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 38 for “"Operation cost"”.
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Application of Energy Storage in Power Systems
… The model involves methods of reducing the operation cost of a power network and the calculation of capital cost of energy storage systems. Two test systems have been considered, the IEEE six-bus system and the IEEE 118-bus system, to analyze the impact of energy storage on power system …
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Optimization tool for transit bus fleet management
… environmentally-friendly, while maintaining cost-effective operation. Many studies have focused on investigating new bus technologies to reduce emissions and cost. However, they ignored the potential environmental and economic gain by improving the fitness and harmony between individual buses …
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Microgrid-Enabled Reactive Power Support to Enhance Grid Economics
… as an effective means to reduce total system operation cost. In this dissertation, an optimal reactive power model is proposed to determine the optimal nodal reactive powers that result in the lowest total system operation cost. Microgrid is introduced as a source of real and reactive power …
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Cost Optimization Modeling for Airport Capacity Expansion Problems in Metropolitan Areas
<p>The purpose of this research was to develop a cost optimization model to identify an optimal solution to expand airport capacity in metropolitan areas in consideration of demand uncertainties. The study first analyzed four airport capacity expansion cases from different regions of the world to …
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Heavy metal removal from bilge water by electrocoagulation treatment
… water emulsion; and additionally, to discuss the operation cost of the treatment. The optimal configuration for EC treatment used combined electrodes, aluminum and carbon steel; flow rate of 1 L/min; effluent recycling and 7.5 amps; this optimal configuration achieved 99% of zinc removal …
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Critical assessment of techniques, markets and overall economics of Generation III+ and IV reactors
… both a market and product-based approach for the cost of new nuclear installations. It is the contention of this author that the support of the economic benefits for Generation IV reactors is unwarranted. Based on the uncertainties and lack of detailed design engineering completed, there is not …
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Rex 2 : design, construction, and operation of an unmanned underwater vehicle
… vehicles (UUVs) is limited by vehicle and operation cost, difficulty in accurate navigation, and communication between the vehicle and operator. The "Rex 2" UUV employs a system design where a submersible is connected to a float at the water's surface by means of a tether. By maintaining a …
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Optimal Battery Weight Fraction for Serial Hybrid Propulsion System in Aircraft Design
… objectives include aircraft weight, range, operation cost, and carbon emissions. The relationships are based on a serial hybrid electric propulsion architecture from an energy standpoint, and can be applied to hybrid aircraft of different weights, aerodynamic designs, and propulsive …
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Outsourcing transportation infrastructure maintenance : a theoretical approach with application to JR East
… agencies, how to reduce maintenance and operation cost is one of the biggest and most common concerns, because their revenue is not expected to increase drastically in the future. One of the solutions undertaken nowadays is contracting out and utilizing contractors' efficiency for cost …
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Improved packing strategy for distribution centers to reduce freight cost
… outbound packing activities to reduce freight cost and carbon footprint. The strategy consists of two parts. First, I proposed an Carton Combination method, an algorithm that can select any predetermined number of distinct cartons from a large carton pools (over 1000 options) to be used for …
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Reduction of Power and Virtual Machine Migration Inside a Cloud Datacenter
… high amount of electrical energy for its operation. It increases day by day, thus increasing the operation cost and carbon dioxide emission. To reduce the power consumption at a datacenter, a model with an adaptive threshold virtual machine (VM) consolidation method that reduces the number …
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Investigating the effects of maintenance and environmental conditions on the operational efficiency of ships by analysis on the real operational data
… Maritime Organisation (IMO) regarding operational management and design limitations enter force in following years. Besides that, fuel consumption cost represents a major of total ship operation cost. Due to these, environmental performance and energy efficiency are top issues for ship …
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Size Optimization of Utility-Scale Solar PV System Considering Reliability Evaluation
… optimal location by the minimizing total system cost subject to the constraint that the system reliability requirements. Due to the stochastic characteristic of the solar irradiation, the reliability performance of a power system with PV generation is quite different from the one with only …
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Challenges Facing Small Hotel Operators in Tanzania –A Case Study of Arusha Municipality
… challenges that small hotels face in their operations in Arusha Municipality. Specifically, the study aimed at addressing the following objectives: to identify the contribution of small hotels in Arusha Municipality; to examine challenges facing small hotel operators in Arusha Municipality; …
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Multiple-part-type systems in high volume manufacturing : long-term capacity planning & time-based production control
… station, it achieved a 30% reduction in overall operation cost by avoiding extra workload during peak demand period, and its performance can be greatly improved with effective and automatic production scheduling, as well as better utilization of manufacturing resources at the station level. Key …
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Evaluation of the process cost model at Trico Limited Pontypool.
This thesis evaluates the use of the Process Cost Model to identify, categorise and analyse Quality related costs, as defined within the British Standard BS6143 Part 1: 1992. It compares and contrasts this approach against the traditional Prevention-<br/>Appraisal-Failure (P-A-F) model used in most …
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Decentralized model predictive control of urban drainage systems
… linear inequalities to merge different modes of operation into a single expression. The objective function is constituted by 3 cost functions considering several priorities. Except the normal objective of minimizing overflows, we present two methods of reducing operation costs by harvesting rain …
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Effect of rice husk silica reinforcement on recycled aa7075 aluminum chip matrix composite properties
… aluminum resources while reducing the cost of operating. This research was carried out based on the recycling of aluminum alloy AA7075 reinforced silica by rice husk (waste natural fibers) as metal matrix composite. This study approaches the solid state technique to investigate the …
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Development of models for optimal road maintenance fund allocation : A case of Ghana
… based on the Net Present Value/Capital, Vehicle Operation Cost (VOC) and income. The values of the selected attributes were generated from the outputs of HDM-4 analysis. The model based on the preferential analysis was set on the Analytical Hierarchy Process (AHP). It involved pairwise comparison …
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Autonomous wireless smart sensor for monitoring of railroad bridges
… condition assessment, while keeping the operation cost sufficiently low for mandatory annual inspection. This research focuses on developing an autonomous, affordable system for monitoring railroad bridges using wireless smart sensor (WSS), so that a complete end-to-end monitoring …
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