Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"critical loads"”.
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Developing Critical Loads and Dynamic Critical Loads for Acidification for Watersheds in the Adirondack region of New York and Great Smoky Mountain National Park (GRSM)
<p>Critical loads (CLs) and dynamic critical loads (DCLs) are important tools for the management of ecosystems that are impacted by high sulfate, nitrate and ammonium deposition. In this study, a biogeochemical model (PnET-BGC) was applied to 20 watersheds in the Adirondack region and 12 watersheds …
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Effects of Acid Deposition and Changing Climate on the Hydrochemistry and Critical Loads of Watersheds in the Adirondack Region of New York
… S and N deposition, and to calculate the target loads of acidity for protecting and restoring stream water quality and ecosystem health. Using measured data, the model was calibrated and applied to simulate soil and stream chemistry at all study sites. Model hindcasts indicate that historically, …
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Multi-Agent Systems in Microgrids: Design and Implementation
… and resiliency of electric power supply to serve critical facilities are of high importance in today's world. Instead of building large electric power grids and high capacity transmission lines, an intelligent microgrid (or smart grid) can be considered as a promising power supply alternative. In …
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Vibrações de placas sandwich enrijecidas por barras conectoras
… midplane, as well as the determination of the critical loads by a dynamical process. The equations of vibration were obtained through the substitution of the constitutive equations into the equations of motion. Some results, as the variation of the natural frequencies and critical loads with …
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Resonant UPS topologies for the emerging hybrid fiber coaxial networks
… systems have been extensively applied to feed critical loads in many areas. Typical examples of critical loads include life-support equipment, computers and telecommunication systems. Although all UPS systems have a common purpose to provide continuous power-to critical loads, the emerging …
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Static and dynamic stability analysis of a truss model
… truss model· is subjected, separately, to static loads, dynamic step loads, and dynamic impulse loads. For each loading, the results are presented in the form of stability boundaries and displacement criteria. For the static loading, the stable equilibrium displacement fields are determined by …
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Lateral-Torsional Buckling Instability Caused by Individuals Walking on Wood Composite I-Joists
… poor resistance to applied lateral and torsional loads and are susceptible to lateral-torsional buckling instability. Workers walking on unbraced or partially braced wood I-joists can induce axial and lateral forces as well as twist. Experimental testing demonstrated that workers cause …
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DEFENSE INSTALLATION ENERGY RESILIENCE FOR CHANGING OPERATIONAL REQUIREMENTS
… scenarios upon energy resilience for mission-critical loads attached to a military base’s microgrid infrastructure. This process applies to any institution with changing operational states whose energy resilience requirements necessitates redundant electrical supply. The methodology may be …
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Análise dinâmica de placas sandwich comprimidas simplesmente apoiadas
… changes in the natural frequencies and stability loads were analyzed according to the variations of the shear stiffness of the plate. The results were plotted and are included in this dissertation. lt was also plotted a curve connecting the vibration modes with the critical loads. Through this …
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Análise estática e dinâmica de vigas sandwich pelo método dos elementos finitos
… analysis of sandwich beams submitted to axial loads as well as for the determination of instability critical loads the Finite Element Method has been used in the present work. The developed elements are also applied to beams where the shear strain has been taken into account. Programs have been …
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Análise modal assintótica da estabilidade de estruturas reticuladas espaciais
… stability for space frames under conservative loads. The general non-linear equilibrium and critical equilibrium equations are obtained through a Lagrangian formulation, by analysing the variation of the total potential energy resulting from incremental displacements. The perturbation technique …
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Modern Adaptive Protection and Control Techniques for Enhancing Distribution Grid Resiliency
… the restoration time and still supply power to critical loads. Such an approach to maintain generator load balance upon islanding detection is studied next by appropriate shedding of non-critical and low priority critical loads based upon voltage sensitivity analysis. Thereafter, adaptive …
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Smart inverters for seamless voltage and frequency dynamics in microgrids
… end, firstly, a new approach of forming smart loads in a fleet of nanogrids, which is also referred as a grid of nanogrids (GNG), is presented in this dissertation. The proposed smart load configuration is obtained via series connection of electric dampers (EDs) with critical loads to cope with …
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Elastic and inelastic responses of columns after sudden loss of bracing
… as a translational spring. Axial compressive loads are applied at the brace and the top of the column, and the equilibrium shape of the column is determined. The critical loads for the perfect column are computed analytically for several load combinations. The dynamic response of the column …
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Resilience and Cybersecurity for Distribution Systems with Distributed Energy Resources
… to enhance resilience by providing energy to critical loads. The DERs comply with IEEE disturbance ride-through requirements and switching transients are maintained within acceptable limits. A comprehensive DER-based resiliency plan is developed and validated for the Virginia Tech smart grid.
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Minimally intrusive strategies for fault detection and energy monitoring
… general, these systems determine the status of critical loads or systems using only electrical data. Thus, remotely located sensors are only employed in order to gather information that would be difficult, if not impossible, to obtain electrically. Examples of such quantities include air …
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Investigation of curved composite panels under high-g loading
… response of the panels. The model predicted the critical buckling loads and mode shapes of the composite panels. Experimentally, controlled axial compression tests and high-g tests were performed to determine the buckling response of the panels. The buckling response, including critical loads and …
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Development of a design methodology for transport aircraft variable camber flaps suitable for cruise and low-speed operations
… aircraft when the effect from aerodynamic loads gave minimum effect on structural deformation. The deflections of the flap as well as spoilers under critical loads were below the allowable limits, which had a minimal effect due to the additional lift force generated from the movable …
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An experimental study of frequency droop control in a low-inertia microgrid
… to provide a reliable source of electricity to critical loads. Efforts in disaster relief operations and national defense applications require a mobile, scalable power grid that is easily constructed and robust enough to handle radical system changes. These microgrids are usually built using …
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