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environmentally benign materials for electronics: A review of current developments and emerging technologies

Environmentally benign materials for electronics: A review o...

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2005 10th International Symposium on Advanced Packaging Materials: Processes, Properties and Interfaces

作者： Lincoln, John D. Ogunseitan, Oladele A. Saphores, Jean-Daniel M. Schoenung, Julie M. Nixon, Hilary Shapiro, Andrew A. Dept. of Chemical Engineering and Materials Science University of California Irvine Program in Industrial Ecology Dept. of Environmental Health Science and Policy UCI Dept. of Planning Policy and Design UCI Dept. of Materials Science University of California Davis Jet Propulsion Laboratory California Institute of Technology Pasadena

ISBN: (纸本)0780390857

Materials used in handheld consumer electronic devices (CEDs), such as cell phones or personal digital assistants, create environmental risks both during procurement and disposal. The increasing global demand for CEDs and recent legislative pressure motivate our review of alternative materials that could make CEDs more environmentally friendly. Hazardous materials considered include brominated flame retardants, lead-based solders, hexavalent chromium, and copper. We survey recent research in the development of environmentally benign replacement materials, provide a brief assessment of the potential environmental, industrial, and economic consequences of their substitution, and assess progress in their industrial application. Identifying appropriate environmentally benign replacement materials provides a starting point for developing environmentally friendly CED prototypes. © 2005 IEEE.

关键词： Consumer electronics

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Initiating environmentally conscious precision agriculture at UMES

Initiating environmentally conscious precision agriculture a...

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2005 ASEE Annual Conference and Exposition: The Changing Landscape of engineering and Technology Education in a Global World

作者： Nagchaudhuri, Abhijit Mitra, Madhumi Brooks, Carolyn Earl, Tracy Conry, Robert Ladd, Gabriel Bland, Geoffrey Department of Engineering and Aviation Sciences Department of Natural Sciences School of Agriculture and Natural Sciences NASA GSFC'S Wallops Flight Facility Observational Science Branch United States Department of Engineering and Aviation Sciences University of Maryland Eastern Shore United States Department of Biology and Environmental Science University of Maryland Eastern Shore United States Biology Education Program UMES France Department of Microbiology School of Agricultural and Natural Sciences University of Maryland Eastern Shore United States UMES France Aviation Science Program Department of Engineering and Aviation Science University of Maryland Eastern Shore United States

Precision agriculture is a combination of modern technologies to improve productivity in farming resulting in environmentally friendly farming and higher profit for the farmers. It involves efficient farm management that utilizes technologies such as GPS receivers;GIS data bases;grid soil sampling;variable-rate application equipment for seed, fertilizers, and pesticides;irrigation;yield monitors;sensors for detecting soil fertility and weed populations;and remote sensing imagery. This paper will report efforts to initiate "precision farming" implementation and research at University of Maryland Eastern Shore (UMES).UMES is an 1890 land grant historically black university and it's mission is consistent with the goals of the endeavor which includes (i) integration of advanced technologies in agricultural practices at UMES with a view to improve productivity with due emphasis on research, education and outreach;(ii) environmental stewardship and (iii) remote observation and analysis. While all aspects of "Precision Agriculture" will be integrated with the project, the initial phase involves (a) extensive data collection to record yield variability using GPS (Global Positioning System) integrated yield monitor, (b) correlating the yield data with the soil characteristics and other pertinent factors to come up with recommendations for variable rate nutrient application, (c) use of GIS (Geographical Information System) databases and maps to record and visualize the data to facilitate interpretation.

关键词： engineering education

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Relative reactivity of contaminant candidate list pesticides to OH radical oxidation

Relative reactivity of contaminant candidate list pesticides...

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2005 Water Quality Technology Conference, WQTC 2005

作者： Shemer, Hilla Sharpless, Charles M. Suffet, I.H. Elovitz, Michael S. Linden, Karl G. Department of Civil and Environmental Engineering Duke University Box 90287 Durham NC 27708-0287 United States Department of Chemistry University of Mary Washington Fredericksburg VA United States Environmental Science and Engineering Program School of Public Health University of California Los Angeles CA United States Water Supply and Water Resources Division U.S. EPA Cincinnati OH United States

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Rapid characterization of the changes in dissolved organic matter polarity and size during water treatment

Rapid characterization of the changes in dissolved organic m...

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AWWA 124th Annual Conference and Exposition: The World's Water Event, ACE 2005

作者： Rosario-Ortiz, Fernando L. Snyder, Shane Rexing, David Suffet, I.H. Southern Nevada Water Authority 1350 Richard Bunker Avenue Henderson NV 89015 United States Environmental Science and Engineering Program UCLA School of Public Health CHS Charles E. Young Drive South Los Angeles CA 90095 United States

ISBN: (纸本)1583213821

Characterization of dissolved organic matter (DOM) is extremely important for water utilities in order to minimize potential detrimental effects of disinfection by-products formation, fouling of membranes and biological re-growth and off-taste and odor occurring in the distribution system. Diverse analytical methods have been developed for the characterization of DOM, mostly relying on complex and lengthy procedures limiting real time information. In addition, most DOM characterization methods include preparation steps, such as changes in pH, which may change the DOM structure and conformation from its natural state. Rapid characterization of DOM and how it evolves throughout treatment processes is needed to be able to modify treatment parameters as needed to minimize the effects of DOM. PRAM (polarity rapid assessment method), fluorescence EEM (excitation emission matrix) and HPLC-SEC (size exclusion chromatography) offer great advantages for the continuous monitoring of DOM changes in treatment facilities with minimum sample preparation steps. These techniques offer the advantage of providing information in short periods of time. This paper assesses the changes in DOM polarity and size characteristics through the water treatment process at the River Mountains Water Treatment Facility in Henderson, Nevada indicating the value of the approach. Initial data shows temporal variation in DOM polarity as wells as differences in the effects of ozone pre-treatment as measured by the PRAM method. Size data indicates minimum differences in molecular weight distributions. A pre-concentration step, required prior to analysis of DOM size distribution, may be inhibiting the detection of differences in molecular weight distributions. Fluorescence data show a reduction in the intensity of the fulvic component between influent and finished waters. © 2005 American Water Works Association.

关键词： Molecular weight distribution

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Zeolite membrane microreactors for fine chemical synthesis

Zeolite membrane microreactors for fine chemical synthesis

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2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005

作者： Zhang, X. Lai, S.M. Lam, K.F. Yeung, K.L. Martin-Aranda, R. Department of Chemical Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Environmental Engineering Program Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Departamento de Quimica Inorganica y Quimica Technica Universidad Nacional de Educacion a Distancia C/Senda del Rey 9 28040-Madrid Spain

ISBN: (纸本)0976798522

Fine chemicals and pharmaceuticals are high value added products that are produced in modest quantities. They are usually seasonal products that are customer specific and have a short shelf life. These characteristics usually placed a significant constraint in their production, such that it is not uncommon to see labour intensive batch processes being used instead of the more efficient continues process. This usually led to a significant waste generation during the scale-up from the laboratory to production scale. In addition, the use of hazardous and often toxic homogeneous catalysts makes the product purification and waste disposal an important issue in today's stringent environmental regulations. Microchemical systems offer a new paradigm for meeting these challenges. Recent advances in the design and fabrication of micromixers, microseparators and microreactors bring closer the realization of desktop miniature factories and micropharmacies. They represent a cheap alternative way for the production of specialty chemicals and pharmaceuticals by a continuas process, allowing simpler process optimization, rapid design implementation, better safety and easier scale-up through replication. This enables rapid product deployment to the marketplace and thus ensuring a significant competitive edge. New basic zeolite catalysts obtained by grafting amino groups onto NaX and CsNaX zeolites exhibit excellent catalytic activities for Knoevenagel condensation reaction between benzaldehyde and ethyl cyanoacetate (ECA), ethyl acetoacetate (EAA) and diethyl malonate (DEM). The CsNaX-NH2 catalyst displays higher conversion compared to aminopropylated MCM-41 for benzaldehyde reaction with ECA and DEM (Figure. 1). The performance of a membrane microreader was tested and compared with that of microreactor, packed bed reactor (PBR) and packed bed membrane reactor (PBMR) for the Knoevenagel condensation reaction of benzaldehyde and ethyl cyanoacetate to produce ethyl-2-cyano-3-phenylacr

关键词： Synthesis (chemical)

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Generative representations in structural engineering

Generative representations in structural engineering

引用

2005 ASCE International Conference on Computing in Civil engineering

作者： Kicinger, Rafal Arciszewski, Tomasz De Jong, Kenneth Civil Environmental and Infrastructure Engineering Department Critical Infrastructure Protection Program George Mason University 4400 University Drive Fairfax VA 22030 Civil Environmental and Infrastructure Engineering Department George Mason University MS 4A6 4400 University Drive Fairfax VA 22030 Computer Science Department George Mason University MS 4A5 4400 University Drive Fairfax VA 22030

ISBN: (纸本)0784407940

This paper proposes a new approach to representing structural system inspired by various models of complex systems. Several types of generative representations of steel structural systems are provided and empirically investigated. These representations utilize various kinds of cellular automata to generate design concepts of steel structures in tall buildings. In the paper, a brief overview of the state-of-the-art in cellular automata and generative design is presented. Next, several types of generative representations of steel structural systems in tall buildings are described. The paper also reports the results of several design experiments. They have shown that generative representations produce novel structural shaping patterns which are qualitatively different than the patterns obtained using traditionally used parameterized representations. They also significantly improve the performance of evolutionary algorithms optimizing the structural systems. Finally, research conclusions are presented and most promising paths of future research are discussed.

关键词： Structural design

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environmentally benign materials for electronics;A review of current developments and emerging technologies

Environmentally benign materials for electronics;A review of...

引用

Materials science and Technology 2005 Conference

作者： Lincoln, John D. Ogunseitan, Oladele A. Saphores, Jean-Daniel M. Schoenung, Julie M. Nixon, Hilary Shapiro, Andrew A. Dept. of Chemical Engineering and Materials Science University of California Irvine HSSOE Irvine CA 92697 Program in Industrial Ecology Dept. of Environmental Health Science and Policy UCI 92697-7070 Dept. of Planning Policy and Design UCI 218D SEI 92697-7075 Dept. of Chemical Engineering and Materials Science University of California 2017 Kemper Hall Davis 95616-5294 Jet Propulsion Laboratory 4800 Oak Grove Dr. Pasadena CA 91109

ISBN: (纸本)0873396456

Materials used in handheld consumer electronic devices (CEDs), such as cell phones or PDAs, create environmental risks both during procurement and disposal. The increasing global demand for CEDs and recent legislative pressure motivate our review of alternative materials that could make CEDs more environmentally friendly. Hazardous materials considered include brominated flame retardants, lead-based solders, hexavalent chromium, copper, and ceramic materials. We survey recent research in the development of environmentally benign replacement materials, provide a brief assessment of the potential environmental, industrial, and economic consequences of their substitution, and assess progress in their industrial application. Identifying appropriate environmentally benign replacement materials provides a starting point for developing environmentally friendly CED prototypes.

关键词： Electronic equipment

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Mesoscale wave energy dissipation over Heterogeneous sediments 29

引用

29th International Conference on Coastal engineering, ICCE 2004

作者： Work, Paul A. Demir, Hüseyin Kaihatu, James M. Voulgaris, George School of Civil and Environmental Engineering Georgia Tech. - Savannah 210 Technology Circle SavannahGA31407 United States Naval Research Laboratory Stennis Space Center MS39529-5004 United States Marine Science Program Dept. of Geological Sciences Univ. of South Carolina ColumbiaSC29208 United States

ISBN: (纸本)9789812562982

Measurements describing the evolution of wave energy spectra as waves propagate across a large shoal are described. The shoal is shore oblique, 2 km by 10 km in extent, with relief of up to three meters over bathymetry with ambient depth 10-12 m. The region is sediment starved, and bottom roughness displays spatial variability due to rock outcrops. Field measurements intended to investigate the effects of this shoal on waves, currents, and sediment transport in its lee reveal strong cross-shore gradients in energy density and energy flux, well outside of the surf zone, in conditions of minimal wind, which are attributed to bottom friction. The dissipation displays the expected frequency dependence, in that it decreases in significance as wave frequency increases, but this trend is not as strong as available theoretical predictions would suggest.

关键词： Sediment transport

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Understanding and managing urbanization-induced stream erosion in Southern California

Understanding and managing urbanization-induced stream erosi...

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California and the World Ocean '02: Revisiting and Revising California's Ocean Agenda - Proceedings of the Conference, CWO '02

作者： Yeager, Matt A. Wise, Darla D. Suffet, I.H. California Regional Water Quality Control Board Los Angeles Region 320 West 4th Street Los Angeles CA 90013 United States Environmental Science and Engineering Program University of California Los Angeles 10833 Le Conte Avenue 46-081 CHS Los Angeles CA 90095-1772 United States Ventura County Flood Control District 800 S. Victoria Avenue Ventura CA 93009-1600 United States

The urbanization-induced stream erosion in Southern California is discussed. The variability in stream response to urbanization across the region is assessed and an assessment methodology and long term monitoring strategy is developed. Urbanization brings significant hydrologic changes to affected watersheds or catchments. Urbanized watersheds produce proportionately greater runoff volumes and PDRs than undeveloped watersheds causing higher peak flows in downstream channels.

关键词： Stream flow

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Remediation of an oil-contaminated experimental freshwater wetland: II. Habitat recovery and toxicity reduction

Remediation of an oil-contaminated experimental freshwater w...

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2005 International Oil Spill Conference, IOSC 2005

作者： Lee, Kenneth Doe, Kenneth G. Lee, Lucila E. J. Suidan, Makram T. Venosa, Albert D. Fisheries and Oceans Canada Maurice Lamontagne Institute P.O. Box 1000 Mont-Joli Que. G5H 3Z4 Canada Environmental Science Center Environment Canada P.O. Box 23005 Moncton NB E1A 6S8 Canada Department of Biology Wilfrid Laurier University Waterloo Ont. N2L 3C5 Canada Department of Civil and Environmental Engineering University of Cincinnati 701 ERC Building P.O. Box 210071 Cincinnati OH 45221-0071 National Risk Management Research Laboratory Oil Spill Program U.S. Environmental Protection Agency 26 W. Martin Luther King Drive Cincinnati OH 45268

A controlled oil spill experiment to determine natural recovery rates and the efficacy of potential remediation strategies in wetland ecosystems was initiated in June 1999 at a site on the St. Lawrence River, Canada dominated by Scirpus pungens. A weathered light crude oil (Mesa) was applied on 16 plots (5 m × 4 m) at the rate of 12 L per plot. Treatment of the plots included: natural attenuation (no treatment), nutrient amendment with granular ammonium nitrate and super triple phosphate, a similar treatment with plants continuously cut back (to evaluate the influence of plant growth on remediation), and a nutrient amendment treatment with sodium nitrate instead of ammonium nitrate. To elucidate the effect of nutrient amendments alone, four unoiled plots were fertilized with ammonium nitrate and triple super phosphate. Sediment samples were routinely recovered for chemical and toxicological analysis over a 21-week period that effectively covered the natural growth season of the plants. Significant changes in biological measures of habitat were observed. S. pungens, the dominant plant species, was tolerant to the oil, and its growth was significantly enhanced above that of the unoiled control by the addition of nutrients. Other biotest organisms (bacteria, Vibrio sp.;invertebrates, Daphnia, Hyalella, and Viviparus sp.) provided additional evidence of both enhanced recovery and potential detrimental effects. GC-MS analysis could not resolve significant changes in the composition of the residual oil as a result of experimental treatments. This discrepancy in the detection of treatment efficacy between the chemical and biological methods may be due to induced tolerance to the contaminant hydrocarbons, changes in the bioavailability of the residual oil associated with stimulated plant growth, and detrimental effects of the type and quantity of bioremediation agents used.

关键词： Wetlands

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