292 research outputs found
Options for emissions reduction from power plants: An economic evaluation
No full textThe electric power sector is regarded globally as the major contributor to local air quality degradation and to global environmental impacts such as acid rain and greenhouse phenomenon. Several mitigation technologies are available to reduce the different emissions, mainly sulfur dioxide, from power plants. The most pronounced ones are switching to low-sulfur fuel oil, filtering stack emissions using flue gas desulfurization systems, and shifting to natural gas as an alternative fuel for thermal power plants. The objective of this paper is to present an economic model that can be used for evaluating and comparing the three alternatives under consideration, so as to determine the most economically feasible option taking into account various cost parameters. This evaluation will incorporate assessment on the environmental damages caused by these emissions and an economic model representing uncertainties in different parameters involved. A case study was conducted on an existing power plant including a sensitivity analysis to examine the impact of different parameters with high levels of uncertainty. © 2004 Elsevier Ltd. All rights reserved.ABBOUD N, 2000, INT J ENVIRON STUD, V57, P225, DOI 10.1080-00207230008711268; Burtraw D, 1997, COSTS BENEFITS REDUC; CHAABAN FB, 2002, WORLD RESOUR REV, V14, P88; Chedid R, 1999, INT J ENERG RES, V23, P303, DOI 10.1002-(SICI)1099-114X(19990325)23:4303::AID-ER4793.0.CO;2-1; Chedid R, 2001, ENERG CONVERS MANAGE, V42, P373, DOI 10.1016-S0196-8904(00)00060-1; Ghaddar N, 1999, APPL ENERG, V63, P53, DOI 10.1016-S0306-2619(99)00018-5; HAFNER M, 1993, TRANSPORT GAZ NATURA; *INT EN AG, 1994, NAT GAS TRANSP PRG R; Jepma Catrinus J., 1998, CLIMATE CHANGE POLIC; LOTT R, NATURAL GAS STRATEGY; Mezher T, 1998, APPL ENERG, V61, P175, DOI 10.1016-S0306-2619(98)00043-9; Park C.S., 1997, CONT ENG EC; TAUD R, 2001, GAB TURBINE POWER PL; *TECHN, 2001, ALT FUL POW NAT GAS; 2001, INT ENERGY OUTLOOK 228191
Transitioning to the green economy: The Arab transport sector policy brief
No full textThis paper highlights the existing policies, current practices, and major trends for the transport sector in Arab countries, and then discusses their current implications on development, social integration, and the environment and the need to adopt non-conventional approaches and measures to provide transport systems that promote sustainable development. The paper explores the potential of developing policies, incentive measures, and green strategies to promote innovative practices for the movement of people and goods, including public transport and, as a result, eliminate the negative impacts from the inappropriate practices nationwide. The paper also addresses establishing a green transport infrastructure network at the regional scale. © 2013 WIT Press
Sustainability of engineering education in the Gulf Cooperation Council region
No full textAt the turn of the 21st century, many universities have been established in the Gulf Cooperation Council (GCC) region, many of which are branches of universities from the USA, Europe, Australia, and other regions. In 2004, Dhofar University (DU), in collaboration and partnership with the American University of Beirut (AUB), opened its doors in Oman to follow the American model of higher education in many programs including engineering. Making use of AUB's well known engineering programs in the Middle East, founders of DU have planned to satisfy the demand for a sustainable institution that can serve students as well as society as a whole. This paper presents DU's experience in developing sustainable education institution in a region that lacked for long time private universities. The paper presents the model of collaboration between DU and AUB, and DU's efforts in preparing for accreditation. The paper also presents DU practices in balancing core academics and non-technical skills of engineering students. The cases studied are mainly from the academic programs of the Electrical and Computer Engineering (ECE) Department at the College of Engineering. © 2011 IEEE
A Simplified Electric Circuit Model for the Analysis of Hybrid Wind-Fuel Cell Systems
No full textThis paper proposes a simulation methodology for a Wind Energy Conversion System (WECS) incorporating fuel cells as a backup generator. A complete mathematical model for each component of the wind-fuel cell hybrid system is presented, and a simplified electric circuit is developed. The complete electric circuit is composed of two parts; the first part models a wind turbine driving a three-phase permanent magnet alternator connected to a rectifier and an electrolyzer, and the second part models the fuel cell and the load. Simulations are then carried out using SIMULINK to determine the current flowing though the electrolyzer, the amount of hydrogen produced by the electrolyzer, the amount of hydrogen consumed by the fuel cell and the current drawn by the load. Although the paper focuses only on the steady state analysis of the system, the model can also be used to conduct dynamic studies. © 2007 IEEE
Entrance to the Physical Education Building at the University of Southern California, [s.d.]
No full textPhotograph of the entrance to the Physical Education Building at the University of Southern California, [s.d.]. The entrance is at center at the base of a large archway. Three sets of doors can be seen, separated by cylindrical columns. At the peak of the arch, a stone statue depicting the head of a Trojan sticks out from the building. The seal of the University appears directly over the statue. The walls of the building are made of large, light-colored bricks at center and more conventional bricks on the outside. Engraved on the side of the building at right are the words "In Concordiam Mentis Et Corporis".; "A Trojan warrior keeps silent vigil above the entrance to the physical education building at the University of Southern California. One of the more recent additions to the university, latest equipment of every kind is at the disposal of S.C. students for the development of sound bodies. Large gymnasiums, two swimming pools, handball courts, spacious locker rooms, and other conveniences are features of the building, which also contains a group of lecture rooms and faculty offices."-- unknown author. Photoprint reads: "News Bureau, F.B. Skeele, University of Southern California, University Park, Los Angeles, California"
Review of the book by F.B. Batyrgarey “Registers of birth of muslims in the city of Tver”
No full textThe article is a review of the new book by researcher F.B. Butyrgarey Registers of Birth of Muslims in the City of Tver. The book devoted to the publication of Muslim metric books of Tver is of importance and much-in-demand. These documents are published for the first time. The research includes all Muslim parish registers of the city of Tver, which were kept in the State Archive of the Tver Region. The author provided their transcription and on the basis of the given documents, he presented an interesting material about the state and development of the Tatar society of the Russian city of Tver in 1905–1918
Data-Driven Approach for Systemic Risk: A Macroprudential Perspective
No full textThis paper proposes a sovereign CDS analysis for systemic risk, assuming a macroprudential perspective and building on the modelling framework proposed by Baglioni and Cherubini (J. Econ. Dynam. Control 37:1581–1597, 2013). A data-driven approach applied to CDS quotes is considered to estimate a reduced form model for the marginal intensity of defaults at country level and investigate the presence of common factors. Results show a systematic effect on default intensities, rank correlation and common factors for countries in the sample with specific geographic differences. This is an important empirical evidence to further investigate how to model, measure and assess the drivers explaining heterogeneity in impacts across countries and build early warning indicators to support strategic decision making.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Applied Probabilit
A study of social and economic implications of mobile sources on air quality in Lebanon
No full textThe work presented in this paper is aimed at investigating the economic effects of air pollution from mobile sources on public health in Lebanon. It is part of the effort to implement MedPolicies Initiative of the Mediterranean Environmental Technical Assistance Program (METAP III whose objective is to encourage sustainable economic growth through the integration of environmental concerns in economic and fiscal policy-making in 13 Mediterranean countries. In each of these countries, the most significant sector is investigated. The transport sector in Lebanon is the predominant sector in terms of energy consumption and its associated air pollution impacts. A multidisciplinary effort is carried out for this purpose in which measurement and modeling of air pollution caused by motor vehicles, determination of the quantitative relationship between pollutants and public health, and an estimation of the effects of air pollution on public health have been carried out. This study is concluded by highlighting the mitigation options applicable for the country and for similar developing nations from social and economic points of view.PublishedN/
Depolarization and decreased surface expression of K+ channels contribute to NSAID-inhibition of intestinal restitution
No full textNon-steroidal anti-inflammatory drugs (NSAIDs) contribute to gastrointestinal ulcer formation by inhibiting epithelial cell migration and mucosal restitution; however, the drug-affected signaling pathways are poorly defined. We investigated whether NSAID inhibition of intestinal epithelial migration is associated with depletion of intracellular polyamines, depolarization of membrane potential (Em) and altered surface expression of K+ channels. Epithelial cell migration in response to the wounding of confluent IEC-6 and IEC-Cdx2 monolayers was reduced by indomethacin (100μM), phenylbutazone (100μM) and NS-398 (100μM) but not by SC-560 (1μM). NSAID-inhibition of intestinal cell migration was not associated with depletion of intracellular polyamines. Treatment of IEC-6 and IEC-Cdx2 cells with indomethacin, phenylbutazone and NS-398 induced significant depolarization of Em, whereas treatment with SC-560 had no effect on Em. The Em of IEC-Cdx2 cells was: −38.5±1.8mV under control conditions; −35.9±1.6mV after treatment with SC-560; −18.8±1.2mV after treatment with indomethacin; and −23.7±1.4mV after treatment with NS-398. Whereas SC-560 had no significant effects on the total cellular expression of Kv1.4 channel protein, indomethacin and NS-398 decreased not only the total cellular expression of Kv1.4, but also the cell surface expression of both Kv1.4 and Kv1.6 channel subunits in IEC-Cdx2. Both Kv1.4 and Kv1.6 channel proteins were immunoprecipitated by Kv1.4 antibody from IEC-Cdx2 lysates, indicating that these subunits co-assemble to form heteromeric Kv channels. These results suggest that NSAID inhibition of epithelial cell migration is independent of polyamine-depletion, and is associated with depolarization of Em and decreased surface expression of heteromeric Kv1 channels.ID: S0006295207001931; M3: Article; Accession Number: S0006295207001931; Author: L.C. Freeman (b); Author: D.F. Narvaez (a); Author: A. McCoy (a); Author: F.B. von Stein (c); Author: S. Young (b); Author: K. Silver (a); Author: S. Ganta (b); Author: D. Koch (b); Author: R. Hunter (b); Author: R.F. Gilmour (c); Author: J.D. Lillich (a, ⁎); Affiliation: Department of Clinical Sciences, Kansas State University, Manhattan, KS 66506, United States; Affiliation: Department of Anatomy and Physiology, Kansas State University, Manhattan, KS 66506, United States; Affiliation: Department of Biomedical Sciences, Cornell University, Ithaca, NY 14853, United States; Keyword: Non-steroidal anti-inflammatory drugs; Keyword: Intestinal epithelial cells; Keyword: Membrane potential; Keyword: Potassium channels; Number of Pages: 12; Language: English;Source type: Electronic(1)http://search.ebscohost.com/login.aspx?direct=true&db=edselp&AN=S0006295207001931&site=eds-live&scope=sit
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