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  • Polymer and Materials Science  (4)
  • Trichogrammatidae  (2)
  • kairomone  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical ecology 5 (1979), S. 673-680 
    ISSN: 1573-1561
    Keywords: Trichogramma ; Hymenoptera ; Trichogrammatidae ; kairomone ; Heliothis zea ; biological control ; pest management ; parasitoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A kairomone from adultHeliothis zea (Boddie) scales is an important factor in the host selection process ofTrichogrammapretiosum Riley. If the host density is sufficiently high (i.e., 1 egg/500 cm2) and higher), a complete coverage or solid treatment of kairomone spray may be the optimum for increasing parasitization rates, but this is not the case at lower host densities (e.g., 1 egg/2000 cm2). At the lower densities, the kairomone must be distributed in such a way as to retain the parasitoids in the target area without inhibiting their movement from one ovi-position site to the next. Simulated moth scale particles appear to fill this need since their density can be regulated to provide the optimum frequency of parasitoid stimulation and thus maximum rates of parasitization at prevailing host densities.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical ecology 7 (1981), S. 909-917 
    ISSN: 1573-1561
    Keywords: Trichogramma pretiosum ; Hymenoptera ; Trichogrammatidae ; biological control ; kairomone ; Heliothis zea ; Lepidoptera ; Noctuidae ; host density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Trichogramma pretiosum Riley females exhibit success-motivated searching after oviposition. The stimulatory effect of contact with host eggs makes host-egg density an important factor in determining the appropriate strategy for behavioral manipulation, using kairomones, that simulate host seeking, in biological control programs. Host eggs can be used, in conjunction with kairomones or by themselves, to improve the performance of these important beneficial insects.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 34 (1983), S. 153-153 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 48 (1976), S. 257-257 
    ISSN: 0009-286X
    Keywords: Schwingungsanregung ; Rohrbündel ; Wärmeaustauscher ; Wirbelablösungen ; aeroelastische Koppelung ; Galloping-Instabilität ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 3 (1983), S. 233-252 
    ISSN: 0730-6679
    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
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 2 (1993), S. 107-140 
    ISSN: 0730-6679
    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
    Notes: The increasing significance of polypropylene for packing materials is leading to a more widespread use of this semi-crystalline thermoplastic as film, vacuum-formed packagings and blow moldings. This paper deals both with the extrusion of semi-finished ware (film/sheet) and with the biaxial stretching, thermoforming and stretch blow molding of PP. It begins with the influence of cooling on the crystallization and the structure, taking into account various nucleation possibilities. It was found that regranulated scrap as a nucleation additive with PP homopolymer can lead to a fine, spherulitic structure of high crystallinity, which is of particular significance for its use as thermoformed sheet. The relationship between crystallinity or density and mechanical properties was not clear provided there was an influence of defects (e.g. in the spherulite border in the case of a coarse structure). What proved to be dependent on this was both an increase and a decrease in the modulus of elasticity with rising density.With the biaxial stretching of the sheet of PP homopolymer and copolymer in a stretching frame, there were marked differences in the overall properties of the stretched sheets as far as the mechanical strength data were concerned. Whereas, in the case of the copolymer, the stress at break and modulus of elasticity could only be raised slightly, in the case of the homopolymer, increases in Young's modulus of 100% and more were achieved.With biaxial stretching, only a small influence on the cooling rate was noticeable, and yet the effect of the thermal history from the extrusion was particularly marked during the subsequent thermoforming process. There, a coarse structure led to poorer product properties, it is impossible to compensate this by varying the forming temperature or the mold temperature. The forming temperature nevertheless proved to be the decisive parameter for the quality of the molding; as the forming temperature rises, there is a major increase in the molding accuracy of the radii and in the gloss. The thermal shrinkage drops. We can conclude from this that polypropylene should be formed just below its melt point.With the aid of theoretical observations, the cooling and conditioning phase for a PP stretch-blowing process are explained “out of first heat”, which was realized and examined in a machine concept - 8-stage machine. With cycle times of approximately 15 s, it was possible to manufacture 1 1 bottles with a crystallinity of 40-45%.
    Additional Material: 49 Ill.
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