Miracle-dz/UniFAR-FTUs huggingface dataset:
A single-phase voltage-source utility interface system for weak AC network applications

This paper presents a novel control strategy for single-phase voltage-source electric utility interface systems. The proposed scheme employs a single-phase voltage-source half-bridge inverter and a third-order T-filter. The stability of the proposed scheme is first investigated, using the state-space averaging technique and root-locus method, in order to select appropriate feedback control variables that produce stable feedback operation. Secondly, based on the results of the stability analysis, both the capacitor current and voltage are employed in inner and outer feedback control loops respectively, in order to achieve stable operation of the proposed technique and to ensure sinusoidal load voltage and current in the power circuit. Thirdly, computer simulation results of the proposed utility interface system for operation of the power circuit from 'cold' start to full load is presented. It is shown that the proposed control scheme offers improved performance for utility interface applications. It is simple to implement, and capable of producing nearly perfect sinusoidal line current and voltage waveforms at any desired power factor with moderate switching frequency and reasonable size of filter parameters. Furthermore, it is compatible with both weak and large AC networks. Finally, experimental verification of the operation of the proposed scheme at various load power factors is provided. <<ETX>>
SIMULATION AS A TOOL FOR ANALYZING CROP RESPONSE TO CLIMATE CHANGE

ABSTRACT Simulations of soybean and com (maize) growth for the southeastern U.S.A. were run for 30 baseline years of weather data, 1951-80, for 19 locations with and without supplemental irrigation, using SOYGRO and CERES-Maize crop models. Runs were also made for climatic changes predicted by two General Circulation Models (GCMs) for a doubling of atmospheric carbon dioxide. One climate change scenario resulted in over 50% reduction in rainfed seed yields for both crops, while the impact of the second scenario was negligible. Under irrigation, the simulated results indicated doubled CO2 produced 20% less corn and 14% more soybean, somewhat independent of the climate change scenario. Irrigation water demand was significantly increased.
Developing Resilience, Independence and Well-being in Older Adults through Interactive Outdoor Space

© Copyright 2017 NCEUB. The morbidity rates in populations of older persons are rising in parallel with increases in life expectancy. Increases in the numbers of older persons, many of whom will be physically dependent, will challenge communities both economically and socially. To compensate for this health loss and the subsequent demands placed on the health care system, there is a growing demand for effective preventative public exercise interventions to enable the ageing population to maintain independence and enjoy a healthier lifestyle. The provision of age-appropriate playground and exercise equipment for older persons has been gaining international popularity and is expected to become increasingly popular among local governments as a direct result of rhetoric relating to the development of age-friendly cities. Using a multidisciplinary lens, this project maps desired rehabilitation outcomes with exercise equipment design and landscape architecture. It seeks to identify both physical and motivational strategies that are most successful in maintaining good health and well-being in old age. Findings suggest that there is demand for open public space interventions that can safely train balance, muscular strength, and cardiovascular fitness. However, there is a lack of health research examining the usefulness and the sustainability of currently available equipment. There is also a necessity to address participation barriers and manage potential adherence issues that prohibit older persons from engaging in beneficial physical activity.
Research about Online Inspection System for the Assembly Quality of Automobile Gearbox Sliding Bracket

Gearbox sliding bracket is an important component of Automobile Gearbox. Because it has many parts which have little difference in shape and size, it is very easy to make mistake in assembly parts of this component. Due to mass production, it is high time to develop an online inspection system for the aseembly quality. Analysis the assembly characteristic of the component, this paper develop an online inspection system which is mainly composed of a central control system(CCS) and a sensor. Under the command of the CCS, the sensor is able to automatically inspect the component’s parts of which are wrong assmbly, reverse assembly and missing assmbly. Also the sensor can send the inspection information to the CCS. Subsequently, the CCS judges the information and dispalys the judgment result in time. At the same time, through the network, it is able to send the assembly quality information to the enterprise quality management system, such as the eligible amount, the reject amount, the qualification rate. This online automatic inspection system has run in good condition since it was officially put into operation at 2007 and its accuracy comes up to 100%.
P‐47: Algorithm for Regional Mura Reduction By Using Gamma‐Curve Transformation in LCD Panels

A mura that would downgrade the LCD panels is unavoidable during the manufacturing. When LCD displays come to the era of ultrahigh resolution, the function of mura-reduction represents more significant in Tcon design for cost reduction and improvement of display quality. In this paper, an algorithm of regional mura reduction is proposed, and demonstrated in HD displays. For hardware integration, a data compression method is also discussed to save the space of non-volatile memory.
Testing The Shear Strength of Clay in Sweden

Synopsis In this Paper an account is given of some apparatuses for testing shear strength which have previously been described only in Swedish. The routine methods used in Sweden for testing shear strength are also outlined, and their dependability is discussed. Finally, the reliability of the triaxial test is considered. Dans cette etude on rend compte de quelques appareils pour essayer la resistance au cisaillement qui n'ont ete decrits prealablement qu'en suedois. On indique aussi les methodes de routine utilisees en Suede pour essayer la resistance au cisaillement, et la croyabilite de ces methodes est soumise a discussion. Enfin, on examine la veracite de l'essai triaxial.
Automated underground residential distribution design. II. Prototype implementation and results

For pt.I see ibid., vol.8, no.2, p.637-43 (1993). The manual design of the underground electrical supply system for new residential developments (electrical plat design) often results in an overdesigned, costly, and nonstandardized solution. The intelligent decision support system for automated electrical plat design (DSS for AEPD) is an engineering tool aimed at automating electrical plat design. This tool combines the spatial analysis capabilities of a geographic information system (GIS) with the sophistication of artificial intelligence (AI) to deal with the complexity inherent in this type of problem. The results of the AEPD prototype implementation and an evaluation of the concept's feasibility are presented. >
Hybrid Method for License Plate Detection from Natural Scene Images

License plate detection is a key part in vehicle license plate recognition system. In this paper, we present a hybrid method for license plate detection from natural scene images for the all-day traffic surveillance environment. The proposed method includes two stages: rough detection and accurate detection. Coarse detection stage based on color edge and morphology can help finding the region of interest quickly; Accurate detection stage based on HOG and SVM accurately detect the vehicle license plate. The effectiveness of the proposed method has been proven by the experimental results on a large database of images.
Promoting Home Prepared Soy-dishes for Fighting Protein-Energy Malnutrition: Evidence from Demonstration Training

Malnutrition is a persistent problem in developing countries, and protein-energy malnutrition is the worst form of malnutrition associated with lack of energy and proteins. Malnutrition at the early stages of life can lower child resistance to infections, increase child morbidity and mortality, and decrease mental and cognitive achievement. Worldwide the most important step in the treatment of protein energy malnutrition is to correct nutritional imbalances. Increasing the amount of protein in cereal staple foods is the ideal solutions to problem related to malnutrition. Several studies reported that, increased protein content in soybean fortified cereals and tubers, which makes significant contribution towards the alleviation of protein-energy malnutrition. Soybean can be utilized mainly as fermented (e.g., sauce, miso, natto) and non-fermented (e.g., oil, milk, tofu, flour) foods. Therefore, this paper aimed to revise the contribution of home-prepared soy-dishes to combat protein-energy malnutrition.
Research on TD-LTE Wireless Communication Network Propagation Model Optimization and Visual Simulation Based on GIS

With the support of GIS spatial analysis technology, based on an in-depth study of the wireless propagation environment of a city, combined with the analysis of project requirements, it proposes to use the SPM model to correct the propagation model parameters, using SPM The wireless propagation model, and research and analysis of the SPM wireless propagation model correction algorithm, further corrected the parameters of a city's SPM wireless propagation model. On this basis, the propagation loss of several classic propagation models in different environments are compared, and the SPM propagation model suitable for the signal frequency band and propagation environment of this study is selected. The correction of the SPM propagation model is based on the designed correction principle and correction process, that is, the weighted least square method is used to fit and analyze the measured level data to obtain an SPM prediction improvement model with local characteristics, and according to the designed verification link Evaluation of the correction results shows that the accuracy requirements are met. Based on the corrected SPM prediction model, link loss calculations were performed on the 13 test base stations studied in the experiment, and the effective coverage radius of each base station community was obtained. In combination with GIS technology, model parameters and workers of each base station participated in the electronic map loading of the area Go to the network planning software to get the wireless signal coverage prediction map of each base station. Finally, according to the technical requirements of the TD-LTE system network planning and network optimization engineering, the objectiveness and rationality of the site selection and number of base stations in the area were verified, and specific problems regarding poor coverage and overlapping coverage in the area were proposed.
Investigation of the measurement precision of oil analysis instruments, using fully formulated oils. Part 1: spectroscopic instruments

Purpose – The aim of this study is to determine the variation of the different oil analysis instruments in terms of standard deviation and CV‐values, when measuring samples of fully formulated hydraulic and gear oils taken from working systems.Design/methodology/approach – In this investigation, two different spectrometric techniques, inductively coupled plasma‐optical emission spectrometers (ICP‐OES) and rotating disk electrode‐optical emission spectrometers (RDE‐OES), have been studied to determine the instruments' precision of measurement and ability to measure the absolute level of contamination. The study was based on a series of measurements using artificial contamination mixed with oil.Findings – The ICP has better precision of measurement of the two instruments, but cannot predict the absolute values of contamination when oil samples are only treated by organic solvent dilution if the samples include large or dense particles. It is therefore not too good, with the sample pre‐treatment method used,.
Strukturierte Polvorgabe für PMD Prozesse (Structural Pole Assignment for PMD Processes)

Abstract Der Artikel behandelt das Problem der strukturierten Polvorgabe für PMD (Polynomial Matrix Description) Prozesse, das im Zusammenhang mit dem Entwurf von Regelgesetzen entsteht, wenn die Lage der Eigenwerte der charakteristischen Matrix des geschlossenen Systems in der komplexen Ebene und außerdem die Struktur der Menge ihrer invarianten Polynome vorgegeben wird.
Fabrication and microwave characterisation of multilayer circuits for MMIC applications

A technique to fabricate novel multilayer monolithic microwave integrated circuit (MMIC) structures using polyimide as insulating dielectric layer is described. The polyimide layer formation, curing and dry etching processes are investigated in an attempt to obtain high quality dielectric layers suitable for MMIC applications. By employing this technique, MMIC design and circuit routings become much easier and conventional microstrip transmission lines and lumped passive components can be realised with effective use of the substrate material. In the paper it is shown that a V-shaped MMIC coplanar waveguide (CPW) transmission lines with low characteristic impedance and edge offset broadside directional couplers can easily be designed using the multilayer technique. This implementation can avoid the well known current crowding effects on the conductor edges. Within the Ku and K band frequency range, circuits have been characterised and show good performances. By using the same technique, miniaturisation of a lumped-distributed CPW ring-resonator bandpass filter can be achieved with built-in shunt capacitors. Two transmission poles and two transmission zeros could be implemented by introducing two discontinuities. The measured results show a 3 dB bandwidth of 3.7 GHz at 13.7 GHz.
Investigating Metrics Proposed to Prevent the Harvest of Leafy Green Crops Contaminated by Floodwater

Title of Document: INVESTIGATING METRICS PROPOSED TO PREVENT THE HARVEST OF LEAFY GREEN CROPS CONTAMINATED BY FLOODWATER. Mary Theresa Callahan Master of Science (M.S.), 2015 Directed By: Dr. Robert L. Buchanan Department of Nutrition and Food Science Center for Food Safety and Security Systems Pathogens can be transported by water through soil to contaminate distant crops. The California LGMA states that leafy green crops within 30ft of flooded soil should be destroyed due to potential contamination. Previously flooded areas should not be replanted for 60 days. This study investigated the transport of Salmonella enterica and Citrobacter freundii through soil in a model system with a positive slope (uphill). Field trials involving flooding one end of a spinach bed with a negative slope (downhill) with water containing Escherichia coli were also conducted. Soil type, soil moisture content, and slope affected bacterial movement. In field trials, E. coli was quickly transported to the 30ft boundary, and persisted significantly longer in the fall trial than the spring. These data suggest the LGMA metrics need to provide additional parameters to prevent the harvest of leafy green crops potentially contaminated by floodwater. INVESTIGATING METRICS PROPOSED TO PREVENT THE HARVEST OF LEAFY GREEN CROPS CONTAMINATED BY FLOODWATER
Using satellite observations of tropospheric NO2 columns to infer 
long-term trends in US NOx emissions: the importance of accounting for the free tropospheric NO2 background

Abstract. The National Emission Inventory (NEI) of the US Environmental Protection Agency (EPA) reports a steady decrease of US NOx emissions over the 2005–2017 period at a rate of 0.1 Mt a−1 (53 % decrease over the period), reflecting sustained efforts to improve air quality. Tropospheric NO2 columns observed by the satellite-based Ozone Monitoring Instrument (OMI) over the US show a steady decrease until 2009 but a flattening afterward, which has been attributed to a flattening of NOx emissions in contradiction with the NEI. We show here that the steady 2005–2017 decrease of NOx emissions reported by the NEI is in fact consistent with observed network trends of surface NO2 and ozone concentrations. The OMI NO2 trend is instead similar to that observed for nitrate wet deposition fluxes, where post-2009 flattening is due to an increasing relative contribution of non-anthropogenic background (mainly lightning and soils) and not to a flattening of anthropogenic emissions. This is confirmed by contrasting OMI NO2 trends in urban winter, where the background is low and OMI NO2 shows a steady 2005–2017 decrease consistent with the NEI, and rural summer, where the background is high and OMI NO2 shows no significant 2005–2017 trend. A GEOS-Chem model simulation driven by NEI emission trends for the 2005–2017 period reproduces these different trends except for the post-2009 flattening of OMI NO2, which we attribute to a model underestimate of free tropospheric NO2. Better understanding is needed of the factors controlling free tropospheric NO2 in order to relate satellite observations of tropospheric NO2 columns to the underlying NOx emissions and their trends. Focusing on urban winter conditions in the satellite data minimizes the effect of this free tropospheric background.
Determination and Correction of Individual Channel Time Offsets for Signals Involved in an Audio Mixture

A method for reducing comb-filtering effects due to delay time differences between audio signals in a sound mixer has been implemented. The method uses a multi-channel cross-adaptive effect topology to automatically determine the minimal delay and polarity contributions required to optimize the sound mixture. The system uses real time, time domain transfer function measurements to determine and correct the individual channel offset for every signal involved in the audio mixture. The method has applications in live and recorded audio mixing where recording a single sound source with more than one signal path is required, for example when recording a piano with multiple microphones. Results are reported which determine the effectiveness of the proposed method.
A resistorless CMOS bandgap reference with low temperature coefficient and high PSRR

A novel bandgap reference (BGR) with low temperature and supply voltage sensitivity without any resistor, which is compatible with standard CMOS process, is presented in this article. The proposed BGR utilises a differential amplifier with an offset voltage proportional to absolute temperature to compensate the temperature drift of emitter–base voltage. Besides, a self-biased current source with feedback is used to provide the bias current of the BGR core for reducing current mirror errors dependent on supply voltage and temperature further. Verification results of the proposed BGR implemented with 0.35 µm CMOS process demonstrate that a temperature coefficient of 10.2 ppm/°C is realised with temperature ranging from −40°C to 140°C, and a power supply rejection ratio of 58 dB is achieved with a maximum supply current of 27 µA. The active area of the presented BGR is 160 × 140 µm2.
Transition from Trichel-pulse corona to dielectric barrier discharge

An investigation was undertaken to examine the influence that thin circular solid dielectric barriers placed on the planar anode surface have on the stochastic behavior of Trichel pulses. It is shown that charging of the dielectric surface by the corona discharge introduces another memory effect that becomes increasingly significant as the point-to-plane gap spacing is reduced. At a sufficiently short gap distance, the charge on the dielectric causes the field at the point electrode to drop below the level required to sustain a corona discharge and at that point Trichel pulses cease. <<ETX>>
Analysis of a single-phase induction machine with a shifted auxiliary winding

This paper extents the method of multiple reference frames to the analysis of asymmetrical induction motors with nonorthogonal stator windings, with particular emphasis on the permanent split capacitor (PSC) machine. The predictions of the method are verified by comparison to both experimental results and to results obtained using a machine variable computer simulation. Once verified, the method is used to derive the transfer function relating rotor speed to load torque disturbance, which is of particular interest when analyzing PSC machines driving compressor loads. It is shown that the transfer function exhibits a distinct resonant point, and that the magnitude of the resonant peak increases as the motor approaches synchronous speed. It is also shown that the magnitude of the resonant peak may be lowered by increasing rotational inertia or rotor resistance.
Algorithm for evaluating nodal vector quantities in device simulation and its applications to modeling quantum mechanical effects in sub-50nm MOSFETs

An accurate and general algorithm for evaluating vector quantities, such as electric field, at the nodes in a finite volume discretization is presented. The algorithm is based on the integral form of Poisson's and the carrier continuity equations. Application to the analysis of sub-50nm MOSFETs with quantum mechanical (QM) effects is demonstrated. Other applications include the coupled electrothermal simulation (Joule heat) and modeling of impact ionization.
Simulation of an electro magnetic (EM) drive for a fast opening circuit breaker contact

The force between two current carrying bodies gained more interest due to new applications. This so-called Lorentz force is used for decades to accelerate or move objects, for instance for fast opening of DC circuit breakers. A novel electro-mechanical set-up has been developed, which accelerates a movable electrical contact of 2.8 kg extremely fast. In this contribution the developed mixed signal model of the electro-mechanical set-up has been discussed and the initial simulations have been compared with the first measurements. The simulated results are in good agreement with the measurements. (6 pages)
Experimental measurement of the surface velocity field in an externally induced sloshing tank

In this work, the unsteady free-surface velocities during the surge motion of a liquid tank are determined through experimental investigation. A new experimental approach has been discussed for capturing the free surface of the liquid during tank excitation. In order to avoid violent motion in the tank, the tank is excited with a low frequency (up to 47 per cent of the first-mode frequency) which leads to low-steepness waves in the container. When a container oscillates at a low excitation frequency, the wave amplitude A is usually small. Since the wave steepness E is directly proportional to the wave amplitude, the wave steepness is also small during the motion. The planar two-dimensional particle image velocimetry technique is used to calculate the U and V velocities of the free surface, while the interface location technique is used to determine the vertical velocity W of the interface. The velocities are measured for various liquid fill levels and excitation frequencies. The average line velocity V w near the tank wall and the average line velocity V c near the velocity tank centre with respect to time are estimated and compared with the tank velocity. The observed flow patterns indicate the presence of complicated flows during the sloshing experiment.