ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (63)
  • Springer  (31)
  • Institute of Physics  (29)
  • Nature Publishing Group  (3)
Collection
  • Articles  (63)
Source
Publisher
Years
Journal
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Plant Growth Regulating Properties of Some Acetone Condensation Products (1969)
    [s.l.] : Nature Publishing Group
    Nature 223 (1969), S. 1386-1387 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1. GROWTH REGULATING ACTIVITY OF ACETONE CONDENSATION PRODUCTS BASED ON THE BEAN SECOND INTERNODE ASSAY Average increase in elongation over Condensation product that of controls* (per cent) Mesityl oxide 18 48 Diacetone alcohol 1,133 Triacetonediol 1,549 Phorone * Experiment ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2231386a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    On the role of crystal imperfections in photographic sensitivity (1954)
    Springer
    The European physical journal 138 (1954), S. 381-393 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The role of crystal imperfections in the formation of the latent image in large crystals of silver bromide has now been established by experimental work. The internal latent image is formed by the separation of silver along dislocation lines associated with strained regions of the crystal and with the boundaries of the polyhedral substructure. Chemical sensitizing agents are adsorbed and react preferentially at the surfaces of regions of strain and imperfection in the crystals. Non-reacting sensitizing molecules are also adsorbed in the same regions because of the higher density of kink sites associated with them. This means that the chemical sensitizers are concentrated at the surfaces of strained and imperfect parts of the crystal where positive holes and electrons liberated during exposure are most likely to be trapped. It is postulated that the trapping of the holes occurs before that of the electrons and leaves the surface with a positive charge due to an excess of silver ions. The bromine atoms formed by the trapping of the holes by bromide ions occupying kink sites combine with atoms or molecules of sensitizers. The silver ions ultimately attach themselves to nuclei consisting of one or two metallic atoms and these positively charged aggregates then combine with the electrons. In this way larger aggregates are formed which may become positively charged in equilibrium with the silver ions of the crystal and act as development centres. With some molecular sensitizers, it is possible that a surface latent image is produced by the internal rearrangement of the molecule without the actual liberation of electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01340684
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Selective Substoichiometric separation of fluoride by solvent extraction into chloroform with triphenyl-tin chloride (1984)
    Springer
    Microchimica acta 83 (1984), S. 243-250 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die selektive Abtrennung von Fluorid aus 50% igem Dimethylsulfoxid in Wasser durch substöchiometrische Verdrängungsreaktion mit Triphenylzinnchlorid und Extraktion in Chloroform wurde ausgearbeitet. Auf ±2,5% genaue substöchiometrische Trennungen von Fluorid in Gegenwart von Bromid, Chlorid, Jodid, Nitrat, Rhodanid oder Sulfat wurden durchgeführt. Die Anwendbarkeit des Verfahrens für die radiochemische Abtrennung bei der Aktivierungsanalyse wurde an Beispielen von bestrahltem Ammoniumfluorid, Fluorwasserstoffsäure und mit18F markiertem Natrium-bzw. Magnesiumfluorid gezeigt. Die Ergebnisse der quantitativen Bestimmung der Radioisotop-Verdünnung zeigen einen Fehler von ±2,1% für Fluoridmengen von 0,76±0,044 mg.
    Notes: Summary A unique method has been developed for the selective separation of fluoride from a 50% dimethylsulfoxide (DMSO) aqueous phase via Substoichiometric replacement reaction with triphenyl-tin chloride and extraction into chloroform. Precise (±2.5%) Substoichiometric separations of fluoride in the presence of bromide, chloride, iodide, nitrate, thiocyanate, or sulfate have been accomplished. Applicability of the method for radionuclide separations in activation analysis is demonstrated via the examples of irradiated ammonium fluoride, hydrofluoric acid, and18F isotope labeled sodium and magnesium fluorides. Results for quantitative radioisotope dilution determinations show an error of ±2.1% for a fluoride level of 0.761±0.044 mg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01207072
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Microscale homogeneity and compositional profiling of borosilicate glass materials (1983)
    Springer
    Microchimica acta 81 (1983), S. 253-261 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Homogenität von Borsilikatglas sowie die Verteilung des Bors wurde unter Verwendung thermischer Neutronenaktivierung und Alphateilchenzählung untersucht. Im Gegensatz zu den meisten anderen Borbestimmungsmethoden wurden große Probenbereiche mikroskopisch charakterisiert. Die Eignung dieses Verfahrens wurde sowohl für kleine Probenmengen erwiesen wie auch für optische Fasern.
    Notes: Summary The microscale compositional homogeneity and distribution of boron as a major constituent of borosilicate glass has been examined using thermal neutron activation with alpha track counting. In contrast to most other methods capable of detecting boron, large sample areas have been microscopically characterized. Applicability to compositional profiling of boron within small samples has been demonstrated as well with examples of optical fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01497616
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Determination of boron in glass by the nuclear track technique (1985)
    Springer
    Microchimica acta 87 (1985), S. 65-75 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Determination of Boron in Glass by the Nuclear Track Technique The nuclear track technique using the10B(nα)7Li reaction, has been applied to determine boron in concentration ranges (1.59 to 7.75%) ordinarily considered high for nuclear determinations. Factors limiting the overall precision of the method and restricting the linear dependence of track density on boron concentration are examined. Boron alpha track densities are used to construct planar profiles of boron distribution within the surface region of bulk glass and CVD films. Calibration curves for quantitative lateral profiling of surfaces are constructed and show the selective corrosion of borosilicate glass surface resulting in boron depletion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01201986
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Brassins—a New Family of Plant Hormones from Rape Pollen (1970)
    [s.l.] : Nature Publishing Group
    Nature 225 (1970), S. 1065-1066 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The chromatographic methods we used in purifying hormones from rape pollen were as follows: 1.5 g of finely ground air-dried rape pollen was extracted with 18 ml. of anhydrous ether for 30 min at room temperature. Decantate from this extraction was reduced in volume (40 C) and the concentrate was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2251065a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Critical currents near 10 6 A cm -2 at 77 K in neutron-irradiated single-crystal YBa 2 Cu 3 O 7 (1989)
    [s.l.] : Nature Publishing Group
    Nature 342 (1989), S. 55-57 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Thin films, in which we expect both different defects and a far higher defect density, can sustain supercurrents of 〉4x 105Acm~2 at 77 K and 20 kOe, with low dissipation levels4 (measured by magnetization). Until now, such high values have not been reported in bulk YBa2Cu3O7. Various methods of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/342055a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Modification of central sweating drive at the periphery (1971)
    Springer
    International journal of biometeorology 15 (1971), S. 268-272 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01803910
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Control of local and total sweating during exercise transients (1971)
    Springer
    International journal of biometeorology 15 (1971), S. 201-206 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01803898
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Behavioral implications of mechanistic ecology (1973)
    Springer
    Oecologia 13 (1973), S. 1-54 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mechanistic principles from engineering, meteorology, and soil physics are integrated with ecology and physiology to develop models for prediction of animal behavior. The Mojave Desert biome and the desert iguana are used to illustrate these principles. A transient energy balance model for animals in an outdoor environment is presented. The concepts and relationships have been tested in a wind tunnel, in a simulated desert, and in the field. The animal model requires anatomical information and knowledge of the thermoregulatory responses of the animal. The micrometeorological model requires only basic meteorological parameters and two soil physical properties as inputs. Tests of the model in the field show agreement between predicted and measured temperatures above and below the surface of about 2 to 3°C. The animal and micrometeorological models are combined to predict daily and seasonal activity patterns, available times for predator-prey interaction, and daily, seasonal and annual requirements for food and water. It is shown that food, water and the thermal environment can limit animal activity, and furthermore, the controlling limit changes with season. Actual observations of activity patterns and our predictions show close agreement, in many cases, and pose intriguing questions in those situations where agreement does not exist. This type of modeling can be used to further study predator-prey interactions, to study how changes in the environment might affect animal behavior, and to answer other important ecological and physiological questions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379617
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...