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  • Springer  (84)
  • American Institute of Physics  (13)
  • American Geophysical Union  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Parallel computation and numerical optimisation (1984)
    Springer
    Annals of operations research 1 (1984), S. 135-149 
    Details
    ISSN: 1572-9338
    Keywords: Optimisation ; parallel computation ; DAP ; SIMD ; MIMD ; speed-up
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract In this paper we will consider the effect of introducing parallel computers to solve optimisation problems. We briefly highlight four situations where most improvements are likely. We consider the possible interaction of the four classifications with the currently available parallel processing machines. A brief description of one of the parallel systems, ICL DAP, is outlined. We have implemented two parallel (SIMD) algorithms, one for local optimisation and the other for global optimisation, on the ICL DAP. Numerical results, together with the processing times, are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01876144
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  • 2
    Electronic Resource
    Electronic Resource
    Ascorbic acid and ascorbic acid oxidase of γ-irradiatedMomordica charantia (1965)
    Springer
    Naturwissenschaften 52 (1965), S. 345-346 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00592014
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of pre-germination chemical treatment on ascorbic acid and ascorbic acid oxidase of pea-nut (1965)
    Springer
    Naturwissenschaften 52 (1965), S. 166-167 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00609292
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  • 4
    Electronic Resource
    Electronic Resource
    Solvent extraction and spectrophotometric including graphite furnace atomic absorption determination of molybdenum in the environment (1996)
    Springer
    Microchimica acta 122 (1996), S. 259-265 
    Details
    ISSN: 1436-5073
    Keywords: molybdenum ; AAS ; solvent extraction of Mo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A selective and sensitive method for the extraction and microgram determination of molybdenum (VI) with hydroxamic acid as yellow molybdenum-hydroxamate complex from acidic medium is described. The molybdenum-PCPPSAHA complex has λmax 388 nm, molar absorptivity 5.0 × 103l mol−1 cm−1. The system obeys Beer's law in the range of 1–28 μg/ml of molybdenum(VI). Sandell's sensitivity is 0.0192 μg cm2 and stoichiometry of the complex is 1∶2, molybdenum: PCPPSAHA while mixed complex molybdenum-PCPPSAHA-morin has λmax 400 nm and molar absorptivity 5.9 × 103lmo1−1 cm−1 and stoichiometry of the complex is 1∶2∶1. The molybdenum is determined by graphite furnace atomic absorption spectrophotometry after directly pipetted the extract into the furnace which increases the sensitivity 20 fold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245786
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  • 5
    Electronic Resource
    Electronic Resource
    The extractive-photometric determination of Iron(III), vanadium(V) and molybdenum(V) as mixed complexes with thiocyanate and N-hydroxy-N-(p-chlorophenyl)-N′-(2,3-dimethylphenyl)-p-toluamidine hydrochloride (1979)
    Springer
    Microchimica acta 71 (1979), S. 353-360 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung N-Hydroxy-N-(p-chlorphenyl)-N′-(2,3-dimethylphenyl)-p-toluamidinhydrochlorid reagiert mit Fe(III), V(V) und Mo(V) in thiocyanathältigem Medium unter Bildung wasserunlöslicher, gemischter Komplexe, die sich mit Benzol extrahieren lassen. Die großen Unterschiede der für die Bildung dieser Komplexe erforderlichen analytischen Bedingungen bieten die Voraussetzung für eine einfache, rasche und empfindliche extraktions-photometrische Methode zur Bestimmung dieser Elemente im Mikrogramm-Maßstab. Cr(III), Mn(II), W(VI), Ti(IV) und Zr(IV) stören nicht. Das Verfahren wurde an Hand künstlicher Gemische erprobt.
    Notes: Summary N-Hydroxy-N- (p- chlorophenyl)-N′-(2,3-dimethylphenyl)-p-toluamidine hydrochloride reacts with Fe3+, V5+ and Mo5+ in thiocyanate media, giving water-insoluble mixed complexes, extractable into benzene. The large differences in the analytical conditions for formation of the mixed complexes of these elements affords a simple, rapid and sensitive extraction-photometric method for determination of these elements at microgram levels. Cr3+, Mn2+, W6+, Ti4+ and Zr4+ do not interfere. The method has been applied for determination of these elements in artificial mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197405
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  • 6
    Electronic Resource
    Electronic Resource
    Specific method for spectrophotometric determination of molybdenum in soil (1998)
    Springer
    Microchimica acta 129 (1998), S. 265-269 
    Details
    ISSN: 1436-5073
    Keywords: molybdenum ; spectrophotometry ; solvent-extraction ; sodium borohydride ; thiocyanate ; surfactants ; soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new, simple and specific spectrophotometric method for the determination of Mo in the soil extracts is described. Mo(VI) is reduced to Mo(V) with sodium borohydride and allowed to react with SCN− ions in the presence of cationic and neutral surfactants e.g. CPC and TX-100 in the acidic aqueous solution. The molar absorptivity of the complex in both the aqueous, and toluene solutions is (2.30) × 104 1mol−1 cm−1 at absorption maximum, 460 nm. The extraction-procedure preconcentrated Mo at least 3-folds. the detection limit is 125ng Mo/g soil. The analytical variables of the method have been optimised and composition of the complex is proposed. None of the tested foreign ion interfered in the determination of Mo up to a large amount. An attempt for the removal of Fe-interference in the determination of Mo in soil extract has been described. The method has been found to be satisfactorily applicable for the determination of Mo in hot water leachates and acid digested soil solutions at lower ppm levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244750
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  • 7
    Electronic Resource
    Electronic Resource
    Selective and sensitive extraction-photometric determination of vanadium(V) withN-hydroxy-N-p- chlorophenyl-N'-(3-chloro-4-methylphenyl)-p-toluamidine in the presence of carboxylic acids (1979)
    Springer
    Microchimica acta 72 (1979), S. 53-61 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein einfaches, schnelles, empfindliches und hochselektives Verfahren zur Extraktion und photometrischen Bestimmung von Mikromengen Vanadin (V) wurde beschrieben. Es beruht auf der Bildung des Komplexes VO(OAm)2OH durch Umsetzung von V(V) mitN-Hydroxy-N-p-Chlorphenyl-N'-(3-Chlor-4-Methylphenyl)-p-Toluamidin und Extraktion als 1∶1-Addukt [VO(OAm)2OH∶L] mit verschiedenen Carbonsäuren in Chloroform (wobei HOAm=N-Hydroxyamidin und L=Carbonsäure). Die Art der Carbonsäuren hat großen Einfluß aufλ max undɛ der ternären Komplexe. Die Ausscheidereagenzien wie z. B. Oxal-, Bernstein-, Fumar-, Zitronen-, Weinsäure usw. werden auch als Synergisten bei der Extraktion von V(V) verwendet. Die molaren Extinktionen der Extrakte liegen zwischen 3100 und 6700 1 · Mob-1 · cm-1. Fe3+, Cu2+, Zn2+, Co2+, Ni2+, Cr3+, Mn2+, Ti4+, Zr4+, Mo6+ und W6+ stören nicht. Das Verfahren wurde auf verschiedene Legierungen angewendet.
    Notes: Summary A simple, rapid, sensitive and highly selective method for extraction-photometric determination of microamounts of vanadium(V) is described. The method is based on the formation of the VO(OAm)2-OH complex by the reaction of vanadium(V) withN-hydroxy-N-p-chlorophenyl-N'-(3-chloro-4-methylphenyl)-p-toluamidine, and its extraction into chloroform as 1∶1 adducts [VO(OAm)2OH∶L] (where HOAm=theN-hydroxyamidine and L=carboxylic acid) with various carboxylic acids. The nature of carboxylic acids has large effect in theλ max andɛ of ternary complexes. The sequestrating agents e. g. oxalic, succinic, fumaric, citric, tartraric acid have been also used as a Synergist in the extraction of vanadium(V). Apparent molar absorptivities of the extracts lie in the range of 3100–6700 l · mole−1 · cm−1. Fe3+, Cu2+, Zn2+, Co2+, Ni2+, Cr3+, Mn2+, Ti4+, Zr4+, Mo6+ and W6+ do not interfere. The method has been applied to various alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198048
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  • 8
    Electronic Resource
    Electronic Resource
    Field determination of molybdenum in soils (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 355-356 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new procedure for the field characterization of the available amount of molybdenum in soil extract is described. It is based on the preconcentration of the Mo(V)-SCN– complex into toluene solution of N-octylacetamide (OAA) and subsequent heating of the extract for ≈ 10 min at 60° C over a water bath. The molar absorptivity of the complex is (3.50) × 104 1 mole–1 cm–1 at λmax 470 nm. The detection limit of the method is 4 ppb Mo. It provides a significantly increased tolerance limit for iron (up to 1000 ppm) and is applicable to the field characterization of Mo in soil extracts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050168
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of antimony in rain water at the nanogram level with surfactant and brilliant green (1998)
    Springer
    Fresenius' journal of analytical chemistry 360 (1998), S. 270-272 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new, simple, selective and sensitive method for the spectrophotometric determination of antimony in rain water is described. It includes preconcentrating Sb with surfactants (i.e. cetylpyridinium chloride (CPC) and Triton X-100 (TX-100)) into toluene and allowing the extract to react with a dye, i.e. brilliant green (BG). The value of apparent molar absorptivity is 5.55 × 105 L-mol–1· cm–1 at λmax = 620 nm; the detection limit is 3 ng/mL Sb in rain water at 3-fold preconcentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050689
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  • 10
    Electronic Resource
    Electronic Resource
    Flow injection analysis of Zn and Co in beverages, biological, environmental and pharmaceutical samples (1998)
    Springer
    Fresenius' journal of analytical chemistry 362 (1998), S. 571-576 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new, simple, rapid and selective flow injection analysis (FIA) method for the spectrophotometric quantification (speciation of inorganic and organic form) of Zn and Co with ammonium thiocyanate and malachite green (MG) in the presence of surfactants (CPC and TX-100) is described. The value of apparent molar absorptivity of the Zn- and Co- complexes are (1.23) × 104 and (8.67) × 103 L mol–1cm–1 at absorption maximum, 635 nm, respectively. The detection limit (amount causing a peak height 〉 3 s) is 15 ppb Zn and 20 ppb Co, whereas their optimum working ranges for the quantitative determinations are 0.05–2.0 ppm Zn and 0.07–2.5 ppm Co in the real samples. The sample thoughput of the method is 120 samples/h at the flow rate of 5.0 mL/min with rel. std. dev. of 〈 ± 1%. The method is free from interferences of almost all ions which are commonly associated with these metals in the complex materials. The composition of the complexes and their reaction mechanism involved are discussed. The effect of FIA and analytical variables for the determination of the metals are optimized. The method has been applied to the quantification of Zn and Co in beverages, biological, environmental, and pharmaceutical samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051126
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