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  • 1
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    A neostriatal habit learning system in humans (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-09-06
    Description: Amnesic patients and nondemented patients with Parkinson's disease were given a probabilistic classification task in which they learned which of two outcomes would occur on each trial, given the particular combination of cues that appeared. Amnesic patients exhibited normal learning of the task but had severely impaired declarative memory for the training episode. In contrast, patients with Parkinson's disease failed to learn the probabilistic classification task, despite having intact memory for the training episode. This double dissociation shows that the limbic-diencephalic regions damaged in amnesia and the neostriatum damaged in Parkinson's disease support separate and parallel learning systems. In humans, the neostriatum (caudate nucleus and putamen) is essential for the gradual, incremental learning of associations that is characteristic of habit learning. The neostriatum is important not just for motor behavior and motor learning but also for acquiring nonmotor dispositions and tendencies that depend on new associations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Knowlton, B J -- Mangels, J A -- Squire, L R -- MH24600/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1996 Sep 6;273(5280):1399-402.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychology, University of California, Los Angeles, CA 90024, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8703077" target="_blank"〉PubMed〈/a〉
    Keywords: Aged ; Amnesia/physiopathology/*psychology ; Diencephalon/physiology/physiopathology ; Female ; Humans ; Learning/*physiology ; Limbic System/physiology/physiopathology ; Male ; Matched-Pair Analysis ; Memory/*physiology ; Middle Aged ; Neostriatum/*physiology/physiopathology ; Parkinson Disease/physiopathology/*psychology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
    Electronic Resource
    Electronic Resource
    The interaction of nitrogen with carbon in furnaces operating at high pressures and temperatures (1982)
    Springer
    Journal of materials science 1 (1982), S. 282-284 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728854
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Fracture of Yttria-Doped, Sintered Reaction-Bonded Silicon Nitride (1985)
    Wiley
    Details
    Publication Date: 1985-07-01
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Wiley on behalf of American Ceramic Society.
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  • 4
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    Characterization of sintered reaction bonded silicon nitride (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: NONMETALLIC MATERIALS
    Type: Society of Automotive Engineers, Inc. Proc. of the 21st Automotive Technol. Develop. Contractors' Meeting; p 307-314
    Format: text
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  • 5
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    Fracture of yttria-doped, sintered reaction-bonded silicon nitride (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Flexural strength of an yttria-doped, slip-cast, sintered reaction-bonded silicon nitride was evaluated as a function of temperature (20 to 1400 C in air), applied stress, and time. Static oxidation at 700 to 1400 C was investigated in detail; in tests at 1000 C in air, the material showed anomalous weight gain. Flexural stress-rupture testing at 800 to 1200 C in air indicated that the material is susceptible to stress-enhanced oxidation and early failure. Fractographic evidence for time-dependent and -independent failures is presented.
    Keywords: NONMETALLIC MATERIALS
    Type: ACS PAPER 7-J3-84 , American Ceramic Society, Journal (ISSN 0002-7820); 68; 413-418
    Format: text
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  • 6
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    Injection molding ceramics to high green densities (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The injection molding behavior of a concentrated suspension of Si powder in wax was studied. It was found that the injection molding behavior was a function of the processing techniques used to generate the powder. Dry ball-milled powders had the best molding behavior, while air classified and impact-milled powders demonstrated poorer injection moldability. The relative viscosity of these molding batches was studied as a function of powder properties: distribution shape, surface area, packing density, and particle morphology. The experimental behavior, in all cases, followed existing theories. The relative viscosity of an injection molding composition composed of dry ball-milled powders could be expressed using Farris' relation.
    Keywords: MECHANICAL ENGINEERING
    Type: American Ceramic Society Bulletin (ISSN 0002-7812); 62; May 1983
    Format: text
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  • 7
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    Sintering of reaction bonded silicon nitride (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A process to produce sintered reaction-bonded Si3N4 (SRBSN) articles has been developed. This process consists of the addition of an appropriate sintering aid to reaction-bonded Si3N4 followed by sintering between 1780 and 2000 C, using an over pressure of nitrogen. The principal advantage of this process is the low sintering shrinkages of 5 to 10 percent. The properties and microstructure of two SRBSN systems sintered with MgO and Y2O3 additives are described and were found to be comparable to corresponding hot-pressed Si3N4 systems. Examples of applications of both systems are illustrated, demonstrating near net shape fabrication capability of the process.
    Keywords: NONMETALLIC MATERIALS
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  • 8
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    The effect of silicon particle size on the nitriding behaviour of reaction bonded Si3N4 compacts (1983)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Keywords: NONMETALLIC MATERIALS
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  • 9
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    Improved silicon carbide for advanced heat engines (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The development of silicon carbide materials of high strength was initiated and components of complex shape and high reliability were formed. The approach was to adapt a beta-SiC powder and binder system to the injection molding process and to develop procedures and process parameters capable of providing a sintered silicon carbide material with improved properties. The initial effort was to characterize the baseline precursor materials, develop mixing and injection molding procedures for fabricating test bars, and characterize the properties of the sintered materials. Parallel studies of various mixing, dewaxing, and sintering procedures were performed in order to distinguish process routes for improving material properties. A total of 276 modulus-of-rupture (MOR) bars of the baseline material was molded, and 122 bars were fully processed to a sinter density of approximately 95 percent. Fluid mixing techniques were developed which significantly reduced flaw size and improved the strength of the material. Initial MOR tests indicated that strength of the fluid-mixed material exceeds the baseline property by more than 33 percent. the baseline property by more than 33 percent.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA, Lewis Research Center, Structural Ceramics; p 63-88
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  • 10
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    Sintered reaction bonded Si3N4 for the AGT 101 turbine rotor (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The sintered reaction reaction bonded Si3N4 (SRBSN) process, with Y2O3 as a sintering aid, was selected for the fabrication of the AGT 101 turbine rotor. Experiments to determine the optimum Y2O3 composition of this system are discussed. The room temperature strength of the optimum material (RM-1) exceeds 700 MPa while the 1200 C strength exceeds 550 MPa. The slip casting fabrication technique employed for the AGT 101 simulated rotor is described. Rotors have been cast, nitrided and sintered. Densities exceeding 97% of theoretical (3.26 g/cc) have been obtained. Problems relating to sintering reproducibility, and the overall quality of the simulated rotors have been identified.
    Keywords: NONMETALLIC MATERIALS
    Type: Contractors Coordination Meeting on Automotive Technology Development; Nov 11, 1980 - Nov 13, 1980; Dearborn, MI
    Format: text
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