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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Agricultural Administration 1 (1974), S. 263-284 
    ISSN: 0309-586X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Wood science and technology 31 (1997), S. 3-16 
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The author gives numerical data resulting from detailed measurements on a common softwood,Picea abies; which can form the basis for the verification of new structural models of wood cell walls. Some suggestions are made for the interpretation of the data, including the development of internal stresses followed by relaxation, molecular destabilisation followed by physical aging during moisture changes, and differing forms of moisture bonding.
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  • 3
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary An adaptor for the conversion of a high-accuracy tensile creep machine to compression loading is described. It was found that a stable mechano-sorptive creep limit could be obtained by a suitable load reduction after moisture cycling; after which further creep and creep recovery just balanced each other. In this stable state the value of the longitudinal moisture-swelling coefficient depended on the strain; being less with tensile strain and more with compressive strain then in the unloaded condition. These differences in the swelling coefficient could explain the apparent recovery during subsequent sorptions in mechanosorptive creep in bending. Such a hypothesis was strongly supported by numerical comparisons of strains in bending, tension and compression.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Non-linearity of softwood in axial mechano-sorptive creep during moisture cycling can be characterised as departure from linear behaviour. Linear behaviour is shown by experimental measurement to be a gradual approach to a creep limit with exponentially decreasing increments of compliance, Ji, per moisture cycle, when tested under a constant stress. On the other hand, when the stress is progressively increased by a small increment Δσ after each moisture cycle, the compliance increments will progressively increase, having a value of $$\Delta \sigma \sum\limits_1^n {{\text{J}}_{\text{i}} }$$ , where n is the cycle number. By subtracting one compliance increment from the succeeding one, the value of Δσ Ji can be obtained. Analysis of experimental results in bending tension and compression showed that the compression test pieces departed from linearity at total strains around 0.14% to 0.15%, the bending test pieces showed slight evidence of non-linearity at about the same strain, whilst the tensile pieces were approximately linear up to 0.18% strain.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary This paper describes the study of possible interactions between the viscoelastic and mechano-sorptive creep inPinus sylvestris. When two periods of constant-moisture creep were separated by a period of mechano-sorptive creep, the expected creep rate during the second viscoelastic period was decreased. A similar effect was observed during creep recovery. These results were taken to indicate an interaction between the two types of creep, although not necessarily a common mechanism. During recovery with uniform moisture cycling, the effects of one extra low and one extra high humidity were observed. The low humidity showed no significant effect, but the high humidity significantly increased the recovery. This was attributed to a parallel effect to that of creep: namely, the creep acceleration that occurs at a higher moisture level than has previously been reached during the test.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In 1971 and 1972 populations of Scolytus scolytus (F.) in several counties in England were heavily parasitized by Parasitaphelenchus oldhami Rühm, but in S. multistriatus (Marsh.) P. oldhami was markedly less abundant. Infestation of S. scolytus was 54 per cent in 1971 and 61 per cent in 1972, while the mean number of parasites per infested beetle was 32 and 41 respectively. For S. multistriatus the comparable figures were 55 per cent in 1971 and 44 per cent in 1972 with means of 12 and 10 parasites per beetle. Despite the high levels of parasitism, no pathological effects on the beetles were observed.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Summary Knowledge of in-situ stress in rock masses is essential for mining and civil engineering design and the Kaiser effect method of stress determination provides an economical alternative to currently applied investigation techniques. A practical problem associated with this method is the loss of the Kaiser effect over time during the process of anelastic strain recovery, but a direct relationship is observed between anelastic strain recovery and the number of acoustic emissions. The behaviour is modelled here using the Kelvin and Burger rheological models, for the stages of creep during uniaxial laboratory loading, anelastic strain recovery and the loss of the Kaiser effect, with constants being calculated and compared for samples loaded under geological and laboratory conditions. It is found that the loss of the KE at low stress levels compares directly with the process of anelastic strain recovery and fits the Burger model over the time scales of interest. A difference between primary and secondary (undercored samples) recovery is demonstrated with a slower recovery for primary relaxation and with samples taken from geological stress environments recovering more slowly than those loaded under laboratory conditions, for all stress levels tested.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Wood science and technology 31 (1997), S. 3-16 
    ISSN: 0043-7719
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The author gives numerical data resulting from detailed measurements on a common softwood, Picea abies 1; which can form the basis for the verification of new structural models of wood cell walls. Some suggestions are made for the interpretation of the data, including the development of internal stresses followed by relaxation, molecular destabilisation followed by physical aging during moisture changes, and differing forms of moisture bonding.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0043-7719
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary This paper describes the study of possible interactions between the viscoelastic and mechano-sorptive creep in Pinus sylvestris. When two periods of constant-moisture creep were separated by a period of mechano-sorptive creep, the expected creep rate during the second viscoelastic period was decreased. A similar effect was observed during creep recovery. These results were taken to indicate an interaction between the two types of creep, although not necessarily a common mechanism. During recovery with uniform moisture cycling, the effects of one extra low and one extra high humidity were observed. The low humidity showed no significant effect, but the high humidity significantly increased the recovery. This was attributed to a parallel effect to that of creep: namely, the creep acceleration that occurs at a higher moisture level than has previously been reached during the test.
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  • 10
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The status of de novo pyrimidine synthesis in the dp mutant of Drosophila melanogaster was examined by measuring the activity of the rate-limiting orotate phosphribosyl transferase (OPRT) enzyme. Activity is significantly elevated in late third instar larvae of 5 different dp mutant strains. A more detailed analysis of a dp ovc allele has shown that this elevation arises at about mid-larval life and persists until pupation. A low nucleotide diet causes a depression in OPRT activity in dp ovc larvae which can be reversed by dietary supplementation of uracil. However, neither the low nucleotide diet nor uracil supplementation results in a change in the expressivity of the dp mutant phenotypes. Changes in expressivity are produced by 6-azauracil and by elevated temperature although, in those cases, the effect on OPRT activity is minimal. The significance of the observations is discussed in relation to the role of pyrimidine biosynthesis in dp expressivity and chitin synthesis.
    Type of Medium: Electronic Resource
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