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Hypertexts: From the digital environment to the printed books of children’s literature: a case in Greek
Tzina Kalogirou,Vassiliki Gkouni
Caracteres : Estudios Culturales y Críticos de la Esfera Digital , 2012,
Abstract: Hypertext is a particular kind of text that allows the readers move to its end through a non-sequential way as it consists of different “paths” and “links”. In comparison to the ordinary printed texts, hypertexts present significant differences referring to their structural characteristics, while they make the reading process different as well. This open- ended type of database system was created in the digital environment but nowadays it’s also found in printed works of children’s literature. A great Greek author, Eugene Trivizas, has written two masterpieces of this kind of texts. The complex structure of these literary books affects positively the cognitive, social and emotional development of young readers but it makes their approach in the classroom difficult. However, differentiated teaching is a modern instructive method that can be used by the teachers in the classroom in order to help their students to deal with difficulties of this kind.
Analysis and Causal Formulation Proof of an Optimal Iterative Learning Algorithm  [PDF]
Vassiliki Vita
Intelligent Control and Automation (ICA) , 2010, DOI: 10.4236/ica.2010.12010
Abstract: Iterative learning control (ILC) is used to control systems that operate in a repetitive mode, improving track-ing accuracy of the control by transferring data from one repetition of a task, to the next. In this paper an op-timal iterative learning algorithm for discrete linear systems is analyzed and a solution for its attainment is proposed. Finally the mathematical proof of the algorithm’s causal formulation is also provided in its com-plete form, since its implementation requires its causal formulation.
Τhe Contribution of Music and Movement Activities to Creative Thinking in Pre-School Children  [PDF]
Elena Chronopoulou, Vassiliki Riga
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.32031
Abstract: As interest in creativity is rising, kindergarten teachers are looking for ways to strengthen the creative potential of young children. The aim of this study was to investigate the effect of music and movement activities to creative thinking in preschool children. A three month educational programme was designed and implemented, using an experimental research method. The effect on fluency, flexibility, originality and elaboration of thought of 5 year old children, as well as how the programme affected creative behaviours, was studied. The results, upon completion of the educational programme, showed that the growth rate of these variables in the experimental group was statistically significant compared to the corresponding rates in the control group. In addition, the emergence of creative behaviours, such as an increased freedom of expression, a tendency to explore and experiment, and a questioning of what is commonly accepted, were considered to be a consequence of the implementation of the specific educational programme. The experimental research produced valuable information about the design and philosophy of educational programmes, and about the teaching methods of music and movement activities in kindergarten.
Therapeutic outcome and cost-effectiveness analysis of patients treated in Groupal methods (group analysis, psychodrama, therapeutic community)
Villiotou Vassiliki
Annals of General Psychiatry , 2006, DOI: 10.1186/1744-859x-5-s1-s45
Abstract:
Online Diagnostic Assessment: Potential and Limitations (The case of DIALANG in the Greek Junior High School Context)
Vassiliki Baglantzi
Research Papers in Language Teaching and Learning , 2012,
Abstract: This study explored the potential of DIALANG to serve placement purposes in the 1st grade of Greek state junior high school. The DIALANG system of language assessment is an application of the Common European Framework of Reference (Council of Europe, 2001), which assesses the user’s level in five skills (listening, writing, reading, vocabulary and structures) and places them on one of the six (A1-C2) CEFR levels. It is a valid and reliable, online diagnostic test, which makes extensive use of self-assessment and provides several types of feedback. So far, DIALANG has been mainly used by adult learners in 14 languages in self-access, low-stakes contexts around Europe. However, the research focus in this study is whether DIALANG can replace teacher made placement tests for younger learners of English. Teacher-made tests are often criticized on the grounds of validity, reliability and content, therefore the use of a standardized alternative would facilitate placement procedures in a valid and reliable way. 20 students took DIALANG and then reported on their experience through a questionnaire. The students were also involved in self-assessing their reading, writing and listening skills using the DIALANG self-assessment statements. Their teacher also used the DIALANG scales to assess the students’ proficiency level in these three skills. The research findings showed that DIALANG can be a highly practical and useful placement tool provided that it is limited to the assessment of three skills (listening, writing and reading) out of the five it can assess. Results also showed that neither the students nor the teacher are adequately familiar with the DIALANG statements and consequently the CEFR skills level descriptors, although these levels are extensively used in the description of textbooks, language courses and exams in the ELT field in Greece.
The Economics of professional team sports: content, trends and future developments
VASSILIKI AVGERINOU
Choregia , 2007,
Abstract: The objective of this paper is to present the prevailing content, trends and future developments of professional team sports economics. The purpose of this paper is not to provide a full record of all professional team sports related research with an economic content, but rather to point out the main issues that sports economics tackle since their birth and track the evolution of these issues as a response to the changing environment of team sports. League market structure, team objectives, demand, financing, labour markets and sports broadcasting are the most prominent areas of interest in professional team sports economics. Differences in organizational structure of professional team sports in Europe and U.S.A. shape the research agenda on the two sides of the Atlantic accordingly. Future developments should capture both economic and social aspects of contemporary professional team sports.
Coalescence Rates of Double Neutron Stars
Vassiliki Kalogera
Physics , 1999,
Abstract: Merger events of close double neutron stars (DNS) lie at the basis of a number of current issues in relativistic astrophysics, such as the indirect and possible direct detection of gravitational waves, the production of gamma-ray bursts at cosmological distances, and the origin of r-process elements in the universe. In assessing the importance or relevance of DNS coalescence to these issues, knowledge of the rate of coalescence in our Galaxy is required. In this paper, I review the current estimates of the DNS merger rate (theoretical and empirical) and discuss new ways to obtain limits on this rate using all information available at present.
Formation of Low-Mass X-ray Binaries. III. A New Formation Mechanism: Direct Supernova
Vassiliki Kalogera
Physics , 1996,
Abstract: We propose a new formation mechanism (direct-supernova) for low-mass X-ray binaries (LMXBs) that does not involve any prior phase of mass transfer. Survival through the supernova (SN) explosion and shrinkage of the orbit is achieved by a kick velocity of appropriate magnitude and direction imparted to the neutron star at its birth. We present analytical population synthesis calculations of LMXBs forming via both the direct-SN and the helium-star SN mechanisms, and compare the results. We find that the direct-SN channel contributes a non-negligible fraction of the total LMXB population, depending strongly on the r.m.s. magnitude of the kick velocity. More importantly, the direct-SN mechanism provides a natural way for the formation of low-mass binary pulsars in nearly circular orbits with orbital periods in excess of about 100 days, which cannot have been formed via the helium-star SN mechanism.
Orbital Characteristics of Binary Systems after Asymmetric Supernova Explosions
Vassiliki Kalogera
Physics , 1996, DOI: 10.1086/177974
Abstract: We present an analytical method for studying the changes of the orbital characteristics of binary systems with circular orbits due to a kick velocity imparted to the newborn neutron star during a supernova explosion (SN). Assuming a Maxwellian distribution of kick velocities we derive analytical expressions for the distribution functions of orbital separations and eccentricities immediately after the explosion, of orbital separations after circularization of the post-SN orbits, and of systemic velocities of binaries that remain bound after the explosion. These distributions of binary characteristics can be used to perform analytical population synthesis calculations of various types of binaries, the formation of which involves a supernova explosion. We study in detail the dependence of the derived distributions on the kick velocity and the pre-SN characteristics, we identify all the limits imposed on the post-SN orbital characteristics, and we discuss their implications for the population of X-ray binaries and double neutron star systems. We show that large kick velocities do not necessarily result in large systemic velocities; for typical X-ray binary progenitors the maximum post-SN systemic velocity is comparable to the relative orbital velocity prior to the explosion. We also find that, unless accretion-induced collapse is a viable formation channel, X-ray binaries in globular clusters have most probably been formed by stellar dynamical interactions only, and not directly from primordial binaries.
Formation of Black-Hole X-Ray Binaries with Low-Mass Donors
Vassiliki Kalogera
Physics , 1999,
Abstract: The characteristics of black-hole X-ray binaries can be used to obtain information about their evolutionary history and the process of black-hole formation. In this paper I focus on systems with donor masses lower than the inferred black-hole masses. Current models for the evolution of hydrogen-rich, massive stars and of helium stars losing mass in a wind cannot explain the current sample of black-hole mass measurements. Assuming that the radial evolution of mass-losing massive stars is at least qualitatively accurate, I show that the properties of the BH companions lead to constraints on the masses of black-hole progenitors (at most twice the black-hole mass) and on the strength of winds in helium stars (fractional amount of mass lost smaller than about 50%). Constraints on common-envelope evolution are also derived.
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