Search results for "Servo"

Phytoplankton dynamics and structure: a comparative analysis in natural and man-made water bodies of different trophic state

2000

Previous investigations on Sicilian man made lakes suggested that physical factors, along with the specific morphology and hydrology of the water body, are important in selecting phytoplankton species. In particular, the variations of the zmix/zeu ratio due to the operational procedure to which reservoirs are generally subject were recognised as a trigger allowing the assemblage shift. To investigate if these variations may be considered analogous to those occurring in natural lakes as trophic state and phytoplankton biomass increase, causing a transparency decrease and a contraction of the euphotic depth, phytoplankton were collected in two natural water bodies, one mesotrophic (Lake Bivie…

the role of lipids in the pathogenesis of neuroHIV

2020

A critical comorbidity of HIV infection is HIV-associated neurocognitive disorders (HAND). Although combined antiretroviral therapy (cART) is an effective treatment in blocking systemic viral replication, it is unsuccessful in reducing the incidence of HAND. HIV CNS damage, in the current cART era, can be associated to the presence of latently HIV-infected cells including microglia/macrophages and a small population of astrocytes. This Ph.D. thesis focuses on identifying, localizing, and quantifying viral reservoirs using an improved staining and microscopy technique. Although in low amount, our data confirmed that microglia/macrophages and a small population of astrocytes are still infecte…

Caratterizzazione geofisica dell’acquifero idrotermale dell’area di Panza (Ischia)

2007

Gli obiettivi di questo lavoro sono quelli di ricostruire, con metodologie geofisiche integrate, le principali geometrie tettoniche ed idrogeologiche del territorio di Panza nell'isola di Ischia. La zona è stata scelta in quanto caratterizzata da un'intensa attività idrotermale e deformativa connessa con la presenza di un reservoir geotermico.

Geophysical study of the hydrothermal reservoir in the Panza area (Ischia, Italy)

2008

The aim of the work is the reconstruction of the main geometric pattern and the characterisation with geophysical parameters of geological structures lying at small and medium depths in an area of the Ischia island (Italy), where a sensible hydrothermal activity is present.

Predicting reservoir water volumes in the Mediterranean area by combining a data-driven approach with seasonal forecasts data

Mapping phycocyanin cells density of Planktothrix rubescens in freshwater reservoirs

2014

Advanced Formation Fluid Evaluation While Drilling with a New Heavy Gas Detector

2012

In this paper, a chromatograph which exploits the benefits of FID technology optimized for the high resolution detection of heavier hydrocarbon gas components is described. The components analyzed span from n-hexane to toluene. Flame Ionization Detector (FID) technology is not new to gas detection on the field, however it had never been applied to the detection of gases heavier than n-pentane. The instrumentation has been installed and run on a number of wells in different fields and countries, and it has operated as a complement of an advanced surface logging system for a period of two years. Unlike other technologies presently utilized for this scope, this system reduces dedicated equipme…

Monitoring displacements of an earthen dam using GNSS and remote sensing

2014

This paper shows the results of a scientific research in which a GNSS continuous monitoring system for earth-dam deformations has been developed, then, deformations have been related with reservoir water surface and level. The experiment was conducted near Bivona (Sicily, Italy), on the Castello dam (Magazzolo Lake). On the top of the dam three control points were placed and three GNSS permanent stations were installed. The three stations continuously transmitted data to the control centre of the University of Palermo. The former has been determined using freely available satellite data (specifically Landsat 7 SLC-Off) collected during the whole study period (DOYs 101 to 348 2011). Issues r…

Comparing biological classifications of freshwater phytoplankton: a case study from South China

2012

The use of ecological classification systems is becoming more and more widely used when studying phytoplankton. Grouping phytoplankton species into ecologically coherent groups allow to reduce redundancy and in this way, to handle a minor number of biological variables when investigating the ecological status of aquatic ecosystems. Three ecological classifications are mostly used when freshwater phytoplankton is studied: functional groups or coda, morpho-functional groups (MFGs) and morphology-based functional groups (MBFGs). In this study, these three ecological classifications were comparatively used along with two taxonomic classifications based on species and genera to analyse phytoplan…

Researches Regarding the Use of Fuzzy Controllers within CNC Feed Drives

2015

This paper presents some simulation based upon a dynamic model of a feed-drive within the structure of a CNC machine tool. A DC servomotor was considered as actuation device for the feed drive. For a given set of parameters for the position controller, two fuzzy types of fuzzy controllers were tested by means of simulation. The first fuzzy controller was a proportional one, with one input and one output, while the second one was a two variables one, with two inputs and one outputp.