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  • Articles  (17)
  • Articles: DFG German National Licenses  (17)
  • Open Access-Papers
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (11)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (6)
  • 1
    Electronic Resource
    Electronic Resource
    An improved formulation of the oxygen-diffusion problem and its application to Zircaloy oxidation by steam (1997)
    Springer
    Oxidation of metals 47 (1997), S. 427-444 
    Details
    ISSN: 1573-4889
    Keywords: modeling ; numerical techniques ; finite-difference methods ; diffusion ; moving boundary problem ; steam oxidation ; Zircaloy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Numerical solutions of the oxygen-diffusion problem arising in the oxidation of metals at high temperatures are complicated by the change in density as the oxide is formed and the occurrence of moving boundaries separating the different phases. The former complication is resolved by a transformation of the dependent variable and the coordinate, which reduces the problem to a form identical to one without density change. The latter complication is dealt with by demonstrating an analogy with the Stefan problem in heat transfer with phase change in the enthalpy formulation, for which abundant numerical works exist. A finite-difference code is written to solve the resulting equations. It is successfully applied to simulate an oxidation experiment of Zircaloy by steam at 1600°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02134785
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  • 2
    Electronic Resource
    Electronic Resource
    A geminivirus causing vein yellowing of Ageratum conyzoides in Singapore (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 42 (1993), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A vein-yellowing disease of Ageratum conyzoides in Singapore was shown to be caused by a geminivirus, here named ageratum yellow vein virus (AYVV), which was transmitted by the whitefly Bemisia tabaci but not by inoculation with sap or through seed. AYVV particles (30 × 20 nm) are serologically related to those of other whitefly-transmitted geminiviruses, and reacted with some monoclonal antibodies elicited by particles of African cassava mosaic or Indian cassava mosaic geminiviruses. However, the epitope profile of AYVV differed from the profiles of these viruses, and from those of geminiviruses from vein yellowing-affected A. conyzoides from India and from yellow leaf curl-affected tomato from either Singapore or India. The results provide further evidence of antigenic differences among geminiviruses that cause similar diseases in the same plant species in different geographical regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1993.tb01481.x
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  • 3
    Electronic Resource
    Electronic Resource
    Sensory Evaluation of Regina Freestone Peaches Treated with Low Doses of Gamma Radiation (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 50 (1985), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: regina freestone peaches from california were given low postharvest doses of gamma radiation (65-75 krads) and were compared with non-irradiated controls approximately one month after harvest. Practiced judges were used, with a technique of minimal cross-sensory interference, as an analytical tool to guide subsequent instrumental analysis. Strong differences were found in odor and components of taste not associated with sweetness. Lesser trends were noted for firmness and appearance. Untrained subjects also detected gross sensory differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1985.tb13010.x
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  • 4
    Electronic Resource
    Electronic Resource
    Initial Sensory Evaluation of Bing Cherries Treated with Low Doses of Gamma-Radiation (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 50 (1985), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Bing cherries from California were given low postharvest doses of gamma radiation (60-80 Krads) and were compared with nonirradiated controls during a period 3-11 days after harvest. Irradiated cherries showed a greater degree of shrivelling, a trend to be softer on chewing and also exhibited flavor differences. Trends for consistent differences in firmness tested manually, darkness of skin color and degree of brown blemishing were not noted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1985.tb13009.x
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  • 5
    Electronic Resource
    Electronic Resource
    Sensory Evaluation of Navel Oranges Treated with Low Doses of Gamma-Radiation (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 50 (1985), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Navel oranges from two locations in California were given low postharvest doses of gamma radiation (60 - 80 Krads) and compared with nonirradiated controls for taste, flavor, odor, firmness, degree of orange color, degree of brown blemishing, ease of peeling and intactness of the membranes on sectioning. Practiced judges were used as an analytical screening tool using minimal cross-sensory interference, while untrained subjects were used to determine whether changes might be distinguished by‘nonexperts’. Greatest differences were found for degree of blemishing, lesser differences for flavor by mouth and odor and some trends for taste, color, texture and ease of peeling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1985.tb13762.x
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  • 6
    Electronic Resource
    Electronic Resource
    Fatigue crack growth rates under sequential mixed-mode I and II loading cycles (2000)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 23 (2000), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: One common mode of failure that occurs in rolling bodies such as gears, bearings and rails is due to the fatigue process. Several research workers suggest that rolling contact fatigue cracks are subjected to mixed mode I and II loading cycles. It is believed that the correct modelling of loading cycles can help us to study the mechanics of crack growth because fatigue comprises a major safety consideration in the design process. Experiments have been performed under nonproportional mixed-mode I and II loading cycles with fixed degrees of overlap, so that coplanar cracks were produced. Three empirical crack propagation laws have been established which are related to both mode I and mode II effective stress intensity factor ranges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.2000.00342.x
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  • 7
    Electronic Resource
    Electronic Resource
    Two measurement techniques for determining effective stress intensity factors (2000)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 23 (2000), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two methods were studied for determining crack closure and locking effects under combinations of mixed mode I and II loading, namely the strain gauge and the surface replica methods. They demonstrated that strain gauges are able to detect the mode I crack closure but not mode II crack locking. As an alternative, the surface replica method is suggested as a practical technique for measuring mode II crack locking effects. The effective mode II stress intensity factor range can be estimated by comparison of the actual measured sliding range between a pair of crack faces and the theoretical sliding range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.2000.00341.x
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  • 8
    Electronic Resource
    Electronic Resource
    A comparative study of the parasite fauna of wild and cultured grouper (Epinephelus malabaricus Bloch et Schneider) in Malaysia
    Amsterdam : Elsevier
    Aquaculture 68 (1988), S. 203-207 
    Details
    ISSN: 0044-8486
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0044-8486(88)90353-5
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  • 9
    Electronic Resource
    Electronic Resource
    A graph-based expert system approach to geometric feature recognition (1995)
    Springer
    Journal of intelligent manufacturing 6 (1995), S. 155-162 
    Details
    ISSN: 1572-8145
    Keywords: Feature recognition ; adjacency graphs ; expert systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Geometric feature recognition is a crucial task in the development of concurrent engineering software. This paper presents a new methodology for geometric feature recognition which combines the advantages of face-edge adjacency graphs and expert systems. The methodology uses several new concepts such as enhanced winged edge data structure (EWEDS) and multi-attributed adjacency graphs (MAAG). The object model is presented as a set of facts. The rules for the recognition of each feature are derived from the corresponding feature-MAAG. This simplifies the process of writing the rules while enabling the inclusion of new features into the rule base as they are encountered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171444
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  • 10
    Electronic Resource
    Electronic Resource
    Deep-level photoluminescence studies of undoped and tin-doped (LEC) InP (1994)
    Springer
    Journal of materials science 5 (1994), S. 215-220 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effects of tin doping on the deep-level photoluminescence (PL) spectra of (LEC) InP were studied. Specifically, the effect of rapid thermal annealing (RTA) on the deep emission bands labelled as band A (1.13 eV), band B (1.06 eV), band C (1.20 eV) and band D (0.97 eV) were investigated. Band A appeared in both undoped and doped samples, but it disappeared after RTA for all the samples. It is suggested that band A is due to the formation of a complex involving VIn with residual impurities. The disappearance of band A after RTA is concomitant with the appearance of bands B, C and D. The existence of band B is attributed to the complex formation of VP with residual impurities. Band C was observed after the annealing process both in undoped and lightly-tin-doped samples and is believed to be due to the formation of VP single point defects. Band D was only observed in heavily doped samples and it is believed to be the effect of InP antisite defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186188
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