Miracle-dz/UniFAR-FTUs huggingface dataset:
Real-time and reliable human detection in clutter scene

To solve the problem that traditional HOG approach for human detection can not achieve real-time detection due to its time-consuming detection, an efficient algorithm based on first segmentation then identify method for real-time human detection is proposed to achieve real-time human detection in clutter scene. Firstly, the ViBe algorithm is used to segment all possible human target regions quickly, and more accurate moving objects is obtained by using the YUV color space to eliminate the shadow; secondly, using the body geometry knowledge can help to found the valid human areas by screening the regions of interest; finally, linear support vector machine (SVM) classifier and HOG are applied to train for human body classifier, to achieve accurate positioning of human body’s locations. The results of our comparative experiments demonstrated that the approach proposed can obtain high accuracy, good real-time performance and strong robustness.
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

This paper describes the numerical investigation of the centrifugal impeller response to downstream static pressure distortions imposed by volutes at off-design operations. An unsteady 3D Euler solver with non-reflecting upstream and downstream boundary conditions and phase-lagged periodicity conditions is used for this purpose. The mechanisms governing the unsteady flow field are analysed. A parametric study shows the influence of the acoustic Strouhal number on the amplitude of the flow perturbations. Radial forces calculated on backward leaned and radial ending centrifugal impellers, show non-negligible influence of the impeller geometry. NOMENCLATURE F Force L Length of blade channel M Mach number NbI Number of the impeller blades NCI RC Number of angular positions of impeller P Static pressure R Radius S Surface Sr Acoustic Strouhal number V Absolute velocity W Relative velocity c Speed of sound f Frequency of unsteadiness n Number of positions per blade pitch t Time At Time step Sl Reduced frequency Absolute flow angle Relative flow angle p Density w Non-dimensional rotational impeller speed Subscripts m Meridional r Radial 9 Circumferential z Axial 0 Total conditions 2 Impeller trailing edge Superscripts 1 Impeller inlet INTRODUCTION Centrifugal compressor impellers are exposed to downstream circumferential static pressure distortions when followed by non-axisymmetric volutes operating at off-design conditions. The static pressure distortion propagates upstream and creates a circumferential variation of the blade loading and forces in the impeller. A first consequence is a non-zero radial force on the shaft and extra load on the bearings. It also means unsteady flow in the rotating blade passages resulting in blade vibrations and additional noise. This increases losses and decreases the operating range of the compressor. Experimental studies on the flow in centrifugal compressor impellers with downstream static pressure distortion (Pfau (1967), Uchida et al. (1987), Sideris (1988)) indicate a non-linear variation of the outlet flow with large variations in the volute tongue region. Non-negligible circumferential flow variations are also detected upstream from the impeller, resulting in a variation of incidence. Presented at the International Gas Turbine and Aeroengine Congress & Exposition Houston, Texas June 5-8, 1995 This paper has been accepted for publication in the Transactions of the ASME Discussion of it will be accepted at ASME Headquarters until September 30, 1995 Downloaded From: http://proceedings.asmedigitalcollection. asme.org/ on 07/19/2018 Terms of Use: http://www.asme.org/about-asme/terms-of-use The unsteadiness of the incompressible flow in a channel of length L is normally characterized by the reduced frequency, = f L (1) V where V is the speed by which a particle is transported through the channel. However, the acoustic Strouhal number is more appropriate to characterize compressible flows. It is defined as the product of the reduced frequency times the Mach number:
Digital calibration method for defects evaluation of large fine optical surfaces

The digital calibration method, which is employed in the Surface Defects Evaluation System (SDES) for the defects evaluation of large fine optical surfaces, is presented in this paper. A criterion board, which comes from special design and careful fabrication, is employed to relate the dimensions of the defects and those of their images. The calibration procedure, including collecting of calibration images, digital image processing and calibration function fitting, is described in detail in this paper. Calibration experiments on scratch width and dig diameter were carried out at three different microscope magnification conditions. Experiment results show that following the proposed digital calibration method, micron-sized defects distributed sparsely on a large-aperture fine optical surface can be evaluated with micron accuracy and high efficiency.
Marx-stacked IGBT modulators for high voltage, high power applications

A number of applications that require <1 /spl mu/sec risetimes at high voltage and current cannot be easily satisfied with standard designs employing low voltage solid-state components driving a large step-up turns ratio transformer. North Star Research reports on the development of several products that employ the topological erection of voltages using a Marx generator stacking arrangement of lower voltage IGBT devices. The configuration does not place the semiconductors in a series arrangement, thereby eliminating a failure mode wherein the loss of a single device would over-stress the stack of IGBT parts. A plasma source ion implantation (PSII) modulator has been built using this technology development and provides 30 kV, 400 A, 1-50 /spl mu/sec variable pulse widths, and operates at 7.5 kW of average power. Peak powers as high as 2.4 MW have been demonstrated.
Affective variables in a foreign language immersion programme: a quantitative study

La inmersión lingüística ha cobrado mucha importancia durante las últimas décadas, ya que muchos estudiantes de todo el mundo se han beneficiado de esta experiencia tan motivadora. Por tanto, el objetivo principal de este estudio es determinar si una semana de inmersión en inglés tiene una influencia positiva en los niveles de motivación extrínseca e intrínseca, ansiedad en LE y los yoes en LE (Deci Ryan 2000, Dörnyei, 2005, Horwitz, Horwitz Cope 1991). Nuestros participantes son estudiantes de educación primaria (M: 11,5) que participaron en dicho programa. Estos cumplimentaron un cuestionario cuantitativo al llegar (test) y antes de terminar la semana (retest). Con el fin de comparar los resultados obtenidos en ambos momentos se utilizaron análisis ANOVA de un factor. Los resultados indicaron que después de la experiencia, la motivación aumenta, mientras que la ansiedad disminuye y la presencia de los yoes en los participantes se debilita.
The verification of effective leadership style for TQM

Purpose – The purpose of this paper is to verify the universal applicability of total quality management (TQM) across national boundaries. Specifically, the authors examined the validity of the isomorphic nature of TQM leadership style by comparing survey samples from both USA-based firms (n=112) and China-based firms (n=121). Design/methodology/approach – The authors collected the primary data through a survey research method. Confirmatory factor analysis (CFA) and structural equation modeling (SEM) were adopted to test the hypothesized research model. Findings – The study results did not support the universality of TQM practices. For example, the results reveal that in the USA-based firms, transformational leadership has a more significant positive influence on TQM practices, while in the China-based firms, transactional leadership has a more significant positive impact on TQM practices. Originality/value – Most of the existing literature on TQM assumed that the most effective TQM leadership style would.
Evaluation of turbo equalization for the high-rate HF waveforms of STANAG 4539

We have previously demonstrated that turbo equalization, or iterative equalization and decoding, can improve the receiver performance for medium-rate HF waveforms (up to 2400 bit/s using 8-PSK). In this paper, we apply turbo equalization to the high-rate waveforms (up to 9600 bit/s using 64-QAM) of STANAG 4539, and investigate the performance using simulations. The soft-in/soft-out (SISO) equalizer used is based on soft intersymbol interference cancellation followed by a linear filter. For the high-rate waveforms we find that this equalization algorithm needs some tweaking in order for the iterative procedure to converge. But when it does converge, turbo equalization outperforms a conventional single-pass receiver using decision-feedback equalization (DFE) by 6-7 dB in required signal-to-noise ratio to obtain a bit error rate of 10/sup -4/. Issues regarding computational complexity are also discussed.
Complex network

With the improvement in the accuracy of solutions and the increase in the complexity of social problems, social division becomes more important, and teamwork has become an important way to solve complex problems. The efficiency of a team is affected by many factors. How to evaluate the operation of a team is a very meaningful topic. A team consists of members. The characteristics and abilities of members determine their roles in a team, and naturally affect the efficiency of the team. The cooperation between team members is also an important factor in achieving high efficiency.
The Effect of the Carbon Nanotubes on the Mechanical Fracture Properties of Alkali Activated Slag Mortars

New nanomaterials such as carbon nanotubes and nanofibres considerably improve performance of current building materials and they can contribute to new application facilities. Alkali activated slag is a material having a great potential to be used in practice. The main drawback of this material is a high level of autogenous and especially drying shrinkage, which causes a deterioration of the mechanical fracture properties. The aim of this paper is introduce the effect of carbon nanotubes admixture on the microstucture and mechanical performance of alkali activated slag mortars. The three-point bending tests of specimens with central edge notch were performed. Method of acoustic emission was used during this testing.
Development of a novel two-channel microfluidic system for biomedical applications in cancer research

In this paper we present a novel two-channel microfluidic system which acts as an artificial blood capillary vessel to examine the migration steps of cancer cells in the microvasculature. The system consists of polycarbonate and is fabricated by combining hot embossing and thermal bonding. The optically transparent polycarbonate allows the use of live cell and fluorescence microscopy. The main feature of this device is that all processes take place under continuous laminar flow conditions at distinct tuneable shear rates.
Intergenerational service-learning, sustainability, and university social responsibility: A pilot study

This paper presents a study of university social responsibility (USR), carried out through an innovative educational action. The students of the studied classrooms in the University of the Basque Country (UPV/EHU) collaborated with a social entity Emmaus Social Foundation dedicated to environmental sustainability, social justice and the social and solidarity economy to provide community services through a service-learning methodology. Using a mixed method approach, we combined the practical experience of the social entity with an active student-centred teaching methodology in order to foster the acquisition of general and specific competencies related to sustainability and social justice. The aim was to create learning connections between members of the university community and links with the environmental and social reality of the Basque Country. This pilot study was carried out in the first term of the 2018–2019 academic year. This work allowed (a) critical knowledge to be generated by incorporating and hybridising discussion elements of social justice, such as sustainability; (b) intergenerational participation processes to be generated between elders, university students and social organisations in order to acquire general and specific learning competencies and (c) social and environmental needs to be addressed through community services. Keywords: Higher education, intergenerational learning, service-learning, teaching innovation, university social responsibility.
The effects of cerebellar transcranial direct current stimulation on the cognitive stage of sequence learning

Though the cerebellum has been previously implicated in explicit sequence learning, the exact role of this structure in the acquisition of motor skills is not completely clear. The cerebellum contributes to both motor and non-motor behavior. Thus, this structure may contribute not only to the motoric aspects of sequence learning, but may also play a role in the cognitive components of these learning paradigms. Therefore, we investigated the consequence of both disrupting and facilitating cerebellar function using high definition transcranial direct current stimulation (HD-tDCS) prior to the completion of an explicit motor sequence learning paradigm. Using a mixed within- and between-subjects design, we employed cathodal (n=21) and anodal (n=23) tDCS (relative to sham), targeting the lateral posterior cerebellum, to temporarily modulate function and investigate the resulting effects on the acquisition of a sequential pattern of finger movements. Results indicate that cathodal stimulation has a positive influence on learning while anodal stimulation has the opposite effect, relative to sham. Though the cerebellum is presumed to be primarily involved in motor function and movement coordination, our results support a cognitive contribution that may come into play during the initial stages of learning. Using tDCS targeting the right posterior cerebellum, which communicates with the prefrontal cortex via closed-loop circuits, we found polarity-specific effects of cathodal and anodal stimulation on sequence learning. Thus, our results substantiate the role of the cerebellum in the cognitive aspect of motor learning and provide important new insights into the polarity-specific effects of tDCS in this area. New & Noteworthy The cerebellum contributes to motor and cognitive processes. Investigating the cognitive contributions of the cerebellum in explicit sequence learning stands to provide new insights into this learning domain, and cerebellar function more generally. Using HD-tDCS, we demonstrated polarity-specific effects of stimulation on explicit sequence learning. We speculate that this is due to facilitation of working memory processes. This provides new evidence supporting a role for the cerebellum in the cognitive aspects of sequence learning.
Large-eddy simulations of impinging over-expanded supersonic jet noise for launcher applications

During the lift-off phase of a space launcher, powerful rocket motors generate harsh acoustic environment on the launch pad. Following the blast waves created at ignition, jet noise is a major contributor to the acoustic loads received by the launcher and its payload. Recent simulations performed at ONERA to compute the noise emitted by solid rocket motors at lift-off conditions are described. Far-field noise prediction is achieved by associating a LES solution of the jet flow with an acoustics surface integral method. The computations are carried out with in-house codes CEDRE for the LES solution and KIM for Ffowcs Williams & Hawkings porous surface integration method. The test case is that of a gas generator, fired vertically onto a 45 degrees inclined flat plate which impingement point is located 10 diameters from nozzle exit. Computations are run for varied numerical conditions, such as turbulence modeling along the plate and different porous surfaces location and type. Results are discussed and compa.
Disinformation in the Brazilian pre-election context: probing the content, spread and implications of fake news about Lula da Silva

ABSTRACT This research scrutinizes the content, spread, and implications of disinformation in Brazil’s 2018 pre-election period. It focuses specifically on the most widely shared fake news about Lula da Silva and links these with the preexisting polarization and political radicalization, ascertaining the role of context. The research relied on a case study and mixed-methods approach that combined an online data collection of content, spread, propagators, and interactions’ analyses, with in-depth analysis of the meaning of such fake news. The results show that the most successful fake news about Lula capitalized on prior hostility toward him, several originated or were spread by conservative right-wing politicians and mainstream journalists, and that the pro-Lula fake news circulated in smaller networks and had overall less global reach. Facebook and WhatsApp were the main dissemination platforms of these contents.
Using work breakdown structure models to develop unit treatment costs

This article describes the US Environmental Protection Agency's new cost modeling approach to developing unit costs for drinking water technologies. The technique uses a work breakdown structure (WBS) methodology, which involves dividing technology into discrete components for the purpose of estimating unit costs. The article demonstrates the application of this approach for three technologies that are effective at removing volatile organic compounds (VOCs) from drinking water: packed tower aeration, multistage bubble aeration, and granular activated carbon. It presents example outputs, for illustration only, for these three WBS technology models for the removal of trichloroethylene, which, among the regulated VOCs, occurs most commonly in drinking water. The WBS models were designed for the purpose of estimating the national costs of drinking water regulations. As such, they are intended to be transparent and versatile.
Biphasic Injection for Masseter Muscle Reduction with Botulinum Toxin

Masseter Muscle Hypertrophy (MMH) is a well-known clinical benign condition that is not gender-specific and it can be monolateral or bilateral. Botulinum Toxin type A (BoNTA) injection has been widely described for MMH treatment and non-surgical facial slimming. BoNTA masseter injections have high efficacy and safety profile, but the risks of side effects remain. Muscular bulging during mastication is a complication due to the superficial overcompensation of masseteric fibers in response to neurotoxic weakening of the deep masseter. We present a biphasic-injection technique for BoNTA administration, based following anatomical concept and developed in order to prevent paradoxical bulging. A total of 98 treatments from 2015 to 2020 were performed with this technique. No remarkable complications occurred in our study. No cases of loss of full smile, difficulty in mouth opening, dizziness, headache, neurapraxia, and xerostomia were reported. A case of asymmetric smiling was self-resolved within a week. No patient claimed transient muscle weakness as distressing. No cases of paradoxical bulging were observed. Extensive knowledge of muscular anatomy and appropriate injection technique are key factors in achieving the desired result and avoiding complications. We feel that sharing this tip could be helpful for all the physicians involved in MMH treatment with BoNTA.
A novel TEM-TE/sub 11/ mode converter

A novel mode converter that transforms coaxial transverse electromagnetic (TEM) mode to TE/sub 11/ circular waveguide mode is investigated. It is shown that with four metal plates inserted in the coaxial waveguide, the TEM mode will be converted to coaxial TE/sub 11/ mode, and finally, it forms a TE/sub 11/ conventional circular waveguide mode. The experimental test results are in good agreement with the computer simulations, which demonstrates the feasibility of the mode converter.
Health Hazard Assessment of Pyridaben Residues in Egyptian Strawberries

ABSTRACT Dissipation behavior and hazard assessment of the insecticide/acaricide pyridaben applied to strawberries were investigated under the climatic conditions of Egypt. A validated gas chromatographic method (GC-μECD) was used to determine pyridaben residues when applied at the recommended rate and twice this rate. The average recoveries were in the range between 95.8% and 103% with associated relative standard deviation not exceeding 14.5%. The estimated limit of quantification for pyridaben was 0.005 mg/kg. The field results showed that pyridaben dissipated rapidly in strawberries and had a half-life of approximately 2.3 days. The hazard assessment was evaluated by using the hazard quotient (HQ). The results showed that the HQ value was significantly less than HQ = 1. This result implied that the hazard of pyridaben use in strawberries even at double the recommended dosage was negligible to human. This study could provide guidance for the safe and reasonable use of pyridaben in strawberries and to prevent health problems to consumers; however, further hazard assessment studies are needed to ascertain the hazard of pyridaben residues on strawberries to vulnerable groups, including children, pregnant women, and elderly consumers.
A study of two control methods for full bridge converters: Soft switch bypass and current mode control

Abstract : In a broad sense, there are now 3 basic categories for high power (above several KW) DC/DC converters: (1) Forced commutation (FC) (2) Resonant (R) (3) Soft switch (SS). Some topologies that are combinations of the above also have been proposed, such as certain pulse width modulation (PWM)-resonant arrangements. The first part of this project was a proposed improvement of the third category, the soft switch. The basic idea of this new converter was to use two additional switches that would bypass the loading during part of the operating cycle if the current decreased below a certain level. The motivation for this was to retain the soft switching characteristic at light loads--a common problem with soft switch converters. Although the bypass circuit proved functional, certain problems were uncovered which raise doubts about its ultimate feasibility. Because of these problems, the research emphasis was shifted from the bypass to an improve current mode control (CMC) converter that promised better results.
Crystal Structure and Antioxidant Activity of 6-Gingerol Oxime

Under the acidic condition, 6-gingerol (C17H26O4) reacted with hydroxylamine to generate 6-gingerol oxime (C17H27NO4). Single-crystal X-ray diffraction with CuKα radiation (λ = 1.54184 Å) revealed the crystal belongs to the orthorhombic system, the space ground is P212121 with a = 5.24240(10), b = 25.7792(4), c = 25.9824(5) Å, V = 3511.39(11) Å3, Z = 8, Mr = 309.40, Dc = 1.171mg/mm3, μ = 0.669mm-1, S = 1.035, F(000) = 1344.0, the final wR2 was 0.1132 (all data) and R1 was 0.0412 [I>2σ (I)]. Two molecules compose one monomeric unit in the crystal. And the hydrogen bonds construct the dimer and the integral crystal spacial structure. The antioxidant activity of the 6-gingerol oxime was tested by the scavenging effect on DPPH radical and potassium ferricyanide reducing power test while Vitamin C was regarded as the comparison. The IC50 of the oxime for the scavenging effect on DPPH was 0.0471 g/L which was less strong than Vitamin C. The reducing power of Vitamin C was about three times powerful than the 6-gingerol oxime.