bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determination of Heat Accumulation Coefficient for Oil Bonded Moulding Sands
Authors: Łągiewka M. , Konopka Z. , Zyska A. , Nadolski M. 
Published: July 2013

Abstract
The possibility of controlling the solidification and cooling time of castings creates prospects of improving their structure and by the same their properties. Thermal properties of the mould constitute therefore an important factor which is necessary to consider while seeking for the mentioned improvement. The presented work illustrates the method of determining some basic thermal coefficients of moulding material, i.e. the coefficient of temperature equalisation a2, known also as the temperature diffusivity, and the heat accumulation coefficient b2, which characterises the ability of moulding material to draw away the heat from a casting. The method consists in experimental determining the temperature field within the mould during the processes of pouring, solidification and cooling of the casting. The performed measurements allow for convenient and exact calculations of the sought-after coefficients. Examinations were performed for the oil bonded moulding sand of trade name OBB SAND ‘E’. The experiment showed that the obtained value of b2 coefficient differs from the value calculated on the basis of theoretical considerations available in publications. Therefore it can be stated that theoretical calculations of the heat accumulation coefficient are thus far not sufficient and not quite reliable, so that these calculations should be verified experimentally.
The Influence of Casting Defects on Fatigue Resistance of Elektron 21 Magnesium Alloy
Authors: Pikos I. , Kiełbus A. , Adamiec J. 
Published: July 2013

Abstract
The Mg-RE alloys are attractive, constructional materials, especially for aircraft and automotive industry, thanks to combination of low density, good mechanical properties, also at elevated temperature, and good castability and machinability. Present paper contains results of fatigue resistance test carried out on Elektron 21 magnesium alloy, followed by microstructural and fractographical investigation of material after test. The as-cast material has been heat treated according to two different procedures. The fatigue resistance test has been conducted with 106 cycles of uniaxial, sine wave form stress between 9 MPa and 90 MPa. Fractures of specimens, which ruptured during the test, have been investigated with scanning electron microscope. The microstructure of specimens has been investigated with light microscopy. Detrimental effect of casting defects, as inclusions and porosity, on fatigue resistance has been proved. Also the influence of heat treatment's parameters has been described.
New Investigation Method of the Permeability of Ceramic Moulds Applied in the Investment Casting Technology / Nowa metoda oceny przepuszczalności form ceramicznych stosowanych w technologii wytapianych modeli
Authors: Zych J. , Kolczyk J. , Snopkiewicz T. 
Published: July 2013

Abstract
The new investigation method of a permeability of ceramic moulds applied in the investment casting technology, is presented in the paper. Some concepts of performing permeability measurements are shown. Investigations in which the influence of the solid phase fraction in the liquid ceramic moulding sand (LCMS) on a permeability of a multi-layer ceramic mould were performed and discussed. The permeability was estimated during two the most important stages of the technological process: in the first - after wax melting and in the second - after mould annealing. Also an influence of the matrix grain sizes (material for sprinkling) on a ceramic mould permeability was estimated.
Optimization of Squeeze Parameters and Modification of AlSi7Mg Alloy
Authors: Zyska A. , Konopka Z. , Łągiewka M. , Nadolski M. 
Published: July 2013

Abstract
The paper present the examination results concerning mechanical properties of castings made of AlSi7MG alloy in correlation both with the most significant squeeze casting parameters and with the modification treatment. Experiments were planned and held according to the 23 factorial design. The regression equations describing the influence of the squeeze pressure, the mould temperature, and the quantity of strontium modifier on the strength and elongation of the examined alloy were obtained. It was found that the main factor controlling the strength increase is the squeeze pressure, while the plasticity (A5) of the alloy is affected most advantageously by modification. The application of modification treatment in squeeze casting technology enables for production of the slab-type castings made of AlSi7Mg alloy exhibiting strength at the level of 230 MPa and elongation exceeding 14%.
Screening for antiradical efficiency of 21 semi-synthetic derivatives of quercetin in a DPPH assay
Authors: Milackova Ivana , Kovacikova Lucia , Veverka Miroslav , Gallovic Ján , Stefek Milan 
Published: July 2013

Abstract
The group of 21 novel semi-synthetic derivatives of quercetin was screened for the antiradical efficiency in a DPPH assay. The initial fast absorbance decrease of DPPH, corresponding to the transfer of the most labile H atoms, was followed by a much slower absorbance decline representing the residual antiradical activity of the antioxidant degradation products. Initial velocity of DPPH decolorization determined for the first 75-s interval was used as a marker of the antiradical activity. Application of the kinetic parameter allowed good discrimination between the polyphenolic compounds studied. The most efficient chloronaphthoquinone derivative (compound Ia) was characterized by antiradical activity higher than that of quercetin and comparable with that of trolox. Under the experimental conditions used, one molecule of Ia was found to quench 2.6±0.1 DPPH radicals.
Evolving Non-Dominated Parameter Sets for Computational Models from Multiple Experiments
Authors: Lane Peter C. R. , Gobet Fernand 
Published: July 2013

Abstract
Creating robust, reproducible and optimal computational models is a key challenge for theorists in many sciences. Psychology and cognitive science face particular challenges as large amounts of data are collected and many models are not amenable to analytical techniques for calculating parameter sets. Particular problems are to locate the full range of acceptable model parameters for a given dataset, and to confirm the consistency of model parameters across different datasets. Resolving these problems will provide a better understanding of the behaviour of computational models, and so support the development of general and robust models. In this article, we address these problems using evolutionary algorithms to develop parameters for computational models against multiple sets of experimental data; in particular, we propose the ‘speciated non-dominated sorting genetic algorithm’ for evolving models in several theories. We discuss the problem of developing a model of categorisation using twenty-nine sets of data and models drawn from four different theories. We find that the evolutionary algorithms generate high quality models, adapted to provide a good fit to all available data.
Conceptual Commitments of the LIDA Model of Cognition
Authors: Franklin Stan , Strain Steve , McCall Ryan , Baars Bernard 
Published: July 2013

Abstract
Significant debate on fundamental issues remains in the subfields of cognitive science, including perception, memory, attention, action selection, learning, and others. Psychology, neuroscience, and artificial intelligence each contribute alternative and sometimes conflicting perspectives on the supervening problem of artificial general intelligence (AGI). Current efforts toward a broad-based, systems-level model of minds cannot await theoretical convergence in each of the relevant subfields. Such work therefore requires the formulation of tentative hypotheses, based on current knowledge, that serve to connect cognitive functions into a theoretical framework for the study of the mind. We term such hypotheses “conceptual commitments” and describe the hypotheses underlying one such model, the Learning Intelligent Distribution Agent (LIDA) Model. Our intention is to initiate a discussion among AGI researchers about which conceptual commitments are essential, or particularly useful, toward creating AGI agents.
The Control of Codling Moth (Cydia Pomonella L.) Population Using Mating Disruption Method
Authors: Płuciennik Zofia 
Published: July 2013

Abstract
The series of experiments on codling moth (Cydia pomonella L.) control using mating disruption method were conducted in three experimental orchards during 2006-2010 growing seasons. The efficacy of two commercial pheromone preparations: Ecodian CP and Isomate CTT, in comparison to pesticides Calypso 480 SC and Appeal 04 PA, was evaluated on the base of percentage of damaged fruits, number of caterpillars collected during their migration for overwintering in bands of corrugated cardboard placed on tree trunk and number of moths caught in pheromone traps. Two thousands dispensers of Ecodian CP were used twice a season (at 6-week interval) on the area of 1 ha of the orchard. Five hundred of Isomate CTT dispensers were applied once a season on 1 ha of the orchard. In all the experiments, application of mating disruption method significantly reduced the level of apple damage; the control efficacy (calculated according to Abbott’s formula) ranged from 54.2% to 95.8%. The efficacy of chemical control ranged from 58.5% to 93.0%. The lower efficacy of mating disruption method was noticed in orchards with high codling moth population. The treatments also affected the number of caterpillars caught in bands of corrugated cardboard placed on tree trunk. In experiments where the codling moth was not controlled, the number of caterpillars per a band varied from 0.2 to 11.9 whereas in these where the pest was controlled chemically or by mating disruption method, their number varied from 1.4 to 2.8 specimens.
The Characteristics of Fruits Morphology, Chemical Composition and Colour Changes in Must During Maceration of Three Grapevine Cultivars
Authors: Ochmian Ireneusz , Angelov Ludmil , Chełpiński Piotr , Stalev Bojan , Rozwarski Rafał , Dobrowolska Agnieszka 
Published: July 2013

Abstract
The study compares morphology of clusters and fruits, the chemical composition and changes of pulp in the process of maceration of grape cultivars ‘Mavrud’, ‘Pinot Noir’ and ‘Merlot’. The cultivar ‘Mavrud’ had biggest clusters and fruits. Its fruits were less firm but had the highest acidity while the fruits of the ‘Pinot Noir’ had the highest content of soluble solids and dry matter and the greatest firmness but the lowest acidity and content of nitrites and nitrates. The fruits of the ‘Merlot’ cultivar had the highest content of L-ascorbic acid, nitrites and nitrates. The pulp colour was largely affected by the maceration temperature. During a warm maceration, the process of pulp darkening accelerated and the red colour saturation increased, whereas cold maceration resulted in the blue colour saturation.
Urban Shrinkage as a Challenge to Local Development Planning in Slovakia
Authors: Buček Ján , Bleha Branislav 
Published: July 2013

Abstract
The demographic characteristics of "shrinking" processes in large Slovak cities, as well as the awareness of such shrinkage processes in local development planning, is the subject of this article. Population loss, together with other demographic indicators, clearly documents such a trajectory in urban development. In spite of this reality, there is only limited reflection of the "shrinking" in planning documents of cities approved by town councils. Some reasons for this decreased sensitivity to the complex problem of shrinking cities include missing relevant information (e.g. demographic prognoses), the milder forms of "shrinking" in Slovakia, the absence of political acceptance of the process by local elites, and the dominant-growth oriented planning practices.
A Dynamic Approach to the Typology of Functional Derelict Areas (Sosnowiec, Poland)
Authors: Krzysztofik Robert , Kantor-Pietraga Iwona , Spórna Tomasz 
Published: July 2013

Abstract
The increasing number of wastelands in East-central European countries is primarily a consequence of functional transformations and movements in the structure of employment. Taking into account such a challenge in this article, the authors propose an approach in which the basic category is a typological proposal with reference to areas with derelict functions, which in turn refers to research within the scope of human geography. In their methodological proposal, the authors consider such variables as: (i) the diversification of management and use of space; (ii) time; (iii) economic functions; and (iv) the scope of geographic research. The effect of including these variables is an attempt to dynamically depict the evolution of land use, with particular attention paid to wasteland: original state - transitional state (derelict areas) - present state. The typological depiction of the emergence and transformation of areas with derelict functions is presented for the case of Sosnowiec.
The Spatial Pattern of Brownfields and Characteristics of Redeveloped Sites in the Ostrava Metropolitan Area (Czech Republic)
Authors: Novosák Jiří , Hájek Oldřich , Nekolová Jana , Bednář Pavel 
Published: July 2013

Abstract
Differences between brownfields and redeveloped sites in the Ostrava metropolitan area are subject to analysis in this paper. Environmental burden and former functional use were identified as statistically significant characteristics of such differences. In addition, relations between selected attributes of brownfields and redeveloped sites were analyzed using the “if-then” decision rules of the rough set method. In this way, the research demonstrated the significance of spatial aspects and identified two fundamental types of brownfields in the model area. The first type is represented by agricultural brownfields in the hinterland zone, that are characterized by a complicated ownership structure. Brownfields of the second type are located particularly in the inner city morphogenetic zone, and are characterized by potential problems with environmental burden. In this context, brownfields and redeveloped sites differ respectively in the combination of these characteristics.
Various Aspects of the Genesis and Perspectives on Agricultural Brownfields in the Czech Republic
Authors: Skála Jan , Vácha Radim , Čechmánková Jarmila , Horváthová Viera 
Published: July 2013

Abstract
Abandoned agricultural objects from the period of large-scale agricultural production in the socialist era represent a peculiar topic in the former communist countries of Eastern Europe, surpassing the experience of the EU15 countries or USA that have extensive and long-standing practice in brownfields redevelopment. The question of brownfields resulting from the transformation of the agricultural sector during the transition period of the Czech Republic is presented in this paper. Agricultural brownfields are the most frequently occurring brownfields in the Czech Republic (especially in some regions), but their area share is much lower, indicating their spatial disposition in the landscape. Some aspects of agricultural brownfields regeneration, including possibilities of its funding, are discussed in the paper. We also deal with geographical, environmental and historical aspects of the existence of these localities in the Czech Republic in the context of potential financial resources and possibilities for funding their revitalization.
Rebranding Development Communications in Emergent India
Authors: Chakravartty Paula 
Published: July 2013

Abstract
With access to and competence in new ICTs a defining feature of modern citizenship in much of the global South, we need to understand the complex and ambivalent discourse around public-private partnerships, digital inclusion and the very rebranding of development communication in the 21st century. India’s prominence in this area is partially explained by the economic and symbolic success of its export-oriented IT industry. The spectacular nature of economic disparities in the world’s largest democracy - an emerging market vying for global recognition with some of the most severe rural poverty rates worldwide - has meant that private sector actors are increasingly eager to present themselves as active participants in a new discourse of development. In unequal information societies across the global South like India, a critical analysis of corporate actors in the development arena must take into account the wider field of conflict and struggle over the redistribution of public resources evident in the era of liberalization.
Communication for Development in Good and Difficult Times
Authors: Balit Silvia 
Published: July 2013

Abstract
The article tells the story of the evolution of communication for development within the United Nation’s (UN) Food and Agriculture Organisation (FAO), describing the good times in the past as well as the difficult times in the last decade as an example of how the discipline continues to be marginalised in development institutions. The author argues that new challenges and trends demand new thinking on the part of institutions and governments, as well as new practices and skills by communication practitioners, and stresses the need to avoid re-inventing the wheel. New approaches should be married up with the participatory principles and methodologies applied in the past that are still valid for meeting the new challenges. The article concludes with a discussion of the prerequisites for an enabling environment for mainstreaming communication for development.
The Globalization of the Pavement
Authors: Ekström Ylva , Hansen Anders Høg , Boothby Hugo 
Published: July 2013

Abstract
This article investigates examples of citizen media production and communication (blogs and social media sites in Tanzania and its diasporas) in the immediate aftermath of the Gongo la Mboto blasts in Dar es Salaam, Tanzania, February 2011.
At the centre is the relationship between media use and communication practices of the pavement - drawing from the notion of pavement radio - and the spaceship, i.e. a metaphor for traditional mass media, exemplified by policies and practices of the BBC and its World Service.
We argue that new social media practices as digital pavement radio are converging with traditional forms of street buzz and media use. Forms of oral communication are adapting towards the digital and filling information voids in an informal economy of news and stories in which media practices are stimulated by already ingrained traditions. An existing oral culture is paving the way for a globalization of the pavement.
Social Entrepreneurship and Communication for Development and Social Change
Authors: McAnany Emile G. 
Published: July 2013

Abstract
This article argues that social entrepreneurship has not yet been adequately defined even though it is increasingly being used in social change/development practice. Muhammad Yunus, creator of the Grameen Bank and microlending, and Bill Drayton, founder of the global change agency Ashoka, have practiced social change through social entrepreneurship for more than 30 years. Increasingly, the development community has been adopting many of its practices. The basic process of social entrepreneurship involves: defining a social goal for the solution of a serious problem; innovation in solving the problem; ability to expand the organization to serve large numbers of people (scaling up); focusing on the social bottom line with empirical evidence (impact evaluation). Three cases are briefly reviewed to illustrate this process. Finally the article examines how these practices might help Communication for Development (C4D) to better adapt its own practices in achieving real change with people.
“Nobody has 257 Friends”
Authors: Linaa Jensen Jakob , Scott Sørensen Anne 
Published: July 2013

Abstract
In the present article, we discuss norms of friendship and privacy on social network sites by examining strategies of privacy among users, arguing that tacit norms of friendship are now more easily observed. The article is based on a quantitative survey among 1710 Internet users in Denmark, among them 970 Facebook users, subsequent focus group meetings with 20 respondents and finally access to their profiles for a period of twelve months. In line with the research literature on social network sites, our study shows that users’ “friends” consist of a variety of strong, weak and even latent ties and thus supports notions such as social divergence and networked publics, suggested by danah boyd. Regarding privacy issues, we distinguish between level of access to information on participants’ profiles and the way participants perform on their profiles, the level of intimacy. As to the first level most respondents seem to emphasize whom they friend, while they do not distinguish among friends once they are in; everybody is treated equally. As to the second level, our research deviates from findings suggesting that in particular young people are rather unaware of risks, as we can identify what we call a “cautious sensible” strategy in all age groups that allows users to be cautious without being too self-restrictive. Regarding the status updates, we identify a schism between saying and doing, as our respondents tend to downgrade small talk in the focus groups, whereas their profiles reveal that they in fact do engage in small talk. We understand this seeming paradox in a generic and linguistic perspective, using the notions of phatic and indexical communication, respectively, in an analysis of the status updates on the profiles.
Quench dynamics in spin crossover induced by high pressure
Authors: Nesterov Alexander , Ovchinnikov Sergey , Iaroshenko Grigorii 
Published: July 2013

AbstractIn this paper we have analytically and numerically studied the dynamics of spin crossover induced by time-dependent pressure. We show that quasi static pressure, with a slow dependence on time, yields a spin crossover leading to transition from the high spin (HS) quantum system state to the low spin (LS) state. However, quench dynamics under shockwave load are more complicated. The final state of the system depends on the amplitude and pulse velocity, resulting in the mixture of the HS and LS states.
Preliminary environmental historical results to reconstruct prehistoric human-environmental interactions in Eastern Hungary
Authors: Salisbury Roderick , Bácsmegi Gábor , Sümegi Pál 
Published: July 2013

AbstractPalaeoenvironmental research is playing an important role in recent archaeological investigations. We present preliminary results of geoarchaeological analyses conducted at a palaeochannel located between two prehistoric archaeological sites in eastern Hungary. The study area lies within the Körös River Basin in Békés County, a region of intensive human occupation beginning in the Neolithic, ca. 7550 BP, and represents only the second palynological analysis done in conjunction with archaeological investigations and adjacent to an archaeological site in the Körös region. Pollen from an environmental monolith was used to reconstruct the local vegetation composition and the human impact on arboreal and non-arboreal vegetation near the archaeological sites. Sediment analyses helped to reconstruct hydrological activity and human impact on the local palaeochannel. Results indicate that activity from the Neolithic onwards played an important role in local environmental change, including increasing sedimentation and deposition of organic matter in the local waterway, some forest clearance and a shift from primarily arboreal vegetation to more grasses on elevated surfaces. The trophic status of the local channel changed several times during the Holocene. In addition, indications that groundwater levels may have been fluctuating during the period of human occupation, when combined with the other changes in the area, provide a possible partial explanation for changing settlement patterns.