bluuebunny/crossref_metadata_2025_split huggingface dataset:
Volatility and Co‑movement: an Analysis of Food Commodity Prices in Nigeria
Authors: Ogunmola Omotoso Oluseye , Obayelu Abiodun Elijah , Akinbode Sakiru Oladele 
Published: January 2018

Abstract
This study explains volatility as a measure and interaction of the possible movement in a particular economic variable. Prices change rapidly in adjustment to market circumstances. Food prices hike experienced overyears has resulted in widespread menace which led to increase in food price volatility. However, volatility and co-movement had generally been lower for the past two decades than for the previous ones. Wide price movements over a short period of time connote high volatility, rendering the producers and consumers vulnerable. Excess volatility can be subjected to sector ineffectiveness and is commodity specific. Producers and processors are mostly concerned about increased price volatility, which greatly exposed them to unpredictable risks and uncertainty associated with price changes. This study examined the volatility and co-movement of food commodity prices in Nigeria using price series data on rice, maize, sorghum, cassava and yam for the period of 1966 to 2013. The data were analysed using Vector Autoregressive Model to forecast food price volatility and to examine the food commodity prices that Granger cause food price volatility in other food commodities. The GARCH regression model is used to estimate the magnitude of volatility which revealed that, food commodity prices exhibit high volatility and there is persistent increase in prices over the period of study. The Nigerian food commodity prices have experienced high fluctuations over the period; therefore, the study recommends proper storage facilities and infrastructure for the food distribution corporations in Nigeria.
Modelling and Control of Bounded Hybrid Systems in Power Electronics
Authors: Fehér Áron , Kutasi Dénes Nimród 
Published: January 2018

Abstract
In this work, an explicit Model Predictive Control algorithm is devised and compared to classical control algorithms applied to a series resonant DC/DC converter circuit. In the first part, a model of the converter as a hybrid system is created and studied. In the second part, the predictive algorithm is applied and tested on the model. Finally, the designed control algorithm is compared to classical PI and sliding mode controllers.
The Flux of Transmigrant Identities in Thomas Arslan’sBrothers and Sisters
Authors: Bátori Anna 
Published: January 2018

AbstractThe paper investigatesBrothers and Sisters(Geschwister-Kardeşler,1995), the first piece of Thomas Arslan’s Berlin-trilogy. While putting the film into the socio-historical context of the newly united German Republic, the study aims to highlight the characters’ struggle and constant shift between their Turkish and German identity. Through the narrative and textual analysis ofBrothers and Sisters, the paper reveals the visual forms of social exclusion and concludes that in Arslan’s film, the characters bear with no social identity but various stages of identification, which keep them in an in-between, insecure position.
Collective Cultural Memory as a TV Guide: “Living” History and Nostalgia on the Digital Television Platform
Authors: Hagedoorn Berber 
Published: January 2018

AbstractModern audiences engage with representations of the past in a particular way via the medium of television, negotiating a shared understanding of the past. This is evidenced by the increasing popularity of reboots, newly developed history and documentary programming, re-use of archival footage and nostalgia content. This article takes a closer look at television’s abilities to circulate and contextualize the past in the current era of convergence through narrowcasting or niche programming on digital television platforms, specifically via nostalgia programming. Such platforms exemplify the multifaceted way of looking at and gaining access to television programming through a variety of connected platforms and screens in the current multi-platform era. Since the way in which television professionals (producers, schedulers, commissioners, researchers) act as moderators in this process needs to be further analysed, the article places an emphasis on how meaningful connections via previously broadcast history and nostalgia programming are also curated, principally through scheduling and production practices for niche programming – key elements in television’s creative process that have received less academic attention. Furthermore, the article discusses to what extent media policy in the Netherlands is attuned to the (re-)circulation of previously broadcast content and programming about past events, and reflects on television’s possibilities for “re-screening” references to the past in the contemporary media landscape. The analysis is based on a combination of textual analysis of audio-visual archival content and a production studies approach of interviews with key professionals, to gain insight into the creators’ strategies in relation to nostalgia programming and scheduling. Subsequently, the article demonstrates how national collective memory, as understood by television professionals in the Netherlands, informs the scheduling and circulation of “living history” on the digital thematic channel – collective cultural memory hence functioning as a TV guide.
Improvement of Growth and Yield of Maize (Zea mays L.) by Poultry Manure, Maize Variety and Plant Population
Authors: Kareem I. , Jawando O.B. , Eifediyi E.K. , Bello W.B. , Oladosu Y. 
Published: January 2018

Abstract
Soils of the savannah zones of Nigeria are low in plant nutrients and peasant farmers; therefore, rely on external inputs in the form of organic and inorganic manure for sustainable yield. They also sow their seeds at suboptimal plant population density, thereby providing opportunity for weeds to thrive. Moreover, farmers use saved seeds from the previous cropping season for planting, which often results in low yield. A study was conducted to assess the growth and yield of two maize cultivars under the influence of organic fertilizer and plant population density. Treatments used were factorial combinations of three levels of poultry manure (0, 2.5, 5.0 t/ha), two population densities (95,556 and 53,333 plants/ha) and two maize varieties (DMR-ESR-Y and Suwan-1-SR). Data were collected on number of leaves, plant height, leaf area, stem girth, root and shoot dry weight, total dry weight, days to tasseling, days to silk appearance, grain yield per hectare, number of seeds per cob, seed rows per cob, weight of 100 seeds and shelling percentage. The results revealed significant improvement (p≤ 0.05) in all parameters examined, when 5 t/ha poultry manure was applied to Suwan-1-SR at density 53,333 plants/ha. However, there was marginal difference between 5 and 2.5 t/ha in grain production. Therefore, application of 2.5 t/ha poultry manure for production of Suwan-1-SR maize variety at plant density 53,333 plants/ha could be used for getting optimum yield, that can feed the growing population of maize consumers coupled with better straw production for animal feed.
Carbonylation of Dimethyl Ether on Ag/ Cs1.5H1.5PW12O40: In-Situ FTIR Spectroscopy Study of the Ag-Carbonyls
Authors: Volkova G.G. , Paukshtis E.A. 
Published: January 2018

AbstractHalide-free carbonylation of dimethyl ether (DME) to methyl acetate over heterogeneous catalysts offers a potentially green route to the production of important industrial chemicals. Previously we have shown that the addition of 1% of silver to Cs1.5H1.5PW12O40led to an increase in activity by a factor of two. Formation of silver carbonyl clusters on the surface of the catalyst was demonstrated by in situ FTIR spectroscopy. The v(CO) of silver carbonyl was observed at 2188 cm-1 and may be explained by the formation of cationic silver carbonyl Ag(CO)+on the surface of the acidic cesium salt of 12-tungstophosphoric acid. In view of the increased efficiency, the novel bifunctional catalyst Ag/ Cs1.5H1.5PW12O40is expected to hold significant promise for practical use in new processes of basic organic chemistry.
Affect and Dialogue in Collaborative Cross- Disciplinary Research: Developing Interactive Public Art on Cardiff Bay Barrage
Authors: Entwistle Alice , Burrows Inga , Carroll Fiona , Thomas Nathan , Ware Mark , Loudon Gareth 
Published: January 2018

AbstractWhere Cartesian philosophy distinguishes the perceiving and perceptual mind from the body, phenomenology constitutes the experiential/experiencing body as the subject, giving rise to the affective potential of art. An immersive world of digital connections, smart cities and the Internet of Everything dramatises the centrality of relationship, the intertwining of Self and Other, in the lived environments of human experience. This article addresses the contextual, disciplinary and practical challenges encountered in developing an ambitious interactive public art project embedding SMART technology on the coastal fringes of Cardiff, the capital city of Wales (UK). It examines the processes and problems involved in delivering a stimulating aesthetic experience in and on a complex site, for a complex audience profile. It traces, in particular, the dependence of a multi-disciplinary project team on the theoretical and practical effects of affect in their ongoing effort to produce engaging, provocative, socially inclusive interactive public art, in and through human-centred design techniques.
The Photovoltaic Installation Application in the Public Utility Building
Authors: Piotrowska-Woroniak Joanna 
Published: January 2018

Abstract
The article presents the use of photovoltaic installation in a building with office space and a section for kindergarten to support the production of electricity using solar energy. Accepted technological installation solution, capital expenditures to be incurred for the project and payback time are shown. Paper presents the results of the performance simulation of the PV system adopted depending on the angle of photovoltaic panels. Designed photovoltaic installation consists of 62 panels with a total nominal power of 15.5 kW. The use of photovoltaics in the facility allow reducing carbon dioxide emissions into the atmosphere by approximately 52%. In Poland, most of the electricity produced is still based on coal and lignite. Photovoltaics is one of the renewable sources of energy, so-called “Green” energy. The investment could be made thanks to the Regional Operational Programme Podlaski, Activity 5.2 Development of local infrastructure, environmental protection 2007-2013.
Microbiological and Energetic Assessment of the Effects of the Biodrying of Fuel Produced from Waste
Authors: Malinowski Mateusz , Wolny-Koładka Katarzyna 
Published: January 2018

Abstract
Biological drying (biodrying) is one of the methods of biological processing of waste, used mainly as part of the mechanical biological treatment of mixed municipal waste. Biological drying uses the heat released during the decomposition of organic matter to reduce the amount of water in dried waste. The aim of the analyses was to provide a microbiological and energetic (fuel) assessment of the process of biodrying of alternative fuel (RDF) obtained by mechanical sorting of mixed municipal waste. The resulting alternative fuel (obtained with just sorting) is characterised by varied moisture content and the presence of diverse groups of microorganisms. The analyses were intended to assess 3 alternative methods of biodrying of alternative fuel in order to produce a stable end product for utility power generation and the cement industry. The analyses were performed using special bioreactors equipped with custom (innovative) fluidised bed, aeration system (air flow rate 500 m3 · h−1), effluents drain systems, post-process air offtake and 4 temperature sensors. The assessment of the impact of the employed bed aeration methods on the quality of the alternative fuel was performed in 3 repetitions with the same external parameters. The obtained results show that after 8 days of biodrying, in the most favourable option, the moisture content in the fuel was reduced to the level of 18.7%, i.e. by 39%, the resulting fuel was microbiologically stable and the calorific value of the fuel was increased on average by 3.2 MJ · kg−1.
The Impact of Copper Ions on Oxidative Stress in Garden Cress Lepidium sativum
Authors: Rombel-Bryzek Agnieszka , Rajfur Małgorzata , Zhuk Olga 
Published: January 2018

Abstract
Normal oxygen metabolism is an endogenous source of reactive oxygen species (ROS). The source of ROS are also many environmental factors including heavy metals. In certain concentration range, the presence of ROS is necessary to maintain proper cell function. Thus, cells have many mechanisms, which role is focused on maintaining a constant concentration of ROS. Imbalance between the formation of ROS and action of a protective antioxidant system leads to oxidative stress. This may results with a damage to the structure of proteins, lipids and nucleic acids, which in turn can lead to disturbances in the functioning of the cell and even to the death. The aim of the study was to evaluate the effect of copper ions on the metabolic activity of garden cress Lepidium sativum L. The action of copper ions with different concentrations was treated seeds. After four, six and eight days after planting in the leaves of garden cress were determined the specific activity of guaiacol peroxidase (GPOX), lipid peroxidation and protein content. Additionally intake of copper ions was determined using adsorption spectrometry technique. The results revealed that the applied doses of copper ions affected the activity of guaiacol peroxidase. The highest enzyme activity was found in plant material, which was treated with dose of copper ions 1000 mg/dm3 regardless of day. In the same samples the lowest level of lipid peroxidation was found. The highest concentrations of total proteins was found in samples treated with the highest dose of copper ions. The copper content in the tested plant material is correlated with the applied dose of copper ions. Our results indicate reliable correlations between copper content and values of oxidative stress biomarkers in plant tissues.
Learners on the Periphery: Lurkers as Invisible Learners
Authors: Honeychurch Sarah , Bozkurt Aras , Singh Lenandlar , Koutropoulos Apostolos 
Published: January 2018

AbstractLurkers, who are also known as silent learners, observers, browsers, read-only participants, vicarious learners, free-riders, witness learners, or legitimate peripheral participants (our preferred term), tend to be hard to track in a course because of their near invisibility. We decided to address this issue and to examine the perceptions that lurkers have of their behaviour by looking at one specific online learning course: CLMOOC. In order to do this, we used a mixed methods approach and collected our data via social network analysis, online questionnaires, and observations, including definitions from the lurkers of what they thought lurking was. We then analysed the data by using social network and content analyses and interpreted the research findings using the concept Community of Practice, with the Pareto Principle used to delimit types of learner. Our research findings revealed that lurking is a complex behaviour, or set of behaviours, and there isn’t one sole reason why lurkers act the ways that they do in their respective communities. We concluded that for a more participatory community the more active, experienced or visible community members could develop strategies to encourage lurkers to become more active and to make the journey from the periphery to the core of the community.
Modeling of Waves Propagating in Water with a Crushed Ice Layer on the Free Surface
Authors: Szmidt Kazimierz 
Published: January 2018

Abstract
A transformation of gravitational waves in fluid of constant depth with a crushed ice layer floating on the free fluid surface is considered. The propagating waves undergo a slight damping along their path of propagation. The main goal of the study is to construct an approximate descriptive model of this phenomenon.With regard to small displacements of the free surface, a viscous type model of damping is considered, which corresponds to a continuous distribution of dash-pots at the free surface of the fluid. A constant parameter of the dampers is assumed in advance as known parameter of damping. This parameter may be obtained by means of experiments in a laboratory flume.
Relation Between Human System Safety Management and Environmental Management
Authors: Procházková Dana , Rusko Miroslav 
Published: January 2018

Abstract
Security situation in the world, in each territory and generally in each asset, continuously changes with time, and therefore, there is formed new safety culture that takes into account actual knowledge and experiences with interdependences among the public assets leading to extreme social crises. With regard to the historical development at present there are lots of management types that differ by aims and by assets that they respect. Consecutively in present human society there are groups that shielded by individual management type aims fight against each other, and at the same time all of them goes on good human existence. The paper deals with the relation between human system safety management and environmental management.
Effects of CO2 on the Organism Depending on its Concentration
Authors: Kizeková Marianna , Rusňáková Viera , Legáth Ľubomír 
Published: January 2018

Abstract
Carbon dioxide (CO2) may have toxic effects at concentrations much lower than the concentration at which its stifling effect of asphyxiant is reflected. In the workplace, the maximum permissible exposure limit of 5000 ppm is permitted on the average. However, there are certain places where the concentration of CO2 in an enclosed room or area may potentially reach extreme and life-threatening levels. Extreme levels of CO2 may lead to death, especially in enclosed spaces, such as in fermentation rooms or in the process of wine production or in breweries. CO2 may have negative effects on health and safety at the workplace. Monitoring and control of CO2 in the working environment is important for the safety and health of employees and is one of the approaches to a healthier environment in the workplace. The use of CO2 sensors to control the ventilation can be an effective measure.
A criterion for metanilpotency of a finite group
Authors: Bastos Raimundo , Monetta Carmine , Shumyatsky Pavel 
Published: January 2018

Abstract
We prove that the kth term of the lower central series of a finite group G is nilpotent if and only if

|

a
⁢
b

|

=

|
a
|

⁢

|
b
|

{|ab|=|a||b|}

for any

γ
k

{\gamma_{k}}

-commutators

a
,
b

∈
G

{a,b\in G}

of coprime orders.
In Vitro Proliferation and Cryoconservation of Banana and Plantain Elite Clones
Authors: Reyes Guillermo , García José , Piña Fernando , Mendoza Joffre , Sosa Daynet , Noceda Carlos , Blasco Miquel , Flores José 
Published: January 2018

Abstract
Agriculture and modern biotechnology are increasingly becoming interdependent, and many new techniques have brought new opportunities for enhancing production and marketing. Germplasm storage is an alternative for the conservation of plant genetic diversity, contributing to the improvement and maintenance of propagation programs for species of interest. In this work, banana corms were collected as plant material from relatively young commercial plantations of three different cultivars: ‘Williams’, Valery (AAA genome; Cavendish subgroup), and ‘Barraganete’ (AAB genome; Plantain subgroup). Their shoot tips were introduced into in vitro conditions, and subcultured monthly to obtain the required number of shoots. The shoots were subsequently rooted and stimulated to invigoration in order to extract apical meristems (0.8–1.0 mm), which were prepared for cryopreservion in liquid nitrogen (−196 °C) following pre-conditioning in PVS2 vitrification solution. Thereafter, the explants were rapidly thawed and then recovered and regenerated using two different methods – by Panis (2009) and Korneva et al. (2009) – consisting of two different sets of recovery and subsequent regeneration media. Statistical analysis of the results showed that the banana cultivar ‘Williams’ demonstrated higher survival and regeneration rates after cry-opreservation using the Korneva method, whereas in cultivars ‘Valery’ and ‘Barraganete’, there were no significant differences between the tested methods. The ‘Barraganete’ cultivar had the lowest survival and regeneration rates, regardless of the applied method.
Holonomicity analysis of electromechanical systems
Authors: Wcislik Miroslaw , Suchenia Karol 
Published: January 2018

Abstract
Electromechanical systems are described using state variables that contain electrical and mechanical components. The equations of motion, both electrical and mechanical, describe the relationships between these components. These equations are obtained using Lagrange functions. On the basis of the function and Lagrange - d’Alembert equation the methodology of obtaining equations for electromechanical systems was presented, together with a discussion of the nonholonomicity of these systems. The electromechanical system in the form of a single-phase reluctance motor was used to verify the presented method. Mechanical system was built as a system, which can oscillate as the element of physical pendulum. On the base of the pendulum oscillation, parameters of the electromechanical system were defined. The identification of the motor electric parameters as a function of the rotation angle was carried out. In this paper the characteristics and motion equations parameters of the motor are presented. The parameters of the motion equations obtained from the experiment and from the second order Lagrange equations are compared.
Sport, Disability, and Women: A Study of Organised Swedish Disability Sport in 1969-2012
Authors: Wanneberg Pia Lundquist 
Published: January 2018

Abstract

Introduction
. The purpose of this article is first to provide a picture of disability sport in general and second to increase knowledge of sport for women with disabilities.

Material and methods
. The study method is a qualitative text analysis of organised Swedish disability sport and of media reporting of the Paralympics. The study begins in 1969, the year when the Swedish Sports Organization for the Disabled (SHIF) was formed, and continues until the Summer Paralympics in 2012. The theory is based on three conceptual pairs: integration and inclusion, the medical and social models, and the traditional and progressive models of media coverage.

Results
. The results show that SHIF strove principally not for inclusion but for integration. Further, women in SHIF led a hidden existence, except for the period between the end of the 1970s and the beginning of the 1980s, when initiatives were taken to improve their position. In other respects, this was a non-issue. Moreover, the medical model was dominant, and sport was viewed above all as rehabilitating. Finally, mainstream media reporting was traditional, namely Paralympic participants were portrayed first and foremost as people with disabilities and secondarily as sports practitioners.

Conclusion
. Swedish disability sport during this period was not included in the sports movement in general and integration work was, for the SHIF board, superordinate to the gender aspect.