Bibliografie tematiche / Scales of power and management

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Letteratura scientifica selezionata sul tema "Scales of power and management"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Scales of power and management"

Caselli, Michele, Marco Ronchi e Andrea Boni. "Power Management Circuits for Low-Power RF Energy Harvesters". Journal of Low Power Electronics and Applications 10, n. 3 (19 settembre 2020): 29. http://dx.doi.org/10.3390/jlpea10030029.

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The paper describes the design and implementation of power management circuits for RF energy harvesters suitable for integration in wireless sensor nodes. In particular, we report the power management circuits used to provide the voltage supply of an integrated temperature sensor with analog-to-digital converter. A DC-DC boost converter is used to transfer efficiently the energy harvested from a generic radio-frequency rectifier into a charge reservoir, whereas a linear regulator scales the voltage supply to a suitable value for a sensing and conversion circuit. Implemented in a 65 nm CMOS technology, the power management system achieves a measured overall efficiency of 20%, with an available power of 4.5 μW at the DC-DC converter input. The system can sustain a temperature measurement rate of one sample/s with an RF input power of −28 dBm, making it compatible with the power levels available in generic outdoor environments.

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MOLLE, FRANCOIS. "Scales and power in river basin management: the Chao Phraya River in Thailand". Geographical Journal 173, n. 4 (dicembre 2007): 358–73. http://dx.doi.org/10.1111/j.1475-4959.2007.00255.x.

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Henderson, Melinda C. "Measuring Managerial Motivation: The Power Management Inventory". Journal of Nursing Measurement 1, n. 1 (gennaio 1993): 67–80. http://dx.doi.org/10.1891/1061-3749.1.1.67.

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Psychometric properties for Part I ofhe Power Management Inventory (Hawker & Hall, 1981) are presented following validation of the instrument with samples of nurse managers (N=54) and executives (N=92). The content validity indices were .85 for management issues (item stems), .65 for Personalized Power (PP), .75 for Socialized Power (SP), and .70 for Affiliative Motive (AM) scales. Internal consistency reliabilities were acceptable (.63 to .87). Test-Retest correlations (n = 19 managers) ranged from .74 to .85. Correlation of nurse manager (n = 50) scores with subordinate scores of managers were significant (p < .05) for PP (r = .32) and AM (r = .29). Correlation of nurse executive (n = 59) scores with chief executive officer scores of executives were significant for PP (r = .32, p < .01) and AM (r=.25,p< .05). Mean scores on PP, SP and AM failed to profile the motive pattern for “successful” managers. About 29% of the managers and 39% of the executives were categorized as having no power motive preference. Use of the PMI for career counseling/decisions in nursing is not recommended, however, its use as an organizational development tool is endorsed.

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W. Virnstein, Robert. "Seagrass management in Indian River Lagoon, Florida: dealing with issues of scale". Pacific Conservation Biology 5, n. 4 (1999): 299. http://dx.doi.org/10.1071/pc000299.

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The major theme of this paper is that management of seagrass must deal with issues of geographic scale. Approaches at several scales are needed. Examples are drawn primarily from management programmes for the 250 km long Indian River Lagoon system on the south-east coast of Florida. The Lagoon has several attributes of spatial variation that require approaches at various scales (e.g., from 1:1 000 000 to 1:1). Risks and errors of scaling up and scaling down are described. For large-scale approaches, remote-sensing mapping methods are generally appropriate. In the Indian River Lagoon, true-colour aerial photographs. are typically taken every 2?3 years at 1 :24 000 scale. Such Lagoon-wide maps have fuzzy boundaries and cannot be scaled down to fine scale, but they can be scaled up. At large scale, seagrass restoration/protection targets (to a depth of 1.7 m) are reasonable, but are unreasonable at fine scale. For monitoring change within a bed or meadow at metre to 500 m scale, monitoring of fixed transects is a powerful tool. However, the technique has limited power for comparisons among beds, which requires multiple transects. To build a predictive model, a site-specific study examined the relationships among light, water quality, and seagrasses. The link between seagrass and water quality is made through a light attenuation model incorporating both water column and epiphytes. Extensive sampling is required to test the robustness of the model at all scales. No single scale is appropriate for all approaches, and no approach applies over all scales. If such considerations of scale are not incorporated, errors of measurement, inappropriate techniques for assessment, implementation of wrong solutions, and a lack of understanding of the system under study can result.

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Jararweh, Yaser, e Salim Hariri. "Power and Performance Management of GPUs Based Cluster". International Journal of Cloud Applications and Computing 2, n. 4 (ottobre 2012): 16–31. http://dx.doi.org/10.4018/ijcac.2012100102.

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Power consumption in GPUs based cluster became the major obstacle in the adoption of high productivity GPU accelerators in the high performance computing industry. The power consumed by GPU chips represent about 75% of the total GPU based cluster power consumption. This is due to the fact that the GPU cards are often configured at peak performance, and consequently, they will be active all the time. In this paper, the authors present a holistic power and performance management framework that reduces power consumption of the GPU based cluster and maintains the system performance within an acceptable predefined threshold. The framework dynamically scales the GPU cluster to adapt to the variation of incoming workload’s requirements and increase the idleness of the of GPU devices, allowing them to transition to low-power state. The proposed power and performance management framework in GPU cluster demonstrated 46.3% power savings for GPU workload while maintaining the cluster performance. The overhead of the proposed framework is insignificant on the normal application\system operations and services.

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DANDY, NORMAN, STEFANO FIORINI e ALTHEA LYNN DAVIES. "Agenda-setting and power in collaborative natural resource management". Environmental Conservation 41, n. 4 (15 novembre 2013): 311–20. http://dx.doi.org/10.1017/s0376892913000441.

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SUMMARYCollaborative management is a widely accepted means of resolving conflict amongst natural resource stakeholders. Power sharing is central to most conceptualizations of collaboration, but theoretical insights about power are only rarely used to interrogate collaborative processes. Agenda-setting theory was used to analyse cases of collaborative deer management in England, Scotland and Indiana (USA). Collaborative management agendas across scales and social contexts were found to be primarily set by contextual factors, particularly stakeholders drawing on specific cultures and policies, and pre-defining issues. These findings highlight significant gaps between the theory and practice of collaboration. If, in practice, substantial power has been wielded in advance, the capacity of subsequent collaborative processes to share power amongst stakeholders may be severely limited. To provide opportunities for differing cultural perspectives to be expressed and challenged, convenors of collaborative processes therefore need to be aware of and reflexive upon existing power relationships and structures.

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Stillerman, Joel. "Explaining Strike Outcomes in Chile: Associational Power, Structural Power, and Spatial Strategies". Latin American Politics and Society 59, n. 1 (2017): 96–118. http://dx.doi.org/10.1111/laps.12012.

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AbstractResearch on strikes has traditionally focused on how economic, institutional, and political variables shape strike patterns. Recent work examines how workers' structural, associational, and symbolic power facilitate strikes. Building on this research, this article asks, what factors determine strike outcomes? It analyzes four strikes at MADECO, Chile's largest copper manufacturer, across democratic, authoritarian, and postauthoritarian regimes. Using qualitative and documentary evidence, it argues that strike outcomes reflect workers' capacity to halt or disrupt production and to access government allies who can pressure management to settle strikes in workers' favor. Outcomes vary based on the political composition of government, workers' capacity to halt production, and industry's and government's dependence on foreign investment. MADECO workers' location in Santiago, near national officials, allowed them to mobilize at the local, national, and international scales to pressure management. Comparisons with other strikes in Chile, Argentina, and Peru identify similar mobilization patterns.

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Devaney, Laura, e Alastair Iles. "Scales of progress, power and potential in the US bioeconomy". Journal of Cleaner Production 233 (ottobre 2019): 379–89. http://dx.doi.org/10.1016/j.jclepro.2019.05.393.

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van Ackooij, Wim, Debora Daniela Escobar, Martin Glanzer e Georg Ch Pflug. "Distributionally robust optimization with multiple time scales: valuation of a thermal power plant". Computational Management Science 17, n. 3 (20 novembre 2019): 357–85. http://dx.doi.org/10.1007/s10287-019-00358-0.

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AbstractThe valuation of a real option is preferably done with the inclusion of uncertainties in the model, since the value depends on future costs and revenues, which are not perfectly known today. The usual value of the option is defined as the maximal expected (discounted) profit one may achieve under optimal management of the operation. However, also this approach has its limitations, since quite often the models for costs and revenues are subject to model error. Under a prudent valuation, the possible model error should be incorporated into the calculation. In this paper, we consider the valuation of a power plant under ambiguity of probability models for costs and revenues. The valuation is done by stochastic dynamic programming and on top of it, we use a dynamic ambiguity model for obtaining the prudent minimax valuation. For the valuation of the power plant under model ambiguity we introduce a distance based on the Wasserstein distance. Another highlight of this paper is the multiscale approach, since decision stages are defined on a weekly basis, while the random costs and revenues appear on a much finer scale. The idea of bridging stochastic processes is used to link the weekly decision scale with the finer simulation scale. The applicability of the introduced concepts is broad and not limited to the motivating valuation problem.

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Wang, Yanling, Zidan Sun, Zhijie Yan, Likai Liang, Fan Song e Zhiqiang Niu. "Power Transmission Congestion Management Based on Quasi-Dynamic Thermal Rating". Processes 7, n. 5 (26 aprile 2019): 244. http://dx.doi.org/10.3390/pr7050244.

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Transmission congestion not only increases the operation risk, but also reduces the operation efficiency of power systems. Applying a quasi-dynamic thermal rating (QDR) to the transmission congestion alarm system can effectively alleviate transmission congestion. In this paper, according to the heat balance equation under the IEEE standard, a calculation method of QDR is proposed based on the threshold of meteorological parameters under 95% confidence level, which is determined by statistical analysis of seven-year meteorological data in Weihai, China. The QDR of transmission lines is calculated at different time scales. A transmission congestion management model based on QDR is established, and the transmission congestion alarm system including conductor temperature judgment is proposed. The case shows that transmission congestion management based on QDR is feasible, which improves the service life and operation flexibility of the power grid in emergencies and avoids power supply shortages caused by unnecessary trip protection.

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Più fonti

Tesi sul tema "Scales of power and management"

Kong, Na. "Low-power Power Management Circuit Design for Small Scale Energy Harvesting Using Piezoelectric Cantilevers". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77074.

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The batteries used to power wireless sensor nodes have become a major roadblock for the wide deployment. Harvesting energy from mechanical vibrations using piezoelectric cantilevers provides possible means to recharge the batteries or eliminate them. Raw power harvested from ambient sources should be conditioned and regulated to a desired voltage level before its application to electronic devices. The efficiency and self-powered operation of a power conditioning and management circuit is a key design issue. In this research, we investigate the characteristics of piezoelectric cantilevers and requirements of power conditioning and management circuits. A two-stage conditioning circuit with a rectifier and a DC-DC converter is proposed to match the source impedance dynamically. Several low-power design methods are proposed to reduce power consumption of the circuit including: (i) use of a discontinuous conduction mode (DCM) flyback converter, (ii) constant on-time modulation, and (iii) control of the clock frequency of a microcontroller unit (MCU). The DCM flyback converter behaves as a lossless resistor to match the source impedance for maximum power point tracking (MPPT). The constant on-time modulation lowers the clock frequency of the MCU by more than an order of magnitude, which reduces dynamic power dissipation of the MCU. MPPT is executed by the MCU at intermittent time interval to save power. Experimental results indicate that the proposed system harvests up to 8.4 mW of power under 0.5-g base acceleration using four parallel piezoelectric cantilevers and achieves 72 percent power efficiency. Sources of power losses in the system are analyzed. The diode and the controller (specifically the MCU) are the two major sources for the power loss. In order to further improve the power efficiency, the power conditioning circuit is implemented in a monolithic IC using 0.18-μm CMOS process. Synchronous rectifiers instead of diodes are used to reduce the conduction loss. A mixed-signal control circuit is adopted to replace the MCU to realize the MPPT function. Simulation and experimental results verify the DCM operation of the power stage and function of the MPPT circuit. The power consumption of the mixed-signal control circuit is reduced to 16 percent of that of the MCU.
Ph. D.

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Chen, Hongmei. "A Multiscale Forecasting Methodology for Power Plant Fleet Management". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6849.

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In recent years the electric power industry has been challenged by a high level of uncertainty and volatility brought on by deregulation and globalization. A power producer must minimize the life cycle cost while meeting stringent safety and regulatory requirements and fulfilling customer demand for high reliability. Therefore, to achieve true system excellence, a more sophisticated system-level decision-making process with a more accurate forecasting support system to manage diverse and often widely dispersed generation units as a single, easily scaled and deployed fleet system in order to fully utilize the critical assets of a power producer has been created as a response. The process takes into account the time horizon for each of the major decision actions taken in a power plant and develops methods for information sharing between them. These decisions are highly interrelated and no optimal operation can be achieved without sharing information in the overall process. The process includes a forecasting system to provide information for planning for uncertainty. A new forecasting method is proposed, which utilizes a synergy of several modeling techniques properly combined at different time-scales of the forecasting objects. It can not only take advantages of the abundant historical data but also take into account the impact of pertinent driving forces from the external business environment to achieve more accurate forecasting results. Then block bootstrap is utilized to measure the bias in the estimate of the expected life cycle cost which will actually be needed to drive the business for a power plant in the long run. Finally, scenario analysis is used to provide a composite picture of future developments for decision making or strategic planning. The decision-making process is applied to a typical power producer chosen to represent challenging customer demand during high-demand periods. The process enhances system excellence by providing more accurate market information, evaluating the impact of external business environment, and considering cross-scale interactions between decision actions. Along with this process, system operation strategies, maintenance schedules, and capacity expansion plans that guide the operation of the power plant are optimally identified, and the total life cycle costs are estimated.

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Ababneh, Majdi M. "Design of Micro-Scale Energy Harvesting Systems for Low Power Applications Using Enhanced Power Management System". Scholar Commons, 2018. http://scholarcommons.usf.edu/etd/7117.

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The great innovations of the last century have ushered continuous progress in many areas of technology, especially in the form of miniaturization of electronic circuits. This progress shows a trend towards consistent decreases in power requirements due to miniaturization. According to the ITRS and industry leaders, such as Intel, the challenge of managing and providing power efficiency still persist as scaling down of devices continues. A variety of power sources can be used in order to provide power to low power applications. Few of these sources have favorable characteristics and can be designed to deliver maximum power such as the novel mini notched turbine used as a source in this work. The MiNT is a novel device that can be used as a feasible energy source when integrated into a system and evaluated for power delivery as investigated in this work. As part of this system, a maximum power point tracking system provides an applicable solution for capturing enhanced power delivery for an energy harvesting system. However, power efficiency and physical size are adversely affected by the characteristics and environment of many energy harvesting systems and must also be addressed. To address these issues, an analysis of mini notched turbine, a RF rectenna, and an enhanced maximum power point tracking system is presented and verified using simulations and measurements. Furthermore, mini notched energy harvesting system, RF rectenna energy harvesting system, and enhanced maximum power point tracking system are developed and experimental data analyzed. The enhanced maximum power point tracking system uses a resistor emulation technique and particle swarm optimization (PSO) to improve the power efficiency and reduce the physical size. This new innovative design improves the efficiency of optimized power management circuitry up to 7% compared to conventional power management circuits over a wide range of input power and range of emulated resistances, allowing more power to be harvested from small energy harvesting sources and delivering it to the load such as smart sensors. In addition, this is the first IC design to be implemented and tested for the patented mini notched turbine (MiNT) energy harvesting device. Another advantage of the enhanced power management system designed in this work is that the proposed approach can be utilized for extremely small energy sources and because of that the proposed work is valid for low emulated resistances. and systems with low load resistance Overall, through the successful completion of this work, various energy harvesting systems can have the ability to provide enhanced power management as the IC industry continues to progress toward miniaturization of devices and systems.

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Zhang, Ziming. "Adaptive Power Management for Autonomic Resource Configuration in Large-scale Computer Systems". Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804939/.

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In order to run and manage resource-intensive high-performance applications, large-scale computing and storage platforms have been evolving rapidly in various domains in both academia and industry. The energy expenditure consumed to operate and maintain these cloud computing infrastructures is a major factor to influence the overall profit and efficiency for most cloud service providers. Moreover, considering the mitigation of environmental damage from excessive carbon dioxide emission, the amount of power consumed by enterprise-scale data centers should be constrained for protection of the environment.Generally speaking, there exists a trade-off between power consumption and application performance in large-scale computing systems and how to balance these two factors has become an important topic for researchers and engineers in cloud and HPC communities. Therefore, minimizing the power usage while satisfying the Service Level Agreements have become one of the most desirable objectives in cloud computing research and implementation. Since the fundamental feature of the cloud computing platform is hosting workloads with a variety of characteristics in a consolidated and on-demand manner, it is demanding to explore the inherent relationship between power usage and machine configurations. Subsequently, with an understanding of these inherent relationships, researchers are able to develop effective power management policies to optimize productivity by balancing power usage and system performance. In this dissertation, we develop an autonomic power-aware system management framework for large-scale computer systems. We propose a series of techniques including coarse-grain power profiling, VM power modelling, power-aware resource auto-configuration and full-system power usage simulator. These techniques help us to understand the characteristics of power consumption of various system components. Based on these techniques, we are able to test various job scheduling strategies and develop resource management approaches to enhance the systems' power efficiency.

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Mughal, Urooj. "The power politics of water struggles| Local resource management in the West Bank". Thesis, University of Oregon, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1542820.

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This thesis examines the significance of a micro-level approach to the Israeli-Palestinian water conflict. By rethinking scale of analysis and examining local insecurities, Palestinian experiences reveal how water conflict plays out in latent and discursive ways. In a step-by-step method, I detail the processes and outcomes of the water struggle in the West Bank. First, I show how technical challenges ((i) poor water supply, (ii) antiquated water infrastructure, (iii) failed institutions) are shaped by political imperatives. Second, I show how Palestinians have responded to local water sector challenges: (iv) nonpayment to the Palestinian Water Authority for their water supply, (v) increasing rural to urban migration by Palestinian farmers. As a result, Palestinian society is stuck in cycles of crisis that make the conditions increasingly ungovernable. While Palestinians are stuck in a mode of ungovernability, their position in the peace process with Israel is undermined.

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Matos, Elmer Agostinho Carlos de. "A Nova abordagem de gestão de áreas de conservação e suas implicações socioespaciais : o caso de Chimanimani no centro de Moçambique". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/29553.

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A presente pesquisa analisa a produção do território de conservação sob as influências de diversos atores localizados a diferentes escalas de poder e gestão. A partir da abordagem de Territorialização – Desterritorialização – Reterritorialização, analisa-se a passagem de Chimanimani como uma área comunitária, formada por várias comunidades, cuja identidade encontra-se sacralizada nos diversos locais sagrados da área, para um território de conservação, que implicou na (re)estruturação do espaço para atender ao ecoturismo e a conservação. As transformações que ocorreram e que estão ocorrendo em Chimanimani são parte de um processo global, iniciado nos finais da década de 80 com a introdução dos Programas de Reabilitação Econômica. Estas transformações submeteram o local ao global e deslocaram a comanda da área para outras escalas de poder e gestão. As transformações pelas quais Chimanimani foi passando implicaram numa transição da agricultura como a base de sobrevivência para o ecoturismo. A dependência ao ecoturismo como a atividade que melhor compatibiliza a exploração dos recursos naturais numa área de conservação parece não encontrar um enquadramento na dinâmica da atividade turística em Moçambique, que tem como preferência o turismo de “sol e praia”. Como dinamizar o turismo em áreas de conservação é um desafio para a realidade moçambicana, cujas condições dificultam o desenvolvimento do ecoturismo em áreas distantes da região costeira. Dentro desse dilema, propõe-se o Turismo Social como uma possibilidade para o desenvolvimento do turismo nas áreas de conservação.
This research analyses the production of the conservation territory under influences of various actors located at different scales of power and management. From the approaches Territorialization – Desterritorialization – Reterritorialization, we analyze the transition of Chimanimani as a community area, formed by several communities, whose identity is enshrined in the various sacred sites of area, to a conservation area, which resulted in (re)structuring space to answer conservation and ecotourism. Transformations that occurred and are occurring in Chimanimani are part of an overall process, begun in the late 80’s with the introduction o Economic Rehabilitation Programs. These changes submitted the place to the global and moved the command of the area for other scales of power and management. These transformations which Chimanimani are involved implicated a transition of the agriculture as the survival base for the ecotourism. The dependence on ecotourism as the activity that better reconcile the exploration of natural resources in an area of conservation does not seem to find a framework in the dynamics of tourism in Mozambique, which is preferably tourism “Sun and sand”. How to boost tourism in conservation areas is a challenge for the Mozambican reality, whose conditions make it difficult to ecotourism development in remote areas far from the coastal region. In this dilemma, it is proposed Social Tourism as a possibility for the development of tourism in conservation areas.

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Burton, Ludovic Nicolas. "Multi-Scale Thermal Modeling Methodology for High Power-Electronic Cabinets". Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19808.

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Future generation of all-electric ships will be highly dependent on electric power, since every single system aboard such as the drive propulsion, the weapon system, the communication and navigation systems will be electrically powered. Power conversion modules (PCM) will be used to transform and distribute the power as desired in various zone within the ships. As power densities increase at both components and systems-levels, high-fidelity thermal models of those PCMs are indispensable to reach high performance and energy efficient designs. Efficient systems-level thermal management requires modeling and analysis of complex turbulent fluid flow and heat transfer processes across several decades of length scales. In this thesis, a methodology for thermal modeling of complex PCM cabinets used in naval applications is offered. High fidelity computational fluid dynamics and heat transfer (CFD/HT) models are created in order to analyze the heat dissipation from the chip to the multi-cabinet level and optimize turbulent convection cooling inside the cabinet enclosure. Conventional CFD/HT modeling techniques for such complex and multi-scale systems are severely limited as a design or optimization tool. The large size of such models and the complex physics involved result in extremely slow processing time. A multi-scale approach has been developed to predict accurately the overall airflow conditions at the cabinet level as well as the airflow around components which dictates the chip temperature in details. Various models of different length scales are linked together by matching the boundary conditions. The advantage is that it allows high fidelity models at each length scale and more detailed simulations are obtained than what could have been accomplished with a single model methodology. It was found that the power cabinets under the prescribed design parameters, experience operating point airflow rates that are much lower than the design requirements. The flow is unevenly distributed through the various bays. Approximately 90 % of the cold plenum inlet flow rate goes exclusively through Bay 1 and Bay 2. Re-circulation and reverse flow are observed in regions experiencing a lack of flow motion. As a result high temperature of the air flow and consequently high component temperatures are also experienced in the upper bays of the cabinet. A proper orthogonal decomposition (POD) methodology has been performed to develop reduced-order compact models of the PCM cabinets. The reduced-order modeling approach based on POD reduces the numerical models containing 35 x 109 DOF down to less than 20 DOF, while still retaining a great accuracy. The reduced-order models developed yields prediction of the full-field 3-D cabinet within 30 seconds as opposed to the CFD/HT simulations that take more than 3 hours using a high power computer cluster. The reduced-order modeling methodology developed could be a useful tool to quickly and accurately characterize the thermal behavior of any electronics system and provides a good basis for thermal design and optimization purposes.

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Macfie, Peter. "Large-scale security constrained optimal reactive power flow for operational loss management on the GB electricity transmission network". Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/5073.

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The transmission of power across the GB transmission system, as operated by National Grid, results in inevitable loss of electrical power. Operationally these power losses cannot be eliminated, but they can be reduced by adjustment of the system voltage profile. At present the minimisation of active power losses relies upon a lengthy manually based iterative adjustment process. Therefore the system operator requires the development of advanced optimisation tools to cope with the challenges faced over the next decade, such as achieving the stringent greenhouse gas emission targets laid down by the UK government, while continue to provide an economical, secure and efficient service. To meet these challenges the research presented in this thesis has developed optimisation techniques that can assist control centre engineers by automatically setting up voltage studies that are low loss and low cost. The proposed voltage optimisation techniques have been shown to produce solutions that are secured against 800 credible contingency cases. A prototype voltage optimisation tool has been deployed, which required the development of a series of novel approaches to extend the functionality of an existing optimisation program. This research has lead to the development of novel methods for handling multi-objectives, contradictory shunt switching configurations and selecting all credible contingencies. Studies indicate that a theoretical loss saving of 1.9% is achievable, equivalent to an annual emissions saving of approximately 64,000 tonnes of carbon dioxide. A novel security constrained mixed integer non-linear optimisation technique has also been developed. The proposed method has been shown to be superior to several conventional methods on a wide range of IEEE standard network models and also on a range of large-scale GB network models. The proposed method manages to further reduce active power losses and also satisfies all security constraints.

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Rodríguez, Vilamitjana Enric. "Design-oriented model for predicting and controlling fast-scale instabilities in switching converters.application to advanced power management integrated circuits". Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/109043.

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Trends in battery-operated portable applications require further miniaturization and eventually on-chip integration of power processing circuits along with their optimum power management control circuits, considered as key components in on-chip power subsystems which have a high impact upon the overall system in terms of size and efficiency. On-chip power management subsystems, both in regulation and more sophisticated functionalities as wideband tracking, are ideally based on power switching converters, paradigm of high efficiency circuits. These subsystems, due to their nonlinear switched dynamic nature, can exhibit various instabilities which are mainly classified as slow-scale and fast-scale instabilities, the latter also known as subharmonic oscillations. The prediction of slow-scale instabilities can be carried out by conventional averaged dynamic models, which are derived form a simple mathematical circuit analysis and have a clear design-oriented standpoint, but due to their averaged nature, they fail to predict fast-scale instabilities. Alternatively, the prediction of the overall stability boundaries within the complete design space, encompassing fast-scale subharmonic oscillations, has hitherto been addressed from an analytic standpoint based on the discrete-time model, which are based on complex analysis that yields accurate prediction results but lacks of a circuit standpoint and hence are not aligned with a design-oriented use. In this thesis the effect of different system parameters upon the stability boundaries is explored, demonstrating that trends towards integration, namely the reduction of reactive component size or a decrease of the relative switching frequency compared to the converter natural dynamics leads to the exhibition of fast-scale instabilities. As far as characterization is concerned, a two-fold approach has been considered both exploring the complete parameter design space of the switching regulator and categorizing it in terms of which type of nonlinear dynamic performance the circuit exhibits (design space characterization), as well as providing a novel characterization of the electrical behaviour for the different dynamic modes in terms of electrical performance metrics connatural to a power processing circuit, such as voltage ripple, average switching frequency and spectra (electrical characterization). With the aim of having a design-oriented circuit-based model for predicting subharmonic instabilities, the thesis proposes a novel approach based on considering the ripple component at the PWM modulator input as an index to predict the fast-scale stability boundary -in the particular case of a voltage-mode buck converter in continuous conduction mode, a representative case of widespread use in battery-operated applications-. This ripple-based instability index has been validated both from the instantaneous nonlinear dynamic state equations solved numerically as well as through experimental prototypes. Finally a bridge between the ripple-based index approach and the discrete-time model is established though relating the ripple and the control signal slope at the switching instant. The approach has been extended to the discontinuous conduction-mode and to current-mode control, demonstrating the general purpose of the ripple-based fast-scale instability prediction approach. A design-oriented comprehensive frequency domain model able to concurrently predict both slow scale and fast scale instabilities through the combined application of averaged models and the ripple-based approach closes this part. Complementarily to the prediction of fast-scale stability boundary, fast-scale instability controllers or chaos controllers are studied, first revisiting the operating principle of already existing delay-based controllers, afterwards proposing and analyzing simpler implementation-friendly chaos controllers. Under the integrated power management perspective, the thesis extends them taking into account other power processor metrics such as output ripple or transient response, thereby proposing a novel controller that, apart from improving fast-scale stability boundary, allows reducing reactive components size and the output voltage ripple. Finally, the thesis tackles the fast-scale instabilities in more advanced topologies and functionalities, which are representative of advanced power management circuits. First, for a multilevel converter, demonstrating that its inherent lower ripple behaviour makes it less prone to exhibit fast-scale instabilities and hence a better candidate to integration, and second for a wideband switching power amplifier, exploring its nonlinear dynamic phenomena and demonstrating that in the case of a single-tone modulation with a frequency close to the filter and switching frequencies, the fast scale stability boundary condition for regulation application is a sufficient condition to guarantee stability over the entire reference period for tracking applications.
Les tendències actuals i previsiblement futures en aplicacions portàtils alimentades per bateries requereixen de major miniaturització i finalment de la integració en un sol chip del circuit de processament de potència juntament amb els circuits de control i gestió optima de la energia, considerats com components clau en els subsistemes de potència, els quals tenen un important impacte global en la mida i la eficiència energètica de tot el sistema. El subsistemes de gestió de potència, tant en regulació com en funcionalitats més sofisticades com és el seguiment de senyals de gran ample de banda amb alt rendiment, són idealment basats en convertidors commutats de potència, paradigma de circuits processadors d’energia d’alt rendiment. Aquests subsistemes, degut a la seva natura no lineal, poden exhibir diverses inestabilitats, les quals es poden classificar segons l’escala temporal en escala ràpida o escala lenta. La predicció de les inestabilitats d’escala lenta es duu a terme habitualment mitjançant els models promitjats convencionals, els quals es deriven d’un anàlisi simple del circuit i tenen com a clar objectiu la simplificació del disseny del sistema, però degut a la seva natura promitjada, no permeten predir les inestabilitats d’escala ràpida. Alternativament, la predicció de la frontera complerta d’estabilitat, incloent ambdós tipus d’inestabilitats, s’ha abordat en el passat des d’un punt de vista analític mitjançant els models en temps discret, basats en una desenvolupament matemàtic més complex i acurat, però que resulta en un anàlisis que s’allunya de la perspectiva orientada al disseny del sistema. En aquest tesis, l’efecte dels diferents paràmetres de l’espai de disseny del sistema sobre la frontera d'estabilitat ha estat explorat, demostrant que les tendències cap a la integració, es a dir, la reducció dels components reactius o la reducció de la freqüència de commutació, condueix a una propensió a exhibir inestabilitats dinàmiques d’escala ràpida. Pel que fa a la caracterització d’aquestes inestabilitats, s’ha dut a terme explorant completament l’espai de disseny així com proposant una caracterització en termes de mètriques de circuit processador d’energia elèctrica del diferents modes dinàmics, incloent així el seu impacte en termes d'arrisat de tensió, espectre, i freqüència promig de commutació. Amb l’objectiu de derivar un model orientat al disseny per predir les inestabilitats d’escala ràpida, la tesi proposa un índex basat en la mesura de l’arrisat a la entrada del modulador PWM per predir de forma quantitativa aquestes inestabilitats en mode de control de tensió. Aquest índex ha estat validat mitjançant simulacions numèriques i experimentalment. Addicionalment, la tesi demostra la relació existent entre l’arrisat en el modulador i els mapes en temps discret. La proposta s’ha estès per al mode de conducció discontinua i també pel mode de control per corrent, demostrant així l’aplicabilitat general de la proposta. Finalment, s’ha proposat i estudiat un model complet en el domini de la freqüència, capaç de predir concurrentment els dos tipus de inestabilitats mitjançant l’aplicació conjunta del model promitjat i el model basat en l’arrisat. De forma complementaria a la predicció de les inestabilitats d’escala ràpida, s’han estudiat diversos controladors orientats a modificar el comportament inestable. Primer tot revisant el principi de funcionament del controladors existents, basat majoritàriament en línies de retard i posteriorment proposant i analitzant controladors que tinguin una implementació mes factible en el domini analògic. Sota la perspectiva de la integració en silici dels sistemes de potència, la tesi ha estès l’anàlisi dels controladors tenint en compte altres mètriques com ara l’arrisat de sortida o la resposta transitòria a un canvi de la carga. Així, s’ha proposat un nou controlador, el qual apart de millorar les inestabilitats d’escala ràpida, permet reduir la mida del components reactius i alhora l’arrisat de sortida del convertidor. Finalment, la tesi aborda la caracterització i predicció de les inestabilitats d’escala ràpida en topologies i funcionalitats mes avançades. Primer, per a un convertidor multinivell, demostrant que el seu inherent baix arrissat el fa menys proper a exhibir inestabilitats i per tant un millor candidat a la integració, i seguidament per a un amplificador commutat de gran ample de banda, explorant la seva dinàmica no lineal, i demostrant que en el cas d’un sol to sinusoïdal, la condició d’estabilitat per regulació estableix una condició suficient per garantir l’estabilitat per aplicacions de seguiment.

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Lee, Sang Hoon. "Management of building energy consumption and energy supply network on campus scale". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43580.

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Building portfolio management on campus and metropolitan scale involves decisions about energy retrofits, energy resource pooling, and investments in shared energy systems, such as district cooling, community PV and wind power, CHP systems, geothermal systems etc. There are currently no tools that help a portfolio/campus manager make these decisions by rapid comparison of variants. The research has developed an energy supply network management tool at the campus scale. The underlying network energy performance (NEP) model uses (1) an existing energy performance toolkit to quantify the energy performance of building energy consumers on hourly basis, and (2) added modules to calculate hourly average energy generation from a wide variety of energy supply systems. The NEP model supports macro decisions at the generation side (decisions about adding or retrofitting campus wide systems) and consumption side (planning of new building design and retrofit measures). It allows testing different supply topologies by inspecting which consumer nodes should connect to which local suppliers and to which global suppliers, i.e. the electricity and gas utility grids. A prototype software implementation allows a portfolio or campus manager to define the demand and supply nodes on campus scale and manipulate the connections between them through a graphical interface. The NEP model maintains the network topology which is represented by a directed graph with the supply and demand nodes as vertices and their connections as arcs. Every change in the graph automatically triggers an update of the energy generation and consumption pattern, the results of which are shown on campus wide energy performance dashboards. The dissertation shows how the NEP model supports decision making with respect to large-scale building energy system design with a case study of the Georgia Tech campus evaluating the following three assertions: 1. The normative calculations at the individual building scale are accurate enough to support the network energy performance analysis 2. The NEP model supports the study of the tradeoffs between local building retrofits and campus wide energy interventions in renewable systems, under different circumstances 3. The NEP approach is a viable basis for routine campus asset management policies.

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Libri sul tema "Scales of power and management"

Berndt, Enno. J-Economy, J-Corporation and J-Power since 1990. Venice: Edizioni Ca' Foscari, 2018. http://dx.doi.org/10.30687/978-88-6969-276-5.

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Once hailed as superpower and benchmark of Post-Fordism management, Japan’s economy and its corporations are taken as negative example of insufficient compliance to neoliberalist policies. This book demonstrates that the problems of Japan’s economy and corporations are more universal: encountering the limits of mass-industrialised production and -consumption, large corporations fail to ignite innovation by decentralisaation and bottom-up participation. Instead, they increase their returns by ongoing cost reduction and centralization, adhere to large-scale technology, fuel profits into M&A to defend their traditional business models and privilege capital providers and top executives.

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Schäffer, Utz. Management accounting & control scales handbook. Wiesbaden: Dt. Univ.-Verl., 2007.

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Zhang, Xi, e Chris Mi. Vehicle Power Management. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-736-5.

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Benini, Luca, e Giovanni De Micheli. Dynamic Power Management. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5455-4.

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W, Running S., a cura di. Forest ecosystems analysis at multiple scales. 3^a ed. Burlington, MA: Elsevier Academic, 2007.

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Sah, A. K. Power management in India. New Delhi: Standing Conference of Public Enterprises, 1986.

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Bunnell, James C. Power management that works! San Diego, CA: Annabooks, 1994.

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Introna, Lucas D. Management, Information and Power. London: Macmillan Education UK, 1997. http://dx.doi.org/10.1007/978-1-349-14549-2.

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Bagilhole, Barbara, e Kate White, a cura di. Gender, Power and Management. London: Palgrave Macmillan UK, 2011. http://dx.doi.org/10.1057/9780230305953.

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Dace, Andrea. Power management: IC components. Norwalk, CT: Business Communications Co., 1999.

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Capitoli di libri sul tema "Scales of power and management"

Soroudi, Alireza, Behnam Mohammadi-Ivatloo e Abbas Rabiee. "Energy Hub Management with Intermittent Wind Power". In Large Scale Renewable Power Generation, 413–38. Singapore: Springer Singapore, 2014. http://dx.doi.org/10.1007/978-981-4585-30-9_16.

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Cao, Qiang, e Changsheng Xie. "Power Conservation in Large-Scale Storage Systems". In Web-Age Information Management, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39527-7_1.

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Kondo, Masaaki, Ikuo Miyoshi, Koji Inoue e Shinobu Miwa. "Power Management Framework for Post-petascale Supercomputers". In Advanced Software Technologies for Post-Peta Scale Computing, 249–69. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1924-2_13.

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Gröwe-Kuska, Nicole, Matthias P. Nowak e Isabel Wegner. "Modeling of Uncertainty for the Real-Time Management of Power Systems". In Online Optimization of Large Scale Systems, 623–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04331-8_31.

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Mukhia, Akash Deep, Anwesh Gautam, Suyog Pradhan e Sandip Kumar Gupta. "Design and Fabrication of Scale-Down Model of 620 MVA, 275 kV Transmission Line". In Advances in Power Systems and Energy Management, 729–35. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4394-9_72.

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Unzalu, E. A. "Atmospheric Environmental Management Expert System for an Oil-Fired Power Plant". In Large Scale Computations in Air Pollution Modelling, 349–58. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4570-1_31.

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Berl, Andreas, Gergö Lovász, Ferdinand von Tüllenburg e Hermann de Meer. "Modelling Power Adaption Flexibility of Data Centres for Demand-Response Management". In Energy Efficiency in Large Scale Distributed Systems, 63–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40517-4_6.

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Sauhats, Antans, Vladimir Chuvychin, Galina Bockarjova, Diana Zalostiba, Dmitrijs Antonovs e Roman Petrichenko. "Detection and Management of Large Scale Disturbances in Power System". In Critical Information Infrastructures Security, 147–52. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31664-2_15.

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Gazdag, David, e Guy Parker. "Wild Power, Biodiversity and Solar Farms: A Business Model to Encourage Climate Change Mitigation and Adaptation at Scale". In Climate Change Management, 391–402. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-98681-4_24.

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Carrière, Michelle E., Annekatrien L. van de Kar e Paul P. M. van Zuijlen. "Scar Assessment Scales". In Textbook on Scar Management, 125–32. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44766-3_14.

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AbstractOver the last decades, many scar assessment scales have been developed, not only to evaluate the effectiveness of new and existing treatments in the research setting but also to monitor scars in individual patients. Clinician-reported scar scales allow for the evaluation of observable aspects of the scar, while patient-reported scar scales enable the evaluation of additional health domains that cannot be observed by clinicians, such as scar symptoms or sensations and quality of life. The quality of scar assessment scales is determined by several measurement properties (i.e., validity, reliability, and responsiveness). This chapter provides an overview of the content and development of the most frequently used scar assessment scales.

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Atti di convegni sul tema "Scales of power and management"

Xing, Xiaowen, Hongmin Meng, Lili Xie, Peng Li, Sergio Toledo, Yuzhi Zhang e Josep M. Guerrero. "Multi-time-scales energy management for grid-on multi-layer microgrids cluster". In 2017 IEEE Southern Power Electronics Conference (SPEC). IEEE, 2017. http://dx.doi.org/10.1109/spec.2017.8333656.

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Macko, Dominik, Katarina Jelemenska e Pavel Cicak. "Power-management high-level synthesis". In 2015 IFIP/IEEE International Conference on Very Large Scale Integration (VLSI-SoC). IEEE, 2015. http://dx.doi.org/10.1109/vlsi-soc.2015.7314393.

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Liu, Guangyu, Haoxiang Qiu, Ling Zhu e Yun Chen. "Architecture and experiment of remote monitoring and operation management for multiple scales of solar power plants". In 2017 IEEE 2nd Advanced Information Technology, Electronic and Automation Control Conference (IAEAC). IEEE, 2017. http://dx.doi.org/10.1109/iaeac.2017.8054471.

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Meyer, Christopher D., Sarah S. Bedair, Brian C. Morgan, Xue Lin, Rizwan Bashirullah, David P. Arnold, Iain M. Kierzewski e Nathan S. Lazarus. "Power management for small scale systems". In SPIE Defense + Security, a cura di Thomas George, M. Saif Islam e Achyut K. Dutta. SPIE, 2014. http://dx.doi.org/10.1117/12.2050626.

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Arnulfi, Gianmario L., e Martino Marini. "Management Strategies for a Compressed Air Energy Storage Plant". In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90437.

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Energy storage can balance supply and demand over different time scales, with technical and economical benefits. In the present paper, commercial gas turbines, just modified for storage purposes, are considered. The possibility to improve their profitability in an utility perspective is investigated. The adopted strategy is based on a fair mix of different working states (charging, discharging, stand by or mere Brayton cycle operation), according to the instant energy market price, the previous history (storage level) and the plant features (reservoir and GT size). A simple mathematical model of the plant was conceived and a dynamic self-adjusting abacus was developed in order to select a suitable sequence of working ways. The expected results consist in the improvement of the daily cash flow and in the peak power augmentation. Both of them are due to the chance of exploiting a turbo expander not loaded with the compressor driving during the hours when energy price is the highest.

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De Tran. "Managing Large Scale Network Model for Energy Management Systems & Business Management Systems". In 2007 IEEE Power Engineering Society General Meeting. IEEE, 2007. http://dx.doi.org/10.1109/pes.2007.385959.

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Korolev, Anton S., e Alena A. Kubarskaya. "Instruments of Configuration Management in Nuclear Power Plant Projects". In 2019 Twelfth International Conference "Management of large-scale system development" (MLSD). IEEE, 2019. http://dx.doi.org/10.1109/mlsd.2019.8911099.

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Passos, Rodrigo, Jose Nacif, Raquel F. Mini, Antonio F. Loureiro, Antonio Fernandes e Claudionor Coelho. "System-level Dynamic Power Management Techniques for Communication Intensive Devices". In 2006 IFIP International Conference on Very Large Scale Integration. IEEE, 2006. http://dx.doi.org/10.1109/vlsisoc.2006.313264.

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Maximov, Yury, e Dmitry Maximov. "Monitoring Power Quality in Conflict Situations". In 2019 Twelfth International Conference "Management of large-scale system development" (MLSD). IEEE, 2019. http://dx.doi.org/10.1109/mlsd.2019.8911047.

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Siozios, Kostas, Dimitrios Soudris e Antonios Thanailakis. "Efficient Power Management Strategy of FPGAs Using a Novel Placement Technique". In 2006 IFIP International Conference on Very Large Scale Integration. IEEE, 2006. http://dx.doi.org/10.1109/vlsisoc.2006.313234.

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Rapporti di organizzazioni sul tema "Scales of power and management"

Coughlin, Katie, e J. H. Eto. Analysis of Wind Power and Load Data at Multiple Time Scales. Office of Scientific and Technical Information (OSTI), dicembre 2010. http://dx.doi.org/10.2172/1004166.

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Sanders, David. Land Warrior Power Management. Fort Belvoir, VA: Defense Technical Information Center, giugno 2003. http://dx.doi.org/10.21236/ada414902.

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Ilin, Cornelia, Sébastien Annan-Phan, Xiao Hui Tai, Shikhar Mehra, Solomon Hsiang e Joshua Blumenstock. Public Mobility Data Enables COVID-19 Forecasting and Management at Local and Global Scales. Cambridge, MA: National Bureau of Economic Research, novembre 2020. http://dx.doi.org/10.3386/w28120.

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Tom Addison e Andrew Stanbury. Power Contro Energy Management and Market Systems. Office of Scientific and Technical Information (OSTI), dicembre 2005. http://dx.doi.org/10.2172/877380.

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Toman, G., e R. Gazdzinski. Aging Management Guideline for commercial nuclear power plants: Power and distribution transformers. Office of Scientific and Technical Information (OSTI), maggio 1994. http://dx.doi.org/10.2172/10154007.

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Falsafi, Babak, e Raj Rajkumar. Powertap: System-Wide Power Management Through Power-Aware System Software And Hardware. Fort Belvoir, VA: Defense Technical Information Center, agosto 2005. http://dx.doi.org/10.21236/ada446222.

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Gray, Genetha Anne, Jean-Paul Watson, Cesar Augusto Silva Monroy e Robert B. Gramacy. Quantifiably secure power grid operation, management, and evolution :. Office of Scientific and Technical Information (OSTI), settembre 2013. http://dx.doi.org/10.2172/1096519.

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Moreno, Gilberto. Power Electronics Thermal Management Research: Annual Progress Report. Office of Scientific and Technical Information (OSTI), ottobre 2017. http://dx.doi.org/10.2172/1404874.

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Orsagh, Rolf, Douglas Brown, Michael Roemer, Thomas Dabney e Andrew Hess. Prognostic Health Management for Avionics System Power Supplies. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2005. http://dx.doi.org/10.21236/ada448885.

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Miljkovic, Nenad, Thomas Foulkes, Junho Oh, Patrick Birbarah, Robert Pilawa-Podgurski e Jason C. Neely. Advanced Thermal Management for High Power Density Electronics. Office of Scientific and Technical Information (OSTI), ottobre 2017. http://dx.doi.org/10.2172/1510616.

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