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  • 1
    Electronic Resource
    Electronic Resource
    Relationship between development of endosperm transfer cells and grain mass in maize (1998)
    Springer
    Biologia plantarum 41 (1998), S. 539-546 
    Details
    ISSN: 1573-8264
    Keywords: cytoplasm ; endoplasmatic reticulum ; ingrowth ; mitochondria ; nuclei ; vesicles ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The most basal endosperm cells of maize (Zea mays L.) began differentiating into transfer cells in 10 days after pollination (DAP). The thickening and ingrowths forming in the transfer cell wall were slow during 10 and 15 DAP. There were many vesicles, silky and string ball objects in cytoplasm, and the number of mitochondria and rough endoplasm reticulum increased. After 15 DAP, the wall thickening and ingrowths forming in the transfer cells sped up. By 20 DAP, the transfer cell zone had developed, there appeared 65 - 70 rows of cells in width and 3 - 4 layers of cell in depth, the obvious cell wall ingrowths presented strong positive reaction with periodic acid Schiff's reagent. After 20 DAP, no significant change appeared in the shape and structure of the transfer cells, and the transfer cells entered function stage. In the mature kernels (53 DAP), the most basal transfer cells were filled with ingrowths, however, dense cytoplasm was also found in these cells. The nuclei had quite irregular shapes in these cells. Some transfer cells contained black grains and crystals. A black layer formed in the pericarp tissue adjacent to the transfer cell zone. Full development of endosperm transfer cells was important for reduction of kernel abortion and increase of kernel mass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001840316163
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  • 2
    Electronic Resource
    Electronic Resource
    The electrochemical behavior of colloidal polypyrrole (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 953-957 
    Details
    ISSN: 1435-1536
    Keywords: Key words Polypyrrole ; colloid ; electrochemistry ; charge transport ; modified electrode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The electrochemical behavior and charge transport of colloidal polypyrrole particles (without stabilizer) modified electrode have been investigated. The voltam-metric results show that the electro-chemical behavior of colloidal polypyrrole is different from that of polypyrrole synthesized electro-chemically. The strong adsorption of the colloidal particles on substrate makes it easy to form a polypyrrole modified electrode. The charge transport of polypyrrole is controlled by the diffusion of counterions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050171
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  • 3
    Electronic Resource
    Electronic Resource
    UVA Light-Induced DNA Cleavage by Selected Polycyclic Aromatic Hydrocarbons (2000)
    Springer
    Bulletin of environmental contamination and toxicology 64 (2000), S. 467-474 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001280000027
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  • 4
    Electronic Resource
    Electronic Resource
    Hybrid Learning for Tool Wear Monitoring (2000)
    Springer
    The international journal of advanced manufacturing technology 16 (2000), S. 303-307 
    Details
    ISSN: 1433-3015
    Keywords: Keywords: Fuzzy neural network; Vibration; Wear
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In automated manufacturing systems such as flexible manufacturing systems (FMSs), one of the most important issues is the detection of tool wear during the cutting process. This paper presents a hybrid learning method to map the relationship between the features of cutting vibration and the tool wear condition. The experimental results show that it can be used effectively to monitor the tool wear in drilling. First, a neural network model with fuzzy logic (FNN), responding to learning algorithms, is presented. It has many advantageous features, compared to a backpropagation neural network, such as less computation. Secondly, the experimental results show that the frequency distribution of vibration changes as the tool wears, so the r.m.s. of the different frequency bands measured indicates the tool wear condition. Finally, FNN is used to describe the relationship between the characteristics of vibration and the tool wear condition. The experimental results demonstrate the feasibility of using vibration signals to monitor the drill wear condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001700050161
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  • 5
    Electronic Resource
    Electronic Resource
    Adsorption active sites -Key factor on the adsorption ability of pyridine molecules on Ag surfaces (1988)
    Springer
    Applied physics 47 (1988), S. 283-286 
    Details
    ISSN: 1432-0649
    Keywords: 68.45.Da
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental results on the study of pyridine molecules adsorbed on Ag films and Ag foils under atmospheric and ultra-high vacuum environments by the secondharmonic generation technique suggest that micro-scaled active sites existing in the evaporated Ag film play the key role for this kind of adsorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716086
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  • 6
    Electronic Resource
    Electronic Resource
    The role of cluster in surface-enhanced raman scattering (SERS) (1989)
    Springer
    Applied physics 49 (1989), S. 553-556 
    Details
    ISSN: 1432-0649
    Keywords: 68.45.Ax
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental study on differently prepared rough silver surfaces reveal the existence of stable clusters formed by the silver atoms. The clusters with certain adsorbed molecules serve as “Raman active sites”, which play an important role in SERS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324956
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  • 7
    Electronic Resource
    Electronic Resource
    BIDES: A BIST design expert system (1991)
    Springer
    Journal of electronic testing 2 (1991), S. 165-179 
    Details
    ISSN: 1573-0727
    Keywords: Built-in self-test ; design for testability ; knowledge-based expert system ; pseudorandom testing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract BIDES is an expert system for incorporating BIST into a hardware design that is described in VHDL. Based on the BILBO technique, the BIDES system allocates pseudorandom pattern generators and signature analysis registers to each combinational logic module in a design in such a way that given constraints on testing time and hardware overhead are satisfied. This assignment is performed using the iterative process of regeneration and evaluation of various BIST implementations. In order to effectively perform regeneration, an abstraction hierarchy for a BIST design is introduced and a hierarchical planning technique is employed using this structure. This formulation also leads to an easily modifiable system. Prolog is used for implementing the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00133501
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  • 8
    Electronic Resource
    Electronic Resource
    A novel approach for compensation of birefringence in cylindrical Nd: YAG rods (1996)
    Springer
    Optical and quantum electronics 28 (1996), S. 57-69 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A new concept for compensation of birefringence in solid-state rod lasers is presented. The basic idea of our approach is the simultaneous use of an in-cavity polarization rotator and an imaging optical system between the two passes through the laser rod. The theoretical analysis based on matrix optics shows that perfect compensation for the birefringence and bifocusing in laser rods is possible for a large pumping range. Experimental results with two Nd:YAG rods are also presented. The measured depolarization loss per transit for a test beam at 0.63 μm is less than 5% for pumping power up to 6kW per rod. This would allow efficient generation of high-power TEM00 mode and linearly polarized multimode output power from Nd:YAG oscillators in rod geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00578551
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  • 9
    Electronic Resource
    Electronic Resource
    On the design of random pattern testable PLA based on weighted random pattern testing (1992)
    Springer
    Journal of electronic testing 3 (1992), S. 149-157 
    Details
    ISSN: 1573-0727
    Keywords: built-in self-test ; PLA ; random pattern testability ; testable design
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Programmable Logic Arrays (PLAs) provide a cost effective method to realize combinational logic circuits. PLAs are often not suitable for random pattern testing due to high fao-in of gates. In order to reduce the effective fan-in of gates, previous random pattern testable (RPT) PLA designs focused on partitioning inputs and product lines. In this paper we propose a new random pattern testable design of PLAs which is suitable for built-in selftest. The key idea of the proposed design is to apply weighted random patterns to the PLA under test. The proposed design method was applied to 30 example PLAs. The performance of the RPT PLAs was measured in the size of test set, area overhead, and time overhead, and compared with two other designs in test length and fault coverage. The experimental results show that the proposed design achieve short test length and high fault coverage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00137252
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  • 10
    Electronic Resource
    Electronic Resource
    Suggestions regarding thermal diffusivity measurements on pyrolytic graphite and pyrolytic boron nitride by the laser pulse method (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 789-802 
    Details
    ISSN: 1572-9567
    Keywords: anisotropic materials ; pyrolytic graphite ; pyrolytic boron nitride ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The laser pulse method can be successfully applied to the measurement of thermal diffusivity of isotropic materials subject to some assumptions. For anisotropic materials, this method is applicable to the measurement of principal thermal diffusivity only on the condition that there is no difference in direction between the principal axis and that of the temperature gradient. After analyzing the heat conduction process in an anisotropic solid, it has been shown that large errors in the measurement of thermal diffusivity would exist if the direction of the principal axis deviates inconspicuously from that of the temperature gradient. The experimental results of thermal diffusivity of highly oriented pyrolytic graphite (HOPG) samples with various deviation angles have been compared with the analytical results. The laser pulse method is not applicable to measurements on semitransparent pyrolytic boron nitride (PBN). We adopted a two-layer composite sample to measure the thermal diffusivity of PBN in the c direction and a particular graphite-PBN composite sample has been prepared which has a very low thermal resistance at the interface. The thermal diffusivity and thermal conductivity of PG (below 2300°C) and PBN (below 1000°C) are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503836
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