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  • Chemistry  (47.186)
  • ENERGY PRODUCTION AND CONVERSION  (2.591)
  • 2005-2009  (109)
  • 1980-1984  (36.306)
  • 1955-1959  (13.362)
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  • 1
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    Reactive halogen chemistry in volcanic plumes (2007)
    AGU
    Details
    Publikationsdatum: 2023-01-19
    Beschreibung: Bromine monoxide (BrO) and sulphur dioxide (SO2) abundances as a function of the distance from the source were measured by ground-based scattered-light Multi AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) in the volcanic plumes of Mt. Etna on Sicily, Italy in August-October 2004 and May 2005 and Villarica in Chile in November 2004. BrO and SO2 spatial distributions in a cross section of Mt. Etna’s plume were also determined by Imaging DOAS. We observed an increase in the BrO/SO2 ratio in the plume from below the detection limit near the vent to about 4.5 x 10-4 at 19 km (Mt. Etna) and to about 1.3 x 10-4 at 3 km (Villarica) distance, respectively. Additional attempts were undertaken to evaluate the compositions of individual vents on Mt. Etna. Furthermore, we detected the halogen species ClO and OClO. This is the first time that OClO could be detected in a volcanic plume. Using calculated thermodynamic equilibrium compositions as input data for a one–dimensional photochemical model, we could reproduce the observed BrO and SO2 vertical columns in the plume and their ratio as function of distance from the volcano as well as vertical BrO and SO2 profiles across the plume with current knowledge of multiphase halogen chemistry, but only when we assumed the existence of an ”effective source region”, where volcanic volatiles and ambient air are mixed at about 600°C (in the proportions of 60% and 40%, respectively)
    Beschreibung: Published
    Beschreibung: D06311
    Beschreibung: 3V. Proprietà chimico-fisiche dei magmi e dei prodotti vulcanici
    Beschreibung: JCR Journal
    Beschreibung: open
    Schlagwort(e): Chemistry ; Volcanic Plumes ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
  • 2
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    Calidad ambiental de la zona costera del Golfo de Batabanó, Cuba (2008)
    CONyMA
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: The anthropogenic affectation was evaluated on the coast N of the Gulf of Batabanó in May 2003 (corresponding to the provinces of Matanzas and Havana), in areas located in the line of the coast. The results were compared with the historical information of the sector. In the coast N and the Ensenada of the Broa, the parameters oxygen saturation, DBO5 and DQO showed characteristic high values of eutrofication. The biggest contribution in the Cianoficies was in the near coastal areas to sources of organic contamination. In the case of the nutrients they show specific data of mesothrofic waters with tendency to the eutrofization and the silts presented a high affectation for toxic metals. The area near to Guanímar is distinguished to present conditions of organic contamination that favor heterothrofic conditions, corroborated by a prevalence of the processes of mineralization of the organic matter over primary production and lows values of fitoplankton concentration. On the contrary, in the region of Surgidero of Batabanó, the processes of synthesis of organic matter prevail suggested by a high primary production, and concentration of fitoplankton, with low breathing levels and mineralization of the organic matter, that indicates that the system is behaving autothrofically. In a general way, this sector is very affected by the anthropogenic impact. The information obtained is of great importance for the development of the fishing and tourist industries in the area.
    Beschreibung: Published
    Schlagwort(e): Phytoplankton ; Water quality ; Primary production ; Chemistry ; Environmental monitoring ; Phytoplankton ; Water quality ; Primary production ; Chemistry ; Environmental monitoring
    Repository-Name: AquaDocs
    Materialart: Proceedings Paper
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
  • 3
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    Ecological and fisheries development of Lake Manzalah (Egypt): hydrography and chemistry of Lake Manzalah (2006)
    Alexandria: National Institute of Oceanography and Fisheries
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: This journal is published by the NIOF, Egypt
    Beschreibung: Lake Manzalah; the largest delta Lake in Egypt represents a dynamic system that has been undergoing continuous and pronounced changes since long times. In the last year’s this Lake faced drastic problems that retarded its environmental and fisheries development; the most serious one is the discharge of waste water. It is attempted in the present study to investigate the chemical characters of Lake Manzalah water during 2001-2002. Water temperature ranged from an average of 12.35oC in January and 29.14oC in July. Dissolved Oxygen, pH and total dissolved solids were found in ranges optimum for the living of marine and freshwater fish species. The average concentrations of nutrients lied in the following ranges: 1.24 to 4.89 μmol PO4 -3 l-1 , 5.08 to 28.73 μmol SiO4 -2 l-1 and 1.81 to 17.7 μ_mol NO3-1 l-1 The concentrations of phosphorus and nitrogen compounds were found to be relatively higher at the southern regions of the Lake near to the outlets of the drains.
    Beschreibung: NIOF
    Beschreibung: Published
    Schlagwort(e): Hydrography ; Water ; Chemistry ; Chemical composition ; Water content ; Environment ; Chemical composition ; Environments ; Water content ; Fisheries
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed , Article
    Format: 1623488 bytes
    Format: 46916 bytes
    Format: application/pdf
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
  • 4
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    The HAMMONIA chemistry climate model: Sensitivity of the mesopause region to the 11-year solar cycle and CO2 doubling, (2007)
    Details
    Publikationsdatum: 2020-12-21
    Beschreibung: This paper introduces the three-dimensional Hamburg Model of the Neutral and Ionized Atmosphere (HAMMONIA), which treats atmospheric dynamics, radiation, and chemistry interactively for the height range from the earth’s surface to the thermosphere (approximately 250 km). It is based on the latest version of the ECHAM atmospheric general circulation model of the Max Planck Institute for Meteorology in Hamburg, Germany, which is extended to include important radiative and dynamical processes of the upper atmosphere and is coupled to a chemistry module containing 48 compounds. The model is applied to study the effects of natural and anthropogenic climate forcing on the atmosphere, represented, on the one hand, by the 11-yr solar cycle and, on the other hand, by a doubling of the present-day concentration of carbon dioxide. The numerical experiments are analyzed with the focus on the effects on temperature and chemical composition in the mesopause region. Results include a temperature response to the solar cycle by 2 to 10 K in the mesopause region with the largest values occurring slightly above the summer mesopause. Ozone in the secondary maximum increases by up to 20% for solar maximum conditions. Changes in winds are in general small. In the case of a doubling of carbon dioxide the simulation indicates a cooling of the atmosphere everywhere above the tropopause but by the smallest values around the mesopause. It is shown that the temperature response up to the mesopause is strongly influenced by changes in dynamics. During Northern Hemisphere summer, dynamical processes alone would lead to an almost global warming of up to 3 K in the uppermost mesosphere.
    Beschreibung: Published
    Beschreibung: 3903-3931
    Beschreibung: reserved
    Schlagwort(e): Sensitivity ; Chemistry ; 01. Atmosphere::01.01. Atmosphere::01.01.02. Climate
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
  • 5
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    Review of NASA programs in applying aerospace technology to energy (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: NASA's role in energy research and development, with the aid of aerospace technology, is reviewed. A brief history, which began in 1974 with studies of solar energy systems on earth, is presented, and the major energy programs, consisting of over 60 different projects, are described, and include solar terrestrial systems, conservation and fossil energy systems, and space utilization systems. Special attention is given to the Satellite Power System and the isolation of nuclear wastes in space. Emerging prospects for NASA programs in energy technology include bioenergy, and ocean thermal energy conversion, coal extraction and conversion technologies, and support to the nuclear industry in power plant systems safety.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: AAS 80-218 , Annual Meeting Space - Enhancing technological leadership; Oct 20, 1980 - Oct 23, 1980; Boston, MA
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    Energy fact sheet (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-NEWS-RELEASE-80-59 , P80-10088
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
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    Energy fact sheet (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-NEWS-RELEASE-80-59A
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 8
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    Energy: A continuing bibliography with indexes (1982)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: This bibliography lists 881 reports, articles, and other documents introduced into the NASA scientific and technical information system from July 1, 1982 through September 30, 1982.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-SP-7043(35) , NAS 1.21:7043(35)
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 9
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    Unbekannt
    The SPS concept - An overview of status and outlook (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The satellite power system (SPS) concept has been reviewed and assessed in a concept development and evaluation program. This paper presents the results of the assessment in systems definition, environmental factors, social impacts, and comparison of future energy systems. Although no insurmountable objections to SPS have been identified, there remain issues that can be resolved only through further research.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: Energy to the 21st century; Aug 18, 1980 - Aug 22, 1980; Seattle, WA
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 10
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    An overview of NASA's participation in the nation's energy program (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The activities of the NASA Office of Solar Terrestrial System are reviewed. Consideration is given to solar heating and cooling, wind energy systems, solar cells, and the solar thermal power program.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: A new era in technology; Apr 30, 1980 - May 02, 1980; Cocoa Beach, FL
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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