Search results for "MAZ"

Overland flow hydrodynamic characteristics in rough beds at low Reynolds numbers

2022

This paper considers overland flow resistance at low Reynolds numbers through analysis of experimental runs carried out using water only and water/glycerol mixtures. We first examined the power relationship between the Darcy–Weisbach friction factor f and the Reynolds number Re to obtain the values of the K coefficient and b exponent. These results confirmed the applicability of the values of b suggested in literature, while K required a specific calibration for laminar open-channel flows. The analysis revealed that transition from a laminar to turbulent flow regime for water only flows occurred at a threshold value of Re equal to 500 as described historically. The estimate of f by the powe…

Effect of a Heavy Rainstorm on the Surface Hydrodynamic Properties of a Sandy-Loam Soil

2022

Changes in surface-soil hydrodynamic properties associated with torrential natural rainstorms are largely unknown. This investigation aimed at verifying if the surface hydrodynamic properties of a sandy-loam soil varied due to the heavy rainfall event (130 mm in nearly three hours) that occurred in the summer of 2020 at Palermo (Italy) and also to establish if soil recovery processes occurred soon after the event. The soil of an orchard was sampled immediately before the rainstorm and a few days and 1.5 months later. The rainstorm determined a moderate decrease (by 1.8 times) of the saturated soil hydraulic conductivity, Ks, and an increase of its relative variability. In the subsequent wee…

A test of water pouring height and run intermittence effects on single-ring infiltration rates

2018

Assessing how the infiltration process depends on the water impact energy improves interpretation of hydrological processes. Impact energies vary with the height of water pouring; that is, the distance between the water delivery point and the soil surface. The effects of the height of water pouring on infiltration in an initially near saturated soil can be tested in the field by two repeated Beerkan infiltration runs separated by a short pause (30 min) and using both low (non-perturbing) and high (perturbing) heights of water application. The double two-stage Beerkan run methodology was applied in two soils. The infiltration rate at the end of the perturbing stage of the experiment was 0.2–…

Determining short-term changes in the hydraulic properties of a sandy-loam soil by a three-run infiltration experiment

2020

Soil structure-dependent parameters can vary rapidly as a consequence of perturbing events such as intense rainfall. Investigating their short-term changes is therefore essential to understand the general behaviour of a porous medium. The aim of this study is to gain insight into the effects of wetting, perturbation and recovery processes through different sequences of Beerkan infiltration experiments performed on a sandy-loam soil. Two different three-run infiltration experiments (LHL and LLL) were carried out by pouring water at low (L, non-perturbing) and high (H, perturbing) heights above the soil surface and at short time intervals (hours, days). The results demonstrate that the propos…

Water transmission properties of a sandy-loam soil estimated with Beerkan runs differing by the infiltration time criterion

2021

Abstract The Beerkan method consists of a ponded infiltration experiment from a single ring inserted a small depth into the soil. Fixed, small volumes of water are repeatedly poured into the ring to maintain a quasi-zero head on the soil surface. According to the standard Beerkan infiltration run, a new water volume is poured on the infiltration surface when the previously applied volume has completely infiltrated and the soil surface is entirely exposed to air (ta criterion). However, water could also be applied when the soil exposition to air begins (to criterion) or half the soil surface is exposed to air (tm criterion). The effect of the infiltration time criterion on determination of t…

Previous Training in the Water Maze

1999

It has been shown that acquisition rates in the water maze vary across strains of mice, although the differential effects of previous experience in this spatial task have been scarcely evaluated. The aim of the present study was to evaluate the effects of training in the water maze at an early age (2 months) in two strains of mice (NMRI and C57BL) using a longitudinal study. Mice with or without previous training were tested when they were 6 months, and retested when 10 months old. The results showed that trained NMRI mice performed better than all the other groups, both at test and retest, indicating that previous training had more beneficial effects in NMRI than in C57BL mice. These resul…

Uzvedības traucējumi mazināšanas pedagoģiskās iespējas 4-5 gadus veciem bērniem mācību procesā

2018

Kvalifikācijas darbs izstrādāts par tēmu: Uzvedības traucējumi mazināšanas pedagoģiskās iespējas 4-5 veciem bērniem mācību procesā. Pētījuma mērķis: analizēt pedagoģiskā iespējas uzvedības traucējumu mazināšanā mācību procesā pirmsskolā. Pētījuma teorētiskajā daļā tika raksturota un apkopota dažāda pedagoģiskā un psiholoģiskā literatūra par bērnu uzvedības problēmām, tās izcelsmes teorijām, klasifikāciju un rašanās iemesliem, izpausmes formām saistībā ar ģimenes un pirmsskolas vidi, kurā tiek vai netiek apmierinātas bērnu vajadzības. Praktiski ir pētīti un raksturoti pirmsskolas vecuma bērni grupā, ka arī veikts pedagoģiskais izmēģinājuma darbs par bērnu uzvedības traucējumu mazināšanas ies…

GEOMETRIC AND RADIOMETRIC ANALYSIS OF PAINTINGS

2010

The paper reports an overview of some experiences carried out by some Italian research groups (Politecnico di Milano, University of Palermo, Bruno Kessler Foundation in Trento) aimed to assess the conservation‟s state of some analysed paintings and provide useful information for further diagnostic applications. The activities were accomplished in interdisciplinary teams composed of photogrammetrists, surveyors, restorers and experts of non-destructive diagnostic techniques for Cultural Heritage. Two main aspects are considered: (i) the analysis of the radiometric contents using multispectral images and (ii) the 3D surveying for geometric deformation analysis by means of photogrammetry and l…

La crisi delle Università italiane: il Bilancio sociale può avere un ruolo per il suo superamento?

2012

Verso una nuova cultura di Bildung: l’approccio biografico-narrativo come metodologia formativa

2020

Teoria e prassi, azione e riflessione, oggetto e soggetto, cura d’altri e cura di sé, sono i pilastri di una pedagogia volta alla Bildung intesa come tensione spirituale dell’io e coscienza di una crescita interiore cui ogni uomo può e deve elevarsi alla sua vera condizione umana. Questo lavoro si divide in due parti: la prima parte è volta a delineare una ricostruzione storica del concetto di Bildung, soffermandosi principalmente sul senso e sul significato che Edith Stein ha offerto al mondo della pedagogia; nella seconda parte del lavoro, si vuole identificare l’importanza di adottare la tecnica riflessiva della narrazione autobiografica per far emergere la validità che essa possiede nel…