Miracle-dz/UniFAR-FTUs huggingface dataset:
Crafting magnetic skyrmions at room temperature : size, stability and dynamics in multilayers

Magnetic skyrmions are nanoscale two-dimensional windings in the spin configuration of some magnetic materials subject to the Dzyaloshinskii-Moriya antisymmetric exchange interaction. They feature a non-trivial topology and show promise to be the smallest achievable magnetic textures. Very recently, magnetic skyrmions have been successfully stabilised up to room temperature by leveraging on the design of magnetic multilayer systems breaking the vertical inversion symmetry. Following up on this achievement, the main objective of this thesis is the understanding and the control of the various physical properties of skyrmions hosted by such multilayer systems. As a first approach to this objective, an original model allowing to predict the profiles adopted by multilayer skyrmions is described and then employed. This numerical model is very generic, as it exploits only the cylindrical symmetry of multilayer skyrmions, in order to determine the magnetostatic interactions with less effort. This model is further extended in order to approximate the thermal stability of multilayer skyrmions, which is key to their experimental realisation. The next aspect of this thesis consists in the experimental study of the electrical manipulation of multilayer skyrmions, demonstrating three main functionalities that are nucleation by local currents, displacement under spin currents and individual detection by transverse voltage. The third aspect of my thesis is the study of the physical properties influencing the current-induced motion of skyrmions in magnetic multilayers. A pinning behaviour is evidenced experimentally and analysed relying on micromagnetic modelling. One of the important results of this work is also the prediction of hybrid chirality for some multilayer magnetic configurations, which is then demonstrated experimentally using a synchrotron technique. The impact of hybrid chirality on current-induced skyrmion motion is discussed and leads to the optimisation of the multilayer design, resulting in the experimental observation of motion for skyrmions below 50 nm in radius at velocities reaching around 40 m/s. The last part of this thesis aims at leveraging on these theoretical and experimental advances in order to reduce the size of skyrmions at room temperature. After the analysis of the impact of dipolar interactions on skyrmion stability, the engineering of the materials and of the layers periodicity is attempted. I also investigate experimentally the conception of magnetic textures with compensated magnetization in multilayer structures known as synthetic antiferromagnets, and show that they can host antiferromagnetic skyrmions at room temperature. This last result opens up new prospects for achieving room-temperature skyrmions combining size in the single-digit nm range and high mobility, potentially allowing applications towards energy-efficient computation and storage devices with a very dense integration.
Experimental identification of robot and load dynamic parameters

Presents an experimental identification of dynamic parameters of a non-direct drive robot and its load, which appear in the integral model, based on the energy theorem formulation. In the robotics literature, there are no experimental results known to the authors concerning the identification of the integral model parameters. In order to satisfy this, an experimental set-up has been built around an industrial ASEA IRp-6 robot. Next the robot dynamic integral model, taking into account friction parameters (viscous and Coulomb), as well as the load dynamic model have been formulated. The experimental results have been presented, including comparison of the results for both integral and differential identification. <<ETX>>
Relationship between sportscape and behavioral intention of spectator

SPECTATOR: CASE OF FOUR PROFESSIONAL MAJOR LEAGUE SPORT EVENTS By WOO YOUNG JANG (Under the Direction of Kevin K. Byon) ABSTRACT Effects of the sportscape on spectators’ revisit intention at four different types of professional sports leagues; major league baseball, national football league, national basketball league, and national hockey league were examined. The purpose of this study was to identify differences between spectators at different types of professional sport events. Data were collected by online survey from 481 persons who attended professional sport events by online survey. In order to examine the data, confirmatory factor analysis and regression analysis were used. A regression analysis was employed to test relationship between the independent variables and dependent variables. The result indicated that NBA and MLB spectators tend to considered that aesthetic of sport venue significantly effects on their revisit intention. In the case of NFL sport event participants, layout accessibility was the most important for their intention of next participation. In the case of NHL sport events participants, the most number of sportscape factors influence spectators' revisit intention.
Kajian Tingkat Akurasi Sensor pada Rancang Bangun Alat Ukur Total Dissolved Solids (TDS) dan Tingkat Kekeruhan Air

Total Dissolved Solids (TDS) and turbidity of water are parameters to determine the quality of water. In this research, instruments development and study of accuracy level for TDS meter and turbidimeter have been made. Instruments were made using TDS sensor and turbidity sensor that were inexpensive and available on the market. The samples used for instruments examination were water with dye (Rhodamine B) and powder of coffee as impurities. The results showed that the sensors worked properly and provided a better accuracy in measuring water samples with coffee impurities than dye impurities. The inaccuracy on the determination of water samples with dye impurities due to dye particles which have soluble properties on water and microscopic size than particles of coffee.
MULTISCALE MODELING OF SHORT FIBRE REINFORCED COMPOSITES AND IT’S RELATIONSHIP TO MODAL ANALYSIS OF MACHINERY PARTS

Although molding of thermoplastics is very productive method of machinery manufacturing, pure plastics are almost not used in so much quantity. Particle reinforced composites are more popular, because presence of solid inclusions reduces volume of organic matrix and usually improve strength and stiffness. Final properties are strongly influenced by manufacturing process which affects inner material structure. In composites where fibers are continuous in one direction or placed in layers, i.e. the fibers do not end inside the composite and it`s length is close to the dimension of machinery parts, elastic [1] [2] and thermal properties [7] can be predicted quite easily by Halpin-Tsai equations or derived simplified methods [2] with high accuracy. This paper is focused on prediction of density and material stiffness of composites, which are reinforced with very short glass fibers in thermoplastic matrix. In the first part we define the field of problem. Then we present simplified analytical calculus in compare to finite element method. We focus on ABAQUS 2018 and its features, which can be used for solving those problems. Estimation approaches such as representative volume element method and mean field homogenization are also studied. After this presented methods are confronted with selected material datasheet of Ultramid® A3WG6 [9] and Zytel® 70G35HSLRA4 [12] composite material. The effect of fiber randomization on material stiffness is introduced [4]. At the end of thesis we use previously calculated material data for modal analysis of real parts which are made from molded thermoplastic with short glass as well.
Social Exclusion of People Who Suffer from Mental Disorders: A Proposal for an Explanatory Model

Abstract Beliefs about the nature of social groups may motivate people to exclude members of minority groups from their conviviality. This process is analyzed in this article by proposing an explanatory model for the social exclusion of people suffering from mental disorders wherein beliefs about the nature of mental disorder, the perception of threat and prejudice contribute to social exclusion. Two studies (Study 1, N = 254; Study 2, N = 236) were conducted with university students who answered the following questions about beliefs and prejudices regarding mental disorders, perceived threat and social exclusion. Regression analyses have shown that exclusion is motivated by prejudice, whose impact is mediated by perceived threat. The results also indicated that prejudice is anchored in participants’ beliefs on the nature of mental disorders, especially those with a religious basis.
Classification of native heart valve sounds using the Choi-Williams time-frequency distribution

Describes the novel application of time-frequency (T-F) distributions to the assessment of heart valve condition. The Choi-Williams distribution (CWD) was applied to a set of 45 normal/abnormal valve subjects and 9 descriptive features were extracted from the resulting T-F plots. A definition of normality, for each of the 9 features, was produced and assessing the performance of the 45 data subjects with respect to these criteria resulted in correct classification of 44 of the 45 subjects. This work empirically demonstrates the suitability of T-F techniques as an aid to the assessment of cardiac condition and clearly shows the advantages of T-F over classical spectral estimation techniques.
Fault Tolerant Control of a Civil Aircraft Using a Sliding Mode Based Scheme

This paper presents a sliding mode control scheme for reconfigurable control of a civil aircraft. The controller is based around a state-feedback sliding mode scheme where the nonlinear unit vector term is allowed to adaptively increase when the onset of a fault is detected. Compared to other fault tolerant controllers which have been implemented on this model, the controller proposed here is relatively simple and yet is shown to work across the entire `up and away' fight envelope. Unexpected deviation of the switching variables from their nominal condition triggers the adaptation mechanism.
Preparing beginning teachers for technology integration in education: ready for take-off?

The overall aims of this study are to explore (1) how beginning teachers integrate technology in their practice and (2) the connections between teachers’ technology uses and their pre-service education programmes. Data of this follow-up study were collected through in-depth interviews with beginning teachers. The results reveal that all beginning teachers used a wide range of technological applications, mainly for structured learning approaches, while few created opportunities for student-centred technology use. Further, pre-service learning experiences that impact graduate teachers’ technology use are identified. While teacher educators modelling technology use are an important motivator for beginning teachers to use technology in their own teaching, field experiences seem to be the most critical factor influencing their current practice. Based on the results of this study, recommendations about how to prepare and support pre-service and beginning teachers for technology integration are discussed.
Influence of Perceived Socially Responsible Human Resource Management on Task Performance and Social Performance

While previous research has already revealed the positive influence of socially responsible human resource management (SRHRM) on organizations, little is known about whether employees’ perceived SRHRM can lead to a win–win situation between organization and society. We address this void by examining whether employees’ perceived SRHRM can contribute to organizational performance (operationalized as task performance and organizational citizenship behavior, OCB), and social performance (operationalized as volunteering). Using a sample of 314 employee–supervisor dyads from three large manufacturing enterprises in Southeast China, we found that perceived SRHRM could increase employees’ OCB and volunteering, but not task performance, through both cognitive (i.e., prosocial identity) and affective (i.e., affective empathy) paths. Furthermore, perceived SRHRM was more positively related to prosocial identity and affective empathy when distributive justice was high. We finally discuss the implications of our findings for both theory and practice.
The Meanings Soldiers Attach to Health and Their Impacts on Primary Health-Care Utilization and Avoidance in an Australian High-Risk Combat Unit

It is widely accepted many health and mental health conditions experienced by veterans may be prevented or reduced in severity through early primary health-care intervention, yet research suggests high levels of health-care avoidance in this population. The aim of this study was to examine the meanings military personnel attached to health and how these impacted health-care utilization. To achieve this, 50 hours of primary interview data were obtained from 13 Australian Army combat personnel undergoing rehabilitation, which were thematically analyzed. Results support previous findings that engagement with health-care services was perceived to negatively impact career and deployment opportunities; however, these issues were marginal to perceptions of losing personal agency when engaging with the health-care system for physical and psychological concerns, which resulted in mistrust of it. We argue issues of mistrust underscore health-care avoidance in the military and recommend primary health-care principles be incorporated into to garrison health services.
Children's digital text comprehension

The present study examined children’s digital text comprehension of various digital text types: linear digital text, digital text with navigable graphical overview, digital text with embedded hyperlinks (hypertext) and hypertext with navigable graphical overview. We investigated to what extent individual variation in children’s comprehension could be explained by lexical quality (word decoding & vocabulary), cognitive load factors (i.e., prior knowledge & working memory), text types, and graphical overview. Participants were 93 6th-graders in a within-subjects design. In line with the lexical quality hypothesis, decoding skills and vocabulary were strong predictors of children’s digital comprehension scores. The various digital text types did not account for variance in children’s digital comprehension. It is concluded that digital texts with basic digital text features and comprehension questions during reading are suitable for primary school children, pending a sufficient level of lexical quality.
Influence of Tensile Stress on Woven Compression Bandage Structure and Porosity

Abstract Woven compression bandage (CB) is one of the elastic textiles that exert pressure on muscles. With a defined tensile strength, it is possible to create the required compression on the given body parts. This work aims to investigate the relationship between woven fabric deformation, porosity, and tensile stress properties of three main types of woven CBs. All bandage samples are applied on human leg using two- and three-layer bandaging techniques. Bandage porosity is calculated for all frames at different weave angles using NIS software. Woven bandage construction parameters which are given by the preparation of warp and weft yarns, twist, count, and density along with woven fabric weave, type of weaving, and finishing process are the main factors that influence the bandage properties. Several methods considering thread distributions have been developed to determine the woven fabric's porosity during the tensile stress. Experimental results confirm that bandage porosity is directly proportional to the bandage extension and weave angle that ranges from 44° to 90°. The novelty of candidate study is to introduce practical remarks to the patient for optimizing the required bandage pressure by suitable extension or applied tension or weave angle for two- and three-layer bandaging systems.
CA MARKOV MODELING OF LAND USE LAND COVER DYNAMICS AND SENSITIVITY ANALYSIS TO IDENTIFY SENSITIVE PARAMETER(S)

Abstract. An attempt has been made to explore, evaluate and identify the sensitive parameter(s) of Cellular Automata Markov chain modeling to monitor and predict the future land use land cover pattern scenario in a part of Brahmaputra River Basin, India. For this purpose, land use land cover maps derived from satellite images of Landsat MSS image of 1987 and Landsat TM image of 1997 were used to predict future land use land cover of 2007 using Cellular Automata Markov model. Sensitivity analysis has been carried out to identify the land use land cover parameter(s), which have the highest, lowest or intermediate influence on predicted results. The validity of the Cellular Automata Markov process for projecting future land use and cover changes in the study area calculates various Kappa Indices of Agreement (Kstandard) which indicate how well the comparison map agrees and disagrees with the reference map (land use land cover map derived from IRS-P6 LISS III image of 2007). The results shows that the land with or without scrub appeared to be most sensitive parameter as it has highest influences on predicted results of land use land cover of 2007. The second most sensitive parameter was lakes / reservoirs / ponds to predict land use land cover of 2007, followed by river, agricultural crop land, plantation, open land, marshy / swampy, sandy area, aquatic vegetation, built up land, dense forest, degraded forest, waterlogged area and agricultural fallow land. The least sensitive parameter is agricultural fallow land, which has minimum influence on predicted results of land use land cover of 2007. The validation of CA Markov land use land cover prediction results shows Kstandard is 0.7928.
Incidence of Egyptian Live Births of Cleft Lip and/or Palate in Cairo, Luxor, Aswan and New Valley Governorates: A Survey Study in 237,783 Children

Objective: To evaluate the prevalence, cleft types distribution and etiological risk factors among newly born babies with cleft lip and/or palate (CL±P) in four governorate of the Arab Republic of Egypt, beginning the 1st of January 2013 till the 31st of December 2013. Material and Methods: Total 237,783 newly born babies from Cairo (162174), Aswan (42880), Luxor (32729), and New Valley (877) governorate in the Arab Republic of Egypt were included in this study. Incidence of CL±P babies per 1000 births was calculated in each district for the four studied governorates. Percentage distribution of cleft types within each governorate. Chi-square test was used for determining significance of difference of incidence and percentages within and between the governorates. Results: The mean prevalence value of CL±P in the four Egyptian studied governorates was 0.40/1000. The highest percentage of cleft type was cleft lip and palate followed by cleft lip and isolated cleft palate. The highest etiological risk factor was maternal passive smoking in the four studied governorates followed by consanguineous marriage and medicine intake during pregnancy. Conclusion: These data provided a picture of the prevalence of CL±P in four different governorate of Egypt and also provided a useful reference for cleft types distribution and etiological risk factors of CL±P data in Egypt and internationally.
ANALYSIS OF SPELLING PERFORMANCE IN ENGLISH AMONG STUDENTS WHOSE FIRST LANGUAGE IS ARABIC

One of the main differences between English monolinguals and English language learners is that the latter use their knowledge of their first language in spelling in English. Previous studies have shown that the nature of first language affects spelling in English. One of the factors which influence spelling in English is the phonology of first language. The main aim of this study was to examine the spelling performance in English among students whose first language was Arabic in two novel phonemes (/p/ and /v/) and their phoneme pairs (/f/ and /v/). The analyses were based on a dictation task. There were eight target words for each phoneme. Each word had a target phoneme embedded in the initial or the final position. There were 99 Arabic speaking participants from fourth grade whose performance was compared with 40 monolingual English speaking participants. Findings of the present study indicated that the Arabic participants had particular difficulty in spelling the novel phonemes /p/ and /v/ with large effect size. The participants mostly confused these two phonemes with their phoneme pairs and spelled /p/ as b and /v/ as f. The Arabic participants also had some difficulty in spelling the phoneme pairs /p/ and /v/, and spelled /b/ as p and /f/ and v. This finding had a medium effect size. Finally, both groups of participants generally performed better when the target phoneme was in the initial position. The present study is a contribution to the current literature about the effect of first language on spelling in English. In order to establish a universal theory about how language learners acquire the English spelling and to compare and contrast the acquisition of spelling of native speakers of English and English language learners, it is fundamental to examine the world's various languages and their effect on second language spelling acquisition. Additionally, the findings of this study can provide practical implications for language literacy classes which are designed for Arabic students.
Flow pattern transitions in oil-water flows past a bluff body

In this Thesis a novel approach is followed to facilitate the experimental investigations on the flow pattern transitions from separated to dispersed flows using a cylindrical bluff body in horizontal oil-water flows. A transverse cylindrical rod is used as a bluff body which is placed under the interface of the two immiscible liquids and near the test section inlet to passively generate interfacial perturbations and breaking waves. This approach was inspired from the use of hydrofoils in ships that reduce frictional drag via increased air entrainment. Studies are carried out using two flow facilities and high speed imaging combined with laser based measurements are performed at two axial locations along the test section, immediately after the cylinder and at large distance away from the cylinder. The effect of a confined geometry on the characteristics of the von Karman vortices and on the general flow behaviour immediately downstream of the cylinder are investigated in single phase water flows. It is found that the 3D pipe geometry does not affect significantly the vortex shedding behind the cylinder at least in the central plane of the pipe. The frequencies of the vortex shedding were comparable to those from a cylinder in an unconfined liquid. The results from two phase flows reveal that the cylinder reduces the mixture velocity for the transition separated to dispersed flows. It also actuates interfacial waves that are found to be non-linear and convective. In many cases the waves have the same frequencies as the von Karman vortices depending on the submergence depth of the cylinder underneath the oil-water interface and on the Froude number of the water layer. The observations suggest that strongly non-linear waves are responsible for forming thin ligaments that eventually break up into droplets.