bluuebunny/crossref_metadata_2025_split huggingface dataset:
Afforestation of cutaway peatlands: effect of wood ash on biomass formation and carbon balance
Authors: Ots Katri , Orru Mall , Tilk Mari , Kuura Leno , Aguraijuja Karin 
Published: May 2018

Abstract
Alternatives to the restoration of cutaway peatlands include afforestation, energy forests, agricultural production, wetland restoration (restoration of peataccumulating function), reed canary grass (energy mower) or wild berries (blueberry, cranberry) cultivation, protected area for birds, and artificial lakes. Investigations made in several countries suggest that one of the most promising ways of regenerating cutaway peatlands is afforestation. The re-vegetation of Estonian cutaway peat production fields is mainly the result of natural processes, which are generally very slow: vegetation covers only 10–20% of a peat field. Carbon dioxide is not bound anymore in cutaway peatlands where vegetation layer has been destroyed and therefore photosynthetical processes no more occur. Using biofuel ashes (wood ash, etc.) for the afforestation of cutaway peatlands helps to balance the content of nutrients in peat substrate, which improves the survival of planted seedlings and significantly increases bioproduction. Drained and mined peatlands have become a significant source of CO2 but stimulated woody biomass production can be helpful to balance CO2 emission from cutaway peatlands. Because of the limited resources of fossil fuels and negative impacts on the environment in recent decades alternative sources of energy have been actively looked for. In Scandinavia a lot of attention has been paid to finding possibilities for using biofuels. The situation in Estonia is that only very few types of ashes (for example certified oil shale fly ash with product name Enefix) have been founded to be suitable for utilization and have been used for recycling in agriculture.
A seismic source zone model for the seismic hazard assessment of Slovakia
Authors: Hók Jozef , Kysel Robert , Kováč Michal , Moczo Peter , Kristek Jozef , Kristeková Miriam , Šujan Martin 
Published: May 2018

Abstract
We present a new seismic source zone model for the seismic hazard assessment of Slovakia based on a new seismotectonic model of the territory of Slovakia and adjacent areas. The seismotectonic model has been developed using a new Slovak earthquake catalogue (SLOVEC 2011), successive division of the large-scale geological structures into tectonic regions, seismogeological domains and seismogenic structures. The main criteria for definitions of regions, domains and structures are the age of the last tectonic consolidation of geological structures, thickness of lithosphere, thickness of crust, geothermal conditions, current tectonic regime and seismic activity. The seismic source zones are presented on a 1:1,000,000 scale map.
Terrazzo floor from the Jewish Historical Institute in Warsaw – mineralogical characterization, conservation and impact of fire
Authors: Bartz Wojciech , Martusewicz Jacek 
Published: May 2018

Abstract
Samples of historical terrazzo floor from the Jewish Historical Institute in Warsaw, dated back to the thirties of the twentieth century, have been analysed. Investigations by polarised optical microscopy, scanning microscopy, powder X-ray diffraction and simultaneous thermal analysis were preformed. Based on the results obtained, it was concluded that terrazzo tiles were prepared on the basis of ordinary Portland cement and aggregate, dominated with crushed stone (marble, serpentinite, limestone and marl), accompanied by sparse quartz sand grains. The binding mass was colourised with the use of pigments containing iron ions. The occurrence of altered serpentinite and marble grains, the latter clouded and partly replaced with micrite, the presence of portlandite, indicate the terrazzo tiles were subjected to thermal impact. This is related to the fire that took place at the beginning of World War II. Based on this study, repair mortars were formulated, on one hand compatible with the authentic ones, on the other retaining traces of fire.
The basic problems of mineral resources valuation methodologies within the framework of System of Integrated Environmental and Economic Accounts
Authors: Galos Krzysztof , Nieć Marek , Saługa Piotr W. , Uberman Robert 
Published: May 2018

Abstract
Growing awareness of limits set by exhaustibility of natural resources has led to a conclusion that only through their valuation in monetary terms one may assess a comprehensive economic impact of their use. Thus mineral resources have been included from the beginning to almost all studies regarding natural resources assessments. The first result, widely recognized by international community, of researches came in the 1993 – edition of the “Handbook of National Accounting: Integrated Environmental and Economic Accounting”. One of the key outcomes of these works was a conclusion that measuring value of mineral resources for mineral raw materials production, alongside with physical flows of these materials, environment related transactions and measuring impact of the economy on the environment, should make basic pillars of this newly designed system, later named as the System of Integrated Environmental and Economic Accounts (SEEA). As implementation of SEEA is still in a primary stage, many methodological issues remain unsolved. This article attempts to enumerate achievements made so far and indicate issues in need for further development.
Taking into account the importance of mineral resources for further economic development of Poland authors indicate a necessity to develop and implement methodologies for monetary assessment of resources/reserves available, extracted and depleted in order to form a methodological base for a meaningful policy of sustainable growth. The special challenge results from monetary assessment of explored but yet undeveloped mineral deposits.
The impact assessment of quality parameters of coal and waste rock on the value of mining investment projects – hard coal deposits
Authors: Kopacz Michał 
Published: May 2018

Streszczenie
Artykuł stanowi próbę oceny wpływu parametrów geologicznych i górniczych na poziom przychodów, kosztów oraz wartość przedsięwzięć inwestycyjnych w górnictwie węgla kamiennego.
Teza pracy wiąże się z przekonaniem autora, iż w obszar czynników istotnie współokreślających ocenę przychodów, kosztów i efektywność eksploatacji należy wpisać, obok parametrów jakościowych węgla, także uzysk kopaliny.
Pomijanie lub pobieżna ocena parametrów jakościowych węgla w pokładach oraz wpływu uzysku na postęp i koszty wydobycia może istotnie zniekształcać ocenę potencjału konkretnych aktywów geologiczno-górniczych. Dotyczy to w szczególności wydobycia w nowych rejonach wydobywczych lub też nowych złożach.
Do badań symulacyjnych zbudowano dedykowany model oceny pozwalający skwantyfikować kierunek i siłę wpływu wartości opałowej, zawartości popiołu i siarki oraz współczynnika uzysku węgla netto (UWN) na poziom i zmienność łącznych przychodów, kosztów i ostatecznie wartość projektów geologiczno-górniczych. W tym celu opracowano również autorskie formuły szacowania kosztów stałych i zmiennych w funkcji zmiennego UWN.
Rezultaty badań przedstawiono ostatecznie w konwencji analizy scenariuszowej.
Uzyskane wyniki wskazują na istotny wpływ wartości opałowej i ilości skały płonnej mierzonej zmiennością uzysku węgla netto na poziom generowanych przychodów, kosztów oraz prognozowane miary oceny działalności operacyjnej hipotetycznej kopalni węgla kamiennego.
Wykazano, że zmiana o 1 GJ wartości opałowej może powodować od 3,57% do 4,76% wzrostu/spadku łącznych przychodów. W przypadku złóż węgla kamiennego, dla których realny uzysk węgla może wahać się w przedziale 60–80% można oczekiwać zmiany kosztów wydobycia węgla nawet o 53,0% w tym zakresie. Błąd oszacowania NPV, przy zmienności wartości opałowej w przedziale 21–27 GJ/Mg, może wahać się w przedziale 0–78%, natomiast spadek uzysku węgla o 18 pkt. może obniżać wycenę działalności operacyjnej kopalni nawet o 872,4%, co wynika z cech metody NPV i opracowanego scenariusza bazowego (NPV ≈ 0).
W publikacji nie wyczerpano zakresu analizowanej problematyki. Artykuł stanowi część większej całości prac nad sformułowaniem wytycznych (wskazówek) pozwalających właściwie szacować wartość aktywów geologiczno-górniczych w warunkach zmiennych parametrów geologicznych i górniczych, biorąc pod uwagę dodatkowo błędy oszacowania wartości średnich cech jakościowych wydobywanej kopaliny.
Fly ash from energy production – a waste, byproduct and raw material
Authors: Uliasz-Bocheńczyk Alicja , Mazurkiewicz Maciej , Mokrzycki Eugeniusz 
Published: May 2018

Abstract
Limited use of biomass has been observed in recent years. The processes of electricity and heat production in conventional boilers and fluidized bed boilers generate waste – mainly fly ash. This waste is traditionally used in many industries. The most important are: mining, production of building materials (including cement) and road construction. The use of fly ash in underground mining (suspension technology) is a method of fly ash recovery, which is typical for the Polish industry. The amount of fly ash (10 01 02) and waste (10 01 82) including ashes from fluidized bed boilers in the year 2012 amounted to 1,490.7 thousand tons. For many years, fly ashes from hard coal combustion in conventional boilers has also been used in various production technologies of building materials, such as: cement, concrete, building ceramics and lightweight aggregates. The ashes from hard coal combustion in fluidized bed boilers are also used in the production of cement and autoclaved aerated concrete. Due to extensive economic use, commercial power plants started to reclassify fly ash from hard coal combustion, turning waste into a by-product after meeting the requirements of the Act on waste of 14 December 2012. The ashes from the co-combustion of biomass are also used.
The utilization of fly ash from lignite combustion, both from conventional boilers and fluidized bed boilers, is a cause of concern, while the total recovery of fly ash from the combustion of hard coal and lignite has decreased in recent years. For this reason, studies on the use of traditional fly ash technologies such as the production of building materials and new fly ash technologies such as the use as sorbents in power generation and wastewater treatment, as well as on binding CO2 through mineral sequestration in the Carbon Capture and Utilization, are being carried out.
An expert system for underground coal mine planning
Authors: Brzychczy Edyta , Kęsek Marek , Napieraj Aneta , Magda Roman 
Published: May 2018

Abstract
In the current market situation, mining companies are faced with the necessity to take actions to improve the efficiency of the mining process. Some of these actions enforce a centralization of activities in the field of deposit economy and planning of mining operations in these companies. In the planning process with such scope the large knowledge of designers is required, which could be additionally supported by a knowledge base, supplied by information and data obtained during the completion of mining works, which also allows for use of the expert knowledge of other organizational units of the mine or the company. The paper presents an original expert system for mining works planning in the underground hard coal mines (MinePlanEx). The aim of the developed system is to support the designers of production planning in hard coal mines within the scope of: equipment selection, mining machinery combining into equipment sets and determining characteristic curves regarding the production results in the planned excavations. Knowledge of the system is represented by the rules selected with the chosen data mining techniques (association rules and classification trees) and obtained from experts. The first part of the paper presents a knowledge base, knowledge acquisition module and inference module which are the main components of the system. The second part contains an example of system operation.
Research, assessment and management of the travertine resources from the Banpotoc-Carpinis deposit (South Apuseni Mts., Romania)
Authors: Marinescu Mihai , Udubasa Sorin , Tiess Günter 
Published: May 2018

Abstract
Romania is not a large country but, due to the very complex geological structure, it has 110 mineral and power substances with identified and quantified resources and reserves. In time, the most numerous from these (82) have been exploited at the ground surface, in over 3,492 identified quarries and open pits. Travertine has been exploited since ancient times in Romania The exploitation of Brezinta (Mehedinti county) has been known since the Roman times. Although resources are found in many other zones, only two travertine deposits are presently exploited by Marmosim S.A.: Banpotoc-Carpinis and Geoagiu. Travertine extraction began at the Banpotoc-Carpinis deposit in 1870 and 9 quarries have functioned during time from which only one is still active today. This paper presents the way in which the research and valuation of the deposit was made, how the exploitation and processing of the travertine is made nowadays and what are its uses.
Effects of Proprioceptive Neuromuscular Facilitation Stretching and Kinesiology Taping on Pelvic Compensation During Double-Knee Extension
Authors: Lee Seung-Woong , Lee Jung-Hoon 
Published: May 2018

Abstract
Shortened hamstrings are likely to restrict the anterior pelvic tilt and induce a slumped posture due to the posterior pelvic tilt. This study was conducted to compare the effects of proprioceptive neuromuscular facilitation (PNF) stretching and modified anterior pelvic tilt taping (APTT) on hamstring shortness-associated pelvic compensation while executing seated double-knee extension. Male college students (28 healthy young adults; mean age: 21.4 ± 2.1 years) with hamstring shortness were recruited as study subjects and randomly assigned to either the PNF stretching group (control group) or the APTT group (experimental group). In all the subjects, changes in the movement distance of the centre of gluteal pressure (COGP) as well as rectus abdominis (RA) and semitendinosus (SEM) muscle activities were measured during seated double-knee extension while the respective intervention method was applied. Both groups showed significant decreases in COGP distance and RA muscle activity compared with their respective baseline values (p < 0.05), however, no significant changes were observed in SEM muscle activity. We can infer that not only a direct intervention on the hamstring, such as PNF stretching, but also a modified APTT-mediated pelvic intervention may be used as a method for reducing pelvic compensation induced by hamstring shortness.
Do Legal Barriers Really Protect the Labor Markets? Empirical Evidence of Polish Migrants after 2004
Authors: Schwabe Michał 
Published: May 2018

Abstract
The aim of this paper is to evaluate the role of intervening obstacles, understood as legal and policy barriers blocking immigrant access to foreign labor markets, in the international migration process. To do so, we use Polish international temporary emigrants in the years 2000-2012, which spans both the pre-accession period, when Polish citizens were not entitled to access other EU labor markets, as well as the post - accession period, when certain countries gradually removed intervening obstacles according to the transnational agreements.
The findings of this paper undermine the significance of intervening obstacles on Polish migration to EU countries. Instead, the primary driver of Polish migrants was the EU-15 business cycle - and not the opening of EU labor markets.
Basic Indicators of Systemic Risk in the EU Banking Sector. Implications for Banking Regulation
Authors: Sum Katarzyna 
Published: May 2018

Abstract
The issue of systemic risk regulation and management has gained substantial attention following the latest financial crisis. In the case of the EU it became crucial to deal with the systemic risk problem on a supranational level since the banking sectors of the member countries are highly integrated. While substantial measures have been undertaken to mitigate systemic risk in the EU, the discussion of further reforms continues. This study’s goal is to assess basic indicators of systemic risk in the EU banking sector by using three complementary methods: a forward-looking stock market data analysis, an EU-stress test analysis for systemically important banks, and an empirical investigation of the relation between banking regulation and systemic risk as measured by bank balance sheet indicators. The results lead to a recommendation of further necessary regulatory reforms, which appear in the conclusion.
Risk of Investments in Human Capital and Expected Worker Mobility
Authors: Shelest Olena 
Published: May 2018

Abstract
The main purpose of the article is to examine workers’ mobility expectations under the risk of investments in human capital. We focus on the earnings risk associated with investments in human capital. In particular, we attempt to identify the specific risk for occupational groups and then conduct a descriptive analysis of the mobility expectations in occupational groups with different risk levels. The empirical analysis is based on the cross-sectional data from the survey Bilans Kapitału Ludzkiego (Human Capital Balance).
Antimicrobial and toxicological evaluation of ethanol leaf extract of Salacia lehmbachii
Authors: Essien Augustine Dick , Akuodor Godwin Christian , Ajoku Gloria Ahunna , Megwas Anthony Uchenna , Anele Donatus Onyebuchi , Ezeunala Mercy Nwakaego , Okezie Alozie Ogwuegbu 
Published: May 2018

Abstract
The leaves of Salacia lehmbachii are used ethnomedically across Africa for the treatment of different diseases its antimicrobial activity as well as toxicological profile were evaluated. Antimicrobial activity against clinical strains of Pseudomonas aeruginosa, Salmonella typhi, Staphylococus aureus, Shigella species, Eschericha coli and Proteus mirabilis were compared with Gentamycin. Toxicological investigation was determined by administering 100 mg/kg, 200 mg/kg and 400 mg/kg of the ethanol leaf extract to male Wistar rats for 21 days with distilled water as control. Hematological and biochemical parameters as well as the vital organs were examined. The ethanol extract inhibited the growth of P. aeruginosa, S. typhi, S. aureus, Shigella species, E. coli and P. mirabilis to varying extents. The LD50 in rats was greater than 5000 mg/kg. Toxicological evaluation of the extract did not produce any significant effect on hematological and biochemical parameters and vital organs in rats. S. lehmbachii ethanol leaf extract did not demonstrate antimicrobial activity against selected microorganisms. Neither did it show any non-toxic effect on the parameters investigated in rats. Thus the extract can be considered safe when administered orally.
Survey of Certain Properties of Repetitive Gain Scheduling Control Systems Using the Method of the Algebraic Derivative
Authors: Nikolov E. , Nikolova N. G. , Grasiani B. 
Published: May 2018

Abstract
The present study systematizes certain methods for analysis at priori un-certainty and proposes new methods for analy-sis of the filtration features of the repetitive gain scheduling control sys-tems under the conditions of periodic harmonic interference. For analysis of the fil-tering features of the repetitive gain scheduling control systems, the following methods have been proposed and applied to a particular example: temporal analy-sis with “test” periodic im-pacts in nomi-nal parametric mode and frequency analysis, using the method of the alge-braic derivative.
The Unifying Feature of Projection in Model Order Reduction
Authors: Perev K. 
Published: May 2018

Abstract
This paper considers the problem of model order reduction of linear systems with the emphasis on the common features of the main approaches. One of these features is the unifying role of operator projection in model reduction. It is shown how projections are implemented for different methods of model reduction and what their properties are. The other common feature is the subspaces where projections are defined. The main approaches for model reduction which are considered in the paper are balanced truncation, proper orthogonal decomposition and the Lanczos procedure from the Krylov subspace methods. It is shown that the range spaces of system gramians for balanced truncation and the range space of the reachability and observability matrices for the Lanczos procedure coincide. The connection between balanced truncation and the proper orthogonal decomposition method is also established. Therefore, the methods for model reduction are similar in terms of general operational principles, and differ mostly in their technical implementation. Several numerical examples are considered showing the validity of the proposed conjectures.
Mean-Delta Features for Telephone Speech Endpoint Detection
Authors: Ouzounov A. 
Published: May 2018

Abstract
In this paper, a brief summary of the author’s research in the field of the contour-based telephone speech Endpoint Detection (ED) is presented. This research includes: development of new robust features for ED – the Mean-Delta feature and the Group Delay Mean-Delta feature and estimation of the effect of the analyzed ED features and two additional features in the Dynamic Time Warping fixed-text speaker verification task with short noisy telephone phrases in Bulgarian language.
Performance Evaluations of IPTables Firewall Solutions under DDoS attacks
Authors: Šimon M. , Huraj L. , Čerňanský M. 
Published: May 2018

Abstract
The paper presents design, background and experimental results of the IPTables applied in IPv4 and IP6Tables applied in IPv6 network compared through several tested parameters. The experimental testbed environment is based on P2P grid utilized for DDoS attacks. IPTables tool is used for packet filtering and consequently for preventing DoS/DDoS attacks. It allows a system administrator to configure the tables, the chains and rules it stores in order to manage the incoming and outgoing packets. The packets are treated according to the rules’ results provided by the packet processing. A rule in a chain can be bound with another chain in the table etc.
We employ the P2P grid environment to carry out as well as to coordinate DDoS attack on the availability of services to simulate real DDoS attack launched indirectly through many compromised computing systems. The same routing protocols as well as the same firewall rules were used for IPv4 and for IPv6 network. The main aim was to analyse pros and cons of new IP6Tables tool compared with IPTables in IPv4 networks in light of the resistance to DDoS attacks which is still one of the most significant threats in the IPv6 networks.
Image-based BRDF Representation
Authors: Mihálik A. , Ďurikovič R. 
Published: May 2018

Abstract
To acquire a certain level of photorealism in computer graphics, it is necessary to analyze, how the materials scatter the incident light. In this work, we propose the method to direct rendering of isotropic bidirectional reflectance function (BRDF) from the small set of images. The image-based rendering is focused to synthesize as accurately as possible scenes composed of natural and artificial objects. The realistic image synthesis of BRDF data requires evaluation of radiance over the multiple directions of incident and scattered light from the surface. In our approach the images depict only the material reflectance, the shape is represented as the object geometry. We store the BRDF representation, acquired from the sample material, in a number of two-dimensional textures that contain images of spheres lit from the multiple directions. In order to render particular material, we interpolate between textures in the similar way the image morphing works. Our method allows the real-time rendering of tabulated BRDF data on low memory devices such as mobile phones.