bluuebunny/crossref_metadata_2025_split huggingface dataset:
Portfolio Diversification in the South-East European Equity Markets
Authors: Zaimovic Azra , Arnaut-Berilo Almira , Mustafic Arnela 
Published: July 2017

Abstract
Diversification potential enables investors to manage their risk and decrease risk exposure. Good diversification policy is a safety net that prevents a portfolio from losing its value. A well-diversified portfolio consists of different categories of property with low correlations, while highly correlated markets have the feature of low possibilities for diversification. The biggest riddle in the world of investments is to find the optimal portfolio within a set of available assets with limited capital. There are numerous studies and mathematical models that deal with portfolio investment strategies. These strategies take advantage of diversification by spreading risk over several financial assets. Modern portfolio theory seeks to find the optimal model with the best results. This paper tries to identify relationships between returns of companies traded in South-East European equity markets. A Markowitz mean-variance (MV) portfolio optimization method is used to identify possibilities for diversification among these markets and world leading capital markets. This research also offers insight into to the level of integration of South-East European equity markets. Principal component analysis (PCA) is used to determine components that describe the strong patterns and co-movements of the dataset. Finally, we combined MV efficient frontier and equity, which represent PCA components, to draw conclusions. Our findings show that PC analysis substantially simplifies asset selection process in portfolio management. The results of the paper have practical applications for portfolio investors.
Perceived Quality and Corporate Image in Mobile Services: The Role of Technical and Functional Quality
Authors: Babic-Hodovic Vesna , Arslanagic-Kalajdzic Maja , Imsirpasic Amina 
Published: July 2017

AbstractThe purpose of this study is to assess the technical (output) and functional (process) quality of mobile services, as well as the role of corporate image as a mediator between technical/functional quality perceptions and overall quality assessment of mobile services. Grönroos’s service quality model is used as the conceptual base of the study. Technical quality was operationalized through two sub-dimensions: baseline network quality and augmented technical quality. The SERVPERF framework was used in the operationalization of the functional quality. A quantitative survey was conducted with (n = 414) customers of the telecommunication operator in B&H. The results suggest that corporate image mediates the effects of (1) two functional quality dimensions (tangibles and assurance) and (2) both technical quality dimensions on the overall service quality assessment. The core technical quality dimension (network) is also directly related to overall service quality perception. A discussion of the results and their implications for theory and practice is then presented.
Current mode pulse width modulation/pulse position modulation based on phase lock loop
Authors: Wisartpong Pichet , Silaphan Vorapong , Kurutach Sunee , Wardkein Paramote 
Published: July 2017

Abstract
In this paper, the fully integrated CMOS current mode PLL with current input injects at the place of input or output of the loop filter without summing amplifier circuit. It functions as PPM and PWM circuit is present. In addition, its frequency response is an analysis which electronic tuning BPF and LPF are obtained. The proposed circuit has been designed with 0.18 μm CMOS technology. The simulation results of this circuit can be operated at 2.5 V supply voltage, at center frequency 100 MHz. The linear range of input current can be adjusted from 43 μA to 109 μA, and the corresponding duty cycle of pulse width output is from 93% to 16% and the normalized pulse position is from 0.93 to 0.16. The power dissipation of this circuit is 4.68 mW with the total chip area is 28 μm × 60 μm.
Novel single-phase five-level inverter utilizing digital counter control scheme
Authors: Nwosu Cajethan M. , Umeogamba Anthony I. , Ogbuka Cosmas U. 
Published: July 2017

AbstractA novel single-phase digital control circuit-based five level inverter (FLI) is presented in this paper. Based on the determined switching angle, one switching cycle of the inverter is divided into segments from which the switching sequence of the inverter switches is digitized. A programmed counter built aroundJ−Kflip flops with logic gates provided the needed switching signals for theH-bridge inverter. Proposed inverter is verified through simulation in a MATLAB/SIMULINK environment and simulation results are given. Simulation results show notable reduction in total harmonic distortion (THD) in the inverter output voltage and load current. With an RL load (of 200 Ω and 0.250H), a single digit THD of 8.5 1% for the inverter load current is realized. Comparison of the novel control circuit-dependent FLI with the conventional and contemporary power-circuit-dependent cascadedH-bridge inverter (CHBI) show that the novel FLI is synthesized with lesser number of power circuit and control circuit components.
The analysis of output voltage distortion of inverter for frequency lower than the nominal
Authors: Bartman Jacek 
Published: July 2017

Abstract
The paper discussed the studies related to the output voltage distortion of frequency inverter depending on its frequency. The changes in the effective value of voltage, THD, harmonics and interharmonics were presented for three different frequencies, lower than 50Hz. Additionally, it was shown how these values change depending on measurement time, presenting waveforms cycle by cycle in graphs, averaged in 10 periods and averaged in 150 periods of the analyzed signal. The studies were conducted in the laboratory area equipped with power quality meter class A.
Wheat water use and yield under different salinity of irrigation water
Authors: Abedinpour Meysam 
Published: July 2017

Abstract
A field experiment was conducted for determination of crop coefficient (KC) and water stress coefficient (Ks) for wheat crop under different salinity levels, during 2015–2016. Complete randomized block design of five treatments were considered, i.e., 0.51 dS·m−1 (fresh water, FW) as a control treatment and other four saline water treatments (4, 6, 8 and 10 dS·m−1), for S1, S2, S3 and S4 with three replications. The results revealed that the water consumed by plants during the different crop growth stages follows the order of FW > S1 > S2 > S3 > S4 salinity levels. According to the obtained results, the calculated values of KC significantly differed from values released by FAO paper No 56 for the crops. The Ks values clearly differ from one stage to another because the salt accumulation in the root zone causes to reduction of total soil water potential (Ψt), therefore, the average values of water stress coefficient (Ks) follows this order; FW(1.0) = S1(1.0) > S2(1.0) > S3(0.93) > S4(0.82). Precise data of crop coefficient, which is required for regional scale irrigation management is lacking in developing countries. Thus, the estimated values of crop coefficient under different variables are essential to achieve the best management practice (BMP) in agriculture.
Influence of extraneous waters on the quality and loads of pollutants in wastewater discharged into the treatment plant
Authors: Kaczor Grzegorz B. , Chmielowski Krzysztof , Bugajski Piotr 
Published: July 2017

Abstract
The aim of the study was to analyze an influence of an inflow penetrating into two selected small sewerage systems during a rainy weather on pollutant concentration and load in raw sewage. Studies were conducted in 2010–2015 on two small sewerage systems in Małopolska province. The studies confirmed that the inflow penetrating into the sewerage systems resulted in a decrease of pollutant concentrations in sewage. However, they also showed that this dilution was not constant for all types of pollutants. The most important outcome of the study was demonstrating that despite its diluting effect on pollutants, the intense inflow into a sewerage system resulted in an increase of a sewage pollutant load. This increase was not regular, but it was rising dramatically when the inflow share in sewage exceeded 50%. The study indicated that the inflow penetrating into the sewerage system should not be disregarded, as it actually presented a significant threat to the wastewater treatment process and in consequence to the quality of recipient waters.
The effects of uninsulated sewage tanks on groundwater. A case study in an eastern Hungarian settlement
Authors: Mester Tamás , Szabó György , Bessenyei Éva , Karancsi Gergő , Barkóczi Norbert , Balla Dániel 
Published: July 2017

AbstractIn our study we attempt to demonstrate the effects of uninsulated sewage tanks, which are the most important sources of contamination in settlements without sewage systems, on groundwater quality. We compared the results of measurements carried out before and one and a half years after the construction of the sewage system. We established 3 m deep monitoring wells within a 25 m radius of a sewage tank, which were then sampled, and the level of groundwater was recorded. The 3D model constructed on the basis of the saturated zone shows that the effluent wastewater formed a groundwater level dome with a height of more than 1 m. After the sewage tank was taken out of use the difference between the highest and lowest groundwater levels decreased to a few centimetres. In our study we investigated the spatial distribution of NH4+(ammonium). Using the 3D model we were able to precisely determine the volume of water bodies with different levels of contamination. In an approximately 25 m3water body, in the immediate environment of a sewage tank in use we detected NH4+at a concentration which was characteristic of undiluted wastewater (>90 mg·dm−3). After the sewage tank was taken out of use, the concentration in its immediate environment decreased by more than 50%, although almost everywhere in the modelled area concentrations were measured above the limit value. Based on the above, we can conclude that the cleaning process has started, but the complete decontamination of the groundwater will take several years.
Surface water resources of small agricultural watershed in the Kujawy region, central Poland
Authors: Miatkowski Zygmunt , Smarzyńska Karolina 
Published: July 2017

AbstractThe goal of the paper was to determine surface water resources of an agricultural watershed representative for the areas of intensive crop production in the Kujawy region. This area is characterised by the lowest average annual precipitation in Poland and high water demands related to the intensive crop production.Hydrological studies were carried out in 2007–2011 in the upper Zgłowiączka River watershed located in the eastern part of the analysed region. Over 90% of the study area is used as an arable land.Water velocity in the river bed and water level were measured at the outlet of the watershed in the river cross-section Samszyce.The upper Zgłowiączka River has a snow-rainfall hydrological regime, strongly modified by anthropogenic activities related to the intensive crop production and installation of subsurface drainage system. The study period was characterised by very large temporal variability of hydrological conditions. The mean annual outflow coefficient amounted to 18% and varied highly in time: from 3% in the average years to 62% in the abnormally wet 2011. Average discharge (SSQ) in the Samszyce river cross-section was equal to 0.25 m3·s−1, and the mean unit outflow – to 3.2 dm3·s−1·km−2. The results of the study show that disposable surface water resources of the Kujawy region are very small, especially in the summer half-year. Thus, their utilization as a potential source of water for crop irrigation can be taken into account only, if water excesses will be retained within the watershed and used in conjunction with groundwater resources.
The Power to Judge, the Power to Act: the Argentine Supreme Court as a Policymaker
Authors: Campora Mario 
Published: July 2017

AbstractEven though the role of courts to enforce economic, social and cultural rights through structural remedies is well established, the implementation stage of rulings following successful litigation seems to be an area of research still in the making. In the Global South, certain constitutional courts have taken on such litigation as a way to advance economic and social rights. The Judiciary Power thus became a key actor in the framing and execution of public policies. This paper examines how the Argentine Supreme Court has intervened after 2001 in public policies regarding the enforcement of social security, environmental and human rights.
Do grammatical relations reflect information status? Reassessing Preferred Argument Structure theory against discourse data from Tondano
Authors: Brickell Timothy C. , Schnell Stefan 
Published: July 2017

AbstractWe test Preferred Argument Structure theory against corpus data from Tondano, an Austronesian language with symmetrical voice. Investigating the use of full noun phrases in individual argument positions, we find no significant clustering of both S and P as opposed to A, hence no discourse ergativity. Moreover, neither pivotal nor non-pivotal grammatical relations appear to specialise in the accommodation of full noun phrases. Thus, grammatical relations do not serve as architecture for regulating information flow in discourse. Only constituent order reflects information flow, so that full noun phrases tend to occur in clause-final position. More generally, correlations of humanness and topicality predict most straightforwardly attested patterns of argument realisation.
Influence of Bi3+content on photoluminescence of InNbO4:Eu3+,Bi3+for white light-emitting diodes
Authors: Tang An , Gu Liduo , Shao Fengxiang , Liu Xidong , Zhao Yongtao , Chen Haijun , Zhang Hongsong 
Published: July 2017

AbstractA series of red-emitting phosphors InNbO4:Eu3+,Bi3+was prepared by a high temperature solid-state reaction. The structure, size distribution and luminescence properties of the phosphors were respectively characterized by X-ray diffraction (XRD), laser particle size and molecular fluorescence spectrometer. The XRD results indicate that the phase-pure samples have been obtained and the crystal structure of the host has not changed under the Eu3+and Bi3+co-doping. The test of size distribution shows that the phosphor has a normal size distribution. The excitation spectra illustrate that the dominant sharp peaks are located at 394 nm (7F0→5L6) and 466 nm (7F0→5D2). Meanwhile, the emission spectra reveal that the phosphors excited by the wavelength of 394 nm or 466 nm have an intense red-emission line at 612 nm owing to the5D0→7F2transition of Eu3+. Bi3+doping has not changed the peak positions except the photoluminescence intensity. The emission intensity is related to Bi3+concentration, and it is up to the maximum when the Bi3+-doping concentration is 4 mol%. Due to good photoluminescence properties of the phosphor, the InNbO4:0.04Eu3+,0.04Bi3+may be used as a red component for white light-emitting diodes.
Pattern formation in the nonlinear Schrödinger equation with competing nonlocal nonlinearities
Authors: Maucher F. , Pohl T. , Krolikowski W. , Skupin S. 
Published: July 2017

AbstractWe study beam propagation in the framework of the nonlinear Schrödinger equation with competing Gaussian nonlocal nonlinearities. We demonstrate that such system can give rise to self-organization of light into stable states of trains or hexagonal arrays of filaments, depending on the transverse dimensionality. This long-range ordering can be achieved by mere unidirectional beam propagation. We discuss the dynamics of long-range ordering and the crucial role which the phase of the wavefunction plays for this phenomenon. Furthermore we discuss how transverse dimensionality affects the order of the phasetransition.
Recent progress in Pancharatnam–Berry phase optical elements and the applications for virtual/augmented realities
Authors: Lee Yun-Han , Tan Guanjun , Zhan Tao , Weng Yishi , Liu Guigeng , Gou Fangwang , Peng Fenglin , Tabiryan Nelson V. , Gauza Sebastian , Wu Shin-Tson 
Published: July 2017

AbstractIn this review paper,we report recent progress on Pancharatnam-Berry (PB) phase optical elements, such as lens, grating, and deflector. PB lenses exhibit a fast switching time between two or more focal lengths with large diopter change and aperture size, which is particularly attractive for addressing the accommodation mismatch in head-mounted display devices. On the other hand, PB gratings and deflectors offer a large-angle beam deflection with wide acceptance cone and high efficiency, as compared to conventional volume gratings. Such merits provide great advantages for waveguide-coupling augmented reality headsets. Moreover, the thickness of PB optical elements is only a few micrometers, thus they can be conveniently integrated into modern wearable display systems.
Factors Affecting Students’ Privacy Paradox and Privacy Protection Behavior
Authors: Weinberger Maor , Bouhnik Dan , Zhitomirsky-Geffet Maayan 
Published: July 2017

AbstractIn this exploratory study, we investigate the factors affecting two opposite types of online privacy behavior: 1) online privacy paradox, i.e. a mismatch between users’ online privacy attitudes and their online privacy behavior; and 2) online privacy protection. To assess these two types of behavior, we devised a new direct scale comprising 25 items explicitly highlighting benefits and risks of the examined behavior. Various factors related to online privacy and anonymity were considered in light of the existing theories on online privacy behavior. To this end, 169 students from different fields of study in Israeli academia were administered closed-ended questionnaires. The multivariate linear regression analysis showed that information science students had a significantly lower tendency toward privacy paradox behavior compared to other students. In addition, we found that as the participants’ privacy concern and online privacy self efficacy increase, their tendency toward privacy paradox behavior decreases. However, surprisingly, there was no significant association between privacy protection behavior and high technical skills or online privacy literacy. This research has social implications for academia and the general public, as it shows that the protection of online privacy does not depend on technical knowledge or complicated tool usage, but rather can be achieved by raising users’ online privacy concern and self-efficacy.
The place of the “quantitative signature symbols” in the classification of the cartographic presentation methods
Authors: Korycka-Skorupa Jolanta , Pasławski Jacek 
Published: July 2017

Abstract
The authors of the article pay their attention to the lack of a generally accepted classification of the cartographic presentation methods. The classification, which was described in the Ratajski’s handbook (1989) in the mostly extensive way, is commonly used in the Polish literature. According to the authors, it would be appropriate to modify one of the types of symbols (quantitative ones) as an independent method of data presentation at the quantitative level, in addition to the method of diagram, choropleth, dot method and isoline one.
Research on identification method of heavy vehicle rollover based on hidden Markov model
Authors: Zhao Zhiguo , Wang Yeqin , Hu Xiaoming , Tao Yukai , Wang Jinsheng 
Published: July 2017

AbstractAiming at the problem of early warning credibility degradation as the heavy vehicle load and its center of gravity change greatly; the heavy vehicle rollover state identification method based on the Hidden Markov Model (HMM, is introduced to identify heavy vehicle lateral conditions dynamically in this paper. In this method, the lateral acceleration and roll angle are taken as the observation values of the model base. The Viterbi algorithm is used to predict the state sequence with the highest probability in the observed sequence, and the Markov prediction algorithm is adopted to calculate the state transition law and to predict the state of the vehicle in a certain period of time in the future. According to combination conditions of Double lane change and steering, applying Trucksim and Matlab trained hidden Markov model, the model is applied to the online identification of heavy vehicle rollover states. The identification results show that the model can accurately and efficiently identify the vehicle rollover state, and has good applicability. This study provides a novel method and a general strategy for active safety early warning and control of vehicles, which has reference significance for the application of the Hidden Markov theory in collision, rear-end and lane departure warning system.
Seismic stability of the survey areas of potential sites for the deep geological repository of the spent nuclear fuel
Authors: Kaláb Zdeněk , Šílený Jan , Lednická Markéta 
Published: July 2017

Abstract
This paper deals with the seismic stability of the survey areas of potential sites for the deep geological repository of the spent nuclear fuel in the Czech Republic. The basic source of data for historical earthquakes up to 1990 was the seismic website [10]. The most intense earthquake described occurred on September 15, 1590 in the Niederroesterreich region (Austria) in the historical period; its reported intensity is Io = 8-9. The source of the contemporary seismic data for the period since 1991 to the end of 2014 was the website [11]. It may be stated based on the databases and literature review that in the period from 1900, no earthquake exceeding magnitude 5.1 originated in the territory of the Czech Republic.
In order to evaluate seismicity and to assess the impact of seismic effects at depths of hypothetical deep geological repository for the next time period, the neo-deterministic method was selected as an extension of the probabilistic method. Each one out of the seven survey areas were assessed by the neo-deterministic evaluation of the seismic wave-field excited by selected individual events and determining the maximum loading.
Results of seismological databases studies and neo-deterministic analysis of Čihadlo locality are presented.
Wiretapping End-to-End Encrypted VoIP Calls: Real-World Attacks on ZRTP
Authors: Schürmann Dominik , Kabus Fabian , Hildermeier Gregor , Wolf Lars 
Published: July 2017

AbstractVoice calls are still one of the most common use cases for smartphones. Often, sensitive personal information but also confidential business information is shared. End-to-end security is required to protect against wiretapping of voice calls. For such real-time communication, the ZRTP key-agreement protocol has been proposed. By verbally comparing a small number of on-screen characters or words, called Short Authentication Strings, the participants can be sure that no one is wiretapping the call. Since 2011, ZRTP is an IETF standard implemented in several VoIP clients.In this paper, we analyzed attacks on real-world VoIP systems, in particular those implementing the ZRTP standard. We evaluate the protocol compliance, error handling, and user interfaces of the most common ZRTP-capable VoIP clients. Our extensive analysis uncovered a critical vulnerability that allows wiretapping even though Short Authentication Strings are compared correctly. We discuss shortcomings in the clients’ error handling and design of security indicators potentially leading to insecure connections.