Filters








130,307 Hits in 7.5 sec

Utility-Lifetime Trade-off in Self-regulating Wireless Sensor Networks: A Cross-Layer Design Approach

Hithesh Nama, Mung Chiang, Narayan Mandayam
2006 2006 IEEE International Conference on Communications  
We compute an optimal set of source rates, network flows, and radio resources at the transport, network, and radio resource layers respectively, while jointly maximizing the network utility and lifetime  ...  , and a network lifetime maximization problem, all of which interact through the dual prices for capacities of links and battery capacities of nodes.  ...  10) for the optimal set of system variables.  ... 
doi:10.1109/icc.2006.255616 dblp:conf/icc/NamaCM06 fatcat:hnvy2ahz5vagxo36cful4vshim

Impact of Urban Density and Building Height on Energy Use in Cities

Eirik Resch, Rolf André Bohne, Trond Kvamsdal, Jardar Lohne
2016 Energy Procedia  
This study provides a theoretical assessment of how energy use is related to urban density in a densely populated area, to aid the development of sustainable cities and land-use planning.  ...  Results indicate that depending on population and building lifetime there exists an optimal building height in the range of 7-27 stories.  ...  For the combination of a low population of 10 thousand (which result in low transportation energy) and a low building lifetime of 40 years (which result in high annual EE), the optimal number of stories  ... 
doi:10.1016/j.egypro.2016.09.142 fatcat:6xqrf4kbhzdpninqwx5xp53n3a

Exergy consumption of cloud computing: A case study

Slavisa Aleksic, Mehdi Safaei
2014 2014 19th European Conference on Networks and Optical Communications - (NOC)  
In this paper, we present a holistic approach that treats ICT as a part of the global ecosystem.  ...  This is mainly because of the complex interdependencies between ICT and different other areas of business and society that together build a very complex ecosystem.  ...  LCA analysis provides a system perspective across the whole life time to define the system boundaries and aid decision making for system optimization and product selection.  ... 
doi:10.1109/noc.2014.6996818 fatcat:3g5udfi6mndi3ebtkscshfxc64

Structure-function relationships of fullerene esters in polymer solar cells: unexpected structural effects on lifetime and efficiency [article]

Michael Tro, Alexis Sarabia, Kyle J. Bandaccari, David Oparko, Emma Lewis, Maxwell J. Giammona, Justin Isaac, Parisa Tajalli-Tehrani Valverde, Grace E. Chesmore, Thorsteinn Adalsteinsson, Richard P. Barber Jr., Brian J. McNelis
2015 arXiv   pre-print
Our results support using a library approach for optimizing device performance in these systems.  ...  We report both transport measurements and spectroscopic data of polymer/fullerene blend photovoltaics using a small library of fullerene esters to correlate device properties with a range of functionality  ...  To date the bulk of research on the polymer blend systems has focused on device fabrication and the synthesis and modification of polymers to improve efficiencies, which have been optimized at 9% or higher  ... 
arXiv:1411.7059v2 fatcat:jlu72xbplnglrgkumxmtojk36m

Page 141 of Journal of Infrastructure Systems Vol. 11, Issue 2 [page]

2005 Journal of Infrastructure Systems  
“Life-cycle relia optimal repair planning for highway bridges: A case study.” Stru reliability in bridge engineering, D. M. Frangopol and G. Hearn, eds McGraw-Hill, New York, 54-59 stes, A.  ...  “System reliability approach to the lifetime optimi zation of inspection and repair of highway bridges.” PhD thesis of Colorado, Boulder, Colo astes, A. C., and Frangopol, D. M. (1996).  ... 

Particle Size Effects on Optimal Sizing and Lifetime of Pipelines Transporting Multi-sized Solid-Liquid Mixtures

László E. Kollár, Rakesh Mishra, Taimoor Asim
2013 Procedia CIRP  
A life-cycle cost analysis model is developed in this study, to examine the effects of particle size distribution of the solid particles to be transported on the optimal sizing and lifetime of the pipelines  ...  The study shows interdependence of parameters such as the lifetime, the optimum diameter, the corresponding spacing for a given pumping power and the particle size distribution of solid particles transported  ...  Conclusions A life-cycle cost analysis model developed in this study is applied to examine the effects of particle size distribution of the solid particles to be transported on optimal sizing and lifetime  ... 
doi:10.1016/j.procir.2013.07.008 fatcat:kp4qiy35fjcobi2t235alyp2ku

Lifetimes of Used Nuclear Fuel Containers Affected by Sulphate-Reducing Bacteria Reactions inside the Canadian Deep Geological Repository

Jorge A. Garcia-Hernandez, Kumaraswamy Ponnambalam, Mythreyi Sivaraman
2021 Applied Sciences  
Previous studies have assumed a conservative constant concentration of sulphide at the host rock interface.  ...  This study shows that the mean lifetimes of UFCs in both cases are above one million years.  ...  Reaction-Diffusion Model Reaction-Diffusion System The system proposed to describe the production of sulphide by the SRB and its dispersion over a one-dimensional space is a set of coupled reaction-diffusion  ... 
doi:10.3390/app11177806 fatcat:ao3hsmzvjvc6bdevhty6rgs6ae

The Role of Charge Balance and Excited State Levels on Device Performance of Exciplex-based Phosphorescent Organic Light Emitting Diodes

Sangyeob Lee, Hyun Koo, Ohyun Kwon, Young Jae Park, Hyeonho Choi, Kwan Lee, Byungmin Ahn, Young Min Park
2017 Scientific Reports  
Here, we report a comprehensive study of exciplex-forming co-host system in OLEDs including the change of co-host materials, mixing composition of exciplex in the device to improve the performance.  ...  As a result, a very high current efficiency of 105.1 cd/A at 10 3 cd/m 2 and an extremely long device lifetime of 739 hrs (t 95 : time after 5% decrease of luminance) are achieved which is one of the best  ...  Y.M.P. gratefully acknowledges the financial support from the Korea Institute of Industrial Technology (KITECH), Republic of Korea, through the internal R&D program (Project No. EO170038).  ... 
doi:10.1038/s41598-017-12059-2 pmid:28931910 pmcid:PMC5607313 fatcat:emrljn5fsrh4jewwn67i4g5zam

Optimal High-Speed Passenger Transport Network with Minimal Integrated Construction and Operation Energy Consumption Based on Superstructure Model

R. Zhang, P. Liu, C. Zhou, A. Amorelli, Z. Li
2016 Chemical Engineering Transactions  
In this paper, we present a mixed-integer programming (MIP) model based on superstructure for the energy consumption optimization of inter-city high-speed transport systems, a network design integration  ...  The energy consumption over the lifetime of transport infrastructure, composed of construction and operation energy consumption, is a significant factor that should be considered at the planning stage.  ...  Two case studies are provided to illustrate how transport modes impact the choice of transport technologies and systems.  ... 
doi:10.3303/cet1652054 doaj:2596a5094f5c42cb872a1bf20c79e5a5 fatcat:sapalylcyjcljdqr6yapgv3r6e

Heat management methodology for enhanced global efficiency in hybrid electric vehicles

F. Claude, H.S. Ramadan, M. Becherif, L. Boulon
2017 Case Studies in Thermal Engineering  
A B S T R A C T The transportation impact on pollution and global climate change, has forced the automotive sector to search for more ecological solutions.  ...  The main objective is to illustrate the interest of using the multi-stack FC system on the global autonomy, cycling, and efficiency enhancement, besides optimizing its operation performance.  ...  Acknowledgement The authors gratefully acknowledge the financial and technical support of Segula Technologies for the use of MTCSim © software during the realization of this scientific research.  ... 
doi:10.1016/j.csite.2017.06.006 fatcat:2vomtljfj5cd7p2brksda3ugbu

Page 774 of American Society of Civil Engineers. Collected Journals Vol. 125, Issue 7 [page]

1999 American Society of Civil Engineers. Collected Journals  
system reliabil- ity of the bridge over time, and revise the optimum bridge repair Strategy CONCLUSIONS \ system reliability approach to optimizing the lifetime repair strategy of highway bridges was  ...  be de- layed if the overall reliability of the system is main- tained The proposed system reliability optimization process produces an optimum lifetime repair strategy for initial planning purposes.  ... 

Structure-function relationships of fullerene esters in polymer solar cells: unexpected structural effects on lifetime and efficiency

Michael Tro, Alexis Sarabia, Kyle J. Bandaccari, David Oparko, Emma Lewis, Maxwell J. Giammona, Justin Isaac, Parisa Tajalli-Tehrani Valverde, Grace E. Chesmore, Thorsteinn Adalsteinsson, Richard P. Barber, Brian J. McNelis
2015 International Journal of Energy Research  
Our results support using a library approach for optimizing device performance in these systems.  ...  Abstract We report both transport measurements and spectroscopic data of polymer/fullerene blend photovoltaics using a small library of fullerene esters to correlate device properties with a range of functionality  ...  A commonly studied organic photovoltaic system utilizes poly(3-hexylthiophene-2,5-diyl) (P3HT) as the photon induced electron donor (Fig. 1) .  ... 
doi:10.1002/er.3463 fatcat:mg7azmxjdjfrlklh67nangtmsa

Hybrid energy storage system integration for vehicles

Jia Wang, Kun Li, Qin Lv, Hai Zhou, Li Shang
2010 Proceedings of the 16th ACM/IEEE international symposium on Low power electronics and design - ISLPED '10  
Energy storage system (ESS) design and optimization is essential for emerging transportation electrification.  ...  Energy consumption and the associated environmental impact are a pressing challenge faced by the transportation sector.  ...  Conclusions This article presents an integrated design and optimization framework for (P)HEV energy storage technology and system integration, a foremost design challenge of emerging transportation electrification  ... 
doi:10.1145/1840845.1840925 dblp:conf/islped/WangLLZS10 fatcat:66e6anobsfgsra5ki7mdcqeczi

Cost Optimized Co2 Pipeline Transportation Grid: A Case Study From Italian Industries

P Bumb, U Desideri, F Quattrocchi, L Arcioni
2009 Zenodo  
In this work, we present the optimized pipeline infrastructure for the CO2 with appropriate constraints to find lower cost system by the use of nonlinear optimization software LINGO 11.0.  ...  This study was conducted on CO2 transportation complex network of Italian Industries, to find minimum cost network for transporting the CO2 from sources to the sinks.  ...  This paper presents a feasibility study of CO 2 capture and storage network via CO 2 pipeline system, with appropriate constraints to find lower cost system by the use of nonlinear optimization software  ... 
doi:10.5281/zenodo.1056356 fatcat:gfirvgvw5bacnnufemsaeww4py

Research on Coordination of Fresh Produce Supply Chain in Big Market Sales Environment

Juning Su, Jiebing Wu, Chenguang Liu
2014 The Scientific World Journal  
The optimal order quantity and the optimal transportation time in these two supply chain systems are derived.  ...  To improve profits in a decentralized supply chain, based on analyzing the risk taken by each participant in the supply chain, we design a set of contracts which can coordinate this type of fresh produce  ...  Thus, this study particularly aims to develop ordering models for such a system to explore optimal coordination contract in the supply chain, considering deterioration and long-distance transportation  ... 
doi:10.1155/2014/873980 pmid:24764770 pmcid:PMC3934086 fatcat:y6maosi3tbd4pexwgtywgyxi4e
« Previous Showing results 1 — 15 out of 130,307 results