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  • Springer  (231)
  • 1
    Electronic Resource
    Electronic Resource
    Experimental determination of exponential parameters for multiphonon residual absorption in a ZBLAN: Er3+ fibre (1994)
    Springer
    Optical and quantum electronics 26 (1994), S. S559 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Determination of exponential parameters for both Stokes and anti-Stokes sidebands by excitation of a ZBLAN: Er3+ fibre and bulk samples gives values of 9.4×10-3 cm and 14.1×10-3 cm, respectively. Observed values are larger than equivalent parameters usually found for nonradiative transitions. As examples, the measured parameters are used to determine the multiphonon sideband absorption between the 4I11/2 and the 4I13/2 electronic transitions of Er3+ and also between 1G4 and 3F4 of Pr3+. Available energy ranges for sideband pumping of distributed amplifiers are given as well as the minimum multiphonon background losses intrinsic to the rare-earth plus pure glass base combination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306224
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  • 2
    Electronic Resource
    Electronic Resource
    M-integral analysis for microcrack-damaged anisotropic composite materials (2000)
    Springer
    Archive of applied mechanics 70 (2000), S. 625-634 
    Details
    ISSN: 1432-0681
    Keywords: Key words Composite material, damage, M-integral, interaction, microcrack, potential energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  This paper presents an M-integral analysis for the microcracked anisotropic composite materials. By using an elementary solution derived for a single finite crack subjected to a concentrated force on crack faces, the problem of strong interacting, arbitrarily oriented and located microcracks in an anisotropic composite materials is reduced to a system of Fredholm integral equations. The crack-tip fracture parameters, such as the stress intensity factors, are evaluated from a numerical solution of the system of integral equations. Its dependence on the coordinate system, calculation, and physical interpretation of the M-integral are discussed in the interaction problem. Finally, a numerical example of the damage evaluation by the M-integral analysis is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190000100
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  • 3
    Electronic Resource
    Electronic Resource
    Further investigation of subinterface cracks (1997)
    Springer
    Archive of applied mechanics 67 (1997), S. 393-406 
    Details
    ISSN: 1432-0681
    Keywords: Key words Bimaterial interface ; crack ; singular integral equation ; integral.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Further investigation of subinterface cracks in bimaterial solids is presented. The traction method is proposed permitting easy calculation of the stress intensity factors of the cracks. The elastic T-terms of the cracks are determined. The J 1 and J 2 integrals are analyzed for a contour enclosing all the cracks in the global coordinate system x,y, where the x-axis is parallel to the interface. Numerical examples are given, and the results are presented for two kinds of material combinations, Cu/Al2O3 and Ni/MgO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050126
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  • 4
    Electronic Resource
    Electronic Resource
    A method for recognising feature interactions and feature components within the interactions (1997)
    Springer
    The international journal of advanced manufacturing technology 13 (1997), S. 713-722 
    Details
    ISSN: 1433-3015
    Keywords: Attributed adjacency graph ; Convex hull ; Feature interaction ; Feature recognition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Handling feature interaction is an outstanding issue in the feature recognition approach. This paper presents a method for recognising the presence of feature interactions and for determining the feature components within the interactions. First, two general feature types, namely depression and protrusion features, are identified from B-rep models based on a modified convex hull concept. Secondly, the identified features are represented by a modified AAG (Attributes Adjacency Graph) for facilitating their classification into low-level feature components, such as slots, pockets and bosses. Any unrecognisable features that remain after this second step are regarded as interacting features and they are finally recognised as low-level features via a process of virtual face building and volume adding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179071
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  • 5
    Electronic Resource
    Electronic Resource
    Tool-path planning for rough machining of a cavity by layer-shape analysis (1998)
    Springer
    The international journal of advanced manufacturing technology 14 (1998), S. 321-329 
    Details
    ISSN: 1433-3015
    Keywords: NC toolpath optimisation ; Reasoning system ; Rough machining ; Sculptured surface machining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In the manufacture of parts with sculptured cavities from prismatic stock, rough machining usually constitutes most of the machining time owing to the significant difference between the stock and the part shape. When using 2 1/2-D milling or a contour-map approach to do the rough machining, the appropriate selection of tool-path pattern for each cutting layer can significantly reduce rough machining time and hence increase productivity. In this paper, the commonly used toolpath patterns are summarised. A knowledge-based parametric approach for optimising the toolpath pattern of a given cutting layer is proposed. Then, a novel methodology is developed to calculate an arbitrary polygon area and locate the concave cavities in the polygon. Procedures for cutting-layer-shape analysis and the optimal comprehensive tool-path pattern generation are also built and proposed in this paper. These procedures can not only be applied to sculptured cavity parts with simple islands, but also to parts with arbitrarily-shaped islands. Finally, an example is given to illustrate the reasoning process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178910
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  • 6
    Electronic Resource
    Electronic Resource
    Implementation of a Robot System for Sculptured Surface Cutting. Part 1. Rough Machining (1999)
    Springer
    The international journal of advanced manufacturing technology 15 (1999), S. 624-629 
    Details
    ISSN: 1433-3015
    Keywords: Key words. NC machining; Rapid prototyping; Robotics; Solid modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Rapid prototyping plays an important role in product development. There are two ways to realise rapid rototyping: one is to develop new prototyping equipment such as stereolithography apparatus (SLA), selective laser sintering (SLS), etc., and the other is to improve existing CNC techniques. In this work, a robot system for rapid prototyping, which is an enhancement of the CNC based method, is presented. A robot arm holding a milling tool is used to machine the prototype of a solid model drawn using a commercial CAD system. In this paper, Part 1, a strategy using the robot for rough machining is discussed and then an automatic tool-path generation method using a grid height array is presented. This method can generate tool paths for rough machining with different tolerances. As a verification of the proposed algorithm, a number of prototypes have been produced, which have demonstrated the feasibility and advantages of the algorithm. In a companion paper, Part 2, an approach to represent C-space by incorporating possible variations in tooling orientations is proposed. In order to reduce error on complex surfaces resulting from undercut or overcut operations, a curvature-matching algorithm is developed. Finally, experimental work using the collision-free planning strategy and simulation for the curvature matching algorithm is carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001700050111
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  • 7
    Electronic Resource
    Electronic Resource
    Real-time feedback scheduling of flexible manufacturing systems (1992)
    Springer
    Journal of intelligent and robotic systems 6 (1992), S. 51-63 
    Details
    ISSN: 1573-0409
    Keywords: Scheduling ; flexible manufacturing systems ; stability ; feedback
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A genetic manufacturing environment is considered. The emphasis is on small-lot, discrete, and asynchronous type of manufacturing systems rather than high volume and continuous type. Two classes of scheduling policies are proposed to render the machine stable. The policies are of feedback type. The decision is made in real-time and on-line.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314697
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  • 8
    Electronic Resource
    Electronic Resource
    Potato slab dehydration by air ions from corona discharge (1991)
    Springer
    International journal of biometeorology 35 (1991), S. 67-70 
    Details
    ISSN: 1432-1254
    Keywords: Air ions ; Corona current ; Radiogauge ; Potato drying
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Space charge (air ions) produced by single corona electrodes was used to enhance drying rates from fresh slabs of potato. The drying path was traced by a beta-ray gauge which provided both sensitivity and reproducibility to the measurements of drying time. The rate of evaporation was increased 2.2 to 3.0 times when subjected to fluxes of 3.02×1012 positive ions alone or in combination with 7.31×1012 negative air ions/cm2 per s compared to that from an air-drying control slab. Electric wind caused by an ionic drag force seems to be the principal driving force for the observed enhancement in drying rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01087479
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  • 9
    Electronic Resource
    Electronic Resource
    Natural convection in an inclined enclosure with a fluid layer and a heat-generating porous bed (1997)
    Springer
    Heat and mass transfer 33 (1997), S. 247-255 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Multiple steady-state solutions of natural convection in an inclined enclosure with a fluid layer and a heat-generating porous bed is investigated numerically by the finite volume method. The conservation equations for the porous layer are based on a general flow model which includes both the effects of flow inertia and friction. The flow in fluid layer is modeled by Navier–Stokes equations. The method of pseudo arc-length continuation is adapted in studying the effects of tilt angle on flow pattern and heat transfer. It is found that, in the whole domain of tilt angle, there exist two groups of solutions with quite different flow pattern and heat transfer behavior. The effects of aspect ratio on flow pattern and heat transfer have also been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050185
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  • 10
    Electronic Resource
    Electronic Resource
    Fast multipole method as an efficient solver for 2D elastic wave surface integral equations (1997)
    Springer
    Computational mechanics 20 (1997), S. 495-506 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The fast multipole method (FMM) is very efficient in solving integral equations. This paper applies the method to solve large solid-solid boundary integral equations for elastic waves in two dimensions. The scattering problem is first formulated with the boundary element method. FMM is then introduced to expedite the solution process. By using the FMM technique, the number of floating-point operations of the matrix-vector multiplication in a standard conjugate gradient algorithm is reduced from O(N 2) to O(N 1.5), where N is the number of unknowns. The matrix-filling time and the memory requirement are also of the order N 1.5. The computational complexity of the algorithm is further reduced to O(N 4/3) by using a ray propagation technique. Numerical results are given to show the accuracy and efficiency of FMM compared to the boundary element method with dense matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050270
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