Search results for "S1"
showing 10 items of 755 documents
WATER MASSES EXCHANGE THROUGH THE STRAIT OF SICILY DURING THE LAST DEGLACIAL PERIOD AND THE HOLOCENE
2022
The main goal of this thesis is to explore the inter-basin connection between the eastern and the western Mediterranean (E- and W-Med, respectively) during the last deglacial and Holocene periods (last 15 kyr). The thesis is based on the study of a sediment core recovered at the west flank of Sicily channel (W-Sicily), strategically located under the current path of the surface Atlantic waters and directly below the present-day hydrographic boundary layer between the Eastern Mediterranean Sourced Water (EMSW) and the Western Mediterranean Deep Water (WMDW). This key location allow to explore past changes in both surface and deep water exchange between the E and the W-Med. In this thesis, a …
RESEARCHES ON THE DIGESTERS AND REACTORS WHICH CAN BE USED IN A FARM SCALE BIOGAS PLANT
2014
In the general context of searching integrated system of renewable energy production, this paper present some researches on the reactors and the digesters, as a main part of a biogas plant at a farm scale. After we present the most used types of digesters, we also concentrated over the processes which take place into a digester, one of them being the removal of H2S from biogas (desulphurisation), which can be made by various methods, either biological or chemical, taking place inside or outside the digester. In the case of biological desulphurization outside the digester, we concentrate on the types of reactors which can be used in this case. Beside the well known types of reactors, we pres…
Deducing the stage-discharge relationship for contracted weirs by the outflow theory of Malcherek
2019
The aim of this paper was the deduction of a new stage-discharge relationship for a contracted weir, having a crest length less than the channel width, by using the Malcherek’s outflow theory. The average outflow velocity over the rectangular contracted weir was expressed in terms of the head over weir, the momentum correction coefficient and the ratio between the crest length and the channel width. This theoretically deduced stage-discharge formula was calibrated by measurements carried out for values of the ratio between the crest length and the channel width ranging from 0.3125 to 0.9375. In particular, a relationship to estimate the momentum correction coefficient for contracted weirs w…
Distributed optimal power flow for islanded microgrids: An application to the Smart Polygeneration Microgrid of the Genoa University
2016
In this work, the application of an original distributed optimal power flow method to test a microgrid in the Savona area, Italy is proposed. The microgrid shows different types of Distributed Energy Resources (DERs) and is connected to the main grid through a fixed power bus. Due to the high computational speed, the applied distributed Optimal Power Flow can be performed almost in real time, i.e. every 5 minutes or less. The operating solution found for generators, simply using local information, corresponds to a suboptimal condition with reduced losses, bus voltages and line currents within constrained intervals. The distributed optimization algorithm is iterative, but also fast. It is ba…
Ecological and economic indicators for the evaluation of almond (Prunus dulcis l.) orchard renewal in sicily
2020
Globally, almond production is experiencing a growing trend thanks to a strong interest in the health, gastronomic, and industrial properties that are linked to the fruits and their derivatives. After a constant and marked decline in the second half of the last century, the Mediterranean Basin is thoroughly reassessing this crop, which provides significant results with a modern orchard management. The opportunity determined by the transition from traditional to modern systems have increased the interest in evaluating the different environmental impacts of the two cultivation models that still coexist today. In this work, through the application of the Life Cycle Assessment (LCA) and an econ…
PROFITABILITY A SUBSYSTEM WITHIN THE GENERAL SYSTEM OF ECONOMIC EFFICIENCY FOR AGRICULTURAL EXPLOITATIONS
2013
Under market economy conditions purchasing profitability represents a rule for each and every market player. It represents an essential condition of the existence of economic units. Survival of the enterprise and assuring its profitability are “the first concerns of every skilled leader. They are valid in each and every moment, right from the enterprises foundation. Thus profitability is a tool for decision making regarding internal administration of the economic unit, as well as in relation to external partners. It is the synthetic expression of results of any nature, an index for decision making and entity behaviour.
PROFIT – THE ABSOLUTE EXPRESSION OF PROFITABILITY
2013
Profitability of an economic unit is expressed through a system of indicators, because "no index or economic category can reflect the total, perfect, complex reality of economic phenomena or processes. Each expresses a side of concrete, essential details (indexes), but a full one (economic category). This system of indexes for profitability is characterized by a higher degree of consolidation, of reflection of the economic-financial results. They must be correlated to the other indexes of economic efficiency from the various subsystems that constitute the factors which determine the actual amount of profit and the rate of return. Each indicator has a certain form of expression according to …
METHOD OF ANALYSIS FOR POPULATION LIMITATION OF THE LEPIDOPTERA PEST IN FRUITERS (LEPIDOPTERA: TORTRICIDAE) IN SIBIEL VILLAGE, SIBIU CITY IN CONDITIO…
2014
In the present work is described an experiment in Sibiel, made in an apple orchard of 1,50 ha surface, which was kept under observation in order to combat the Cydia pomonella L. pest. It was used a pheromone trap as a combat method, for the application of the plant treatments in time.
MANAGEMENT ECOSYSTEM IN DUMBRAVA SIBIULUI FOREST ON THE EVOLUTION OF SPECIES MACROLEPIDOPTERA SIBIU DURING THE YEARS 2000-2012
2014
It was studied the ecology and phenology, the flight periods of the Macrolepidoptera during the period 2000-20012 in the Natural Park „Dumbrava Sibiului”. The natural conditions and the specific features were mentioned in my previous papers (Stancă-Moise, 2000, 2002, 2003, 2004, 2007, 2010, 2011, 2012). There is no doubt that the appearance of the different species of Macrolepidoptera in different periods of time is in a direct relation with the succession of the climatic conditions. The flight periods express the biological specific feature of each species of Lepidoptera, being in direct connection with the activity of feeding and reproduction of imagos.
ANALYSIS OF TOURISTIC DEVELOPMENT POTENTIAL OF SOME NATURA 2000 SITES
2014
This paper performs the analysis of the tourism development potential of two sites in the Natura 2000 network. SWOT analysis concerning the potential of tourism development is made, indicating opportunities for lovers of ecotourism: visitors interested in bird species, visitors interested in flora and fauna. It also describes the potential development of tourism services under the concept of "slow tourism". It describes the possible forms of tourism that can develop in this area, presenting a positive or negative impact on the environment and describe the type of interested visitors. The paper describes the main objectives of tourism development that should be included in the local developm…