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  • Aircraft Propulsion and Power  (12)
  • Aircraft Stability and Control; Aircraft Propulsion and Power  (3)
  • Nucleic Acid Chemistry  (2)
  • polyethylene  (2)
  • 1
    Unknown
    Low-Cost Methods for Molecular Characterization of Mutant Plants : Tissue Desiccation, DNA Extraction and Mutation Discovery: Protocols (2015)
    Cham : Springer
    Details
    Keywords: Life sciences ; Nucleic acids ; Plant breeding ; Biology ; Technique ; Life Sciences ; Plant Breeding/Biotechnology ; Biological Techniques ; Nucleic Acid Chemistry
    Description / Table of Contents: Introduction --- Health and Safety Considerations --- Sample Collection and Storage --- Low-Cost DNA Extraction --- PCR Amplification for Low-Cost Mutation Discovery --- Enzymatic Mismatch Cleavage and Agarose Gel Evaluation of Samples --- Alternative Enzymology for Mismatch Cleavage for TILLING and Ecotilling: Extraction of Enzymes form Common Weedy Plants --- Example Data --- Conclusions.  
    Pages: Online-Ressource (X, 35 pages) , 9 illustrations, 3 illustrations in color
    ISBN: 9783319162591
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-16259-1
    Language: English
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    E-BOOK
  • 2
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    Low-Cost Methods for Molecular Characterization of Mutant Plants (2021)
    Springer Nature
    Details
    Publication Date: 2023-03-03
    Description: Plant Breeding/Biotechnology; Biological Techniques; Nucleic Acid Chemistry
    Keywords: Plant Breeding/Biotechnology ; Biological Techniques ; Nucleic Acid Chemistry ; bic Book Industry Communication::K Economics, finance, business & management::KN Industry & industrial studies::KND Manufacturing industries ; bic Book Industry Communication::K Economics, finance, business & management::KN Industry & industrial studies::KND Manufacturing industries::KNDP Pharmaceutical industries ; bic Book Industry Communication::T Technology, engineering, agriculture::TC Biochemical engineering
    Language: English
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    Format: image/jpeg
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    E-BOOK
  • 3
    Electronic Resource
    Electronic Resource
    Electron microscopy of oriented high-density polyethylene: Comparison with small-angle X-ray scattering (1984)
    Springer
    Colloid & polymer science 262 (1984), S. 793-797 
    Details
    ISSN: 1435-1536
    Keywords: electron microscopy ; polyethylene ; morphology ; orientation ; small-angle X-ray scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The morphology of cold-drawn, rolled and annealed high-density polyethylene was investigated by transmission electron microscopy of stained sections. From the electron micrographs, a model of the structure was developed and the scattering pattern calculated. This was then compared with the corresponding small-angle X-ray scattering (SAXS) pattern, in order both to aid in the interpretation of SAXS patterns of oriented polymers, and to assess the effects of staining with chlorosulphonic acid on the morphology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01451709
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Scanning electron microscopy of oriented high density polyethylene (1981)
    Springer
    Colloid & polymer science 259 (1981), S. 252-259 
    Details
    ISSN: 1435-1536
    Keywords: Scanning electron microscopy ; polyethylene ; microfibrillar structure ; lamellar structure ; drawing mechanism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die mikrofibrillare und lamellare Morphologie in kaltverstreckten bzw. kaltverstreckten und anschließend getemperten HD-Polyäthylenplatten wurden mittels Raster-Elektronenmikroskopie untersucht. Kontrastunterschiede an Bruchoberflächen im Falle kaltverstreckten Polyäthylens werden interpretiert durch eine, vom Verstreckmechanismus bedingte, bevorzugte Orientierung der inter-mikrofibrillaren tie-Moleküle in der Plattenebene. An kaltverstreckten/getemperten Platten wurden Lamellenstapel beobachtet, die eine Zwillingsorientierung von geneigten Lamellen aufwiesen. Diese ‚dachförmige’ Struktur wird erzeugt durch eine Scherung innerhalb der Mikrofibrillen während der Mikro-Halsbildung und deutet das bekannte 4-Punkt-Röntgen-Kleiriwinkelbeugungsdiagramm. Zur Auflösung der einzelnen, lamellaren Textur wurde eine leichte Ätzung mit rauchender Salpetersäure benötigt.
    Notes: Summary The microfibrillar and lamellar morphologies in cold-drawn and cold-drawn/annealed high-density polyethylene sheets were observed by means of scanning electron microscopy. Differences in contrast on fracture surfaces for cold-drawn sheet are interpreted in terms of a preferential orientation of inter-microfibrillar tie molecules in the plane of the sheet brought about by the drawing mechanism. In annealed, cold-drawn sheet, stacks of lamellae were observed which showed twinned orientations of inclined lamellae. This “roof-top” structure is interpreted in terms of shear within the individual microfibrils during micronecking, and corresponds to the well-known 4-point small-angle X-ray pattern for this type of specimen. Light etching with fuming nitric acid was necessary in order to resolve the individual lamellar texture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01381769
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    Paper (German National Licenses)
    Fulltext
  • 5
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    Comparisons Between Unsteady Aerodynamic Events in a Gas Turbine Generator and an Identical Compressor Rig (1996)
    In:  CASI
    Details
    Publication Date: 2011-10-14
    Description: Extensive testing done on a T55-L-712 turboshaft engine compressor in a compressor test rig is being followed by engine tests in progress as part of the Army Non-Recoverable Stall Program. Goals include a greater understanding of the gas turbine engine start cycle and compressor/engine operation in the regions 'beyond' the normal compressor stall line (rotating stall/surge). Rig steady state instrumentation consisted of 497 steady state pressure sensors and 153 temperature sensors. Engine instrumentation was placed in similar radial/axial locations and consists of 122 steady state pressure sensors and 65 temperature sensors. High response rig instrumentation consisted of 34 wall static pressure transducers. Rig and engine high response pressure transducers were located in the same axial/radial/circumferential locations in front of the first three stages. Additional engine high response instrumentation was placed in mach probes in front of the engine and on the compressor hub. This instrumentation allows for the generation of detailed stage characteristics, overall compressor mapping, and detailed analysis of dynamic compressor events.
    Keywords: Aircraft Propulsion and Power
    Type: Loss Mechanisms and Unsteady Flows in Turbomachines; AGARD-CP-571
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Space Transportation Propulsion Systems (2001)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: This report outlines the Space Transportation Propulsion Systems for the NPSS (Numerical Propulsion System Simulation) program. Topics include: 1) a review of Engine/Inlet Coupling Work; 2) Background/Organization of Space Transportation Initiative; 3) Synergy between High Performance Computing and Communications Program (HPCCP) and Advanced Space Transportation Program (ASTP); 4) Status of Space Transportation Effort, including planned deliverables for FY01-FY06, FY00 accomplishments (HPCCP Funded) and FY01 Major Milestones (HPCCP and ASTP); and 5) a review current technical efforts, including a review of the Rocket-Based Combined-Cycle (RBCC), Scope of Work, RBCC Concept Aerodynamic Analysis and RBCC Concept Multidisciplinary Analysis.
    Keywords: Aircraft Propulsion and Power
    Type: 2000 Numerical Propulsion System Simulation Review; 59-69; NASA/CP-2001-210673
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Pilot-in-the-Loop Evaluation of a Yaw Rate to Throttle Feedback Control with Enhanced Engine Response (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper describes the implementation and evaluation of a yaw rate to throttle feedback system designed to replace a damaged rudder. It can act as a Dutch roll damper and as a means to facilitate pilot input for crosswind landings. Enhanced propulsion control modes were implemented to increase responsiveness and thrust level of the engine, which impact flight dynamics and performance. Piloted evaluations were performed to determine the capability of the engines to substitute for the rudder function under emergency conditions. The results showed that this type of implementation is beneficial, but the engines' capability to replace the rudder is limited.
    Keywords: Aircraft Stability and Control; Aircraft Propulsion and Power
    Type: AIAA Paper 2012-5027 , E-663889 , AIAA Guidance Navigation and Control Conference; Aug 13, 2012 - Aug 16, 2012; Minneapolis, MN; United States
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    NASA TECHNICAL REPORTS
  • 8
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    Validation of an Integrated Airframe and Turbofan Engine Simulation for Evaluation of Propulsion Control Modes (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The National Aeronautics and Space Administration (NASA) has developed independent airframe and engine models that have been integrated into a single real-time aircraft simulation for piloted evaluation of propulsion control algorithms. In order to have confidence in the results of these evaluations, the integrated simulation must be validated to demonstrate that its behavior is realistic and that it meets the appropriate Federal Aviation Administration (FAA) certification requirements for aircraft. The paper describes the test procedures and results, demonstrating that the integrated simulation generally meets the FAA requirements and is thus a valid testbed for evaluation of propulsion control modes.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN19726 , SciTech 2015; Jan 05, 2015 - Jan 09, 2015; Kissimmee, FL; United States
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  • 9
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    Application and Evaluation of Control Modes for Risk-Based Engine Performance Enhancements (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The engine control system for civil transport aircraft imposes operational limits on the propulsion system to ensure compliance with safety standards. However, during certain emergency situations, aircraft survivability may benefit from engine performance beyond its normal limits despite the increased risk of failure. Accordingly, control modes were developed to improve the maximum thrust output and responsiveness of a generic high-bypass turbofan engine. The algorithms were designed such that the enhanced performance would always constitute an elevation in failure risk to a consistent predefined likelihood. This paper presents an application of these risk-based control modes to a combined engine/aircraft model. Through computer and piloted simulation tests, the aim is to present a notional implementation of these modes, evaluate their effects on a generic airframe, and demonstrate their usefulness during emergency flight situations. Results show that minimal control effort is required to compensate for the changes in flight dynamics due to control mode activation. The benefits gained from enhanced engine performance for various runway incursion scenarios are investigated. Finally, the control modes are shown to protect against potential instabilities during propulsion-only flight where all aircraft control surfaces are inoperable.
    Keywords: Aircraft Stability and Control; Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN16656 , AIAA/ASME/SAE/ASEE Joint Propulsion Conference; Jul 28, 2014 - Jul 30, 2014; Cleveland, OH; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Piloted Simulation Evaluation of a Model-Predictive Automatic Recovery System to Prevent Vehicle Loss of Control on Approach (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper describes a model-predictive automatic recovery system for aircraft on the verge of a loss-of-control situation. The system determines when it must intervene to prevent an imminent accident, resulting from a poor approach. It estimates the altitude loss that would result from a go-around maneuver at the current flight condition. If the loss is projected to violate a minimum altitude threshold, the maneuver is automatically triggered. The system deactivates to allow landing once several criteria are met. Piloted flight simulator evaluation showed the system to provide effective envelope protection during extremely unsafe landing attempts. The results demonstrate how flight and propulsion control can be integrated to recover control of the vehicle automatically and prevent a potential catastrophe.
    Keywords: Aircraft Stability and Control; Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN12553 , Science and Technology Forum and Exposition (SciTech2014); Jan 13, 2014 - Jan 17, 2014; National Harbor, Maryland; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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