bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation of university students’ problematic usage of mobile phone in the context of personality<p>Üniversite öğrencilerinde cep telefonunun problemli kullanımının kişilik bağlamında incelenmesi
Authors: Kutlu Mustafa , Pamuk Mustafa 
Published: April 2017

Aim of this study is to examine problematic usage of mobile phone in the context of big five personality among university students. 103 male and 182 female, totally 285 university students who were from different Departments of Faculty of Education composed participants of the study in the spring period 2015-2016 academic year. Problematic mobile phone usage scale (PMPUS) and Quick Big Five Personality Test (QBFPT) were applied to 285 students, who were participants of the study. To analyse these data, Pearson’s Correlation Coefficient, Cronbach’s Alpha Coefficients, skewness, kurtosis, t test, and multiple regression were used. According to results obtained from the study, there was no significant difference between male and female in relation to problematic usage of mobile phone. Furthermore, agreeableness, extraversion, and openness to experience didn’t statistically predict to problematic usage of mobile phone, but conscientiousness and emotional stability statistically did. Discussion and some suggestions have been made based on the findings. ÖzetBu araştırmanın amacı üniversite öğrencilerinin cep telefonlarını problemli kullanma davranışlarını beş büyük kişilik bağlamında incelemektir. Araştırmanın katılımcılarını 2015-2016 Eğitim-Öğretim sezonunun bahar döneminde Eğitim Fakültesi’nde öğrenim görmekte olan 103’ü erkek, 182’si kadın olan toplamda 285 üniversite öğrencisi oluşturmaktadır. Araştırmanın katılımcılarına üniversite öğrencileri için problemli cep telefonu kullanım ölçeği (PCTKÖ) ve hızlı büyük beşli kişilik testi (HBBKT) uygulanmıştır. Elde edilen verilerin analizinde Pearson Korelasyon Katsayısı, iç tutarlılığa ilişkin güvenirlik katsayısını hesaplamak için Cronbach Alpha katsayıları, basıklık ve çarpıklık değerleri, cep telefonunun problemli kullanımının cinsiyete göre farklılaşıp farklılaşmadığını belirlemek için t testi ve son olarak da beş kişilik faktörünün cep telefonunun problemli kullanımını yordayıp yordamadığına ilişkin çoklu regresyon analizi yapılmıştır. Araştırmadan elde edilen sonuca göre, cep telefonunun problemli kullanımı cinsiyete göre istatistiksel olarak anlamlı bir farklılığın olmadığı bulunmuştur. Ayrıca uyumluluk, dışadönüklük ve deneyime açıklık kişilik faktörlerinin cep telefonunun problemli kullanımını istatistiksel olarak anlamlı bir şekilde yordamadığı; ancak duygusal denge ve sorumluluk kişilik faktörlerinin istatistiksel olarak anlamlı bir şekilde yordadığı belirlenmiştir. Elde edilen bulgulara dayalı olarak önerilerde bulunulmuş ve tartışılmıştır.
Cavitation erosion degradation of Belzona®coatings
Authors: Bolewski Ł. , Szkodo M. , Kmieć M. 
Published: April 2017

AbstractIn hydrocarbon and maritime industry there is a constant need of materials and coatings withstanding severe conditions. One of adverse phenomena present there is cavitation erosion. The paper presents evaluation of cavitation resistance of three different steel coatings. Belzona 2141 (ACR-Fluid Elastormer), 1321 (Ceramic S-Steal) and 5831 (ST-Barrier) were deployed on P110 steel and subjected to ultrasound cavitation in distilled water and drilling mud environment. According to mass loss measurements Belzona 2141 shows superior performance comparing to two other coatings and bare p110 steel surface. This is due to its high elasticity comparing to steel.
Behavior of triplex steel containing different aluminum content
Authors: Masoud M. I. , Tashkandi M. , Al-Jarrah J. , Farahat A. I. Z. 
Published: April 2017

Abstract
Medium-carbon alloy steels containing different aluminum contents were hot forged by 95% reduction at 1200°C followed by air cooling. Optical and scanning electron microscopes were used to investigate the morphologies of the different phases present. An austentizing process followed by water quenching (after hot forging) was carried out to obtain different hardness values. The intensity of the different planes was investigated using X-ray diffraction. The mechanical properties were characterized using tensile and hardness tests. Optical and scanning electron micrographs revealed a great effect of aluminum content on the steel properties. A matrix of bainite and pearlite and traces of ferrite was revealed for hot forged steel type 1 containing 1% Al. Steel type 2 containing 2% Al showed a matrix of pearlite and ferrite with the absence of bainite. The hardness increased with increasing the temperature to a maximum value then decreased for steel containing 1 and 2% aluminum. After austentizing at 925°C, the maximum hardness of 649Hv was recorded for hot forged steel type 2 of 2% aluminum, while steel type 1 of 1% aluminum showed a maximum hardness of 531Hv after austentizing at 1000°C. Thus, the maximum hardness of hot forged steels decreased with increasing aluminum content. In addition, the maximum tensile and yield strength were decreased by increasing the aluminum content in the steel. The changes in microstructure and mechanical properties of these steels could be explained by the effect of aluminum as a ferrite forming element.
Optimal design of a composite propellant formulation using response surface methodology
Authors: Hamed J. O. , Ogunleye O. O. , Osheku C. A. 
Published: April 2017

Abstract
There is a continuous demand for high performance composite propellant formulations to meet mission requirements. The performance of composite propellant formulations can be enhanced by optimizing propellant formulation. However, the main objective of this study is to formulate a composition for composite propellant by optimizing the specific impulse which is the measure of propellant performance. A central composite design (ccd) consisting five ingredients (ammonium nitrate, powdered aluminum, polyester resin, ammonium dichromate and powdered charcoal) at five levels was used to formulate optimum propellant formulation from composite materials of ammonium nitrate based propellant verified for propellant characteristics using propellant performance evaluation programme (propep 3). The responses evaluated are specific impulse, characteristic velocity, density, temperature and molecular weight. Response surface methodology was used to analyze the results of the ccd of the composite formulations. The optimum values for specific impulse, characteristic velocity, density, temperature and molecular weight of the mixture from the surface plot are 212.178 s, 1335.81 m/s, 1640.6 k g/m3, 1968.73 k and 21.7722 g/mol respectively. The optimum predicted specific impulse was 212.178 s at composite composition of 73.61% ammonium nitrate, 4.36% powdered aluminum, 14.39% polyester resin, 5.10% ammonium dichromate and 2.54% powdered charcoal. The propellant optimum composition validated with propep 3 are in good agreement with each other in their accompany propellant characteristics. Therefore, the optimal propellant formulation enhanced the performance of solid propellants.
Application of metric entropy for results interpretation of composite materials mechanical tests
Authors: Garbacz G. , Kyzioł L. 
Published: April 2017

Abstract
In this paper the results of mechanical studies of the Aropol 536 composite on the epoxy-resin base are described. The aim of the studies was to measure elastic-plastic changes in the composite during its deformation. The obtained results were analyzed using Kolmogorov-Sinai metric entropy. The entropy was computed applying phase portraits reconstructed from a phase plane using delayed coordinates. Resolution of the particular experimental setup limits the number of the acquired data points, i.e., from several to tens of thousands of points and it has significant influence on accuracy of the obtained results. In conclusion, in the tested composites elastic-plastic deformations are periodic and repeat in a distinctive way in a wide range of deformations of the sample. Deformation of the elastic-plastic composite are associated with its complex structure and studies of its mechanical properties require more advanced methods such as use of Kolmogorov-Sinai metric entropy.
Peculiarities of Zigzag Behaviour in Linear Models of Ship Yaw Motion
Authors: Artyszuk Jarosław 
Published: April 2017

Abstract The present survey, as part of larger project, is devoted to properties of pure linear models of yaw motion for directionally stable ships, of the first- and second-order, sometimes referred to as the Nomoto models. In rather exhaustive way, it exactly compares and explains both models in that what is being lost in the zigzag behaviour, if the reduction to the simpler, first-order dynamics (K-T model) is attempted with the very famous [Nomoto et al., 1957] approximation: T = T1 + T2 - T3. The latter three time constants of the second-order model, more physically sound, are strictly dependent on the hydrodynamic coefficients of an essential part of the background full-mission manoeuvring model. The approximation of real ship behaviour in either of the mentioned linearity orders, and the corresponding complex parameters may facilitate designing and evaluating ship steering, and identifying some regions of advanced nonlinear models, where linearisation is valid.As a novel outcome of the conducted investigation, a huge inadequacy of such a first- -order model for zigzag simulation is reported. If this procedure is used for determining steering quality indices, those would be of course inadequate, and the process of utilizing them (e.g. autopilot) inefficient.
Algorithms of Position and Velocity Estimation in GPS Receivers
Authors: Kaniewski Piotr , Gil Rafał , Konatowski Stanisław 
Published: April 2017

Abstract Processing of signals in Global Positioning System (GPS) receivers includes numerous signal and data operations leading to calculation of coordinates and velocities of satellites in global Earth-Centered Earth-Fixed (ECEF) frame of reference as well as pseudoranges and delta-ranges between the user and all the tracked GPS satellites. Further processing of these data consists in estimation of the user’s position, velocity and time (PVT) and nowadays it is usually realized by means of an Extended Kalman Filters (EKF). The choice of measuring data processed by the Kalman filter significantly influences the accuracy of navigation solution. In simpler GPS receivers, the estimation of user’s position and velocity is based on pseudoranges only, whereas in more advanced ones delta-ranges are also applied. The paper describes both possible solutions and compares the accuracy of estimation of the user’s position and velocity in both cases. The comparison is based on simulation results, which are included in the paper.
Global Satellite Navigation Systems at High Latitudes, Visibility and Geometry
Authors: Januszewski Jacek 
Published: April 2017

Abstract Since few years the significance of the navigation at high latitudes (60° and more), increases incessantly, e.g. northern passages between Atlantic and Pacific Waters. In these regions the user’s position can be obtained mainly from global satellite navigation systems (SNS). Nowadays (September 2016) two systems, American GPS and Russian GLONASS, are fully operational, two next, Galileo in Europe and BeiDou in China, are under construction. As the error of user’s position obtained from these systems depends on geometry factor DOP (Dilution Of Precision) among other things the knowledge of the number of satellites visible by this user above given masking elevation angle Hmin and the distributions of DOP coefficient values, GDOP in particular, is very important. The lowest and the greatest number of satellites visible in open area by the user at high latitudes for different Hmin, the percentage of satellites visible above angle H, distributions of satellites azimuths and GDOP coefficient values for different Hmin for all these four SNSs at different user’s latitudes (beginning from 60°) and other distributions are presented in the paper. All calculations were made for constellation of BeiDou 27 MEO satellites, Galileo 24 satellites, GLONASS 24 and GPS 31 satellites.
Architecture of Maritime Awareness System Supplied with External Information
Authors: Stróżyna Milena , Małyszko Jacek , Węcel Krzysztof , Filipiak Dominik , Abramowicz Witold 
Published: April 2017

Abstract In this paper, we discuss a software architecture, which has been developed for the needs of the System for Intelligent Maritime Monitoring (SIMMO). The system bases on the state-of-the-art information fusion and intelligence analysis techniques, which generates an enhanced Recognized Maritime Picture and thus supports situation analysis and decision- making. The SIMMO system aims to automatically fuse an up-to-date maritime data from Automatic Identification System (AIS) and open Internet sources. Based on collected data, data analysis is performed to detect suspicious vessels. Functionality of the system is realized in a number of different modules (web crawlers, data fusion, anomaly detection, visualization modules) that share the AIS and external data stored in the system’s database. The aim of this article is to demonstrate how external information can be leveraged in maritime awareness system and what software solutions are necessary. A working system is presented as a proof of concept.
Analysis of Sea Accidents (2002–2015)
Authors: Dyrcz Czesław 
Published: April 2017

Abstract In the paper the issue of maritime safety is presented. Most of the modern world trade is carried by sea, where maritime safety plays a key role. The article also presents the analysis of marine casualties at the beginning of the 21st century, covering the years 2002-2015. Apparent systematic steady decline in accidents and total losses of vessels is the result of improved maritime safety.
Application for Simulating Gyro-Compass Behavior
Authors: Jaskólski Krzysztof 
Published: April 2017

Abstract Resolution of International Maritime Organization (IMO Res. A.424 (XI)), International Convention for the Safety of Life at Sea (SOLAS V/19.2.5) and consequently ‘Provisions Survey of Ships Marine’, part V, contained in the Polish Register of Shipping impose an obligation to fit ships with gyro-compass as one of the most complex marine equipment has found in the curricula of seafarers at the operational level (IMO Model Course 7.03). Curriculum involves the use real navigation devices. In addition, the adaptation of teaching facilities to meet the needs of the training process often requires the development of educational aids in the form of simulators and applications that represent the construction and operation of navigation devices. The article presents possibilities of the application - gyro-compass simulator developed for the requirements of the Institute of Navigation and Maritime Hydrography PNA. Among others, the program is used to simulate the conditions in which you can expect the occurrence of different types of gyro-compass deviation. Designed software is expected to improve the educational process, to help the students assimilate the content of the curriculum in the field of classic gyro-compasses and familiarize trainees with static and dynamic errors occurring with the change of operating conditions.
Estimation of Effective Swath Width for Dual-Head Multibeam Echosounder
Authors: Grządziel Artur , Wąż Mariusz 
Published: April 2017

Abstract Many surveying companies and maritime institutions are now using multibeam systems for their operations, either offshore or in coastal and inland waters. Since the time the first multibeam echosounder appeared (late 1970s) the technology has advanced enormously. Modern systems now boast far greater angular coverage (typically 120°-150°) and form hundreds of beams. Dual-head multibeam systems can potentially cover the entire sector (180°) underneath the ship. However surveyors must be aware that the outer beams of these acoustic systems return the most errors causing that the effective swath width is shorter than what the manufacturers declare. The paper presents the methods of estimating of effective (usable) swath width of dual-head multibeam echosounder EM 3002D. Results of the hydrographic survey performed by the polish navy survey ship ORP ‘Arctowski’ have been showed in the article.
Automatic Determination of Car Movement Parameters Based On Image Detection
Authors: Marchel Łukasz 
Published: April 2017

Abstract This article presents alternative way of distance measurement to the preceding vehicle. Investigations were conducted for the purpose of assessing the possibility of using automatic determination of a car plate size in a photograph picture, and basing on that computing range to a vehicle. The first part describes the research methodology relating to angular measurements made with a still camera, The second part includes the method employed to automatically detect area occupied by a registration plate in a picture of a vehicle. The final part contains the mechanism of calculating distance to a car and the results of the investigation which justify using described method as a tool for range measurement.
Jamming as a Threat to Navigation
Authors: Świerczyński Sławomir , Zwolan Piotr , Rutkowska Ilona 
Published: April 2017

Abstract The whole world is dependent on satellite systems as they are used in almost all fields of economic and social life, in transport, banking, industry, agriculture, etc. Thanks to the development of technology, most smartphones used everyday have been equipped with a built-in GNSS receiver, many cars with navigation systems and all vessels with GNSS receiver or a satellite compass for navigation. Systems working on similar frequencies can be used for jamming or spoofing satellite systems. Such purposeful system jamming can be damaging to users and society as a whole. This article includes a description of jamming and a presentation of one of possible receiver designs allowing for jamming signal detection. This receiver has been designed and built by the authors of the article.
The GNSS System Application in the LPV-200 Landing Approach Procedure. Part I : Approach to Practical Verification
Authors: Grzegorzewski Marek , Śliwak Karol Krzysztof 
Published: April 2017

Abstract Current RNAV GNSS approach procedures are widely used in Europe and worldwide. The development of the GNSS systems as well as the study and control of satellite signals result in the increasing number of approach types with increasingly higher demands and lower operating minimums. LPV-200 is the precision approach with the most stringent requirements, and operational minimums of up to 200ft. For the purposes of Part I of this paper static measurements were performed in order to compare the signal characteristics with ICAO requirements. On the basis of the measurements′ results, it can be assumed that, within the analyzed period of time, the GNSS signal at the airport in Dęblin only partially met the requirements set for LPV-200 approaches. The data collected were processed and analyzed using Matlab environment.
Giant Tonsil Teratoma
Authors: Dinca D. 
Published: April 2017

Abstract
The case presented is one extremely rare of giant tonsil teratoma with oropharynx localization, with palatine left tonsil origin, inducing respiratory failure, swallowing and phonetic disorders.
This paper is based in a study case of a giant tonsil pediculous teratoma with slow evolution, with tolerancy, due to some diagnosis errors, developing respiratory failure and swallowing difficulties.
Postoperative Comparison In Open Vs. Laparoscopic Ventral Hernia Repair In Obese Patients
Authors: Dogaru Iuliana , Avram M. , Gherghinoiu M. , Morosan V. , Ciufu N. , Vinca Alina Ioana , Hritcu M. D. 
Published: April 2017

Abstract
Introduction: Obesity is an important problem in our society. Recent studies shows that laparoscopic ventral hernia repair has advantages in obese patients comparing with the standard open approach. This study wants to compare length of stay (LOS), hospitalization costs (HC) and operative time (OT) in laparoscopic and open ventral hernia repair.
Methods: A retrospective study of obese patients (BMI>30kg/m2) that underwent ventral hernia repair between 2014 and 2015 were included. We compared demographics, hernia size, OT, LOS, HC between the two approaches.
Results: 100 patients with ventral hernia repair were included, 11 had laparoscopic approach (11%). Laparoscopy was performed only in elective surgery and for small defects. The operation time was almost the same (119.09 vs.118.87 min). The length of stay was significantly longer in open approach (8.53 vs. 2.9 days) and hospitalization costs were higher for laparoscopic repair.
Conclusions: Laparoscopy offers a better length of stay, but the costs remains higher for this approach.
The Role Of Fibroscan In Detecting Hepatic Fibrosis Induced By Methotrexate
Authors: Iliescu Madalina , Craciun R. L. , Stavar Angelica Nela 
Published: April 2017

Abstract
Introduction: Liver represents the main place of drug metabolisation. Drugs and toxic substances reach the level of liver after absorption at gastro-intestinal level. Drug hepatotoxicity represents an important chapter of iatrogenic pathology, because the hepatic lesions induced by drugs include extremely diverse clinical, biological and histological expressions that can take the aspect of any form of acute or chronic hepatobiliary disease. Hepatic lesions induced by drugs (LHIM) represent a histological and/or biochemical alteration caused and attributed to the consumption of a drug. Hepatic elastography (Fibroscan) represents a noninvasive method of quantification of hepatic fibrosis.
Material and method: We carried out a retrospective study and longitudinally prospective study that included a set of patients under treatment with Methotrexate, amounting to 76, divided into 2 subsets: a subset consisting of patients with hepatitis to Methotrexate, subset 1, of 23 patients, a subset of patients under treatment with Methotrexate but with normal hepatic samples, subset b, of 53 patients.
Results: We carried out fibroscan at all the patients treated with Methotrexate, obtaining a medium score of fibrosis of 6.23 for the subset a with hepatitis at Methotrexate and of 5.33 for the subset b with normal hepatic samples. We made a correlation between the cumulated dose of Methotrexate and the change of hepatic samples.
Conclusions: There is a significant correlation between hepatic fibrosis induced by Methotrexate and the cumulated dose of Methotrexate. The possibility of utilization of fibroscan which is a completely painless method, reproducible, for the monitoring of the treatment with Methotrexate both at patients with changed values of the hepatic tests as weir as those with normal values must be considered.