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Dissertations / Theses on the topic 'Harvesting method'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

JANA, SOURAV KANTI. "Light harvesting methods in photovoltaic devices with superficial treatments." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28621.

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Photovoltaics is fast emerging as an attractive renewable energy technology due to concerns of global warming, pollution and scarcity of fossil fuels supplies. However to compete in the global energy market, solar cells need to be cheaper and more energy efficient. Silicon is the favourite semiconductor used in solar photovoltaic cells because of its abandoned in nature, well established technology and non toxicity. But due to its indirect band gap, silicon is poor absorber of light and theoretical limiting efficiency of single junction wafer based silicon solar cells is ~31% which is called S

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2

Fofana, Alpha, and Carl Mossberg. "Energy harvesting from ambient WiFi energy : A method of harvesting and measuring ambient WiFi energy." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-257860.

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The aim of this thesis was to investigate the question of how to harvest RF energy and if we can harvest enough RF energy for it to be useful in an application. It is aimed towards sensor node applications, commonly used in a typical office environment. The WiFi band was chosen since it is omnipresent in the same environment. With the current development within wireless technology and the IoT domain the demand for low power electronic applications has increased and one of the challenges is to find efficient and sustainable ways of powering these types of devices.The best possible theoretical p

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Quadros, Carlos Schmidt. "Rainwater harvesting case study: FCT/UNL campus." Master's thesis, Faculdade de Ciências e Tecnologia, 2010. http://hdl.handle.net/10362/4799.

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Dissertação apresentada para a obtenção do grau de Mestre em Engenharia do Ambiente, Perfil Engenharia Sanitária<br>With increasing pressure on the environment, particularly on water resources, due to outside forces such as climate change and population growth, water is nowadays a scarce and a valuable resource. With the need to find new alternatives, rainwater harvesting should be seen as an important strategy for better management of water resources, once it constitutes a free source of potable water. Rainwater harvesting systems, which already have a global implementation, are a recognised

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4

Brandeau, Erich John. "An in-situ interdiffusion method for harvesting energy from an aluminum-water reaction." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74424.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 57-58).<br>Autonomous underwater vehicles (AUVs) are indispensable for countless underwater tasks but are currently limited in their range and endurance by the energy density of their battery packs. Aluminum is an ideal energy source for AUVs because it exothermically reacts with water and is two orders of magnitude more energy dense than current lithium-ion batteries. An in-situ interdiffusion method for reacting alumi

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Grozdanovski, Tatjana, and Tatjana grozdanovski@rmit edu au. "Multi-scaling methods applied to population models." RMIT University. Mathematical and Geospatial Sciences, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091130.102832.

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This dissertation presents several applications of the multi-scaling (multi-timing) technique to the analysis of both single and two species population models where the defining parameters vary slowly with time. Although exact solutions in such cases would be preferred, they are almost always impossible to obtain when slow variation is involved. Numerical solutions can be obtained in these cases, however they are often time consuming and offer limited insight into what is causing the behaviour we see in the solution. Here an approximation method is chosen as it gives an explicit analytic appro

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6

Rafique, Sajid. "Piezoelectric vibration energy harvesting and its application to vibration control." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/piezoelectric-vibration-energy-harvesting-and-its-application-to-vibration-control(d9edcedf-054e-4921-9ba3-5e015b9bbd8f).html.

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Vibration-based energy harvesting using piezoelectric materials have been investigated by several research groups with the aim of harvesting maximum energy and providing power to low-powered wireless electronic systems for their entire operational life. The electromechanical coupling effect introduced by the piezoelectric vibration energy harvesting (PVEH) mechanism presents modelling challenges. For this reason, there has been a continuous effort to develop different modelling techniques to describe the PVEH mechanism and its effects on the dynamics of the system. The overall aims of this the

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7

Triplett, Angela Lynn. "Vibration-Based Energy Harvesting with Essential Non-Linearities." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1322493879.

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8

Kim, Woon Kyung. "Design and Analysis of Switching Circuits for Energy Harvesting in Piezostrutures." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28646.

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This study deals with a general method for the analysis of a semi-active control technique for a fast-shunt switching system. The benefit of the semi-active system is the reduction in power consumption, which is a significant disadvantage of a fully active system compared with a passive system. A semi-active system under consideration is a semi-actively shunted piezoelectric system, which converts the strain energy into electrical energy through strong electromechanical coupling achieved though the piezoelectric phenomenon. Our proposed semi-active approach combines a PZT-based energy harves

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9

Wang, Junjie. "Energy Harvesting Circuit for Indoor Light based on the FOCV Method with an Adaptive Fraction Approach." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/94319.

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The proposed energy harvesting circuit system is designed for indoor solar environment especially for factories where the light energy is abundant and stable. The designed circuits are intended to power wireless sensor nodes (WSNs) or other computing unit such as microcontrollers or DSPs to provide a power solution for Internet of Things (IoTs). The proposed circuit can extract maximum power from the PV panel by utilizing the maximum power point tracking (MPPT) technique. The power stage is a synchronous dual-input dual-output non-inverting buck-boost converter operating in discontinuous condu

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10

Hassan, Mahmoud Wifag. "Water Harvesting for Integrated Water Resources Management and Sustainable Development in Khartoum State." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-125079.

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Khartoum State in Sudan is subject to the erratic and intense rainfall during the short rainy season and dryness and heat throughout the rest of the year. High intensity rainstorms with a short duration have become more frequent in the area during the last two decades resulting in cities inundation and flash floods in the rural parts. On the other hand, the dry season means hot weather in the urban parts and water shortage in the rural part. Rural areas are dependent on the runoff water brought about by the seasonal streams as a source of water. For this study, Khartoum City Center and Seleit

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11

OLIVIERI, STEFANO. "Elastically-bounded flapping plates for flow-induced energy harvesting." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/999997.

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This work concerns a novel concept for energy harvesting (EH) from fluid flows, based on the aeroelastic flutter of elastically-bounded plates immersed in laminar flow. The resulting flapping motions are investigated in order to support the development of centimetric-size EH devices exploiting low wind velocities, with potential application in the autonomous powering of low-power wireless sensor networks used, e.g., for remote environmental monitoring. The problem is studied combining three-dimensional direct numerical simulations exploiting a state-of-the-art immersed boundary method, wind-tu

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12

Zhao, Xiaofei. "Harvesting Microalgae-Development of a Short Residence Time Method Using Rapid-response Temperature-sensitive Semi-IPN Hydrogels." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1434501731.

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13

Masghouni, Nejib. "Hybrid Carbon Fiber/ZnO Nanowires Polymeric Composite for Stuctural and Energy Harvesting Applications." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64354.

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Despite the many attractive features of carbon fiber reinforced polymers (FRPs) composites, they are prone to failure due to delamination. The ability to tailor the fiber/matrix interface FRPs is crucial to the development of composite materials with enhanced structural performance. In this dissertation, ZnO nanowires (NWs) were grown on the surface of carbon fibers utilizing low temperature hydrothermal synthesis technique prior to the hybrid composite fabrication. The scanning electron microscopy revealed that the ZnO nanowires were grown uniformly on the surface of the carbon fabric. The su

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14

Sadeghi, Saviz. "Multi-criteria Spatial Evaluation and Modelling of Farm Dam Site Suitability for Water Harvesting and Conservation." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/16261.

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This study presents a conceptual model designed to identify and rank potential areas for siting farm dams in a section of the Hawkesbury-Nepean catchment in western Sydney, Australia. The method takes into account environmental site assessment criteria using a decision-making method known as the Analytic Hierarchy Process (AHP). Spatial data is processed by applying GIS and potential sites are ranked by a multi-criteria evaluation based on meteorologic, hydrologic, topographic, agronomic and pedologic criteria. Particular to this study is the application of the SCS-CN method using curve number

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15

Turner, Kate. "Assessing wild plant vulnerability to over-harvesting: refinement of the "rapid vulnerability assessment" method and its application in Huitzilac, Mexico." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18450.

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Many concerns have been voiced about the impacts of non-timber forest product harvesting on forest ecosystems, prompting the development of tools for assessing harvest sustainability. The "rapid vulnerability assessment" (RVA) is one method that predicts vulnerability of plants to over-harvesting. However, there is little consensus on how to perform an RVA or interpret the results. The objective of my research is to analyze and refine the RVA method to enhance its utility. I examine factors affecting plant vulnerability used in various versions of the RVA to create a "short list" of important

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16

Perju, Dragos-Stefan. "Applying Memoization as an Approximate Computing Method for Transiently Powered Systems." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-256065.

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Internet of Things (IoT) is becoming a more and more prevailing technology, as it not only makes the routine of our life easier, but it also helps industry and enteprise become more eﬀicient. The high potential of IoT can also help support our own population on Earth, through precision agriculture, smart transportation, smart city and so on. It is therefore important that IoT is made scalable in a sustainable manner, in order to secure our own future as well.The current work is concerning transiently powered systems (TPS), which are embedded systems that use energy harvesting as their only pow

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17

Gisselman, Fredrik. "Economic assessment of harvesting and removing macro algae and reed as an eutrophication mitigation method : A cost-benefit analysis using an ecosystem service approach applied on Burgsviken Gotland." Thesis, Umeå universitet, Nationalekonomi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-99663.

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Odhiambo, Benedict O. "The use of time study, method study and GPS tracking in improving operational harvest planning in terms of system productivity and costs." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5333.

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Thesis (MScFor (Dept. of Forest and Wood Science)--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: This study aims to quantify the benefits of implementing an operational harvesting plan in forest harvesting operations. This is to be achieved by comparing productivity and costs from unplanned and planned harvesting operations. The study was conducted on a Pinus radiata plantation owned by Mountain to Ocean Forestry Company (Pty) Ltd (MTO) located near the town of Grabouw in the Western Cape Province of South Africa. MTO conducts harvesting operations using semi-mechanised tree-len

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19

Yan, Zhimiao. "Modeling of Nonlinear Unsteady Aerodynamics, Dynamics and Fluid Structure Interactions." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/71824.

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We model different nonlinear systems, analyze their nonlinear aspects and discuss their applications. First, we present a semi-analytical, geometrically-exact, unsteady potential flow model is developed for airfoils undergoing large amplitude maneuvers. Towards this objective, the classical unsteady theory of Theodorsen is revisited by relaxing some of the major assumptions such as (1) flat wake, (2) small angle of attack, (3) small disturbances to the mean flow components, and (4) time-invariant free-stream. The kinematics of the wake vortices is simulated numerically while the wake and

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20

Meesala, Vamsi Chandra. "Modeling and Analysis of a Cantilever Beam Tip Mass System." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83378.

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We model the nonlinear dynamics of a cantilever beam with tip mass system subjected to different excitation and exploit the nonlinear behavior to perform sensitivity analysis and propose a parameter identification scheme for nonlinear piezoelectric coefficients. First, the distributed parameter governing equations taking into consideration the nonlinear boundary conditions of a cantilever beam with a tip mass subjected to principal parametric excitation are developed using generalized Hamilton's principle. Using a Galerkin's discretization scheme, the discretized equation for the first mode i

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21

Topal, Emre Tan. "A Mems Thermoelectric Energy Harvester For Energy Generation In Mobile Systems." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613636/index.pdf.

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In this thesis design, optimization, fabrication and performance characterization of MEMS thermoelectric (TE) energy harvesters for harnessing waste heat in mobile systems are presented. As a proof of concept, chromium and nickel are used as the thermoelectric material in the proposed design. The feasibility of the state of the art thermoelectric materials is also discussed. MEMS TE energy harvesters proposed in this study are designed to generate power at relatively lower &Delta<br>T values. The performance of the MEMS TE energy harvesters was optimized using analytical and 3-D finite el

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22

Sijková, Simona. "Návrh testovacího přípravku piezoelektrických vlastností PVDF vrstvy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417737.

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The diploma thesis deals with a design of a tester device, a selection and verification of a suitable method for comparing the piezoelectric properties of tested PVDF samples. In the introduction, a basic overview of the theory is important to understand the issue and the various branches of use of PVDF in the field of energy harvesting. The tester device includes a unimorph piezoelectric cantilever beam with tip mass, whose properties are described by three models: a model with N degrees of freedom reduced to one degree of freedom (NDOF), a single degree of freedom model (SDOF), both created

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Cerney, Dawna Lynn. "Two methods of harvesting native grass community seed." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0015/MQ48244.pdf.

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Blanchard, Jonathan Peter. "Rainwater Harvesting Storage Methods and Self Supply in Uganda." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/3979.

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Self supply is an emerging approach to water supply which focuses on fostering household investment in incremental improvements to their water sources. When successful, it can lower costs and increase sustainability by offering users a larger share of ownership in their own supply, and harnessing the already existing strengths of a community rather than trying to impose an external perspective. In addition to well upgrading and source protection, one of the key self supply areas is rainwater harvesting. Uganda has a diverse selection of rainwater storage options, but many of them are scattered

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Lenhard, Allison N. "Review of energy harvesting methods for twin screw extruders." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127922.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, May, 2020<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 44-48).<br>Energy harvesting is the process of accumulating and storing energy from residual sources for use in powering electronic devices. Low-power energy harvesting technologies typically utilize either mechanical, thermal, radiation, flow-based, or bio-chemical energy sources. Research in low-power energy harvesting technologies is motivated by an increased interest in the Internet of Things and the

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Singh, Raymond Charan. "Modeling Energy Harvesting From Membrane Vibrations using Multi-physics Modeling." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/76793.

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Given the ever-growing need for device autonomy and renewable sources of energy, energy harvesting has become an increasingly popular field of research. This research focuses on energy harvesting using the piezoelectric effect, from vibrating membrane structures by converting mechanical energy into electric energy. Specific applications of this research include powering components of bio-inspired micro air vehicles (MAVs), which require long range with as little regular maintenance as possible, and powering sensors for structural health monitoring on otherwise inaccessible locations (the roof

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Eriksson, Jesper, and Shwana Piroti. "Review of Methods for Energy Harvesting from a Vehicle Suspension System." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-223215.

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With the increasing population the energy consumption has increased which makes the requirement for clean energy important, now more than ever. The transport sector is one of the biggest contributors to this consumption and should therefore be taken into consideration when looking for environmentally friendly solutions. The majority of fuel energy in road-bound vehicles of today is dissipated and is therefore never utilized. For a passenger car traveling at 13.4 m/s it is found that 200 W worth of energy is lost in the vehicles suspension system. The purpose of this work is to analyze and eval

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Thiffault, Évelyne. "Biogeochemistry of forest harvesting methods in the boreal zone of Quebec." Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/24124/24124.pdf.

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Wang, Yafang [Verfasser], and Gerhard [Akademischer Betreuer] Weikum. "Methods and tools for temporal knowledge harvesting / Yafang Wang. Betreuer: Gerhard Weikum." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2013. http://d-nb.info/1052779883/34.

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Griffin, S. Michael. "Islet tissue autotransplantation - harvesting methods and long-term assessment of graft function." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329157.

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31

Reed, Ryan Tyler. "Wireless Information and Power Transfer Methods for IoT Applications." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/104146.

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As Internet of Things (IoT) technology continues to become more commonplace, demand for self-sustainable and low-power networking schemes has increased. Future IoT devices will require a ubiquitous energy source and will need to be capable of low power communication. RF energy can be harvested through ambient or dedicated RF sources to satisfy this energy demand. In addition, these RF signals can be modified to convey information. This thesis surveys a variety of RF energy harvesting methods. A new low complexity energy harvesting system (circuit and antenna) is proposed. Low power communicati

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Deng, Jie. "Vibroacoustic modeling of acoustic blackhole applications in flat, curved andcomplex mechanical structures." Doctoral thesis, Universitat Ramon Llull, 2020. http://hdl.handle.net/10803/670666.

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Els forats negres acústics en mecànica (coneguts per les sigles ABHs, de l’anglès Acoustic Black Holes) solen estar formats per osques en bigues i plaques, el gruix de les quals decau segons una llei potencial. L’efecte de l’ABH és el d’alentir les velocitats de fase i de grup de les ones de flexió incidents de tal manera que, en teoria, faria falta un temps infinit perquè les ones arribessin al centre de l’ABH, si el gruix d’aquest últim fos exactament zero. Tanmateix, a la pràctica això no és possible tot i que es pot aconseguir una forta dissipació col·locant una capa de material esmorteïdo

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Hoang, Thien. "Dispositif de récupération d'énergie piézoélectrique : modélisation, fabrication et caractérisation." Thesis, Tours, 2019. http://www.theses.fr/2019TOUR4023.

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Cette thèse s’inscrit dans le cadre du projet Lab-TMEMS, une collaboration entre le laboratoire GREMAN et l’entreprise VERMON. Le but de ce projet est de réaliser des générateurs piézoélectriques miniaturisés convertissant l’énergie de vibrations basses fréquences, pour alimenter des composants électroniques utilisés notamment dans des applications biomédicales. L’objectif de cette thèse est donc de proposer une stratégie de conception et d’optimisation de tels dispositifs. Afin d’atteindre cet objectif, nous avons développé une démarche originale de modélisation par la méthode des éléments fi

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Boubenia, Sarah. "Générateurs piézoélectriques à base de nanofils piézo-semiconducteurs : modélisation, fabrication et caractérisation." Electronic Thesis or Diss., Tours, 2019. http://www.theses.fr/2019TOUR4038.

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La demande de nouvelles technologies de conversion d'énergie augmente considérablement. Elle a pour but d’offrir une durée de vie augmentée aux microsystèmes et garantir ainsi leur autonomie sans aucune intervention humaine. Dans cette thèse, nous exploitons les nanotechnologies pour le développement d’une nouvelle génération de récupérateurs d’énergie mécanique flexibles et robustes, à partir des matériaux piézoélectriques. Des études expérimentales et des simulations numériques ont été effectuées afin d’améliorer les performances des NanoGénérateurs PiézoElectriques (PENG). Le dispositif pié

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Bell, Robert D. "Influences of varying stand harvest methods on timber harvesting costs in southwestern Virginia hardwoods." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/43079.

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A method was developed for estimating costs of harvesting operations in the hardwood stands of the Appalachian region of southwestern Virginia. The method was then tested on one logging operation to estimate the cost of harvesting a group selection tract as compared to a clearcut. Eight loggers were contacted and interviewed to obtain data on their costs of logging. The mean, median, and standard deviation of the responses were calculated to develop a profile. Mean crew size was three men, including the owner operator. Mechanized equipment consisted of a cable skidder from 75 to 120 hp. an

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Björk, Gabriella. "Evaluation of system design strategies and supervised classification methods for fruit recognition in harvesting robots." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217859.

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This master thesis project is carried out by one student at the Royal Institute of Technology in collaboration with Cybercom Group. The aim was to evaluate and compare system design strategies for fruit recognition in harvesting robots and the performance of supervised machine learning classification methods when applied to this specific task. The thesis covers the basics of these systems; to which parameters, constraints, requirements, and design decisions have been investigated. The framework is used as a foundation for the implementation of both sensing system, and processing and classifica

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Hodges, Amelia Lynn. "Investigation of antennas and energy harvesting methods for use with a UHF microtransceiver in a biosensor network." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/16218.

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Master of Science<br>Department of Electrical and Computer Engineering<br>William B. Kuhn<br>This work was a part of NASA EPSCoR Project NNX11AM05A: Biosensor Networks and Telecommunication Subsystems for Long Duration Missions, EVA Suits, and Robotic Precursor Scout Missions. The project’s main goal is the development of a wireless sensor network inside an astronaut’s spacesuit. Antennas are essential components in a wireless network. Since this antenna will be used inside the spacesuit it is important to consider both the physical size limitations and the desired antenna polarization. Af

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Still, Gwilym T. "Methods for reducing the cost of cementitious building components in developing countries, with particular reference to rainwater harvesting." Thesis, University of Warwick, 2007. http://wrap.warwick.ac.uk/2342/.

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Cementitious building components, although widely used in low-income countries, are too expensive for many applications related to low-income housing. This thesis explores three options for reducing component cost: 1. Use of local fine aggregates, often with clay contamination, instead of low-fines sands transported from a distance. 2. Improved designs, to achieve better material economy. 3. Change of production environment, from on-site to component prefabrication followed by transport to site. Water storage tanks for rainwater harvesting were used as the example for component design, and as

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Rodriguez, Henry. "A Comparison of Rainwater Harvesting Tank Sizing Methods: Optimizing to Reduce Greenhouse Gas Emissions versus Maximizing System Reliability." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo151577155419202.

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Lindemuth, Robert M. "A Field Trial Comparison of Sampling Methods for Estimating Basal Area and Volume in Partially Harvested Stands in Maine." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/LindemuthRM2007.pdf.

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Ramaswamy, Maya. "Assessing occupational health among transitional agricultural workforces: a mixed methods study among U.S. beginning farmers and South Indian tea harvesting workers." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6251.

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Agriculture is a hazardous industry worldwide, and certain groups of agricultural workers are at increased risk of experiencing adverse health outcomes. Agricultural workforces are becoming increasingly transitional, as established and experienced workers exit the industry and new workers take their place. Limited occupational health surveillance exists among certain transitional agricultural workforces. In the US, beginning farmers, i.e., agricultural workers with 10 years or less experience operating a farm, may differ from established farmers in terms of their demographics, length of experi

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Dhayal, Vandana Sultan Singh. "Exploring Simscape™ Modeling for Piezoelectric Sensor Based Energy Harvester." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984261/.

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This work presents an investigation of a piezoelectric sensor based energy harvesting system, which collects energy from the surrounding environment. Increasing costs and scarcity of fossil fuels is a great concern today for supplying power to electronic devices. Furthermore, generating electricity by ordinary methods is a complicated process. Disposal of chemical batteries and cables is polluting the nature every day. Due to these reasons, research on energy harvesting from renewable resources has become mandatory in order to achieve improved methods and strategies of generating and storing e

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Xu, Sheng. "Oxide nanowire arrays for energy sciences." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42876.

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Oxide nanowire arrays are playing an important role in energy sciences nowadays, including energy harvesting, energy storage, and power management. By utilizing a wet chemical growth method, we demonstrated the capabilities of synthesizing density controlled vertical ZnO nanowire arrays on a general substrate, optimizing the aspect ratio of the vertical ZnO nanowire arrays guided by a statistical method, epitaxially growing patterned vertical ZnO nanowire arrays on inorganic substrates, epitaxially growing patterned horizontal ZnO nanowire arrays on non-polar ZnO substrates, and the lift-off o

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Drummond, Hazel. "Distribution and biomass of epiphytic seaweeds on the kelp Ecklonia maxima (Osbeck) Papenfuss, and the potential effects of two kelp-harvesting methods in the Western Cape." Bachelor's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/25563.

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The demand for freshly harvested kelp, Ecklonia maxima, in the Western Cape, has greatly increased due to the need for fodder to supply the growing abalone industry. There is evidence suggesting that the present demand may exceed the amount of E. maxima available, if the traditional method of harvesting continues (cutting the whole kelp plant off, just above the holdfast). There is also evidence that, although the kelp beds recover in 2 - 3 years, and are ready for the next harvesting event, the epiphytic seaweed populations have not recovered even 5 years after harvesting. A new method of har

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Adamou, Djibrilla Incha. "Réseaux de collecte de données pour les zones blanches étendues." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS457/document.

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Les zones blanches étendues sont de vastes espaces géographiques (forêts, déserts), sans ou ayant très peu d’infrastructures telles que les routes, les réseaux électriques ou de télécommunication. Cependant, très souvent, dans ces zones se développent de nombreuses activités économiques ou environnementales telles que le monitoring de l’environnement, la surveillance d’une frontière ou d’une installation de pipeline, ou encore la prévention des feux de forêt. Grâce aux techniques de télédétection et de communication, une fonction clé de ces activités repose sur la collecte d’informations issue

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Brites, Alice Dantas. "Monitoramento dos efeitos ecológicos e socioeconômicos da comercialização de produtos florestais não madereiros." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/90/90131/tde-24032011-215203/.

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A comercialização de produtos florestais não madeireiros (PFNMs) popularizou-se como atividade promotora do desenvolvimento socioeconômico de comunidades florestais com baixo impacto ambiental. Há evidências, contudo, de que a exploração possa produzir efeitos ecológicos e socioeconômicos negativos, sugerindo que é necessário monitorar tais iniciativas. A comercialização frequentemente ocorre em áreas remotas e em contextos de pobreza, como é o caso de muitas daquelas da Amazônia brasileira. Desta forma, é necessário que o monitoramento restrinja-se a avaliar os efeitos evidenciados como mais

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Zhang, Hong-Quan, James P. Brill, and Cem Sarica. "A METHOD OF HARVESTING GAS HYDRATES FROM MARINE SEDIMENTS." 2008. http://hdl.handle.net/2429/1172.

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Gas hydrates bind immense amounts of methane in marine sediments. If produced cost effectively, they can serve as a stable energy supply. No viable technologies for extracting gas hydrates from deep ocean deposits have been developed to date. Due to the shallow depths, low hydrate concentration, low permeability of the gas hydrate stability zone, lack of driving pressure and the slow melting process, low productivity is anticipated for gas production from gas hydrates in marine sediments. Therefore, only a large number of low cost wells can support an offshore production facility and pipeline

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(5931200), Francisco Rivera-Abreu. "Dual Band Octagonal Microstrip Patch Antenna Design Method for Energy Harvesting." 2020.

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A practical method to design dual-band octagonal patch antenna is introduced. The antenna consists of an octagonal patch with a proximity coupling feed designed to radiate at 900 MHz and 1.8 GHz, respectively. The octagonal dual band patch antenna that is designed using the method introduced is then simulated with 3D FEM based electromagnetic simulator. The proposed antenna design can be used to harvest radio frequency (RF) energy from Wi-Fi and widely spread mobile networks. The simulated and analytical results are compared and good agreement is observed.

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Chou, Sheng-Lueng, and 周聖倫. "Piezoelectric Energy Harvesting System to Reduce the Resonant Frequency by Boundary Design Method." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/99q7u6.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>105<br>In this paper, the purpose of this investigation is to design the different boundary conditions to connect the PZT for reducing its natural frequency. The boundary conditions are including both on elastic fixtures and spring boundaries. The several designs used on a series of experimental measurements to verify our predictions. The experimental results are compared with the FEM and theoretical analysis. The Euler-Bernoulli’s beam theory is used to analyze on the vibration characteristics of piezoelectric materials. The natural frequencies of piezoelectric plat

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Chen, Kuan-Ting, and 陳冠廷. "A Study of Electromechanical Behavior of Piezoelectric Energy-Harvesting System Using Finite Element Method." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/29135551772977378470.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>99<br>The research of energy harvesting from environmental resources has received increasing attention due to the decreasing supply of fossil energy. With the advances of MEMS technology and the reduction of power requirement in electronic devices, harvesting energy from vibration sources becomes achievable. This thesis studies the vibration-based piezoelectric energy harvesting based on the finite element simulation. First, the mathematical model is established using the force balance principle and the piezoelectric governing equations. Second, the finite simulatio

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