Search results for " Macro"

Compost Amendment Impact on Soil Physical Quality Estimated from Hysteretic Water Retention Curve

2022

Capacity-based indicators of soil physical quality (SPQ) and pore distribution parameters were proposed to assess the effects of compost amendment but their determination was limited to desorption water retention experiments. This study also considered the pore size distribution obtained from adsorption experiments to establish the effectiveness of compost amendment in modifying the physical and hydrological attributes of a sandy loam soil. Repacked soil samples with different compost to soil ratios, r, were subjected to a wetting–drying cycle, and the water retention data were fit to the van Genuchten model to obtain the pore volume distribution functions. The soil bulk density was m…

Dis-misure e dis-valori del danno all'ambiente fluviale: un approccio socio-sistemico

2013

Si espone qui la sperimentazione di un metodo di analisi e valutazione del danno ispirato all’approccio sociologico di N. Nuhmann (1990), che definisce l’ambiente per differenza rispetto ai processi comunicativi che informano il sistema sociale e quindi il danno ambientale come difetto della comunicazione tra sub-sistemi. In questa logica la valutazione del risarcimento è stata condotta con riferimento al rapporto verticale tra unità inquinanti e supporto naturale e orizzontale tra i diversi sub-sistemi che comunicano “sull’ambiente”. Il caso studiato riguarda le immissioni di inquinanti in un bacino idrico siciliano da tempo sotto osservazione anche da parte della Comunità Europea a causa …

Fish introductions and light modulate food web fluxes in tropical streams : a whole-ecosystem experimental approach

2016

Decades of ecological study have demonstrated the importance of top-down and bottom-up controls on food webs, yet few studies within this context have quantified the magnitude of energy and material fluxes at the whole-ecosystem scale. We examined top-down and bottom-up effects on food web fluxes using a field experiment that manipulated the presence of a consumer, the Trinidadian guppy Poecilia reticulata, and the production of basal resources by thinning the riparian forest canopy to increase incident light. To gauge the effects of these reach-scale manipulations on food web fluxes, we used a nitrogen (15N) stable isotope tracer to compare basal resource treatments (thinned canopy vs. con…

Effect of two distinct implant macro-designs on the osseointegration of bicortically installed implants in two topographic sites. A histomorphometric…

2019

Antecedentes científicos y objetivos de estudio: El uso de implantes dentales como alternativa para la rehabilitación oral ha demostrado su eficacia y mostrando altas tasas de supervivencia. Un aspecto clave de la osteointegración del implante dental está relacionado con la obtención de una estabilidad primaria adecuada, asegurada por el enclavamiento mecánico entre el tejido óseo y la interfaz del implante, la cual depende en parte de la geometría del implante, la rugosidad de la superficie y la técnica quirúrgica para la preparación del lecho implantario. Varios factores están involucrados en la interacción entre la superficie del implante y el hueso nativo circundante durante la osteoint…

Perspectives on variation in species richness : area, energy and habitat heterogeneity

2011

Valutazione di specie macroterme da tappeto erboso su suoli a diversa tessitura.

2011

Thermoelectric devices and supercapacitors based on nanostructured semiconducting polymers for energy production and storage

2017

Más de dos terceras partes de la energía generada por las fuentes convencionales se pierden como calor. Recuperar esas pérdidas de energía puede ayudar a crear una forma más eficiente de producir energía para el desarrollo sostenible de nuestra sociedad. Mediante el uso de generadores termoeléctricos es posible producir energía a partir de gradientes de temperatura de tal manera que la termoelectricidad puede ser una buena estrategia para la recolección y recuperación de energía. La eficiencia termoeléctrica suele ser dada por la figura adimensional de mérito, ZT. Actualmente, los materiales inorgánicos se usan comúnmente en aplicaciones termoeléctricas, sin embargo presentan varias desvent…

Les théories de la gouvernance : de la gouvernance des entreprises à la gouvernance des systèmes nationaux

2006

(VF)L'objectif de cet article est de faire une synthèse des théories de la gouvernance. Dans la première partie sont présentées les théories micro de la gouvernance en opposant les théories cognitives aux théories diciplinaires. La seconde partie est dévolue aux théories macro de la gouvernance sur la base de la distinction entre les théories fondées sur l'appropriation de la rente organisationnelle et celles accordant un rôle dominant à la production. Cette synthèse met en évidence que la vision financière de la gouvernance n'est qu'un cas très particulier qui présente de nombreuses limites;(VA)The objective of this article is to make a survey of the different corporate governance theories…

Improving statistical classification methods and ecological status assessment for river macroinvertebrates

2016

Aquatic ecosystems are facing a growing number of human-induced stressors and the need to implement more biomonitoring to assess the ecological status of water bodies is eminent. This dissertation aims at providing tools to reduce the costs and improve the accuracy of freshwater benthic macroinvertebrate biomonitoring. To improve the cost-e ciency, we consider automated classi cation and develop a novel classi er suitable for complex macroinvertebrate image data. To enhance the accuracy of macroinvertebrate biomonitoring, we study the statistical properties of the Percent Model A nity index crucial to current Finnish biomonitoring and the factors a ecting these statistics. Finally, we perfo…

Numerical Simulations of the Flow Field of a Submerged Hydraulic Jump over Triangular Macroroughnesses

2021

The submerged hydraulic jump is a sudden change from the supercritical to subcritical flow, specified by strong turbulence, air entrainment and energy loss. Despite recent studies, hydraulic jump characteristics in smooth and rough beds, the turbulence, the mean velocity and the flow patterns in the cavity region of a submerged hydraulic jump in the rough beds, especially in the case of triangular macroroughnesses, are not completely understood. The objective of this paper was to numerically investigate via the FLOW-3D model the effects of triangular macroroughnesses on the characteristics of submerged jump, including the longitudinal profile of streamlines, flow patterns in the cavity regi…