Technological Educational Institute of Western Macedonia

About: Technological Educational Institute of Western Macedonia is a based out in . It is known for research contribution in the topics: Symplectic geometry & Numerical integration. The organization has 291 authors who have published 522 publications receiving 7682 citations. The organization is also known as: TEI of West Macedonia & TEI of Western Macedonia.

Frequency-Dependent Earth Impedance Formulas Between Overhead Conductors and Underground Pipelines

Abstract: Significant harmonic voltage induction levels can be caused by distribution power lines, especially in distribution networks of North America. To investigate the harmonic voltage induction caused by overhead distribution lines to underground insulated conductors, it is critical to calculate accurately the mutual earth impedance between the conductors. In this paper, a systematic comparison of the existing approaches for the calculation of the mutual impedance between overhead and underground insulated conductors is carried out. Comparisons include results obtained using Pollaczek’s complex integral formula, several approximate closed-form solutions proposed in the literature as well as the Finite Element Method. The analysis focuses in the frequency range up to some hundreds of Hz, where most significant levels of harmonic currents in distribution networks can be observed.

Application of μRaman Microscopy to the Identification of Individual Airborne Particles: Preliminary Results from Kozani's Area, Northern Greece

Abstract: In the present study, Raman spectroscopy combined with a con-focal microscope has been applied for the identification of airborne particulate matter collected from Kozani's area, northern Greece. This technique provided a rapid and accurate identification of the molecular composition of micrometer sized (down to 2 µm) airborne particles. Different experimental conditions (laser excitation wavelength of 532 and 780 nm, slit and pinhole aperture, 50× and 100× objectives, number of exposures, and time of each exposure) were employed in order to obtain the optimal analytical parameters. The slit aperture and the 532 nm laser source were preferable. Removal of the background interference caused by the blank Teflon filter was performed for the acquisition of Raman spectra of minute ( 10 µm). Several distinct mineral phases were determined, such as: the common geogenic minerals calcite, gypsum, anhydrite, titanium ox...

Effects of High Stocking Grazing Density of Diverse Swards on Forage Production, Animal Performance and Soil Organic Matter: A Case Study

Abstract: Mob grazing is regarded as a grazing management practice to increase soil organic matter, pasture productivity and nutrient cycling. There are different perspectives in the literature regarding the definition of mob grazing, but it is generally accepted that mob grazing is characterised by high stocking densities of livestock which are moved frequently from paddock to paddock (e.g. with the aid of electric fences), trampling forage into the soil as they graze. It has also been recognised that biodiverse pastures have the potential to build up carbon levels in the soil much more effectively than conventional (usually monocultures) or less diverse pastures; in turn all can enhance animal productivity and maintain good herd health. This paper reviews the concept of mob grazing and the benefits of diverse swards and provides evidence whether high stocking density as a grazing strategy can increase soil organic matter and enhance overall animal performance, based on observations on one farm. The grazing rotation applied in the farm during the study year was rather short to fulfil the expectations of a mob-grazing system, but stocking density was high (115 t LW ha−1). The results show that high stocking grazing density of biodiverse pastures has a remarkable effect on the build-up of the soil organic matter and that biodiverse pastures can serve as a viable alternative to conventional pastures as they can maintain animal productivity at high levels.

Mobile intelligent agent technology for QoS provisioning and network management

Abstract: The DiffServ architecture provides a scalable mechanism for QoS introduction in a TCP/IP network. DiffServ model is based on the aggregation of traffic flows at an ingress (or egress) point of a network and the IP packet marking for different priority flows, according to several classification criteria. Two approaches exist in the DiffServ architecture: the Absolute and the Relative. In Absolute DiffServ, an admission control scheme is used to provide QoS guarantees as absolute bounds of specific QoS parameters. The Relative DiffServ model provides QoS guarantees per service class expressed with reference to guarantees given to other classes defined. Our study presents a QoS Provisioning & Network Management System. This system is based on an extension of the network management architecture followed and implemented within the scope of the European IST Project MANTRIP. MANTRIP network management system supports quality of service configuration and monitoring in IP networks. Our extension provides QoS Differentiation (Absolute and Relative) in IP DiffServ based Networks. The proposed system has been applied and performed well on a real network testbed.

Gamifying e-learning as a Means of Overcoming Its Deficiencies

Abstract: In the last 20 years computers have been playing an increasingly important part in all aspects of everyday life, changing the way people understand but mostly the way people do things. Education, an integral part of every person's life, could not have been left unaffected by these changes. Almost from the beginning, computer scientists and education specialists have been searching for ways to integrate computer technology in the learning process for the benefit of the teacher and the student. Two promising ways to achieve this goal are e-learning and gamification. In this paper a study related to these two modern technologies is presented.