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  • 1
    Call number: PIK N 456-98-0152
    Type of Medium: Monograph available for loan
    Pages: 153 S.
    Edition: 1. Aufl.
    ISSN: 0941-780x
    Series Statement: Zentraler Fachdienst Wasser - Boden - Altlasten bei der Landesanstalt für Umweltschutz Baden-Württemberg 42 Handbuch Wasser 2
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 4681-4683 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: AlN layers were grown on Si(111) substrates by plasma-assisted molecular beam epitaxy. Crystal quality was assessed by atomic force microscopy and high resolution x-ray diffraction. The III/V ratio and the growth temperature, rather than thickness and growth rate, are found to be critical parameters to achieve good quality AlN layers. III/V ratios close to stoichiometry, and high growth temperatures (≥900 °C) lead to optimal AlN layers. The growth rate is barely modified when growth temperature changes from 780 to 920 °C, but the growth mode and surface roughness are strongly affected. Optimal AlN layers have full-widths at half-maximum values of 10 arcmin, and an average surface roughness of 48 Å. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 870-872 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: GaN photoconductive detectors have been fabricated on sapphire substrates by metal organic vapor phase epitaxy and gas-source molecular beam epitaxy on Si (111) substrates. The photodetectors showed high photoconductor gains, a very nonlinear response with illuminating power, and an intrinsic nonexponential photoconductance recovery process. A novel photoconductor gain mechanism is proposed to explain such results, based on a modulation of the conductive volume of the layer. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Limited previous experience with the mean value total dressing (MVTD) method had shown that MVTD energies for closed shell systems are generally better than CCSD(T) ones compared to FCI. The method, previously published as total dressing 2′(td-2′), is based on the single reference intermediate Hamiltonian theory. It is not a CC method but deals in a great part with the same physical effects that CC methods that incorporate amplitudes of triples such as CCSDT or its CCSDT-1n approaches. A number of test calculations comparing to diverse CC methods, as well as FCI and experiment when available, have been performed. The tests concern equilibrium energies in NH3 and CH2, equilibrium energies and distances in some diatomics (BF, NO+, CN+, C2, BeO), different bond breaking situations (H2O, BH, HF, SiH2) and spectroscopic properties of different bonding conditions (Li2, LiNa, LiBe+, NeH+, and O3). The results are in general closer to the full CCSDT ones in the equilibrium regions and close to CCSDT-1 along most dissociation curves. A few exceptions to this rule are analyzed with the help of an approach to MVTD that does not take into account the effects of linked quadriexcitations. Such analysis suggests the interest of improving the treatment of effects of linked triples in the MVTD model. The separate contributions of linked and unlinked triples and quadruples are also analyzed for some of the above diatomics representing different behaviors of bond breaking. The interest of such analysis is illustrated in the NeH+ molecule. The MVTD results show, in general, a high quality, provided that the nature of the correlation problem does not become largely multiconfigurational, as occurs in multiple bond dissociation or in the asymmetric stretching of ozone. © 1997 American Institute of Physics.
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  • 5
    ISSN: 0945-3245
    Keywords: Mathematics Subject Classification (1991):65N30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary. The bending terms in a shell are small with respect to membrane ones as the thickness tends to zero. Consequently, the membrane approximation gives a good description of vibration properties of a thin shell. This vibration problem is associated with a non-compact resolvent operator, and spectral pollution could appear when computing Galerkin approximations. That is to say, there could exist sequences of eigenvalues of the approximate problems that converge to points of the resolvent set of the exact problem. We give an account of the state of the art of this problem in shell theory. A description of the phenomenon and its interpretation in terms of spectral families are given. A theorem of localization of the region where pollution may appear is stated and its complete proof is published for the first time. Recipes are given for avoiding the pollution as well as indications on the possibility of a posteriori elimination.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of environmental contamination and toxicology 33 (1997), S. 117-124 
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. A study was carried out on the sorption of two sparingly water-soluble pesticides (diazinon and linuron) by a sandy loam soil modified with different exogenous organic materials (EOMs) containing humic-like substances: city refuse compost (CRC), peat (P), commercial “humic” acid (HA), liquid “humic” acid (LHA), and two (nonhumic) model compounds (surfactants), tetradecyltrimethylammonium bromide (TDTMA) and sodium dodecyl sulphate (SDS), before and after 2- and 8-month incubation periods with the soil. In all cases, the isotherms fitted the Freundlich sorption equation (x/m = KC e n ), generally with r 2 values greater than 0.99. The value of the sorption constant K for the natural soil was 8.81 for diazinon and 2.29 for linuron. These values increased significantly for EOM modified soils with respect to natural soil, with the exception of the samples modified with SDS and LHA, in which cases they decreased, possibly due to the micellar properties of these compounds. Incubation of EOMs with soil increased their sorption capacity: the K oc values were increased proportionally to the incubation time for both pesticides and for all treatments carried out. Accordingly, the sorption capacity of hydrophobic pesticides increases with the degree of evolution in the soil of EOMs with “humic”-type compounds, possibly due, among other causes, to the increase in the EOMs' colloidal properties and the modifications occurring in the hydrophobic-hydrophilic characteristics of the soil surfaces. The main conclusion is that application to the soil of carbon-rich wastes, especially those with a high degree of maturity, may offer an important strategy for reducing pesticide leaching and for eliminating pesticide residues from soil with the use of anionic surfactants.
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  • 7
    ISSN: 1436-6215
    Keywords: Dietary habits ; young university students ; concerns about nutrition ; Ernährungs ; gewohnheit ; Universitätsstudenten ; Ernährungsbesorgnis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Die Absicht dieser Studie war es, den Zusammenhang zwischen der Besorgtheit über Ernährung und den Lebensmittelkonsum bei 533 Universitätsstudenten (112 Männer und 421 Frauen), Durchschnittsalter 21.7±2.1 Jahre, zu untersuchen. Fisch, Milchprodukte und Obst wurden in ausreichendem Maße, Getreide und Gemüse hingegen wurden in kleineren Mengen als empfohlen, gegessen. Die Männer verzehrten mehr Milch, Fleisch, Brot und alkoholische Getränke, während die Frauen mehr Obst und Gemüse als die Männer aßen. 35,4 % der Studenten äußerten Besorgnis besonders über die Aufnahme von Fett und Cholesterin, 24,5 % waren speziell an der Gewichtskontrolle interessiert und 18,2 % sagten, ihre Hauptsorge gelte der korrekten Einnahme von Vitaminen und Mineralstoffen. 21,6 % der Teilnehmer hatten keine besondere Sorge bezüglich der Ernährung. Multiple Regressionsanalysen zeigten keinen Unterschied zwischen Männern und Frauen oder dem Body Mass Index (BMI) auf, was die Besorgtheit über die Ernährung betrifft. Aber man stellte einen altersbedingten Unterschied fest. Mit zunehmendem Alter zeigten die Studenten mehr Interesse zum Thema „Ernährung“, vor allem im Zusammenhang mit Vitaminen und Mineralstoffen. Die Besorgnis über die Gewichtskontrolle stieg mit steigendem BMI. Von denen, die ihr Gewicht reduzieren wollten, hatten allerdings 42,2 % der Frauen gegenüber 7,4 % der Männer einen BMI von 〈20 kg/m2. Da diese Studenten bereits sehr schlank waren (unter den empfohlenen Werten), aber trotzdem noch Gewicht verlieren wollten, könnte dies zu Mangelerscheinungen führen. Zusammenhänge zwischen der Besorgtheit und der Ernährungsweise waren kaum zu beobachten. Obwohl die Einnahme von Fett und Cholesterin als solche Anlass zur Besorgnis war, wurden zum Beispiel relativ viel Fleisch und Eier verzehrt. Es wurde eine Beziehung gefunden zwischen der Sorge um den Vitamin- und Mineralstoffgehalt der Nahrung und der Einnahme von Nahrungsergänzungsmittel sowie zwischen der Sorge um das Körpergewicht und der Einnahme von Produkten zur Gewichtsreduktion. Für die Lehrer der Ernährungswissenschaft kann diese Information behilflich sein, um ihre Kurse und Programme zu gestalten.
    Notes: Summary The aim of this investigation was to study the relationship between concern about nutrition and food consumption in 533 university students (112 men and 421 women), aged 21.7±2.1 years old. Fish, dairy products and fruit were consumed in quite satisfactory quantities though cereals and vegetables were consumed less frequently than recommended. Men were found to consume greater quantities of milk, meat, bread and alcoholic drinks, while women ate more fruit and vegetables than men. 35.4 % of subjects said they were especially concerned about the intake of fat and cholesterol, 24.5 % expressed special interest in weight control and 18.2 % recorded worries about the intake of vitamins and minerals. 21.6 % of subjects expressed no worries at all. Multiple regression analysis showed no differences in concern about nutrition with respect to the sex or body mass index (BMI) of subjects. However, as age increased, the number of subjects expressing no concern fell whilst worries over the quantity of vitamins and minerals in the diet increased. Worries about bodyweight were found to rise with BMI. However, amongst those who wanted to lose weight, 42.2 % of women and 7.4 % of men had a BMI 〈20 kg/m2. These persons, already very slim (below recommended values), still wished to lose weight and could become susceptible to nutritional imbalances. Relationships between concerns and food habits were scarce. Although fat and cholesterol were a concern in theory, the consumption of foodstuffs such as meat and eggs was quite high. However, relationships were found between concern over the vitamin and mineral content of the diet and the intake of supplements, and concern over bodyweight and intake of products that aid slimming. Nutrition educators may find this information useful in the design of their messages and educational programs.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 207 (1997), S. 216-228 
    ISSN: 1432-041X
    Keywords: Key words Drosophila ; Genital disc ; engrailed ; Compartment ; Homeotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The genital disc of Drosophila, which gives rise to the genitalia and analia of adult flies, is formed by cells from different embryonic segments. To study the organization of this disc, the expressions of segment polarity and homeotic genes were investigated. The organization of the embryonic genital primordium and the requirement of the engrailed and invected genes in the adult terminalia were also analysed. The results show that the three primordia, the female and male genitalia plus the analia, are composed of an anterior and a posterior compartment. In some aspects, each of the three primordia resemble other discs: the expression of genes such as wingless and decapentaplegic in each anterior compartment is similar to that seen in leg discs, and the absence of engrailed and invected cause duplications of anterior regions, as occurs in wing discs. The absence of lineage restrictions in some regions of the terminalia and the expression of segment polarity genes in the embryonic genital disc suggest that this model of compartmental organization evolves, at least in part, as the disc grows. The expression of homeotic genes suggests a parasegmental organization of the genital disc, although these genes may also change their expression patterns during larval development.
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  • 9
    Publication Date: 1997-08-18
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
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  • 10
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