Copyright (c) 2009 All rights reserved. http://works.bepress.com/anu Recent documents in Anu Vedantham en-us Sun, 31 May 2009 03:34:27 PDT 3600 http://works.bepress.com/anu/9 http://works.bepress.com/anu/9 Mon, 30 Jun 2008 20:32:39 PDT Global Warming http://works.bepress.com/anu/8 http://works.bepress.com/anu/8 Tue, 13 May 2008 19:59:39 PDT This report assesses the effects of aircraft on climate and atmospheric ozone and is the first IPCC report for a specific industrial subsector. It was prepared by IPCC in collaboration with the Scientific Assessment Panel to the Montreal Protocol on Substances that Deplete the Ozone Layer, in response to a request by the International Civil Aviation Organization (ICAO) because of the potential impact of aviation emissions. These are the predominant anthropogenic emissions deposited directly into the upper troposphere and lower stratosphere. Aviation has experienced rapid expansion as the world economy has grown. Passenger traffic (expressed as revenue passenger kilometers) has grown since 1960 at nearly 9% per year, 2.4 times the average Gross Domestic Product (GDP) growth rate. Freight traffic, approximately 80% of which is carried by passenger airplanes, has also grown over the same time period. The rate of growth of passenger traffic has slowed to about 5% in 1997 as the industry is maturing. Total aviation emissions have increased, because increased demand for air transport has outpaced the reductions in specific emissions from the continuing improvements in technology and operational procedures. Passenger traffic, assuming unconstrained demand, is projected to grow at rates in excess of GDP for the period assessed in this report. Anu Vedantham Global Warming http://works.bepress.com/anu/5 http://works.bepress.com/anu/5 Mon, 05 May 2008 12:07:25 PDT Information technologies are fast becoming an essential part of most sectors of the American economy. Today, more than half of the nation's work force uses computers on the job. Having begun as internal systems in large corporations and universities, computer networks have been embraced by small businesses, individuals, and the non-profit sector. Community organizations have been able to use the new technologies in innovative ways to meet some of the social challenges present in today's inner cities. In the process of adopting these technologies, community organizations have changed the ways they are used and perceived, integrating them into their work in creative and non-traditional ways. Judith Sparrow Education and Technology http://works.bepress.com/anu/4 http://works.bepress.com/anu/4 Mon, 05 May 2008 12:07:21 PDT Telecommunications in many African countries is several years, perhaps decades, behind the state of the art in developed countries. In 1982, nine out of ten people in the United States owned a telephone line; in Africa, only five out of 100 did. Often, telecommunications investments are put on a lower priority at national planning levels in favor of other technologies such as electrification; advances in telecommunications are not often seen as a crucial factor in economic development. However,as the world becomes increasingly dependent on telecommunications for international economic trade and information transfer, the need for modem telecommunications capability becomes more urgent. Anu Vedantham Education and Technology http://works.bepress.com/anu/3 http://works.bepress.com/anu/3 Mon, 05 May 2008 12:07:16 PDT Emissions from airplanes and their potential global effects on the atmosphere have become the subject of intensive study by scientists, and are now drawing the interest of governments. Global fuel consumption has risen much faster for aviation than for other energy-use sectors. Concerns have focused on the contribution of nitrogen oxides (NOx), carbon dioxide (C02), water vapor (H20) and other engine effluents to the buildup of the atmosphere's greenhouse effect. Future aircraft emissions also may affect the stratosphere's ozone layer. This report describes an effort to develop long-term scenarios for emissions from aviation in order to provide a basis for assessing their potential environmental impact throughout the 21st century. Carbon dioxide and nitrogen oxides from the current and projected subsonic aircraft fleets are the main focus of this study. The scenarios in this report were produced by a model that builds on technological and operational assumptions made by industry and government for the period through 2015. It is important to state from the outset what this report is not about. It is not a detailed examination of the environmental effects of aviation. It is not an assessment of the potential for technological or operational changes that could reduce emissions from expected levels. It does not set forth a comprehensive and detailed policy prescription for limiting emissions from aviation. This report does not analyze the potential emissions of a vastly expanded fleet of supersonic aircraft, such as the proposed High-Speed Civil Transport (HSCT), although its possible environmental impacts are discussed briefly. Anu Vedantham Global Warming http://works.bepress.com/anu/2 http://works.bepress.com/anu/2 Fri, 18 Apr 2008 10:09:43 PDT This study presents a dynamical systems model for long-term scenarios of demand in the aviation sector and resultant emissions of CO2 and NOx. We analyze the dynamics of demand growth for aviation, particularly in the emerging markets of developing nations. A model for subsonic aviation emissions is presented that reflects the consequences of industry forecasts for improvement in aviation fuel efficiency and emissions indices as well as projections of global economic and population growth over the next century. (Emissions of commercial supersonic aircraft are not modeled here.) The model incorporates a dynamical system of logistic growth towards a time-dependent capacity level. Using the long-term model, we present a set of projections of demand for aviation services, fossil fuel use, and emissions of carbon dioxide (C02) and nitrogen oxides (NOx through the year 2100; previous forecasts have not extended past 2040. We briefly discuss expectations for the distribution of NOx emissions over altitude and latitude. Anu Vedantham Global Warming http://works.bepress.com/anu/1 http://works.bepress.com/anu/1 Fri, 18 Apr 2008 10:09:40 PDT This article explains the need for quality educational technology in our schools, and notes the contributions of existing technology in improving education. It describes the potential that telecommunications network technology holds for revitalizing American education. It outlines the major federal programs that provide policy guidance and funding assistance for educational institutions to access and contribute to the evolving National Information Infrastructure (NII), and summarizes federal activities to date. In particular it describes the relevant experiences of the first year of the Telecommunications and Information Infrastructure Assistance Program (TIIAP) which is part of the National Telecommunications and Information Administration (NTIA) at the Department of Commerce. Contact information for all federal programs is provided as well. Anu Vedantham Education and Technology