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  • Statistical Physics  (3)
  • Air Transportation and Safety  (2)
  • Leaching  (2)
  • METALLIC MATERIALS  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of earthworm casts affecting herbicide sorption and movement (1996)
    Springer
    Biology and fertility of soils 22 (1996), S. 367-372 
    Details
    ISSN: 1432-0789
    Keywords: Atrazine ; Casts ; Earthworm ; Herbicides ; Leaching ; Metsulfuron methyl ; Sorption ; 2,4-d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334585
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Characteristics of earthworm casts affecting herbicide sorption and movement (1996)
    Springer
    Biology and fertility of soils 22 (1996), S. 367-372 
    Details
    ISSN: 1432-0789
    Keywords: Key words Atrazine ; Casts ; Earthworm ; Herbicides ; Leaching ; Metsulfuron methyl ; Sorption ; 2 ; 4-d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334585
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Comparison between Smoluchowski and Boltzmann approaches for self-propelled rods (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-10-21
    Description: 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
    Keywords: Statistical Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 4
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    Effect of reorientation statistics on torque response of self-propelled particles (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-12-02
    Description: 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
    Keywords: Statistical Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 5
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    Dynamics and density distribution of strongly confined noninteracting nonaligning self-propelled particles in a nonconvex boundary (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-01-15
    Description: 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
    Keywords: Statistical Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 6
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    Influence of convection on eutectic microstructure (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: When the MnBi-Bi eutectic is directionally solidified, it forms fibers of MnBi in a matrix of bismuth. When the material solidified in space at rates of 30 and 50 cm/hr, the average fiber spacing lambda was about one half of the value obtained in cases in which the same material solidified on earth. Neither an altered temperature gradient nor a fluctuating freezing rate are apparently responsible for the change in lambda, and the possibility is studied that natural convection increases lambda on earth by perturbing the compositional field in the melt ahead of the growing solid. A theoretical analysis is conducted along with some experiments. On the basis of the theoretical results for lamellar growth, it is concluded that the spacing lambda increases with increasing stirring, especially at small freezing rates. The experiments indicate that at low growth rates the cross-sectional area of the MnBi blades increases with increased stirring and with decreased growth rate.
    Keywords: METALLIC MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Study of eutectic formation (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A theory was developed for the influence of convection on the microstructure of lamellar eutectics. Convection is predicted to produce a coarser microstructure, especially at low freezing rates and large volume fractions of the minority phase. Similary convection is predicted to lower the interfacial undercooling, especially at low freezing rates. Experiments using spin-up/spin-down were performed on the Mn-Bi eutectic. This stirring had a dramatic effect on the microstructure, not only making it coarser but at low freezing rates also changing the morphology of the MnBi. The coarsering persisted to moderately high freezing rates. At the lowest freezing rate, vigorous stirring caused the MnBi to be concentrated at the periphery of the ingot and absent along the center. Progress was made on developing a technique for revealing the three-dimensional microstructure of the MnBi eutectic by time-lapse videotaping while etching.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-178705 , NAS 1.26:178705
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    UTM UAS Service Supplier Development: Sprint 2 Toward Technical Capability Level 4 (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: 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.
    Keywords: Air Transportation and Safety
    Type: ARC-E-DAA-TN63654 , NASA/TM-2018-220050
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    UAS Service Supplier Checkout: How UTM Confirmed Readiness of Flight Tests with UAS Service Suppliers (2019)
    In:  CASI
    Details
    Publication Date: 2019-12-31
    Description: 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.
    Keywords: Air Transportation and Safety
    Type: ARC-E-DAA-TN76566 , NASA/TM-2019-220456
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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