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匹配条件: “ Eugen Rusu” ,找到相关结果约808条。
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Evaluation of the Circulation Patterns in the Black Sea Using Remotely Sensed and in Situ Measurements  [PDF]
Robert Toderascu, Eugen Rusu
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.47094
Abstract:

The objective of the present work is to provide an overview of the general circulation features in the Black Sea basin. In order to achieve this, 18 years (1993-2010) of satellite data coming from the Aviso website were analyzed. A description of the general circulation patterns in the Black Sea is first presented. This is followed by statistical analyses of the satellite data in 20 points covering the entire area of the sea. The reference points were chosen as follows: 12 points along the Rim cyclonic current, 3 points inside the Rim cyclonic current, 4 points on the edge of two of the biggest anticyclonic gyres outside the Rim current and one point in the northwestern shelf area of the basin. Rose graphics were drawn for the reference points for winter and summer time. Finally, 9 years of in situ data obtained from the Gloria drilling platform were analyzed and compared with the satellite data. The present study shows that most of the reference points are sensitive to seasonal changes. The current velocities depend mostly on the points location: the points located on the Rim current and on the nearshore anticyclonic eddies present higher values than the ones located in or outside the general circulation features.

Studies Concerning the Influence of the Wave Farms on the Nearshore Processes  [PDF]
Andrei T?nase Zanopol, Florin Onea, Eugen Rusu
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.57065
Abstract:

The main objective of the present work is to evaluate the impact on the nearshore waves and coastal processes of a generic wave farm. The target area considered is in the Romanian nearshore, in the vicinity of the Mamaia sector, coastal environment usually subjected to a strong erosion process. A picture of the wave conditions in this coastal environment is first provided by analyzing some in situ data registered at the Gloria drilling unit, which operates offshore the area of interest at about 50 meters water depth. A high resolution numerical modeling framework was implemented in the target area. This is based on the SWAN spectral model (Simulating Waves Nearshore) for waves and the 1D circulation model SURF (or the Navy Standard Surf Model) to assess the nearshore currents. The presence of the farm in the computational domain was represented by using the command obstacle, which is available in SWAN, and considering various transmission and reflection coefficients. Different wave farm configurations have been considered by adjusting the transmission and the reflection coefficients associated with the wave farm, between a no farm scenario and a fully developed project (corresponding to the case of total absorption). The influence of the farm on the wave field was quantified by performing analyses in the geographical space concerning the variability of the significant wave height. The results look interesting and they indicate that besides the production of the electric power, the presence of the wave farms may have a positive influence on controlling the coastal processes, reducing the erosion and giving in general more stability to the coastal environment, especially during the extreme storm conditions.

Evaluation of Various Technologies for Wave Energy Conversion in the Portuguese Nearshore
Dina Silva,Eugen Rusu,Carlos Guedes Soares
Energies , 2013, DOI: 10.3390/en6031344
Abstract: The objective of the present work is to perform an evaluation of the performance provided by various technologies for wave energy conversion in the Portuguese continental coastal environment. The wave climate in the target area is first analyzed using the results from three years of simulations with a wave prediction system based on numerical models. Based on the above data, diagrams for the bivariate distributions of the sea states occurrences, defined by the significant wave height and the energy period, are designed for both winters and whole years. On this basis, the output of five different technologies for the conversion of wave energy is assessed in some relevant locations from the Portuguese nearshore. According to the results obtained, the Portuguese continental coastal environment appears to be appropriate for the wave energy extraction. At the same time, the present work shows that the output of the wave energy conversion devices does not depend only on the average wave energy but is also dependent on the distribution of the wave energy among the sea states of different periods. For this reason, a good agreement between the characteristics of the power matrices of the wave energy converters operating in a certain place and the diagrams for the bivariate distributions of the sea states occurrences corresponding to the considered location represents a key issue in selecting the most appropriate technology for wave energy conversion.
LOCAL DYNAMICS OF SPORTS GROUPS
Oana RUSU,Demmys RUSU
Sport si Societate : Revista de Educatie Fizica, Sport si Stiinte Conexe , 2011,
Abstract: Approaching the group as a complex system seems the most adequate way for the investigative endeavourtargeting the sports groups. The complex dynamics of small social groups may be analyzed on three levels: at the locallevel, the internal activities of the group are analyzed; at the global level, the processes and emergent states of the groupare brought to attention; at the contextual level, the influences of certain factors (economic, cultural, social, political,etc.) may model the composition, coherence, as well as group behaviour. Inside of a sports group (at local level), byusing the group resources, the members of the group interact with each other, resulting in role structures and status, incomplex organization and communication systems, in agreement with the objectives of the group. The size of the sportsgroups is given by the regulations of the sports branches and it may influence the processes and relationships within thegroup. The typology, functions, and parameters of the sports group are determined by a series of criteria. The spatialdistribution of the members of a sports group, as well as the perception on the group territory may influence theefficiency and quality of the social relationships between the group members.
The Purification of Residual Waters Using Natural Ion Exchangers
RUSU T.,A. RUSU
Proenvironment Promediu , 2009,
Abstract: Man’s day-by-day activities have a big impact on the environment so we continuously search fordifferent methods of cleaning it. In this paper is studied a very efficient way to purify the residual waters usingnatural ions exchangers. There are made a series of studies above the zeolites, as a class of specific structuresilicates. The main characteristic of the zeolites is the presence of some loose water molecules, the concedingand readmission of these being done without any damage to the crystal lattice. The paper contains a kineticstudy regarding the copper’s elimination from the residual waters, using the Mirsid volcanic tuff. Theexperimental study of the ionic exchange reaction permitted the appraisal of the speed limit stage and theinfluence of the parameters over the purifying process of the residual waters.
Strategies of Intensive Revaluation of Urban Wastes through Applying the Concept of Lasting Developing
RUSU T.,A. RUSU
Proenvironment Promediu , 2009,
Abstract: The paper presents a work analysis synthetically the main directions regarding the urban wastes management.It presents the priorities for Europe in general terms and for Romania in particular regarding revaluation of urban wastesas a modality of protecting natural resources and environment.
Online Project Management for Dynamic e-Collaboration
Lucia RUSU,Vasile RUSU
Informatica Economica Journal , 2010,
Abstract: Today's collaborative projects demand efficient and productive software application tools for the workplace that will bring remote teams together to get the work done. Dynamic e-collaboration is a necessity for virtual relations and business agreements. It depends on two distinct factors: trust and need. This paper presents a way to manage remote teams using a web application developed with ColMap model of project management in an IT company. The information exposed and shared applications with partners in collaborative projects are based on RBAC. Group collaboration and management software has been proven to successfully manage and coordinate projects.
A Scalar Acoustic Equation for Gases, Liquids, and Solids, Including Viscoelastic Media  [PDF]
Eugen Mamontov, Viktor Berbyuk
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.210109
Abstract: The work deals with a mathematical model for real-time acoustic monitoring of material parameters of media in multi-state viscoelastic engineering systems continuously operating in irregular external environments (e.g., wind turbines in cold climate areas, aircrafts, etc.). This monitoring is a high-reliability time-critical task. The work consistently derives a scalar wave PDE of the Stokes type for the non-equilibrium part (NEP) of the average normal stress in a medium. The explicit expression for the NEP of the corresponding pressure and the solution-adequateness condition are also obtained. The derived Stokes-type wave equation includes the stress relaxation time and is applicable to gases, liquids, and solids.
Security & Privacy Implications in the Placement of Biometric-Based ID Card for Rwanda Universities  [PDF]
Eugen Harinda, Etienne Ntagwirumugara
Journal of Information Security (JIS) , 2015, DOI: 10.4236/jis.2015.62010
Abstract: Biometric authentication systems are believed to be effective compared to traditional authentication systems. The introduction of biometrics into smart cards is said to result into biometric-based smart ID card with enhanced security. This paper discusses the biometric-based smart ID card with a particular emphasis on security and privacy implications in Rwanda universities environment. It highlights the security and implementation issues. The analysis shows that despite the necessity to implement biometric technology, absence of legal and regulatory requirements becomes a challenge to implementation of the proposed biometric solution. The paper is intended to engage a broad audience from Rwanda universities planning to introduce the biometric-based smart ID cards to verify students and staff for authentication purpose.
Regionalization in the Black Sea Area: a Comparative Study
Diana Rusu
Romanian Journal of European Affairs (RJEA) , 2011,
Abstract: The post-Cold War period in Europe was favourable for the development of new regionalization projects which surrounded the EU. The Baltic Sea, the Mediterranean Sea and the Black Sea became the centre of new European sub-regions. Each project stands out now through a certain image that it received mirroring its type and level of regionalization emerged at the junction of regional dynamics and external influences. While the Nordic region is addressed as a model of multi-level, locally driven cooperation, the Mediterranean region is embedded in the North- South developmental division approach with little cooperation and strong external influences. The Black Sea’s position is debated between the two models mentioned above. Thus, I propose a comparative analysis of these three cases aiming to trace down the similarities and differences between them with the focus on the Black Sea Region. The conclusion of the study places the Black Sea Region in between the cases with a genuine potential to follow the Nordic model but with its future evolution hanging on the EU’s policies toward the area.
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