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  • 1
    Electronic Resource
    Electronic Resource
    CRYSTALLOGRAPHIC DATA. 60. Pseudotropine (1952)
    s.l. : American Chemical Society
    Analytical chemistry 24 (1952), S. 1516-1517 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60069a050
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  • 2
    Electronic Resource
    Electronic Resource
    Charge collection and trapping in low-temperature silicon detectors (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8179-8186 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Charge collection efficiency measurements in silicon detectors at low temperature (T〈0.5 K) and low applied electric field (E=0.1–100 V/cm) were performed using a variety of high-purity, p-type silicon samples with room-temperature resistivity in the range 2–40 kΩ cm. Good charge collection under these conditions of low temperature and low electric field is necessary for background suppression, through the simultaneous measurement of phonons and ionization, in a very low event rate dark matter search or neutrino physics experiment. Charge loss due to trapping during drift is present in some samples, but the data suggest that another charge–loss mechanism is also important. We present results which indicate that, for 60 keV energy depositions, a significant fraction of the total charge loss by trapping occurs in the initial electron-hole cloud near the event location which may briefly act as a shielded, field-free region. In addition, measurements of the lateral size, transverse to the applied electric field, of the initial electron-hole cloud indicate large transverse diffusion lengths. At the lowest fields a lateral diameter on the order of 1 mm is found in a detector ∼5 mm thick. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362552
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  • 3
    Electronic Resource
    Electronic Resource
    Detection of single infrared, optical, and ultraviolet photons using superconducting transition edge sensors (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 735-737 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have demonstrated the use of superconducting transition edge sensors for the wide-band detection of individual photons from the mid infrared (IR), through the optical, and into the far ultraviolet (UV). These tungsten transition edge sensors are squares about 18 μm on a side and detect single photon events above a threshold of 0.3 eV (4 μm wavelength), with an energy resolution of 0.15 eV full width at half maximum, and with a risetime (falltime) of .5 μs (60 μs). The calibration data extend up to the UV cutoff of the fiber optic feed at 3.5 eV (350 nm). © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121984
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  • 4
    Electronic Resource
    Electronic Resource
    Use of magnetocrystalline anisotropy in spin-dependent tunneling (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1941-1943 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial growth techniques are used to impose in-plane magnetocrystalline anisotropy on a spin-polarized tunneling configuration. A Cu(100) buffer layer grown on a Si(100) substrate stabilizes epitaxial face-centered-cubic cobalt as one of the ferromagnetic electrodes. The negative magnetocrystalline constant of this metastable phase favors easy axes along Co 〈110〉 and, due to the single crystal nature of this layer, the coercivity is more than an order of magnitude larger than in the polycrystalline layers which form the second electrode. Our approach provides a way to access the high degree of spin polarization characteristic of the 3d transition metals. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124878
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  • 5
    Electronic Resource
    Electronic Resource
    Α comparison of alternative techniques for prediction of the fauna of running-water sites in Great Britain (1999)
    Oxford, UK : Blackwell Science, Ltd
    Freshwater biology 41 (1999), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Early versions of the river invertebrate prediction and classification system (RIVPACS) used TWINSPAN to classify reference sites based on the macro-invertebrate fauna, followed by multiple discriminant analysis (MDA) for prediction of the fauna to be expected at new sites from environmental variables. This paper examines some alternative methods for the initial site classification and a different technique for prediction.2. A data set of 410 sites from RIVPACS II was used for initial screening of seventeen alternative methods of site classification. Multiple discriminant analysis was used to predict classification group from environmental variables.3. Five of the classification–prediction systems which showed promise were developed further to facilitate prediction of taxa at species and at Biological Monitoring Working Party (BMWP) family level.4. The predictive capability of these new systems, plus RIVPACS II, was tested on an independent data set of 101 sites from locations throughout Great Britain.5. Differences between the methods were often marginal but two gave the most consistently reliable outputs: the original TWINSPAN method, and the ordination method semi-strong hybrid multidimensional scaling (SSH) followed by K-means clustering.6. Logistic regression, an alternative approach to prediction which does not require the prior development of a classification system, was also examined. Although its performance fell within the range offered by the other five systems tested, it conveyed no advantages over them.7. This study demonstrated that several different multivariate methods were suitable for developing a reliable system for predicting expected probability of occurrence of taxa. This is because the prediction system involves a weighted average smoothing across site groupings.8. Hence, the two most promising procedures for site classification, coupled to MDA, were both used in the exploratory analyses for RIVPACS III development, which utilized over 600 reference sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.1999.00376.x
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  • 6
    Electronic Resource
    Electronic Resource
    Malicious referees (1997)
    [s.l.] : Nature Publishing Group
    Nature 386 (1997), S. 319-319 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sir - Simon Wain-Hobson is by no means the first to express dissatisfaction with the refereeing of papers, and won't be the last (Nature 385,384; 1997). I second his proposal for reviews to be of a sufficient length - say 10 per cent of the paper's length for a rejection, 5 per cent otherwise? ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/386319d0
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  • 7
    Electronic Resource
    Electronic Resource
    Early Life Affects the Risk of Developing Breast Cancer (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 768 (1995), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1995.tb12152.x
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  • 8
    Electronic Resource
    Electronic Resource
    Breeding behaviour, relatedness and sex-investment ratios inLeptothorax tuberum Fabricius (1995)
    Springer
    Entomologia experimentalis et applicata 75 (1995), S. 165-174 
    Details
    ISSN: 1570-7458
    Keywords: Leptothorax tuberum ; relatedness ; sex-ratios ; isozymes ; Hymenoptera ; Formicidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ant speciesLeptothorax tuberum was shown to be predominantly monogynous. Queens usually mate once only but some nests may have a multiply-mated queen or are partially or serially polygynous. As expected from these results, within nest relatedness between workers and between workers and alate queens was found to be high. Almost fifty percent of nests had no nest queen which may indicate high queen mortality, queens leaving to found new nests or nest fragmentation. Observed female investment frequencies (IF o ) were not significantly different from those expected on the basis of worker control of sexual production and the relatedness estimates of workers to alate queens and workers to males calculated from isozyme data (IF E ). These values were not consistent with queen control. There was no evidence for lower IF o s in queenless nests nor for higher IF o s in larger nests classified by worker number. When nests were classified by sexual productivity, however, there was a strong rank correlation between productivity and female bias. This is the first study of an ant species to test observed IF against expected IF calculated without inferring between caste relatedness from worker data or pooling of data from different castes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382176
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  • 9
    Electronic Resource
    Electronic Resource
    Electrodes based on Magnéli phase titanium oxides: the properties and applications of Ebonex® materials (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 1021-1033 
    Details
    ISSN: 1572-8838
    Keywords: Magnéli phases ; substoichiometric ; conductive ; titanium oxides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Magnéli phases are a range of substoichiometric oxides of titanium of the general formula TinO2n−1, (where n is between 4 and 10) produced from high temperature reduction of titania in a hydrogen atmosphere. These blue/black ceramic materials exhibit a conductivity comparable to that of graphite and can be produced in a number of forms, such as tiles, rods, fibres, foams and powders. While these materials have been studied for many years, they have only recently received interest for use as ceramic electrode materials, commercially termed ‘Ebonex®’, and are beginning to challenge precious metal coated anodes for some applications in aggressive electrolytes. Other uses for these materials include electrowinning, electroplating, battery materials, impressed current cathodic protection anodes, electrochemical soil remediation, oxidation of organic wastes, flexible cable materials and electrophoresis. The scope of this review considers the structure and properties of Magnéli phase titanium oxide materials, together with their electrochemical behaviour and applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003469427858
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  • 10
    Electronic Resource
    Electronic Resource
    Agrin signals at the junction (1996)
    [s.l.] : Nature Publishing Group
    Nature 381 (1996), S. 478-479 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE ability of the nervous system to deal with the real world depends on rapid communication between its neurons at synaptic junctions. That communication involves the release of a chemical transmitter from one neuron and its binding to a receptor protein on the next, so the speed of transmission ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/381478a0
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