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  • Inorganic Chemistry  (14)
  • Boltzmann equation  (2)
  • Questionnaire  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 87 (1997), S. 821-845 
    ISSN: 1572-9613
    Keywords: Fermi gas ; van Hove limit ; Boltzmann equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study a Fermi gas with general translation-invariant many-body interactions on a (v≥3)-dimensional lattice. A complete analysis is given of the perturbative terms up to second order and the program put forward by N. M. Hugenholtz for the derivative of the Boltzmann equation is verified to second order.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International archives of occupational and environmental health 59 (1987), S. 107-114 
    ISSN: 1432-1246
    Keywords: Questionnaire ; Job analysis (AET) ; Older workers ; Profile groups ; Work-related diseases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The occupational stress factors related to specific cardiovascular diseases were studied by a questionnaire mailed to 6213 municipal employees aged 45 to 58 years, (response rate 85%) and by a specific job analysis of certain municipal occupations. The highest prevalences of self-reported chronic hypertension were found among male transport workers (19%), technical supervisors (19%) and auxiliary workers (15%), as well as among female domestic helpers (18%) and auxiliary workers (18%). Among men the prevalence of coronary heart disease varied from 9% for dump workers to 0% for dentists (mean 5%) and among women from 4% for kitchen supervisors to 0% for physicians (mean 3%). In the work profile groups with the highest rates of reported, specific cardiovascular diseases, the stress factors of women's work (domestic help and auxiliary work) were high energy demands, heavy dynamic and static work with high application of strength, poor postures, and uncomfortable climatic conditions. These stress factors were also typical among men doing auxiliary work. Other common stress factors among men included sensory-motor work done alone in static, monotonous sitting postures, exposured to vibration, drafts, and continuous alertness of the senses (transport work) and to processing and organization of information together with time pressure linked to decision-making and the need for accurate sensory perception (technical supervision work).
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International archives of occupational and environmental health 43 (1979), S. 17-35 
    ISSN: 1432-1246
    Keywords: Job description ; Questionnaire ; Area of requirement: Activity ; Field study ; Tätigkeitsanalyse ; Erhebungsverfahren ; Anforderungsbereich: Handlung ; Feldstudie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Entwicklung spezifischer Supplemente zum Arbeitswissenschaftlichen Erhebungsverfahren zur Tätigkeitsanalyse (AET) bietet sich für homogene Tätigkeitsgruppen an, für die der AET zweckbezogen nicht ausreichend differenziert. Zur Erfassung und Beurteilung von Körperstellungen und Körperbewegungen wird daher ein Arbeitswissenschaftliches Erhebungsverfahren zur Tätigkeitsanalyse zum Anforderungsbereich Handlung (H-AET) entwickelt und bei industriellen Montagetätigkeiten eingesetzt. Die vorliegende Arbeit beschreibt Inhalt und Struktur des H-AET. Die Ergebnisse einer Feldstudie werden mit den Methoden der Dendrogramme und Profildarstellungen dargelegt, und es werden Tätigkeitsgruppen auch innerhalb eines Arbeitssystems mit hohem Homogenitätsgrad systematisiert.
    Notes: Summary The development of specific supplements of the Ergonomic Job Description Questionnaire (EJDQ) is suitable for homogeneous groups of jobs for the use of which the EJDO does not differentiate sufficiently. For the documentation and assessment of body positions and body movements thus and Ergonomic Description Questionnaire for the area of requirement ‘Activity’ (A-EJDQ) is being developed and practiced in industrial assembly activities. The present paper describes the contents and structure of the A-EJDQ. The results of a field study are presented by the methods of the dendograms and profile analysis. Thus a systematization of groups of activities also becomes possible within one work system with a high degree of homogeneity.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 77 (1994), S. 259-309 
    ISSN: 1572-9613
    Keywords: Lorentz gas ; Boltzmann equation ; Landau equation ; Van Hove limit ; weak-coupling limit ; random potential ; quantum trajectories
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A quantum particle observed on a sufficiently large space-time scale can be described by means of classical particle trajectories. The joint distribution for large-scale multiple-time position and momentum measurements on a nonrelativistic quantum particle moving freely inR v is given by straight-line trajectories with probabilities determined by the initial momentum-space wavefunction. For large-scale toroidal and rectangular regions the trajectories are geodesics. In a uniform gravitational field the trajectories are parabolas. A quantum counting process on free particles is also considered and shown to converge in the large-space-time limit to a classical counting process for particles with straight-line trajectories. If the quantum particle interacts weakly with its environment, the classical particle trajectories may undergo random jumps. In the random potential model considered here, the quantum particle evolves according to a reversible unitary one-parameter group describing elastic scattering off static randomly distributed impurities (a quantum Lorentz gas). In the large-space-time weak-coupling limit a classical stochastic process is obtained with probability one and describes a classical particle moving with constant speed in straight lines between random jumps in direction. The process depends only on the ensemble value of the covariance of the random field and not on the sample field. The probability density in phase space associated with the classical stochastic process satisfies the linear Boltzmann equation for the classical Lorentz gas, which, in the limith→0, goes over to the linear Landau equation. Our study of the quantum Lorentz gas is based on a perturbative expansion and, as in other studies of this system, the series can be controlled only for small values of the rescaled time and for Gaussian random fields. The discussion of classical particle trajectories for nonrelativistic particles on a macroscopic spacetime scale applies also to relativistic particles. The problem of the spatial localization of a relativistic particle is avoided by observing the particle on a sufficiently large space-time scale.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 665-669 
    ISSN: 0009-2940
    Keywords: Semideltic acid ; Cyclopropenylium cations ; Pseudooxocarbon anions ; Semideltate anions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pseudooxocarbon Anions of Semideltic AcidNovel pseudooxocarbon anions of semideltic acid (2) can easily be obtained by stepwise substitution of the dimethylamino groups of the cyclopropenium perchlorate 8. Treatment of 8 with cyanamide or malononitrile in the presence of triethylamine leads to the triafulvenes 9 and 13. Two cyanoimino groups are successfully introduced into the cyclopropenylium system by treating 9 with excess cyanamide/potassium ethoxide. Under the same conditions malononitrile reacts with 13 to yield the potassium salts 14 and 17. The thioamide 26 of semideltic acid is obtained by treating the triphenylphosphonium salt 24 with H2S/pyridine and subsequent hydrolysis of the intermediate 25. With the anions of cyanamide or malononitrile ring-opening reaction of the cyclopropenylium system of 24 occurs to yield the push-pull phosphonium salts 28 and 29.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 218 (1934), S. 321-345 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde für das Teildreieck Pb—Cu2S—Pb—S das Raumdiagramm entworfen und für dieses sowie fär das Teildreieck Pb—Cu2S—Cu die Gleichgewichtsverhältnisse sämtlicher möglichen Legierungen von der beginnenden bis zur beendeten Kristallisation dargestellt. Im Anschluß daran wurden verschiedene Legierungen aus der Arbeit von K. L. MEISSNER und verschiedene eigene Legierungen besprochen.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 31 (1898), S. 2090-2094 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 33 (1900), S. 2440-2442 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 33 (1900), S. 2442-2446 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 33 (1900), S. 2446-2453 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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