ISSN 2344 – 1283, ISSN CD-ROM 2344 – 1291, ISSN ONLINE 2344 – 1305, ISSN-L 2344 – 1283
 

Published in Journal of Young Scientist, Vol.I
Written by Gheorghe FLOREA, Mihai NISTOR, Robert VIRLAN

This paper presents the results of the research that were performed in the Laboratory of Reinforced Concrete, Faculty of Land Reclamation and Environmental Engineering. The studies are based on theoretical aspects of the concrete prism bending resistance determinations. Using static analysis, the formula for bending resistance was determined. In the laboratory, Tests were performed on three standardized test-samples: three prisms made of concrete having the dimensions 150x150x600mm. In the first stage, non-destructive tests were made using the Schmidt sclerometer and the Pundit Lab device. Based on the formula was measured an approximate value of the loading force for which the effort is reaching the corresponding resistance of the concrete rank; this approximate value of the loading force was achieved by nondestructive tests. In the final stage, results validation was performed by effective test on three standardized test-samples concrete prisms. The samples were tested with a bending load up to 250 kN in the SERVO PLUS EVOLUTION universal pressing device. The three tests and the standardized test-samples concrete prisms were performed and made according to the actual Romanian standards.

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Published in Journal of Young Scientist, Vol.I
Written by George Marian DASCALU, Alex Nicolae VADUVA

Clayey soils are soils with high shrink-swell potential. This soils have the property to significantly modify their volume when moisture changes. The magnitude of dry contraction and moisture swelling increases with the colloidal clay content. Minerals of the kaolinite group are the least active, while the montmorillonites are the most active. As shown by tests, the swelling potential and the plasticity of clays are high in clay of the montmorillonite type (bentonite) and rise with the fine-fraction content.

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Published in Journal of Young Scientist, Vol.I
Written by Marius ANDREI, Andreea ANDRONIC, Florin BITAN, Cristiana NISTOR

The main objective of this study is to determine the unit hydrograph of the Voineşti Basin, located in the north-west of Dâmboviţa county, at the border between the Curvature Sub-Carpathians,GeticSubcarpathians and Getic Plateau. Voinesti Basin shows climatic and hydrological characteristics specific to watershed that favors the production of fast velocity floods. The unit hydrograph is important for: (i) the design of various hydrotehnical constructions and (ii) determination of flooding hydrographs for a given storm data. The applied method statement consists of: (i) separation between direct runoff and the base flow (using a graphical method), (ii) determining the net precipitation, (iii) determining the unit hydrograph ordinates (iii) the selection of unit hydrograph which correspond to a uniform precipitation evenly distributed to basin. The study has been performed based on the analyses of the storm flow events from 1997-1998. The selected hydrograph was the one corresponded to august 2-nd 1997.

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Published in Journal of Young Scientist, Vol.I
Written by George Narcis PELEA

The paper aims presenting the main steps necessary for compiling the documentation for land improvement design. In the land improvement design are distinguished the following main steps: pre-feasibility study (P.F.S.), feasibility study (F.S.), technical design and execution details (P.T.+ D.E.), technical approval (D.T.), technical documentation for obtaining the construction permit (D.T.A.C.), technical expertise, documentation authorizing work intervention (D.A.L.I.). In the case study we will detail the content of a framework for obtaining the technical approval from A.N.I.F. Timis Agency for land improvement in the Western part of the country.

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Published in Journal of Young Scientist, Vol.I
Written by Elena Daniela ROTARU

The water scheme goal is to provide flood defence and to protect the objectives on the south side of Targu Frumos. In this paper I approach the issues of the optimal choice for an ideal design. This thing was possible by interpreting two solutions, using multi-criteria analysis. Also, I analyzed the aspect of the environmental impact during the execution of the work, as well as during the operation. After calculations, the second scenario is considered to be the optimal, thus solving the flooding problem on the south area of the city.

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Published in Journal of Young Scientist, Vol.I
Written by Şerban Dan ROŞULESCU

Soil degradation in its various forms is a fundamental and persistent problem. The situation in Europe is reflected and amplified in many parts of the world. It is also a matter of global development as land degradation, poverty and migration determine each other, but this is often ignored largely because the observed effects appear gradually. This paper presents forms of land degradation, processes and causes that must be considered to limit the effects of environmental degradation.

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Published in Journal of Young Scientist, Vol.I
Written by Ramona Rafila NICULAE

Long-term global economic growth may not be a realistic target since are not provided the appropriate and available mineral resources, which extraction affects – most often negative – the land surface stability. Therefore, it is necessary to reduce, if not to eliminate, impacts from mining activity through finding solutions based on monitoring the land surface movement. The main goal of the research is to achieve a better prognosis of the phenomenon, to protect the objectives located in the influence area of the underground mining, preventing their destruction.

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Published in Journal of Young Scientist, Vol.I
Written by Nicolae MĂRĂCINE

Deep erosion cause great damage, especially if they occur in areas with human activities. In this case refer this work shows increasing erosion causes, forms and processes of evolution and development techniques.

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Published in Journal of Young Scientist, Vol.I
Written by Daniela ILIE

The paper presents the evolution of Water Quality in Romania during the period 2004-2009 in the Buzau-Ialomita Basin who includes the rivers Buzau, Ialomita, Prahova, Calmatui, Mostistea*. It is based on the statistical data provided by Ministry of Environment and Climate Change. The information has been processed into the following indicators: water quality, phisico-chemical and biological status of water quality, accidental pollution. During the analyzed period, was found an increase in the length of river sections with water quality framed in IIIrd class, but the IVth and the Vth classes have registered an decrease by few percents. The average flow rate taken from 2004 to 2009 has modified in most areas.*distribution according to the National Administration of “Romanian Waters”.

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Published in Journal of Young Scientist, Vol.I
Written by Bogdan DUMITRU, Georgiana BUTUC, Marius GRUIA

In Romania there are yet many old buildings, who have suffered damage during earthquakes in the last century. Securing them is an important issue for the owners and of course for the authorities. The paper analyses the maximum displacements at the top of the structures under seismic actions at different heights. Maximum values are compared with allowable limits specified in current design codes. The study was conducted for RC frame structures with different heights. As a novelty authors used as entry data for structural modelling, the resulting values from the non-destructive tests on concrete and reinforced concrete samples. In the first part of this study relative positions of the two intrinsic centers, CG and CR, were calculated. Then, RC frame structures that have the same shape in plan, but different heights were modelled using Autodesk Robot structural analysis program. Because the maximum amplification was at the largest structure height, the second part of the study was to determine the displacement for structures with the same height but different shape in plan. In conclusion, the paper emphasises the influence of the height regime on the displacement at the top of the building and irregularities that influence on the same phenomenon. The results are conclusive and are discussed both on the charts and analytical results obtained. The activities of this research were conducted under the supervision of Mr. Claudiu-Sorin DRAGOMIR, Lecturer in the Department of Environment and Land Reclamation at the Faculty of Land Reclamation and Environmental Engineering of Bucharest.

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Published in Journal of Young Scientist, Vol.I
Written by Neculai DOGARU

The vast majority of rural economic activities are conducted under the direct effect of environmental conditions outdoors, where climate variability influences physiological processes of plants and growth animals conditions as those involved in development work such economic processes. Extreme weather events such as droughts, torrential rains, land degradation and soil assets fall into the category risk natural hazards expose human values. Trends in climate Cris basin is based on the main elements of weather observations recorded at the meteorological station Oradea, as well as data collected from various specialized archives. Elements established a specialized data base were processed by different methodologies.

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Published in Journal of Young Scientist, Vol.I
Written by Adrian COCOCEANU

The purpose of this paper is to obtain results through analytical modeling and physical behavior of pressure systems under transitory flow. Complexity of water flow, hypothesis and limitations of different equations governing the motion are studied by analysis using specialized software packages and validate the results obtained by measurements on experimental stands that shapet the physical phenomenon.

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Published in Journal of Young Scientist, Vol.I
Written by Leontin VISINESCU BRINZEA

Natural potential of an area determine its readiness to develop in sustainable conditions, is the basis of economic processes in rural areas. The study shows favorable conditions for agriculture are necessary to determine the extent to which each factor limiting agricultural productivity and natural supports.

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Published in Journal of Young Scientist, Vol.I
Written by Catalin BOTEA, Ramona PIRLOG, Ioan MARGARINT

The paper deals with non-destructive methods for determination of physical and mechanical characteristics of concrete specimens. The devices used for these determinations as Pundit Lab and Hammer Digi-Schmidt are in according with European and Romanian norms. The Pundit Lab is an ultrasonic pulse velocity (UPV) test instrument which is used to examine the quality of concrete. It features online data acquisition, waveform analysis and full remote control of all transmission parameters. The Schmidt Hammer Digi-Schmidt was developed for the non-destructive measurement of the concrete compressive strength and controlling the uniform concrete quality. The authors emphasizes that the use of non-destructive testing provides plausible values on compressive strength of concrete specimens. This statement is proved by results obtained from tests according to SR EN 12390-3: Testing hardened concrete - Part 3: Compressive strength of test specimens. For experimental determinations presented in this paper the devices belong of Concrete Laboratory of Land Reclamation and Environmental Engineering Faculty were used.

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Published in Journal of Young Scientist, Vol.I
Written by COMPLEX PLANNING SOLUTIONS FOR SOIL EROSION CONTROL ON A VINEYARD

The paper aims to present the complex planning solutions for soil erosion control on a given vineyard with a surface of 52 hectares, being located in the Ialomita River watershed, Ceptura area, Prahova County in Romania. Such solutions are based on the processing statistical data provided by Ploiesti Meteorological Station and Climatologically Atlas of Romania as well as on the computed soil loss by using Romanian soil erosion model. Data collected have been consisting into average annual precipitation, annual temperature and annual soil loss for the studied perimeter. The paper contains a descriptive memorandum concerning site description, current soil degradation and management situation, natural environment, needs and opportunities for designing the anti-erosion system, specific anti-erosion measures and works for vineyard. As a conclusion, the paper provides data about technical efficiency of designed measures and works as well as the answer of why these measures should be applied before arranging a vineyard.

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Published in Journal of Young Scientist, Vol.I
Written by Maria-Alexandra ARTAN, Mircea HAS, Elena-Daniela PANTEA, Ana PETRIŞOR, Ana Nicoleta POPESCU

The evapotranspiration is one of the components of hydrological cycle. This element is essential in calculus of hydrological water balance, design water works, determination of climate change, water resources planning and management. The aim of this study is to analyze the measured and estimated evapotranspiration at a station in Constanta. In order to estimate the evapotranspiration four methods were used: Thornthwaite, Hargreaves, Turc and Priestley and Taylor. The results of these equations were compared with observed evaporation. We used the data recorded in the interval of time 1970-1995. For these years, we were given: the annual medium temperatures and the monthly measured evapotranspiration.

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