Search results for "source"

EUROPEAN UNION EMISSIONS TRADING SYSTEM’S IMPACT ON LATVIA’S COMPETITIVENESS

2012

The goal of this paper is to analyse the general impact of the European Union Emissions Trading System (EU ETS) on Latvia’s competitiveness. The hypothesis of this paper – the EU ETS in past did not had a significant impact on Latvia’s competitiveness. At the beginning of the paper the EU ETS mechanism is discussed in the context of M.E. Porter’s identified principal factors determining state’s competitiveness. Afterwards the EU ETS operation in Latvia is described and its impact on Latvia’s competitiveness is analysed. The analysis is based on statistical data about Latvia’s 79 companies and their operation in 2005-2010, inter alia, allocations and transactions of European Union Allowances…

Evaluation of the Economic and Environmental Performance of Low-Temperature Heat to Power Conversion using a Reverse Electrodialysis – Multi-Effect D…

2019

In the examined heat engine, reverse electrodialysis (RED) is used to generate electricity from the salinity difference between two artificial solutions. The salinity gradient is restored through a multi-effect distillation system (MED) powered by low-temperature waste heat at 100 °C. The current work presents the first comprehensive economic and environmental analysis of this advanced concept, when varying the number of MED effects, the system sizing, the salt of the solutions, and other key parameters. The levelized cost of electricity (LCOE) has been calculated, showing that competitive solutions can be reached only when the system is at least medium to large scale. The lowest LCOE, at a…

Energy-saving analysis of hydraulic hybrid excavator based on common pressure rail

2013

Published version of an article in the journal: The Scientific World Journal. Also available from the publisher at: http://dx.doi.org/10.1155/2013/560694 Open Access Energy-saving research of excavators is becoming one hot topic due to the increasing energy crisis and environmental deterioration recently. Hydraulic hybrid excavator based on common pressure rail (HHEC) provides an alternative with electric hybrid excavator because it has high power density and environment friendly and easy to modify based on the existing manufacture process. This paper is focused on the fuel consumption of HHEC and the actuator dynamic response to assure that the new system can save energy without sacrificin…

Fabrication of cobalt and cobalt oxide/graphene composites: towards high-performance anode materials for lithium ion batteries.

2010

Le goût de l'effort

2018

Quelles sont les pratiques d'accompagnement à la scolarité mises en ouvre dans les familles des classes moyennes ? C'est à cette question que vient répondre ce livre en montrant notamment que, contrairement au discours qu'elles tiennent et à un apparent respect des frontières entre les prérogatives éducatives de la famille et celles de l'école, ces familles sont dans l'ensemble très actives dans le domaine de la transmission des savoirs. Elles mettent en ouvre de véritables savoirs didactiques qui sont au principe de dispositions scolaires et d'apprentissages.

Una revisión a la planificación de los recursos: sobre los enfoques de evaluación y los modelos de adaptación al uso turístico

2018

Mucho se ha hablado de la planificación del turismo. Solo cabe echar una mirada a la literatura académica para encontrar decenas de propuestas metodológicas que, desde inicios de los años 50 del siglo pasado, vienen exponiéndose. A pesar de esta vorágine creativa, todas ellas acaban, finalmente, enmarcándose en uno de los cinco enfoques identificados por Hall (2008). Sin embargo, al realizar ese mismo ejercicio para el caso de los recursos, considerados la base sobre la que asentar cualquier proceso de desarrollo turístico, los resultados sobre cómo planificarlos difieren considerablemente. Esta investigación, de carácter teórico, realiza una revisión bibliográfica de los trabajos académico…

Subtractive versus mass conserving metal shaping technologies: an environmental impact comparison

2015

The scientific studies in the domain of environmental sustainability of metal processing technologies predominantly focus on conventional material removal processes, as milling and turning. Despite some exceptions, many other non-machining technologies, such as metal forming processes, are still not well documented in terms of their energy and resource efficiency. Moreover, to properly evaluate the environmental impact of a given process, a standing-alone approach is no longer sufficient. In order to offer a valuable contribution in the domain of metal shaping sustainability, the present paper proposes a thorough methodology entailing to compare, from the environmental point of view, two tr…

Metal Cutting Operations and Terminology

2008

This chapter presents a general description of the machining processes and machining operations using various classification criteria. The classification of machining processes is based on the energy source used and the type of generating mechanisms, whereas the classification of machining operations utilizes characteristic motions describing their kinematics. Some examples of turning, milling, hole making, broaching and threading operations are provided. Kinematics of typical cutting operations and appropriate standardized cutting parameters are described. The geometry of cutting tools in the tool-in-hand and tool-in-use systems, including relevant tool angles, is characterized.

Computer-assisted orientation and drawing of archaeological pottery.

2018

Archaeologists spend considerable time orienting and drawing ceramic fragments by hand for documentation, to infer their manufacture, the nature of the discovery site and its chronology, and to develop hypotheses about commercial and cultural exchanges, social organisation, resource exploitation, and taphonomic processes. This study presents a survey of existing solutions to the time-consuming problem of orienting and drawing pottery fragments. Orientation is based on the 3D geometry of pottery models, which can now be acquired in minutes with low-cost 3D scanners. Several methods are presented: they are based on normal vectors, or circle fittings, or profile fittings. All these methods see…

Open Educational Resources - in Engineering Education, Case Study at UC/AGH, UB and ULBS

2019

Abstract To change the educational scene in the epoch of the digital generation there is the possibility of using Open Education (OE) and Open Educational Resources (OER). The term “open educational resources” refers to resources with free access to use, adaptation and redistribution. The objectives of the research are to determine the degree of knowledge and use of OER in three Engineering Universities in three countries (Poland, Hungary and Romania) and to find out whether there is a relationship between the institutions in terms of knowledge and use of OER. The measurement is made by applying the survey method on a sample of n = 192. As a tool we use the questionnaire with 15 questions s…