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  • Biparental inheritance  (2)
  • automobile  (2)
  • 1
    Electronic Resource
    Electronic Resource
    A fault identification and classification scheme for an automobile door assembly process (1994)
    Springer
    International journal of flexible manufacturing systems 6 (1994), S. 261-285 
    Details
    ISSN: 1572-9370
    Keywords: automobile ; assembly ; fault classification ; principal components
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A process fault identification and classification scheme for an automobile door assembly process is presented based on multivariate in-line dimensional measurements and principal component factor analysis. First, the door assembly process and the dimensional measurement system are briefly introduced. Second, the technique of principal component factor analysis is presented for process fault identification. Process faults are summarized based on off-line identified case studies. Finally a machine classification scheme based on principal components and principal factors is presented and evaluated, using the pattern knowledge obtained off-line. This scheme is shown to be effective in classifying process faults using production data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01324797
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optimal door fitting with systematic fixture adjustment (1994)
    Springer
    International journal of flexible manufacturing systems 6 (1994), S. 99-121 
    Details
    ISSN: 1572-9370
    Keywords: automobile ; assembly ; part fixturing ; optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A systematic approach is presented to obtain the best door gap quality through optimal door fitting in automobile body manufacturing. First, three indexes of gap quality are defined; they are: (1) door gap width deviation relative to design nominal; (2) door gap parallelism; and (3) car-to-car gap consistency. Then the door-fitting problem is formulated into a general constrained optimization problem. The effects of optimal door fitting on the three quality indexes are evaluated through computer simulation. These results provide a lower bound on the design of nominal door gap by considering process capability. Finally, a computer-aided fixture adjustment scheme is developed to orient a door in a body side opening to achieve the optimal fitting. The amount of adjustment, with the desired orientation obtained from optimization, is calculated based on parametrically modeled local surface features of the fixture and the door. The adequacy of door feature modeling is verified through a door-fitting experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01328807
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cytoplasmic DNA apportionment and plastid differentiation during male gametophyte development in Pelargonium zonale (1994)
    Springer
    Sexual plant reproduction 7 (1994), S. 51-56 
    Details
    ISSN: 1432-2145
    Keywords: Cytoplasmic DNA apportionment ; Biparental inheritance ; Plastid differentiation ; Male gametophyte ; Pelargonium zonale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the male gametophyte of Pelargonium zonale, generative and sperm cells contain cytoplasmic DNA in high density compared to vegetative cells. Cytoplasmic DNA was examined using the DNA fluorochrome DAPI (4'6-diamidino-2-phenylindole) and observed with epifluorescence and electron microscopy. The microspore cell contains a prominent central vacuole before mitosis; mitochondria and plastids are randomly distributed throughout the cytoplasm. Following the first pollen grain mitosis, neither the vegetative cell nor the early generative cell display a distributional difference in cytoplasmic DNA, nor is there in organelle content at this stage. During the maturation of the male gametophyte, however, a significant discrepancy in plastid abundance develops. Plastids in the generative cell return to proplastids and do not contain large starch grains, while those in the vegetative cell develop starch grains and differentiate into large amyloplasts. Plastid nucleoids in generative and sperm cells in a mature male gametophyte are easily discriminated after DAPI staining due to their compactness, while those in vegetative cells stained only weakly. The utility of the hydrophilic, non-autofluorescent resin Technovit 7100 in observing DAPI fluorescence is also demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241887
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cytological evidence of biparental inheritance of plastids and mitochondria inPelargonium (1995)
    Springer
    Protoplasma 186 (1995), S. 201-207 
    Details
    ISSN: 1615-6102
    Keywords: Biparental inheritance ; Plastid transmission ; Mitochondrion transmission ; Fertilization ; Pelargonium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Based on the organelle differences between egg and sperm cells inPelargonium hortorum, the zygote, proembryo, and endosperm were examined under the transmission electron microscope. Plastids and mitochondria in the egg cell are significantly different from those of the sperm cell. Egg plastids are starch-containing and less electron dense. They appear circular, elliptical irregular elongate in sections. Sperm cell plastids are relatively electrondense, mostly cup-shaped or dumbbell and devoid of starch granules. Mitochondria of the egg cell are giant and mostly cup-shaped while sperm mitochondria are smaller and usually circular in section. Double fertilization is completed by 24 h after pollination and the pollen tube can be seen in the degenerated synergid. In the zygote, plastids and mitochondria from male and female gametes can be distinguished by their characteristic differences. Moreover, paternal and maternal organelles appear to be distributed at random in the zygote. Aside from the pollen tube and its released starch granules, there is no enucleated cytoplasmic body in the degenerated synergid. Two days after pollination, the zygote undergoes one transverse division to form a 2-celled proembryo which consists of one larger vacuolated basal cell and one smaller densely cytoplasmic apical cell. Paternal and maternal organelles can be detected in both cells of the proembryo and also in the endosperm at this stage. From these results, it can be concluded that plastids and mitochondria from both male and female gametes have been transmitted into the apical cell of the proembryo and most probably to the following generation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281330
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    Paper (German National Licenses)
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