1,721,015 research outputs found
Shallow groundwater temperature distribution and heat pumps in the plain sector of Regione Piemonte (NW Italy)
No full textSpontaneous renal hematomas [Ematomi renali spontanei: Descrizione di 4 casi]
No full textSpontaneus renal and peritoneal hematomas are heavy clinical events and , even if rare, they need an early diagnosis in order to plan therapy. A spontaneus renal hematoma should be suspected in case of acute lumbar pain because in more than 60% of cases it is due to a neoplastic lesion
Groundwater heat pump systems diffusion and groundwater resources protection
Full text linkGeothermal Energy, being a clean and sustainable source of energy, is gaining importance worldwide due to various reasons. Geothermal power can be generated throughout the year on twenty four hour basis as it's not much dependent on ambient temperature and weather conditions. Recently there is an increased interest in exploitation of low enthalpy geothermal resources for other applications such as geothermal space heating and cooling for domestic, industrial and commercial applications.GroundWater Heat Pump systems (GWHPs) extract water from one or more wells, pass it through a heat exchanger or a heat pump, which either extracts heat from, or rejects heat, and discharge water back into the aquifer or nearby surface water.This reinjection disturbs the natural aquifer temperature, producing a local temperature anomalies (cold or heat plume) known as the thermal affected zone (TAZ).Moreover, it is important to know if the TAZ can interfere with downgradient pre-existing plants or subsurface infrastructure or with the plant itself (thermal feedback). It is then important to know, even before constructing a GWHP system, the future TAZ extent around the planned injection point.Due to these risks, the increasing number of GWHP systems enforces the need for new criteria to develop subsurface energy policies that allow planning their spatial distribution. To obtain these sustainability criteria, the results of different dedicated studies are here proposed, in order to optimize the design and operation of GWHP systems
Reliability of spring recession curve analysis as a function of the temporal resolution of the monitoring dataset
Full text linkMountain springs represent one of the largest and most precious sources of potable water in Italy, necessary to meet the water needs of the population. Optimizing the present and future management strategies of mountain groundwater resources has become increasingly necessary. The accuracy and frequency of the flow rate (Q) measurements determine and restrict the processes that can be studied using spring hydrograph and recession curve analysis. Therefore, to properly define mountain aquifers’ hydrogeological properties, it turns out important to highlight the variation of the error in the estimation of the hydrogeological parameters as the time interval of sampling varies. In this paper, recession curve analysis was performed on two different mountain springs (Spring 1 and Spring 2) of north-western Italy, firstly considering available 4-h resolution measuring data and subsequently by resampling data to simulate longer sampling intervals of 1, 3, 7, 15, and 30 days. The resulting distribution of errors introduced by longer acquisition intervals underlined how the percentage error increases with increasing acquisition interval. For obtaining an adequate estimation of mountain aquifer hydrodynamic parameters, in place of continuous hourly data, 1-day and 3-day sampling intervals with associated errors respectively lower than 5% and 10% were found to be valid
A Review of Groundwater Heat Pump Systems in the Italian Framework: Technological Potential and Environmental Limits
Full text linkFor new buildings in densely urbanised cities, groundwater heat pump systems (GWHPs) represent a concrete, effective solution for decarbonising existing energy systems. Environmental factors must be considered to limit the GWHP system’s impact on the subsurface. Particular attention must be given to the long-term sustainability of groundwater abstraction modalities and the development of a thermally affected zone around re-injection wells. Simplified solutions and numerical models have been applied to predict subsurface heat transport mechanisms; these simulations allow researchers to consider site-specific geological conditions, transient heat and groundwater flow regimes, and anisotropies in the subsurface media. This paper presents a comprehensive overview of the current research on GWHPs and discusses the benefits and limitations of their diffusion in Italy. The sources used provide information on and examples of the correct methodological approaches for depicting the induced variations while avoiding the overestimation or underestimation of the impact that GWHPs have on exploited aquifers
GSTOP: a new tool for 3D Gemophogical survey and mapping
Full text linkIn geological mapping activities, geomatics can facilitate data collection during field survey and avoid practical problems related to the transposition of these data onto maps for GIS production. The Solid True Orthophoto (STOP) can reduce these difficulties using a dedicated instrument developed by the Authors called GSTOP. It can run on laptops or tablets, managing a direct connection with low cost navigation sensors in real time, to define its location and attitude. The user can produce a 3D solid image in order to compare the effective scene to record notes and to acquire evidence. GSTOP has been used to produce a geomorphological map of the Rodoretto Valley (Germanasca Valley, NW Italy), reconstructing its Quaternary evolution
Improvement of dehydrogenation kinetics of LiBH4 dispersed on modified multi-walled carbon nanotubes
No full textHydrogen storage characteristics of magnesium impregnated on the porous channels of activated charcoal scaffold
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