1,722,046 research outputs found
Robust surface roughness indices and morphological interpretation
Full text linkGeostatistical-based image/surface texture indices based on variogram (Atkison and Lewis, 2000; Herzfeld and
Higginson, 1996; Trevisani et al., 2012) and on its robust variant MAD (median absolute differences, Trevisani
and Rocca, 2015) offer powerful tools for the analysis and interpretation of surface morphology (potentially not
limited to solid earth). In particular, the proposed robust index (Trevisani and Rocca, 2015) with its implementation
based on local kernels permits the derivation of a wide set of robust and customizable geomorphometric indices
capable to outline specific aspects of surface texture. The stability of MAD in presence of signal noise and abrupt
changes in spatial variability is well suited for the analysis of high-resolution digital terrain models. Moreover, the
implementation of MAD by means of a pixel-centered perspective based on local kernels, with some analogies to
the local binary pattern approach (Lucieer and Stein, 2005; Ojala et al., 2002), permits to create custom roughness
indices capable to outline different aspects of surface roughness (Grohmann et al., 2011; Smith, 2015). In the
proposed poster, some potentialities of the new indices in the context of geomorphometry and landscape analysis
will be presented. At same time, challenges and future developments related to the proposed indices will be
outlined.
Atkinson, P.M., Lewis, P., 2000. Geostatistical classification for remote sensing: an introduction. Computers & Geosciences 26, 361-371.
Grohmann, C.H., Smith, M.J., Riccomini, C., 2011. Multiscale Analysis of Topographic Surface Roughness in the
Midland Valley, Scotland. IEEE Transactions on Geoscience and Remote Sensing 49, 1220-1213.
Herzfeld, U.C., Higginson, C.A., 1996. Automated geostatistical seafloor classification - Principles, parameters,
feature vectors, and discrimination criteria. Computers and Geosciences, 22 (1), pp. 35-52.
Lucieer, A., Stein, A., 2005. Texture-based landform segmentation of LiDAR imagery. International Journal of
Applied Earth Observation and Geoinformation 6, 261–270.
Ojala, T., Pietikäinen, M. & Mäenpää, T. 2002. "Multiresolution gray-scale and rotation invariant texture
classification with local binary patterns", IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.
24, no. 7, pp. 971-987.
Smith, M.W. 2014. "Roughness in the Earth Sciences", Earth-Science Reviews, vol. 136, pp. 202-225.
Trevisani, S., Cavalli, M. & Marchi, L. 2012. "Surface texture analysis of a high-resolution DTM: Interpreting an
alpine basin", Geomorphology, vol. 161-162, pp. 26-39.
Trevisani, S., Rocca, M. 2015. MAD: robust image texture analysis for applications in high resolution geomorphometry. Comput. Geosci. 81, 78–92. doi:10.1016/j.cageo.2015.04.003
Pathophysiological and histomorphological evaluation of polyacryloylmorpholine vs polyethylene glycol modified superoxide dismutase in a rat model of ischaemia/reperfusion injury
No full textInt J Artif Organs. 1996 Dec;19(12):730-4.
Pathophysiological and histomorphological evaluation of polyacryloylmorpholine vs polyethylene glycol modified superoxide dismutase in a rat model of ischaemia/reperfusion injury.
Rocca M, Giavaresi G, Caliceti P, Veronese FM, Giardino R.
SourceDepartment of Experimental Surgery, Istituto di Ricerca Codivilla-Putti I.O.R. and Surgical Pathophysiology, Medical School, University of Bologna, Italy.
Abstract
Twenty Wistar rats were divided into two groups. Both underwent acute ischaemia followed by reperfusion of the left hind limb. The first group was a control group while the second was treated with PAcM-SOD. The survival percentage of the limb after 10 days was 30% for the first group and 70% for the second. Neither linear regression nor correlation were found between groups as far as the survival percentage of the limb after 10 days and reperfusion pmO2 data were concerned. After ten days the histomorphological analysis was significant regarding the fibre diameter and the percentage of central located nuclei in the specimens of PAcM-SOD treated limbs compared to normal limbs, but not when compared to the muscular fibres of the control group. Comparing these results with others obtained with native SOD and monomethoxypoly(ethylene glycol) modified SOD (mPEG-SOD) used in the same experimental model, we can conclude that the clinical and morphological results were better using mPEG-SOD, and that PAcM-SOD does have a protective effect on ischaemic muscle damage, although it is not as effective as mPEG-SOD in preventing ischaemia/reperfusion injury
Health and well-being in indoor work environments: A review of literature
No full textDuring the design and realization processes of an indoor work environment there is the need to guarantee to the future occupants adequate health and wellbeing conditions. Both conditions are strictly related to the human perception of the environment, and depends on four basic factors: thermal environment, lighting, acoustics, and indoor air quality. Such factors are related both to the Occupational Health and Safety and to the Indoor Environmental Quality that represent complementary aspects, but they are characterized by two different approaches. The human exposure to the hazardous conditions is governed by national and international Directives where the limit values for each agent are indicated. The exposure to hazardous agents is tackled according to pass/fail criteria. However, the fulfilment of these limits ensures safe working conditions but not the achievement of comfort conditions. The perception of comfort is a long studied by the scientific community that has analysed the relation between the perception of comfort and the environmental conditions. In this case the approach is qualitative with the use of indices of performance. In this paper the complexity of the relationship between occupant comfort and well-being is discussed. The Author explore the existing literature on the risk for human health and on the Indoor Environmental Quality in order to create a framework of the state of art of these two different but strictly connected aspects
Gli uomini della rivoluzione. La formazione dell'élite politica democratica nella Repubblica romana del 1849
Full text linkLa tesi propone un'analisi prosopografica dell'Assemblea Costituente eletta a Roma nel febbraio del 1849. Nel contesto del '48 italiano, l'Assemblea romana, eletta a suffragio universale maschile, si fece protagonista di un evento storico di grande rilevanza per quanto effimero nei suoi risvolti successivi, ossia la proclamazione della repubblica a Roma e la consegunte decadenza del potere temporale del papa. In tal senso risulta di particolare interesse guardare i percorsi di vita degli uomini che sedettero all'interno dell'aula romana, così come la loro formazione culturale e le motivazioni personali e ideologiche che li giudarono nell'attività legislativa e costituente, all'interno dell'Assemblea, durante i mesi della Repubblica
Sensitivity to uncertainty and scalarization in robust multiobjective optimization: an overview with application to mean-variance portfolio optimization
Full text linkRobust optimization is proving to be a fruitful tool to study problems with uncertain data. In this paper we deal with the minmax aproach to robust multiobjective optimization. We survey the main features of this problem with particular reference to results concerning linear scalarization and sensitivity of optimal values with respect to changes in the uncertainty set. Furthermore we prove results concerning sensitivity of optimal solutions with respect to changes in the uncertainty set. Finally we apply the presented results to mean-variance portfolio optimization
Human Response to the Indoor Environment a Collection of Literature Models
No full textThe Indoor Environmental Quality is today one of the topics of greatest interest. In the scientific community there is awareness that it is not enough to create buildings with high energy savings, but it is also necessary to guarantee high levels of comfort. However, an appropriate evaluation of the actual perception of occupants in the indoor environment is still rather difficult today. The aim of this work is to provide a framework on the human body's sensation and perception mechanisms and to collect human responses to the four main environmental factors, in order to describe how the human body is stimulated by each factor
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Set optimization of set-valued risk measures
No full textA new approach to optimizing or hedging a portfolio of financial instruments to reduce risk is presented. Central to this approach are concepts and tools of set-optimization theory. It focuses on the problem of minimizing set-valued risk measures applied to portfolios. We present sufficient conditions for the existence of solutions of a set-valued risk minimization problem under some semi-continuity assumption. The methodology is applied to the optimization of set-valued Value at Risk and Average Value at Risk. Two examples at the end illustrate various features of the theoretical construction, among them the geometry of the image sets
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