Modelling the nonlinear static response of a 2-storey URM benchmark case study: comparison among different modelling strategies using two- and three-dimensional elements     

Cannizzaro  Francesco  Castellazzi  Giovanni  Grillanda  Nicola  Pant&#;  Bartolomeo  Petracca  Massimo 《Bulletin of Earthquake Engineering》2022,20(4):2085-2114

Bulletin of Earthquake Engineering - This paper aims at comparing the use of different software environments for the study of a simple unreinforced masonry building through nonlinear static...  相似文献   

On the effects of pore water pressure buildup and dissipation on the seismic performance of a propped r.c. diaphragm wall in sand     

Oliynyk  Kateryna  Pontani  Nicola  Tamagnini  Claudio 《Acta Geotechnica》2021,16(5):1547-1573

Acta Geotechnica - The study concerns the analysis of a retaining structure composed by a couple of r.c. diaphragm walls propped at the crest in loose and medium-dense, variably saturated sand...  相似文献   

Characterization of mesostasis regions in lunar basalts: Understanding late‐stage melt evolution and its influence on apatite formation          下载免费PDF全文

Nicola J. Potts  Romain Tartèse  Mahesh Anand  Wim van Westrenen  Alexandra A. Griffiths  Thomas J. Barrett  Ian A. Franchi 《Meteoritics & planetary science》2016,51(9):1555-1575

Recent studies geared toward understanding the volatile abundances of the lunar interior have focused on the volatile‐bearing accessory mineral apatite. Translating measurements of volatile abundances in lunar apatite into the volatile inventory of the silicate melts from which they crystallized, and ultimately of the mantle source regions of lunar magmas, however, has proved more difficult than initially thought. In this contribution, we report a detailed characterization of mesostasis regions in four Apollo mare basalts (10044, 12064, 15058, and 70035) in order to ascertain the compositions of the melts from which apatite crystallized. The texture, modal mineralogy, and reconstructed bulk composition of these mesostasis regions vary greatly within and between samples. There is no clear relationship between bulk‐rock basaltic composition and that of bulk‐mesostasis regions, indicating that bulk‐rock composition may have little influence on mesostasis compositions. The development of individual melt pockets, combined with the occurrence of silicate liquid immiscibility, exerts greater control on the composition and texture of mesostasis regions. In general, the reconstructed late‐stage lunar melts have roughly andesitic to dacitic compositions with low alkali contents, displaying much higher SiO₂ abundances than the bulk compositions of their host magmatic rocks. Relevant partition coefficients for apatite‐melt volatile partitioning under lunar conditions should, therefore, be derived from experiments conducted using intermediate compositions instead of compositions representing mare basalts.  相似文献   

The Maoxian landslide as seen from space: detecting precursors of failure with Sentinel-1 data   总被引：1，自引：0，他引：1  

Emanuele Intrieri  Federico Raspini  Alfio Fumagalli  Ping Lu  Sara Del Conte  Paolo Farina  Jacopo Allievi  Alessandro Ferretti  Nicola Casagli 《Landslides》2018,15(1):123-133

Post-event Interferometric Synthetic Aperture Radar (InSAR) analysis on a stack of 45 C-band SAR images acquired by the ESA Sentinel-1 satellites from 9 October 2014 to 19 June 2017 allowed the identification of a clear precursory deformation signal for the Maoxian landslide (Mao County, Sichuan Province, China). The landslide occurred in the early morning of 24 June 2017 and killed more than 100 people in the village of Xinmo. Sentinel-1 images have been processed through an advanced multi-interferogram analysis capable of maximising the density of measurement points, generating ground deformation maps and displacement time series for an area of 460 km² straddling the Minjiang River and the Songping Gully. InSAR data clearly show the precursors of the slope failure in the source area of the Maoxian landslide, with a maximum displacement rate detected of 27 mm/year along the line of sight of the satellite. Deformation time series of measurement points identified within the main scarp of the landslide exhibit an acceleration starting from April 2017. A detailed time series analysis leads to the classification of different deformation behaviours. The Fukuzono method for forecasting the time of failure appear to be applicable to the displacement data exhibiting progressive acceleration. Results suggest that satellite radar data, systematically acquired over large areas with short revisiting time, could be used not only as a tool for mapping unstable areas, but also for landslide monitoring, at least for some typologies of sliding phenomena.  相似文献   

Reply to discussion on “Guidelines on the use of inverse velocity method as a tool for setting alarm thresholds and forecasting landslides and structure collapses” by F. Bozzano,P. Mazzanti,and S. Moretto     

Tommaso Carlà  Emanuele Intrieri  Federico Di Traglia  Teresa Nolesini  Giovanni Gigli  Nicola Casagli 《Landslides》2018,15(7):1443-1444

■■■The paper “Discussion to: Guidelines on the use of inverse velocity method as a tool for setting alarm thresholds and forecasting landslides and structure collapses by T. Carlà, E. Intrieri, F. Di Traglia, T. Nolesini, G. Gigli and N. Casagli” by Bozzano et al. brings forward new considerations on an issue of extreme concern in landslide risk management. To this day, the ability to predict catastrophic landslide failures from slope surface displacements is a problem dictated more by practical constraints rather than by theoretical uncertainties. In this sense, the development of data interpretation practices is crucial. This short reply provides a few further insights with regard to this subject, also in the context of the recently published literature.  相似文献   

Phytoremediation of Pyrene Contaminated Soils by Different Plant Species     

Valeria D'Orazio  Alaà Ghanem  Nicola Senesi 《洁净——土壤、空气、水》2013,41(4):377-382

Polycyclic aromatic hydrocarbons (PAHs) present serious problems in the environment because they may affect negatively human health and alter native ecological communities. Phytoremediation has long been recognized as an efficient method of eliminating PAH pollutants from soil. A pot experiment was conducted in greenhouse conditions to investigate the capability of three plant species, Medicago sativa, Brassica napus, and Lolium perenne, to promote the degradation of pyrene by measuring their growth on pyrene‐contaminated soils. After 90 days, pyrene concentration in soils declined by 32, 30, and 28%, respectively, with M. sativa, B. napus, and L. perenne, whereas it decreased only by 18% in the control soil without plants. These results indicated that pyrene was successfully removed by plants used. In particular, M. sativa showed the highest capacity for pyrene dissipation in soil, whereas L. perenne was more efficient in limiting adverse effects of pyrene contamination. In addition, the contaminant pyrene was undetectable in shoots and roots of the three species, likely because plant roots can stimulate soil microbial biomass and oxygen transport to the rhizosphere, thus facilitating indirectly the degradation process of pyrene. Further studies are in progress to evaluate the possible adsorption of pyrene to soil organic matter.  相似文献   

Ruinon landslide (Valfurva, Italy) activity in relation to rainfall by means of GBInSAR monitoring     

Chiara Del Ventisette  Nicola Casagli  Joaquim Fortuny-Guasch  Dario Tarchi 《Landslides》2012,9(4):497-509

The active Ruinon rockslide is located on the left bank of the Frodolfo River valley (Valfurva, Italian Alps) and is developed on the Confinale deep-seated gravitational slope deformation. Ruinon landslide is a major hazard for valley inhabitants in that rapid movement might dam the stream and create a debris flow. The landslide is strongly controlled by preexisting structural features and is believed to have been triggered by postglacial debuttressing. Ground-based radar interferometry has been used to map surface deformation over time of the entire unstable zone of Ruinon landslide with high spatial resolution and at a very high temporal acquisition rate (about five images per hour). The activity of the landslide shows strong periodicity, with summer and autumn accelerations and winter deceleration. From a correlation between the landslide acceleration and a class of rainfall event, we deduce the specific rainfall conditions that accelerate the instability of the landslide area. The study results suggest an improved tool for early warning of events of potentially catastrophic landslide instability.  相似文献   

Thinking creative clusters beyond the city: People,places and networks   总被引：1，自引：0，他引：1  

David C. Harvey  Harriet Hawkins  Nicola J. Thomas 《Geoforum》2012,43(3):529-539

This paper develops an ethnographic study of a small rural based ‘creative cluster’, called Krowji, situated in the town of Redruth in West Cornwall, UK. The dominant geographies of creative industries research and policy in recent years have an acknowledged urban bias together with a focus on narratives of agglomeration. This paper sits alongside research that brings to the fore ‘other’ geographies of cultural production, and reflects an increasing interest in work on creativity in rural areas. Following work by Storper and Pratt, we explore Krowji’s complex interdependencies, investigating ‘the relations within, without and across the cluster’. We focus on the relationships between Krowji and its surrounding area together with the spatialities and temporalities of the relations that occur across and beyond the cluster. We address the dynamics and durability of relations formed within the cluster also paying attention to their disconnections. In offering this analysis we develop a valuable counterpoint to the urban bias of much work on creative clusters and we contribute to work that is looking more closely at the temporalities and spatialities of cultural production. Further, we point towards the value of ethnographical research on the creative industries.  相似文献   

Reconstructing temporal changes and prediction of channel evolution in a large Alpine river: the Tagliamento river,Italy     

Luca Ziliani  Nicola Surian 《Aquatic Sciences - Research Across Boundaries》2016,78(1):83-94

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Characterization of Clay‐ and Silt‐Sized Fractions and Corresponding Humic Acids Along a Terra Rossa Soil Profile          下载免费PDF全文

Gennaro Brunetti  Giuseppe Natale Mezzapesa  Andreina Traversa  Eleonora Bonifacio  Karam Farrag  Nicola Senesi  Valeria D'Orazio 《洁净——土壤、空气、水》2016,44(10):1375-1384

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