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Articles by Carmen Leane NICOLESCU
Total Records ( 4 ) for Carmen Leane NICOLESCU
  Gabriel GORGHIU , Catalin RISTEA and Carmen Leane NICOLESCU
  The MEMDUR system has been created and developed with the aim to offer an image of the air pollution in the area of Targoviste city. A spatial database and a mathematical model represent the core structure of the system. The spatial database was designed in SQL Server. Using GeoMedia, the spatial entities were defined taking into account the global coordinate system. The data, collected from different sources, are imported into the GeoMedia workspace and then exported to SQL Server database, generating a geometric entity, automatically. The mathematical model provides an analyze of the pollution status for CO, NO, NO2, SO2 and PM10 dusts, comparing their values with the hourly maximum admitted concentrations. For establishing the areas were the level of pollution generated by the stationary pollution sources is at maximum level, the model incorporates source-related and meteorological factors. Once the pollutant concentration in the DTM points was determined, it is possible to show different forms of concentration distribution on the areas of interest. Spatial queries can be made between the areas with concentrations in a given interval and in the entities of interest. There is presented a simulation of a hypothetical situation of a pollution accident to demonstrate the model efficiency, the visual representation of the pollutant concentration and the used symbols, which show the movement gradient of the pollutant. The on-line web publishing system was performed using GeoMedia WebMap application. The system interface offers the possibility to open and consult the designed database and visualize a graphical representation of the area of interest and the technical attributes of the objects or events registered in the critical points.
  Carmen Leane NICOLESCU and Lavinia Claudia BURULEANU
  Using Lactobacillus acidophilus stains is a challenge in producing lactic acid fermented vegetable and fruit juices. There were analysed the correlation between the most important physico-chemical parameters of the substrate and the bacterial biomass accumulation in two vegetable and fruit juices. The data were collected during a 48 hour lactic acid fermentation using usually chemical and microbiological methods. There was analysed the correlation between the reducing sugar content and the lactic acid production, the correlation between the pH and lactic acid production, the correlation between the reducing sugar of the substrate and the microbial biomass accumulation and also between the lactic acid production and biomass accumulation. These correlations were analysed using simple regression on scatter plots. They were best fitted by the polynomial equation where the highest R2 were calculated. The two last correlations had large differences between the two experimental batches so that regression is not satisfactory to describe them. If all parameters were considered using the multiple regression, the correlation had a medium value because the cell multiplication of the bacteria Lactobacillus acidophilus in vegetable and fruit juices is influenced by many other environmental parameters. These had a large influence because juices are not the natural medium for this kind of lactic acid bacteria.
  Dorin CARSTOIU , Gabriel GORGHIU and Carmen Leane NICOLESCU
  A series of local and regional scale dispersion models that are used in the frame of the Air Pollution Forecast System are developed in Romania with the view to forecast the air pollution. Near the predictions, the models must perform retrospective analysis, public information and alerting (especially when the pollution degree exceeds the maximum allowed concentrations). The system is operational for any urban or rural area where an inventory of the emissions is realized. In those cases, the mathematical modeling considers into calculus the pollutants dispersion and estimates the pollutant concentrations at ground and distant levels in a strong relation to the sources characteristics, atmospheric conditions, physico-chemical transformations suffered by the pollutants in atmosphere and interaction with the land surface. An analysis of the pollution status is performed in Dambovita County for the most important pollutants with a major influence on population health (CO, NO, NO2, SO2 and PM10 dusts). The analysis is made by the MEMDUR management system, designed in the frame of the National Research project: “Sustainable Management System of Resources Used for Monitoring and Evaluating the Environmental Risks in Order to Prevent the Negative Effects and to Manage Crises Situations”. In this case, for determining the zones were the pollution level generated by the stationary pollution sources reaches the maximum values, a Gaussian mathematical model is used (Nicolescu et al., 2008). The model takes into account the source-related factors and the meteorological ones for estimating the pollutant concentration from the stationary sources, using an exponential equation (Abdel-Rahman, 2008). The wind speed represents the core parameter of the model due to its influence on the dispersion (Straja, 1994). But this model makes possible also to determine the ground level concentrations at any receptor point in the analyzed region. The distribution of the concentration becomes available by computing the corresponding values registered at various receptors and summarizing the recorded values.
  Gabriel GORGHIU , Carmen Leane NICOLESCU , Mihai BIZOI and Ana-Maria SUDUC
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