Miracle-dz/UniFAR-FTUs huggingface dataset:
A novel dead time minimization algorithm of the PWM inverter

The dead time in PWM inverters is generally used to avoid the short circuit of the DC source. Even though the dead time is chosen to be just a few microseconds, the adverse effects of that on an entire cycle of the inverter output voltage cause serious problems such as waveform distortion and voltage drop. In this paper, a novel dead time minimization algorithm is proposed for improving the inverter output performance. The proposed algorithm consists of forbidding unnecessary triggers for the inverter switches that are not turned on although the gate drive signal is triggered. The validity of the proposed method is verified by comparing the simulation and experimental results with those of the conventional methods. It is concluded from the results that the proposed algorithm can reduce the output current harmonics and the number of inverter switchings.
Analog-to-digital converter based on RSFQ technology for radio astronomy applications

We are developing an analog-to-digital converter (ADC) based on rapid single-flux quantum technology for radio-astronomic spectroscopy applications where very wide bandwidth is required and relatively small resolution is sufficient. The ADC consists of periodic-flash comparators, a demultiplexer and output drivers; and is sufficiently simple to be implemented on a single chip using a conventional 2? 3 ? m Nb trilayer technology. A 2-bit ADC has been designed for operation at 16 GHz of the sampling frequency. All the subsystems of the ADC have been fabricated using standard 1.6 kA cm? 2 Nb/AlOx/Nb technology and have been successfully tested.
Sensitivity and Reliability of Local Dynamic Stability: Effects of Age and Altered Sensory Conditions

Local dynamic stability was investigated during quiet upright stance with respect to age and altered sensory conditions. From center of pressure (COP) trajectories, the largest Lyapunov exponent (Λmax) was extracted to directly parameterize local dynamic stability, and the reliability of Λmax was assessed using the intra-class correlation coefficient (ICC). Thirty two participants volunteered for upright quiet stance trials. Vision and somatosenstaion were experimentally altered: vision was modified by eye closure, and somatosensation by using both a hard surface (HS) and a soft surface (SS). Age and vision had main effects on Λma, and the age x vision and vision x surface interaction effects were also significant. In general, older participants were less stable (i.e., higher Λmax) than younger, and altered sensory information resulted in a decrease in stability. Reliability was higher for older versus younger participants. Use of Λmax enabled a direct assessment of age-related differences in local dynamic stability and effects of altered sensory conditions. Such non-linear measures can provide additional information to that available from traditional COP-based analyses.
Relationship between Stress-Coping and Personality in Patients with Bipolar and Depressive Disorders

Background: Personality might be one of the important factors related to stress-coping in mood disorders. This study aimed to investigate the relationship between personality and stress-coping strategies in patients with bipolar and depressive disorders. Methods: A total of 195 patients diagnosed with bipolar and depressive disorders according to the criteria mentioned in Diagnostic and Statistical Manual of Mental disorders’ 5th edition were included. Pearson’s correlation and multiple regression analyses were used to analyze the relationship between personality, measured by Temperament and Character Inventory and NEO-Five Factor Inventory, and coping strategies, measured by Coping Inventory for Stressful Situations. Results: Self-directedness was reported to be positively associated with task-oriented coping in bipolar disorders, and harm avoidance was negatively associated with task-oriented coping in depressive disorders. Beck Depression Inventory score, neuroticism, and extroversion were found to be positively associated with emotion-oriented coping in bipolar disorders, and neuroticism was positively associated with emotion-oriented coping in depressive disorders. Extroversion was reported to be positively associated with avoidance-oriented coping in bipolar disorders, and extroversion, novelty seeking, and reward dependence were positively associated with avoidance-oriented coping in depressive disorders. Conclusion: This study concluded that the relationship between personality and stress-coping strategies may vary based on the type of mood disorder that is diagnosed. The interaction between personality and stress-coping might be considered for the modification of coping strategies in mood disorders.
Microprocessor based interface unit for coupling a picosecond laser oscillator with external laser amplifiers

A microprocessor based interface unit for coupling a commercial picosecond Nd:YLF laser oscillator amplifier to external high power Nd:phosphate glass laser amplifier stages is described. The system generates charging and firing signals required for the picosecond oscillator, and also carries out the charging and firing sequence of external amplifiers for a single shot or a repetitive mode of operation. The electronics developed is simple and modular, with sufficient scope for expansion of the system, and resistant to electromagnetic interference.
LACTANCIA MATERNA

En la actualidad existe un importante cuerpo de evidencia que sostiene que diferentes factores nutricionales y metabólicos, que actúan en períodos sensibles y limitados del desarrollo humano temprano, tienen efectos “programadores” de la salud, el bienestar y el rendimiento a largo plazo que se extienden hasta la adultez y la edad mayor.
Dilution of Position Calculation for Accuracy Improvement in Wireless Location Systems

Geometric dilution of precision (GDOP) represents the geometric effect on the relationship between measurement error and positioning determination error. In the calculation of GDOP value, the maximum volume method does not guarantee the optimal selection of the four measurement units. The conventional method for calculating GDOP is to use matrix inversion to all subsets. In this paper, we employ GDOP using the matrix inversion method to select appropriate base stations (BSs) in cellular communication systems. The proposed BS selection criterion performs better than the random subsets of four or five BSs chosen from all seven BSs. The performances of MS location strongly depend on the relative position of the MS and BSs. Therefore, it is very important to select a subset with the most appropriate BSs rapidly and reasonably before positioning.
Research and Design of Distributed IoT Water Environment Monitoring System Based on LoRa

In order to solve the problems of high labor cost, long detection period, and low degree of information in current water environment monitoring, this paper proposes a lake water environment monitoring system based on LoRa and Internet of Things technology. The system realizes remote collection, data storage, dynamic monitoring, and pollution alarm for the distributed deployment of multisensor node information (water temperature, pH, turbidity, conductivity, and other water quality parameters). Moreover, the system uses STM32L151C8T6 microprocessor and multiple types of water quality sensors to collect water quality parameters in real time, and the data is packaged and sent to the LoRa gateway remotely by LoRa technology. Then, the gateway completes the bridging of LoRa link to IP link and forwards the water quality information to the Alibaba Cloud server. Finally, end users can realize the water quality control of monitored water area by monitoring management platform. The experimental results show that the system has a good performance in terms of real-time data acquisition accuracy, data transmission reliability, and pollution alarm success rate. The average relative errors of water temperature, pH, turbidity, and conductivity are 0.31%, 0.28%, 3.96%, and 0.71%, respectively. In addition, the signal reception strength of the system within 2 km is better than -81 dBm, and the average packet loss rate is only 94%. In short, the system’s high accuracy, high reliability, and long distance characteristics meet the needs of large area water quality monitoring.
Fuzzy help in mobile robot navigation

To control the motion of a mobile robot in a partially-known environment, a hybrid method is used to fully utilize the advantages of both global and local strategies. The pre-acquired knowledge of the environment is memorized. It is useful for generating a global route and also for comparison between the real scene and the memorized one. If the sensors data in both scenes are the same, the navigation is then carried out at high speed with the assistance of a local fuzzy controller. If not, the robot is in a locally unknown environment. Then a reactive method, based completely on sensors information, such as the potential fields, is applied to navigate at low velocity. Due to the fuzzy logic, a module based on the human decision abilities is built to incorporate uncertainties on sensors data. It permits on one hand to switch between these two strategies and on the other hand to give the setpoint of robot's forward speed. The latter is modulated as a function of the output value of this module.
Bistable Buckled Beam: Modeling of Actuating Force and Experimental Validations

Compliant bistable mechanisms are a class of mechanical systems that benefit from broth compliance, allowing easy manufacturing on a small scale, and bistability, which provides two passive and stable positions. These properties make them first-class candidates not only for microswitches but also several other robotic appliances. This paper investgates the actuation of a simple bistable mechanism, the bistable buckled beam. It is pointed out that the position of the actuation has a significant impact on the behavior of the system. A new model is proposed and discussed, with experimental validations to compare central and offset loading, highlighting the strengths of each.
Pipe response in a geocell-reinforced trench and compaction considerations

ABSTRACT: Heavy traffic loading can produce loss of functionality in pipeline networks, with consequential interference with economic and social impacts in the areas involved in breakage. The consequences of breakage or disconnection of pipelines are technical, economic and social. In the case of a sewer network failure, illness and epidemics might result. In this paper, to protect the buried pipe, use of a three-dimensional geosynthetic (geocell) is investigated to reinforce the trench. Two series of three-dimensional full-scale tests under repeated loadings have been performed. The first test programme compares the performance of buried pipes installed beneath soil that is unreinforced, planar reinforced, or with geocell in a trench. Compaction difficulties necessitated a change in the process of compaction so that a second installation was proposed. In this series of tests, further understanding of the behaviour of geocells with different opening areas and heights above the buried pipes under repeated .
Self-aligning flip-chip assembly using eutectic gold/tin solder in different atmospheres

New applications in the field of optoelectronic packaging as well as environmental concerns lead to a growing interest in fluxless assembly processes. Eutectic gold/tin solder offers the possibility of fluxless flip chip soldering on various substrate materials and substrate metallizations. It has been shown that gold/tin solder is applicable for flip chip assembly by different techniques. Using the self-alignment mechanism of the solder, cost effective flip chip assembly with high accuracy can be realized, as the process requires only coarse positioning prior to the soldering. The scope of this paper is to investigate the self-alignment capability of gold/tin solder for fluxless soldering processes in different atmospheres. During the soldering, the atmosphere determines the thickness of the oxide layer which inhibits the wetting of the pads and therefore the self-alignment. In this study, the impact of inert and reducing atmospheres on the self-alignment capability is investigated. The experiments are performed in nitrogen, active atmosphere and hydrogen. Vernier patterns on chips and substrates allow the quantification of the positioning accuracy. Comparing the results, a conclusion about the optimum atmosphere for self-aligning flip chip assembly can be drawn. As an example, the application of the choice process is shown for optoelectronic devices.
Nanomeasuring and nanopositioning engineering

The paper describes traceable nanometrology based on a nanopositioning machine with integrated nanoprobes. The operation of a high-precision long range three-dimensional nanopositioning and nanomeasuring machine (NPM-Machine) having a resolution of 0,1 nm over the positioning and measuring range of 25 mm x 25 mm x 5 mm is explained. An Abbe offset-free design of three miniature plan mirror interferometers and applying a new concept for compensating systematic errors resulting from mechanical guide systems provide very small uncertainties of measurement. The NPM-Machine has been developed by the Institute of Process Measurement and Sensor Technology of the Technische Universitaet Ilmenau and manufactured by the SIOS Messtechnik GmbH Ilmenau. The machines are operating successfully in several German and foreign research institutes including the Physikalisch-Technische Bundesanstalt (PTB), Germany. The integration of several, optical and tactile probe systems and nanotools makes the NPM-Machine suitable for various tasks, such as large-area scanning probe microscopy, mask and wafer inspection, nanostructuring, biotechnology and genetic engineering as well as measuring mechanical precision workpieces, precision treatment and for engineering new material. Various developed probe systems have been integrated into the NPM-Machine. The measurement results of a focus sensor, metrological AFM, white light sensor, tactile stylus probe and of a 3D-micro-touch-probe are presented. Single beam-, double beam- and triple beam interferometers built in the NPM-Machine for six degrees of freedom measurements are described.
RAISING THE VOICE: EXPLORING ANTECEDENTS OF VOICE-ACTIVATED ASSISTANT USAGE INTENTION

Voice-activated assistants have become popular devices for a hands-free interaction with information systems. Despite a growing body of research, comprehensive models on usage intention especially in a commercial context have been under-researched. This research in progress explores antecedents of attitude and usage intention of voice-activated assistants through multiple theoretical lenses, including the Technology Acceptance Model, the Unified Theory of Acceptance and Use of Technology, Social Exchange Theory, and privacy concerns. The result is a conceptual framework consisting of six propositions on the impact of perceived usefulness, perceived ease of use, social influence, trust, and privacy concerns on attitude towards voice-activated assistants and their usage intention.
Potential of the distributed amplifier as a photo-diode detector amplifier in high bit rate optical communication systems

The theoretical performance of the common source MESFET amplifier and distributed amplifier as a post photodetector amplifier for use in high bit rate optical communication systems are compared. The calculations suggest that a 7dB improvement in the noise level may be obtained from the distributed amplifier in this situation in comparison with the conventional common source amplifier.
Acquisition Community Team Dynamics: The Tuckman Model vs. the DAU Model

Abstract : The Tuckman (1965) four-stage sequential model of team development (Forming, Storming, Norming, and Performing, or FSNP) represents today's most widely used model. However, the Tuckman model is a conceptual statement that was suggested by the data and has not been empirically validated. Hadyn, Teare, Scheuing, and Armistead (1997) state that "despite increasing interest in teamwork, much of the literature on the subject is inconclusive and often derived from anecdote rather than primary research. " The goal of this research was to develop empirical evidence to determine whether or not the Tuckman model or some variant thereof provides an appropriate model to explain the development of small, short-duration technical teams within the Acquisition Community. The results showed, to a 95% confidence level, that only about 2% of 321 teams studied followed the Tuckman mode (FSNP). However, a modified model, called the DAU Model (FNP -- Tuckman model sans Storming), was experienced by 229 of the 321 teams (77%). This discrete three-stage model, along with a redefined Storming function that takes place throughout the teams' duration, constitutes a strong model of team dynamics for the studied Acquisition population. This research demonstrates that not only do technical teams generally follow the DAU model, but also that there is a strong correlation between teams producing above-average products and teams following this model. The results of this research strongly suggest the possibility that the productivity of a technical team may be significantly improved by guiding its development through a well-defined process. The paper includes 27 briefing charts that summarize the presentation.
Factors affecting Orientation and Satisfaction of Women Entrepreneurs in Rural India

In the present era, the women-owned businesses in the form of women entrepreneurs are one of the fastest growing entrepreneurial populations in the India. The objective of the paper is to study the factors that affect women entrepreneurial orientation and their satisfaction. In this regard, the paper explores the affecting variables and their impact on orientation and satisfaction. The proposed model and hypotheses were tested by using the data collected from boutiques, beauty parlors, carpet making units, and general stores in Jammu and Kashmir (India). Univariate, bi-variate, and multi-variate techniques were used for data analysis. In SEM, 13 paths were created for evaluating the cause and effect relationship between different factors viz., social, psychological, financial, push, pull factors, problems, and entrepreneurial orientation and satisfaction. Out of 13 paths eight relationships are significant while five relationships are insignificant in this structural equation. The key finding of the paper is that all factors affect orientation highly as compared to satisfaction. The implications of research findings for researchers and practitioners are discussed and the suggestions have also been provided. Keywords: women entrepreneurship; entrepreneurial orientation; satisfaction; rural India; psychological factors (Published: 12 July 2011) Citation: Annals of Innovation & Entrepreneurship 2011, 2 : 5813 - DOI: 10.3402/aie.v2i1. 5813
Digital simulation of EHV systems under secondary arcing conditions associated with single-pole autoreclosure

The effectiveness of single-pole autoreclosure (SPAR) in maintaining power-system stability is largely determined by the speed with which secondary arc extinction, and hence autoreclosure, can be achieved. Realistic simulation techniques are of obvious importance in relation to the design of systems employing SPAR and, in the paper, digital methods are developed to enable the faulted response of EHV feeders, subjected to secondary arcing phenomena, to be more realistically simulated than has hitherto been possible. The new techniques are also of importance in relation to programmable based protection test equipment. Based upon experimental data, methods of modelling the nonlinear behaviour of the earth-fault arc path, in both conducting and extinction states, are described; together with the techniques developed for incorporating such models into practical EHV system interconnections. The paper concludes by illustrating and discussing the results of a computational study relating to a typical short 500 kV feeder employing SPAR.
Atrium Hot Smoke Tests in a Big Shopping Complex

Hot smoke tests were carried out in the site of four atriums of heights over 32 m in a big shopping complex. The objective was to evaluate the performance of the mechanical smoke exhaust systems installed. This is required while inspecting the fire service installations as specified in the local codes. Testing procedures followed those in Australian Standard with slight modifications. A 2 MW methanol pool fire was agreed in the tests. It was set up with six trays in a test chamber for reducing the radiation effect to adjacent combustibles. The main testing criterion is to demonstrate that the smoke layer can be kept above 8 m upon operating the smoke exhaust system. Other testing criteria listed in the code such as that on roof air temperature were also assessed. Elevation of the smoke layer interface was observed visually through indication marks placed at height 8 m above the floor. Vertical temperature profile was also measured by a thermocouple tree placed a distance away from the fire source. Results of the hot smoke tests confirmed that operating the mechanical smoke exhaust system installed in the four atriums would keep space below 8 m free of smoke. Language: en
High power low RIN Brillouin fiber laser with optoelectronic oscillator configuration

We demonstrate the high power low RIN Brillouin fiber laser source with stimulated Brillouin scattering. Brillouin fiber laser and high quality RF are generated simultaneously in Brillouin optoelectronic oscillator. Brillouin fiber laser with 104mW power and -154dB/Hz RIN is generated. RIN of Brillouin fiber laser is 8dB lower than RIN of EDFA-amplified DFB.
Experimental Study of Water Heating Efficiency between Aluminium and Copper Absorber Plate in Solar Flat Plate Collector

Solar water heating using flat plate collector (FPC) is the widest application that had been used in residential and commercial area. The material for the absorber plate in FPC should have good thermal conductivity to ensure a high value for the heat removal yet able to store heat slightly high during minimum solar radiation period. An experimental of FPC water heating is conducted using copper and aluminium as absorber plate. The plates were exposed under intense sun radiation more than 800w/m2. The analysis is performed on the relationship between the material and the temperature difference of water. The results represented the heat gain and water heating efficiency between aluminium and copper. Aluminium had heat gain of 1100.69W. Copper had the heat gain of 1025.36W. The water heating efficiency calculated for aluminum is 0.97 while copper is 0.93. The paper finally justified that aluminium is better as the absorber plate in this flat plate solar collector compare to copper plate.