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  • 1
    Series available for loan
    Series available for loan
    Ottawa : Geological Survey of Canada
    Associated volumes
    Call number: SR 90.0008(80-23)
    In: Paper
    Type of Medium: Series available for loan
    Pages: 171 S. + 1 pl.
    ISBN: 0660108623
    Series Statement: Paper / Geological Survey of Canada 80-23
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    ISSN: 1741-0444
    Keywords: Atrophy ; Denervation ; Fibre density ; Macro-EMG ; Reinnervation ; Simulation ; Single-fibre EMG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract To elucidate the relationship between various morphological motor unit parameters and electrophysiological findings obtained with single-fibre EMG (fibre density, FD) and macro-EMG, computer simulations were performed. FD and macro-MUP amplitude varied in parallel when fibre loss, fibre loss and corresponding motor unit territory shrinkage or fibre atrophy were simulated. When fibre loss and compensating reinnervation were produced the FD increased whereas the amplitude of the macro-MUP was unchanged. A discrepancy between the relative changes in these two EMG parameters seems to indicate uneven fibre distribution within the motor unit territory.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Personal and ubiquitous computing 2 (1998), S. 18-27 
    ISSN: 1617-4917
    Keywords: Context-aware ; Information filtering ; PDA ; Sensor ; Triggering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract With the increased availability of personal computers with attached sensors to capture their environment, there is a big opportunity forcontext-aware applications; these automatically provide information and/or take actions according to the user's present context, as detected by sensors. When well designed, these applications provide an opportunity to tailor the provision of information closely to the user's current needs. A sub-set of context-aware applications arediscrete applications, where discrete pieces of information are attached to individual contexts, to be triggered when the user enters those contexts. The advantage of discrete applications is that authoring them can be solely a creative process rather than a programming process: it can be a task akin to creating simple web pages. This paper looks at a general system that can be used in any discrete context-aware application. It propounds a general triggering rule, and investigates how this rule applies in practical applications.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 2 (1967), S. 199-200 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Flame ionisation detection ; Cyanogen ; Cyanogen chloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The response of a flame ionisation detector (FID) to cyanogen ((CN)2) and cyanogen chloride (CNCI) has been studied. The lower limits of detection for (CN)2 and CNCl were 6×10−12 moles and 2×10−11 moles respectively. In a comparative study a thermal conductivity detector gave as its lower limit of detection for both (CN)2 and CNCl 4×10−11 moles. Both detectors showed excellent linearity over the range 0 to 10 micromoles. The ratio of the gradients of the FID calibrations (CN)2/CNCI were found to be approximately two suggesting the response depended on the cyanide group. The response and stability of the FID was investigated as a function of air and hydrogen flow-rates. The response increased with increasing air flow-rate for both (CN)2 and CNCI up to 300cm3min−1, thereafter no significant increase was observed. On raising the hydrogen flow from 10 to 25cm3min−1 only a slight increase in the sensitivity of the FID towards both (CN)2 and CNCI was observed. At higher flow rates the response for (CN)2 increased markedly whereas at the same flow rates the response for CNCI increased only slightly.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The hydration stoichiometry, products and kinetics of dicalcium silicate are summarized. Hydration takes a similar course to tricalcium silicate, but at a much slower rate. The differences and similarities between the two compounds are identified and discussed, and future research needs identified.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Isothermal calorimetry was performed on intimate mixtures of CaHPO4·2H2O and Ca4(PO4)2O constituted at Ca/P molar ratios of 1.50 and 1.67 to form the hydroxyapatite compositions Ca9HPO4(PO4)5OH and Ca10(PO4)6(OH)2, respectively, at complete reaction. The temperature range investigated was 15–70°C. The effects of the reaction temperature on the rates of heat evolution during hydroxyapatite formation were determined. Reactions were carried out utilizing a liquid-to-solids weight ratio of 1.0. A two-stage reaction mechanism was observed regardless of the Ca/P ratio as indicated by the presence of two reaction peaks in the plots of the rates of heat evolution against time. An Arrhenius relationship was found between the rate and temperature for each reaction stage for both compositions. Apparent activation energies of 120 and 90 kJ/mol (Ca/P=1.67) and 118 and 83 kJ/mol (Ca/P=1.50), respectively, were calculated for the first and second reaction peaks. An Arrhenius relationship was also found between the time of maximum rate and temperature. The following qualitative reaction mechanism is proposed for each of the two reaction stages for both compositions studied. The first stage involves the complete consumption of CaHPO4·2H2O and the partial consumption of Ca4(PO4)2O to form a noncrystalline calcium phosphate and nanocrystalline hydroxyapatite. During the second stage the remaining Ca4(PO4)2O reacts with the noncrystalline calcium phosphate to form the final product, stoichiometric or calcium deficient hydroxyapatite.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Reactions between zirconyl nitrate hydrate and condensed phosphates can be used to produce castable low CTE sodium zirconium phosphate (NZP) monoliths. Reaction between sodium nitrate, zirconyl nitrate hydrate and condensed phosphoric acid at room temperature (alkali nitrate method) produces monoliths having a heterogeneous microstructure, which are multiphasic in appearance. Except for the presence of crystalline sodium nitrate, they are X-ray amorphous. Differential thermal analysis revealed two distinct exothermic crystallization events when these materials are heated. The first event, with an onset temperature of 650°C, is the result of NZP and ZrO2crystallization. The second is the result of ZrP2O7 crystallization. Reaction between zirconyl nitrate hydrate and condensed sodium phosphate (condensed alkali phosphate method) results in a more homogeneous microstructure in which crystalline zirconium hydrogen phosphate hydrate and sodium nitrate are present. Two exothermic peaks, with onset temperatures of approximately 570 and 860°C, are observed. The first exotherm is the result of NZP, ZrO2 and ZrP2O7 crystallization; the second exotherm is the result of a further NZP formation. After heating materials made by these two methods at 940°C for 24 h, the condensed-alkali-phosphate-method-derived material converted to phase-pure NZP, while the alkali-nitrate-method-derived material contained ZrP2O7. The differences in phase evolution between the materials prepared by these two methods are attributable to the differences in chemical and microstructural homogeneity that result from the reactants used.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-2991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Summary Schools and higher education institutions in Sweden have developed a wide range of innovative and demanding curricula to meet the objectives of Sweden's environmental policy. Environmental education in compulsory schools is taught principally through biological sciences, although social studies are beginning to occupy a substantial component of the environmental curriculum. Upper secondary schools offer more opportunities to develop environmental awareness, understanding and practical skills than comparable sixth form and post-secondary colleges in England. In Sweden there is a strong emphasis on practical work developed through projects based on contemporary environmental issues and their resolution. The development of environmental education has been well supported by a substantial input of new resources, especially materials developed by the Swedish Environmental Protection Agency and Industry. Universities have also begun to adopt new organisational structures to help develop inter-disciplinary teaching and research teams. Several universities are experimenting with ‘common core’ courses, parts of which comprise environmental elements.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-3017
    Keywords: wildlife ; bird-repellent ; cholinesterase ; histology ; residues
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: A field trial was carried out in Kent, UK, in 1980, to assess the possible hazards to wildlife of methiocarb used as a spray to protect ripening cherries from damage by birds. A broad range of studies was undertaken on a single site subjected to a series of five applications. Ground deposition was measured by analysis of strips of chromatography paper and petri dishes placed between lines of trees. Airborne drift was measured on targets up to 11 m above the ground, and methiocarb residues were measured in samples of cherries. Birds were captured by intensive mist-netting throughout the trial, and breeding success was monitored in nest boxes and natural nest sites. Livetraps were set to catch small mammals in the orchard on five occasions during the trial. Systematic searches for possible casualties were made, resulting in the discovery of 21 birds found dead or incapacitated. Levels of activity of plasma, liver and brain esterases were measured in samples taken from several species, and liver slices from House Sparrows, Starlings and Thrushes were examined histologically for signs of cell damage. Samples of breast muscle tissue from Starlings and House Sparrows were analysed by GLC for residues of methiocarb and its principal breakdown product, methiocarb sulfoxide. Overall, the trial revealed that many birds and mammals were exposed to methiocarb, but its effects were largely transient and sublethal. Even a heavy repeated programme of spray applications did not cause any serious hazard to wildlife populations.
    Type of Medium: Electronic Resource
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