Relevant bibliographies by topics / Light Harvesting Systems

Academic literature on the topic 'Light Harvesting Systems'

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Published: 7 September 2023

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Journal articles on the topic "Light Harvesting Systems"

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FOX, MARYE ANNE, WAYNE E. JONES, and DIANA M. WATKINS. "Light-Harvesting Polymer Systems." Chemical & Engineering News 71, no. 11 (March 15, 1993): 38–48. http://dx.doi.org/10.1021/cen-v071n011.p038.

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Reineker, P., Ch Warns, Ch Supritz, and I. Barvík. "Exciton dynamics in light harvesting systems." Journal of Luminescence 102-103 (May 2003): 802–6. http://dx.doi.org/10.1016/s0022-2313(02)00645-2.

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Chen, Lipeng, Prathamesh Shenai, Fulu Zheng, Alejandro Somoza, and Yang Zhao. "Optimal Energy Transfer in Light-Harvesting Systems." Molecules 20, no. 8 (August 20, 2015): 15224–72. http://dx.doi.org/10.3390/molecules200815224.

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Fleming, Graham R., and Rienk van Grondelle. "Femtosecond spectroscopy of photosynthetic light-harvesting systems." Current Opinion in Structural Biology 7, no. 5 (October 1997): 738–48. http://dx.doi.org/10.1016/s0959-440x(97)80086-3.

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Vollmer, Martin S., Frank Würthner, Franz Effenberger, Peter Emele, Dirk U. Meyer, Thomas Stümpfig, Helmut Port, and Hans C. Wolf. "Anthryloligothienylporphyrins: Energy Transfer and Light-Harvesting Systems." Chemistry - A European Journal 4, no. 2 (February 10, 1998): 260–69. http://dx.doi.org/10.1002/(sici)1521-3765(19980210)4:2<260::aid-chem260>3.0.co;2-9.

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Ensslen, Philipp, Fabian Brandl, Sabrina Sezi, Reji Varghese, Roger-Jan Kutta, Bernhard Dick, and Hans-Achim Wagenknecht. "DNA-Based Oligochromophores as Light-Harvesting Systems." Chemistry - A European Journal 21, no. 26 (June 9, 2015): 9349–54. http://dx.doi.org/10.1002/chem.201501213.

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Calderón, Leonardo F., and Leonardo A. Pachón. "Nonadiabatic sunlight harvesting." Physical Chemistry Chemical Physics 22, no. 22 (2020): 12678–87. http://dx.doi.org/10.1039/d0cp01672a.

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Thilagam, A. "Natural light harvesting systems: unraveling the quantum puzzles." Journal of Mathematical Chemistry 53, no. 2 (November 22, 2014): 466–94. http://dx.doi.org/10.1007/s10910-014-0442-x.

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Chmeliov, Jevgenij, Gediminas Trinkunas, Herbert van Amerongen, and Leonas Valkunas. "Excitation migration in fluctuating light-harvesting antenna systems." Photosynthesis Research 127, no. 1 (January 22, 2015): 49–60. http://dx.doi.org/10.1007/s11120-015-0083-3.

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Ma, Xinyu, Sebastian Bader, and Bengt Oelmann. "Power Estimation for Indoor Light Energy Harvesting Systems." IEEE Transactions on Instrumentation and Measurement 69, no. 10 (October 2020): 7513–21. http://dx.doi.org/10.1109/tim.2020.2984145.

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Dissertations / Theses on the topic "Light Harvesting Systems"

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Stevens, Amy L. "Energy transfer processes in supramolecular light-harvesting systems." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:43833f3a-96b0-432a-9608-8f08a9096be7.

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This dissertation attempts to understand how energy transfer in a molecular wire and a spherical organic assembly are affected by molecular structure. The molecular wire is a DNA-hybrid structure composed of a strand of thymine bases appended by a cyanine dye. Hydrogen bonded to each base is a naphthalene-derivative molecule. Using time-integrated photoluminescence and time-correlated single photon counting measurements, energy transfer from the naphthalene donors to the cyanine acceptors was confirmed, and its dependence on temperature and DNA-template length investigated. Donor-thymine bonding was disrupted at temperatures above about 25 degrees Celcius resulting in poor donor template decoration and low rates of energy transfer. Increasing numbers of donors attach to the scaffold, forming an orderly array, as the template length increases due to the stabilising effects of the donor-donor pi-stacking interactions. Conversely, modelled energy transfer rates fall as the scaffold length increases because of the longer donor-acceptor distances involved. Therefore, the energy transfer rate was greatest for a template built from 30 thymines. The spherical organic assemblies (nanoparticles) are formed by fast injection of a small volume of molecularly dissolved fluorene-derivative amphiphilic molecules into a polar solvent. The amphiphilic molecules contained either a naphthalene (donor) or a benzothiadiazole (acceptor) core. The donor-acceptor mixed nanoparticles resemble an amorphous polymer film and were modelled as such using the Foerster resonance energy transfer theory. The Foerster radii extracted from the measurements depends intricately on the donor-acceptor spectral overlap and distance. The latter effect was controlled by the stacking interactions between the molecules. Altering the morphology of the structural units is the key to optimising energy transfer in molecular structures. To achieve efficient organic molecule-based devices, the importance of this property needs to be fully appreciated and effectively exploited.
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Huang, Xia. "Fabrication of artificial light-harvesting systems for energy transfer studies." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/21488/.

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Molukanele, Palesa Patricia. "Dynamics of energy transfer in light harvesting photosynthetic systems / P. Molukanele." Thesis, North-West University, 2009. http://hdl.handle.net/10394/5101.

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Photosynthesis is the process by which plants, algae and photo synthetic bacteria convert sunlight energy into chemical energy (ATP). The initial stages of this process (harvesting solar energy and transferring it to the reaction centres) occur extremely fast and with an efficiency of close to 100%. Studying the dynamics of these reactions will enable us to develop artificial functional light harvesting arrays and energy transfer systems that mimic the process in nature, thus helping us use light as an energy source that is environmentally clean, efficient, sustainable and carbon-neutral. These reactions can be measured using femtosecond pump-probe spectroscopy (transient absorption in the liquid phase and monitoring the subsequent kinetics in the wavelength region: 400 nm-700 nm). In order to perform these experiments, photo synthetic pigment-protein complexes must be isolated, purified and characterised. In this work, these photo synthetic complexes were isolated from spinach leaves and characterised using various biological and spectroscopic techniques. Finally, the first results of pump-probe application to biological samples in South Africa were discussed.
Thesis (M.Sc. (Environmental Sciences))--North-West University, Potchefstroom Campus, 2009.
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Gullo, Maria Pia <1987&gt. "Photophysical investigation of light-harvesting systems for solar-to-fuel conversion." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6927/1/Gullo_Maria_Pia_Tesi.pdf.

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In recent years, an increasing attention has been given to the optimization of the performances of new supramolecular systems, as antennas for light collection. In such background, the aim of this thesis was the study of multichromophoric architectures capable of performing such basic action. A synthetic antenna should consist of a structure with large UV-Vis absorption cross-section, panchromatic absorption, fixed orientation of the components and suitable energy gradients between them, in order to funnel absorbed energy towards a specific site, through fast energy-transfer processes. Among the systems investigated in this thesis, three suitable classes of compounds can be identified: 1) transition metal-based multichromophoric arrays, as models for antenna construction, 2) free-base trans-A2B-phenylcorroles, as self-assembling systems to make effective mimics of the photosynthetic system, and 3) a natural harvester, the Photosystem I, immobilized on the photoanode of a solar-to-fuel conversion device. The discussion starts with the description of the photophysical properties of dinuclear quinonoid organometallic systems, able to fulfil some of the above mentioned absorption requirements, displaying in some cases panchromatic absorption. The investigation is extended to the efficient energy transfer processes occurring in supramolecular architectures, suitably organized around rigid organic scaffolds, such as spiro-bifluorene and triptycene. Furthermore, the photophysical characterization of three trans-A2B-phenylcorroles with different substituents on the meso-phenyl ring is introduced, revealing the tendency of such macrocycles to self-organize into dimers, by mimicking natural self-aggregates antenna systems. In the end, the photophysical analysis moved towards the natural super-complex PSI-LHCI, immobilized on the hematite surface of the photoanode of a bio-hybrid dye-sensitized solar cell. The importance of the entire work is related to the need for a deep understanding of the energy transfer mechanisms occurring in supramolecules, to gain insights and improve the strategies for governing the directionality of the energy flow in the construction of well-performing antenna systems.
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Gullo, Maria Pia <1987&gt. "Photophysical investigation of light-harvesting systems for solar-to-fuel conversion." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6927/.

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In recent years, an increasing attention has been given to the optimization of the performances of new supramolecular systems, as antennas for light collection. In such background, the aim of this thesis was the study of multichromophoric architectures capable of performing such basic action. A synthetic antenna should consist of a structure with large UV-Vis absorption cross-section, panchromatic absorption, fixed orientation of the components and suitable energy gradients between them, in order to funnel absorbed energy towards a specific site, through fast energy-transfer processes. Among the systems investigated in this thesis, three suitable classes of compounds can be identified: 1) transition metal-based multichromophoric arrays, as models for antenna construction, 2) free-base trans-A2B-phenylcorroles, as self-assembling systems to make effective mimics of the photosynthetic system, and 3) a natural harvester, the Photosystem I, immobilized on the photoanode of a solar-to-fuel conversion device. The discussion starts with the description of the photophysical properties of dinuclear quinonoid organometallic systems, able to fulfil some of the above mentioned absorption requirements, displaying in some cases panchromatic absorption. The investigation is extended to the efficient energy transfer processes occurring in supramolecular architectures, suitably organized around rigid organic scaffolds, such as spiro-bifluorene and triptycene. Furthermore, the photophysical characterization of three trans-A2B-phenylcorroles with different substituents on the meso-phenyl ring is introduced, revealing the tendency of such macrocycles to self-organize into dimers, by mimicking natural self-aggregates antenna systems. In the end, the photophysical analysis moved towards the natural super-complex PSI-LHCI, immobilized on the hematite surface of the photoanode of a bio-hybrid dye-sensitized solar cell. The importance of the entire work is related to the need for a deep understanding of the energy transfer mechanisms occurring in supramolecules, to gain insights and improve the strategies for governing the directionality of the energy flow in the construction of well-performing antenna systems.
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Roth, Johannes S. "Light harvesting in low dimensional systems : application of driven Brownian ratchets in supported lipid bilayers for the creation of light harvesting mimics." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/8626/.

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Supported lipid bilayers are a well known model system for the cell membrane. They allow for the investigation of the membrane in a controlled environment. The solid supported bilayer is accessible through the surface it is formed on and allows for different experimental techniques to be applied. This thesis presents work on free diffusion in the membrane and electrophoretically driven transport concentration of charged membrane components. In addition to that, novel supports for the support of membrane proteins have been investigated and surface enhanced Raman spectroscopy is presented as a label-free method for the detection of membrane components. Brownian ratchets have been used for applications such as molecular sorting with and without the use of lipid bilayers. So far the work has mainly been focussed on their use without a thorough investigation of their properties and the parameters influencing their efficiency. Here, the size and time parameters are varied in experiment and calculation and their role in the ratcheting process is discussed. The efficiency of the ratchets can be significantly reduced when the parameters are chosen in an optimal manner. The use of electrophoresis in lipid bilayers for the concentration and separation of membrane components has focussed on using two electrodes in simple patterns such as squares or lines. This is expanded here on more complex patterns which also allow for the retention of charged material in trapping regions. The pattern was then used to demonstrate the ability to determine binding coefficients in the trapping regions even for membrane components with a low initial concentration or low fluorescence quantum yield. More complex electrode systems using four patterned electrodes are also presented which allow for the application of electric fields in two dimensions where the strength and orientation of the field can be chosen almost arbitrarily. Polymer supports have the ability to support lipid bilayers with membrane proteins which exhibit significant extramembranous domains. Two novel supports are investigated here and different lipid bilayer formation routes are explored. To allow for label free detection of lipids, peptides or proteins within the membrane, surface enhanced Raman spectroscopy is used. The ability of this method to distinguish between different lipids and to detect peptides within the membrane is shown, as well.
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Dietzek, Benjamin. "Ultrafast linear and non-linear spectroscopy from biological light receptors to artificial light harvesting systems /." Doctoral thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=978743733.

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Bhise, Anil Dnyanoba. "A biomimetic approach for synthesizing artificial light-harvesting systems using self-assembly." Karlsruhe : FZKA, 2004. http://bibliothek.fzk.de/zb/berichte/FZKA7174.pdf.

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Bhise, Anil Dnyanoba. "A biomimetic approach for synthesizing artificial light-harvesting systems using self-assembly /." Karlsruhe : Forschungszentrum, 2005. http://www.gbv.de/dms/bs/toc/503994367.pdf.

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Univ., Diss.--Karlsruhe, 2005.
Auch als elektronische Ressource vorh. Literaturverz. S. 126 - 133. Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden. Zsfassung in dt. Sprache.
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Valleau, Stephanie. "Theoretical study of exciton transport in natural and synthetic light-harvesting systems." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493387.

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In the first part of this dissertation, we investigate on the presence of quantum effects in the exciton dynamics of the Fenna-Matthews-Olson photosynthetic complex of green sulfur bacteria using an atomistic Quantum Mechanics / Molecular Mechanics (QM/MM) model combined with open quantum systems methods. Subsequently, we explore the theoretical connection between the atomistic QM/MM approach and the open quantum system methods and propose the correct theoretical expressions to maintain consistency when using both approaches contemporarily. In particular we show that when using the correct prefactor to extract the spectral density - the strength of coupling between excitation and other degrees of freedom - the atomistic results are in good agreement with experimental predictions. We then describe a first atomistic study of the full light-harvesting complex of green sulfur bacteria. The various units are treated atomistically and the full system's exciton dynamics is obtained using a Markovian open quantum system master equation. To conclude the first part, we describe a Machine Learning algorithm which we developed and implemented to learn time-dependent density functional theory energies by using trained neural networks and supplying these with coulomb matrices extracted from molecular dynamics simulations. This approach provides a much more rapid solution to obtaining a QM/MM Hamiltonian and subsequently extracting dynamics. It is particularly useful when multiple identical molecules are found in similar environments as one can train the network on a single molecule and predict all others. We applied this method to the Fenna-Matthews-Olson complex. In the second part of this dissertation we focus on model systems and synthetic aggregates. In particular, we investigate the exciton dynamics in thin-film J-aggregates using a Markovian stochastic Schrödinger equation approach. We derive expressions to obtain diffusion constants from the dynamics and compare a series of different thin-film J-aggregates. The parameters of the model are obtained atomistically. From this model we obtain information on the parameters which lead to optimal exciton diffusion. This can guide the design of new exciton transfer materials.
Chemistry and Chemical Biology
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Books on the topic "Light Harvesting Systems"

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Scheer, Hugo, and Siegfried Schneider, eds. Photosynthetic Light-Harvesting Systems. Organization and Function. Berlin, Boston: De Gruyter, 1988. http://dx.doi.org/10.1515/9783110861914.

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1942-, Scheer Hugo, and Schneider Siegfried 1940-, eds. Photosynthetic light-harvesting systems: Organization and function : proceedings of an international workshop, October 12-16, 1987, Freising, Fed. Rep. of Germany. Berlin: W. de Gruyter, 1988.

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Ferreira Carvalho, Carlos Manuel, and Nuno Filipe Silva Veríssimo Paulino. CMOS Indoor Light Energy Harvesting System for Wireless Sensing Applications. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21617-1.

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Photosynthesis III: Photosynthetic membranes and light harvesting systems. Berlin, 1986.

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Scheer, Hugo. Photosynthetic Light-Harvesting Systems: Organizations and Functions : Proceedings. Walter De Gruyter Inc, 1988.

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Arntzen, Charles J., and L. Andrew Staehelin. Photosynthesis III: Photosynthetic Membranes and Light Harvesting Systems. Springer London, Limited, 2013.

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Arntzen, Charles J., and L. Andrew Staehelin. Photosynthesis III: Photosynthetic Membranes and Light Harvesting Systems. Springer London, Limited, 2014.

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Encyclopedia of Plant Physiology: Photosynthetic Membranes and Light Harvesting Systems: Photosynthesis. Springer-Verlag Berlin and Heidelberg GmbH & Co. KG, 1986.

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Staehelin, L. A. Photosynthesis III: Photosynthetic Membranes and Light Harvesting Systems (Encyclopedia of Plant Physiology New Series). Springer, 1986.

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Scheer, Hugo, and Siegfried Schneider. Photosynthetic Light-Harvesting Systems. Organization and Function: Proceedings of an International Workshop October 12-16, 1987. Freising, Fed. Rep. of Germany. de Gruyter GmbH, Walter, 2019.

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Book chapters on the topic "Light Harvesting Systems"

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Della Pelle, Andrea M., and Sankaran Thayumanavan. "Bioinspired Dendritic Light-Harvesting Systems." In Bioinspiration and Biomimicry in Chemistry, 397–417. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118310083.ch13.

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Larkum, Anthony W. D. "Light-Harvesting Systems in Algae." In Photosynthesis in Algae, 277–304. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1038-2_13.

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Ferreira Carvalho, Carlos Manuel, and Nuno Filipe Silva Veríssimo Paulino. "Energy Harvesting Electronic Systems." In CMOS Indoor Light Energy Harvesting System for Wireless Sensing Applications, 7–42. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21617-1_2.

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Macpherson, Alisdair N., and Roger G. Hiller. "Light-Harvesting Systems in Chlorophyll c-Containing Algae." In Light-Harvesting Antennas in Photosynthesis, 323–52. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2087-8_11.

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Falkowski, Paul G., and Yi-Bu Chen. "Photoacclimation of Light Harvesting Systems in Eukaryotic Algae." In Light-Harvesting Antennas in Photosynthesis, 423–47. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2087-8_15.

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Zuber, H., R. J. Cogdell, E. Gantt, Jan M. Anderson, and J. Barrett. "Comparative Biochemistry of Light-Harvesting Systems." In Photosynthesis III, 238–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70936-4_6.

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Mimuro, Mamoru, and Hiroto Kikuchi. "Antenna Systems and Energy Transfer in Cyanophyta and Rhodophyta." In Light-Harvesting Antennas in Photosynthesis, 281–306. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2087-8_9.

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Gantt, Elisabeth, Beatrice Grabowski, and Francis X. Cunningham. "Antenna Systems of Red Algae: Phycobilisomes with Photosystem ll and Chlorophyll Complexes with Photosystem I." In Light-Harvesting Antennas in Photosynthesis, 307–22. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2087-8_10.

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Cogdell, R. J. "Introduction: The Biochemistry Of Light-Harvesting Complexes." In Photosynthetic Light-Harvesting Systems. Organization and Function, edited by Hugo Scheer and Siegfried Schneider, 1–10. Berlin, Boston: De Gruyter, 1988. http://dx.doi.org/10.1515/9783110861914-003.

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Gantt, Elisabeth. "Future Problems On Antenna Systems And Summary Remarks." In Photosynthetic Light-Harvesting Systems. Organization and Function, edited by Hugo Scheer and Siegfried Schneider, 601–4. Berlin, Boston: De Gruyter, 1988. http://dx.doi.org/10.1515/9783110861914-056.

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Conference papers on the topic "Light Harvesting Systems"

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Nielsen, Kim T., Holger Spanggaard, and Frederik C. Krebs. "Design of porphyrin-polyphenyleneethynylene light harvesting systems." In Optics & Photonics 2005, edited by Zakya H. Kafafi and Paul A. Lane. SPIE, 2005. http://dx.doi.org/10.1117/12.613640.

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Choi, Jongouk, Jianping Zeng, Dongyoon Lee, Changwoo Min, and Changhee Jung. "Write-Light Cache for Energy Harvesting Systems." In ISCA '23: 50th Annual International Symposium on Computer Architecture. New York, NY, USA: ACM, 2023. http://dx.doi.org/10.1145/3579371.3589098.

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Moayeri Pour, Golsa, and Walter D. Leon-Salas. "Solar energy harvesting with light emitting diodes." In 2014 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2014. http://dx.doi.org/10.1109/iscas.2014.6865551.

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Patra, Amitava, Dipankar Bain, and Subarna Maity. "Nano-bio assemblies for artificial light harvesting systems." In Colloidal Nanoparticles for Biomedical Applications XIII, edited by Xing-Jie Liang, Wolfgang J. Parak, and Marek Osiński. SPIE, 2018. http://dx.doi.org/10.1117/12.2287324.

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Chachisvilis, M., T. Pullerits, W. Westerhuis, C. N. Hunter, and V. Sundström. "Exciton Coherence in Photosynthetic Light-Harvesting." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.fc.2.

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Excitation transfer in photosynthetic pigments is generally described as incoherent Förster hopping, but the exciton concept has also been applied for photosynthetic antenna systems (1,2). In that case excitation energy is delocalized over a number of pigment molecules and the dynamics occurs through the relaxation between different exciton states. However, often it is not so straightforward to unambiguously distinguish in experiment the two qualitatively different kinetic processes, incoherent hopping and exciton relaxation. The actual dynamics can be a combination of these limiting cases. For example, smaller sections of the full system might behave as a small exciton whereas the dynamics on a larger scale may correspond to the hopping-like transfer of this small exciton. An argument against the pure incoherent Förster mechanism is the recent observation of coherent nuclear motions in the antenna complexes of photosynthetic bacteria (3). The vibrational coherence is preserved for at least the same time as the estimated single step transfer time in these systems. This implies that one of the main assumptions of the Förster theory that the vibronic relaxation occurs much faster than the excitation transfer is not fulfilled. Furthermore, the structural data of several light-harvesting proteins (4,5) show densely packed pigment systems, where exciton interactions are quite strong.
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Whaley, Birgitta. "Single Photon Absorption by Single Photosynthetic Light Harvesting Systems." In Frontiers in Optics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/fio.2017.fm2e.3.

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Aida, Takuzo. "Tailoring assembled systems for light harvesting and energy conversion." In NOBEL SYMPOSIUM 153: NANOSCALE ENERGY CONVERTERS. AIP, 2013. http://dx.doi.org/10.1063/1.4794714.

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Kramer, Tobias, and Christoph Kreisbeck. "Modelling excitonic-energy transfer in light-harvesting complexes." In LATIN-AMERICAN SCHOOL OF PHYSICS MARCOS MOSHINSKY ELAF: Nonlinear Dynamics in Hamiltonian Systems. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4861701.

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Kasemann, Martin, Jan Kokert, Sarai M. Torres, Karola Ruhle, and Leonhard M. Reindl. "Monitoring of indoor light conditions for photovoltaic energy harvesting." In 2014 11th International Multi-Conference on Systems, Signals & Devices (SSD). IEEE, 2014. http://dx.doi.org/10.1109/ssd.2014.6808770.

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Hui Shao, Chi-Ying Tsui, and Wing-Hung Ki. "An inductor-less MPPT design for light energy harvesting systems." In 2009 Asia and South Pacific Design Automation Conference (ASP-DAC). IEEE, 2009. http://dx.doi.org/10.1109/aspdac.2009.4796452.

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Reports on the topic "Light Harvesting Systems"

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Niederman, Robert A., Robert E. Blankenship, and Harry A. Frank. PS2013 Satellite Workshop on Photosynthetic Light-Harvesting Systems. Office of Scientific and Technical Information (OSTI), February 2015. http://dx.doi.org/10.2172/1169442.

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Ely, Roger, Catherine Page, and David Kehoe. Engineered, Solid-State Processes for Enhanced Biosolar Hydrogen Production and Exploitation of Solar Energy with Tailored Light-Harvesting Systems. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada581276.

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Burks, Thomas F., Victor Alchanatis, and Warren Dixon. Enhancement of Sensing Technologies for Selective Tree Fruit Identification and Targeting in Robotic Harvesting Systems. United States Department of Agriculture, October 2009. http://dx.doi.org/10.32747/2009.7591739.bard.

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The proposed project aims to enhance tree fruit identification and targeting for robotic harvesting through the selection of appropriate sensor technology, sensor fusion, and visual servo-control approaches. These technologies will be applicable for apple, orange and grapefruit harvest, although specific sensor wavelengths may vary. The primary challenges are fruit occlusion, light variability, peel color variation with maturity, range to target, and computational requirements of image processing algorithms. There are four major development tasks in original three-year proposed study. First, spectral characteristics in the VIS/NIR (0.4-1.0 micron) will be used in conjunction with thermal data to provide accurate and robust detection of fruit in the tree canopy. Hyper-spectral image pairs will be combined to provide automatic stereo matching for accurate 3D position. Secondly, VIS/NIR/FIR (0.4-15.0 micron) spectral sensor technology will be evaluated for potential in-field on-the-tree grading of surface defect, maturity and size for selective fruit harvest. Thirdly, new adaptive Lyapunov-basedHBVS (homography-based visual servo) methods to compensate for camera uncertainty, distortion effects, and provide range to target from a single camera will be developed, simulated, and implemented on a camera testbed to prove concept. HBVS methods coupled with imagespace navigation will be implemented to provide robust target tracking. And finally, harvesting test will be conducted on the developed technologies using the University of Florida harvesting manipulator test bed. During the course of the project it was determined that the second objective was overly ambitious for the project period and effort was directed toward the other objectives. The results reflect the synergistic efforts of the three principals. The USA team has focused on citrus based approaches while the Israeli counterpart has focused on apples. The USA team has improved visual servo control through the use of a statistical-based range estimate and homography. The results have been promising as long as the target is visible. In addition, the USA team has developed improved fruit detection algorithms that are robust under light variation and can localize fruit centers for partially occluded fruit. Additionally, algorithms have been developed to fuse thermal and visible spectrum image prior to segmentation in order to evaluate the potential improvements in fruit detection. Lastly, the USA team has developed a multispectral detection approach which demonstrated fruit detection levels above 90% of non-occluded fruit. The Israel team has focused on image registration and statistical based fruit detection with post-segmentation fusion. The results of all programs have shown significant progress with increased levels of fruit detection over prior art.
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