Miracle-dz/UniFAR-FTUs huggingface dataset:
Hybride Fehlerprognose zur Unterstützung prädiktiver Instandhaltungskonzepte in der Luftfahrt

Die vorliegende Arbeit beschaftigt sich mit der Analyse der Moglichkeiten und Herausforderungen zur Steigerung der operationellen Leistungsfahigkeit von Luftfahrtsystemen durch zustandsbasierte Wartungskonzepte. Hierfur wird zunachst der Einfluss von Diagnose- und Prognosefunktionen auf die Verfugbarkeit und den Wartungsaufwand des operativen Systems dargestellt. Das Hauptziel der Arbeit ist nachfolgend die Analyse und Verifikation eines neuen Konzeptes zur Fehlerprognose. Die erste Zielsetzung ist hierbei die Nachweisfuhrung, dass pradiktive Instandhaltungskonzepte die operationelle Leistungsfahigkeit von Luftfahrtsystemen steigern konnen. Hierfur wurde eine speziell fur diesen Zweck ausgelegte Simulationsumgebung aufgesetzt und validiert. Ein hierarchischer Modellierungsansatz ermoglicht eine ganzheitliche Bewertung von Auslegungskriterien hinsichtlich Genauigkeit und Prazision von Diagnose- und Prognosefunktionen. Durch die Modellierung der ersten beiden statistischen Momente ausgewahlter Modellanteile wird weiterfuhrend eine Risikoanalyse fur leistungsorientierte Vertragskonzepte ermoglicht. Motiviert durch die Ergebnisse dieser Analyse wird als Hauptziel der Arbeit ein hybrides Prognosekonzept mit daten- und modellbasierten Anteilen untersucht. Hierzu wird die „Genetische Programmierung“ (GP) als datenbasiertes Verfahren zur Systemidentifikation durch das „Unscented Kalman Filter“ (UKF) um einen modellbasierten Anteil erweitert (GP-UKF). Es wird gezeigt, dass der GP-UKF durch die Bereitstellung von geeigneten Trainingsdaten, ohne Vorwissen uber den zu prognostizierenden Prozess eine robuste und zuverlassige Fehlerprognose ermoglicht. Die Motivation hierfur resultiert aus den komplexen und kostenintensiven Masnahmen zur Neuentwicklung von Prognosefahigkeiten, die durch den hiermit verbundenen hohen Aufwand in der Entwicklungsphase und die begrenzte Qualitat der Prognose in der Nutzungsphase bisher in fliegenden Systemen nur fur einen sehr begrenzten Anwendungsbereich eine erfolgreiche Nutzung zugelassen haben. Fur die Verifikation des GP-UKF werden Modelle zur Simulation von Degradierungsverlaufen unter Berucksichtigung von messbaren und nicht messbaren Einflussgrosen aufgestellt und zusatzlich ein speziell instrumentierter Prufstand genutzt. Die Simulationsmodelle ermoglichen die Analyse eines breiten Spektrums an Anwendungsfallen zur Bewertung der Prognosefahigkeiten des GP-UKF. Fur den experimentellen Anteil der Verifikation wird das Degradierungsverhalten von Walzlagern eines luftfahrttauglichen Lufters analysiert und prognostiziert. Der Vergleich mit einem etablierten Verfahren aus dem Bereich der hybriden Fehlerprognose ermoglicht schlieslich eine objektive Bewertung des untersuchten Prognoseansatzes. Abschliesend werden die Ergebnisse der quantitativen Bewertung verwendet, um mittels der validierten Simulationsumgebung fur Potentialanalysen von Prognosefunktionen eine Analyse des operationellen Nutzens des GP-UKF-Ansatzes vorzunehmen.
Creativity in Project Work—Students' Perceptions and Barriers*

In this paper, we will present case study results from a cross-disciplinary education named Medialogy, which is taught in the Technical and Science Faculty at Aalborg University. The aim of Medialogy is to facilitate creativity within technical solutions, and thus the intention of this paper is to answer the following: What is the Medialogy students’ perception of creativity and in which part of the process of problem solving do they view themselves as being creative? In Medialogy, the education explicitly focuses on the little-c creativity and communicates the everyday life and evolutionary creativity to the students. The Medialogy students also perceive creativity as the little-c creativity that contains something interpersonal and intrapersonal, and by means of which products can be developed. They do not regard creativity as focusing on interaction and social context. They perceive that they are creative during all stages in the project work. However, it is also significant that the Medialogy students believe that they are more creative in the beginning of their projects and during the design and implementation stages, whereas the analysis is a less creative part. In general, the Medialogy students request further tools for creativity as well as more support for the creative process from the supervisors.
Hardware Development of Electrical Capacitance Tomography (ECT) System with Capacitance Sensor for Liquid Measurements

Electrical capacitance tomography system is useful for obtaining information about the spatial distribution of a mixture of dielectric materials inside a vessel. This research aims to obtain real-time monitoring on the composition for liquid mixture in conveying pipeline. ECT is a non-invasive, non-intrusive and non-destructive technique that can measure the flow level inside a pipeline. In order to increase the image resolution and accuracy of current tomography research, a study on 16 electrodes sensor ECT system has been developed. The developed system has the flexibility to be assembled and moved from a pipeline to another. The intelligent on-board flexibility and mobility sensor technique is a new technique for ECT system. The system can be assembled in different diameter sizes of pipeline, and numbers of electrodes sensor can be reduced accordingly depending on the pipeline sizes without the need to redesign the electrodes sensor. The new design is equipped with high speed data processing rate data acquisition system and high speed data reconstruction. A microcontroller that support full-speed USB data transfer rate has been designed as the centralization control unit. In order to improve data result, iterative algorithm has been implemented in this system in order to obtain a precise image of the flow in the pipeline. As a result, the ECT system is able to reconstruct various multiphase flow images.
Comparison of Breeding Values for Daily Gains of Bulls Estimated with Multi-Trait and Random Regression Models

Abstract. In this study, random regression models with Legendre polynomials of the 2nd, 3rd and 4th degree (RR2, RR3 and RR4) are compared with regard to the estimation of breeding values for the average daily gain of Czech Pied bulls (Simmental type). The data were prepared such that a multi-trait model (MTM) could be used as reference model. For each bull, 8 repeated records or fewer were available for the testing period from the 12th to the 420th day of life. For the modeling of the expected value structure, the fixed regression coefficients of the Legendre polynomials were subordinated hierarchically to the herd-year-season effects (HYS). For the comparison of the random regression models with the reference model, rank correlations between the estimated breeding values of various animal groups were calculated and a variety of top-lists were analyzed. In general, models RR3 and RR4 returned higher rank correlations with MTM in comparison to model RR2. Additionally, the number of common animals in the 1% and 10% top-lists showed that models RR3 and RR4 are to be preferred over RR2 when it comes to the estimation of breeding values.
Discrimination of some cultivars of durum wheat (Triticum durum Desf.) using image analysis

Image analysis technique is application of computer science to get a large amount of information from a digital image. This research was aimed to investigate the potential of morphological features for discrimination of five cultivars of durum wheat ( Triticum durum Desf.) including: showa, Altar 84, Altar 84-3, Dipper and Bushen. Algorithms for selecting useful morphological features were developed based on a stepwise discriminate analysis and five feature sets were used for linear discriminate analysis. The results showed that Extent and Aspect Ratio were the most and least important features in discrimination of the cultivar seeds, respectively. Discrimination using the 11 morphological features resulted in the best classification accuracy (67.66%) so that the accuracy of 58.62%, 100, 51.72%, 62.96% and 65% was obtained for Altar 84, Altar 84-3, Dipper, Bushen and showa, respectively. The results emphasized the potential of image analysis in discrimination of durum wheat cultivar seeds.
Carbon nanotubes as interconnect for next generation network on chip

Multi-core processors provide better performance when compared with their single-core equivalent. Recently, Networks-on-Chip (NoC) have been emerged as a communication methodology for multi core chips. Network-on-Chip uses packet based communication for establishing a communication path between multiple cores connected via interconnects. Clock frequency, energy consumption and chip size are largely determined by these interconnects. According to the International Technology Roadmap for Semiconductors (ITRS), in the next five years up to 80% of microprocessor power will be consumed by interconnects. In the sub 100nm scaling range, interconnect behavior limits the performance and correctness of VLSI systems. The performance of copper interconnects tend to get reduced in the sub 100nm range and hence we need to examine for other interconnect
FAST COMMUNICATION CONDITIONAL PATH SAMPLING OF SDES AND THE LANGEVIN

We introduce a stochastic PDE based approach to sampling paths of SDEs, con­ ditional on observations. The SPDEs are derived by generalising the Langevin MCMC method to infinite dimensions. Various applications are described, including sampling paths subject to two end­point conditions (bridges) and nonlinear filter/smoothers.
Feasibility of mobile laser scanning for mapping and monitoring a riverine environment

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto. fi Author Matti Tapio Vaaja Name of the doctoral dissertation Feasibility of mobile laser scanning for mapping and monitoring a riverine environment Publisher School of Engineering Unit Department of Real Estate, Planning and Geoinformatics Series Aalto University publication series DOCTORAL DISSERTATIONS 146/2014 Field of research Geoinformatics Manuscript submitted 22 April 2014 Date of the defence 24 October 2014 Permission to publish granted (date) 18 August 2014 Language English Monograph Article dissertation (summary + original articles)
Skrew Rolling of Balls in Multiple Helical Impressions

This paper presents results of theoretical and experimental research on skew rolling process of balls with diameter ∅ 30 mm in multiple helical tools. Numerical analysis of the process was conducted basing on ﬁnite element method (FEM), using the commercial software Simufact Forming in version 10.0. Simulations were made in the three-dimensional state of strain with consideration of complex thermal analysis, due to which progression of the products shape was determined. Distributions of strains and temperatures as well as the process force parameters were also determined. The results of numerical calculations were experimentally veriﬁed in laboratory conditions. The obtained results conﬁrmed the possibility of semi-ﬁnished products of balls type manufacturing by means of rolling in multiple helical impressions.
Numerical simulation of flash-boiling through sharp-edged orifices

Flash boiling is the rapid phase change of a pressurised fluid that emerges to ambient conditions below its vapour pressure. Flashing of a flowing liquid through an orifice or a nozzle can occur either inside or outside the nozzle depending on the local pressure and geometry. Vapour generation during flashing leads to interfacial interactions that eventually influence the jet. Empirical models in the literature for simulating the inter-phase heat transfer employ many simplifying assumptions, which limits their applicability. Typical models, usually derived from cavitation, fail to describe the physics of heat and mass transfer, making them unreliable for flashing. The Homogeneous Relaxation Model (HRM) is a reliable model able to capture heat transfer under these conditions accounting for the non-equilibrium vapour generation. This approach uses a relaxation term in the transport equation for the vapour. On the basis of the generic compressible flow solver within the open source computational fluid dynamics (CFD) code OpenFOAM, the HRM has been implemented to create a dedicated new solver HRMSonicELSAFoam. An algorithm that links the standard pressure–velocity coupling algorithm to the HRM is used. In this method, a pressure equation is derived which employs the continuity equation including compressibility effects. A relaxation term has been defined such that the instantaneous quality would relax to the equilibrium value over a given timescale. Although it is possible to consider this timescale constant, it is calculated via an empirical correlation in the present study. Validations have been carried out by simulating two-phase flows through sharp-edged orifices. The relatively good agreement achieved has demonstrated that the solver accurately calculates the pressure and vapour mass fraction. This demonstrates the potential of HRMSonicELSAFoam for flash boiling simulations and predicting the properties of the subsequent flash atomisation.
Comparison of Anthropometric Indices of 10-16 Years Old School Girls with the NCHS International Standard

Introduction: One of the most important international indicators for assessing growth and physical health is measuring weight, height, BMI and other parameters of growth and development and comparing it with standard curves. Accordingly, the purpose of this study was to compare anthropometric indices of 1016 years old school girls with the NCHS iternational standard. Methods: In this descriptive cross-sectional study, 267 female students aged 10 to 16 year-old in Taft city were randomly selected through cluster sampling and the mean and standard deviation of their anthropometric indices in their age ranges with related methods were measured and compared to the National Center for Health Statistics (NCHS) standard. Finally, the data were analyzed using both descriptive and inferential statistics including KolmogrovSmirnov and single sample t-test at a significance level of less than 0.05. Results: The results showed that weight, triceps skinfold thickness, subscapular skinfold thickness of students in all age ranges were significantly lower than NCHS standard (p ≤0.05). But the height, body mass index, mid arm circumference, waist circumference, upper leg length and upper arm length of students in some age groups were significantly lower than the NCHS standard (P ≤0.05), and in other age groups, there was no significant difference (P≥ 0.05). Conclusion: The results of this study showed that the anthropometric characteristics of these students are less than international standards. Significant changes made in some of these anthropometric indices can be due to the geographical, climatic, nutritional and physical activity of students, which should be given more attention.
Tatouage pour le renforcement de la qualité audio des systèmes de communication bas débit

L'objectif de cette these est d'etudier l'idee du tatouage dans le traitement du son.Les recherches en tatouage audio se sont principalement tournees vers des applications securitaires ou de transmission de donnees auxiliaires. Une des applications visees par ce concept consiste a ameliorer la qualite du signal hote ayant subi des transformations et ceci en exploitant l'information qu'il vehicule. Le tatouage audio est donc considere comme memoire porteuse d'informations sur le signal originel. La compression a bas debit des signaux audio est une des applications visee par ce concept. Dans ce cadre, deux objectifs sont proposes : la reduction du pre-echo et de l'amollissement d'attaque, deux phenomenes introduits par les codeurs audio perceptifs, en particulier les codeurs AAC et MP3; la preservation de l'harmonicite des signaux audio degradee par les codeurs perceptifs a extension de bande, en particulier le codeur HE-AAC.La premiere partie de ce manuscrit presente les principes de base des systemes de codage bas debit et etudie les differentes distorsions introduites par ces derniers. Fondees sur cette etude, deux solutions sont proposees. La premiere, visant principalement la reduction du pre-echo, consiste a corriger l'enveloppe temporelle du signal apres reception en exploitant la connaissance a priori de l'enveloppe temporelle du signal original, supposee transmise par un canal auxiliaire a faible debit (< 500 bits/s). La seconde solution vise a corriger les ruptures d'harmonicite generees par les codeurs a extension de bande. Ce phenomene touche essentiellement les signaux fortement harmoniques (exemple : violon) et est percu comme une dissonance. Une preservation de l'harmonicite des signaux audio par des operations de translation spectrale est alors proposee, les parametres etant la encore transmis par un canal auxiliaire a faible debit.La seconde partie de ce document est consacree a l'integration du tatouage audio dans les techniques de renforcement de la qualite des signaux audio precitees. Dans ce contexte, le tatouage audio remplace le canal auxiliaire precedent et œuvre comme une memoire du signal originel, porteuse d'informations necessaires pour la correction d'harmonicite et la reduction de pre-echo. Cette seconde partie a ete precedee par une etape approfondie de l'evaluation des performances de la technique de tatouage adoptee en terme de robustesse a la compression MPEG (MP3, AAC et aacPlus).
How Do Experienced Traders Respond to Inflows of Inexperienced Traders? An Experimental Analysis

We conducted asset market experiments where one experienced subject (EH) interacts with five inexperienced subjects (1EH5H) to investigate how EHs change their price forecasts and trading strategies when faced with strategic uncertainty caused by inflows of inexperienced subjects. Only half the EHs initially forecasted prices deviating more from the fundamental values in 1EH5H than in the final round of the experiment in which they had previously participated. Furthermore, the majority of our EHs did not change their trading behaviour. Many EHs act as price stabilisers when the inflow of inexperienced subjects is not associated with other changes in market conditions.
Glaciological characteristics in the Dome Fuji region and new assessment for 1.5 Ma old ice

Abstract. A key objective in palaeo-climatology is the retrieval of a continuous Antarctic ice-core record dating back 1.5 Ma. The identification of a suitable Antarctic site requires sufficient knowledge of the subglacial landscape beneath the Antarctic Ice Sheet. Here, we present new ice thickness information from the Dome Fuji region, East Antarctica, based on airborne radar surveys conducted during the 2014/15 and 2016/17 southern summers. Compared to previous maps of the region, the new dataset shows a more complex landscape with networks of valleys and mountain plateaus. We use the new dataset as input in a thermokinematic model that incorporates uncertainties in geothermal heat flux values in order to improve the predictions of potential ice-core sites. Our results for obtaining an old ice core show that especially the region immediately south of Dome Fuji station persists as a good candidate site. An initial assessment of basal conditions revealed the existence several wet-based areas. Further radar data analysis shows overall high continuity of layer stratigraphy in the region. This indicates that extending the age-depth information from the Dome Fuji ice core to a new ice-core drill site is a viable option.
Direct interaction between wild fish aggregations at fish farms and fisheries activity at fishing grounds: a case study with Boops boops

Coastal aquaculture installations concentrate large numbers of wild ¢sh species of both ecological and economic importance, including schools of bogue, Boops boops (L.), in high abundance and biomass. The aggregated species consume large quantities of the easily available pellets lost from cages. As a consequence, the physical condition of farm-associated wild ¢sh is increased and their physiology is altered. These changes may in£uence local ¢sheries as many of these aggregating species are targeted by ¢shers. We assess whether local ¢shers catch wild ¢sh that have previously aggregated at ¢sh farms by comparing the body condition, trophic indexes, diet overlap and the fatty acid (FA) composition of B. boops obtained from local ¢sh markets and around ¢sh farms. Bogue captured by trammel-nets and around ¢sh farms facilities presented a similar biological condition, as well as high quantities of pellets in the gut, and their FA pro¢le was aiected by vegetalderived FAs. In contrast, bogue captured by trawlers were not in£uenced by ¢sh farms, as they consumed natural trophic resources.We conclude that artisanal ¢shers exploit these aggregated ¢sh populations once they have dispersed away from farms, and bene¢t from a ‘biomass export’ from ¢sh farms at a local scale.
Proton-Electrostatics Hypothesis for Localized Proton Coupling Bioenergetics

According to the proton-electrostatics localization hypothesis presented in this work, protons injected into a thylakoid may be electrostatically localized at the water-membrane interface along the lumenal surface. This hypothesis provides a natural frame work to explain a wide range of experimental observations in the bioenergetics of chloroplast and other biological systems conducted since the 1960s, including the longstanding well-characterized energetic problems of alkalophilic bacteria such as Bacillus firmus. It can also help reconcile the elegant scientific observations of both the Dilley experiment and the Junge neutral-red thylakoid proton detection. Our analysis indicates that the Mitchellian view of delocalized proton coupling to ATP synthase could only be true under special circumstances; namely, when the membrane electrical potential difference is near zero and the bulk phase-to-bulk phase pH difference becomes the dominant factor. The proton coupling under most physiological conditions of photosynthesis is likely to occur in a mixed state of proton electrostatic localization of excess charge at the membrane surface and delocalization in the bulk media. The proton-electrostatics localization hypothesis leads to a new bioenergetics equation for the proton motive force which may provide a unified framework for understanding the energetics of many biological systems.