Miracle-dz/UniFAR-FTUs huggingface dataset:
Step-Down Piezoelectric Transformer for AC-DC Converters

In this paper, a new piezoelectric transformer for AC-DC converters is presented. This piezoelectric transformer, with a multilayered construction in the thickness direction, operates in a fundamental contour-extensional vibration mode. Output impedance is designed to be low, approximately several tens of ohms. First, we simulated the design of the transformer using equivalent circuit method and finite element method (FEM) analyses. We calculated that the transformer could work with an eficiency higher than 95% and a gain of 0.4 at a resonant frequency of 140 kHz. Second, we fabricated a transformer of 14 mm length, 14 mm width and 5.8 mm thickness and examined it. It was found that the transformer exhibited a 0.4 gain and 96.3% efficiency at 135 kHz, when the temperature increase was 30°C. We applied the transformer to the fabrication of an AC-DC converter using a half-bridge zero voltage switching circuit, and examined the converter. It was found to achieve good line and load regulation, and the highest efficiency of 90% was obtained for Vin=80–120 Vac, Vout=13 Vdc, and Iout= 0.8–1.5 A.
Determining Flight Task Proficiency of Students: A Mathematical Decision Aid

Accurate appraisal of student performance during and after training is important for the proper functioning of the training system and realization of training goals. Training systems-and particularly flight training programs-rely heavily on expert assessors′ determination of student proficiency. Research is needed that will lead to improvements in the reliability and accuracy of these assessments. Recent research in decision making suggests that errors are frequently introduced because of the limited capabilities of people to integrate information and reach accurate conclusions. Mathematical decision aids appear to be helpful in reducing these errors. A decision aid using Wald's binomial probability ratio test and the sequential examination of student task performances was adapted to a training application. The decision aid required significantly less task trial information and predicted subsequent task performance more accurately than did expert assessors using the current assessment method. When students performed inconsistently and below the required flight task standards, instructors were more willing to declare proficiency than was the decision aid. This finding was especially apparent on the more difficult flight tasks.
Saline water desalination with vapour capture device: a literature review of foundational technologies and underlying principles

This review was motivated by the growing need for sustainable water supply technologies in arid lands worldwide. A key driver of this review is to evaluate the potential of presently unused freshwater sources such as from evaporative brine management technologies. In doing so, this paper provides a conceptual building block for innovative water systems in the future with a focus on ecologically, socially and economically sustainable freshwater production. The utilization of solar thermal and wind energy as the principal drivers for brackish and saline water desalination projects provides the link between the technologies and devices that are discussed and evaluated in this review. Of the solar still concepts reviewed, higher productivity rates are achieved with increased optimization of heat and mass transfer processes within the system and productivity is closely linked to the technological complexity of the stills. Water production ranges from 2 to 3 L/m2/day for passive stills up to 100 L/m2/day and more for novel systems with multiple latent heat use. Still–greenhouse systems and seawater greenhouse systems are capable of producing distilled water while providing a vital humid environment for the growth of crops in a greenhouse system. Water production rates of 0.5–2.5 L/m2/day for ‘still in a greenhouse’ systems and up to 55 L/m2/day for seawater greenhouses with improved passive condenser technology can be achieved. Water vapour producing technologies such as wind-aided intensified evaporation, solar dryer technology or the bubble column concept, are assessed for their potential to form part of a novel water desalination scheme.
Review of Browser Extensions, a Man-in-the-Browser Phishing Techniques Targeting Bank Customers

Initially, online scammers (phishers) used social engineering techniques to send emails to solicit personal information from customer in order to steal money from their Internet banking account. Data, such as passwords or bank account details, could be further used for other criminal activities. For instance, the scammers may intend to leave the victim’s information behind after they have successfully committed the crime so that the police can suspect the visible evidence as a suspicious criminal. Many customers are now aware of the need to protect their banking details from the phishers by not providing any sensitive information. Recently, phishing attacks have become more sophisticated and targeted to the online banking users. Hence, this paper reviews one form of a current type of phishing attack known as a ‘man-in-thebrowser’. It specifically focuses on the use of browser extensions, including their operational strategies. Techniques to identify, minimize, and prevent this type of attack are considered. Lastly, the author provides specific advice for the bank customers based on her research interests and experience in online banking security.
Ophiostomatales isolated from two European bark beetles, Hylurgus ligniperda and Orthotomicus erosus, in California

Two European pine-infesting bark beetles, Hylurgus ligniperda and Orthotomicus erosus, were first detected in July 2003 in Los Angeles, California and in May 2004 in the Central Valley of California, respectively. These bark beetles (Coleoptera: Curculionidae: Scolytinae) are common vectors of fungi in the Ophiostomatales, some of which are tree pathogens or causal agents of blue stain of conifer sapwood. Ophiostomatales were isolated on a cycloheximide-amended medium, which is semi-selective for the growth of Ophiostoma and related genera. In total, eight identified species and seven unidentified species of Ophiostomatales were isolated from 118 adults of H. ligniperda collected from infested pine logs at two sites in California. In the case of H. ligniperda, Ophiostoma ips and Grosmannia galeiforme were isolated from 31% and 23% of the 118 beetles, respectively. The other species isolated included O. piceae (isolated from 9% of the beetles), O. querci (8%), and a new species that will be described as Leptographium tereforme (6%). Grosmannia huntii, L. serpens, three Sporothrix spp. , O. floccosum, O. stenoceras, two unidentified Hyalorhinocladiella spp. , and a sterile fungus were each isolated from less than 5% of the beetles. In contrast, one identified species and four unidentified species of Ophiostomatales were isolated from 202 adults of O. erosus collected from infested pines at four sits in California. Ophiostoma ips was isolated from 85% of the 202 adults of O. erosus. Beside O. ips, a sterile fungus was isolated with 16% frequency, and two Sporothrix spp. and a species of Hyalorhinocladiella were isolated with fewer than 3% of the O. erosus. Most of the identified species were previously known in the USA and have been found in association
The wing apparatus and flapping behavior of hymenoptera

The wing apparatus of Hymenoptera was observed with a scanning electron microscope, and the structure and function of insect wings were studied. The measurements of displacement of extrinsic skeleton vibration produced by wing flapping of a wasp were made by an optical displacement detector system. The free flight of the wasp was analyzed by a three dimensional motion analysis system. The results of a series of measurements revealed the flight characteristics of Hymenoptera, such as the wing tip velocity, wing path, wave form of extrinsic skeleton vibration, and so forth.
Misdiagnosis of Spinal Dural Arteriovenous Fistula: An Analysis of 12 Cases

Background: Spinal dural arteriovenous fistula (SDAVF) is a rare spinal vascular disease. The clinical misdiagnosis rate is very high. The highest misdiagnosis rate is reported in orthopedics. The specific reason for misdiagnosis remains unclear. Objective: To investigate the clinical and imaging manifestations of SDAVF, analyze the causes of misdiagnosis, propose countermeasures, and improve the orthopedists and other specialists’ understanding of this disease. Methods: The clinical data, diagnosis and treatment of 12 patients who had SDAVF that was misdiagnosed as a different disease were retrospectively analyzed, and the modified Aminoff-Logue Disability Scale (ALS) scores before and during follow-up were compared. Results: From 2014 to February 2019, 15 patients were diagnosed with SDAVF at our institution. Twelve (80%) were misdiagnosed; of these, 6 (50%) were misdiagnosed more than twice, and 6 patients (50%) were misdiagnosed at least once. The initial diagnoses included lumbar spinal stenosis and lumbar disc herniation (LDH) in 6 patients, cervical spinal stenosis in one patient, benign prostatic hyperplasia (BPH) in one patient, myelitis in 2 patients, and syringomyelia in one patient. After the initial diagnosis, one patient was misdiagnosed with LDH, one was misdiagnosed with subacute combined degeneration of the spinal cord, and 4 were misdiagnosed with myelitis. The clinical manifestations mainly included weakness and numbness of the lower limbs, urinary symptoms, and numbness of the perineal area. In the 12 misdiagnosed patients, magnetic resonance imaging(MRI) showed signs of spinal cord edema and typical or atypical flow-void patterns. One patient had undergone extended cervical decompression and lumbar decompression. All patients eventually underwent microsurgical treatment. The average follow-up duration was 0.9 years. The modified ALS scores showed significant improvement in gait, bladder function and bowel movement, and the differences before and during follow-up were statistically significant (P<0.05). Conclusion: When patients, especially those with bladder and bowel dysfunction, have symptoms such as weakness of the lower limbs and/or numbness, a diagnosis of SDAVF should be considered. Furthermore, if MRI shows signs of spinal cord edema and typical or atypical flow-void patterns, the diagnosis of SDAVF should be strongly considered, and further angiography is needed to confirm the diagnosis.
Depression and anxiety among high school student at Qassim Region

Background: Adolescence is a stage of changes in body and behaviour that may affect mental health. We found that no study measures the depression and anxiety in adolescence in our region, so we want to measure it and then try to improve our community. Aim: We aim to estimate the prevalence of depression and anxiety among high school students at Qassim region. Methods: A cross-sectional study done in al-Qassim region. A targeted population was secondary school students. The sample size was 1245 students. We used the questionnaire tool the Patient Health Questionnaire (PHQ-9) to assess depression in the students and the GAD7 for anxiety. The data had been gathered through MS Excel then exported to the Statistical Packages for Social Sciences (SPSS) for analyses. A P value cut-off point of 0.05 at 95% confidence interval (CI) was used to determine statistical significance. The analyses measure the association between socio-demographic and other related variables in the survey by using a Chi-square test. Result: Our study shows that depression by using (PHQ-9) among the 1245 students, 325 (26.0%) were not depressed, 423 (34%) were mildly depressed, 306 (24.6%) were moderately depressed, whereas 129 (10.4%) were moderately severe depressed and 62 (5.0%) were severely depressed. Anxiety by using the GAD-7 questionnaire, it was revealed that out of 1245 students, 455 (36.5%) of them were without anxiety, 425 (34.1%) of them were having mild anxiety, 243 (19.5%) of them were having moderate anxiety and 122 (9.8%) were having severe anxiety. Depression and anxiety, according to gender (P value <0.001), show a significant relationship. Conclusion: We have to raise the awareness of the mental health in our community as the prevalence of mental disorder has significantly increased over time. Health services should make health education for students on how they deal with stress and depression through exercise and good sleep.
Evaluating the Glycogenic Activity and Therapeutic Capacity of PPP1R3D in a Mouse Model of Lafora Disease

Lafora disease (LD) is an intractable, neurodegenerative epilepsy caused by loss-of-function mutations in the EPM2A or EPM2B genes. Central to LD is the accumulation of malstructured glycogen (Lafora bodies; LB) in neurons, a consequence of dysregulated glycogen synthesis. Glycogen synthase catalyzes glycogen formation and is activated by dephosphorylation. The latter is mediated by glycogen-targeting subunits of protein phosphatase 1, including PTG (R5) and R6, known formally as PPP1R3D, both abundantly expressed in brain. PTG knockout in LD mice rescues LD, including near-complete disappearance of LB and neurodegeneration. I examined whether the same could be achieved with R6 knockout. Despite significant brain glycogen and LB reductions in R6-deficient-Epm2a mice, substantial amounts of LB remained and neurodegeneration was not rescued. This partial effect remains unexplained. Future experiments to resolve the difference with PTG will shed important light on both LB formation and Lafora disease, and brain glycogen metabolism.
Assessing the Changes in Operating Traffic Stream Conditions Due to Weather Conditions

A better understanding of the effects of weather on traffic and more specifically adverse weather events is fundamental for road operations. Recognizing this need advances in sensor technologies enabling real time monitoring of roadways and environmental conditions offer nowadays ways to create better decision support tools for road managers. In this respect a comprehensive analysis of the impact of weather conditions on motorway traffic flow is undertaken. This paper offers a synthesis of four complementary studies, conducted for the assessment of the weather effect on traffic flow and safety. More precisely, this work reports studies that focused on assessing the impact of rain on road traffic operations. An important innovative aspect of this work is that traffic data are recorded (some are individual, others are aggregated) simultaneously with weather and surface data from a road weather information system (RWIS). Then, an in-depth analysis of the effect of weather (rain occurrence) is conducted on the most relevant parameters used for assessing performance of traffic operations and traffic risk characterisation (speed, headway, traffic composition and platooning).
Prevalence of Salmonella Spp. Bacteria Antibiotic Resistency Indigestion Tract in the Broiler Farms of Subang District

This study is aimed to estimate the prevalence of resistant Salmonella spp. , determine the spread of bacterial resistance and investigate the serotypes of bacteria in the chicken’s digestion tract in the broiler farms in Subang District. As many as 74 farms were chosen, five poled caeca samples were taken from each farm and tested for isolation and identification of Salmonella spp. Salmonella isolates obtained were tested antimicrobial susceptibility against 8 antibiotics using the agar dilution method. The antibiotics were gentamycin, tetracycline, ciprofloxacin, nalidixic acid, ampicillin, chloramphenicol, trimethoprim, and sulfamethoxazole. The result showed that 8 out of 74 samples were positive for Salmonella. The prevalence of Salmonella spp. in the digestion tract was 10.8%; 95% confidence interval 3.7%-17.9%. Based on the serological test eight serotypes obtained were Salmonella enteritidis, Salmonella oslo, Salmonella narashino, Salmonella nakuru, and Salmonella nordufer. The result of antibiotic resistance test showed that from 8 Salmonella isolates obtained, 12.5% were found to be sensitive, 75% isolates were resistant to one or two antibiotics, and the remaining 12.5% isolates were resistant to more than two antibiotics; 95% confidence interval (0%-35.4%). The prevalence of resistant Salmonella spp. bacteria in chicken digestion tract in broiler farms in Subang District was high, so integrated control program to reduce antimicrobial resistance problem in broiler farm are greatly needed.
Prediction of actuation displacement and the force of a pre-stressed piezoelectric unimorph (PUMPS) considering nonlinear piezoelectric coefficient and elastic modulus

In this paper, material nonlinear behaviors of the piezoceramic, PZT5A, under high electric field and various stress conditions were experimentally investigated and the actuation performance analysis of PUMPS (piezoelectric unimorph with mechanically pre-stressed substrate) considering the material nonlinearities of the embedded PZT5A was accomplished. Empirical functions, which represent stress effects on the performance of the PZT5A, were established by measuring the induced piezoelectric strain versus electric field curves of the PZT5A under various applied stresses and electric fields. In addition, variation of the elastic modulus of the PZT5A was evaluated based on the frequency response functions under various electric fields. The nonlinear characteristics of the PZT5A were implemented in the ABAQUS simulation model for the performance analysis of PUMPS. With the nonlinear material properties of the PZT5A, the actuation displacement and force of PUMPS were accurately predicted.
Realtime Face Recognition for Intelligent Door System

This paper focus on in-deep analysis of the majority of both hand-craft based and CNN-based that proposed in states-of-the-art for face detection and face recognition method. This issue has been researched for recent decades as it enjoys many practical applications such as entertainments, security, tracking, human-machine interaction and so on. However, this problem has been faced to many challenges such as complex background, illumination, face pose, states of face, fake face. Which lead to high time cost, and low accuracy system. In recent times, thanks to the cutting-edge technique that give impressive performance on both hand craft-based and deep learning-based method. There have been improvement in detecting face exploiting feature vectors. Therefore, in this research, we comparing face detection model such as Haar Cascade[6], Dlib[19] and YOLO [27]. Then, we consider and compare affects of methods when extract feature vectors. Besides, we try to examine on various classifications to obtain the suitable system. Evaluation results confirm that the best accuracy rate achieves at 97.83%. The proposed method suggests a feasible solution addressing technical issues in using hand craft-based face recognition. Moreover, we deploy a realtime intelligent door system that utilize face recognition results to automatically control door.
Theoretical modeling of axial flux squirrel cage induction motor considering both saturation and anisotropy

SUMMARY The objective of this paper is to investigate the torque–speed characteristics of single-phase axial flux squirrel cage induction motors using a two-dimensional (2-D) electromagnetic field analysis. In this study, the effect of saturation and anisotropy of electromagnetic cores is taken into account. Furthermore, the effect of harmonics is considered in the analysis. Then, 2-D and three-dimensional time-stepping finite-element (FE) analysis is employed to validate theoretical results. Finally, the motor prototype is constructed and tested. Good agreement between analytic, FE and experimental results shows the accuracy and success of proposed model. Copyright © 2012 John Wiley & Sons, Ltd.
Analysis and design of an advanced static VAr compensator using quad-series voltage-source inverters

This paper presents an advanced static VAr compensator (ASVC) using quad-series voltage-source inverters. The ASVC consists of four three-phase voltage-source inverters having a common DC capacitor and four three-phase transformers, the primary windings of which are connected in series to each other. Although each inverter outputs a square wave voltage, the synthesized output voltage of the ASVC has a 24-step wave shape. This results not only in a great reduction of harmonic currents and DC voltage ripples but also in less switching and snubbing losses. This paper develops the analysis of the transient response and the resonance between AC reactors and the DC capacitor with the focus on practical use. Experimental results obtained from a small-rated laboratory model of 10 kVA are also shown to verify the analysis leading to the design of the DC capacitor. The experimental and analytical results agree well each other.
ASSESSMENT OF TWO PHASE FLOW IN A VENTURE CONVERGENT- DIVERGENT NOZZLE.

The present study emphasized on the information of cavitations during the dual phase flow i.e. (water and vapor) in venture converge-diverge nozzle. The choice of nozzle with a transparent material (PMMA), was found suitable for the observation and measurements. The model of this problem of defining dual compressible viscous flow, and k-epsilon model. The comparisons of numerical calculation and experimental observation were found to be comparatively coincidable in cavitational zone and throat pressure, and fractional phase flow.
Posttrauma Employability of People With Symptoms of PTSD and the Contribution of Work Environments

Abstract The role of work environments in employability was examined at approximately 8 months postaccident in a sample of 69 trauma-exposed, injured adults with and without PTSD. Results showed that participants with PTSD reported significantly lower employability than those without PTSD and this translated into significantly poorer return-to-work rates. Two work environment dimensions, low work support and poor organisational structure, were significantly associated with low employability in the sample. Low levels of work support were significantly related to high PTSD symptom severity. A combination of 3 variables, PTSD symptom severity, physical functioning, and workplace organisational structure, accounted for 60% of variation in employability. Interventions in the workplace should aim to minimise and accommodate PTSD symptomatology and physical dysfunction. In addition, this study has also shown that workplace-based interventions should be aimed at clarifying expectations about job tasks, and promoting moderate managerial control in the workplace. These factors should be considered for inclusion as standard disability management practices for this population.