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  • 1
    Electronic Resource
    Electronic Resource
    A polynomial solution for the potato-peeling problem (1986)
    Springer
    Discrete & computational geometry 1 (1986), S. 155-182 
    Details
    ISSN: 1432-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The potato-peeling problem asks for the largest convex polygon contained inside a given simple polygon. We give anO(n 7) time algorithm to this problem, answering a question of Goodman. We also give anO(n 6) time algorithm if the desired polygon is maximized with respect to perimeter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02187692
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  • 2
    Electronic Resource
    Electronic Resource
    Computing the link center of a simple polygon (1988)
    Springer
    Discrete & computational geometry 3 (1988), S. 281-293 
    Details
    ISSN: 1432-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The link center of a simple polygonP is the set of pointsx insideP at which the maximal link-distance fromx to any other point inP is minimized. Here the link distance between two pointsx, y insideP is defined to be the smallest number of straight edges in a polygonal path insideP connectingx toy. We prove several geometric properties of the link center and present an algorithm that calculates this set in timeO(n 2), wheren is the number of sides ofP. We also give anO(n logn) algorithm for finding an approximate link center, that is, a pointx such that the maximal link distance fromx to any point inP is at most one more than the value attained from the true link center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02187913
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  • 3
    Electronic Resource
    Electronic Resource
    Parallel computational geometry (1988)
    Springer
    Algorithmica 3 (1988), S. 293-327 
    Details
    ISSN: 1432-0541
    Keywords: Parallel algorithms ; Computational geometry ; Data structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract We present efficient parallel algorithms for several basic problems in computational geometry: convex hulls, Voronoi diagrams, detecting line segment intersections, triangulating simple polygons, minimizing a circumscribing triangle, and recursive data-structures for three-dimensional queries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01762120
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A Simultaneous Search Problem (2000)
    Springer
    Algorithmica 26 (2000), S. 255-262 
    Details
    ISSN: 1432-0541
    Keywords: Key words. Algorithm, Binary search, Probe model, Comparison model, Metrology.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract. We introduce a new search problem motivated by computational metrology. The problem is as follows: we would like to locate two unknown numbers x,y ∈ [0,1] with as little uncertainty as possible, using some given number k of probes. Each probe is specified by a real number r∈ [0,1] . After a probe at r , we are told whether x≤ r or x \geq r , and whether y≤ r or y\geq r . We derive the optimal strategy and prove that the asymptotic behavior of the total uncertainty after k probes is 13/7 2 -(k+1)/2 for odd k and 13/10 2 -k/2 for even k .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004539910012
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  • 5
    Electronic Resource
    Electronic Resource
    The Fermi to Gamow-Teller mixing ratio of theβ + decay of52Mn and time-reversal invariance (1989)
    Springer
    The European physical journal 332 (1989), S. 285-287 
    Details
    ISSN: 1434-601X
    Keywords: 23.40-s ; 27.40+ z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract To date, ten experimental measurements of the asymmetry parameter have been made for the positron decay of52Mn. The Fermi to Gamow-Teller mixing ratioy can be deduced from such measurements and this quantity is important because the time-reversal violating amplitude is proportional toy/(1+y2). Our theoretical calculation using the Collective Model yieldsy=− 3.5×10−4 for the deformation parameterβ=0.1 andy=− 4.6×10−4 forβ=0.2. Such small values ofy are consistent with time-reversal invarisance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01295458
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  • 6
    Electronic Resource
    Electronic Resource
    Factors affecting the leaching of lead from UPVC pipes (1991)
    Springer
    Environmental monitoring and assessment 19 (1991), S. 203-213 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper summarizes the results of a series of studies on the various factors that affect the leaching of lead from unplasticized poly(vinyl chloride) (UPVC) pipes. Factors that were studied include temperature, pH and extractants. Results showed that, for a given UPVC pipe, the rate of leaching of lead depended primarily on temperature and the nature of extractants. While the rate of leaching of lead was quite low with distilled water, it was very much enhanced by the presence of low concentration of anions such as Cl-, HPO inf4 sup2- HCO inf3 sup- , NO inf3 sup- , SO inf4 sup2- and EDTA. EDTA, being a strong complexing agent, was most effective. Rates of leaching were found to be higher at elevated temperature except in the cases of HPO inf4 sup2- and EDTA. Effect of pH was not pronounced. The temperature at which the UPVC pipes were extruded was found to affect the rate of leaching of lead. Pipes extruded at 190°C were found to have lower rate of leaching than those extruded at 180°C and 170°C. Analysis of the pipes by Scanning Electron Microscopy showed that the distribution of lead in the pipes extruded at 190°C was more uniform than those extruded at 170°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401312
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  • 7
    Electronic Resource
    Electronic Resource
    Strontium/calcium ratio analysis of molluscan shells in Singapore waters using the X-ray fluorescence technique (1985)
    Springer
    Environmental monitoring and assessment 5 (1985), S. 325-332 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The Sr/Ca ratios in molluscan shells in Singapore waters were measured using the X-ray fluorescence (XRF) technique. Our results show that the Sr/Ca ratio varies greatly among different species. However, within the same species, this ratio is practically the same for samples collected from sites close together but varies significantly for samples from sites far apart. Furthermore, this study shows that whole shell analysis using the XRF technique is simple and quick and that its application to environmental monitoring seems feasible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394072
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  • 8
    Electronic Resource
    Electronic Resource
    Mixing with helical ribbon agitators: Part III. Non-Newtonian fluids (1979)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 25 (1979), S. 516-521 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The use of helical ribbon agitators to mix viscous non-Newtonian fluids has been investigated. A generalized model, based on an appropriate definition of effective viscosity, is proposed to predict power consumption. This model is most successful with fluids that do not have a high degree of elasticity.It was found that the efficiency of mixing of pseudoplastic fluids was about half of that of Newtonian fluids in the same mixer, while the efficiency of mixing viscoelastic fluids was still lower and approximately independent of the mixer geometry. Blade width was the primary variable affecting the mixing efficiency on inelastic fluids.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690250318
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Mixing with helical ribbon agitators: Part II. Newtonian FluidsPart I of this paper was published in Can. J. Chem. Eng., 54, 135 (1976). (1979)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 25 (1979), S. 508-516 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Of necessity, the mixing process is sometimes restricted to the laminar regime, although turbulent mixing is generally more desirable. Common examples of laminar mixing are found when the fluid has a very high viscosity, or when one of the mixture components is shear sensitive. It has been pointed out that the helical ribbon agitator (HRA) is admirably suited to the low Reynolds number mixing process. This work derives a model to predict the power consumption of the HRA. The model has been developed with the aid of experimental data and tested extensively using literature data. For a wide range of mixer geometries and sizes, it predicts power consumption with an average deviation of 13%.The concept of relative efficiency of mixers is also described as an aid to comparing different HRA mixer geometries. Finally, the problem of scale-up of different HRA configurations is discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690250317
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    An investigation of pressure transients in pipelines with two-phase bubbly flow (1989)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 9 (1989), S. 1207-1219 
    Details
    ISSN: 0271-2091
    Keywords: Centre implicit method ; Pressure transients ; Two-phase pipe flow ; Bubbly pipe flow ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper presents a two-dimensional model for the analysis of the pressure transient of a two-phase homogeneous bubbly mixture flowing in a pipeline and the numerical integration using the centre implicit method (CIM). Experiments were conducted to confirm the proposed sonic speed equation of an air-water mixture for an air concentration of less than 1%. The 2D CIM model is compared with the method of characteristics (MoC) for a two-phase bubbly flow in a pipeline. The comparisons show that the proposed 2D CIM model generally gives good agreement with the method of characteristics.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650091004
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    Paper (German National Licenses)
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