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  • Springer  (138)
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  • 1998  (138)
  • 1
    Electronic Resource
    Electronic Resource
    Groundwater pollution due to discharge of industrial effluents in Venkatapuram area, Visakhapatnam, Andhra Pradesh, India (1998)
    Springer
    Environmental geology 33 (1998), S. 289-294 
    Details
    ISSN: 1432-0495
    Keywords: Key words Industrial effluent ; Groundwater pollution ; Pathlines ; Mass-transport model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Hindustan Polymers Limited was established in the Venkatapuram area in the northwestern part of Visakhapatnam urban agglomeration. Untreated industrial effluent from the plant is discharged with total dissolved solids concentrations reaching up to 6500 mg/l. The groundwater pollution was identified as early as 1981 and a hydrogeologic and water-quality database is available from 1981. The groundwater quality in the plant environs is found to be in the range of 3500–4500 mg/l. Major chemical constituents of industrial-waste waters consist of Na, Cl, and SO4. Some characteristic parameters of the aquifer were estimated. The available hydrogeologic and hydrologic data was analyzed to conceptualize the groundwater regime. A mathematical groundwater flow model was constructed to compute the hydraulic head at the center of finite-difference grid. The computed head distribution and effective porosity of the formations were used to calculate the groundwater flow velocity. The computed velocity field was ultimately used to prognose the pollutant migration in groundwater accounting for the advection and dispersion processes in the mass transport model and for determining the time-dependent pathlines of pollutant. Areal migration of pollutants from the source was predicted up to year 2002.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050248
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  • 2
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    Groundwater pollution due to discharge of industrial effluents in Venkatapuram area, Visakhapatnam, Andhra Pradesh, India (1998)
    Springer
    Details
    Publication Date: 1998-03-12
    Print ISSN: 0943-0105
    Electronic ISSN: 1432-0495
    Topics: Geosciences
    Published by Springer
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    On the analysis of single server finite queue with state dependent arrival and service processes:M(n)/G(n)/1/K (1998)
    Springer
    OR spectrum 20 (1998), S. 83-89 
    Details
    ISSN: 1436-6304
    Keywords: Single server queue ; computational ; state dependent arrival rates ; state dependent service time distributions ; finite ; Ein-Bediener-Modelle ; zustandsabhängige Ankunftsraten ; zustandsabhängige Bedienungszeitverteilungen ; endlicher Warteraum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Es wird die Analyse eines endlichen Ein-Bediener-Modells mit Poisson-Ankunft und beliebiger Bedienungszeitverteilung untersucht, worin die Ankunftsrate zustandsabhängig sind, und zwar alle verschieden oder alle gleich, und die Bedienungszeitverteilungen von der Kundenzahl zu Beginn der Bedienung abhängen. Die Ergebnisse werden in Form von rekursiven Gleichungen angegeben, die leicht auf einem PC programmiert werden können. Man erhält so die Verteilungen der Kundenzahlen im System zu beliebigen Zeitpunkten sowie zu Abgangs- und Vorankunftszeiten. Es wird gezeigt, daß die Methode für alle Bedienungszeitverteilungen funktioniert, einschließlich Nicht-Phasen-Typen, und auch für unterschiedliche Werte der Modellparameter. Einige Leistungsmaße und Beziehungen zwischen den Zustandswahrscheinlichkeiten zu beliebigen Zeitpunkten sowie zu Abgangs- und Vorankunftszeiten werden diskutiert. Außerdem wird gezeigt, daß man bekannte Ergebnisse für einfachere Bedienungmodelle als Spezialfälle erhält. Einige numerische Beispiele zeigen die Effektivität unserer Methode.
    Notes: Abstract This paper discusses the analysis of a single server finite queue with Poisson arrival and arbitrary service time distribution, wherein the arrival rates are state dependent which are all distinct or all equal, service times are conditioned on the system length at the moment of service initiation. The analytic analysis of the queue is carried out and the final results have been presented in the form of recursive equations which can be easily programmed on any PC to obtain the distributions of number of customers in the system at arbitrary, departure and pre-arrival epochs. It is shown that the method works for all service time distributions including the non-phase type and also for low and high values of the model parameters. Some performance measures, and relations among the state probabilities at arbitrary, departure and pre-arrival epochs are also discussed. Furthermore, it is shown that results for a number of queueing models can be obtained from this model as special cases. To demonstrate the effectiveness of our method some numerical examples have been presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01539856
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  • 4
    Electronic Resource
    Electronic Resource
    On the analysis of single server finite queue with state dependent arrival and service processes: $M(n)/G(n)/1/K$ (1998)
    Springer
    OR spectrum 20 (1998), S. 83-89 
    Details
    ISSN: 1436-6304
    Keywords: Key words: Single server queue, computational, state dependent arrival rates, state dependent service time distributions, finite ; Schlüsselwörter: Ein-Bediener-Modelle, zustandsabhängige Ankunftsraten, zustandsabhängige Bedienungszeitverteilungen, endlicher Warteraum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung. Es wird die Analyse eines endlichen Ein-Bediener-Modells mit Poisson-Ankunft und beliebiger Bedienungszeitverteilung untersucht, worin die Ankunftsrate zustandsabhängig sind, und zwar alle verschieden oder alle gleich, und die Bedienungszeitverteilungen von der Kundenzahl zu Beginn der Bedienung abhängen. Die Ergebnisse werden in Form von rekursiven Gleichungen angegeben, die leicht auf einem PC programmiert werden können. Man erhält so die Verteilungen der Kundenzahlen im System zu beliebigen Zeitpunkten sowie zu Abgangs- und Vorankunftszeiten. Es wird gezeigt, daß die Methode für alle Bedienungszeitverteilungen funktioniert, einschließlich Nicht-Phasen-Typen, und auch für unterschiedliche Werte der Modellparameter. Einige Leistungsmaße und Beziehungen zwischen den Zustandswahrscheinlichkeiten zu beliebigen Zeitpunkten sowie zu Abgangs- und Vorankunftszeiten werden diskutiert.Außerdem wird gezeigt, daß man bekannte Ergebnisse für einfachere Bedienungmodelle als Spezialfälle erhält. Einige numerische Beispiele zeigen die Effektivität unserer Methode.
    Notes: Abstract. This paper discusses the analysis of a single server finite queue with Poisson arrival and arbitrary service time distribution, wherein the arrival rates are state dependent which are all distinct or all equal, service times are conditioned on the system length at the moment of service initiation. The analytic analysis of the queue is carried out and the final results have been presented in the form of recursive equations which can be easily programmed on any PC to obtain the distributions of number of customers in the system at arbitrary, departure and pre-arrival epochs. It is shown that the method works for all service time distributions including the non-phase type and also for low and high values of the model parameters. Some performance measures, and relations among the state probabilities at arbitrary, departure and pre-arrival epochs are also discussed. Furthermore, it is shown that results for a number of queueing models can be obtained from this model as special cases. To demonstrate the effectiveness of our method some numerical examples have been presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002910050055
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  • 5
    Electronic Resource
    Electronic Resource
    Periodicity in midwest US climatic data: the Hale cycle signal or the luni-solar signal? (1998)
    Springer
    Stochastic environmental research and risk assessment 12 (1998), S. 205-222 
    Details
    ISSN: 1436-3259
    Keywords: Key words: Hale cycle ; luni-solar tidal constituent ; maximum entropy spectrum ; multi-taper method ; harmonic analysis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract: Cohen and Sweeter (1975) found the 20 to 22-year Hale (double sunspot) cycle signal in the maximum entropy spectra of sunspot and Atlantic tropical cyclone data. Currie (1996) corroborated and extended their analysis, but he argued that this signal is the 18.6-year luni-solar tidal constituent. Currie maintains that Cohen and Sweeter mistakenly conjectured that this long term periodicity was induced by the 20 to 22-year Hale cycle signal. However, no further investigation of periodicity in the extracted wave forms corresponding to the 18.6-year luni-solar signal was conducted. In this study, we follow Currie's signal processing procedures to extract the wave forms corresponding to the 18.6-year luni-solar signal. In order to investigate the periodicity in the extracted wave forms, multi-taper method (MTM) is used for harmonic analysis. Band pass filters are then designed to extract the wave forms corresponding to the individual components identified in the MTM harmonic analysis. The investigation results of the monthly precipitation and Palmer's drought severity index (PDSI) data in three of the midwestern states – Illinois, Indiana and Ohio – show that two periodic components, the 20 to 22-year Hale cycle signal and the other component with periods between 16.9 and 13.5 years, are identified. The bistability phenomenon, which Currie found in these wave forms, is more likely to result from the superposition of these two periodic components, rather than from a nonlinear mechanism. Besides, a periodic component with an approximate period of 33 years is detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004770050018
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of support modification on the chlorobenzene hydrodechlorination activity on Pt/Al2O3 catalysts (1998)
    Springer
    Catalysis letters 50 (1998), S. 77-82 
    Details
    ISSN: 1572-879X
    Keywords: modified alumina ; supported platinum catalysts ; H2 chemisorption ; BET area ; XRD ; hydrodechlorination ; chlorobenzene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Al2O3 was modified with TiO2 and ZrO2 using organometallic precursors and is used in the preparation of supported platinum catalysts. The catalysts have been characterised by nitrogen adsorption, hydrogen chemisorption and X-ray diffraction and were tested for their activity in the hydrodechlorination of chlorobenzene. The investigations show that support modification controls the catalyst deactivation remarkably and the catalysts were found to be highly active and selective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019058800707
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  • 7
    Electronic Resource
    Electronic Resource
    Selective synthesis of 2-methylquinoline over zeolites (1998)
    Springer
    Catalysis letters 56 (1998), S. 155-158 
    Details
    ISSN: 1572-879X
    Keywords: zeolite ; alkylation ; quinoline ; 2-methylquinoline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The selective vapour-phase synthesis of 2-methylquinoline by alkylation of quinoline with methanol was carried out over HY, HZSM-5(30), CrHY, CeHY, LaHY, LaKHY and CeHZSM-5(30) zeolites in a fixed-bed reactor at atmospheric pressure. The yields of 2-methylquinoline over modified zeolites, especially those of doubly promoted LaKHY, were found to be higher than those of unmodified zeolites. The maximum yield of 2-methylquinoline obtained was 60.6 wt% at 91.5 wt% selectivity over LaKHY zeolite. The active sites responsible for this methylation were found to be more on Lewis acidic sites available over zeolite systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019057012345
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  • 8
    Electronic Resource
    Electronic Resource
    Strategic Purely Nonatomic Random Walks (1998)
    Springer
    Journal of theoretical probability 11 (1998), S. 409-415 
    Details
    ISSN: 1572-9230
    Keywords: Strategic measures ; random walk ; simply atomic ; purely non-atomic ; disjointed tree
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this note we describe a class of Random Walks on integers in the finitely additive setup which are purely nonatomic in contrast to the countably additive setup where all random walks are simply atomic, a result of David Blackwell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022631805708
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  • 9
    Electronic Resource
    Electronic Resource
    Solubility of Crystalline Calcium Isosaccharinate (1998)
    Springer
    Journal of solution chemistry 27 (1998), S. 1109-1122 
    Details
    ISSN: 1572-8927
    Keywords: Isosaccharinic acid ; solubility product ; aqueous complexes ; Ca complexes ; thermodynamic data
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The solubility of calcium isosaccharinate Ca(ISA)2(c) was determined at 23°C as a function of pH (1–14) and calcium ion molality (0.03–0.52). The similarity of solubility from the over- and undersaturation directions for different equilibration periods indicated that equilibrium in these solutions was reached rapidly (〈 7 days) and that these data can be used to develop thermodynamic equilibrium constants. The solubility data were interpreted using the Pitzer ion–interaction model. The logarithms of the thermodynamic equilibrium constants determined from these data were 1.30 for the dominant reaction at pH 〈 4.5 [Ca(ISA)2(c) + 2H+ ⇌ Ca2+ + 2HISA(aq)], and −2.22 for the dominant reaction at 4.5 [Ca(ISA)2(c)+ ⇌ Ca(ISA)2(aq)]. In addition, the logarithm of the dissociation constant of HISA [HISA(aq) ⇌ ISA- + H+] was calculated to be −4.46.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022610001043
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  • 10
    Electronic Resource
    Electronic Resource
    Laser spectroscopy investigation of the nuclear moments and radii of lutetium isotopes (1998)
    Springer
    The European physical journal 3 (1998), S. 225-235 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 21.10.Ft Charge distribution – 21.10.Hw Spin, parity, and isobaric spin – 21.10.Ky Electromagnetic moments – 27.70.+q 150 ≤ A ≤ 189 – 32.10.Fn Fine and hyperfine structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Collinear laser spectroscopy experiments in the LuI transition 5d6s2 2D3/2→ 5d6s6p 2D3/2 were performed on all lutetium isotopes in the range of 161-179Lu. The nuclear spins, magnetic moments and quadrupole moments were determined from the hyperfine structures observed for 19 ground states and 11 isomers. Variations in the mean square charge radii as a function of neutron number were obtained from the isotope shifts. These data considerably extend the systematics of the properties of nuclei in the upper rare-earth region. A particular feature is the appearance of high-spin and low-spin ground states and isomeric states in the vicinity of the stable 175Lu, partly arising from aligned neutron pairs. The results clearly show that the deformation properties are nearly independent of the occupancy and the coupling of single-particle states. Theoretical predictions of deformation are confirmed in a consistent description of the measured radii and quadrupole moments. For all observed states, the spins and magnetic moments allow the assignment of rather pure Nilsson configurations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050172
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