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Optical Communication
No full textOptical communication is very much useful part in our advanced fibre-based
telecommunication systems, data processing and networking. It consists of a
transmitter that encodes a message into an optical signal, a channel that carries the
signal to its desired destination, and a receiver that reproduces the message from the
received optical signal. It presents up to date results on communication systems, along
with the explanations of their relevance, from leading researchers in this field. The
chapters cover general concepts of optical communication, components for optical
communication, optical communication systems and networks, signal processing and
MIMO systems. In recent years, optical components and other enhanced signal
processing functions are also considered in depth for optical communications systems.
The researcher has also concentrated on optical devices, networking, signal processing,
and MIMO systems and other enhanced functions for optical communication. This
book is targeted at research, development and design engineers from the teams in
manufacturing industry, academia and telecommunication industries.
This book presents a high level technical overview of the emerging technologies of
optical communication and networking systems. It is intended as an introduction to
the field for optical communication and network professionals, such as higher degree
research students, academics and design engineers. Although it is intended for
professionals who already have some technical background, it is nevertheless relevant
to anyone wishing to understand optical communication or networking
Methods for Nondestructive Determination of Elastic and Dissipative Material Properties
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Attālinātais darbs Latvijas reģionu attīstībai
No full textArvien vairāk uzņēmumu un organizāciju izmanto attālināto darbu jeb teledarbu, kas ļauj darbiniekam un tam veicamajiem uzdevumiem tikt nodalītiem no uzņēmuma fiziskās atrašanās vietas. Lai veicinātu attālinātā darba izmantošanu, vairākās Eiropas valstīs ir izveidoti attālinātā darba centri, piemēram, Francijā, Lielbritānijā un Ungārijā. Iedzīvotāju anketēšanas rezultāti divas Latvijas pašvaldībās – Balvos Latgalē un Limbažos Vidzemē – apstiprina, ka attālinātajam darbam ir perspektīvas arī Latvijā. Ja attālinātā darba centri sadarbotos ar uzņēmējdarbības atbalsta sniedzējiem, piedāvājot konsultācijas uzņēmējdarbības uzsākšanai un attīstībai, tie varētu sniegt būtisku ieguldījumu teritorijas sociālekonomiskajā attīstībā
Synthesis and studies of properties of 1,4-dihydropyridine amphiphiles
No full textTwo modifications of Hantzsch type synthesis of parent 1,4-DHP derivative were elaborated. N-Bromosuccinimide and 1,3-dibromo-5,5-dimethylhydantion were used as bromination agents.
eEcosystem Driven eLearning vs Technology Driven e-Learning
No full texteEcosystem is an innovative cross-media learning approach that goes beyond traditional web-based learning design strategies. The approach combines wide availability of television and mobile technologies with the capacity and flexibility of Internet based e-learning. This approach allows the learner to use either a single learning delivery system (depending on availability and preferences) or a complementary combination of two or three delivery systems, thus supporting the anywhere, anytime — by any preference—learning paradigm. The development of the eBig3/ETM learning solutions includes integration of technical aspects of cross-media learning content delivery. Moreover, the approach incorporates pedagogical and usability principles based on an understanding of the target users learning needs and their contexts
E-Inclusion Measurment by E-Learning Course Delivery
No full textOur purpose was to identify how practical uses of digital skills could be improved in the context of an e-learning course. For this purpose, we identified certain variables to be correlated for practical uses probability as a guide for their effectiveness for e-learning quality assessment. The study identified the following variables: the instructor’s support, the students’ interest, self-evaluations performed by the students in content knowledge before and after the topics of the e-course, and an evaluation of the e-learning environment and materials for quality. The study was based on evaluating a group of five hundred learners. We designed four types of questionnaires and one interview to assess different aspects of the course topics that affect the practical uses of digital skills. The authors applied knowledge management theory and statistical analysis. We developed a formula for multiple linear regression equations for practical uses of digital skills probability and as potential predictors for effective delivery of different topics of an e-learning course. The results indicated that the key factors for determining practical uses probability in the e-inclusion model for an e-learning course were: the degree of evaluation of the e-learning environment and materials for quality and the degree of students’ willingness and ability to learn.
Competence Based Assessment Considerations within ePortfolio System
No full textThis paper addresses the problem of assessing learners’ competences levels and giving appropriate suggestions and probable solutions based on these assessments, as well as seeking perspective ways to make ePortfolio systems more flexible and intelligent, which would result in creation, development and implementation of new interactive ePortfolio system. The first algorithmic model was developed and prototype of such system was introduced and conducted for „Business Planning for Open Markets” course bachelor study programme students by the Distance Education Study Centre (DESC), Riga Technical University (RTU), in the autumn semester of study year 2011/2012, from 5 September 2011 to 27 January 2012. This system prototype ensured the record of competences development process, groupwork environment, peer and self assessment fields, feedback review, and possibility of sending learning suggestions to learners (at this stage by tutors only). We have found the correlation between students’ activities in ePortfolio system, on one hand, and their test marks, exam results and achieved competencies, on the other hand. New system encouraged students to think critically; ePortfolio students’ groups with high activity achieved better outcomes rather than inactive ones. The system made it possible to break the neck of the most complicated course themes, as well as make improvements of students’ exercise works – their business plans
Greenhouse Gas Emission Reduction Perspectives in the Baltic States In Frames of EU Energy and Climate Policy
No full textThe goal of this paper is to estimate the perspectives of the Baltic States: Estonia, Latvia and Lithuania on meeting the new European Union climate commitments, i.e., to reduce greenhouse gas emissions by 20% to the year 2020 in comparison with 1990. This ambitious target could be reached based on other EU climate and energy package commitments: increase of the share of renewables and improvement of energy efficiency as tools for fulfilling the GHG emissions reduction target. The paper gives an overview on the current situation and future plans of the Baltic States in the field of energy efficiency, consumption of renewables and reduction of GHG emission