Search results for "SLI"

Modeling the hydrological and mechanical effect of roots on shallow landslides

2016

This study proposes a new methodology for estimating the additional shear strength (or cohesion) exerted by vegetation roots on slope stability analysis within a coupled hydrological-stability model. The mechanical root cohesion is estimated within a Fiber Bundle Model framework that allows for the evaluation of the root strength as a function of stress-strain relationships of populations of fibers. The use of such model requires the knowledge of the root architecture. A branching topology model based on Leonardo's rule is developed, providing an estimation of the amount of roots and the distribution of diameters with depth. The proposed methodology has been implemented into an existing dis…

Gaismas leksika Homēra eposā “Īliada”

2016

Bakalaura darbā “Gaismas leksika Homēra Īliādā’’ tika izpētīta gaismu apzīmējošā leksika ar mērķi noteikt tās lietojuma funkcijas. Gaismas leksika ir vārdu kopums, kuru izmantojot kā māksliniecisko izteiksmes līdzekļu veidošanas rīku, Homērs panāk “Īliādā” aprakstīto ainu un priekšmetu atainojumu ilustrācijas. Gaisma ir vērtīgs parādību avots, no kura smeļoties leksiku ir iespējams aprakstīt lietas tiešajā un pārnestajā nozīmē, piemēram, izteikt rakstura izcilību, ārējā izskata skaistumu, priekšmetu skaistumu, emociju izpausmes. Pētījuma gaitā tika izpētīts gaismas leksiski semantiskais lauks grieķu valodā, ir nosauktas tās lietojuma pamatfunkcijas, kā arī ir izpētīti mūsdienu leksikoloģija…

Global Linear Stability Analysis of the Flow Around a Superhydrophobic Circular Cylinder

2016

International audience; Over the last few years, superhydrophobic (SH) surfaces have been receiving an increasing attention in many scientific areas by virtue of their ability to enhance flow slip past solid walls and reduce the skin-friction drag. In the present study, a global linear-stability analysis is employed to investigate the influence of the SH-induced slip velocity on the primary instability of the 2D flow past a circular cylinder. The flow regions playing the role of 'wavemaker' are identified by considering the structural sensitivity of the unstable mode, thus highlighting the effect of slip on the global instability of the considered flow. In addition, a sensitivity analysis t…

Politics of Humanitarianism: The Ahmadiyya and the Provision of Social Welfare

2020

Ahmadi Muslims have combined local contributions and financial support from overseas to support various development projects since the 1920s when they started their mission activities in West Africa. The chapter outlines contemporary social welfare activities of the Ahmadiyya Muslim Community in Ghana and Burkina Faso. Humanitarian aid provided by the Ahmadiyya Muslim Community and its NGO Humanity First is one of the issues favouring public recognition as well as interreligious dialogue to which the Ahmadis are equally strongly committed. Most of the donations for Humanity First come from members of the Ahmadiyya community, as zakat or sadaqa donations. Public recognition is particularly i…

Non invasive imaging of coronary arteries with 64-slice CT and 1.5T MRI: challenging invasive techniques

2007

Non-invasive coronary artery imaging challenges any diagnostic modality, because of the complex and tortuous anatomy and cardiac contraction and respiration. Therefore, non-invasive coronary imaging requires high spatial and temporal resolution. Our purpose is to discuss the feasible applications in coronary imaging of Magnetic Resonance Imaging and Multi-slice Computed Tomography (MSCT). Focus will be devoted to potential indications and clinical impact of MSCT because of the fast development and the important results recently reported, in particular with the recent introduction of 64-slice equipments. MSCT of the coronary arteries is a promising imaging modality for the assessment of coro…

Synthesis of polymer nanogels by electro-Fenton process: investigation of the effect of main operation parameters

2017

Recently, electro-Fenton (EF) process has been shown as a promising, facile, effective, low cost and environmentally-friendly alternative for synthesizing polymer nanogels suitable as biocompatible nanocarriers for emerging biomedical applications. Here, the electrochemically-assisted modification of poly(vinylpyrrolidone) (PVP) by EF process was studied to assess the role of key operation parameters for a precise modulation of polymer crosslinking and its functionalization with [sbnd]COOH and succinimide groups. The dimensions of the nanogels, in terms of hydrodynamic radius (Rh) and weight-average molecular weight (Mw), can be tuned up by controlling the electrolysis time, current density…

The Landslide of Agrigento Hill (Sicily, Italy)

2018

This paper illustrated the geological, morphological and hydrogeological studies performed for the analysis and monitoring of the landslide involving the northern side of the hill of Agrigento (335 m a.s.l.) on which the ancient Cathedral was built during the 11th Century. The hill is made of a typical Plio-Pleistocene transgressive succession made of clays (M. Narbone formation), calcarenites, sands and clayey soils (Agrigento formation). The area has been unstable since 1315, involving both the little-welded, very porous and fractured calcarenitic sections (E-W) from Pleistocene and the clay layers interstratified within these sections. Since 1924, from time to time, various typologies of…

Parameter Uncertainty in Shallow Rainfall-triggered Landslide Modeling at Basin Scale: A Probabilistic Approach

2014

Abstract This study proposes a methodology to account for the uncertainty of hydrological and mechanical parameters in coupled distributed hydrological-stability models for shallow landslide assessment. A probabilistic approach was implemented in an existing eco-hydrological and landslide model by randomizing soil cohesion, friction angle and soil retention parameters. The model estimates the probability of failure through an assumed theoretical Factor of Safety (FS) distribution, conditioned on soil moisture content. The time-dependent and spatially distributed FS statistics are approximated by the First Order Second Moment (FOSM) method. The model was applied to the Rio Mameyes Basin, loc…

MODELING THE TERRAIN EVOLUTION AT BASIN SCALE: THE GEOMORPHIC COMPONENT OF TRIBS HYDROLOGICAL MODEL

2012

Accounting for soil parameter uncertainty in a physically based and distributed approach for rainfall-triggered landslides

2015

In this study we propose a probabilistic approach for coupled distributed hydrological-hillslope stability models that accounts for soil parameters uncertainty at basin scale. The geotechnical and soil retention curve parameters are treated as random variables across the basin and theoretical probability distributions of the Factor of Safety (FS) are estimated. The derived distributions are used to obtain the spatio-temporal dynamics of probability of failure, in terms of parameters uncertainty, conditioned to soil moisture dynamics. The framework has been implemented in the tRIBS-VEGGIE (Triangulated Irregular Network (TIN)-based Real-time Integrated Basin Simulator-VEGetation Generator fo…