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  • 1
    Electronic Resource
    Electronic Resource
    A methodology for the design of SFS/SCD circuits for a class of unordered codes (1991)
    Springer
    Journal of electronic testing 2 (1991), S. 261-277 
    Details
    ISSN: 1573-0727
    Keywords: Self-checking circuits ; unordered codes ; strongly fault-secure ; strongly code disjoint ; concurrent error detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract We present two design methods that produce concurrently testable and cascadable combinational blocks for a given logic function. In the first method, the designed block is strongly fault-secure and code-disjoint. Any unordered coding scheme can be used for the input and output. The second method produces designs that are strongly fault-secure and strongly code-disjoint. Here the encoding requires some simple density properties that are seen to be satisfied by the commonly used coding schemes. This makes the method applicable to a larger class of coding schemes than the existing methods. We also show that our designs have lower hardware overhead.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00135442
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  • 2
    Electronic Resource
    Electronic Resource
    Monitoring machine based synthesis technique for concurrent error detection in finite state machines (1996)
    Springer
    Journal of electronic testing 8 (1996), S. 179-201 
    Details
    ISSN: 1573-0727
    Keywords: concurrent error detection ; monitoring machines ; finite state machine synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper discusses a new design methodology for concurrent error detection in synchronous sequential circuits based on the use of monitoring machines. In this approach, an auxiliary sequential circuit, called the monitoring machine, operates in lock-step with the main machine, such that any fault in either of the two machines is immediately detected. This methodology is independent of the fault model. It can be applied to FSMs with pre-encoded states and can also be used for ones being synthesised. It also provides a systematic framework for the combined optimisation of the main and monitoring machines, and for exploring tradeoffs in their implementation. The design of monitored sequential circuits is a two-fold problem; namely one of designing an optimal monitoring machine given the main machine, and the other of encoding the main machine states so that the resulting monitoring machine is minimal. This paper formally discusses the design of both the main and monitoring machines and techniques for their combined optimisation. Tradeoffs in their implementation based on selective fault detection are also examined. Through experimental results, it is shown that the proposed synthesis technique is eminently suitable for the design of low-cost sequential circuits with concurrent error detection. The monitoring machine is less costly than the main machine. It is also not identical to it. As a result, a monitored sequential circuit has significantly lower hardware cost and improved fault coverage than previous implementations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02341823
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  • 3
    Electronic Resource
    Electronic Resource
    Behavior of untreated and crosslinked cotton fibers. I. Contribution of maturity (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 19 (1975), S. 2067-2078 
    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: The physical and structural properties of American Upland cottons of different maturities have been examined carefully in order to identify fiber parameters which make significant contributions to easy-care properties. The cottons studied possess widely different degrees of overall orientation as determined from birefringence measurements and also exhibit slightly different crease recovery angles. These cottons also respond differently to swelling in sodium hydroxide solution of different concentrations. The physical and mechanical properties of these cottons modified by formaldehyde crosslinking are also compared. The increase in crease recovery angles and the concomitant tensile losses vary from cotton to cotton but are not dependent on maturity or fineness. The stiffness of crosslinked fibers decreases rather than increases with increasing bound formaldehyde. A comparison of the changes in the mechanical properties of formaldehyde-crosslinked cottons differing widely in orientation suggests that cottons with very high orientation are not suitable for chemical modification to impart durable press properties.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1975.070190801
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  • 4
    Electronic Resource
    Electronic Resource
    Birefringence of native, alkali-swollen, and crosslinked cotton fibers (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 273-277 
    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: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070200123
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  • 5
    Electronic Resource
    Electronic Resource
    Behavior of untreated and crosslinked cotton fibers. II. Contribution of intrinsic fiber properties (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 19 (1975), S. 2079-2086 
    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: The mechanical properties of extracted and formaldehyde-crosslinked cotton fibers are presented. The crease recovery angles of different cotton fibers are more or less the same. As the per cent bound formaldehyde increases, the crease recovery angle of the treated fibers increases while the tensile strength decreases. Crease recovery and tensile loss factors appear to be sensitive indices of the improvement in crease recovery angles and the concomitant losses in tenacity of the fibers modified by any crosslinking process. The crease recovery angles for any cotton modified by formaldehyde crosslinking depend on the pretreatment it has received.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1975.070190802
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  • 6
    Electronic Resource
    Electronic Resource
    Shrinkage and mechanical properties of poly(ethylene terephthalate) filaments treated with various organic solvents (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 1601-1618 
    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: The effects of a number of chemically nonreacting organic on shrinkage and stress-strain properties of preoriented semicrystalline poly(ethylene terephthalate) filaments have been studied. The changes in shrinkage and mechanical properties are found to be highly dependent on time and temperature, as well as on tension applied on the yarn during the treatment. The changes brought about by the solvents at lower temperatures (i.e., below 100°C) are either comparable with or more than those produced by thermal treatments in air or silicone oil above 200°C. The possibility of using slovent treatment for setting polyester for dimensional stability at low temperature as an alternative to the normal dry-heat-setting method has been discussed.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070250808
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  • 7
    Electronic Resource
    Electronic Resource
    Vibrational spectroscopic study of poly(ethylene terephthalate) crystallized by annealing in the oriented state (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 223-230 
    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: Poly(ethylene terephthalate) filament yarn has been annealed in nitrogen atmosphere, in silicone oil, or in nonreacting organic solvents. Morphological changes resulting from the annealing processes have been followed by Raman spectroscopy. Crystallinity, as evidenced by the width of the 1730 cm-1 carbonyl stretching vibration, is shown to affect the macroscopic properties of these filaments. Furthermore, these spectroscopic results, together with shrinkage measured, suggest that the shrinkage and the crystallization processes in the polymer fiber proceed at different rates in different fluid media.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260121
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on heating and cooling of synthetic fibers, yarns, and fabrics. I. Properties of nylon and polyester filament yarns on heat setting in silicone oil (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 2357-2377 
    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: Nylon 6, nylon 66, and polyester [poly(ethylene terephthalate)] filament yarns were heat set at different temperatures in oil under a variety of experimental conditions. The effect of time of heat setting, tension on the yarn during heat setting, as well as the effect of the initial tenacity and extension on subsequent changes in the mechanical properties of the heat-set yarns have been studied. The breaking strength, elongation at break, and work of rupture have been found to be different for samples heat set while slack and at constant length. The breaking strength remains more or less constant over a wide range of heat setting temperatures up to 240°C in the case of nylon 66 and polyester, and up to 200°C in the case of nylon 6, contrary to the observations of Dumbleton et al. When treated in the slack condition, the breaking extension increases by about 1-2.5 times the control value, while heat setting at constant length produces a decrease in the case of nylon 66 and a marginal increase in the case of nylon 6 and polyester. The initial modulus decreases irrespective of the conditions under which the filaments are heat set. From measurements of the shrinkage and the residual shrinkage in boiling water it appears that dimensional stability can be achieved by heat setting even at constant length. Heat setting produces significant improvement in the crease recovery and resiliency of the fibers. Heat setting has also been found to significantly increase the overall crystallinity of the fibers as determined by critical dissolution time and parallel and perpendicular refractive indices. The overall orientation of the polymer chains, as determined from sonic velocity measurements, decreases on heat setting in the slack condition. Heat setting at constant length produces a marginal improvement in the overall orientation only in the case of nylon 66 yarns. Shrinkage occurs instantaneously. Crystallinity, on the other hand, improves with increasing time of heat setting.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070220825
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  • 9
    Electronic Resource
    Electronic Resource
    Wide-angle X-ray diffraction studies of nylon-ionomer blends (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 2247-2260 
    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: Blends of nylon 6 with poly(acrylic acid) polyacrylamide, poly(ethylene-co-acrylic acid), poly(ethylene-co-vinyl alcohol), poly(acrylamide-co-acrylic acid), and polypropylene were prepared by melt blending. Annealing treatments included treatments in Vacuum, in water, and in 20% formic acid at various temperatures. WAXS (wide-angle X-ray scattering) patterns of melt chips and of undrawn, drawn and textured yarns were obtained. The melt chips of 100% nylon 6 crystallize in the α form while the chips of all the blends exhibit a single diffracton ring. All the blends behave similarly during different annealing treatments. When annealed in 20% formic acid at 102°C, the α structure results. The as-spun fibers of nylon 6 and of the blends with poly(acrylamide-co-acrylic acid) and poly(ethylene-co-vinyl alcohol) exhibit a broad diffraction maximum in the region 2θ = 19-25°. The α content and its purity increase with increasing severity of the annealing treatment. The as-spun fibers of the blend with poly(acrylic acid), on the other hand, exhibit a highly oriented γ structure which is highly resistant to conversion to the α from during the annealing treatments. Only when treated in 20% formic acid at 102° does the pure α form result. The drawn textured yarns of nylon 6 exhibit both the α and the γ forms. However, the γ content of the textured yarns from the blends varies with the type and concentration of the additives. The textured yarns from the blends with low levels (0.125%) of poly(acrylic acid) have a very high α content. It is very unusual that the as-spun fibers with almost pure γ structure, when drawn, produce a structure with a high α content.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280711
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  • 10
    Electronic Resource
    Electronic Resource
    Spectroscopic study of rigid-rod polymers. I. Structures of model compounds (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 19 (1981), S. 1475-1488 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(p-phenylene benzbisoxazole) and poly(p-phenylene benzbisthiazole) belong to the class of extended-chain, rigid-rod polymers possessing high modulus, high strength, and good thermal and oxidative resistance. Fibers and films of these polymers are processed from anisotropic solutions in strong acids such as methane sulfonic acid or polyphosphoric acid. The electronic absorption and vibrational spectra of the model compounds have been investigated in order to characterize the structures in the solid state and in nonprotonic solvents. The dramatic intensity differences in the spectra obtained have been interpreted by variations in the dihedral angle between the plane of the phenyl group and the plane of the central heterocyclic ring which affect the resonance configuration between the two rings.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.180191001
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