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  • 1
    Electronic Resource
    Electronic Resource
    Spectroscopic detection of a tungsten-carbene complex derived from the tungsten hexachloride/tetramethyltin metathesis catalyst system in CD2Cl2 (1987)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 8 (1987), S. 269-271 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1987.030080603
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The use of crossflow to improve nonwoven melt-blown fibers (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 279-288 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A stream of unheated crossflow air has been used to make finer melt-blown fibers. Not only are smaller average fiber diameters obtained, but the variation in fiber diameter is smaller. The use of this technique can allow the production of melt-blown nonwovens, which have finer fibers and more uniform webs. Since unheated air is used in the crossflow jet, the fiber enhancement in terms of finer, stronger fibers can be achieved with an energy savings by substituting unheated crossflow air for a portion of the primary air.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070440212
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  • 3
    Electronic Resource
    Electronic Resource
    Empirical models for melt blowing (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 159-163 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A large data set obtained for melt blowing using a single hole die has been used to develop empirical models which express final average fiber diameter as a function of dimensionless independent variables. The resulting empirical models or equations have been compared to multihole melt-blowing die data. The conclusion of this investigation is that appropriate first-order variables have been identified and the dependence of average final fiber diameter on the independent variables has been established. The resulting model should prove very useful for use in melt-blowing process control and in the design of melt-blowing equipment for polypropylene with an MFR between 500 and 900. © 1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580117
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal transitions in reduced wool fibers (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 12 (1968), S. 1992-1996 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1968.070120821
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  • 5
    Electronic Resource
    Electronic Resource
    The search for correlation between electrokinetic phenomena and blood thrombus formation on implant materials (1968)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 2 (1968), S. 51-79 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Bioelectric charge transfer at the blood-wall interface may be a crucial factor affecting thrombosis on implant materials. A program of studies was conducted to determine the electrokinetic and other physical properties of a wide spectrum of materials including organic polymers, metals, inorganics, heterogeneous compounds, and animal tissue. From these tests, materials were selected for in-vivo cannulation experiments. In this manner, a search was made to find a correlation between surface charge characteristics and thrombosis on cardiovascular implant materials. It was found that materials exhibiting a substantial positive charge were prone to rapid thrombosis. No clear correlation can be stated, as yet, regarding the thrombogenecity of highly charged negative surfaces or slightly charged surfaces. However, many heterogeneous materials have exhibited prolonged in-vivo patency. It appears necessary to isolate surface effects from volumetric effects to seek the role of bioelectric charge transfer in blood thrombus formation.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820020105
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  • 6
    Electronic Resource
    Electronic Resource
    The search for the nonthrombogenic property of colloidal graphiteThis work was supported by a grant from The John A. Hartford Foundation, Inc. (1970)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 4 (1970), S. 121-138 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The nonthrombogenic property of the graphite-Benzalkonium-heparin surface has not been consistently attained by those using this coating. In addition, there is mounting evidence that this property is not dependent entirely on the presence of heparin. A series of tests were conducted to further define the properties of colloidal graphite materials, methods of control and possible relationships to thrombus formation. These tests included electrokinetic investigations, dielectric measurements and other physical/chemical property evaluations. It was found that the colloidal graphite coating approximates many properties which are characteristic of animal tissue. However, considerable scatter in the duplication of these properties was encountered. The properties which seemed to separate the Acheson Colloids Company DAG-35 coating from other graphite products were those of porosity and permeability. Control of these parameters may be critical to achieving consistent uniform success.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820040111
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  • 7
    Electronic Resource
    Electronic Resource
    Some observations on the dielectric properties of cardiovascular implant materials (1973)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 7 (1973), S. 445-470 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Bioelectric charge transfer between blood and the vascular wall appears to play a significant role in maintaining vascular homeostasis. Since the surface charge characteristics of the vessel wall are a function of the dielectric properties of the material, a study was made of the dielectric characteristics of various ion permeable materials and their relationship to electrokinetic phenomena and thrombogenicity. The dielectric properties of the ion permeable materials and of animal tissue were determined and found to be strikingly similar. Several models of electrodiffusion phenomena are reviewed with respect to dielectric properties. The electro-osmotic characteristics of animal tissue and ion permeable materials were investigated, and it was found that animal tissue exhibited electro-osmotic characteristics to a greater degree than did any other man-made materials. The propensity of a material to electro-osmose could not be predicted from the dielectric properties. In addition, no correlation could be found between thrombogenicity and dielectric properties. Dielectric relaxation phenomena is reviewed, and its possible contribution to nonthrombogenicity through the generation of a uniform, constant wall surface charge is presented. It is concluded that to mimic the ion content and mobility characteristics of animal tissue, as determined by dielectric properties, is insufficient to preclude thrombus formation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820070507
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  • 8
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    Deformation and fatigue behavior of SSME turbopump blade materials (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Directionally solidified and single crystal superalloys which are intended for use as turbopump blade materials are anisotropic both elastically and plastically. Therefore, isotropic constitutive models must be modified. Several models which are now being developed are based on metallurgical theories of deformation in these types of alloys. However, these theories have not been fully justified, and the temperature and strain regimes over which they may be valid are poorly defined. The objective of this work is to study the deformation behavior of the alloys, in order to determine the validity of these models and to thereby support the ongoing research efforts in solid mechanics.
    Keywords: METALLIC MATERIALS
    Type: NASA. Lewis Research Center Structural Integrity and Durability of Reusable Space Propulsion Systems; p 65-81
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Constitutive Cyclic Deformation Behavior in Single-crystal and Directionally Solidified SSME High-pressure Fuel Turbopump Airfoil Materials (1985)
    In:  CASI
    Details
    Publication Date: 2014-09-04
    Description: The major goal of the project is to correlate mechanical properties with microstructural deformation behavior and to develop models for constitutive response under a variety of monotonic and cyclic loading cycles, temperatures, strain levels, strain rates, and environments. Two alloys are being studied as candidate SSME turbine blade materials. The first is PWA 1480, which is a single-crystal alloy whose nominal composition is reported. The second alloy being studied is D.S. Mar-M 246 + Hf. This is a directionally solidified material, and its nominal composition is also reported. The major areas of interest for the two materials will be slightly different. The single-crystal alloy lends itself well to fundamental deformation studies, since resolved shear stresses on slip planes are all known and only one grain is present. The D.S. material presents an excellent opportunity to study the effects of slightly misaligned grains on deformation behavior. The two materials will be studied by using approximately the same test matrix, so a good degree of direct comparison will also be possible.
    Keywords: METALLIC MATERIALS
    Type: NASA. Lewis Research Center Struct. Integrity and Durability of Reusable Space Propulsion Systems; p 163-169
    Format: text
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  • 10
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    The effects of temperature and strain rate on the yielding behavior of the single crystal superalloy PWA 1480 (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Interrupted tensile tests were conducted on (001) oriented single crystals at temperatures from 20 to 1093 C. Two strain rates were used, 0.5 and 50 percent/min. After the tests, the deformation substructures were characterized by transmission electron microscopy. Results of these tests are given.
    Keywords: METALLIC MATERIALS
    Type: NASA. Lewis Research Center, Nonlinear Constitutive Relations for High Temperature Applications, 1986; p 291-294
    Format: application/pdf
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