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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 93 (1994), S. 411-416 
    ISSN: 1434-6036
    Keywords: 74.70.V ; 74.72.-h ; 74.72.Bk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The desorption kinetics of the chain oxygen atoms in the YBa2Cu3O7−δ (YBCO) superconductor were studied using isothermal vacuum annealing (VA). The number of the O(1) atoms per unit cell in the crystal was measured at three temperatures of 390, 415, and 450°C for various annealing times. From these measurements it was found that at high temperatures the loss of the O(1) atoms from the YBCO is very rapid, and so, low annealing temperatures must be used in order to see the fine details of the desorption phenomena. When the log of the instantaneous O(1) occupancy vs. time was plotted, three distinct linear segments were obtained for each temperature. This, I think is an indication of the existence of multiple desorption processes. From the slopes of these lines, I have evaluated three free energies of activation to be 1.14(6), 1.45(3), and 1.91(13) eV. These results are explained in terms of oxygen ordering in the chains.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2012-07-24
    Description: Foot plantar pressure is the pressure field that acts between the foot and the support surface during everyday locomotor activities. Information derived from such pressure measures is important in gait and posture research for diagnosing lower limb problems, footwear design, sport biomechanics, injury prevention and other applications. This paper reviews foot plantar sensors characteristics as reported in the literature in addition to foot plantar pressure measurement systems applied to a variety of research problems. Strengths and limitations of current systems are discussed and a wireless foot plantar pressure system is proposed suitable for measuring high pressure distributions under the foot with high accuracy and reliability. The novel system is based on highly linear pressure sensors with no hysteresis.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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  • 3
    Publication Date: 2009-04-01
    Print ISSN: 0031-3203
    Electronic ISSN: 1873-5142
    Topics: Computer Science
    Published by Elsevier
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  • 4
    Publication Date: 2014-02-13
    Description: ABSTRACT The intention of this study was to identify a suitable Generalized Linear Model (GLM) for modelling multi-site daily rainfall in the Onkaparinga catchment in South Australia and to examine the suitability of the model for downscaling of General Circulation Model (GCM) rainfall projections. A GLM was applied and multi-site daily rainfall was downscaled using National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis datasets. Nineteen large-scale atmospheric and circulation variables were selected at first and these were eventually reduced, based on correlation with daily rainfall, to 10 final variables to be used in the model. First, logistic regression was used to identify the wet and dry days, then wet day rainfall was modelled using a gamma distribution. The model was fitted for a calibration period (1991–2010) and it was then validated over the period 1981–1990. Several summary statistics including mean, standard deviation, number of wet days, maximum rainfall amount and lag 1 and lag 2 autocorrelations were used to check the model performance. The 2.5th and 97.5th percentiles of the simulated rainfall statistics were plotted against the observed rainfall statistics and it was shown that most of the observed statistics were within these bounds. Area averaged and station wise monthly, seasonal and annual totals for observed and simulated rainfall were estimated and compared. The overall performance of the GLM to downscale rainfall was considered satisfactory. However, a few discrepancies were observed in different performance statistics. Parameterization of the model to capture the local convective variability of rainfall would increase the model performance. It was found overall that the GLM can be applied for downscaling of GCM rainfall projections for this catchment.
    Print ISSN: 0899-8418
    Electronic ISSN: 1097-0088
    Topics: Geosciences , Physics
    Published by Wiley
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  • 5
    Publication Date: 2014-03-15
    Description: ABSTRACT Rainfall is the key hydroclimatic variable that plays a vital role in the development of regional water management policies. Assessment of observed rainfall behaviour and its spatial and temporal variations are therefore important for climate change adaptation measures. This study assessed trends and step changes in observed annual and seasonal rainfalls across the South Australian region. More than 100 years of high-quality rainfall data from 53 rainfall stations were analyzed using robust statistical techniques. The results are presented according to the eight South Australian natural resource management regions. Increasing annual rainfall trends were observed for the Arid Lands, Alinytjara Wilinara and Adelaide and Mount Lofty Ranges regions whereas decreasing trends were found for the Murray Darling Basin, Eyre Peninsula and South East regions. Both upward and downward trends were identified in the Northern and Yorke region. Seasonally, austral spring and summer rainfalls exhibited increasing trends in most of the regions whereas autumn and winter rainfalls showed decreasing trends. Most of the rainfall step changes were observed to happen in the 1960s and 1970s. The study also includes a discussion on possible mechanisms of South Australian rainfall variability and changes that may have links to the observed trends and step changes.
    Print ISSN: 0899-8418
    Electronic ISSN: 1097-0088
    Topics: Geosciences , Physics
    Published by Wiley
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  • 6
    Publication Date: 2018-05-09
    Description: Sensors, Vol. 18, Pages 1468: Shoe-Insole Technology for Injury Prevention in Walking Sensors doi: 10.3390/s18051468 Authors: Hanatsu Nagano Rezaul K. Begg Impaired walking increases injury risk during locomotion, including falls-related acute injuries and overuse damage to lower limb joints. Gait impairments seriously restrict voluntary, habitual engagement in injury prevention activities, such as recreational walking and exercise. There is, therefore, an urgent need for technology-based interventions for gait disorders that are cost effective, willingly taken-up, and provide immediate positive effects on walking. Gait control using shoe-insoles has potential as an effective population-based intervention, and new sensor technologies will enhance the effectiveness of these devices. Shoe-insole modifications include: (i) ankle joint support for falls prevention; (ii) shock absorption by utilising lower-resilience materials at the heel; (iii) improving reaction speed by stimulating cutaneous receptors; and (iv) preserving dynamic balance via foot centre of pressure control. Using sensor technology, such as in-shoe pressure measurement and motion capture systems, gait can be precisely monitored, allowing us to visualise how shoe-insoles change walking patterns. In addition, in-shoe systems, such as pressure monitoring and inertial sensors, can be incorporated into the insole to monitor gait in real-time. Inertial sensors coupled with in-shoe foot pressure sensors and global positioning systems (GPS) could be used to monitor spatiotemporal parameters in real-time. Real-time, online data management will enable ‘big-data’ applications to everyday gait control characteristics.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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  • 7
    Publication Date: 2012-05-18
    Description: Rainfall events and inter-event spell properties were analysed in this study using observed daily rainfall sequences for Adelaide and Melbourne in Australia. First and higher order transitional probabilities of dry and wet days were also estimated. Various statistical moments of spells were estimated and compared between Adelaide and Melbourne. Six theoretical distributions were fitted to the dry and wet spells. These were geometric, compound geometric, generalized Pareto, logarithmic series, Polya and truncated negative binomial distributions. The probability of longer dry spells was found to be higher in Adelaide than in Melbourne. Mean dry spell length was found to be highest in summer, where 7 days and 5.5 days were observed in February in Adelaide and Melbourne respectively. Mean wet spell length was observed to be longer in Adelaide than in Melbourne during autumn and winter. The study revealed that dry and wet spells in Adelaide and Melbourne are best fitted by geometric and compound geometric distributions. The Polya distribution was also found to fit the Melbourne dry spell lengths and Adelaide wet spell lengths. The Implications of dry spell properties for urban water management (for example water sensitive urban design) are also discussed. Copyright © 2012 Royal Meteorological Society
    Print ISSN: 0899-8418
    Electronic ISSN: 1097-0088
    Topics: Geosciences , Physics
    Published by Wiley
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  • 8
    Publication Date: 2013-06-28
    Description: ABSTRACT Spatial and temporal characteristics of rainfall in the United Arab Emirates (UAE) were investigated. The region is divided into four climate zones (East Coast, Mountains, Gravel Plains and Desert Foreland) of distinguished rainfall distribution. The rainfall patterns, rainfall probability of occurrences, rainfall intensity-duration-frequency (IDF) relationship, probable maximum precipitation (PMP) and drought scenarios were investigated. Daily rainfall data from a network of stations across the UAE were used. Standard statistical techniques were applied for data analyses. The Gumbel, log Pearson, generalized extreme value, log normal, Wakeby and Weibull probability distributions were tested to fit extreme rainfalls. Both Gumbel and Weibull distributions were found adequate. Measures of dispersion and symmetry of rainfall patterns were found relatively high. The estimated PMP values were found highest in the East Coast region and lowest in the Gravel Plains region. Estimated drought severity index showed that the regions have similar trends of drought patterns over the years. The study is useful for sustainable water resources planning and management in the region.
    Print ISSN: 0899-8418
    Electronic ISSN: 1097-0088
    Topics: Geosciences , Physics
    Published by Wiley
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  • 9
    Publication Date: 2018-01-03
    Description: Langmuir DOI: 10.1021/acs.langmuir.7b02334
    Print ISSN: 0743-7463
    Electronic ISSN: 1520-5827
    Topics: Chemistry and Pharmacology
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  • 10
    Publication Date: 1994-07-01
    Print ISSN: 0921-4534
    Electronic ISSN: 1873-2143
    Topics: Physics
    Published by Elsevier
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