Miracle-dz/UniFAR-FTUs huggingface dataset:
The modelling of switched reluctance machines with magnetically coupled windings

This paper presents a method of modelling switched reluctance motors with strongly coupled windings, such as SRMs with fully pitched windings or with commutating windings. These machines are particularly difficult to model because, unlike a conventional SRM, the flux linking any one winding of the machine is a nonlinear function of rotor position and all phase currents. The problem is overcome by breaking down the instantaneous flux-linkages and currents in each phase to give the flux and MMF in each tooth of the machine. The flux and MMF per tooth can then be linked in the model by a simple look-up table, determined from either simulation or measurement. The paper describes the simulation method in detail and then gives extensive comparisons between measurement and simulation results for an SRM with fully pitched windings, operating over a range of operating conditions. The results presented also serve to give an insight into the method of operation of these rather complex machines.
Enhanced controller for a four-leg inverter operating in a stand-alone microgrid with unbalanced loads

Stand-alone low voltage (LV) microgrids supplying small local loads far from the utility grid are becoming an increasingly popular alternative to a total reliance on the centralized utility grid. In most of LV microgrids, three-phase four-wire distribution systems are used to supply both single- and three-phase loads. Unequal distribution of loads can result in voltage unbalance problems. The use of the four-leg inverter is one of the best solutions for providing a neutral current path and compensating unbalanced load conditions in stand-alone LV microgrids. This paper proposes a fast control technique to compensate unbalanced voltage conditions for a four-leg inverter operating in a stand-alone LV microgrid. The suggested technique provides the current controller’s orthogonal component without introducing any additional dynamics or distortions. The major benefits of the recommended per-phase control technique over conventional orthogonal signal generation (OSG) methods are enhanced steady-state and dynamic performances as well as independency to the system parameters. Several simulation results are provided to confirm the superior performance of the suggested methods.
Dynamic modeling of universal motors

A general time-stepping approach is presented to solve coupled field-circuit-motion problems for universal motors. Circuit equations are used to describe the dynamic connections of field and armature coils, to include the end leakage inductance and the voltage drop across brushes, and to support a voltage source with arbitrary waveforms. In addition, the effects of the coils undergoing commutation have been considered by having them removed temporarily from the main winding and excited by a controlled current source.
Basic study on inset position of stack in the system with branch tubes for applying thermoacoustic silencer to multi cylinder engine muffler

We have proposed an automobile muffler that uses the thermoacoustic effect. Application of the thermoacoustic effect to a silencer was investigated experimentally in previous studies. Results confirmed that the sound pressure after passing through the stack with a temperature gradient was less than that without a temperature gradient. From these experiment results, a silencer based on the thermoacoustic effect was developed. This study specifically examined the stack installation position. The muffler of a multi-cylinder engine has branch tubes. We investigated the influence of the stack installation position of the branch tube. A branch tube has a confluence. A stack was installed on the front and back of the confluence. When the stack was installed on the front and back of the confluence, a silencing effect was confirmed. When the stack was installed on the back of the confluence, the silencing effect was effective.
X SIMPÓSIO DE ESPECIALISTAS EM PLANEJAMENTO DA OPERAÇÃO E EXPANSÃO ELÉTRICA X SYMPOSIUM OF SPECIALISTS IN ELECTRIC OPERATIONAL AND EXPANSION PLANNING SIGNIFICANCE OF LOAD MODELLING IN POWER SYSTEM DYNAMICS

SUMMARY Load modelling is a perennial source of consternation. Postmortem analyses of disturbances frequently conclude that load models must be adjusted to achieve an adequate match between measured and simulated behaviour. However the development of load models that are accurate over a wide range of system conditions requires, 1) testing that is undesirable for customers, and/or 2) measurement of behaviour during infrequent disturbances. Furthermore, the stochastic nature of many loads implies load models that are accurate at one time may be inaccurate a short time later. In terms of quantitative analysis, for example matching simulations with measurements, it is absolutely clear that accurate load modelling is vitally important. But for qualitative investigations, where the aim is to assess the likelihood of a certain disturbance scenario remaining stable or causing instability, then the need for accurate load modelling is much reduced. The paper explores this conjecture through the use of trajectory sensitivity concepts. It is shown that for qualitative assessment, it is more important to know the sensitivity of behaviour to load parameters, than to precisely know the parameter values. However most power system failures are not initiated by instability, but rather by reactionary (unanticipated) protection operation. The ability to predict operation of protection devices, and hence potential protection-induced cascading failures, may be greatly affected by load model fidelity.
A Systematic Literature Review on 30 Years of Empirical Research on Information Systems Business Value

Information Systems Business Value (ISBV) has been a key research topic for the IS research community. While the vast majority of ISBV research demonstrates the positive relationship between IS and firm performance, the fundamental question of the causal relationships between IS and business value remains partly unexplained. Moreover, researchers do not share a unified understanding of ISBV concepts. Therefore, this research intends to synthesize the past 30 years of empirical ISBV research, identify the gaps and shortcomings, conceptualize the ISBV concepts, and propose possibilities for further research that will widen the current narrowly shared ISBV bottom line. We aim to synthesize (1) different operationalization of concepts in existing ISBV research; (2) IS determinants, consequences, and the relations among the variables; (3) the role of contextual factors; and (4) the adopted theoretical views.
Sistem Lelang Tender dan Dealing Online Berbasis Web (Studi Kasus pada PT. X)

Currently, information technology is an inseparable unity with the continuity of interaction in a company. Tender auction process in PT. X that still run manually requires an application that can help treat, manage and organize the data and the tender auction process online using a reliable technology. They also need the system that can relieve the bidder, in this case are the contractor who follow this tender auction process. Based on this analysis, the authors make an online web based system using email technology in the communication process performed between the tender committee and the contractor also with database technology to assist the system in the store, process and manage all data input by the user. And provide output report relating to the tender bidding process organized by PT.X. Keywords: Auction tender, email, databases, reports, web-based
A Novel Multi-Modality Image Simultaneous Denoising and Fusion Method Based on Sparse Representation

Multi-modality image fusion applied to improve image quality has drawn great attention from researchers in recent years. However, noise is actually generated in images captured by different types of imaging sensors, which can seriously affect the performance of multi-modality image fusion. As the fundamental method of noisy image fusion, source images are denoised first, and then the denoised images are fused. However, image denoising can decrease the sharpness of source images to affect the fusion performance. Additionally, denoising and fusion are processed in separate processing modes, which causes an increase in computation cost. To fuse noisy multi-modality image pairs accurately and efficiently, a multi-modality image simultaneous fusion and denoising method is proposed. In the proposed method, noisy source images are decomposed into cartoon and texture components. Cartoon-texture decomposition not only decomposes source images into detail and structure components for different image fusion schemes, but also isolates image noise from texture components. A Gaussian scale mixture (GSM) based sparse representation model is presented for the denoising and fusion of texture components. A spatial domain fusion rule is applied to cartoon components. The comparative experimental results confirm the proposed simultaneous image denoising and fusion method is superior to the state-of-the-art methods in terms of visual and quantitative evaluations.
Vitamin D: Bolus Is Bogus—A Narrative Review

In this review we summarize the impact of bolus versus daily dosing of vitamin D on 25(OH)D and 1,25(OH)2D levels, as well as on key countervailing factors that block vitamin D functions at the cellular level. Further, we discuss the role of bolus versus daily dosing of vitamin D for several health outcomes, including respiratory infections and coronavirus disease 2019 (COVID‐19), rickets, falls and fractures, any cancer, and cancer‐related mortality. This discussion appears timely because bolus doses continue to be tested for various disease outcomes despite a growing amount of evidence suggesting lack of efficacy or even detrimental effects of bolus dosing of vitamin D for outcomes where daily dosing at modest levels was effective in the vitamin D deficient. As a result, these discordant results may bias health recommendations for vitamin D if the recommendations are based on meta‐analyses combining both daily and bolus dosing trials. © 2021 The Authors. JBMR Plus published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research.
Social networking habits among students

The Internet and, in particular, social network sites (SNS) have revolutionised communication patterns in the 21st century. Globally, adoption of these technologies is most common among young consumers, who increasingly integrate social networking into their daily lives. This study examines SNS usage habits of students. Data were collected using a self-administered questionnaire from a sample of 256 South African students. Findings confirm the popularity of Facebook, and suggest potential for social networking in many aspects of students’ lives including education. Faster Internet access and cheaper 3G technology, as well as Smartphone telephony, are enablers that influence adoption of social networking positively. The paper concludes by proposing implications and suggesting areas for future research. Key words: Facebook, social network sites, Internet, social network sites (SNS), students, young consumers, South Africa.
Coseismic and Early Postseismic Deformation Due to the 2021 M7.4 Maduo (China) Earthquake

The 2021 Maduo earthquake ruptured a 150 km‐long left‐lateral fault in the northeast Tibet. We used Synthetic Aperture Radar data collected by the Sentinel‐1A/B satellites within days of the earthquake to derive a finite fault model and investigate the details of slip distribution with depth. We generated coseismic interferograms and pixel offsets from different look directions corresponding to the ascending and descending satellite orbits. At the eastern end the rupture bifurcated into two sub‐parallel strands, with larger slip on the northern strand. Inversions of coseismic displacements show maximum slip to the east of the epicenter. The averaged coseismic slip has a peak at depth of 3–4 km, similar to slip distributions of a number of shallow strike‐slip earthquakes. Postseismic observations over several weeks following the Maduo earthquake reveal surface slip with amplitude up to 0.1 m that at least partially eliminated the coseismic slip deficit in the uppermost crust.
Forward search algorithm based on dynamic programming for real-time adaptive traffic signal control

The scheduling of traffic signal at intersections is involved in an application of artificial intelligence system. This study presents a new forward search algorithm based on dynamic programming (FSDP) under a decision tree, and explores an efficient solution for real-time adaptive traffic signal control policy. Traffic signal control with cases of fixed phase sequence and variable phase sequence are both considered in the algorithm. Owing to the properties of forward research dynamic programming and the process optimisation of repeated or invalid traffic states the authors proposed, FSDP algorithm reduces the number of states and saves much computation time. Consequently, FSDP is certain to be an on-line algorithm through its application to a complicated traffic control problem. Moreover, the labelled position method is firstly proposed in the author's study to search the optimal policy after reaching the goal state. For practical operations, this new algorithm is extended by adding the rolling horizon approach, and some derived methods are compared with the optimal fixed-time control and adaptive control on the evaluation of traffic delay. Experimental results obtained by the simulations of symmetrical and asymmetrical traffic flow scenarios show that the FSDP method can perform quite well with high efficiency and good qualities in traffic control.
Rare earth smart nanomaterials for bone tissue engineering and implantology: Advances, challenges, and prospects

Abstract Bone grafts or prosthetic implant designing for clinical application is challenging due to the complexity of integrated physiological processes. The revolutionary advances of nanotechnology in the biomaterial field expedite and endorse the current unresolved complexity in functional bone graft and implant design. Rare earth (RE) materials are emerging biomaterials in tissue engineering due to their unique biocompatibility, fluorescence upconversion, antimicrobial, antioxidants, and anti‐inflammatory properties. Researchers have developed various RE smart nano‐biomaterials for bone tissue engineering and implantology applications in the past two decades. Furthermore, researchers have explored the molecular mechanisms of RE material‐mediated tissue regeneration. Recent advances in biomedical applications of micro or nano‐scale RE materials have provided a foundation for developing novel, cost‐effective bone tissue engineering strategies. This review attempted to provide an overview of RE nanomaterials' technological innovations in bone tissue engineering and implantology and summarized the osteogenic, angiogenic, immunomodulatory, antioxidant, in vivo bone tissue imaging, and antimicrobial properties of various RE nanomaterials, as well as the molecular mechanisms involved in these biological events. Further, we extend to discuss the challenges and prospects of RE smart nano‐biomaterials in the field of bone tissue engineering and implantology.
Propagation and Scattering Effects in Underwater Acoustic Communication Channels

Systematic measurements were performed to characterize shallow-water acoustic propagation channels for applications in the field of underwater communications. The survey was conducted in northern Europe and covers the continental shelf, Norwegian fjords, a sheltered bay, a channel, and the Baltic Sea. The measurements were performed in various frequency bands between 2 and 32 kHz. The outcome of the study is a variety of channels that differ in many ways, defying any attempt to define a typical acoustic communication channel. Miscellaneous forward propagation effects are presented, which are relevant to channel models for the design of modulation schemes, network protocols, and simulation environments.
Acupuncture at a Single Acupoint, BL1 (Jingming), Compared to Artificial Tears in Moderate to Severe Dry Eye Disease: A Randomized Controlled Trial

BackgroundThe global incidence of dry eye disease (DED) is very high. DED seriously affects the quality of life of patients; however, the current curative effect of medicine for moderate to severe DED is poor. This randomized clinical trial was planned to investigate the effect of acupuncture compared with artificial tears on moderate to severe DED.MethodsA randomized clinical trial was performed at 2 hospitals in China. 120 DED patients were randomly equally divided into an acupuncture and an artificial tear group. Either acupuncture or artificial tears was performed for an 8-week period, and a 32-week follow-up was performed. The primary outcome measure was the Schirmer-I test (SIT) value. The secondary outcome measures included the numerical rating scale (NRS) for improvement in ocular symptoms, the ocular surface disease index (OSDI), the tear-film break-up time (TBUT), corneal fluorescein staining (CFS), and acupuncture acceptability. Adverse events also were monitored and documented.ResultsFor the primary outcome, the mean changes in the SIT values were significantly different between the acupuncture (5.75 [2.53‒9.75]) and artificial tear (0.52 [-1.18‒2.46]) groups at week 8 (P = 0.01). The OSDI decreased by -16.14 (-35.40‒16.30) and − 7.65 (-19.25‒15.05) from baseline to week 8 in the acupuncture and artificial tear groups, respectively (P < 0.05). A significant decrease was found in the NRS score for eye dryness, eye pain, and blurred vision in the acupuncture group, as compared to the artificial tear group. However, the change in the average symptom NRS score, TBUT, and CFS did not differ significantly at week 8. Five cases experienced acupuncture-related adverse events.ConclusionsThis randomized clinical trial found that acupuncture at a single acupoint, BL1, significantly promoted tear secretion and improved multiple eye discomfort symptoms. Acupuncture showed greater benefits than artificial tears for moderate to severe DED. However, the study findings warrant verification.Trial registrationRegistration number: ChiCTR1800015831. Name of trial registry: Efficacy and safety of acupuncture in the treatment of moderate to severe dry eye disease: a randomized controlled trial.
The design, test, and application of the front end in 0.3THz wireless communication systems

Designed for space application, the paper presents the design, test and application of the front end in 0.3THz wireless communication. After test and fabrication, the terahertz wireless system is completed and indicates that HD video signals have been transmitted over a distance of 14m at the data rate of 1.5Gbps. The study shows the overall course of the test and application of the front end in wireless communication.
First Stage in the Construction of METU Turkish English Exam Corpus (METU TEEC)

This paper presents and discusses the first stages in the construction of the Middle East Technical University Turkish English Exam Corpus (METU TEEC), which has been compiled by a research team at Middle East Technical University (METU), Ankara, Turkey. The corpus consists of 1914 Linguistics and ELT exam papers (955483 words in total) written in timed circumstances with no access to reference material by the students at the Foreign Language Education (FLE) department at METU, Ankara between January 2005 and December 2012. The corpus is intended to cater for the needs of both theoreticians/researchers and practitioners/pedagogues; therefore, each of the scripts included in the corpus is tagged with rich meta information about the informants (e.g., age, gender, years of learning English), the exam (e.g., course, type of question, academic year) and exam writers (e.g., educational background, experience). This system allows the compilation of sub-corpora according to the needs and interests of the researchers and practitioners. The first sections of the paper present the context and the needs for such a corpus while the latter sections discuss the development of the coding and tagging systems employed for this corpus.
A Survey On Theoretical Analysis Of Different Planar Transmission Lines

This paper describes the comparative analysis of different types of planar transmission lines. Basically the stripline, microstrip and coplanar waveguide (CPW) has been discussed in brief. This paper shows focus on the advantage and tremendous characteristics of coplanar waveguide over the other transmission lines and with the help of CPW transmission techniques, substantial amount of efficiency has been achieved. The analysis is based on the basis of various parameters like, characteristics impedance, strip width, dielectric constants of the substrate, modes of field, dispersion, attenuation, component mounting, radiation and the frequency applied.
Identification of the Technical Condition of Induction Motor Groups by the Total Energy Flow

The paper discusses the method of identifying the technical condition of induction motors by classifying the energy data coming from the main common power bus. The work shows the simulation results of induction motor operation. The correlation between occurring defects and current diagrams is presented. The developed simulation model is demonstrated. The general algorithm for conducting experiments is described. Five different experiments to develop an algorithm for the classification are conducted: determination of the motors number in operation with different power; determination of the motors number in operation with equal power; determination of the mode and load of induction electric motor; determination of the fault and its magnitude with regard to operation and load of induction motor; determination of the fault and its magnitude with regard to operation and load of induction motor with regard to non-linear load in the flow. The article also presents an algorithm for preprocessing data to solve the classification problem. In addition, the classification results are shown and recommendations for testing and using the classification algorithm on a real object are made.