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  • 1
    Electronic Resource
    Electronic Resource
    Affected Characteristics Analysis of the Pulsed Laser Forming of Metal Sheet (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 333-337 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Laser forming of metal sheet is a forming technology of sheet without a die that the sheetis deformed by internal thermal stress induced by partially irradiation of a laser beam. In this paper,the bending behavior of common stainless steel 1Cr18Ni9 sheet is studied after being irradiated bystraight line with a Nd:YAG pulsed laser beam. The aim of the investigation is to find out therelationship of the physical behaviors of heat affected zone (HAZ) with the pulse parameters of thelaser. Through the analysis of the fundamental theory of pulsed laser affected, this paper shows theaffected characteristics of metal sheet with pulsed laser forming. The results show that themicrostructure of HAZ of pulsed laser scanned is layered, and the micro-hardness is improved thanthat in matrix. The microstructures show that the deformed grain structure is inhomogeneous, thatcaused the grain sizes and grain orientations in HAZ to become different. By qualitative analysis ofexperimental result, the conclusion obtained may provide basis for theoretical investigation andpossible industrial application of laser forming process in the future
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.333.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental Investigation on 3D Laser Forming of Metal Sheet (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 471-472 (Dec. 2004), p. 568-572 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this article, the relations between the formed shapes and process parameters had been studied for 3D laser forming of sheet metals. The investigation was performed on Stainless 1Cr18Ni9Ti sheet using a Nd:YAG laser source. The scanning strategies were being investigated to potentially achieve a more uniform temporal and spatial distribution of the laser energy, possibly leading to reduced part distortion, by scanning the beam across the sheet surface with both continuous and segmented irradiation geometries. The experimental results revealed that the crossspider scanning strategy could form square and circle sheets into spherical domes. And the radial lines scanning strategy could form rectangle sheets into saddle shapes. It was also apparent from the experimental results that the height of the center of the formed sheet increased with the increasing of the laser power and scanning numbers. The height of the formed square sheet firstly decreased with the laser scanning velocity increasing and began to decrease at a certain processing parameters by cross spider strategy, in which the circle sheet was opposite with the square sheet, and in which the rectangle sheet decreased with speed increasing
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.471-472.568.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Mathematical Model for Compressive Stress-Strain Curve of Recycled Aggregate Concrete (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 521-524 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: For the effective utilization of recycled aggregate concrete (RAC), it is necessary tocorrectly describe its compressive stress-strain curve (SSC) in theoretical and numerical analysis aswell as engineering design of RAC structures. The objective of this study is to establish a goodmathematical model for SSC of RAC. Based on energy dissipation theory, the differential governingequation of SSC is deduced and a new mathematical model is obtained. The new model can welldescribe both hardening type SSC and softening type SSC. It can overcome the shortcoming of thetraditional model. Finally, good agreements have been found between the new model and theexperimental investigations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.521.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Damage Evaluation Based on Electrical Resistance Measurement (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 589-592 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The formulae between electrical resistance change and damage in metals were studied onthe basis of different damage mechanisms. This DC electrical resistance is a more sensitive parameterto the initiation of microcracks during the irreversible damage accumulation process. Measurement oflow electrical resistance due to accumulative damage is discussed. Agreement between evaluations ofductile damage via electrical resistance change and elasticity modulus measurement is good
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.589.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Investigation on the Mechanisms of Flexible Sheet Metal Forming Using Plasma Arc (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 93-96 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: An investigation on the mechanism of flexible sheet metal forming using plasma arc havebeen performed in this paper. The experimental results show that temperature gradient mechanism(TGM) is caused by a steep temperature gradient across the sheet metal thickness, which willgenerates bending towards the plasma arc, while buckling mechanism (BM) usually causes sheetmetals to bend away from the plasma arc on the condition that the plasma arc diameter is largecompared to the sheet metal thickness and the scanning speed is low. The strain-hardening effectsand phase transformation effects were also conducted in the investigation, which can be of greatsignificance for the micro hardness and deformation of sheet metal in the heated area. Theinvestigation reveals the mechanisms of sheet metal forming using plasma arc, and providestheoretical foundation for its industry application
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.93.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    General Subdivision Inferred from Catmull-Clark Subdivision Algorithm (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 789-792 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Subdivision algorithms have emerged recently as a powerful and useful technique inmodeling free-form surfaces. Subdivision algorithms exited at present however, being theirdisadvantages, can’t meet the demand of wide application in modeling surfaces and don’t stillbelong to a general theory. In this paper, a general subdivision algorithm is presented which is ageneral conclusion inferred from classical Catmull-Clark subdivision algorithm and can produceexisting subdivision algorithm by selecting reasonable vertical weights and horizontal weights. Thesubdivision algorithm is an ideal resolution for keeping shape feature such as crease, corner and dartcontrast to all existing subdivision algorithms, it also have the advantage of flexible weightsselection, easily control of shape and high compute speed. Therefore, the algorithms are extensivelyapplicable for shape modeling in computer aided geometric design, industrial prototype design andreverse engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.789.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Explicit Analysis on Temperature Field of 3D Laser Forming of Square Metal Sheet to Spherical Dome (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 390-395 
    Details
    ISSN: 1662-7482
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Laser forming is a technique of using the energy from a laser beam to modify and adjustthe curvature of sheet metals or hard materials. 2-dimention (2D) laser forming can reasonablyaccurately control bend angles with various materials. To advance this process further for realisticforming applications in a manufacturing industry, it is necessary to consider larger scale controlled3-dimention (3D) laser forming. On the base of mechanism of 2D laser forming, the deformationmainly depends on the temperature gradient between upper and bottom surface of sheet metal. Thework presented in this paper shows that the temperature field of using the spider scanning path totransform the thin square sheet to spherical dome by 3D laser forming. The explicit thermal analysison 3D laser forming is shown in the article. This paper discusses the interaction between movinglaser beam and sheet, the varied temperature field on the sheet during laser scanning. In order togive the verification on the results of simulation, the correlative experiment has progressed and theresults of experiments are in accord with the simulation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/38/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.10-12.390.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Somatic embryogenesis and plant regeneration in cultured immature inflorescences of Setaria italica (1984)
    Springer
    Plant cell reports 3 (1984), S. 149-150 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Young inflorescence explants of Setaria italica in culture showed high capacity for regenerating plantlets through somatic embryogenesis. Embryogenic callus formation was initiated from the explants cultured on Murashige and Skoog's medium with 2 mg/l 2,4-D and 0.2–0.5 mg/l KT or BAP, but it was better for the maintenance of embryogenic growth to subculture the calli on the medium with 2,4-D and KT/BAP and on the medium with 2 mg/l 2iPA and 0.2 mg/l NAA alternately. A number of plantlets were regenerated when embryogenic calli were transferred onto the same basic medium but with 2 mg/l BAP and 0.5 mg/l NAA. Plant regeneration capacity has been maintained in some embryogenic calli during fourteen months of subculture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270210
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  • 9
    Electronic Resource
    Electronic Resource
    Specificity and regulation of the dicarboxylate carrier on the peribacteroid membrane of soybean nodules (1990)
    Springer
    Planta 182 (1990), S. 437-444 
    Details
    ISSN: 1432-2048
    Keywords: Bradyrhizobium ; Dicarboxylate transport ; Glycine ; Nitrogen fixation ; Peribacteroid membrane ; Zhizobium ; Root nodule ; Symbiosis (soybean-Bradyrhizobium)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Malate and succinate were taken up rapidly by isolated, intact peribacteroid units (PBUs) from soybean (Glycine max (L.) Merr.) root nodules and inhibited each other in a competitive manner. Malonate uptake was slower and was severely inhibited by equimolar malate in the reaction medium. The apparent Km for malonate uptake was higher than that for malate and succinate uptake. Malate uptake by PBUs was inhibited by (in diminishing order of severity) oxaloacetate, fumarate, succinate, phthalonate and oxoglutarate. Malonate and butylmalonate inhibited only slightly and pyruvate,isocitrate and glutamate not at all. Of these compounds, only oxaloacetate, fumarate and succinate inhibited malate uptake by free bacteroids. Malate uptake by PBUs was inhibited severely by the uncoupler carbonylcyanidem-chlorophenyl hydrazone and the respiratory poison KCN, and was stimulated by ATP. We conclude that the peribacteroid membrane contains a dicarboxylate transport system which is distinct from that on the bacteroid membrane and other plant membranes. This system can catalyse the rapid uptake of a range of dicarboxylates into PBUs, with malate and succinate preferred substrates, and is likely to play an important role in symbiotic nitrogen fixation. Energization of both the bacteroid and peribacteroid membranes controls the rate of dicarboxylate transport into peribacteroid units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02411397
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  • 10
    Electronic Resource
    Electronic Resource
    Inherited chilling tolerance in somatic hybrids of transgenic Hibiscus rosa-sinensis× transgenic Lavatera thuringiaca selected by double-antibiotic resistance (1996)
    Springer
    Plant cell reports 15 (1996), S. 506-511 
    Details
    ISSN: 1432-203X
    Keywords: Key Words: Acid phosphatase – Freezing tolerance – Nuclear DNA content – Protoplast fusion –Agrobacterium-mediated transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary. Improvement of Hibiscus rosa-sinensis for increased frost tolerance has been attempted through somatic hybridization with the frost tolerant Lavatera thuringiaca. Cell suspensions from Hibiscus and Lavatera were transformed with A. tumefaciens harboring plasmids containing selectable genes coding for kanamycin and hygromycin resistance, respectively. We provided evidence that H. rosa-sinensis and L. thuringiaca were transformed by strong selection of transformed calluses in medium containing antibiotics, by GUS activity determination in protein extracts and by molecular confirmation of chromosomal integration and expression of the selectable genes. Protoplasts isolated from a kanamycin-resistant Hibiscus callus and from a hygromycin-resistant Lavatera callus were fused and selected in medium containing both antibiotics. We determined unambiguously that the regenerated double-antibiotic resistant clones obtained are indeed somatic hybrids through analysis of acid phosphatase zymograms and nuclear DNA content. Plant regernation through somatic embryogenesis was accomplished from both isolated protoplasts and transgenic calluses of L. thuringiaca. However, regeneration from the double-antibiotic resistant fusant calluses was unsuccessful. Analysis of the somatic hybrids at the callus level showed that chilling and freezing tolerance are governed by independent genetic components. The somatic hybrids displayed significant improvement for chilling tolerance at conditions lethal to H. rosa-sinensis, although frost tolerance was not expressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050063
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