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  • 1
    Electronic Resource
    Electronic Resource
    Weeds and weed management in irrigated lentil in northern Sudan (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 37 (1997), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Weeds are a major constraint to increasing production of lentil (Lens culinaris Medik.) in Sudan, Field studies were conducted to determine the yield loss due to weeds, to identify the critical period of weed interference, to evaluate the activity of different herbicide mixtures in controlting weeds and their selectivity for lentil, and to evaluate different methods of weed control for developing an integrated weed management practice. At Rubatab. unrestricted weed growth accounted for up to 84% loss in yield. The critical period of weed control was between 2 and 4 weeks after sowing. However, a weeding regime experiment at Dongola, a cooler location with a longer growing season, indicated that the critical period was between 4 and 6 weeks after sowing. suggesting that the critical period might vary with the environmental conditions. The herbicides imazethapyr (0.05 kg a.i. ha-1), terbutryn (1.0 kg a.i. ha-1) and prometryn (1.0 kg a.i. ha-1), each in a tank mixture with pendimethalin (1.2 kg a.i. ha-1), were tolerated by lentil, controlled weeds effectively and significantly increased yields at Wad Hamid. Their efficacy in controlling weeds at Rubatab was low, however, because of the presence of Tephrosia apollinea (Del.) DC. and Melilotus indica (L.) All., which tolerated these herbicides. Efficacy was also reduced in heavier soils. One supplementary hand-weeding at 4 weeks after sowing enhanced the performance of these herbicides under such conditions. A tank mixture of oxyfluorfen (0.24 kg a.i. ha-1) with either terbutryn (1.0 kg a.i. ha-1) or prometryn (1.0 kg a.i. ha-1) also provided good weed control and increased yield of lentil at Wad Hamid. Application of a higher dose (1.5 kg a.i. ha-1) of terbutryn and prometryn caused phytotoxicity. Irrigation before seed-bed preparation reduced grass and broad-leaved weeds by 58% and 40% respectively, and gave a 30% increase in grain yield over no irrigation. Pre-emergence application of oxyfluorfen (0.24 kg a.i. ha-1) and a supplementary hand-weeding at 4 weeks after sowing gave excellent control of weeds and increased lentil yield by 57% over the weedy control. Thus, use of presowing irrigation, pre-emergence herbicide and one hand-weeding form an effective integrated package for controiling weeds in northern Sudan.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3180.1997.d01-35.x
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  • 2
    Electronic Resource
    Electronic Resource
    Strain distribution in the superplastic Pb-Sn eutectic alloy (1983)
    Springer
    Journal of materials science 18 (1983), S. 2407-2413 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Experiments were conducted to investigate the distribution of strain within the gauge length for specimens of the superplastic Pb-62 wt % Sn eutectic alloy tested at room temperature. It is shown that deformation is quasi-uniform at low strain rates in region II so that the necks are diffuse rather than localized, but failure occurs by the formation of a sharp neck at high strain rates in region III. Using a specimen grain size of 6.1 μm, the transition from region II to region III occurs at an initial strain rate in the vicinity of
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00541846
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  • 3
    Electronic Resource
    Electronic Resource
    Incidence of mites associated with stored seeds and food products in upper Egypt (1986)
    Springer
    Experimental and applied acarology 2 (1986), S. 19-24 
    Details
    ISSN: 1572-9702
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A survey on mites associated with stored seeds, flour and foodstuffs in Fayoum Governorate, Upper Egypt, proved the occurrence of about 24 species. Of these, 15 species in 8 families belong to Prostigmata, 6 species in 3 families belong to Astigmata and 3 species in 2 families belong to Mesostigmata. Members of the families Cheyletidae and Acaridae were the most common mites, found in many samples. Those of Caligonellidae, Ascidae and Raphignathidae were fairly common, but occurred in fewer types of samples. No mites were found in samples of lupine and camomile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01193352
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  • 4
    Electronic Resource
    Electronic Resource
    Neck formation and cavitation in the superplastic Zn-22% Al eutectoid (1979)
    Springer
    Journal of materials science 14 (1979), S. 2913-2918 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The mechanical behaviour of the superplastic Zn-22% Al eutectoid is divisible into three distinct regions. Experiments show the deformation is quasi-uniform at intermediate strain rates in region II, but neck formation is important at low strain rates in region I. Extensive cavitation occurs in regions I and II, but fracture in region I is due to necking. The results provide strong evidence for a decrease in the true value of the strain rate sensitivity in region I.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00611474
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  • 5
    Electronic Resource
    Electronic Resource
    The influence of prestrain on ductility in the superplastic Pb-Sn eutectic alloy (1983)
    Springer
    Journal of materials science 18 (1983), S. 3535-3542 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Experiments were conducted to investigate the effect of prestraining on the ductility of the superplastic Pb-62 wt % Sn eutectic alloy at room temperature. It is shown that prestraining at a fast strain rate in region III leads to a decrease in the elongation to failure on subsequent testing at a slower rate in region II. This decrease is due to the development of strain inhomogeneities during the prestrain. There is a further decrease in elongation if a holding time is inserted between the prestrain in region III and the subsequent testing in region II. It is shown also that prestraining at a slow strain rate leads to a sharp increase in the elongation to failure on subsequent testing at a fast strain rate. The reasons for these trends are discussed with reference to the occurrence of grain growth and the uniformity of strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540725
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  • 6
    Electronic Resource
    Electronic Resource
    Ductility of the superplastic Pb-Sn eutectic at room temperature (1983)
    Springer
    Journal of materials science 2 (1983), S. 59-62 
    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/BF00725431
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of grain size on ductility in the superplastic Pb-Sn eutectic (1983)
    Springer
    Journal of materials science 2 (1983), S. 337-340 
    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/BF00726322
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  • 8
    Electronic Resource
    Electronic Resource
    Observations onCheyletus cacahuamilpensis, a predator of the tenuipalpid miteDolichotetranychus floridanus (1982)
    Springer
    BioControl 27 (1982), S. 343-347 
    Details
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Quelques aspects de la biologie deCheyletus cacahuamilpensis Baker, acarien prédateur du ravageur des pelouses,Dolichotetranychus floridanus, (Banks) sont étudiés. A partir du stade larvaire les femelles non mûres deC. cacahuamilpensis présentent 2 stades nymphaux tandis que le mâle n'en a qu'un avant de devenir adulte. A 27°C le cycle évolutif et la vie imaginale durent en moyenne, respectivement, 30,1 et 34,4 j chez la femelle et 22,8 et 16,4 j chez le mâle. Au cours d'une période de ponte de 20,4 j, 28 œufs sont déposés. Les stades non mûrs et les femelles adultes consomment, respectivement, en moyenne 80,4 et 143,2 acariens. Le nombre deD. floridanus attaqués au cours de la vie du prédateur est en moyenne de 223,6 par femelle et 104,4 par mâle.
    Notes: Abstract Aspects of the biology ofCheyletus cacahuamilpensis Baker a predatory mite of the associated lawn grass pestDolichotetranychus floridanus (Banks) were studied. Apart from a larval stage immature females ofC. cacahuamilpensis pass through 2 nymphal stages, while the male has only 1 before reaching adulthood. At 27°C the life cycle and adult longevity respectively averaged 30.1 & 34.4 days for the female and 22.8 & 16.4 days for the male. In a 20.4 days oviposition period 28 eggs were laid. Immature and adult females devoured an average of 80.4 & 143.2D. floridanus, while those of the males consumed 40.8 & 63.6 individuals respectively. Thus the total number ofD. floridanus attacked during the predator's life span averaged 223.6 per female and 104.4. per male.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374818
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  • 9
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    Unknown
    Exceptional ductility in the superplastic Pb-62 Pct Sn eutectic (1977)
    Springer
    Details
    Publication Date: 1977-11-01
    Print ISSN: 1073-5623
    Electronic ISSN: 1543-1940
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 10
    facet.materialart.
    Unknown
    Factors influencing ductility in the superplastic Zn-22 Pct Al eutectoid (1977)
    Springer
    Details
    Publication Date: 1977-06-01
    Print ISSN: 1073-5623
    Electronic ISSN: 1543-1940
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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