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  • Statistical Physics  (3)
  • Air Transportation and Safety  (2)
  • Leaching  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Biology and fertility of soils 22 (1996), S. 367-372 
    ISSN: 1432-0789
    Schlagwort(e): Key words Atrazine ; Casts ; Earthworm ; Herbicides ; Leaching ; Metsulfuron methyl ; Sorption ; 2 ; 4-d
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Various physical and chemical characteristics of earthworm casts collected from a laboratory incubation and a field experiment were examined in relation to their effect on the sorption and the movement of three 14C-labelled ionic herbicides: atrazine, 2,4-dichlorophenoxy-acetic acid, and metsulforon methyl. The earthworm casts contained higher levels of fine fractions and total and soluble C. This is attributed to the grinding action of the earthworm gut and selective feeding on zones with higher organic matter and fine size fractions. The earthworm casts had a higher pH than the source soil, resulting in a higher number of surface negative charges. The earthworm casts sorbed higher amounts of herbicides than the source soil, mainly due to the increases in the amount of organic C and fine size fractions. The increased sorption of herbicides by the casts resulted in decreased leaching.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Biology and fertility of soils 22 (1996), S. 367-372 
    ISSN: 1432-0789
    Schlagwort(e): Atrazine ; Casts ; Earthworm ; Herbicides ; Leaching ; Metsulfuron methyl ; Sorption ; 2,4-d
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Various physical and chemical characteristics of earthworm casts collected from a laboratory incubation and a field experiment were examined in relation to their effect on the sorption and the movement of three 14C-labelled ionic herbicides: atrazine, 2,4-dichlorophenoxyacetic acid, and metsulforon methyl. The earthworm casts contained higher levels of fine fractions and total and soluble C. This is attributed to the grinding action of the earthworm gut and selective feeding on zones with higher organic matter and fine size fractions. The earthworm casts had a higher pH than the source soil, resulting in a higher number of surface negative charges. The earthworm casts sorbed higher amounts of herbicides than the source soil, mainly due to the increases in the amount of organic C and fine size fractions. The incrased sorption of herbicides by the casts resulted in decreased leaching.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Publikationsdatum: 2015-10-21
    Beschreibung: Author(s): Eric Bertin, Aparna Baskaran, Hugues Chaté, and M. Cristina Marchetti Considering systems of self-propelled polar particles with nematic interactions (“rods”), we compare the continuum equations describing the evolution of polar and nematic order parameters, derived either from Smoluchowski or Boltzmann equations. Our main goal is to understand the discrepancies betwe… [Phys. Rev. E 92, 042141] Published Tue Oct 20, 2015
    Schlagwort(e): Statistical Physics
    Print ISSN: 1539-3755
    Digitale ISSN: 1550-2376
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2015-12-02
    Beschreibung: Author(s): Benjamin Hancock and Aparna Baskaran We consider the dynamics of self-propelled particles subject to external torques. Two models for the reorientation of self-propulsion are considered: run-and-tumble particles and active Brownian particles. Using the standard tools of nonequilibrium statistical mechanics we show that the run and tumb… [Phys. Rev. E 92, 052143] Published Mon Nov 30, 2015
    Schlagwort(e): Statistical Physics
    Print ISSN: 1539-3755
    Digitale ISSN: 1550-2376
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2015-01-15
    Beschreibung: Author(s): Yaouen Fily, Aparna Baskaran, and Michael F. Hagan We study the dynamics of nonaligning, noninteracting self-propelled particles confined to a box in two dimensions. In the strong confinement limit, when the persistence length of the active particles is much larger than the size of the box, particles stay on the boundary and align with the local bou... [Phys. Rev. E 91, 012125] Published Wed Jan 14, 2015
    Schlagwort(e): Statistical Physics
    Print ISSN: 1539-3755
    Digitale ISSN: 1550-2376
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2019-07-12
    Beschreibung: NASA's UAS Traffic Management (UTM) Project has been tasked with developing concepts and initial implementations for integrating and managing small unmanned aircraft systems (UAS) into the low altitude airspace. To accomplish this task, the UTM Project planned a phased approach based on four Technical Capability Levels (TCLs). As of this writing, TCL4 is currently in development for a late Spring 2019 flight demonstration. This TCL is focused on operations in an urban environment and includes the handling of high density environments, large-scale off-nominal conditions, vehicle-to-vehicle communications, detect-and-avoid technologies, communication requirements, public safety operations, airspace restrictions, and other related goals. Through research and testing to date, NASA has developed an architecture for UTM that depends on commercial entities collaboratively providing services that are traditionally provided by the Air Navigation Service Provider (ANSP) in manned aviation. A key component of this architecture is the UAS Service Supplier (USS), which acts as a communications bridge between UAS operators and the ANSP when necessary. In addition, the collection of USSs form a USS Network to collaboratively manage the airspace through the sharing of data and the adherence to a standard or set of standards required to participate in this USS Network. This document provides a record of the second of four planned steps in the development of interoperable USSs that will ultimately support TCL4 flight testing and formalization of the overall UTM concept. To develop these USSs and their underlying specifications, NASA has planned a series of "Sprints" to work with industry partners in implementing the features and develop proposed specifications for USSs in order to to participate in TCL4. This report describes Sprint Two. In this Sprint, there was a major theme with four goals. The theme was the development and testing of a new USS discovery system, to better enable USSs to find and communicate with each other. The goals supporting this theme were: participants needed to implement and exercise the discovery service for USS-USS communications; USSs needed to demonstrate strategic deconfliction through operation sharing; the systems were to use discovery to aid in handling off-nominal operations; and finally, there was an investigation of an initial off-nominal reporting capability.
    Schlagwort(e): Air Transportation and Safety
    Materialart: ARC-E-DAA-TN63654 , NASA/TM-2018-220050
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2019-12-31
    Beschreibung: NASA collaborated with industry partners to develop and test the small Unmanned Aircraft System (sUAS) Traffic Management (UTM) research platform, a software prototype used for developing airspace integration requirements for sUAS operations. The lessons learned from these activities will help inform the Federal Aviation Administration (FAA) on what is needed to safely manage sUAS operations. A core component of the UTM platform is the UAS Service Supplier (USS), which acts as a communications bridge to meet the regulatory and operational requirements. As the UTM partners began USS flight tests, NASA found that it was difficult to get all USSs functioning at comparable quality levels to ensure successful flight tests. Also, NASA anticipated that the FAA would encounter similar challenges when they begin to register USSs for operational use. These realizations led to the development of USS Checkout, a set of processes and tools designed to increase flight test efficiency. We learned that a good USS Checkout process is balanced for simplicity versus test coverage, and is amenable to automation. We also learned that when USS Checkout is a USS prerequisite for flight tests, flight tests were more efficient and effective.
    Schlagwort(e): Air Transportation and Safety
    Materialart: ARC-E-DAA-TN76566 , NASA/TM-2019-220456
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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