bluuebunny/crossref_metadata_2025_split huggingface dataset:
Propeller Hydrodynamic Characteristics in Oblique Flow by Unsteady Ranse Solver
Authors: Nouroozi Hossein , Zeraatgar Hamid 
Published: May 2020

Abstract
Propellers may encounter oblique flow during operation in off-design conditions. Study of this issue is important from the design and ship performance points of view. On the other hand, a propeller operating in oblique flow may sometimes result in a better propulsion efficiency. The main goal of the present study is to provide an insight on the propeller characteristics in the oblique flow condition. In this research, the performance of the DTMB 4419 propeller is studied by the numerical method based on solving Reynolds Averaged Navier–Stokes (RANS) equations in several inflow angles. The sliding mesh approach is used to model the rotary motion of the propeller. Initially, the numerical method is verified by grid and time step dependency analysis at various inflow angles. Additionally, computed results at zero inflow angle are compared with the available experimental data and good agreement is achieved. Finally, the forces and moments acting on the propeller are obtained for 0° to 30° inflow angles. It is concluded that the inflow angle up to 10° has no significant influence on the thrust and torque coefficients as well as the propeller efficiency. However, at high angles up to 30°, the thrust and torque coefficients increase as the inflow angle increases, which may result in a significant improvement of propeller efficiency.
Generation of H2 on Board Lng Vessels for Consumption in the Propulsion System
Authors: Fernández Ignacio Arias , Gómez Manuel Romero , Gómez Javier Romero , López-González Luis M. 
Published: May 2020

Abstract
At present, LNG vessels without reliquefaction plants consume the BOG (boil-off gas) in their engines and the excess is burned in the gas combustion unit without recovering any of its energy content. Excess BOG energy could be captured to produce H2, a fuel with high energy density and zero emissions, through the installation of a reforming plant. Such H2 production would, in turn, require on-board storage for its subsequent consumption in the propulsion plant when navigating in areas with stringent anti-pollution regulations, thus reducing CO2 and SOX emissions. This paper presents a review of the different H2 storage systems and the methods of burning it in propulsion engines, to demonstrate the energetic viability thereof on board LNG vessels. Following the analysis, it is identified that a pressurised and cooled H2 storage system is the best suited to an LNG vessel due to its simplicity and the fact that it does not pose a safety hazard. There are a number of methods for consuming the H2 generated in the DF engines that comprise the propulsion plant, but the use of a mixture of 70% CH4-30% H2 is the most suitable as it does not require any modifications to the injection system. Installation of an on-board reforming plant and H2 storage system generates sufficient H2 to allow for almost 3 days’ autonomy with a mixture of 70%CH4-30%H2. This reduces the engine consumption of CH4 by 11.38%, thus demonstrating that the system is not only energy-efficient, but lends greater versatility to the vessel.
Modelling and Optimisation of Vacuum Collection System for Cruise Ship Kitchen Garbage
Authors: Jun Du , Ruonan Li , Xin Wu , Hang Zhao 
Published: May 2020

Abstract
Pollution of the marine environment by ship garbage is an urgent problem to be solved at home and abroad. The ship kitchen garbage vacuum collection system is a new environmental protection scheme for garbage disposal. It has many advantages, such as using a pipeline instead of manual operation, creating high-level sanitary conditions, realising completely closed garbage collection and transportation, eliminating cross-pollution, saving space and so on. In this paper, the system is modelled, and the calculation of pipeline pressure loss, the vacuum degree of the vacuum tank and the energy consumption of the system are briefly introduced. In order to reduce the energy consumption, an algorithm for the emptying and discharging port is presented. In order to solve the problem of optimising relevant parameters, the vacuum transport mechanism of garbage is studied based on an optimisation model of the pipe network, and the experimental platform of a simulation device is set up. In engineering, this is of great significance to the design of cruise ship garbage collection and treatment systems and the development of supporting technology.
Application of Vibroacoustic Diagnosis in Assessing Bridges Connecting Teeth and Implants to Treat Tooth Absence in Sea Vessel Crews
Authors: Rasinski Artur , Klekot Grzegorz , Skopiński Piotr 
Published: May 2020

Abstract
Implant treatment is a proven method in dentistry for partial and complete missing teeth reconstruction. In some clinical situations it is advisable to limit the number of implants, which can be obtained by making a bridge connecting the patient’s own tooth with the implant. So far, the possibility of using safe and permanent connections of natural teeth with implants has been examined to a small extent due to the dangers resulting from the different mobility of dental implants and teeth.
An attempt was made to use vibro-acoustic techniques to evaluate various combinations of teeth and implants. Pilot studies were carried out on cadavers-pig mandibles with implants. There were recorded sounds in the immediate vicinity of the mandible formed in response to impulse excitations carried out with a point hit against a tooth or implant before and after their joining with a bridge. The comparison of spectra allows to see features indicating a high probability of being able to distinguish between the examined configurations.
The results of the research should contribute to a better understanding of the mutual relations between the dental implant and the tooth, which are included in bridge. In the perspective, it will enable to assess the level of safety and to identify clinical situations that allow to obtain dental bridges based on teeth and implants.
NoMoATS: Towards Automatic Detection of Mobile Tracking
Authors: Shuba Anastasia , Markopoulou Athina 
Published: May 2020

Abstract
Today’s mobile apps employ third-party advertising and tracking (A&T) libraries, which may pose a threat to privacy. State-of-the-art detects and blocks outgoing A&T HTTP/S requests by using manually curated filter lists (e.g. EasyList), and recently, using machine learning approaches. The major bottleneck of both filter lists and classifiers is that they rely on experts and the community to inspect traffic and manually create filter list rules that can then be used to block traffic or label ground truth datasets. We propose NoMoATS – a system that removes this bottleneck by reducing the daunting task of manually creating filter rules, to the much easier and scalable task of labeling A&T libraries. Our system leverages stack trace analysis to automatically label which network requests are generated by A&T libraries. Using NoMoATS, we collect and label a new mobile traffic dataset. We use this dataset to train decision tree classifiers, which can be applied in real-time on the mobile device and achieve an average F-score of 93%. We show that both our automatic labeling and our classifiers discover thousands of requests destined to hundreds of different hosts, previously undetected by popular filter lists. To the best of our knowledge, our system is the first to (1) automatically label which mobile network requests are engaged in A&T, while requiring to only manually label libraries to their purpose and (2) apply on-device machine learning classifiers that operate at the granularity of URLs, can inspect connections across all apps, and detect not only ads, but also tracking.
SoK: Differential privacies
Authors: Desfontaines Damien , Pejó Balázs 
Published: May 2020

AbstractShortly after it was first introduced in 2006,differential privacybecame the flagship data privacy definition. Since then, numerous variants and extensions were proposed to adapt it to different scenarios and attacker models. In this work, we propose a systematic taxonomy of these variants and extensions. We list all data privacy definitions based on differential privacy, and partition them into seven categories, depending on which aspect of the original definition is modified.These categories act like dimensions: variants from the same category cannot be combined, but variants from different categories can be combined to form new definitions. We also establish a partial ordering of relative strength between these notions by summarizing existing results. Furthermore, we list which of these definitions satisfy some desirable properties, like composition, postprocessing, and convexity by either providing a novel proof or collecting existing ones.
Angel or Devil? A Privacy Study of Mobile Parental Control Apps
Authors: Feal Álvaro , Calciati Paolo , Vallina-Rodriguez Narseo , Troncoso Carmela , Gorla Alessandra 
Published: May 2020

Abstract
Android parental control applications are used by parents to monitor and limit their children’s mobile behaviour (e.g., mobile apps usage, web browsing, calling, and texting). In order to offer this service, parental control apps require privileged access to system resources and access to sensitive data. This may significantly reduce the dangers associated with kids’ online activities, but it raises important privacy concerns. These concerns have so far been overlooked by organizations providing recommendations regarding the use of parental control applications to the public.
We conduct the first in-depth study of the Android parental control app’s ecosystem from a privacy and regulatory point of view. We exhaustively study 46 apps from 43 developers which have a combined 20M installs in the Google Play Store. Using a combination of static and dynamic analysis we find that: these apps are on average more permissions-hungry than the top 150 apps in the Google Play Store, and tend to request more dangerous permissions with new releases; 11% of the apps transmit personal data in the clear; 34% of the apps gather and send personal information without appropriate consent; and 72% of the apps share data with third parties (including online advertising and analytics services) without mentioning their presence in their privacy policies. In summary, parental control applications lack transparency and lack compliance with regulatory requirements. This holds even for those applications recommended by European and other national security centers.
Long-Term Observation on Browser Fingerprinting: Users’ Trackability and Perspective
Authors: Pugliese Gaston , Riess Christian , Gassmann Freya , Benenson Zinaida 
Published: May 2020

AbstractBrowser fingerprinting as a tracking technique to recognize users based on their browsers’ unique features or behavior has been known for more than a decade. We present the results of a 3-year online study on browser fingerprinting with more than 1,300 users. This is the first study with ground truth on user level, which allows the assessment of trackability based on fingerprints of multiple browsers and devices per user. Based on our longitudinal observations of 88,000 measurements with over 300 considered browser features, we optimized feature sets for mobile and desktop devices. Further, we conducted two user surveys to determine the representativeness of our user sample based on users’ demographics and technical background, and to learn how users perceive browser fingerprinting and how they protect themselves.
2L of Polyethylene Glycol as the Main Small Bowel Cleansing Regimen Component Prior to Video Capsule Endoscopy: Interim Analysis
Authors: Derovs Aleksejs , Derova Jeļena , Kleina Regīna , Pokrotnieks Juris 
Published: May 2020

Abstract
Capsule Enteroscopy (CE) is a fundamentally new method in diagnostic endoscopy. However, there are several factors influencing the quality of this procedure, including impermeable fluids, food remains etc. The aim of the study was to assess one of the most popular currently used bowel preparation methods and evaluate possible effects of various factors. 136 CE examinations were analysed. Each patient was prepared using 2 litres of polyethylene glycol (PEG) one day prior to examination. There was a special form filled in for each patient, which included relevant parameters (anamnesis, CE data etc.). Of 136 CE cases, 84 (61.8%) were female patients and 52 (38.2%) were male. The small bowel (SB) transit time in 112 patients varied from 39 to 502 minutes, but in 24 cases the capsule did not reach caecum. The degree of bowel cleanliness was as follows: very good — 30 (22.1%) patients, satisfactory — 97 (71.3%), and poor — 9 (6.6%). A positive correlation was observed between the degree of SB cleanliness and the SB transit time (p = 0.015). A longer SB transits time was associated with poor SB cleanliness. The results obtained in this study showed that the quality of SB cleanliness is affected by SB transit time. A relatively large percentage of cases rated as satisfactory bowel cleanliness and comparatively small percentage of bowel cleanliness cases rated as “very good” were observed when 2 litres of PEG were used prior to CE, indicating an important issues in preparation of the bowel prior to CE.
Pathogenic Escherichia coli Among Asymptomatic Children and Associated Factors
Authors: Zelča Egija , Brūmane Aiva , Kārkliņa Daiga , Perminovs Dmitrijs , Gavars Mikus , Remberga Silvija , Rumba-Rozenfelde Ingrīda , Daugule Ilva 
Published: May 2020

Abstract
Although Escherichia coli is a part of the commensal flora of the gastrointestinal tract, pathogenic types of E. coli can cause diarrhea, especially in children. Pathogenic types are found also in healthy individuals, but prevalence of pathogenic E. coli among asymptomatic children varies and has not been studied in Latvia. The aim of the study was to determine prevalence of pathogenic E. coli among asymptomatic children and identify factors associated with presence of bacterium. Children (aged 0.5–8 years) without acute gastrointestinal symptoms were included in a cross-sectional study. Parents were asked to answer a questionnaire (demographic data, parental education, type of delivery, breastfeeding, antibacterial therapy, and allergic diseases) and bring a faecal sample of their child. The prevalence of pathogenic E. coli was detected by polymerase chain reaction and analysed in respect to risk factors. Statistical analyses included Chi-Square test, one-way ANOVA, and logistic regression. The patient sample group contained 245 children, mean age 4.5 SD ± 2.1; 46.5% (114/245) had allergies. In total, 16% (39/245) of isolates were positive for pathogenic E. coli. Prevalence of pathogenic types of E. coli was significantly higher among children without allergy compared to children with allergy: 21% (27/131) vs. 11% (12/114), p = 0.03. Prevalence did not differ significantly in respect to other studied factors. In logistic regression analysis pathogenic E. coli positivity was inversely associated with presence of allergy (OR = 0.45, CI: 0.21–0.94, p = 0.03). Asymptomatic carriage of pathogenic E. coli was identified in our paediatric patient sample and was inversely associated with an allergic disease. Microbiota changes related to pathogenic E. coli, as well as duration of carriage of bacterium, should be studied further.
2. Achieving Harmony Through Music: A Comparison Between Ancient Greek and Chinese Thought
Authors: Marisi Rossella 
Published: May 2020

Abstract
Ancient Greek and Chinese philosophers held music as a fundamental component of education and deemed it effective in guiding students at gaining harmony within themselves and with one another. A quality music education was thus considered relevant in the Bildung of individuals, the preservation of the state, and the maintenance of harmony between heaven and earth. This study makes a comparison between the thought of Plato and his Greek predecessors on one side, and the one of Confucianism on the other, identifying fascinating similarities which offer a source of inspiration to modern educators.
11. The Vocal-Chamber Music Recital – Theoretical and Practical Aspects of an Interdisciplinary Approach
Authors: Petrescu Cezara Florentina , Petrescu Alexandru Radu 
Published: May 2020

Abstract
In a world of spectacle in which everything seems to have already been told, the vocal-chamber music recital is found in an identity crisis. The economic, social and cultural context in which it takes place is labile and determines the performers to ask themselves what is their position within the sctructures in which they function/operate. The purpose of the research is to identify and reevaluate links, configurations, structures and elements of a type of an aparently morally obsolet musical performance and marked by the passage of time. The originality of the thesis spans from its interdisciplinary character and from its multifaceted approach of the performative phenomenon.
1. Historical Evolution of Adagio (Analysis of the Choreographic Concept)
Authors: Todi Cristina 
Published: May 2020

Abstract
By this study we propose to expose the steps that led to the development of the choreographic adagio. Without excluding the importance of the precursory period, the approach of the discourse introduces us into the middle of the 18th century, exactly in the age when this miracle of dancing began to assume clear contours. We remind of the entrées full of effects with high elevations of Auguste Vestris, the expressivity of Marie Salle, the Noverian manifesto certainly the pas de deux formula - which is used even nowadays - of Marius Petipa. The transformations of the subjects - from the mythology to the eternal theme of love - are completed by the different states of the danced dialogue. The deciphering of the symbols founding its gesticulation and explains the step or the choreographic element is visible through the scene of the balcony of ballet Romeo and Juliet by Prokofiev and by the meeting between Spartacus and Flavia in the ballet of Avram Haciaturian. The state of poetry, of dreaming, noble rise of the soul towards unsuspected horizons, the adagio, confesses to us its filiation even beyond the border of the age. We consider that this paper is useful both for the teaching staff who must instruct the youngsters in vocational schools a profound and qualitative choreographic culture, and to those who are training in the art of dance.
2. Development of Artistic Creativity in Students by Studying and Applying Ornamental Motives in the Textile Art Course
Authors: Arbuz-Spatari Olimpiada 
Published: May 2020

Abstract
In the training process within the textile art course, a system of methods of studying and applying the elements of the plastic language is used within the proposed methodology, which was followed by the development of artistic creativity in the students of the plastic art faculty. These methods were developed and applied in the course of textile art for the compartments: elaboration of creative compositions; consciously applying the elements of plastic language; studying and applying ornamental motifs in the textile art course. The methods developed for the textile art course, in their interaction, will contribute to the development of the student’s artistic creativity, helping him to execute the creative product in the field of textile arts.
5. The Innovative Praxeology: Suggestions for Implementing in Artistic Education
Authors: Bularga Tatiana 
Published: May 2020

Abstract
The process of artistic perception in instructive and formative actions is identified with the educative action itself. In this process the considerable weight rests on the participative state kid to the design, development and evaluation/self-evaluation (through prescription of individual behavioural maps, anticipating practical actions, varying operations, performing the tasks by choosing the optimal variants for solving) and the dynamics of professional competence of teachers to achieve gradually the theoretical design process and practical actuating, by identifying educational content and valuable actions, diagnosing the individual resources, planning, forming hypotheses, sequential and final evaluation. In our statements we proceed from the reality that the artistic activity differs much from other human activities through its ontological specifics, which requires taking into account the opportunities and challenges that arise in individual potential manifestation of the child, act that expresses by transposing the theoretical prescriptions into practical actions indisputable by the presence of emotional-affective reactions, by developing projects and logistical maps of action, is not waiting for certain stimuli coming from outside, but by enhancing the artistic intentions and decisions of child – subjects of education.
11. “Seeing Is Believing”: The Importance of Visual Factors in Music Performance Assessment
Authors: Iușcă Dorina Geta 
Published: May 2020

Abstract
The criteria recommended for the performance of internal assessment are the ones included in the national model for school inspection applied by the inspectors in the school inspectorate or the Ministry of Education (with subsequent names) who carry out internal assessments. Educational establishments can also decide on certain additional criteria - in line with the specific needs. All educational establishments must perform the annual assessment of activity, regarding school development, educational programs, curricular and extracurricular activities, quality of the teaching-learning process, human resources development, relations with the community and European dimension in the education offered. A tricky problem is represented by the specific assessment of Children Centres and Clubs that carry out non-formal activity, without school programs and handbooks approved by the Ministry of Education. Carrying out an analysis of the manner of assessing formal and non-formal educational units, the need to readjust the internal and external assessment was identified. At the level of school inspectorates, school inspection is carried out by a team consisting of specialised inspectors who know the specificity of those educational units. The main problem is represented by the external assessment carried out by ARACIP with the help of standard specific means: fields, indicators, reference descriptors and specific descriptors. Through the study performed, a series of proposals on the beneficial amendments for the quality assessment within Children Centres and Clubs is identified.
Housing Privatization in Transition Countries: Institutional Features and Outcomes
Authors: Broulíková Hana M. , Montag Josef 
Published: May 2020

AbstractWe provide an overview of housing privatization policies and outcomes in transition economies. Our primary aim is to collect and systematize key information concerning the institutional features of housing privatization in individual countries: we identify the initial conditions, the timeframe of housing privatization and its culmination, the extent of housing privatization, who decided about its terms and conditions, who was entitled to privatize the housing, and at what price. Furthermore, using micro-data covering all transition countries, we present new estimates of the extent of housing privatization, its dynamics during the second half of the 2000s, and the resulting housing tenure structure.