Search results for "FOREST"

On the hidden significance of differing micro-sites on tree-ring based climate reconstructions

2015

Tree-ring chronologies are commonly extended back in time by combining samples from living trees with relict material preserved in man-made structures or natural archives (e.g. lakes). Although spatially close, these natural archives and living-tree-sites often comprise different micro-climates. Inhomogeneous growth conditions among these habitats, which may yield offsets in growth-rates, require caution in data processing. Here we assess species-specific growth dynamics in two micro-habitats and their potential effects on long chronologies by combining tree-ring data from different living-tree-sites with an “artificial” subfossil dataset. Well replicated (n > 80) Norway spruce (…

Rimboschimenti e uso energetico della biomassa forestale nei Monti Sicani (Sicilia occidentale)

2014

Nell’ottica di un utilizzo energetico sostenibile delle biomasse provenienti dalle utilizzazioni forestali è di fondamentale importanza conoscere la consistenza e le esigenze ecologiche delle formazioni forestali che caratterizzano il territorio regionale. In questo lavoro è illustrato uno studio sulla consistenza e sulle caratteristiche ecologiche e strutturali dei rimboschimenti presenti nel territorio dei Monti Sicani. L’analisi è finalizzata a quantificare la disponibilità di biomassa forestale residuale ottenibile dalla gestione sostenibile di tali popolamenti e valutare il possibile uso energetico. L’analisi è stata condotta sulla base dei dati disponibili per l’area di studio presso …

Sickness Absence at Work and Supporting Being Present At Work, Among Employees Working Different Shifts in the Forest Industry

2015

Objective: Shift work has negative effects on employee overall health, including sleep disorder, depressive symptoms, and cardiovascular and metabolic diseases. The association between shift work and the prevalence of sickness absence has been less studied. This study investigated sickness absence among employees working different work shift schedules in the forest industry. Method: This descriptive cross-sectional study used employee (N=636) data from forest industry sick-leave registers. The study population (n=280; women n=90 and men=189) worked five different shifts. Each of the five shifts was analyzed separately for sickness absence rate and the results were compared using independent…

Nonlinear Distribution Regression for Remote Sensing Applications

2020

In many remote sensing applications, one wants to estimate variables or parameters of interest from observations. When the target variable is available at a resolution that matches the remote sensing observations, standard algorithms, such as neural networks, random forests, or the Gaussian processes, are readily available to relate the two. However, we often encounter situations where the target variable is only available at the group level, i.e., collectively associated with a number of remotely sensed observations. This problem setting is known in statistics and machine learning as multiple instance learning (MIL) or distribution regression (DR). This article introduces a nonlinear (kern…

Testing steady-state analysis of single-ring and square pressure infiltrometer data

2016

Testing reliability of the saturated soil hydraulic conductivity, Ks, estimated by applying the steady-state single-ring (SR) model to the quasi steady-state infiltration rates obtained with a single-ring pressure infiltrometer (PI) increases confidence in the estimated Ks values. Determining a means to estimate Ks from infiltration data collected with a square infiltrometer allows the use of sources of different shapes. Using numerically simulated infiltration rates for six homogeneous soils ranging in texture from sand to silty clay loam, this investigation suggested an overall good performance of the SR model, with estimated Ks values differing by not more than 25% from the true values f…

Alterazioni delle caratteristiche fisico-chimiche e meccaniche dei paletti di castagno in ambiente mediterraneo

2014

Sistemazione dei bacini montani e difesa del suolo

2008

Attualità dell’idraulica agraria e delle sistemazioni idraulico-forestali al cambiare dei tempi. Scritti in onore di Ignazio Melisenda Giambertoni

2018

Experimental Study of the Stage-Discharge Relationship for an Upstream Inclined Grid with Longitudinal Bars

2013

AbstractIn this paper, the outflow process of an upstream inclined grid with longitudinal bars is studied by using the dimensional analysis and the incomplete self-similarity theory. Next, the theoretical analysis shows that a power equation can be used for establishing the stage-discharge equation. The coefficient and an exponent of the power equation depend on the slope angle and the void ratio. Finally, this new stage discharge is tested by using measurements obtained by laboratory runs conducted in this investigation.

Closure to “Experimental Study of the Stage-Discharge Relationship for an Upstream Inclined Grid with Longitudinal Bars” by C. Di Stefano and V. Ferro

2014

The discusser would like to thank the authors of the original paper for investigating the outflow process of an upstream inclined grid with longitudinal bars using the dimensional analysis and the incomplete self-similarity theory. The discusser, however, would like to add a few points. Using the theoretical analysis the authors of the original paper showed that a power equation can be used for establishing the stage-discharge equation of an upstream inclined grid with longitudinal bars. The authors of the original paper also showed that the coefficient and exponent of the power equation depend on the slope angle and the void ratio. They proposed a stage-discharge equation