Dissertations / Theses on the topic 'Multistable structures'
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Santer, Matthew James. "Design of multistable structures." Thesis, University of Cambridge, 2006. https://www.repository.cam.ac.uk/handle/1810/252021.
Full textCui, Yuefeng. "Adaptive multistable flexible composite structures." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/25513.
Full textNorman, Alexander David. "Multistable and morphing corrugated shell structures." Thesis, University of Cambridge, 2009. https://www.repository.cam.ac.uk/handle/1810/244988.
Full textHaldar, Ayan [Verfasser]. "Multistable morphing structures using variable stiffness laminates / Ayan Haldar." Hannover : Gottfried Wilhelm Leibniz Universität, 2020. http://d-nb.info/1216995230/34.
Full textHeymanns, Matthias. "Multistable Structures for Broad Bandwidth Vibration-based Energy Harvesters: An Analytical Design Investigation." Phd thesis, Studienbereich Mechanik, Technische Universität Darmstadt, 2015. https://tuprints.ulb.tu-darmstadt.de/5333/1/Dissertation_Heymanns.pdf.
Full textHeymanns, Matthias [Verfasser], Peter [Akademischer Betreuer] Hagedorn, and Bernhard [Akademischer Betreuer] Schweizer. "Multistable Structures for Broad Bandwidth Vibration-based Energy Harvesters: An Analytical Design Investigation / Matthias Heymanns. Betreuer: Peter Hagedorn ; Bernhard Schweizer." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://d-nb.info/1112268979/34.
Full textBoddepalli, Srinivasarao. "Enhancement of field emission from multistage structure of carbon nanotube arrays." FIU Digital Commons, 2007. http://digitalcommons.fiu.edu/etd/1708.
Full textRahman, Mohammad Shafiqur. "Characterising the Deformation Behaviour of Unbound Granular Materials in Pavement Structures." Doctoral thesis, KTH, Väg- och banteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-162277.
Full textQC 20150325
Koff, Andrew (Andrew Steven). "Tip clearance effects on multistage axial compressor performance and flow structure for small core application." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108933.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 241-245).
This thesis describes the effect of increasing multistage axial compressor rotor blade tip clearance on embedded stage performance and flow structure for clearance-to-span ratios ranging from 1.4% to 5.6% using steady and unsteady three-dimensional viscous flow multistage computations. Embedded stage efficiency displays decreased sensitivity as rotor tip clearance increases with two flow regimes. For clearance-to-span ratios less than 3.6%, a nearly linear decrease in stage efficiency of 1.6 points per 1% increase in clearance-to-span is identified, in agreement with published literature. For clearance-to-span ratios greater than 3.6%, the computed stage efficiency decreases at a rate of 0.5 points per 1% increase in clearance-to-span. A parameter is developed that correlates with rotor tip section loss generation over a range of rotor tip clearance-to-span ratios and flow coefficients. The blade row relative streamwise tip section blockage increases in both rotor and stator passages and follows trends in rotor and stator tip section loss generation with rotor tip clearance. The tip section velocity deficit into the stator increases with tip clearance resulting in stator suction side corner flow separation, creating a challenge to design a high efficiency stage with larger tip clearance.
by Andrew Koff.
S.M.
Hamouche, Walid. "Contrôle de forme de coques multistables : modélisation, optimisation et mise en œuvre." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066541/document.
Full textThis work is essentially based on the phenomenon of multistability of thin structures as plates and shells and some associated applications. The work is divided in two parts. The first part aims to study theoretically, numerically and experimentally the multistability of thin orthotropic shallow shells with uniform curvature. We show notably that such a shell, when submitted to the combination of initial curvature and pre-stresses sufficiently high, possesses up to three stable states towards the choice of the material. First, we propose criteria to design and manufacture multistable shells up to tristability ; this work is validated by finit element simulations and experiments. After, we apply those criteria to the design and manufacture ofcylindrical multistable shells for which the energetic gap between stable states is minimal. The second part is dedicated to direct applications of bistability of thin cylindrical bistable shells with low energetic gap. We first propose an application on shape control via the use of active materials which we bond on the structure. This includes a first phase of theoretical design of both the structure and the actuation law, and a second phase of experimental demonstration. After, we study both theoretically and experimentally the non-linear dynamic properties of such structures with the aim to highlight the different modes of oscillations intrinsic to an external excitation source. Finally, we propose an application to non-linear broadband energy harvesting from vibrations based on multistable piezoelectric excited shells
Ben, Hadj Fredj Abir. "Computations for the multiple access in wireless networks." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLT030.
Full textFuture generations of wireless networks pose many challenges for the research community. In particular, these networks must be able to respond, with a certain quality of service, to the demands of a large number of connected people and objects. This drives us into quite important requirements in terms of capacity. It is within this framework that non-orthogonal multiple access methods (NOMA) have been introduced. In this thesis, we have studied and proposed a multiple access method based on the compute and forward technique and on Lattice codes while considering different lattice constructions. We have also proposed improvements to the algorithm for decoding the Sparse code multiple access (SCMA) method based on Lattice codes. In order to simplify the multi-stage decoders used in here, we have proposed simplified expressions of LLRs as well as approximations. Finally, we studied the construction D of lattices using polar codes. This thesis was in collaboration with the research center of Huawei France
Dumontier, Rodolphe. "Ingénierie métabolique de la voie de N-Glycosylation chez la diatomée Phaeodactylum tricornutum Towards deciphering structural features of the oligomannoside isomers of N-glycans in the diatom, Phaeodactylum tricornutum using a combination of cutting-edge mass spectrometry techniques User-friendly extraction and!multistage tandem mass spectrometry based analysis of!lipid-linked oligosaccharides in!microalgae Toward future engineering of the N-glycosylation pathways in microalgae for optimizing the production of biopharmaceuticals." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR021.
Full textCurrently, monoclonal antibodies represent the major class of recombinant proteins used for therapeutical applications in humans. The constraints due to the production of these monoclonal antibodies in mammalian cells led scientists to develop alternative expression system for the production of monoclonal antibodies. Recently, microalgae have been shown to be able to produce functional monoclonal antibodies. However, the engineering of the N-glycosylation pathway in these microalgae is required in order to optimize the effector functions of the algae-made antibody for some therapeutic applications. In this context, this PhD thesis focused on the study of the N-glycosylation of the diatom Phaeodactylum tricornutum. Initially, we focused on the structural analysis of the oligosaccharide precursor synthesized in the endoplasmic reticulum. The results showed that P.tricornutum synthesizes a truncated precursor as compared to the other eukaryotes. Then, I have investigated the detailed structure of the oligomannosidic N-glycans and demonstrated that the Man9GlcNAc2 and Man5GlcNAc2 synthesized were similar to those found in mammals. In addition, the Man5GlcNAc2 synthesized is the acceptor isomer for the N-cetylglucosaminyltransferase I (GnT I) which initiates in eukaryotes the synthesis of complex-type N-glycans. Humanization of the N-glycosylation pathway was finally iinitiated by over-expression of the GnT I in the diatom in order to increase the amounts of complex N-glycans carrying N-acetylglucosamine residues in the terminal position
黃致惟. "Implementation of K-Best sphere decoder based on multistage tree structure." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/54104381943249526706.
Full text國立交通大學
電機與控制工程系所
96
In multiple-input multiple-output (MIMO) communication systems Maximum- Likelihood detection is the preferred detection method which achieves the optimal performance. However, the main drawback of Maximum-Likelihood detection is that it suffers from exponential computational complexity against the number of antennas and signal modulation methods. Thus we consider K-Best algorithm based on the breadth-first tree search. The K-Best algorithm provides near-ML performance while its computational complexity is reduced compared to the Maximum-Likelihood detection. This thesis proposes the multistage K-Best algorithm in MIMO systems. In the proposed method, we decompose higher order constellation into several lower order constellations and apply ordering of lower order constellation to reduce the probability of missing the Maximum-Likelihood solution. It can be seen that the multistage K-Best algorithm and conventional K-Best algorithm achieve almost identical PER performance at the same K value. However, the multistage K-Best algorithm is shown to achieve such performance with a significantly lower computational complexity compared to the conventional K-Best algorithm. At the same time the VLSI architecture for the implementation of the multistage K-Best algorithm based on 0.18-μm technology is presented.
Lin, Chien-Chou, and 林建州. "A Cost-effective Fault-tolerant Combining Structure for Multistage interconnection network." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/76865427740593472601.
Full text國立交通大學
資訊科學學系
82
For a shared-memory multiprocessor system, the multistage inter- connection network ( MIN )is a high-bandwidth and cost- effective choice among the various interconnection schemes. However , the pure MIN has two properties : (i) There is only a single path between any PP-MM (processing element and memory module ) pair. ( ii ) A link is always shared by multiple PE-MM paths . The problems of the fault-tolerance and the hot-spot contention caused by the above two properties may seriously degrade the system performance.A binary tree based combining network for MIN was proposed to solvethe hot spot contention.This cost-effective scheme can solve hot spot contention efficiently, but the binary tree sturcture has a poor fault-tloerant capability . In this thesis a modified fault-tolerant binary tree called Jump Tree is proposed. The reliability of the tree structure is enhanced by adding some redundant links and multiplexers. Furthermore , we propose an integrated MIN design which has a fault-tolerant MIN (chained network ) and a fault-tolerant and cost-effective combining network (Jump Tree).The chained network can handle the nonuniform traffic spots for the regular routing the Jump Tree can combine the hot-spot packets efficiently and reliably. The Jump Tree based combining MIN has a five time increases in the reliabilty compared with that based on a binary tree. The average delay of our design is also shorter than the chained combining network's.
Xu, Yue-Ji, and 許耀基. "The study on the physical properties and structure of melting spinning and multistage drawing high density polyethylene fiber." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/40550294370473943413.
Full textChen, Ling-Yin. "An investigation of the optimal test design for multi-stage test using the generalized partial credit model." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-12-344.
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