bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Determinants of Morphology and Properties of the Nanohydroxyapatite Coating Deposited on the Ti13Zr13Nb Alloy by Electrophoretic Technique
Authors: Bartmański M. , Berk A. , Wójcik A. 
Published: October 2016

Abstract
The titanium and its alloys belong at present to the most preferred and commonly applied biomaterials for load-bearing implants. The surfaces of biomaterials are subjected to modification, including the hydroxyapatite coatings deposited in order to ensure corrosion resistance and better joining between an implant and a bone through the possibility of ingrowth bone into the coating. In this paper, the morphology and properties of the nanohydroxyapatite coating deposited on the Ti13Zr13Nb flat surfaces using electrophoretic method are presented. Electrophoretic deposition at two different current values and two electrolytes (first – ethanol with nanoHAp, second – methanol with nanoHAp) was applied. The scanning electron microscopy examinations and wettability angle measurements showed an increase in the coating thickness, the surface coverage and decrease in biocompatibility with increasing voltage. The surface condition and biocompatibility of coatings were better when using methanol/nanoHAp solution as compared to the ethanol/nanoHAp one.
Loads Acting on the Mine Conveyance Attachments and Tail Ropes during the Emergency Braking in the Event of an Overtravel
Authors: Wolny Stanisław 
Published: October 2016

Abstract
It has now become the common practice among the design engineers that in dimensioning of structural components of conveyances, particularly the load bearing elements, they mostly use methods that do not enable the predictions of their service life, instead they rely on determining the safety factor related to the static loads exclusively.
In order to solve the problem, i.e. to derive and verify the key relationships needed to determine the fatigue endurance of structural elements of conveyances expressed in the function of time and taking into account the type of hoisting gear, it is required that the values of all loads acting upon the conveyance should be determined, including those experienced under the emergency conditions, for instance during the braking phase in the event of overtravel.
This study relies on the results of dynamic analysis of a hoisting installation during the braking phase when the conveyance approaches the topmost or lowermost levels.
For the assumed model of the system, the equations of motion are derived for the hoisting and tail rope elements and for the elastic strings. The section of the hoisting rope between the full conveyance approaching the top station and the Keope pulley is substituted by a spring with the constant elasticity coefficient, equal to that of the rope section at the instant the conveyance begins the underwind travel.
Recalling the solution to the wave equation, analytical formulas are provided expressing the displacements of any cross-profiles of hoisting and tail ropes, including the conveyance attachments and tail ropes, in the function of braking forces applied to conveyances in the overtravel path and operational parameters of the hoisting gear. Besides, approximate formulas are provided yielding:

–loading of the hoisting rope segment between the conveyance braking in the headgear tower and the Keope pulley
–deceleration of the conveyance during the braking phase.
The results will be utilised to derive the function governing the conveyance load variations during the emergency braking, depending on the parameters of the hoisting installations and the braking systems. These relationships are required for adequate design of the frictional contact between the ropes and the pulley and will become the basic criteria for dimensioning and design of load-bearing components of conveyances in the context of improving their reliability and safety features.
Comparison of Conventional Sprocket Drum and Sprocket Drum with Modified Design
Authors: Sobota Piotr 
Published: October 2016

Abstract
Seats in conventional sprocket drums are symmetrical. Due to the set general direction of sprocket drum revolutions resulting from the direction of rock transport, the wear of the seat bottoms and teeth flanks may be reduced by introducing the asymmetry of the profile of the sprocket drum seats. The proposed modification of sprocket drum seats’ profile consists of inclining the seat bottom towards the expected direction of the basic drum revolutions.
The work compares the loads on the seats and teeth of a conventional drum with its profile conforming to the standard to a modified drum with an asymmetric profile of seats. For the general direction of sprocket drum revolutions, the maximum values of all forces are higher for a standard drum than for a modified drum. The profile asymmetry substantially shortens the friction path of the horizontal link front torus on the seat bottom and relative total friction work on the seat bottom and lessens the occurrence probability of the slide of the horizontal link rear torus on the tooth flank. The modification of the profile causes also the asymmetric wear of link joints. The total relative friction work is considerably reduced in the front joint as compared to a conventional drum, and the total relative friction work in the rear joint is increasing at the same time.
The Use of the Visualisation of Multidimensional Data Using PCA to Evaluate Possibilities of the Division of Coal Samples Space Due to their Suitability for Fluidised Gasification
Authors: Jamróz Dariusz , Niedoba Tomasz , Surowiak Agnieszka , Tumidajski Tadeusz 
Published: October 2016

AbstractMethods serving to visualise multidimensional data through the transformation of multidimensional space into two-dimensional space, enable to present the multidimensional data on the computer screen. Thanks to this, qualitative analysis of this data can be performed in the most natural way for humans, through the sense of sight. An example of such a method of multidimensional data visualisation is PCA (principal component analysis) method. This method was used in this work to present and analyse a set of seven-dimensional data (selected seven properties) describing coal samples obtained from Janina and Wieczorek coal mines. Coal from these mines was previously subjected to separation by means of a laboratory ring jig, consisting of ten rings. With 5 layers of both types of coal (with 2 rings each) were obtained in this way. It was decided to check if the method of multidimensional data visualisation enables to divide the space of such divided samples into areas with different suitability for the fluidised gasification process. To that end, the card of technological suitability of coal was used (Sobolewski et al., 2012; 2013), in which key, relevant and additional parameters, having effect on the gasification process, were described. As a result of analyses, it was stated that effective determination of coal samples suitability for the on-surface gasification process in a fluidised reactor is possible. The PCA method enables the visualisation of the optimal subspace containing the set requirements concerning the properties of coals intended for this process.
Mining Hazards Analysis with Simultaneous Mining Copper Ores and Salt Deposits in LGOM (Legnica-Głogów Copper Belt) Mines with Regard to Dynamic Influences
Authors: Kłeczek Zdzisław , Niedojadło Zygmunt , Popiołek Edward , Skobliński Wojciech , Sopata Paweł , Stoch Tomasz , Wójcik Artur , Zeljaś Dagmara 
Published: October 2016

Abstract
In the case of locating two bedded deposits of different mineral resources in a small vertical distance, additional or increased mining hazards can occur (deformations of the rock mass, crumps and mining shocks, hazards to the land surface). This paper has thoroughly examined the impact of exploitation of the lower-located deposit of copper ore on the higher-located deposit of salt as well as the reverse situation as regards the dynamic phenomena, being the greatest lithospheric hazard in LGOM. At the same time theoretical models of processes were applied, verified by previous observations in situ in mines of Legnica-Głogów Copper Belt.
Structurally Altered Hard Coal in the Areas of Tectonic Disturbances – An Initial Attempt at Classification
Authors: Godyń Katarzyna 
Published: October 2016

Abstract
As regards the exploitation of hard coal seams, the near-fault zones and faults themselves are considered to be particularly dangerous areas, which is due to a high probability of the occurrence of gasogeodynamic phenomena. Tectonic dislocations running across a seam have a destructive impact on coal. Degradation of the coal structure, particularly visible in the microscale, is reflected in the coal’s strength or gas properties. Such “structurally altered” coal is characterized by the presence of numerous fracturings, crushed areas, or dislocations of some of its fragments, and sometimes even the total destruction of the original structure. The present paper provides a detailed analysis and description of near-fault coal obtained from selected seams of the Upper Silesian Coal Basin, completed due to the application of optical methods. Both the type and the degree of changes in the structure of such coal were identified. On this basis, the author attempted to systematize the nomenclature used in relation to selected Upper Silesian hard coal seams, which, in turn, resulted in a proposed classification of the “altered structures” of the near-fault coal.
A Computer-aided Application for Modeling and Monitoring Operational and Maintenance Information in Mining Trucks
Authors: Nikulin Christopher , Ulloa Andres , Carmona Carlos , Creixell Werner 
Published: October 2016

Abstract
The combination of maintenance planning and key performance indicators are relevant to create a more holistic scenario of the mining activities. On the one hand, reliability and maintainability are system characteristics suitable for planning maintenance strategies. On the other hand, key performance indicators are suitable to analyze cost and resource consumption information about mining equipment. Nevertheless in practice, both approaches are modeled separately and frequently by different team-works of a mining company. With this in mind, a computer-aided application was conceived to drive with better efficacy the operational and maintenance strategy in a complex process where the equipment is in continuous movement such as the transportation process in an open-mine pit.
Assessment of Political Vulnerabilities on Security of Energy Supply in the Baltic States
Authors: Česnakas Giedrius , Jakštaitė Gerda , Juozaitis Justinas 
Published: October 2016

Abstract
The article argues that despite the evident link between political environment and security of energy supply, political elements are not sufficiently represented in contemporary scientific literature, namely in indexes that are designed for the assessment of security of energy supply. In an attempt to fill this gap, the article presents an innovative methodology for quantitative assessment of the political vulnerabilities on security of energy supply and applies it to the analysis of the Baltic States.
The proposed index determines the plausibility of the occurrence of threats of a political nature on the security of energy supply and defines it as political vulnerability. The application of index methodology to an analysis of the Baltic States has revealed that the overall political vulnerability on security of energy supply is the highest in Lithuania, considerably lower in Latvia, and the lowest in Estonia. The analysis has shown that political vulnerability has increased in Lithuania due to the closure of Ignalina NPP and an increase in energy import quantities from politically unstable countries, such as Russia. On the contrary, political vulnerabilities on the security of the energy supply have decreased in Latvia and Estonia due to the increase of consumption of indigenous energy. However, preliminary calculations show that political vulnerabilities should decrease considerably in 2015 in Lithuania due to the diversification of the natural gas supply.
Multiple-perspective Reorganisation of the Dairy sector: Mathematical Programming Approach
Authors: Kocjančič Tina , Žgajnar Jaka , Juvančič Luka 
Published: October 2016

AbstractBackground:Agriculture is a production system in which the economic principles of organisation act in mutual dependence with its ecological boundaries.Objectives:Building on this premise, the paper evaluates performance of a chosen agricultural production system (dairy production in Slovenia) from two complementary perspectives, the socio-economic and the biophysical.Methods/Approach:The latter is presented by means of emergy analysis, which is a system-based approach that measures the aggregate work of biosphere needed for the provision of goods or services in the units of solar energy joules. The novelty aspect of this paper is the introduction of emergy indicators into the standard socioeconomic optimisation model of the chosen agricultural production system. The optimisation model based on linear mathematical programming is designed to empirically investigate different alternatives to the sector’s reorganisation.Results:The results of the optimisation models suggest considerable restructuring of the sector and, consequently, large discrepancies in the sector’s performance.Conclusions:The results suggest that further expansion of organic production systems as a result of a stronger environmental focus in farm management would improve the sector from both, the socio-economic and the emergy perspective. Moreover, even pursuing certain socio-economic targets may improve the sector’s biophysical performance and lower pressure on the local environment.
Dynamic Portfolio Selection on Croatian Financial Markets: MGARCH Approach
Authors: Škrinjarić Tihana , Šego Boško 
Published: October 2016

Abstract

Background: Investors on financial markets are interested in finding trading strategies which could enable them to beat the market. They always look for best possibilities to achieve above-average returns and manage risks successfully. MGARCH methodology (Multivariate Generalized Autoregressive Conditional Heteroskedasticity) makes it possible to model changing risks and return dynamics on financial markets on a daily basis. The results could be used in order to enhance portfolio formation and restructuring over time.

Objectives: This study utilizes MGARCH methodology on Croatian financial markets in order to enhance portfolio selection on a daily basis. Methods/Approach: MGARCH methodology is applied to the stock market index CROBEX, the bond market index CROBIS and the kuna/euro exchange rate in order to model the co-movements of returns and risks on a daily basis. The estimation results are then used to form successful portfolios.

Results: Results indicate that using MGARCH methodology (the CCC and the DCC model) as guidance when forming and rebalancing a portfolio contributes to less portfolio volatility and greater cumulated returns compared to strategies which do not take this methodology into account.

Conclusions: It is advisable to use MGARCH methodology when forming and rebalancing portfolios in terms of portfolio selection.
Cost Efficiency of Banks in Croatia
Authors: Huljak Ivan 
Published: October 2016

Abstract
Foreign and larger banks in Croatia are generally considered to be more cost efficient compared with domestic and smaller banks. However, those views are often based on data from financial statements that can be misleading due to simultaneous consolidation process on the market and the existence of economies of scale. To contribute to the Croatian banking efficiency literature, we construct a panel of individual bank data for 1994-2014 period and conduct a frontier analysis to calculate bank specific X-efficiency. Our results suggest that efficiency scores depend on the cost definition as domestic and smaller banks are more efficient in managing administrative costs compared with foreign and larger banks but equally efficient in managing total costs. Results indicate that average bank relative efficiency increased on two occasions: one in the late 90s in the period of banking crisis and subsequent “market cleansing” and to a lesser extent in the period marked with financial crisis. Although the differences between bank cost efficiencies seem small, we conclude that the area is worth further research as significant gains in bank earnings could be achieved by increasing efficiency.
Measuring Dynamics of Risk and Performance of Sector Indices on Zagreb Stock Exchange
Authors: Škrinjarić Tihana 
Published: October 2016

Abstract
Investors are interested in sector diversification on stock markets among other important portfolio topics. This paper looks at five sector indices on Croatian capital market as an example of a small, relatively illiquid market. Sector indices have been constructed at the beginning of 2013 and since then there is a lack of studies, which focus on sector diversification on Zagreb Stock Exchange (ZSE). Thus, the purpose of this paper is to evaluate the recent dynamics of risk and performance of five sector indices on ZSE by employing MGARCH (Multivariate Generalized Autoregressive Conditional Heteroskedasticity) models empirically. Output from the analysis is used to form guidance for investors on Croatian capital market. The results indicate that in the observed period from February 4th 2013 to October 13th 2015 portfolios based on MGARCH methodology outperform other portfolios in terms return and risk. Thus, it is advisable to use this methodology when making portfolio selection.
Quality of Life Indicators in Selected European Countries: Hierarchical Cluster Analysis Approach
Authors: Žmuk Berislav 
Published: October 2016

Abstract
The average expected duration of human life is rising because of different reasons. On the other hand, not only the duration, but the quality of life level is important, too. The higher the quality of life level, the citizens’ happiness and satisfaction levels are higher, which has positive impact on the development and operating of an economy. The goal of this paper is to identify groups of European countries, using statistical hierarchical cluster analysis, by using the quality of life indicators, and to recognise differences in quality of life levels. The quality of life is measured by using seven different indicators. The conducted statistical hierarchical cluster analysis is based on the Ward’s clustering method, and squared Euclidean distances. The results of conducted statistical hierarchical cluster analysis enabled recognizing of three different groups of European countries: old European Union member states, new European Union members, and non-European Union member states. The analysis has revealed that the old European Union member states seem to have in average higher quality of life level than the new European Union member states. Furthermore, the European Union member states have in average higher quality of live level than non-European Union members do. The results indicate that quality of life levels and economic development levels are connected.
Mucocele of the appendix during pregnancy: What to do?
Authors: Martínez Franco Eva , Vallverdú Cartié Helena , Margarit Verano Montserrat , Méndez Paredes José Ramón , Gris Garriga Pere , Garrone Rosana 
Published: October 2016

Abstract
The term mucocele is simply defined as the macroscopic description of an appendix that is grossly distended by intraluminal accumulation of mucoid material. Its incidence ranges from 0.2% to 0.7% of all appendectomies and during pregnancy it is even less frequent. After a mucocele diagnosis, the selection of an adequate surgical method is, in general, very important. But during pregnancy it is an even more complicated decision because of the lack of experience and evidence on elective surgical treatments in pregnant women. We present a commentary based on a case of a low-grade appendiceal mucinous neoplasm of the appendix, found on an appendectomy specimen because of a mucocele in a second trimester pregnant woman.
Possibilities for the Creation of Beer Routes in Hungary: A Methodological and Practical Perspective
Authors: Csapó János , Wetzl Viktor 
Published: October 2016

Abstract
This study aims to analyse the possibilities and the potential for the establishment of beer tourism, one of the most recently valorised tourism products of global gastro tourism, and more importantly the creation and professional criteria of beer routes in Hungary. With a thorough investigation of the theoretical background of beer tourism and beer trails the authors try to collect those spatial perspectives which confirm our idea that Hungary is possessing adequate resources for the initiation of this new tourism product. We experienced that this area of tourism geography has not yet been researched thoroughly in the country, for which we make an attempt in this paper, using geographical and GIS methods, basically relying on the beer routes of Bavaria, Germany as good practices.
Study of Antioxidant Effects of Selected Types of Coffee
Authors: Hudáková J. , Marcinčáková D. , Legáth J. 
Published: October 2016

Abstract
Coffee is a rich source of dietary antioxidants which protects the human body against the effects of dangerous free radicals. The aim of this study was to determine and compare the antioxidant activity, content of total phenols and flavonoids in selected types of coffee with respect to the way of their processing. The individual coffees were investigated with regard to their origin and composition. The antioxidant effects were determined by the 2,2-diphenyl-1-picryl-hydrazyl (DPPH) radical scavenging assay. The content of total phenols was analysed by the Folin-Ciocalteu method and the content of flavonoids in the coffee extracts was determined by a colorimetric method. The highest antioxidant activity was exhibited by the extract of unroasted ground 100 % green coffee Arabica (89.55 %), and the high scavenging of free radicals was achieved also by the extracts of roasted ground 100 % coffees Arabica and Robusta. The highest levels of total phenols (77.54 µg.ml−1) and flavonoids (1.74 µg.ml−1) were measured in the extract of unroasted ground 100 % green coffee Arabica. High levels of these substances were found also in extracts of roasted ground 100 % coffees Arabica and Robusta. The lowest levels of total phenols (31.24 µg.ml−1) and flavonoids (0.91 µg.ml−1) were detected in the extract of instant coffee Arabica. The processing of coffee by roasting decreased the level of the investigated antioxidant components but considerably improved the taste and aroma, the properties that make coffee one of the most popular drinks in the world.
The Influence of Probiotics on Reproductive Parameters of Sows and Health of Their Sucklings
Authors: Link R. , Reichel P. , Kyzeková P. 
Published: October 2016

Abstract
Thirtytwo sows were included in the trial. They were divided into the experimental group (n = 16) and a control group (n = 16). The experimental group received 1.28 × 106
Bacillus subtilis and Bacillus licheniformis per gram of feed (400 ppm BioPlus 2B, Chr. Hansen, Denmark). The trial started 2 weeks before farrowing and lasted until weaning. No significant differences were revealed in the number of piglets born alive, stillborn or the number of weaned pigs between the two groups of sows. The wean-to-first service interval was not significantly different between the groups, but sows in the experimental group had earlier first services. The conception rate did not differ. Sows in the experimental group suffered from postpartum dysgalactia syndrome (PDS) less than sows in the control group. The suckling piglets in the experimental group of sows reached better weight on day 14 of the trial and this state persisted up to the end of the experiment. The differences in the weights of the experimental group and the control group were significant at the end of the trial (P < 0.01). The experimental piglets had significantly lower incidence of diarrhoea than those in the control group (P < 0.05).