tomographic raw data of SVEA-96 geometry is evaluated using two different tomographic reconstruction methods, an algebraic

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7

Ouma, Barack Henry. "Experiments in rod bundle subchannel flows with varying rod-wall proximity." Thesis, University of Ottawa (Canada), 1988. http://hdl.handle.net/10393/5534.

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8

Wei, Junyi. "QoS-aware joint power and subchannel allocation algorithms for wireless network virtualization." Thesis, University of Essex, 2017. http://repository.essex.ac.uk/20142/.

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Wireless network virtualization (WNV) is a promising technology which aims to overcome the network redundancy problems of the current Internet. WNV involves abstraction and sharing of resources among different parties. It has been considered as a long term solution for the future Internet due to its flexibility and feasibility. WNV separates the traditional Internet service provider’s role into the infrastructure provider (InP) and service provider (SP). The InP owns all physical resources while SPs borrow such resources to create their own virtual networks in order to provide services to end

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9

Veloso, Marcelo Antonio. "Simulação computacional de eventos termo-hidraulicos transitorios em multicircuitos com multibombas." [s.n.], 2003. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267418.

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Orientadores: Roger Josef Zemp, Paulo de Carvalho Tofani<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-03T15:26:11Z (GMT). No. of bitstreams: 1 Veloso_MarceloAntonio_D.pdf: 10344720 bytes, checksum: e173f03cd07f8090cdc60aacf528de23 (MD5) Previous issue date: 2003<br>Resumo: O programa computacional P ANTERA-2 (Programa para Análise Termo-hidráulica de Reatores a Água, Versão 2), cujos fundamentos são descritos neste trabalho, efetua a análise por subcanais de feixes de varetas em conjunção com a simulação de mú

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10

Don, Armel. "Structure of Turbulent Flow in a Rod Bundle." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34154.

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The structure of turbulence in the subchannels of a large-scale 60 degree section of a CANDU 37-rod bundle was studied at Reynolds numbers equal to 50,000, 100,000 and 130,000. Measurements were conducted at roughly 33.81 rod diameters from the inlet of the rod bundle using single-point, two-component hot-wire anemometry. Analysis of the axial velocity signal indicated a weak effect of Reynolds number on the axial velocity distribution and a bulging of axial velocity contours toward the narrow gaps. The normalised normal Reynolds stresses and the normalised turbulent kinetic energy were found

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11

Pang, Bo [Verfasser]. "Numerical study of void drift in rod bundle with subchannel and CFD codes / Bo Pang." Karlsruhe : KIT Scientific Publishing, 2014. http://www.ksp.kit.edu.

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12

Adamsson, Carl. "Dryout and Power Distribution Effects in Boiling Water Reactors." Doctoral thesis, KTH, Reaktorteknologi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11343.

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Film flow measurements at several axial positions in round pipes with variousaxial power distributions are presented for conditions corresponding to normaloperation of a BWR. It is confirmed that the film flow rate approaches zero atthe onset of dryout. Selected phenomenological models of annular two-phaseflow are shown to reasonably reproduce the measurements. It is concluded thatmodels are in better agreement with measurements if terms corresponding topossible boiling induced entrainment are excluded. A method to perform film flow analysis in subchannels as a post-processto a standard two-fi

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13

Knebel, Miriam [Verfasser], and R. [Akademischer Betreuer] Stieglitz. "Advanced High-Fidelity Reactor Simulators Based on Neutron Transport and Subchannel Methodologies / Miriam Knebel ; Betreuer: R. Stieglitz." Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1137946539/34.

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14

Bednář, Michal. "Subkanálová analýza aktivní zóny jaderného reaktoru VVER-1000." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442466.

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This master’s thesis deals with boiling crisis and with departure from nucleate boiling ratio. This thesis explains terms like the boiling crisis in nuclear reactors and the thesis deals with individual parameters of the reactor core, which have an impact on departure from nucleate boiling ratio. After that, the thesis deals with subchannel analysis and describes basic mathematical and physical models of the chosen subchannel program. The thesis then processes, with the ALTHAMC12 subchannel program, the chosen parameters and their impact on departure from nucleate boiling ratio. The conclusion

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15

Duarte, Juliana Pacheco. "Um planejamento de experimentos para a avaliação do fluxo de calor crítico de reatores nucleares a água pressurizada de pequena escala." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-29042015-170748/.

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Um dos parâmetros termo-hidráulicos de segurança mais importantes no projeto e operação de reatores a água pressurizada é o fluxo de calor crítico (FCC). O FCC ocorre quando se atinge uma região de instabilidade na mudança de mecanismo de transferência de calor de uma parede aquecida para um fluido, aumentado drasticamente a temperatura da parede. Transientes em um reator nuclear podem afetar a taxa de geração de calor ou a fluxo de refrigerante no núcleo, prejudicando a retirada de calor das varetas combustíveis. Conhecer o FCC nestas condições é essencial para evitar danos às varetas e, cons

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Prusek, Thomas. "Modélisation et simulation numérique du colmatage à l’échelle du sous-canal dans les générateurs de vapeur." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4333/document.

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Ce travail de thèse s'inscrit dans le cadre d'un projet de recherche industriel visant à améliorer les méthodes et les outils de simulation du comportement thermohydraulique et vibratoire dans les générateurs de vapeur des centrales nucléaires, en présence de colmatage. Le colmatage des générateurs de vapeur est un phénomène de déposition de matières au niveau d'interstices, appelés passages foliés, qui perturbe la libre circulation de l'écoulement appartenant au circuit secondaire. L'objectif de ces travaux de thèse est de disposer d'un modèle permettant de simuler ce phénomène dans l'intégra

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Wen-ShuoZhuang and 莊文碩. "Modular split-and-recombine micromixers with swirl-inducing subchannels." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7y2764.

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18

Ananya, S. N. "On The Best-m Feedback Scheme In OFDM Systems With Correlated Subchannels." Thesis, 2015. https://etd.iisc.ac.in/handle/2005/2637.

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Orthogonal frequency division multiplexing (OFDM) in next generation wireless systems provides high downlink data rates by employing frequency-domain scheduling and rate adaptation at the base station (BS). However, in order to control the significant feedback overhead required by these techniques, feedback reduction schemes are essential. Best-m feedback is one such scheme that is implemented in OFDM standards such as Long Term Evolution. In it, the sub channel (SC) power gains of only the m strongest SCs and their corresponding indices are fed back to the BS. However, two assumptions perva

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Ananya, S. N. "On The Best-m Feedback Scheme In OFDM Systems With Correlated Subchannels." Thesis, 2015. http://etd.iisc.ernet.in/handle/2005/2637.

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Orthogonal frequency division multiplexing (OFDM) in next generation wireless systems provides high downlink data rates by employing frequency-domain scheduling and rate adaptation at the base station (BS). However, in order to control the significant feedback overhead required by these techniques, feedback reduction schemes are essential. Best-m feedback is one such scheme that is implemented in OFDM standards such as Long Term Evolution. In it, the sub channel (SC) power gains of only the m strongest SCs and their corresponding indices are fed back to the BS. However, two assumptions pervad

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20

Hansel, Joshua Edmund. "Solution Techniques for Single-Phase Subchannel Equations." Thesis, 2013. http://hdl.handle.net/1969.1/149451.

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A steady-state, single phase subchannel solver was created for the purpose of integration into a multi-physics nuclear fuel performance code. Since applications of such a code include full nuclear reactor core flow simulation, a thorough investigation of efficient solution techniques is a requirement. Execution time profiling found that formation of the Jacobian matrix required by the nonlinear Newton solve was found to be the most time-consuming step in solution of the subchannel equations, so several techniques were tested to minimize the time spent on this task, such as finite difference a

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Kao, Ming-chun, and 高明駿. "Improved Inter-subchannel Interference Cancellation for OFDM Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/24417565188653417503.

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碩士<br>國立成功大學<br>電腦與通信工程研究所<br>96<br>Orthogonal frequency-division multiplexing (OFDM) transmission is widely known as an efficient communication technique. In multi-path fading channels, one OFDM symbol is composed of several narrowband sub-channel signals, and it has a long time duration. By adding guard intervals longer than the maximum channel delay between OFDM symbols, OFDM can completely remove the inter-symbol interference (ISI). In the mobile communication, time-variance of channel is a reasonable assumption. Under this assumption, the orthogonality among sub-channels may be loss. In t

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吳芳儀. "PAPR Reduction for OFDM Systems Using Subchannel Peak Reduction." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/65864150436878314660.

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碩士<br>國立交通大學<br>電機與控制工程系所<br>96<br>Recently there has been great interest in the Orthogonal Frequency Division Multiplexing (OFDM) systems. However one disadvantage of OFDM systems is high peak-to-average power ratio (PAPR). In this thesis, we will propose a new method called Subchannel Peak Reduction (SPR). The symbols of a few selected subchannels are chosen to multiple a rotation individually so that PAPR is reduced. Transmission rate is slightly lower. However, no side information bit is needed. The optimal solution of the rotation can be found by exhaustive search (SPR-ES).We will propose

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23

Tang, Chih-Yuan, and 湯智淵. "Envy-Free Subchannel Allocation Mechanism in SC-FDMA Environments." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/99476688408290074979.

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碩士<br>國立中央大學<br>通訊工程學系<br>102<br>Nowadays, thanks to the evolution of mobile communication, number of mobile equipment is increasing and bandwidth is also growing. Communication research want to find how to achieve maximum throughput in the limited bandwidth. But, fairness between users was talk about rarely in studies. It’s an important issue under the trend of increasing mobile communication users. 3GPP LTE uses single-carrier frequency division multiple access（SC-FDMA）architecture for the uplink. Unlike Orthogonal frequency division multiple access（OFDMA）, SC-FDMA add a pre-coder FFT. This

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Lin, How-min, and 林浩民. "Heterogeneous Subchannel Sharing with Budget Constraint in Cognitive Radio Networks." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/57386138269520353169.

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碩士<br>國立中央大學<br>通訊工程學系<br>101<br>Cognitive radio network is a novel commutation paradigm in recent years which can significantly improve the spectrum utilization. In this paper, we consider a cognitive radio network model consisting of a primary owner (PO), multiple primary users (PU) and multiple secondary users (SU). We design an auction-based spectrum allocation mechanism where the SUs bid to purchase the spectrum bands from the PO who acts as the auctioneer. Existing auction-based spectrum allocation mechanisms mostly assume the spectrum bands are homogenous. However, we consider the heter

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Lv, Nan. "Performance analysis of greedy subchannel allocation schemes for adaptive OFDMA systems." Thesis, 2010. http://hdl.handle.net/1828/2953.

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Subchannel allocation schemes for OFDMA (orthogonal frequency division multiple access) systems with adaptive transmission are investigated. The analysis involves two scenarios: single-hop transmission and dual-hop relaying transmission. The overall objective is to utilize minimum system resource (in terms of subchannel) while satisfying scheduled users' data rate requirements under a certain error rate performance restriction. The ordered subchannel selection with adaptive modulation scheme is applied to both cases. In single-hop case, a low-complexity greedy subchannel allocation algorithm w

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Luo, Sin-Yu, and 羅心妤. "D2D communications with subchannel reusing for throughput-guaranteed relay selection in LTE." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/07953288986910152180.

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碩士<br>國立中興大學<br>資訊科學與工程學系<br>105<br>Full-duplex relaying, which allows relays to transmit and receive signals simultaneously, is a key technique to provide better quality of service and to extend coverage of LTE base station(BS) service in 5th generation mobile networks(5G) networks. Due to the increasing demands for more system capacity and higher data rate, it is essential to design a throughput-guaranteed and power-aware relay selection mechanism so that services can be successfully accomplished within tolerable power consumption. It is also imperative to prevent cellular users from interfe

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Heng-Yi, Wu. "Queueing-Aware Weighted-Round-Robin Subchannel Allocation for Multi-service OFDM Systems." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0005-2201200714012900.

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Liao, Chih-Yao, and 廖志耀. "Adaptive Subchannel Allocation and Admission Control for the IEEE 802.16 OFDMA Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/53626319553898951870.

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碩士<br>國立暨南國際大學<br>電機工程學系<br>97<br>The IEEE 802.16 provides high-speed wireless access in Metropolitan Area Network. In order to use bandwidth resource efficiently and guarantee QoS requirement of real-time service, adaptive subchannel allocation and admission control are necessary. However, methods for adaptive subchannel allocation and admission control were not defined in the standard. Therefore, feasible adaptive subchannel allocation and admission control algorithms are very important. In this thesis, we present an adaptive subchannel allocation and admission control method for real-ti

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Huang, Shih-Syuan, and 黃士軒. "An E±cient Subchannel Based Method for Peak Reduction in OFDM Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/24273869946005356245.

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碩士<br>國立交通大學<br>電機與控制工程系所<br>97<br>In this paper, we propose a low-cost PAPR (peak to average power ratio) reduction method called SPR (subchannel peak reduction) method that requires no side information for OFDM (Orthogonal Frequency Di- vision Multiplexing) systems. We select a small number of subchannels, called PR (peak reduction) subchannels, to reduce peak value of the trans- mitter output. The constellation on the PR subchannels are extended to twice the size. The enlarged constellation oRers freedom in bit-to-symbol mapping, which will be exploited for peak reduction. Although the tran

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Cheng-FengLin and 林正豐. "Equalizer Design for FBMC/OQAM Systems by Incorporating Inter-Subchannel Interference Cancellation." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/d6h9y5.

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Hsieh, Tzung-Han, and 謝宗翰. "Channel-Aware Subchannel Renumbering and Downlink Burst Allocation for IEEE 802.16 OFDMA System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/08682878627146548053.

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碩士<br>淡江大學<br>資訊工程學系碩士班<br>97<br>This paper proposes a channel-aware downlink resource management scheme in IEEE 802.16 OFDMA system. The scheme is composed of two mechanisms: subchannel renumbering mechanism and burst allocation mechanism, for throughput gains and control message overhead reduction, respectively. Due to the variation of channel conditions, each MS in each subchannel has different receiving condition. BS is expected to transmit data to each MS in good subchannels. Thus, more bursts result in a large burst overhead in the form of DL-MAP. By subchannel renumbering mechanism, the

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Shih-ChiLiao and 廖思齊. "A Non-Extended Scheme for Inter-Subchannel Interference Self-Reduction in the OFDM System." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/71273602851074338654.

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碩士<br>國立成功大學<br>電腦與通信工程研究所<br>103<br>Inter-subchannel interference (ICI) is an important problem for the orthogonal frequency-division multiplexing (OFDM) system in the fast time-varying channel. It limits the achievable bit-error rate (BER) at high signal-to-noise ratio (SNR). The ICI problem has caused much concern for the OFDM system. The effect of ICI may come from carrier frequency shift or the high-mobility (fast time-varying) channel. The first one can be solved by the frequency compensation, which, however, cannot be applied to solve the ICI caused by the fast time-varying channel. In

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Tsung-HengChiang and 江宗衡. "Inter-Subchannel Interference Self-Reduction for the Single-Carrier Block Transmission with Frequency-Domain Equalization." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/53191910267680107220.

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碩士<br>國立成功大學<br>電腦與通信工程研究所<br>102<br>Traditional Single-Carrier (SC) transmission may be not suitable for a high rate wireless transmission, because it requires high-complexity equalization for frequency-selective channels to remove the inter-symbol interference. But under the pre-coded OFDM architecture, we can achieve SC block transmission with frequency-domain (FD) equalization. However, just like the OFDM system, there exists interference among subchannels for fast time-varying channels. Due to this inter-subchannel interference (ICI), we cannot reduce the bit-error rate (BER) by increasin

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Yeh, Fang-ting, and 葉芳廷. "Game theory for power and subchannel allocation with subcarrier pairing in multiuser OFDM relay networks." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/50266013169530290090.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>102<br>Orthogonal frequency division multiplexing (OFDM) is a promising wireless communication transmission technology; whereas, cooperative networks can provide spatial diversity gain by a distributed antenna array between the user and the destination. In this thesis, we consider a resource allocation problem, including power and subchannel allocation, and subcarrier pairing, in OFDM cooperative networks, in which user passes message through a set of subchannels, so that it can get lower bit error rate and attain higher transmission data rate. Game theory, originat

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Ching-YuChung and 鍾景宇. "An Efficient Algorithm of Inter-Subchannel Interference Self-Reduction for the Single-Carrier Block Transmission." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/10169964846231730945.

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碩士<br>國立成功大學<br>電腦與通信工程研究所<br>101<br>In the fast time-varying channel, there exists interference among subchannels of the orthogonal frequency division multiplexing (OFDM) system. Due to this inter-subchannel interference (ICI), we cannot improve the bit-error rate (BER) signal-to-noise ratio (SNR) increases. The problem of ICI also appears in the single-carrier (SC) block transmission with frequency-domain (FD) equalization. However, not all ICI reduction algorithms for the OFDM system can be directly applied in the SC block transmission system. In the thesis, we consider some ICI reducti

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Avramova, Maria Ivanov Kostadin N. "Development of an innovative spacer grid model utilizing computational fluid dynamics within a subchannel analysis tool." 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2320/index.html.

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Chiang, Chih-Ping, and 江致平. "A Subchannel-Aware Variable-Length Burst Scheduling Algorithm for Downlink Traffic in IEEE 802.16m OFDMA Systems." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/69293511901953222149.

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碩士<br>淡江大學<br>資訊工程學系資訊網路與通訊碩士班<br>99<br>Burst is an atomic bandwidth allocation unit in IEEE 802.16m OFDMA system. Each burst is composed of subchannels and OFDMA symbol time. This paper investigates the downlink burst allocation problem (BAP) in IEEE 802.16 OFDMA systems. In order to solve this problem, this paper proposes a subchannel-aware Variable-Length Burst Scheduling (VLBS) algorithm for throughput gains and control overhead alleviations, to schedule the position of each burst based on the rectangular mapping constraint. VLBS contains two vital schemes, including the burst allocation s

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Ching-LinWei and 魏敬霖. "On the Inter Subchannel Interference Reduction for Single-Carrier Block Transmission Systems with Frequency-Domain Equalization." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/65153111628806707427.

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碩士<br>國立成功大學<br>電腦與通信工程研究所<br>100<br>Inter-subchannel interference (ICI) is an important problem for the orthogonal frequency-division multiplexing (OFDM) system in the fast time-varying channel. It limits the achievable bit-error rate (BER) at high signal-to-noise ratio (SNR). The ICI problem has caused more concerns recently. The ICI problem also occurs in the single-carrier (SC) frequency-domain equalization (FDE) system. There are two main causes of ICI, including the carrier frequency shift and the high-mobility (fast time-varying) channel. In this thesis, we focus on the second one.

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Chen, Chun-Hong, and 陳俊宏. "Subchannel-aware IPTV Multicast Grouping and Resource Allocation Mechanisms for Bandwidth Utilization Improvement in IEEE 802.16 WiMAX." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/18164526486710998199.

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碩士<br>淡江大學<br>資訊工程學系碩士班<br>101<br>This paper investigates multicast resource allocation problem for IPTV services in WiMAX networks and proposes a subchannel-aware IPTV multicast grouping and resource allocation mechanisms (MGRAM) for bandwidth utilization improvement. In the proposed mechanism, both system profits and user satisfactions are considered to form a system performance weight for multicast group partition and resource allocation. In multicast group partition, this paper separates users with bad subchannel conditions from the original multicast group, which is grouped based on the s

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Chen, Cing-Lin, and 陳磬霖. "A Subchannel-aware Burst Fragmentation, Packing and Scheduling (BFPS) Algorithm for Downlink Traffic in IEEE 802.16 OFDMA Systems." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/81264868276477722474.

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碩士<br>淡江大學<br>資訊工程學系碩士班<br>98<br>Burst is an atomic bandwidth allocation unit in IEEE 802.16 OFDMA system. Each burst is composed of subchannels and symbol time. This paper investigates the downlink burst scheduling problem (BSP) in IEEE 802.16 OFDMA systems. In order to solve this problem, this paper proposes a subchannel-aware burst fragmentation, packing and scheduling (BFPS) algorithm for throughput gains and control overhead alleviations, to schedule the position of each burst based on the rectangular mapping constraint. BFPS contains three vital schemes, including the burst allocation sc

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