Representing a direct response of hydrologic, hydrogeologic, geomorphologic, and anthropic factor... more Representing a direct response of hydrologic, hydrogeologic, geomorphologic, and anthropic factors, the dynamic of river channels has a useful scientific and practical importance, especially for the regions where the rivers play the role of state border. This article presents a detailed analysis of the dynamic of the Prut River channel for the last 125 years, concerning a 26 km sector of the river, which correspond to Prisacani territorial (local) administrative unit (LAU 2 nd order), Iaşi County. This segment can be considered as a representative natural border between Romania and Republic of Moldavia along the middle Prut River course, downstream the Stânca-Costeşti anthropic lake. The work consisted in digitization of a large series topographic maps (1893-1894 edition at 1:50,000 scale, 1940 edition at 1:20,000 scale, the 1949, 1960 and 1985 editions at 1:25,000 scale), various remote sensing images: LANDSAT images for the 1990 and 2000 decades, SENTINEL 1A and 2A images for the year 2015 and 2016, LiDAR DEM (acquired in 2012), and Google Earth® high resolution optical satellite images collection. For the last two years, the channel dynamic was validated and completed using GPS measurements.
The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2015
This paper had been aiming to analyze salinated soils, of the area Osoi-Moreni from the village P... more This paper had been aiming to analyze salinated soils, of the area Osoi-Moreni from the village Prisacani, Iasi city from physical properties point of view of this salinated soils. For this research we had took soils from two places: the first place are currently cultivated with corn (Zea mays), and the second soil place came from an area of uncultivated, which has not suffered work agricultural about seven years. The methods for analysis of physical characteristics of saline soils are important research for the diagnosis, monitoring and quality control saline soils which are used in agricultural.
Overall objective of this project is mathematical modeling of diffusion processes, functional sta... more Overall objective of this project is mathematical modeling of diffusion processes, functional status and numerical methods development. This paper includes qualitative study to estimate the gas diffusion coefficient (DP/D0) in undisturbed soils. Based on empirical and numerical models of Penman [1940], Millington and Quirk [1960], Millington and Quirk [1961] and Moldrup [1999] has determined diffusion coefficient variation for different types of soil taken in the study. It was found that soil type, texture, structure, porosity, apparent density are the main factors influencing the diffusion and gas transport in porous media. The project conducted fundamental research on both general diffusion models and analysis models particulare major in science and engineering.
Hepatitis B antigen (HB Ag) titer and subtype were determined in blood samples obtained from 270 ... more Hepatitis B antigen (HB Ag) titer and subtype were determined in blood samples obtained from 270 HB Ag-positive acute viral hepatitis (AVH) patients, as well as in 100 HB Ag-positive blood donors. The percentage distribution of the HB Ag titer shows a shift towards lower titers in the case of "healthy carriers". In both AVH patients and blood donors the "ay" antigenic subtype was found to be predominant.
Annals of Valahia University of Targoviste, Geographical Series, 2018
In this paper is investigating correlation between land surface temperature and vegetation indice... more In this paper is investigating correlation between land surface temperature and vegetation indices (Normalized Difference Vegetation Index - NDVI, Enhanced Vegetation Index 2 - EVI2 and Modified Soil Adjusted Vegetation Index - MSAVI) using Landsat images for august, the warmest month, for study area. Iaşi county is considered as study area in this research. Study Area is geographically situated on latitude 46°48'N to 47°35'N and longitude 26°29'E to 28°07'E. Land surface temperature (LST) can be used to define the temperature distribution at local, regional and global scale. First use of LST was in climate change models. Also LST is use to define the problems associated with the environment. A Vegetation Indices (VI) is a spectral transformation what suppose spatial-temporal intercomparisons of terrestrial photosynthetic dynamics and canopy structural variations. Landsat5 TM, Landsat7 ETM+ and Landsat8 OLI, all data were used in this study for modeling. Landsat imag...
The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2016
The present study wants to highlight the influence it has compacting process on the variation of ... more The present study wants to highlight the influence it has compacting process on the variation of hydrophysical.properties of three types of soil In solving this unfavorable soil phenomenon this paper tries to noting the main effects exerted by the compaction process on the hydrophysical.properties distribution in time and space by applying laboratory methods for determining the physical and hydraulic properties of soils in Breazu and Dancu areas. Principal physical characteristics were determined: soil density, soil bulk density, texture and soil porosity. Hydraulic properties analyzed in order to mark the variation of water regime were: hydraulic conductivity (saturated and unsaturated) and soil suction. All these basic attributes of soil were determined in laboratory methods of applying wish traced internationally.
The ground control points (GCPs) are used in the process of indirect georeferencing the 15 Unmann... more The ground control points (GCPs) are used in the process of indirect georeferencing the 15 Unmanned Aerial Systems (UAS) images. A minimum of 3 ground control points (GCPs) is 16 required, but increasing the number of GCPs will lead to higher accuracy of the final results. The 17 aim of the study is to provide the answer to the question of how many ground control points are 18 necessary in order to derive high precision results. To obtain the results, an area of about 1 ha has 19 been photographed with a low-cost UAS, namely DJI Phantom 3 Standard at two different heights: 20 28 m and 35 m above ground, the camera being oriented in nadiral position and a number of 50 21 ground control points were measured using a total station. In the first and the second scenario, the 22 UAS images were processed using the Pix4D Mapper Pro software and 3DF Zephyr respectively, 23 by performing a full bundle adjustment process, the number being gradually increased from 3 GCPs 24 to 40. The third tes...
The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2016
This paper intends to highlight the main causes and effects attributable to nature negative proce... more This paper intends to highlight the main causes and effects attributable to nature negative process called: compaction or settlement in some cases depending on the area in which researching takes place. In solving this unfavorable soil phenomenon, in the last half of the twentieth century the focus was on developing new techniques and technologies used in preventing and combating the stocky from natural causes or human land referred in this paper. Thus in this context was reported one of the methods to prevent and to combat this factor such as deep loosening. This process applied to improve influenced in a manner most favorable physicochemical properties and soil hydraulic.
Present Environment and Sustainable Development, 2017
Lidar has provided significant benefits for forest development and engineering operations and pro... more Lidar has provided significant benefits for forest development and engineering operations and provides a good means to collect information on forest stands. A common analysis using LiDAR data computes the CHM as a difference between DSM and DTM, create a DTM from the ground returns and a DSM from the first returns and subtract the two rasters, but how exactly are generated the DTM and the DSM. Irregular height variations, called data pits are present in the CHM and appear when the first Lidar return is far below the canopy. The purpose of this study is an approach that computes the CHM directly from height-normalized LiDAR points.
Representing a direct response of hydrologic, hydrogeologic, geomorphologic, and anthropic factor... more Representing a direct response of hydrologic, hydrogeologic, geomorphologic, and anthropic factors, the dynamic of river channels has a useful scientific and practical importance, especially for the regions where the rivers play the role of state border. This article presents a detailed analysis of the dynamic of the Prut River channel for the last 125 years, concerning a 26 km sector of the river, which correspond to Prisacani territorial (local) administrative unit (LAU 2 nd order), Iaşi County. This segment can be considered as a representative natural border between Romania and Republic of Moldavia along the middle Prut River course, downstream the Stânca-Costeşti anthropic lake. The work consisted in digitization of a large series topographic maps (1893-1894 edition at 1:50,000 scale, 1940 edition at 1:20,000 scale, the 1949, 1960 and 1985 editions at 1:25,000 scale), various remote sensing images: LANDSAT images for the 1990 and 2000 decades, SENTINEL 1A and 2A images for the year 2015 and 2016, LiDAR DEM (acquired in 2012), and Google Earth® high resolution optical satellite images collection. For the last two years, the channel dynamic was validated and completed using GPS measurements.
The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2015
This paper had been aiming to analyze salinated soils, of the area Osoi-Moreni from the village P... more This paper had been aiming to analyze salinated soils, of the area Osoi-Moreni from the village Prisacani, Iasi city from physical properties point of view of this salinated soils. For this research we had took soils from two places: the first place are currently cultivated with corn (Zea mays), and the second soil place came from an area of uncultivated, which has not suffered work agricultural about seven years. The methods for analysis of physical characteristics of saline soils are important research for the diagnosis, monitoring and quality control saline soils which are used in agricultural.
Overall objective of this project is mathematical modeling of diffusion processes, functional sta... more Overall objective of this project is mathematical modeling of diffusion processes, functional status and numerical methods development. This paper includes qualitative study to estimate the gas diffusion coefficient (DP/D0) in undisturbed soils. Based on empirical and numerical models of Penman [1940], Millington and Quirk [1960], Millington and Quirk [1961] and Moldrup [1999] has determined diffusion coefficient variation for different types of soil taken in the study. It was found that soil type, texture, structure, porosity, apparent density are the main factors influencing the diffusion and gas transport in porous media. The project conducted fundamental research on both general diffusion models and analysis models particulare major in science and engineering.
Hepatitis B antigen (HB Ag) titer and subtype were determined in blood samples obtained from 270 ... more Hepatitis B antigen (HB Ag) titer and subtype were determined in blood samples obtained from 270 HB Ag-positive acute viral hepatitis (AVH) patients, as well as in 100 HB Ag-positive blood donors. The percentage distribution of the HB Ag titer shows a shift towards lower titers in the case of "healthy carriers". In both AVH patients and blood donors the "ay" antigenic subtype was found to be predominant.
Annals of Valahia University of Targoviste, Geographical Series, 2018
In this paper is investigating correlation between land surface temperature and vegetation indice... more In this paper is investigating correlation between land surface temperature and vegetation indices (Normalized Difference Vegetation Index - NDVI, Enhanced Vegetation Index 2 - EVI2 and Modified Soil Adjusted Vegetation Index - MSAVI) using Landsat images for august, the warmest month, for study area. Iaşi county is considered as study area in this research. Study Area is geographically situated on latitude 46°48'N to 47°35'N and longitude 26°29'E to 28°07'E. Land surface temperature (LST) can be used to define the temperature distribution at local, regional and global scale. First use of LST was in climate change models. Also LST is use to define the problems associated with the environment. A Vegetation Indices (VI) is a spectral transformation what suppose spatial-temporal intercomparisons of terrestrial photosynthetic dynamics and canopy structural variations. Landsat5 TM, Landsat7 ETM+ and Landsat8 OLI, all data were used in this study for modeling. Landsat imag...
The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2016
The present study wants to highlight the influence it has compacting process on the variation of ... more The present study wants to highlight the influence it has compacting process on the variation of hydrophysical.properties of three types of soil In solving this unfavorable soil phenomenon this paper tries to noting the main effects exerted by the compaction process on the hydrophysical.properties distribution in time and space by applying laboratory methods for determining the physical and hydraulic properties of soils in Breazu and Dancu areas. Principal physical characteristics were determined: soil density, soil bulk density, texture and soil porosity. Hydraulic properties analyzed in order to mark the variation of water regime were: hydraulic conductivity (saturated and unsaturated) and soil suction. All these basic attributes of soil were determined in laboratory methods of applying wish traced internationally.
The ground control points (GCPs) are used in the process of indirect georeferencing the 15 Unmann... more The ground control points (GCPs) are used in the process of indirect georeferencing the 15 Unmanned Aerial Systems (UAS) images. A minimum of 3 ground control points (GCPs) is 16 required, but increasing the number of GCPs will lead to higher accuracy of the final results. The 17 aim of the study is to provide the answer to the question of how many ground control points are 18 necessary in order to derive high precision results. To obtain the results, an area of about 1 ha has 19 been photographed with a low-cost UAS, namely DJI Phantom 3 Standard at two different heights: 20 28 m and 35 m above ground, the camera being oriented in nadiral position and a number of 50 21 ground control points were measured using a total station. In the first and the second scenario, the 22 UAS images were processed using the Pix4D Mapper Pro software and 3DF Zephyr respectively, 23 by performing a full bundle adjustment process, the number being gradually increased from 3 GCPs 24 to 40. The third tes...
The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2016
This paper intends to highlight the main causes and effects attributable to nature negative proce... more This paper intends to highlight the main causes and effects attributable to nature negative process called: compaction or settlement in some cases depending on the area in which researching takes place. In solving this unfavorable soil phenomenon, in the last half of the twentieth century the focus was on developing new techniques and technologies used in preventing and combating the stocky from natural causes or human land referred in this paper. Thus in this context was reported one of the methods to prevent and to combat this factor such as deep loosening. This process applied to improve influenced in a manner most favorable physicochemical properties and soil hydraulic.
Present Environment and Sustainable Development, 2017
Lidar has provided significant benefits for forest development and engineering operations and pro... more Lidar has provided significant benefits for forest development and engineering operations and provides a good means to collect information on forest stands. A common analysis using LiDAR data computes the CHM as a difference between DSM and DTM, create a DTM from the ground returns and a DSM from the first returns and subtract the two rasters, but how exactly are generated the DTM and the DSM. Irregular height variations, called data pits are present in the CHM and appear when the first Lidar return is far below the canopy. The purpose of this study is an approach that computes the CHM directly from height-normalized LiDAR points.
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