Miracle-dz/UniFAR-FTUs huggingface dataset:
Investigation of tri-polarised MIMO technique

The performance of a tri-polarised multiple-input multiple-output (MIMO) system that employs three co-located orthogonal antennas at both ends of the communications link is investigated experimentally. Results indicate that such a system can support three independent sub-channels, resulting in a 10% outage channel capacity gain of the order of 5 bit/s/Hz over the traditional single-input single-output (SISO) system. The effect of introducing a relative angular shift between orientations of the transmit and receive antenna sets is also investigated both in azimuth and elevation. The compact size of the system should make it attractive in the design of future high-speed high-capacity communications systems including application on the handset.
Impact of fault ride‐through requirements on fixed‐speed wind turbine structural loads

The emphasis in this article is on the impact of fault ride-through requirements on wind turbines structural loads. Nowadays, this aspect is a matter of high priority as wind turbines are required more and more to act as active components in the grid, i.e. to support the grid even during grid faults. This article proposes a computer approach for the quantification of the wind turbines structural loads caused by the fault ride-through grid requirements. This approach, exemplified for the case of a 2MW active stall wind turbine, relies on the combination of knowledge from complimentary simulation tools, which have expertise in different specialized wind turbines design areas. Two complimentary simulation tools are considered i.e. the detailed power system simulation tool PowerFactory from DIgSILENT and the advanced aeroelastic computer code HAWC2, in order to assess of the dynamic response of wind turbines to grid faults. These two tools are coupled sequently in an offline approach, in order to achieve a thorough insight both into the structural as well as the electrical wind turbine response during grid faults. The impact of grid requirements on wind turbines structural loads is quantified by performing a rainflow and a statistical analysis for fatigue and ultimate structural loads, respectively. Two cases are compared i.e. one where the turbine is immediately disconnected from the grid when a grid fault occurs and one where the turbine is equipped with a fault ride-through controller and therefore it is able to remain connected to the grid during the grid fault. Copyright copy; 2010 John Wiley & Sons, Ltd.
Radio Wave Propagation Measurements and Modeling for Land Mobile Satellite Systems

The performance of a mobile satellite communications link is conditioned by the characteristics of the propagation path between a satellite and mobile users. The most important propagation effect in land mobile satellite system is roadside attenuation of the signals due to vegetation or urban structures. System designers should have the most reliable information about the statistics of the propagation channel to build reliable systems that can compensate for bad propagation conditions. simulate a propagation channel in the case of roadside tree attenuation in land mobile satellite systems. This thesis describes some improvements to PROSIM, and the adaptation and validation of PROSIM for Digital Audio Radio Satellite systems operating at S-band frequencies. The performance of the simulator for S-band frequencies was evaluated through a measurement campaign conducted with the XM Radio signals at 2.33 GHz in various propagation environments. Finally, additional results on dual satellite systems and fade correlation are described. iii Acknowledgements I would like to thank all the people who helped for finishing my thesis research. I would especially like to thank my advisor, Dr. Warren Stutzman, for his continuous supervision and his helpful suggestions. I would also like to thank the other members of my committee, Dr. Davis and Dr. Pratt for their sincere advice. In addition, I would like to thank Dr. Seong-Youp Suh for letting me use the PROSIM simulator, R. Michael Barts for sharing his ideas and correcting my work, and the members of the Virginia Tech Antenna Group who worked on the XM Radio project for their contribution to my work. Also, I would like to thank the other VTAG members for their concern about my thesis, and the general work atmosphere in the group. Finally, I would like to thank my family, and my friends in the United States and in France, for their continuous encouragement and support.
Implementing of SPIHT and Sub-band Energy Compression (SEC) Method on Two-Dimensional ECG Compression: A Novel Approach

In this paper, a novel ECG data compression method is presented which employs set partitioning in hierarchical trees algorithm (SPIHT), sub-band energy compression (SEC) method and two-dimensional electrocardiogram (2D-ECG). The 2D-ECG is a two-dimensioned array, which each row of this array indicates one or more period and amplitude normalized (PANed) ECG beats. In the previous works, SPIHT and sub-band energy compression method have used to compress one or two-dimensional signals separately and have shown their efficiencies such as precise rate control, progressive quality, high compression ratio and low root mean square difference (PRD). In here, we put these two methods together and illustrate that they can be applied to 2D-ECG to achieve better results and this is because of the wavelet transform eliminating effect on redundancies between adjacent samples - it is also eliminated in one-dimensional ECG - and between adjacent beats by applying 2D wavelet transform
The Attitudes of Egyptian Web-Based Health Information Seekers Toward Health Information Provided Through the Internet: Qualitative Study

Background The internet has become an established source of health information for many Egyptian internet users. Understanding users’ attitudes toward the benefits and limitations of web-based health information will explain the influence of this information on users’ health-related behavior and decisions. Objective This qualitative study aims to understand the attitude of Egyptian internet users toward internet health information and to explore the impact of obtained health information on users’ behavior and on their physician-patient relationship. Methods For this qualitative study, semistructured interviews were conducted with a total of 49 participants (41/49, 84% Egyptian internet users and 8/49, 16% physicians) who participated in focus groups or individual interviews. We used a thematic analysis approach to explain and demonstrate participants’ views, thoughts, and experiences in using web-based health information. Results The internet has become an important source of health information in comparison with other health information sources and is the central theme that has emerged across the thematic analysis. The attitude toward the use of internet health was classified into three main themes: feeling toward web-based health information (with subthemes: favoring, disliking, neutral, or having ambivalence feelings), motivators to seek internet health information, and behavioral changes using internet health information (subthemes: confidence, satisfaction, and improved knowledge). Themes that emerged from physicians’ interviews included the accessibility of the internet health information, good communication, and coordination of care between patients and their physicians, and the active engagement of patients with their management plan. Conclusions The internet has become an essential source of health information for Egyptian adults. Internet health information can improve the patient-physician relationship, especially when users discuss the obtained health information with their physician. Internet health information provided seekers with social support and self-confidence when making health decisions.
The Defect Identification of LED Chips Based on Bayesian Classifier

The types, causes and image properties of the defective and damaged chips are been analyzes. On the basis of analyzing the image properties, Bayesian classifier and identification method are proposed. Based on the Bayesian decision theory, five kinds of image features such as the number of light spot, dark spot, edge spot, block and area are applied. Normal distribution is made use to building classifier and studying the correction strategy of model. In the process of identification, dynamical correction and model parameters completion make the classifier have some degree of self-learning feature and higher identification accuracy. Keywords: defect; feature; classifier; decision
The specific features of low-temperature thermal properties of the heterovalent (BaF2)0.59(TmF3)0.41 solid solution

ABSTRACT The temperature dependences of the heat capacity (Cp(T)) and crystal lattice parameters (a(T) and Vu(T)) of barium difluoride, BaF2, as well as the heterovalent (BaF2)0.59(TmF3)0.41 solid solution, in the temperature range of 2–300 K are experimentally studied. Anomalous deviations of the dependences of Cp(T), a(T) and Vu(T) of the solid solution at low temperatures (2–20 K) both in the direction of higher and lower values, due to the rearrangement of the crystal field, as well as the appearance of two-level systems in the metal sublattice of the solution, are revealed. At elevated temperatures (150–300 K), an anomalous feature of the studied characteristics with a deviation towards lower values is also observed, which we attribute to the increased influence of the anharmonicity of the vibrations of the solution lattice. It is established that the occurrence of the mechanisms of the revealed anomalies may be attributed to the structural disorder of the solid solution due to the random nature of the placement of Tm3+ ions when replacing Ba2+ ions in the metal sublattice, as well as the appearance of F− ions in the interstitial spaces of the barium difluoride structure.
Coordinating Adaptation of Composite Services

We contend that the adaptation of third party services within a composition is an optimisation problem, and that coordination techniques must be used to ensure optimised composite service behaviour. Within the future-computing environment of the mobile user, one will begin to see a convergence between Internet and telecommunication networks, incorporating context information to provide the user with a personalised services environment. As is the nature of the mobile users' environment, nothing can be guaranteed to be static. The dynamic adaptation of services within this environment in response to change is therefore a major factor in the optimal delivery of services to the mobile user. The problem begins when a set of third party services are configured and composed together to deliver a service within this unpredictable environment. We demonstrate our contention through the use of a scenario. We then outline some open issues and future work.
Automation and Control of Vehicle Flow using Raspberry Pi

The number of vehicles in the world's cities increases exponentially, this is the case of Latin American cities, and particularly in the city of Portoviejo, province of Manabí in Ecuador, has been growing considerably in recent years, the city has been expanding towards its surroundings. Due to this big number of vehicles, which also adds little planning to improve the use of public transport, little planning to improve urban vehicular flow, the centralization of administrative area and main shops in the city, are the main reasons why in certain times of the day the traffic can become a little slow. Universidad Técnica de Manabí, has the objective of modernizing the improvement of vehicular flow in its surroundings and in addition to automating the vehicular entrance to its facilities through the automation of the respective permit for visiting drivers and staff. In this paper we show the methodology and tools necessary to create a system to control vehicles entry and exit using a Raspberry Pi, an analysis of the different technologies that can be used to improve vehicular flow is also included, approaching the Internet of Things.
Long-Term Pharmacological Inhibition of the Activity of All NOS Isoforms Rather Than Genetic Knock-Out of Endothelial NOS Leads to Impaired Spatial Learning and Memory in C57BL/6 Mice

Increasing epidemiological and experimental evidence points to a link between arterial stiffness and rapid cognitive decline. However, the underlying mechanism linking the two diseases is still unknown. The importance of nitric oxide synthases in both diseases is well-defined. In this study, we introduced arterial stiffness in both genetic (eNOS−/−, endothelial nitric oxide synthase knockout) and pharmacological (N(G)-nitro-L-arginine methyl ester (L-NAME) treatment) NO dysfunction models to study their association with cognitive decline. Our findings demonstrate that the non-selective inhibition of NOS activity with L-NAME induces cardiac dysfunction, arterial stiffness, and a decline in hippocampal-dependent learning and memory. This outcome demonstrates the importance of neuronal NOS (nNOS) in both cardiovascular and neurological pathophysiology and its potential contribution in the convergence between arterial stiffness and cognitive decline.
Development of an industrial e-maintenance system integrating groupware techniques

Nowadays, we see a change in the pattern of maintenance; this is due to the globalisation and the fast development of information and communication technologies. As a consequence, a modern method of maintenance, e-maintenance has emerged and has been progressively reorganising the usual maintenance system. In this context, we wish to contribute through the generation of new working group situations for experts. This paper outlines the basic design concepts of an e-maintenance system. The main objective of our approach is to provide a flexible group interaction support for remote maintenance phases, such as diagnosis, reparation and control. The system is tailored to support resource management, interaction, communication and collaboration between experts of various disciplines working simultaneously on a same failure. The emphasis is put on the aspect of the mobility of the experts for the remote maintenance achievement.
SAFETY ALERT SYSTEM USING ANDROID SMARTPHONE VIA INTERNET CONNECTIVITY

This paper describes an android smartphone application that uses the GPS system located inside the smartphone. The apps will enable the system to check for unsafety area and then turn off the online communication of the device automatically. By using Google Map that accessed through internet connectivity and then try to locate potential unsafety area before turn off the online communication for the smartphone thus disabled the usage of smartphone when entering unsafety area such as petrol stations or hazardous places. This paper concentrates only at the implementation of the system using android smartphone device and successfully creating an alert system.
Hyper chaos: Laboratory experiment and numerical confirmation

Hyperchaos has been observed, for the first time, from a real physical system: a very simple fourth-order electrical circuit. It is autonomous and reciprocal and has only one nonlinear element, a three-segment piecewise-linear resistor. Because of the circuit's simplicity, the laboratory measurements have been confirmed by digital computer simulations. The hyperchaotic nature is confirmed by the two positive Lyapunov exponents associated with the attractor, which is a fractal with a Lyapunov dimension between 3 and 4.
Insufficiency of watt-metric protection in resonant grounded networks

Implementation of resonant grounding in the medium voltage (MV) rural distribution networks is in the process of consideration in Croatia. For analytical purposes, some calculations on a proposed 'typical' rural distribution network are conducted followed by the presentation of live measurements on a similar real network. Based on calculations, influence of resonant grounding on watt-metric protection behaviour is presented in this article. This influence is compared with data found in the literature and those obtained by measurements.
Micromachined Vibratory Gyroscopes Controlled by

This work reports on the design of novel closed-loop control systems for the sense mode of a vibratory-rate gyro- scope based on a high-order sigma-delta modulator . A low-pass and two distinctive bandpass topologies are derived, and their advantages discussed. So far, most closed-loop force-feedback control systems for these sensors were based on low-pass 's. Usually, the sensing element of a vibratory gyroscope is designed with a high quality factor to increase the sensitivity and, hence, can be treated as a mechanical resonator. Furthermore, the output characteristic of vibratory rate gyroscopes is narrowband ampli- tude-modulated signal. Therefore, a bandpass is a more appropriate control strategy for a vibratory gyroscope than a low-pass . Using a high-order bandpass , the control system can adopt a much lower sampling frequency compared with a low-pass while achieving a similar noise floor for a given oversampling ratio (OSR). In addition, a control system based on a high-order bandpass is superior as it not only greatly shapes the quantization noise, but also alleviates tonal behavior, as is often seen in low-order control systems, and has good immunities to fabrication tolerances and parameter mismatch. These properties are investigated in this study at system level.
Valproic acid promotes SOD2 acetylation: a potential mechanism of valproic acid-induced oxidative stress in developing systems

Abstract Valproic acid (VPA) is an antiepileptic, bipolar, and migraine medication, which is associated with embryonic dysmorphology, more specifically neural tube defects (NTDs), if taken while pregnant. One mechanism by which VPA may cause NTDs is through oxidative stress that cause disruption of cell signaling. However, mechanisms of VPA-induced oxidative stress are not fully understood. Since VPA is a deacetylase inhibitor, we propose that VPA promotes mitochondrial superoxide dismutase-2 (SOD2) acetylation, decreasing SOD2 activity and increasing oxidant levels. Using the pluripotent embryonal carcinoma cell line, P19, VPA effects were evaluated in undifferentiated and neurodifferentiated cells. VPA treatments increased oxidant levels, oxidized the glutathione (GSH)/glutathione disulfide (GSSG) redox couple, and decreased total SOD and SOD2 activity in undifferentiated P19 cells but not in differentiated P19 cells. VPA caused a specific increase in mitochondrial oxidants in undifferentiated P19 cells, VPA did not alter respirometry measurements. Immunoblot analyses demonstrated that VPA increased acetylation of SOD2 at lysine68 (AcK68 SOD2) in undifferentiated P19 cells but not in differentiated P19 cells. Pretreatments with the Nrf2 inducer, dithiol-3-thione (D3T), in undifferentiated P19 cells prevented increased oxidant levels, GSH/GSSG redox oxidation and restored total SOD and SOD2 activity, correlating with a decrease in AcK68 SOD2 levels. In embryos, VPA decreased total SOD and SOD2 activity and increased levels of AcK68 SOD2, and D3T pretreatments prevented VPA effects, increasing total SOD and SOD2 activity and lowering levels of AcK68 SOD2. These data demonstrate a potential, contributing oxidizing mechanism by which VPA incites teratogenesis in developing systems. Moreover, these data also suggest that Nrf2 interventions may serve as a means to protect developmental signaling and inhibit VPA-induced malformations.
Mobile interface design for dynamic environments

This thesis will introduce and describe a common problem encountered while using mobile devices in dynamic environments: usability goes down drastically when a Personal Digital Agent (PDA), cell phone or mobile gaming device is used outside or in a highly dynamic environment. This is one of the problems encountered when developing a mobile application or porting an existing application to a mobile device. This Thesis has been divided into two parts, the first part will introduce the topic and discuss existing research featuring this topic. The second part will introduce a mobile software solution that was developed during the research, especially the architecture of the software will be dicussed.
Japanese knotweed increases soil erosion on riverbanks

For years, Japanese knotweed (Reynoutria japonica) has been suspected of accelerating riverbank erosion, despite a lack of convincing evidence. The stems of this invasive plant die back following the first autumn frosts, leaving the soil unprotected during winter and spring floods. In Québec (Canada), riverbank erosion may also be accentuated by ice during mechanical ice breakups. The objective of this study was to evaluate the influence of knotweed on riverbank erosion along a river invaded by the species, within a context of floods with ice. The elevation along 120 cross‐sectional riverbank profiles, occupied or not by knotweed, was measured before and after the spring flood of 2019. On average, riverbanks occupied by knotweed had nearly 3 cm more soil erosion than riverbanks without knotweed, a statistically significant difference. Stem density also influenced erosion: the higher the density, the greater the soil loss. Certain riverside conditions, such as the slope of the riverbank or being located on an islet, interacted with knotweed, further accentuating erosion. Soil losses measured between November 2018 and May–June 2019 were particularly pronounced, but the spring flood was also exceptional, with a recurrence interval close to 50 years. On the other hand, soil loss from rivers invaded by knotweed can be expected to increase over time, as this invasive species spreads rapidly in riparian habitats.
Measuring Dependence for Permutation Alignment in Convolutive Blind Source Separation

This brief proposes an effective implementation for addressing permutation ambiguity issue of convolutive blind source separation in frequency domain. Generally, signal envelope and power ratio as common inter-frequency dependence measures are utilized to group bin-wise separated signals for convolutive mixtures, where the new measure of permutation alignment method is represented by the activation matrix of bin-wise spectrum which is based on nonnegative matrix factorization (NMF). Meanwhile, canonical correlation analysis (CCA) rather than the maximum sum of correlation coefficient among different bins, is applied for verifying correlation determinations. In addition, the influence of bin distance and separation quality at each bin are explored to optimize permutation result. Simulation results demonstrate the effectiveness of the proposed technique in real recorded convolutive mixtures.
Instrument fault detection and compensation scheme for direct torque controlled induction motor drives

The effects of instrument faults in direct-torque-control-based induction motor drives are analysed and an instrument fault detection isolation scheme (IFDIS) for the drives is proposed. The IFDIS detects and isolates the incipient fault(s) of a speed sensor and current sensors in real-time. The scheme consists of an adaptive gain scheduling observer as a residual generator and a special sequential test logic unit. Although the IFDIS is a single observer scheme, it has the function of fault isolation that normally only a multiple-estimator-based IFDIS possesses. Simulation results show the detection and isolation performance of the IFDIS and the applicability of the scheme to fault tolerant control system design.