Florin Nedelcut | Universitatea Dunarea de Jos Galati (original) (raw)
Uploads
Papers by Florin Nedelcut
2021 International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea), 2021
Hereby we report on design of an aerial monitoring platform equipped with sensors for detection o... more Hereby we report on design of an aerial monitoring platform equipped with sensors for detection of specific contaminants, named AWISEM (Air-Water Innovative System for Environmental Monitoring). The AWISEM system is aimed to be a mobile aerial and aquatic vehicle which should contain: A) an aerial and aquatic mobile monitoring platform, with an innovative sustentation system, having the capability to fly and also to float in an aquatic environment; B) two distinct sets of sensors, based on CNT composites with high sensitivity for the monitoring of either aerial or aquatic contaminants. An important part of this work consists in producing and characterizing sensing membranes (thin layers) for two types of sensors able to detect contaminants such as ammonia - in air and nitrites - in water. These membranes are produced by matrix-assisted pulsed laser evaporation technique. The morphological investigations showed specific structures (“worm”-like, rods, grains) while EDX investigations revealed that all constitutive elements (C, O, Fe, W) of used compounds (CNT, C32H16FeN8, WO3) are present in the corresponding nanostructured layers.
Remote Sensing of Environment, 2018
Thanks to the improved spatial and temporal resolution of new generation Earth Observation missio... more Thanks to the improved spatial and temporal resolution of new generation Earth Observation missions, such as Landsat 8 and Sentinel-2, the capabilities demonstrated in the last decades by remote sensing in mapping land surface phenology of terrestrial biomes can now be tested in inland water systems. We assessed the capabilities of dense time series of medium resolution satellite data to deliver information about quantitative macrophyte phenology metrics, focusing on three temperate European shallow lakes with connected wetlands: Mantua lakes system (Italy) Lac de Grand-Lieu (France), and Fundu Mare Island (Romania). Macrophyte leaf area index (LAI) maps were derived from semi-empirical regression modelling based on the best performing spectral index, with an error level around 0.1 m 2 m-2. Phenology metrics computed from LAI time series using TIMESAT code were used to analyse macrophyte seasonal dynamics across the three study areas in terms of spatial patterns and species-dependent variability for the year 2015. These peculiar dynamicity patterns of autochthonous and allochthonous species were related to the environmental characteristics of each area in terms of ecological, hydrological and meteorological conditions. In addition, the influence of cloud cover thresholding, temporal resolution and missing acquisitions was assessed in terms of phenology timing metrics retrieval, thus providing quantitative information on the expected variability of TIMESAT outputs when time series with reduced resolution are used, i.e. if 16-day time revisit Landsat data were used for retrospective study of macrophyte phenology during the last three decades.
Ultrasonic flow meters, as all velocity or inference type devices, require an adequate flow strea... more Ultrasonic flow meters, as all velocity or inference type devices, require an adequate flow stream conditioning in order to assure an accurate performance. Typical flow conditioning consists of straightening the upstream and downstream of the measuring section. The upstream section usually contains a tube bundle, which allows for the upstream section to be reduced in length. This tube bundle serves to eliminate any swirl in the flow stream before reaching the meter, presenting a symmetrical velocity profile to the turbine rotor. Some ultrasonic flow meters may produce a non-uniform pulse output, which can prove a wide span of repeatability. For such cases where is a need to correct the velocity flow profiles which affect the robustness of the integration method, this research work tries to develop a mathematical modeling and simulation in MATLAB and Microsoft Excel, with the purpose to combine the individual acoustic path measurements into a full volumetric flow rate measurement pro...
2021 International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea)
Ultrasonic flow meters, as all velocity or inference type devices, require an adequate flow strea... more Ultrasonic flow meters, as all velocity or inference type devices, require an adequate flow stream conditioning in order to assure an accurate performance. Typical flow conditioning consists of straightening the upstream and downstream of the measuring section. The upstream section usually contains a tube bundle, which allows the upstream section to be reduced in length. This tube bundle serves to eliminate any swirl in the flow stream before reaching the meter, presenting a symmetrical velocity profile to the turbine rotor. Some ultrasonic flow meters may produce a non-uniform pulse output, which can prove a wide span of repeatability. For such cases where is a need to correct the velocity flow profiles which affect the robustness of the integration method, this research work tries to develop a mathematical modeling and simulation in MATLAB and Microsoft Excel, with the purpose to combine the individual acoustic path measurements into a full volumetric flow rate measurement procedu...
Remote Sensing of Environment
Thanks to the improved spatial and temporal resolution of new generation Earth Observation missio... more Thanks to the improved spatial and temporal resolution of new generation Earth Observation missions, such as Landsat 8 and Sentinel-2, the potential of remote sensing techniques in mapping land surface phenology of terrestrial biomes can now be tested in inland water systems. .
The research presented in this scientific paper investigates an adaptive seismic isolation system... more The research presented in this scientific paper investigates an adaptive seismic isolation system meant to protect building structures subjected to a variety of seismic ground motions. This scientific paper presents a solution that is adequate for the seismic isolation of small buildings, bridges or viaducts, having main dimension less than 10 meters. The solution proposed by the authors is one of a composed type. The isolation system consists of sliding isolation bearings in combination with fluid viscous damper devices. The results of the research have revealed a favorable characteristic of this isolation system. The proposed system is therefore capable of simultaneously limiting the response of both sliding base isolation system and superstructure, for a large variety of seismic ground motions.
In environmental monitoring, human presence is necessary in order to monitor, record and control ... more In environmental monitoring, human presence is necessary in order to monitor, record and control the evolution of environmental parameters, but, at the same time, is to be avoided, because it is a disturbing and possibly intrusive element. A solution to this challenging dilemma is to use autonomous or remote controlled mobile sensors, which, in its turn, leads to the use of unmanned aerial vehicles (UAVs), similar to those already developed and used in the military field. UAVs have unmatched qualities that make them the only effective solution in specialised tasks where human presence either is not necessary, or is not allowed. Although the civil applications of the UAVs were developed later than military ones, there is already a wide range of civil UAVs. Nowadays, they are used in scientific, emergency, governmental or commercial missions. The environmental monitoring missions are already performed by some UAVs meant for scientific or emergency missions. This work presents some cur...
In environmental monitoring, human presence is necessary in order to monitor, record and control ... more In environmental monitoring, human presence is necessary in order to monitor, record and control the evolution of environmental parameters, but, at the same time, is to be avoided, because it is a disturbing and possibly intrusive element. A solution to this challenging dilemma is to use autonomous or remote controlled mobile sensors, which, in its turn, leads to the use of unmanned aerial vehicles (UAVs), similar to those already developed and used in the military field. UAVs have unmatched qualities that make them the only effective solution in specialised tasks where human presence either is not necessary, or is not allowed. Although the civil applications of the UAVs were developed later than military ones, there is already a wide range of civil UAVs. Nowadays, they are used in scientific, emergency, governmental or commercial missions. The environmental monitoring missions are already performed by some UAVs meant for scientific or emergency missions. This work presents some cur...
2021 International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea), 2021
Hereby we report on design of an aerial monitoring platform equipped with sensors for detection o... more Hereby we report on design of an aerial monitoring platform equipped with sensors for detection of specific contaminants, named AWISEM (Air-Water Innovative System for Environmental Monitoring). The AWISEM system is aimed to be a mobile aerial and aquatic vehicle which should contain: A) an aerial and aquatic mobile monitoring platform, with an innovative sustentation system, having the capability to fly and also to float in an aquatic environment; B) two distinct sets of sensors, based on CNT composites with high sensitivity for the monitoring of either aerial or aquatic contaminants. An important part of this work consists in producing and characterizing sensing membranes (thin layers) for two types of sensors able to detect contaminants such as ammonia - in air and nitrites - in water. These membranes are produced by matrix-assisted pulsed laser evaporation technique. The morphological investigations showed specific structures (“worm”-like, rods, grains) while EDX investigations revealed that all constitutive elements (C, O, Fe, W) of used compounds (CNT, C32H16FeN8, WO3) are present in the corresponding nanostructured layers.
Remote Sensing of Environment, 2018
Thanks to the improved spatial and temporal resolution of new generation Earth Observation missio... more Thanks to the improved spatial and temporal resolution of new generation Earth Observation missions, such as Landsat 8 and Sentinel-2, the capabilities demonstrated in the last decades by remote sensing in mapping land surface phenology of terrestrial biomes can now be tested in inland water systems. We assessed the capabilities of dense time series of medium resolution satellite data to deliver information about quantitative macrophyte phenology metrics, focusing on three temperate European shallow lakes with connected wetlands: Mantua lakes system (Italy) Lac de Grand-Lieu (France), and Fundu Mare Island (Romania). Macrophyte leaf area index (LAI) maps were derived from semi-empirical regression modelling based on the best performing spectral index, with an error level around 0.1 m 2 m-2. Phenology metrics computed from LAI time series using TIMESAT code were used to analyse macrophyte seasonal dynamics across the three study areas in terms of spatial patterns and species-dependent variability for the year 2015. These peculiar dynamicity patterns of autochthonous and allochthonous species were related to the environmental characteristics of each area in terms of ecological, hydrological and meteorological conditions. In addition, the influence of cloud cover thresholding, temporal resolution and missing acquisitions was assessed in terms of phenology timing metrics retrieval, thus providing quantitative information on the expected variability of TIMESAT outputs when time series with reduced resolution are used, i.e. if 16-day time revisit Landsat data were used for retrospective study of macrophyte phenology during the last three decades.
Ultrasonic flow meters, as all velocity or inference type devices, require an adequate flow strea... more Ultrasonic flow meters, as all velocity or inference type devices, require an adequate flow stream conditioning in order to assure an accurate performance. Typical flow conditioning consists of straightening the upstream and downstream of the measuring section. The upstream section usually contains a tube bundle, which allows for the upstream section to be reduced in length. This tube bundle serves to eliminate any swirl in the flow stream before reaching the meter, presenting a symmetrical velocity profile to the turbine rotor. Some ultrasonic flow meters may produce a non-uniform pulse output, which can prove a wide span of repeatability. For such cases where is a need to correct the velocity flow profiles which affect the robustness of the integration method, this research work tries to develop a mathematical modeling and simulation in MATLAB and Microsoft Excel, with the purpose to combine the individual acoustic path measurements into a full volumetric flow rate measurement pro...
2021 International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea)
Ultrasonic flow meters, as all velocity or inference type devices, require an adequate flow strea... more Ultrasonic flow meters, as all velocity or inference type devices, require an adequate flow stream conditioning in order to assure an accurate performance. Typical flow conditioning consists of straightening the upstream and downstream of the measuring section. The upstream section usually contains a tube bundle, which allows the upstream section to be reduced in length. This tube bundle serves to eliminate any swirl in the flow stream before reaching the meter, presenting a symmetrical velocity profile to the turbine rotor. Some ultrasonic flow meters may produce a non-uniform pulse output, which can prove a wide span of repeatability. For such cases where is a need to correct the velocity flow profiles which affect the robustness of the integration method, this research work tries to develop a mathematical modeling and simulation in MATLAB and Microsoft Excel, with the purpose to combine the individual acoustic path measurements into a full volumetric flow rate measurement procedu...
Remote Sensing of Environment
Thanks to the improved spatial and temporal resolution of new generation Earth Observation missio... more Thanks to the improved spatial and temporal resolution of new generation Earth Observation missions, such as Landsat 8 and Sentinel-2, the potential of remote sensing techniques in mapping land surface phenology of terrestrial biomes can now be tested in inland water systems. .
The research presented in this scientific paper investigates an adaptive seismic isolation system... more The research presented in this scientific paper investigates an adaptive seismic isolation system meant to protect building structures subjected to a variety of seismic ground motions. This scientific paper presents a solution that is adequate for the seismic isolation of small buildings, bridges or viaducts, having main dimension less than 10 meters. The solution proposed by the authors is one of a composed type. The isolation system consists of sliding isolation bearings in combination with fluid viscous damper devices. The results of the research have revealed a favorable characteristic of this isolation system. The proposed system is therefore capable of simultaneously limiting the response of both sliding base isolation system and superstructure, for a large variety of seismic ground motions.
In environmental monitoring, human presence is necessary in order to monitor, record and control ... more In environmental monitoring, human presence is necessary in order to monitor, record and control the evolution of environmental parameters, but, at the same time, is to be avoided, because it is a disturbing and possibly intrusive element. A solution to this challenging dilemma is to use autonomous or remote controlled mobile sensors, which, in its turn, leads to the use of unmanned aerial vehicles (UAVs), similar to those already developed and used in the military field. UAVs have unmatched qualities that make them the only effective solution in specialised tasks where human presence either is not necessary, or is not allowed. Although the civil applications of the UAVs were developed later than military ones, there is already a wide range of civil UAVs. Nowadays, they are used in scientific, emergency, governmental or commercial missions. The environmental monitoring missions are already performed by some UAVs meant for scientific or emergency missions. This work presents some cur...
In environmental monitoring, human presence is necessary in order to monitor, record and control ... more In environmental monitoring, human presence is necessary in order to monitor, record and control the evolution of environmental parameters, but, at the same time, is to be avoided, because it is a disturbing and possibly intrusive element. A solution to this challenging dilemma is to use autonomous or remote controlled mobile sensors, which, in its turn, leads to the use of unmanned aerial vehicles (UAVs), similar to those already developed and used in the military field. UAVs have unmatched qualities that make them the only effective solution in specialised tasks where human presence either is not necessary, or is not allowed. Although the civil applications of the UAVs were developed later than military ones, there is already a wide range of civil UAVs. Nowadays, they are used in scientific, emergency, governmental or commercial missions. The environmental monitoring missions are already performed by some UAVs meant for scientific or emergency missions. This work presents some cur...