Numerical Methods for Obtaining Multimedia Graphical Effects

This paper is an explanatory document about how several animations effects can be obtained using different numerical methods, as well as investigating the possibility of implementing them on very simple yet powerful massive parallel machines. The methods are clearly described, containing graphical examples of the effects, as well as workflow for the algorithms. All of the methods presented in this paper use only numerical matrix manipulations, which usually are fast, and do not require the use of any other graphical software application.raster graphics, numerical matrix manipulation, animation effects

Transonic Airfoil Flow Simulation. Part II: Inviscid-Viscous Coupling Scheme

A calculation method for the subsonic and transonic viscous flow over airfoil using the displacement surface concept is described. This modelling technique uses a finite volume method for the time-dependent Euler equations and laminar and turbulent boundary-layer integral methods. In additional special models for transition, laminar or turbulent separation bubbles and trailing edge treatment have been selected. However, the flow is limited to small parts of trailing edge-type separation. Comparisons with experimental data and other methods are shown

Blowing jets as a circulation flow control to enhancement the lift of wing or generated power of wind turbine

The goal of this paper is to provide a numerical flow analysis based on RANS equations in two directions: the study of augmented high-lift system for a cross-section airfoil of a wing up to transonic regime and the circulation control implemented by tangentially blowing jet over a highly curved surface due to Coanda effect on a rotor blade for a wind turbine. This study were analyzed the performance, sensitivities and limitations of the circulation control method based on blowing jet for a fixed wing as well as for a rotating wing. Directions of future research are identified and discussed

The laminar boundary layer on a rotating wind turbine blade

The present paper describes a method to calculate velocity profiles in the boundary layer ofrotating blade. A differential approach is used to solve the laminar boundary layer equations. Theeffects of tip speed ratio, dimensionless radial position r/R and angle of attack have been analyzed.The test airfoils used in the simulations are NACA 63-215 and S809. The resulting velocity profiles inthe chordwise and spanwise directions are mapped and stored in a Database according to theboundary layer parameters

Towards ServMark, an Architecture for Testing Grid Services

Technical University of Delft - Technical Report ServMark-2006-002, July 2006Grid computing provides a natural way to aggregate resources from different administrative domains for building large scale distributed environments. The Web Services paradigm proposes a way by which virtual services can be seamlessly integrated into global-scale solutions to complex problems. While the usage of Grid technology ranges from academia and research to business world and production, two issues must be considered: that the promised functionality can be accurately quantified and that the performance can be evaluated based on well defined means. Without adequate functionality demonstrators, systems cannot be tuned or adequately configured, and Web services cannot be stressed adequately in production environment. Without performance evaluation systems, the system design and procurement processes are limp, and the performance of Web Services in production cannot be assessed. In this paper, we present ServMark, a carefully researched tool for Grid performance evaluation. While we acknowledge that a lot of ground must be covered to fulfill the requirements of a system for testing Grid environments, and Web (and Grid) Services, we believe that ServMark addresses the minimal set of critical issues

Transabdominal pre-peritoneal repair procedure (TAPP) versus open hernia repair (OHR) in the treatment of inguinal hernia

Inguinal hernia is a common condition, with about 30% of men and 6% of women developing this condition throughout their lifetime. Laparoscopic hernia repair procedures have become more and more important lately, due to the advantages of a fast recovery and reduced postoperative pain. The paper presents our clinical experience involving the TAPP repair procedure, compared to open hernia repair (OHR). We retrospectively compared our first 50 cases comprising patients who underwent the TAPP hernia repair procedure between January 2018 and June 2020, with 50 cases who underwent the OHR procedure in the same period. The total operation duration was 102.5 minutes in the TAPP group and 78.4 minutes in the OHR group. The average hospital stay in the TAPP group was 1.5 days with six patients requiring reinterventions for postoperative bleeding and who were discharged seven to nine days later. There is still no consensus regarding the use of tacks and/or the surgical glue, the surgeon\u27s experience and the intraoperative findings representing a cornerstone in choosing the best repair method for each case. Laparoscopic hernia repair has some advantages over the open technique, but it can be followed by complications that can further raise parameters

Gridovi fine prostorne rezolucije dnevnih visina snijega za Rumunjsku (2005.–2015.)

This study presents the spatial interpolation procedure from snow depth measurements at weather stations implying the following stages: (1) Spatial interpolation at 1 km × 1 km resolution of the mean multiannual values (2005-2015) corresponding to each month, computed from the data extracted from the climatological database; (2) Computation of the daily deviations against the multiannual monthly mean for every day and year over 2005–2015 and their spatial interpolation; (3) Spatio-temporal datasets were obtained through merging the two surfaces obtained in stages 1 and 2. The anomalies were considered to be the ratio between the daily snow depth values and the climatology. The spatial variability of the data used in the first stage was accounted for through the use of a series of predictors derived from the digital elevation model (DEM). To plot the maps with the climatological normals (multiannual means), the Regression-Kriging (RK) spatial interpolation method was used. In order to choose the optimum method applied in spatializing deviations, four interpolation methods were tested using a cross-validation procedure: Multiquadratic, Ordinary Kriging (separated and pooled variograms) and 3d Kriging.Ova studija prikazuje proceduru prostorne interpolacije mjerenja dubine snijega na meteorološkim postajama koja podrazumijeva sljedeće faze: (1) prostorna interpolacija pri rezoluciji od 1 km x 1 km srednjih višegodišnjih vrijednosti (2005.–2015.), koja se provodi s podacima iz klimatološke baze; (2) izračunavanje dnevnih odstupanja od višegodišnjeg mjesečnog srednjaka za svaki dan i godinu tijekom razdoblja od 2005. do 2015. i njihova prostorna interpolacija; (3) prostorno-vremenski skup podataka dobiven je združivanjem procjena dobivenih u fazi 1 i 2. Odstupanja su definirana kao omjeri dnevnih vrijednosti dubine snijeg i klimatološkog srednjaka. Prostorna varijabilnost podataka korištenih u prvoj fazi objašnjena je korištenjem niza prediktora izvedenih iz digitalnog modela visina (DEM). Karte klimatoloških normala (višegodišnji srednjaci) izrađene su metodom prostorne interpolacije zvanom regresijski kriging (RK). Za odabir optimalne metode za prostornu interpolaciju odstupanja, testirane su četiri metode interpolacije i ocijenjene pomoću postupka poprečne validacije: multikvadratična, obični kriging (razdvojeni i skupni variogrami) i 3D kriging

Opportunities for Urban Regeneration Operations and Re-evaluation of Existing Framework, Bucharest Industrial Areas Specific Issues

The expansion of the city, in many cases, has resulted in increased costs for installations and technical equipment and the amenities for housing, movement, health, education, leisure, etc. Spatial expansion of cities, with advantages and disadvantages, occurs in parallel with the growth of population and its movement to the great metropolitan areas situated at the periphery. As a result, urban density decreases within the city, but problems arise in housing quality, urban traffic management, waste management, increasing pollution sources, etc. Problems and challenges of interventions on the urban framework are linked to a large extent with the issue of limiting the operations, both in terms of goals and the implementation stages, as well in terms of space, because often the approach of solving certain dysfunctions in an area implies significant changes in the surrounding areas. This article presents the opportunities regarding urban regeneration operations, the need to approach urban regeneration being revealed after a brief analysis of the types of intervention on the urban framework of former industrialareas in Bucharest City and their corresponding projects, analysis carried out in terms of how these projects meet the criteria of frequently used urban interventions such as the renovation, reconstruction, modernization, revitalization and restructuring. Thus, we can see that in terms of industrial space utilization is carried out a transition to a mixed-used area which manifests itself by building commercial functions, services and housing, this operation being realized in a spontaneous manner, rather than being a planned and integrated process. Moreover, urban regeneration is a strategic activity that involves short-term measures to resolve the immediate difficulties and long-term approach to avoid future problem

Monthly Rainfall Erosivity: Conversion Factors for Different Time Resolutions and Regional Assessments

As a follow up and an advancement of the recently published Rainfall Erosivity Database at European Scale (REDES) and the respective mean annual R-factor map, the monthly aspect of rainfall erosivity has been added to REDES. Rainfall erosivity is crucial to be considered at a monthly resolution, for the optimization of land management (seasonal variation of vegetation cover and agricultural support practices) as well as natural hazard protection (landslides and flood prediction). We expanded REDES by 140 rainfall stations, thus covering areas where monthly R-factor values were missing (Slovakia, Poland) or former data density was not satisfactory (Austria, France, and Spain). The different time resolutions (from 5 to 60 min) of high temporal data require a conversion of monthly R-factor based on a pool of stations with available data at all time resolutions. Because the conversion factors show smaller monthly variability in winter (January: 1.54) than in summer (August: 2.13), applying conversion factors on a monthly basis is suggested. The estimated monthly conversion factors allow transferring the R-factor to the desired time resolution at a European scale. The June to September period contributes to 53% of the annual rainfall erosivity in Europe, with different spatial and temporal patterns depending on the region. The study also investigated the heterogeneous seasonal patterns in different regions of Europe: on average, the Northern and Central European countries exhibit the largest R-factor values in summer, while the Southern European countries do so from October to January. In almost all countries (excluding Ireland, United Kingdom and North France), the seasonal variability of rainfall erosivity is high. Very few areas (mainly located in Spain and France) show the largest from February to April. The average monthly erosivity density is very large in August (1.67) and July (1.63), while very small in January and February (0.37). This study addresses the need to develop monthly calibration factors for seasonal estimation of rainfall erosivity and presents the spatial patterns of monthly rainfall erosivity in European Union and Switzerland. Moreover, the study presents the regions and seasons under threat of rainfall erosivity.JRC.H.5-Land Resources Managemen

ANALYSIS OF THE CORRELATION BETWEEN PROFITABILITY AND RISK IN THE SERVICES SECTOR IN DOLJ REGION

The research work consists of an analysis of the correlation between profitability indicators and the risk the company is facing. A range of profitability indicators, as well as risk indicators had to be determined in order to establish the correlation degree. The method used in correlation analysis is based on the Pearson index, used by means of the SPSS software. Profitability ratios and risk indicators were analysed for 300 business entities operating on the market of computer, financial and accounting services in Dolj region, during 2015-201