Miracle-dz/UniFAR-FTUs huggingface dataset:
A Wideband Fabry-Pérot Antenna With Enhanced Gain in the High-Frequency Operating Band by Adopting a Truncated Field Correcting Structure

A novel method to enhance the high-frequency gain of a wideband Fabry–Pérot (FP) antenna by using a truncated field correcting structure (TFCS) is proposed. The TFCS is formed by laminated dual-layer dielectric substrates and acts as the high-frequency operating band phase and amplitude correcting structure of the FP antenna for the radiated field. This method not only has a small effect on the operating bandwidth of the antenna, but also has a positive effect on improving the gain over the low-frequency operating band. The simulation and experimental results verify that the TFCS can effectively enhance the gain within the high-frequency operating band, and expand the 3 dB gain bandwidth of the FP antenna. The measured results show that the proposed antenna has a 10 dB return loss bandwidth of 8.49–12.34 GHz (37.0%), a 3 dB gain bandwidth of 8.48–11.82 GHz (32.9%), and a maximum gain of 17.73 dBi. The 3 dB gain bandwidth of the FP antenna is extended from 28.8% to 32.9% after loading with the TFCS, and the maximum gain enhancement within the high-frequency operating band is increased by 3.48 dB at 11.58 GHz.
Construction of Optical Topological Cavities Using Photonic Crystals

A novel design of the Fabry–Pérot optical cavity is proposed, utilizing both the topological interface state structures and photonic bandgap materials with a controllable reflection phase. A one-to-one correspondence between the traditional Fabry–Pérot cavity and optical topological cavity is found, while the tunable reflection phase of the photonic crystal mirrors provides an extra degree of freedom on cavity mode selection. The relationship between the Zak phase and photonic bandgap provides theoretical guidance to the manipulation of the reflection phase of photonic crystals. The dispersions of interface states with different topology origins are explored. Linear interfacial dispersion emerging in photonic crystals with the valley–spin Hall effect leads to an extra n = 0 cavity mode compared to the Zak phase–induced deterministic interface states with quadratic dispersion. The frequency of the n = 0 cavity mode is not affected by the cavity length, whose quality factor can also be tuned by the thickness of the photonic crystal mirrors. With the recent help of topology photonics in the tuning reflection phase and dispersion relationship, we hope our results can provide more intriguing ideas to construct topological optical devices.
Communication of Parents and Early Childhood to Build Confidence in The Pandemic Covid-19

Abstract: This study uses qualitative research, with data collection methods using interviews, observation, and documentation. Data analysis techniques using the Speadley model. The data validity technique uses triangulation. This research focuses on parental communication in building self-confidence in early childhood during the co-19 pandemic. Communication is an important requirement for children, especially to increase the confidence of early childhood. Based on research in Margorejo Village, Tempel Subdistrict, from 20 samples obtained a comparison data of 69% of parents applying democratic communication patterns, 31% of parents applying permissive communication patterns, and 29% of parents applying authoritarian communication patterns. Early childhood who have high self confidence comes from parents who implement democratic communication.Komunikasi Orang Tua dan Anak Usia Dini Membangun Keyakinan di tengah Pandemi Covid-19Abstrak: Penelitian ini menggunakan penelitian kualitatif, dengan metode pengumpulan data menggunakan wawancara, observasi, dan dokumentasi. Teknik analisis data menggunakan model Speadley. Teknik keabsahan data menggunakan triangulasi. Penelitian ini berfokus pada komunikasi orang tua dalam membangun rasa percaya diri pada anak usia dini di masa pandemi covid-19. Komunikasi merupakan kebutuhan penting bagi anak, terutama untuk meningkatkan kepercayaan diri anak usia dini. Berdasarkan penelitian di Desa Margorejo Kecamatan Tempel, dari 20 sampel diperoleh data perbandingan 69% orang tua menerapkan pola komunikasi demokratis, 31% orang tua menerapkan pola komunikasi permisif, dan 29% orang tua menerapkan pola komunikasi otoriter. Anak usia dini yang memiliki rasa percaya diri yang tinggi berasal dari orang tua yang menerapkan komunikasi demokratis.
Community marathon event participation and quality of life

ABSTRACT This study examined serial multiple mediation effects to explain how participating in a recurring local sport event evolves into events support, contributes to community attachment, and affects the quality of life of residents who participated in the event. Using a web-based survey, 486 responses from marathon runners living in the hosting community were used for data analysis. Results confirmed the focal relationship between event satisfaction and resident marathon runners’ perception of their quality of life. Further analysis validated the sequential effects of participant satisfaction with the marathon event on supporting the event, developing community attachment, and improving quality of life. The findings suggest that hosting a recurring sport event presents a great opportunity for event organizers to enhance residents’ quality of life. Event organizers should maintain the performance of the recurring event to satisfy event participants and may develop partnerships with various organizations to enhance event participants’ quality of life. HIGHLIGHTS Event satisfaction significantly affects resident quality of life. Event support of residents mediates between event satisfaction and resident quality of life. Residents who were satisfied with the event were more likely to support the event and that, in turn, led to a higher level of quality of life. Resident satisfaction with the event is positively and significantly associated with quality of life through the mediation of event support followed by community attachment.
Analyzing social media messages of public sector organizations utilizing sentiment analysis and topic modeling

In this paper, we perform sentiment analysis and topic modeling on Twitter and Facebook posts of nine public sector organizations operating in Northeast US. The study objective is to compare and contrast message sentiment, content and topics of discussion on social media. We discover that sentiment and frequency of messages on social media is indeed affected by nature of organization’s operations. We also discover that organizations either use Twitter for broadcasting or one-to-one communication with public. Finally we found discussion topics of organizations – identified through unsupervised machine learning – that engaged in similar areas of public service having similar topics and keywords in their public messages. Our analysis also indicates missed opportunities by these organizations when communication with public. Findings from this study can be used by public sector entities to understand and improve their social media engagement with citizens.
Management Decision and Dual Innovation

China’s economic development is strongly constrained by existing resources, and the implementation of low-carbon economy and sustainable development requires enterprises to improve their Innovation and R&D capability. As an important participant in the decision-making and execution of the company, the managerial discretion of top managers is related to the overall direction of the organization Taking Shanghai and Shenzhen A-share listed companies from 2009 to 2020 as the research objects, this paper empirically studies the choice of managerial discretion on enterprise innovation mode, and constructs the mediation model of corporate governance level. The results show that the promotion of executive decision-making power can increase the investment in exploratory innovation but weaken exploitative innovation, and the level of corporate governance plays a partial mediating role in the influence of managerial discretion on exploratory innovation. This paper elaborates the research on the influence of managerial discretion on enterprise innovation mode, which is helpful for enterprises to adjust the size of managerial discretion according to their actual needs, pay attention to the level of corporate governance, and make enterprises better control the choice of dual innovation.
Experimental Parameter Estimation of Induction Motor Based on Transient and Steady-State Responses in Synchronous and Rotor Reference Frames

This paper presents a method for estimating the equivalent circuit parameters of three-phase induction motors by employing the extended Kalman filter. In this method, the stator currents and voltages, and rotor speed of the motor under an unspecified load and in unsaturated condition are considered. The rotor resistance, mutual inductance, and stator leakage inductance are estimated using the synchronous reference frame in the steady-state mode. Also, the rotor leakage inductance is estimated using the rotor reference frame in the transient mode. Experimental data are used to validate the analytical technique.
Switched-Capacitor Bandgap Voltage Reference for IoT Applications

This paper presents a switched-capacitor network (SCN) based bandgap voltage reference (BGR) for IoT applications. The proposed BGR employs a dual proportional-to-absolute-temperature (PTAT) clock topology to achieve both high precision and low power over a wide temperature range while relaxing the capacitor size requirements. Specifically, the fast PTAT clock assists in reducing the output voltage ripple of the dual-branch interleaved <inline-formula> <tex-math notation="LaTeX">$2\times $ </tex-math></inline-formula> charge pump (CP). Meanwhile, the slow PTAT clock controls the voltage divider SCN to relax the settling error at low temperature and the leakage-induced error at high temperature simultaneously, resulting in lower power consumption and smaller temperature coefficient (TC). We also propose a replica <inline-formula> <tex-math notation="LaTeX">$V_{\mathrm {EB}}$ </tex-math></inline-formula> generation branch in the series-parallel SCN to improve the BGR output TC due to the finite settling time during switching. Fabricated in 65nm standard CMOS, measurement results show that the proposed BGR obtains a TC of 32 ppm/°C at 0.5V supply within −40 °C to 120 °C. The line regulation is 3.3mV/V or 0.66%/V from 0.5V to 1V. Based on 10-chip measurement results, we obtain a <inline-formula> <tex-math notation="LaTeX">$3\sigma / \mu $ </tex-math></inline-formula> variation of 1.37% before trimming, while 0.25% after applying one-point trimming at 20°C.
Low Vibrations and Improved NVH in Permanent Magnet Synchronous Machines Due to Injection of Flux-Linkage Harmonics

Harmonic currents have a significant influence on the vibration behavior of electrical machines. Nevertheless, it remains a challenge to determine the optimum amplitude and phase position of the harmonic currents. This article concentrates on the injection of flux-linkage harmonics to enable acoustic optimization for permanent magnet synchronous machines (PMSMs). The test bench verification of this method using a commercial drive from a luxury class hybrid car proves that vibrations of the problematic mode zero are almost completely eliminated. The total sound pressure level of the machine is reduced by approximately 10 dB compared to the usual field-oriented control. Besides the advantage on the acoustic behavior, this article evaluates the impact of the harmonic flux-linkage injection on current amplitude, average torque, and efficiency.
The experimental investigation of the HPAM/phenolic resin deep profile system in fractured low-permeability reservoirs

The problem of injected water channeling along fractures exists in the process of water injection in fractured low permeability reservoir, aimed at this problem, deep profile control technology applies to plug fractures to improve the recovery of low permeability reservoir. In this paper, partially hydrolyzed polyacrylamide (HPAM) is used as water-plugging/profile-modifying agent and phenolic resin as crosslinker agent. Several profile control systems are tested to find the one which is suitable for fractured low permeability reservoirs. The performances of profile control systems are evaluated, and effects of formation water salinity, that of shearing rate and that of temperature on the performance are studied. Finally, in order to study effects of this profile control system on displacing oil, flowability experiment and core displacement experiment are applied. It shows that with the increase of salinty of prepared water and the increase of the shearing rate, the viscosity of this system decreases. With the increase of temperature, the gelling time shortens, the viscosity increases, but the stability weekens. This kind of profile control system has a good effect on plugging fractures of low permeability cores. After water flooding, this kind of profile control system is injected into cores, the recovery ratio can increase 3.5%. So the profile control system composed of HPAM/ phenolic resin can apply to deep profile control in fractured low permeability reservoir to enhance oil recovery.
1/f² Phase Noise Analysis in Active-Coupling LC-Tank Oscillators With Frequency Mismatch

Multi-core LC-tank oscillators have attracted a great deal of attention since their capability to achieve ultra-low phase noise in a scalable and power-efficient way. This brief presents a study of 1/f2 phase noise in active-coupling oscillators. A complete frequency domain analysis is proposed to describe the steady-state oscillators amplitude and phase. Closed-form formulas are derived for phase noise degradation caused by resonance frequency mismatches between the LC-tanks. The theoretical analysis is first validated through extensive simulations and then exploited to compare the robustness to LC-tank frequency mismatches in active- and resistive-coupling oscillators, proving the superior performance of the latter.
Analysis of the Unsymmetrical Operation of the DC/DC MMC Considering the DC-Link Impedance

This paper analyzes the unsymmetrical operation of the dc/dc MMC caused by parametric uncertainty. The unsymmetrical operation is referred to as the condition in which parameters involved in ac power generation are not equal in the phase-legs of the converter. Because existing models in the literature cannot exhibit the unsymmetrical operation of the dc/dc MMC, new detailed and simplified steady-state models are developed in this paper. In the developed models, the connection between the operation of different phase-legs shows itself when the dc-link impedance is considered. Using the developed models, the parameters that can force the converter to operate in unsymmetrical conditions are identified, and the maximum variation that the converter can tolerate is found. It is shown that even a small parameter variation leads to the leakage of the ac circulating current into the dc-link, which is not acceptable. By conducting various case studies, the impacts of the dc-link length, the transmitted power, and the conversion ratio on the unsymmetrical operation of the dc/dc MMC are characterized. The results showed that the converter would be more sensitive to the parameter variation as these parameters increase. Comparative analysis and simulation results confirm the validity and effectiveness of the presented models and analysis method.
Analysis and numerical simulation of a waterspout at the Hong Kong International Airport

The wind ﬁeld of a waterspout that occurred near the Hong Kong International Airport was documented using dual-Doppler analysis from a dense network of Doppler Light Detection and Ranging (LIDAR) systems operated at the airport, and nearby surface weather station observations. The dual-Doppler winds are used in tandem with surface observations to analyze the wind structure of the waterspout. The performance of a numerical weather prediction system simulating the windshift line and the associated vortices is compared to the observations. The waterspout and the other vortices formed along a windshift line (convergence between the arriving northeast monsoon and background westerly/sea breeze) and were rather weak, with the surface wind gusting to about 10 m/s. However, the dense network of meteorological sensors at the airport provided unprecedented surface sampling of these vortices. The numerical model captured the convergence line and the vortices reasonably well and may provide earlier alerting to the aviation weather forecasters about the possible occurrence of small waterspout-type vortices near the airport, which may have implications to aviation safety.
Feasibility evaluation of new electric motors driven by intrinsic localized mode

: Intrinsic localized mode (ILM) has been observed in various physical systems. In particular, electromagnetic ILM has been observed on an LC ladder circuit array. This paper focused on the electromagnetic ILM and aims to evaluate the feasibility of a new electric motor driven by the electromagnetic ILM numerically. First, we propose two types of nonlinear inductors with diﬀerent geometries, and their magnetic saturation characteristics are clariﬁed from the magnetic ﬁeld analysis. Second, numerical simulations using the obtained parameters show that the moving velocity of a moving ILM varies with an initial voltage disturbance. Finally, we propose an inductor with permanent magnets placed on a surface of a rotor core, aiming to generate the electromagnetic ILM more eﬃciently. Numerical simulations show that the behavior of the moving ILM is aﬀected by the rotational speed of the rotor.
Impact of a Monthly 3-Month Preventive Exercise Program on the Quality of Life, Ikigai (meaning for life) and Positive Attitudes of Older Women with Different Levels of Life Purpose

: [Purpose] The purpose of this study was to clarify the effects of a monthly 3-month care prevention exercise program on quality of life (QOL), ikigai (meaning for life) and positive attitudes of elderly women, and to clarify the effects of exercise habit and high or low life purpose on QOL, ikigai and positive attitudes. [Participants and Methods] The purpose of life, quality of life, purpose in life, and positive attitude were investigated in 16 elderly women aged 65 years or older living in X city in the Kansai region. [Results] Before and after the program, all the values of the purpose of life, mental component summary, ikigai and positive attitude increased, but there were no significant differences. On the other hand, a group comparison of the values before and after the program showed significant differences in the mental component summary, ikigai and positive attitude before the program, and a significant difference only in ikigai after the program. [Conclusion] We speculate that having a high purpose in life is related to the mental component summary, ikigai and positive attitude, which provides an important suggestion when conducting care prevention for the elderly.
Two-Way Refinement Approach For Extra Corrupted Shard Removal In Elastic Search With Lucene And Translog

Elasticsearch is most popular search engine which is based on Apache Lucene. Many advantages are identified with the Elasticsearch. For every inserted document or record the Elasticsearch’s auto-generated id values are created. But this may leads to increasing the duplicate values. To overcome this various duplicate methods are introduced by various researchers. Indexing is very important for the elastic search removing duplicates in elastic is based on indexing. For this Lucene Index and Translog are used. This can be used for all types of data in Elastic search. Many researchers working on removing duplicates and shards from the data. But still there is lot of corrupted shards is present in output. To overcome this, A Two way Refining Algorithm (TWRA) is introduced to remove the extra corrupted shards for extra refinement of data. The TWRA consists of two refinements of data such as Advanced Advanced Data Cleaning and Advanced Data Filtering Algorithm. Experimental results show the performance of the proposed methodology.
The effect of combined AC electric field and ultrasound on the chemical compositions and Escherichia coli content of spearmint aromatic water

The aromatic waters are one of the forms of the use of medicinal plants, mostly for edible or medicinal uses. They are required to control the microbial load. Common methods of pasteurization by reason of applying high temperatures cause the undesirable changes in taste, odor, medicinal properties, nutritional quality, and reduction in essential oil. Therefore, novel methods of pasteurization have been widely used recently. In order to determine the microbial inactivation by pulsed electric field and ultrasound, Escherichia coli at a concentration of 7 × 106/mL was inoculated to spearmint aromatic water. The field intensities of 5, 7.5, and 10 kV/cm with time durations of 5, 20, and 35 s and ultrasound powers of 100, 150, and 200 W with time durations of 3, 4, and 5 min were applied. The data obtained from the experiments were analyzed using response surface methods. The results showed that the effect of the four variables listed on the inactivation of microorganisms and energy consumption per cycle of microbial reduction are significant. At the end, the process was optimized. The optimum values for the electric field intensity, time of applying the field, the ultrasound power, and sonication time were 10 kV/cm, 35 μs, 185.90 W, and 4.47 min, respectively. It should be noted that the proposed method had minimal changes in the chemical composition of the raw spearmint aromatic water and was superior to conventional heating methods. Practical applications: The mint aromatic water is used in food, pharmaceutical, and personal care industries; it is necessary to microbiological control of its content. Because of conventional pasteurization methods cause undesirable changes in taste, smell, and nutritional quality with a reduction in the amount of essential oil. For this purpose, researchers are looking for solutions that by combining new thermal and nonthermal approaches, the damaging effects of conventional pasteurization be removed. However, the main challenge facing the nonthermal technologies in food processing is the inactivation of pathogenic microorganisms and food spoilage agents, which can be achieved by various methods. The aim of the present research was examined the simultaneous effect of the ultrasonic and the electric field to remove microorganism and save quality and benefit chemical compositions of medicinal aromatic water. This research introduces an innovative and combined method for aromatic water pasteurization and this method can benefit to the food industry. © 2017 Wiley Periodicals, Inc.