Search results for "LABOR"
showing 10 items of 3876 documents
Immune-neuroendocrine biology of invertebrates: a collection of methods
2008
In the last decade there has been a considerable increase of interest towards the elucidation of several aspects of invertebrate biology, including immunity and neuroendocrinology. However, due to the difficulties connected to the great variety of morphology and adaptations displayed by invertebrates, and also in consideration of the number of techniques that are applied in the various laboratories, research on invertebrates still suffers from hampering that have been substantially overcome in vertebrate models, especially in mammals. The aim of this Technical Report is to provide the reader a useful list of well-established morphological and morpho-functional protocols in order to facilita…
Experimental Investigation for Local Tank Inflow Model
2014
In the present paper the effect of private roof tanks and of the float valve characteristics on apparent losses due to water meter errors was investigated via an experimental study. The tests were carried out at the Environmental Hydraulic Laboratory of the University of Enna (Italy), on a high-density polyethylene (HDPE 100 PN16) looped distribution network. The experimental results showed that network pressure plays an important role in the characterisation of the floating ball valve emitter law, but the tank operating condition is the most relevant aspect to be considered mainly for water meter error evaluation. (C) 2014 The Authors. Published by Elsevier Ltd.
Experimental Evidence of Leaks in Elastic Pipes
2016
Several studies have been carried out in recent decades to establish a relationship between total head and leaks. In literature, the leakage governing equations have been analysed in light of pipe materials, water head, leak dimension or shape. Most of these contributions questioned the classical Torricelli equation, demonstrating through experimental evidence that the classical orifice law can give unsatisfactory results. Nevertheless, starting from the Torricelli equation, other exponential or linear governing equations have been proposed as mathematical models able to reproduce the leakages in water distribution systems (WDSs). To investigate the validity of the proposed governing equati…
Fabric evolution and the related swelling behaviour of a sand/bentonite mixture upon hydro-chemo-mechanical loadings
2015
This experimental study investigates the swelling behaviour of an 80/20 sand/bentonite mixture and the associated fabric evolution under different hydro-chemo-mechanical loadings. Free and confined swelling tests are performed on specimens compacted to different dry densities and wetted with different pore fluids. Controlled suction confined swelling tests are performed to determine the suction–swelling pressure relationship for two different densities. An extensive microstructural characterisation is performed to relate the observed swelling behaviour to the evolution of the different pore networks during wetting. Based on the microstructural analysis, an expression is proposed to determi…
An experimental and constitutive investigation on the chemo-mechanical behaviour of a clay
2013
Engineering issues for which the understanding of the chemo-mechanical behaviour of soils is relevant include wellbore stability problems, the salinification of groundwater, and nuclear waste storage. However, despite the vast number of situations in which couplings between chemistry and mechanics occur, the available constitutive models rely on limited experimental evidence. This paper presents the results of an experimental programme on the chemo-mechanical behaviour of a non-swelling illite. The osmotic suction is controlled through the ion concentration of sodium chloride in the pore water. Stress paths include mechanical loading at a constant osmotic suction, and an increasing osmotic …
Durability of calcarenitic hypogea in the underground cultural heritage of Palermo (Sicily)
2011
The paper deals with the stability conditions of hypogea, several hundred m 2 wide, dating from the Punic period to the XIX century, dug out of the calcarenitic table that makes up the bedrock of the Plain of Palermo in the Fossa della Garofala. This work concerns the influence that the shape of the hypogea and the characteristics of the lithotypes wields on the instability and decay phenomena taking place, by mean of laboratory tests on the calcarenite and parametric numerical models. The comparison between the numerical models and the actual instability phenomena validated the use of the empirical formula of Hoeck to the mechanical characterization of complex structured rock-mass in soft …
Hydromechanical behaviour of a volcanic ash
2013
This paper presents experimental analysis and numerical modelling aimed at improved understanding and prediction of the hydromechanical behaviour of volcanic ash at various states of saturation. Results from a comprehensive experimental programme are presented in order to characterise the response of the material in terms of matric suction and confining stress changes. The evolution of the yield stress at different suction levels has been quantified. The volumetric response with suction variations allowed the analysis of the collapse-upon-wetting behaviour. Water retention and permeability are also addressed. Tests results are used to calibrate a constitutive model based on the effective s…
Inner Areas between theories and practices. An ongoing laboratory
2022
The contribution proposes a reflection on the laboratories that are being formed in inner areas, and in which universities and researchers play a central role both from a technical point of view and in the advancement of theoretical reflection. The article is structured in four parts: it starts with a framework on inner areas as a place of fragility and opportunity, it moves on to the laboratory dimension that is triggered in the relationship with institutions, such as the university. It concludes with a reflection on the rooting dimension that the laboratory engenders in a territory.
Técnicas de cultivo de la vid y elaboración del vino y del aguardiente en el "Camp de Morvedre" a fines del siglo XVII
1988
EL ARTICULO ANALIZA LAS DIFERENTES LABORES AGRARIAS QUE RECIBEN LAS VIDES DE UNA GRAN EXPLOTACION DEPENDIENTE DEL MONASTERIO DE EL PUIG ENTRE 1671 Y 1691 BASANDOSE EN LOS LIBROS DE CONTABILIDAD. SE ESTUDIA TAMBIEN EL PROCESO DE ELABORACION DEL VINO Y AGUARDIENTE Y EL Destino de la producción. La explotación se caracteriza por un atento cuidado dentro de una técnica tradicional, pero no excesivamente atrasada. El vino se vende en partidas importantes dentro del año agrícola, y únicamente si es malo o se acumulan excedentes se opta por destilarlo.
Maternal Employment and Happiness: The Effect of Non-Participation and Part-Time Employment on Mothers' Life Satisfaction
2009
"In contrast to unemployment, the effect of non-participation and parttime employment on subjective well-being has much less frequently been the subject of economists' investigations. In Germany, many women with dependent children are involuntarily out of the labor force or in part-time employment because of family constraints (e.g., due to lack of available and appropriate childcare). Using data from the German Socio-Economic Panel (SOEP) Study, this paper analyzes the impact of involuntary familyrelated non-participation and part-time employment on mothers' life satisfaction. Controlling for unobserved individual fixed effects, I find that both the pecuniary effects (foregone earnings) an…