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  • 1
    Electronic Resource
    Electronic Resource
    Systematic study of the genusBrazoria (Lamiaceae), andWarnockia (Lamiaceae), a new genus from Texas (1996)
    Springer
    Plant systematics and evolution 203 (1996), S. 65-82 
    Details
    ISSN: 1615-6110
    Keywords: Lamiaceae ; Brazoria ; Warnockia ; Physostegia ; Macbridea ; Systematics ; cladistics ; Flora of Texas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A revisionary treatment ofBrazoria is rendered. Three taxa are recognized:B. arenaria andB. truncata, the latter with two intergrading morphogeographical varieties: var.truncata and var.pulcherrinma (Lundell)M. W. Turner, comb. nova. A fourth taxon, orignally described asB. scutellarioides, is separated as a new monotypic genus,Warnockia, resulting in the new combinationWarnockia scutellarioides (Engelm. & A. Gray)M. W. Turner. Descriptions, illustrations, a phylogenetic analysis, dot-maps, keys to species and complete synonymy are presented. The relationship ofWarnockia to its most closely related genera,Brazoria, Physostegia andMacbridea, is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985237
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    Paper (German National Licenses)
    Fulltext
  • 2
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    The Effect of Behavioural Indicators of Calf Discomfort Following Routine Procedures on Cow Maternal Care (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-01-06
    Description: Pain causes altered arousal and specific behaviours that are rare at other times (pain indicators). We examined whether beef cows (mean age 6 years) are sensitive to pain indicators in addition to arousal following ear tagging and rubber ring castration (males only, n = 31) of their calf (n = 58). Behavioural pain indicators and activity were recorded continuously for 20 min before and 2 h after handling. The 30 min period posthandling captured the peak of behavioural change during this window. Cow maternal and maintenance behaviours were recorded for 20 min before and for 30 min after calf handling. Principal component (PC) analysis identified two dimensions (48% of the variance) in calf behaviour. Arousal and two active pain indicators loaded onto PC1 were shown by linear mixed models to positively affect some maternal behaviours. Lethargy, passive pain indicators and further active pain indicators loaded onto PC2 did not affect cow behaviour. Castration did not result in male calves receiving more maternal attention. Cows alter maternal behaviour in response to calf activity but not behaviours previously shown to indicate pain. Maternal care peaks soon after calving, but recent calving stress or the subtlety of neonatal behavioural expression may constrain cows in responding to the individual behavioural expression of their calf. Future studies exploring empathy should be aware of the constraints on behavioural expression associated with the neonatal and periparturient period.
    Electronic ISSN: 2076-2615
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Molecular Diversity Preservation International
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    PAPER CURRENT
  • 3
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    Industrial Development in Cities (1995)
    University of Chicago Press
    Details
    Publication Date: 1995-10-01
    Print ISSN: 0022-3808
    Electronic ISSN: 1537-534X
    Topics: Economics
    Published by University of Chicago Press
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    PAPER CURRENT
  • 4
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    Substituent position effects on sunscreen photodynamics: A closer look at methyl anthranilate (2018)
    Elsevier
    Details
    Publication Date: 2018-11-01
    Print ISSN: 0301-0104
    Electronic ISSN: 1873-4421
    Topics: Chemistry and Pharmacology , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 5
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    Structural basis for α-conotoxin potency and selectivity (2009)
    Elsevier
    Details
    Publication Date: 2009-08-01
    Print ISSN: 0968-0896
    Electronic ISSN: 1464-3391
    Topics: Chemistry and Pharmacology , Medicine
    Published by Elsevier
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    PAPER CURRENT
  • 6
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    Magnetic Flux Compression Using Detonation Plasma Armatures and Superconductor Stators: Integrated Propulsion and Power Applications (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: This presentation discusses the use of magnetic flux compression for space flight applications as a propulsion and other power applications. The qualities of this technology that make it suitable for spaceflight propulsion and power, are that it has high power density, it can give multimegawatt energy bursts, and terawatt power bursts, it can produce the pulse power for low impedance dense plasma devices (e.g., pulse fusion drivers), and it can produce direct thrust. The issues of a metal vs plasma armature are discussed, and the requirements for high energy output, and fast pulse rise time requires a high speed armature. The plasma armature enables repetitive firing capabilities. The issues concerning the high temperature superconductor stator are also discussed. The concept of the radial mode pulse power generator is described. The proposed research strategy combines the use of computational modeling (i.e., magnetohydrodynamic computations, and finite element modeling) and laboratory experiments to create a demonstration device.
    Keywords: Spacecraft Propulsion and Power
    Type: Advanced Space Propulsion; Apr 05, 1999 - Apr 08, 1999; Huntsville, AL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Magnetic Flux Compression Concept for Aerospace Propulsion and Power (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The objective of this research is to investigate system level performance and design issues associated with magnetic flux compression devices for aerospace power generation and propulsion. The proposed concept incorporates the principles of magnetic flux compression for direct conversion of nuclear/chemical detonation energy into electrical power. Specifically a magnetic field is compressed between an expanding detonation driven diamagnetic plasma and a stator structure formed from a high temperature superconductor (HTSC). The expanding plasma cloud is entirely confined by the compressed magnetic field at the expense of internal kinetic energy. Electrical power is inductively extracted, and the detonation products are collimated and expelled through a magnetic nozzle. The long-term development of this highly integrated generator/propulsion system opens up revolutionary NASA Mission scenarios for future interplanetary and interstellar spacecraft. The unique features of this concept with respect to future space travel opportunities are as follows: ability to implement high energy density chemical detonations or ICF microfusion bursts as the impulsive diamagnetic plasma source; high power density system characteristics constrain the size, weight, and cost of the vehicle architecture; provides inductive storage pulse power with a very short pulse rise time; multimegajoule energy bursts/terawatt power bursts; compact pulse power driver for low-impedance dense plasma devices; utilization of low cost HTSC material and casting technology to increase magnetic flux conservation and inductive energy storage; improvement in chemical/nuclear-to-electric energy conversion efficiency and the ability to generate significant levels of thrust with very high specific impulse; potential for developing a small, lightweight, low cost, self-excited integrated propulsion and power system suitable for space stations, planetary bases, and interplanetary and interstellar space travel; potential for attaining specific impulses approaching 10 (exp 6) seconds, which would enable missions to the outer planets within ten years and missions at interstellar distances within fifty years.
    Keywords: Spacecraft Propulsion and Power
    Type: Plasmadynamics and Lasers; Jun 19, 2000 - Jun 22, 2000; Denver, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Z-Pinch Pulsed Plasma Propulsion Technology Development (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Fusion-based propulsion can enable fast interplanetary transportation. Magneto-inertial fusion (MIF) is an approach which has been shown to potentially lead to a low cost, small reactor for fusion break even. The Z-Pinch/dense plasma focus method is an MIF concept in which a column of gas is compressed to thermonuclear conditions by an axial current (I approximates 100 MA). Recent advancements in experiments and the theoretical understanding of this concept suggest favorable scaling of fusion power output yield as I(sup 4). This document presents a conceptual design of a Z-Pinch fusion propulsion system and a vehicle for human exploration. The purpose of this study is to apply Z-Pinch fusion principles to the design of a propulsion system for an interplanetary spacecraft. This study took four steps in service of that objective; these steps are identified below. 1. Z-Pinch Modeling and Analysis: There is a wealth of literature characterizing Z-Pinch physics and existing Z-Pinch physics models. In order to be useful in engineering analysis, simplified Z-Pinch fusion thermodynamic models are required to give propulsion engineers the quantity of plasma, plasma temperature, rate of expansion, etc. The study team developed these models in this study. 2. Propulsion Modeling and Analysis: While the Z-Pinch models characterize the fusion process itself, propulsion models calculate the parameters that characterize the propulsion system (thrust, specific impulse, etc.) The study team developed a Z-Pinch propulsion model and used it to determine the best values for pulse rate, amount of propellant per pulse, and mixture ratio of the D-T and liner materials as well as the resulting thrust and specific impulse of the system. 3. Mission Analysis: Several potential missions were studied. Trajectory analysis using data from the propulsion model was used to determine the duration of the propulsion burns, the amount of propellant expended to complete each mission considered. 4. Vehicle Design: To understand the applicability of Z-Pinch propulsion to interplanetary travel, it is necessary to design a concept vehicle that uses it -- the propulsion system significantly impacts the design of the electrical, thermal control, avionics and structural subsystems of a vehicle. The study team developed a conceptual design of an interplanetary vehicle that transports crew and cargo to Mars and back and can be reused for other missions. Several aspects of this vehicle are based on a previous crewed fusion vehicle study -- the Human Outer Planet Exploration (HOPE) Magnetized Target Fusion (MTF) vehicle. Portions of the vehicle design were used outright and others were modified from the MTF design in order to maintain comparability.
    Keywords: Spacecraft Propulsion and Power
    Type: M11-0145
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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