bluuebunny/crossref_metadata_2025_split huggingface dataset:
On a numerical flux for the pedestrian flow equations*
Authors: Kubera P. , Felcman J. 
Published: May 2018

Abstract
The pedestrian flow equations are formulated as the hyperbolic problem with a source term, completed by the eikonal equation yielding the desired direction of the pedestrian velocity. The operator splitting consisting of successive discretization of the eikonal equation, ordinary differential equation with the right hand side being the source term and the homogeneous hyperbolic system is proposed. The numerical flux of the Vijayasundaram type is proposed for the finite volume solution of the hyperbolic problem. The Vijayasundaram numerical flux, originally proposed for the hyperbolic problems possessing the homogeneity property is extended for pedestrian flow, where the homogeneity property is lost. The application of the proposed numerical flux is demonstrated on the physically relevant problem.
The Simulation and Experimental Results of Dynamic Behaviour of Torque Motor Having Permanent Magnets
Authors: Despotović Željko , Šinik Vladimir 
Published: May 2018

Abstract
The application, construction, and principle of operation of the torque motor having permanent magnets are presented first. Since dynamic behaviour of a servohydraulic system is, to a large extent, determined by dynamic behaviour of the applied torque motor, an analysis of motor’s dynamic behaviour is carried out and its dynamic transfer characteristic is determined. Finally, the simulation and experimental results of dynamic behaviour of the torque motor are presented.
On the Thrust of a Single Electrode Electrohydrodynamic Thruster
Authors: Ilit’ Tomáš , Váry Michal , Valko Pavol 
Published: May 2018

Abstract
Linear thrust generation by a single pin emitter electrode under AC excitation has been studied. Presented are thrust measurements of a single electrode thruster, in comparison with classical, two electrode electrohydrodynamic thruster. The experiments show comparable thrust for both configurations at low voltage levels, suggesting higher thrust-to-weight ratio of single electrode thrusters at low applied voltages. Further, a hypothesis of single electrode thrust creation is proposed.
Atypical Case of Pityriasis Rosea in a Child Following Streptococcal Erythema Nodosum
Authors: Chiriac Anca , Brzezinski Piotr , Podoleanu Cristian , Stolnicu Simona 
Published: May 2018

AbstractIntroduction:Pityriasis rosea (PR) is a widespread skin erythemato-squamous eruption, occurring mostly in young adults.Case presentation:A 9-year-old patient presented with multiple lesions developed after streptococcal pharyngitis and erythema nodosum diagnosed and treated with penicillin prior to the PR.Conclusion:This unique case should be considered a coincidence of two consecutive diseases.
The Exploitation Problems Marine Light Constructions for Corrosion Resistance / Problemy Eksploatacyjne Lekkich Konstrukcji Morskich w Aspekcie Odporności Korozyjnej
Authors: Jurczak Wojciech 
Published: May 2018

Abstract
Corrosive degradation of construction materials for marine structures is a natural phenomenon. The extent of deterioration in mechanical properties of materials used in ship construction is directly linked to the chemical makeup of the material as well as the prevailing environmental conditions (e.g. salinity, physical stress) an the applied anti-corrosive coating. The paper presents results of research into stress corrosion of highly durable aluminum alloys. In order to increase the safety while using the above mentioned components, logging of corrosive potential has been introduced in the case of selected (corrosion-prone) number of surfaces of the quarter-section in relation the model 620 ship, made of 7020 alloy, so that the hazard of corrosive breach can be monitored.
Modeling of Performance And Safety of a Multi-Task Unmanned Autonomous Maritime Vehicle / Modelowanie Ruchu i Bezpieczeństwa Wielozadaniowego Bezzałogowego Autonomicznego Pojazdu Wodnego
Authors: Gerigk Mirosław K. 
Published: May 2018

Abstract
At the beginning of the paper the aim of research is presented. Then the method is introduced. Next, the unmanned autonomous maritime vehicle is briefly described. The following chapter concerns a model of vehicle performance including the ballasting and motion. Some information on an integrated steering, positioning and stabilization system of the vehicle is briefly presented in the paper. Such the system enables to obtain a fully autonomous vehicle. In the final part of the paper some issues connected with the risk assessment and assessment of the vehicle safety are introduced.
The Analysis and Evaluation Assessment of Safety of Selected Types of Exploitation Systems Means of Transport / Analiza i Ocena Porównawcza Bezpieczeństwa Działania Wybranych Typów Systemów Eksploatacji Środków Transportowych
Authors: Muślewski Łukasz , Bojar Piotr , Muciok Łukasz , Lewalski Michał 
Published: May 2018

Abstract
In a situation of increasing the supply of means of individual transport and not capable of following the development of infrastructure, an important issue is the issue of ensuring adequate levels of efficiency, safety and the competitiveness of the operation of the exploitation of public transport services. Factors affecting the safe operation pending exploitation systems of vehicles, in a differentiated way affect the level of safety provided services in smaller cities - up to 100 thousand inhabitants, with respect to the cities which are agglomerations of more complex structure, which are cities the number to 500 thousand inhabitants. This paper attempts to analyze and evaluate the safety of the operation of the public transport services exploitation, on the basis of the same assessment criteria, comparing two different sized urban areas.
The Impact of Propeller on Aerodynamics of Aircraft / Wpływ Śmigła Na Aerodynamikę Samolotu
Authors: Zalewski Wiesław 
Published: May 2018

Abstract
The paper presents a numerical analysis of the impact of working propellers on the aerodynamics of the aircraft. Analysis was made on the example of a twin-engined, unmanned aircraft with electric drive during the low altitude flight. Three configurations were studied and compared: the plane without propellers, the plane with pusher propellers and the plane with tractor propellers. For each configuration distributions of aerodynamic coefficients along the span of the wing and their global values for the entire aircraft were estimated. Calculations were performed using the Fluent solver with implementation of a simplified model of propeller based on the Blade Element Theory. Results of the analysis indicate a slight advantage of the tractor propellers configuration.
Radio Frequency Co-Site Management
Authors: Bouleanu Iulian , Alexandrescu Dorin , Bora Mircea 
Published: May 2018

Abstract
The radio spectrum is a limited national resource, essential for some governmental applications and increasingly important for a series of non-governmental applications. The allocation of radio resources is done in a centralized manner, designating frequency managers of the defense system structures as local administrators of the resources allotted to the supported echelon. They have a limited number of frequencies they can assign to the emission sources in their area of responsibility. The article addresses the issue of radio spectrum management in the frequency allocation plans when using a large number of emission and reception sources for means of communication and non-communication in a small area. Locating several emission sources in the same site leads to different types of disturbing signals: emissions outside the bandwidth, harmonics and intermodulation. The article categorizes and describes these sources, presents the results of measurements distinguishing them, as well as the results of implementing some protective measures. Finally, the authors suggest a software solution for the local distribution of frequency resources.
The Quadrotor-Based Night Watchbird UAV System Used In The Force Protection Tasks
Authors: Szabolcsi Róbert 
Published: May 2018

Abstract
The Unmanned Aerial Vehicles (UAV), or Unmanned Aerial Systems (UAS) are widely used today in real time, high precision reconnaissance missions. The UAS can lean on various types of the UAVs, whilst this paper deals only with multirotor UAV applications. The special flying abilities of the multirotor UAVs (e.g. vertical take-off and landing, hovering, flying at extremely low altitudes and airspeeds) open new areas in UAV applications. Challenges of the modern era put many problems to be solved such as problems of safeguarding in civil life, handling disaster management tasks, border control, and, finally, solution of force protection tasks in operational theatre, or out of war theatre. Author will lay down a brand-new concept of the UAV system applied in bad visibility to improve efficiency of the solution of the force protection tasks, which reduces human resources needed for this purpose. The proposed Night Watchbird UAV system is a new one using modern methods and principles to reach basic goal of reconnaissance providing real-time information for commanders, and for military forces, in general.
Analysis Regarding The Maintenance Efficiency Of Military Technical Systems
Authors: Virca Ioan , Manescu Gabriel , Prunescu Gheorghe 
Published: May 2018

Abstract
The purpose of this paper is to highlight the necessity of rethinking and restructuring the current system of maintenance for the military technical systems, based on the criteria of technical and economic efficiency of maintenance, as well as its management. The current maintenance system, rigorously planned and organized, but with irregular allocation of financial and material resources, could be made more efficient to the extent in which appropriate financial funds are provided and conceptual changes are brought to the objectives and to the content of the two components of maintenance, that of preventive maintenance (PREMENT) and of corrective maintenance (CORMENT) respectively. These changes at the operational level will be able to determine the reorientation of the financial resources towards maximizing the preventive maintenance activities. This is a major trend of the management of technical military systems maintenance within the NATO member states which results in important achievements in the field of manufacturing and employing military equipment.
How and why actions are selected: action selection and the dark room problem
Authors: Venter Elmarie 
Published: May 2018

Abstract
In this paper, I examine an evolutionary approach to the action selection problem and illustrate how it helps raise an objection to the predictive processing account. Clark examines the predictive processing account as a theory of brain function that aims to unify perception, action, and cognition, but - despite this aim - fails to consider action selection overtly. He off ers an account of action control with the implication that minimizing prediction error is an imperative of living organisms because, according to the predictive processing account, action is employed to fulfill expectations and reduce prediction error. One way in which this can be achieved is by seeking out the least stimulating environment and staying there (Friston et al. 2012: 2). Bayesian, neuroscientific, and machine learning approaches into a single framework whose overarching principle is the minimization of surprise (or, equivalently, the maximization of expectation. But, most living organisms do not find, and stay in, surprise free environments. This paper explores this objection, also called the “dark room problem”, and examines Clark’s response to the problem. Finally, I recommend that if supplemented with an account of action selection, Clark’s account will avoid the dark room problem.
Ex-situ characterization of pre- and post-transient specimens of Zr1Nb alloys
Authors: Krausová A. , Macák J. , Novák M. 
Published: May 2018

Abstract
The ex-situ tests were performed with Zr1Nb alloy specimens
that had been pre-exposed to the environment with an
elevated concentration of lithium (70 ppm Li as LiOH) at the
temperature of 360 °C for a period of 63 to 77 days prior to
the measurement. The impedance changes at the phase alloy-
-oxide-electrolyte interface were monitored using the ex-situ
electrochemical impedance spectroscopy. At the same time, the
progress of electrolyte penetration in the oxide porous structure
was studied. The oxidic layer and the electrolyte penetration
are characterized by the elements of the equivalent circuit
model and Jonscher analysis that enables calculation of the
dielectric thickness of the oxide.
Deconstruction, Walt Whitman, and the Purpose of Literary Education
Authors: Pokrivčák Anton 
Published: May 2018

AbstractThe article explores the purpose of literary theory, and, consequently, literary education at the beginning of the twenty-first century. It first discusses some of the ideas of Paul de Man for whom literary scholarship is challenged by the incompatibility between the nature of the object of literary theory and the methods used to analyse it. Then the author briefly traces some other ideas regarding the nature of literature and their reflection in establishing the purpose of literary education. A particular emphasis is paid to a re-evaluation of the universality of Walt Whitman´s message, as expressed in his “Song of Myself,” under the circumstances of contemporary ideological and cultural struggles.
Broadband Fabry–Pérot Resonator From Zerodur for Laser Stabilisation Below 1KHZ Linewidth With < 100 HZ/S Drift and Reduced Sensitivity to Vibrations
Authors: Bluss K. , Atvars A. , Brice I. , Alnis J. 
Published: May 2018

Abstract
Here we demonstrate the results of creating a two-mirror Fabry-Pérot resonator (FPR) that allows achieving the spectral width of a stabilised laser line below 1 kHz. It had low expansion Zerodur spacer and broadband high reflectance mirrors (99.85% in the range of 630 to 1140 nm). FPR was vertically mid-plane mounted for reduced sensitivity to vibrations and included in two shields inside a vacuum chamber to lower temperature fluctuations. Peltier element was used for temperature stabilisation at zero-expansion temperature. Pound-Drever-Hall (PDH) technique was applied. The signal from FPR was compared to ultra-stable signal (of about 1 Hz linewidth) to form a beat note signal. For the best performance, width of the beat note signal was below 1 kHz with the linear drift of about 23 Hz/s at 780 nm. The Allan deviation showed relative stability of the signal to be about 1 × 10-12.
Temperature Sensor Feasibility Study of Wireless Sensor Network Applications for Heating Efficiency Maintenance in High-Rise Apartment Buildings
Authors: Freliha B. , Kondratjevs K. , Kunicina N. , Zabasta A. 
Published: May 2018

Abstract
Cities are responsible for 60%-80% of the world’s energy use and for approximately the same percentage of greenhouse gas emissions. The existing multi-apartment buildings of multifamily housing sector are often energy inefficient, and the heating system does not ensure optimization of heat distribution of individual apartments. Heat distribution, heating system balancing, heat loss detection and calculation, individual heat energy accounting are difficult tasks to accomplish. This article deals with the temperature monitoring system designed to retrieve temperature differences necessary for overall building heat monitoring and individual apartment monitoring. The sensor testing case study process and its measurements are analysed.
Development of Mathematical Models for Detecting Micron Scale Volumetric Defects in Thin Film Coatings
Authors: Gaigals G. , Donerblics M. , Dreifogels G. 
Published: May 2018

Abstract
The focus of the present research is to investigate possibilities of volumetric defect detection in thin film coatings on glass substrates by means of high definition imaging with no complex optical systems, such as lenses, and to determine development and construction feasibility of a defectoscope employing the investigated methods. Numerical simulations were used to test the proposed methods. Three theoretical models providing various degrees of accuracy and feasibility were studied.
Joint Dimensioning of Outdoor Heterogeneous Radio Access Networks (HetNet) using Monte Carlo Simulation
Authors: Ratkóczy Péter , Mitcsenkov Attila 
Published: May 2018

Abstract
The experienced mobile traffic increase in the recent years made traffic capacity the bottleneck instead of the coverage constraints, calling for significantly higher density of the base stations. Heterogeneous radio access networks (HetNet) provide a possible solution to this problem, combining various wireless technologies. In this paper we investigated the joint dimensioning of the co-existent radio access networks, the relation between the required macro and small cell densities to meet a certain traffic demand, and compared the two main, competing technological solutions, namely small cells and Wi-Fi, suitable to complement an LTE (macrocell) network.
Merging diaries and GPS records: The method of data collection for spatio-temporal research
Authors: Šveda Martin , Madajová Michala 
Published: May 2018

Abstract
The results of a ‘proof-of-concept’ study that examined a new opportunity for using GPS technology in activity surveys are presented in this article. The aim is to demonstrate the method of collection and processing of individual time-space data via the dual records of a time-space diary and the GPS locator. The GPS technology here is not treated as a substitute for the traditional method of diaries; rather, the paper concentrates on the potential existing in a combination of these two techniques. The time-geographical approach and the corresponding methodology are used in order to assess the complexities of an individual’s everyday life, and to capture the spectrum of human activities in a data frame applicable to different analyses in behavioural, social and transportation research. This method not only improves the quality and robustness of spatio-temporal data, but also reduces under-reporting and the burdens on the respondents.
A universal meteorological method to identify potential risk of wind erosion on heavy-textured soils
Authors: Středová Hana , Spáčilová Bronislava , Podhrázská Jana , Chuchma Filip 
Published: May 2018

Abstract
The climate of Central Europe, mainly winter seasons with no snow cover at lower altitudes and a spring drought as well, might cause erosion events on heavy-textured soils. The aim of this paper is to define a universal method to identify the potential risk of wind erosion on heavy-textured soils. The categorization of potential wind erosion risk due to meteorological conditions is based on: (i) an evaluation of the number of freeze-thaw episodes forming bare soil surfaces during the cold period of year; and (ii), an evaluation of the number of days with wet soil surfaces during the cold period of year. In the period 2001–2012 (from November to March), episodes with temperature changes from positive to negative and vice versa (thaw-freeze and freeze-thaw cycles) and the effects of wet soil surfaces in connection with aggregate disintegration, are identified. The data are spatially interpolated by GIS tools for areas in the Czech Republic with heavy-textured soils. Blending critical categories is used to locate potential risks. The level of risk is divided into six classes. Those areas identified as potentially most vulnerable are the same localities where the highest number of erosive episodes on heavy-textured soils was documented.
Biomedical Waste Management
Authors: Shikoska Biljana , Dimova Cena , Schumanov Gjorgji , Vankovski Vlado 
Published: May 2018

Abstract
Medical waste is all waste material generated in health care facilities, such as hospitals, clinics, physician’s offices, dental practices, blood banks, and veterinary hospitals/ clinics, as well as medical research facilities and laboratories. Poor management of health care waste potentially exposes health care workers, waste handlers, patients and the community at large to infection, toxic effects and injuries, and risks polluting the environment. It is essential that all medical waste materials have to be segregated at the point of generation, appropriately treated and disposed of safety.
The Role of Standardized Echography in Preoperative Preparations of Patients with Senile Cataract
Authors: Ivanova Gordana , Gjosevska Dastevska Emilija 
Published: May 2018

Abstract
Introduction. The standardized echography is a non-invasive, simple, efficient and painless diagnostic method, which allows visualization and evaluation of posterior eye segment through non-transparent media, such as blurring lens or cataract. The aim of the study was to emphasize the role and importance of standardized echography in preoperative preparation of patients and evaluation of posterior eye segment in patients with senile cataracts.
Methods. During a 6 month-period, from 05.05.2015 to 11.05.2015, a total of 718 ultrasound examinations were made in patients with previously diagnosed senile cataracts at the University Clinic for Eye Diseases in Skopje, in the Echography cabinet. Examinations were made by using the apparatus Sonomed E-Z Scan-AB 5500+.
Results. Out of the total number of 718 patients with senile cataracts examined by echography-in 295 (24.30%) opacities in the vitreous body were diagnosed, in 128 (18.08%)-posterior vitreous detachment, in 8 (1.11%) synchysis scintillans, in 5 (0.70%) hemophthalmus and in 3(0.42%) detachment of the retina. A total of 302 (42.06%) patients were with normal echographic findings.
Conclusion. The results obtained indicate the necessity of preoperatively echographic examination in patients with senile mature and hypermature cataracts.