Miracle-dz/UniFAR-FTUs huggingface dataset:
Analysis of integration flow control valve and electronic load controller for micro hydro power plant frequency regulation

Frequency regulation is very important for microhydro power system. Flow control valve (FCV) and electronic load controller (ELC) are common control systems developed for micro hydro power plant (MHPP) with synchronous generator. However, these control systems each other has a drawback in term of frequency response or harmonics issues. This paper proposes an integrate control system, in which FCV and ELC system work together for MHPP in order to obtain a better performance in frequency response and total harmonic distortion (THD). PID and PI controllers were used for FCV and ELC, respectively. The integrated control method influences on the MHPP performance was verified by MATLAB simulation, when the load reduced 10KW in two sequences time. Results of the simulation confirm that the integration of FCV and ELC offered a better trade-off between frequency response and THD issues for MHPP, which cannot be solved by standalone FCV or ELC. By integrating both control systems, they gave the best values for frequency response and THD in around 1.4071 second and 8.57%, respectively.
Structure parameters of galactic globular clusters

Observed and derived structure parameters are tabulated for 154 galactic globular clusters, 7 dwarf spheroidal satellites of the Galaxy, and 6 globular clusters in the Fornax dwarf spheroidal. Ob­ servational parameters listed include equatorial coordinates, apparent level of the horizontal branch, reddening, subgiant branch color at the horizontal branch level, limiting and core angular radii, inte­ grated magnitudes, and central surface brightnesses. Derived parame­ ters include galactic coordinates, heliocentric and galactocentric distance, metallic! ty, limiting and core radii, central relaxation time scale, central mass density, central velocity dispersion, and central escape velocity.
Modeling and Observer-Based Vibration Control of a Flexible Spacecraft With External Disturbances

This paper outlines the vibration reduction of a spacecraft with flexible appendage subject to external disturbances. The hybrid dynamic model of the spacecraft is described by both partial differential equations and ordinary differential equations. A vibration control scheme consisting of two boundary control laws and a distributed control law is developed to restrain the spacecraft's vibration and track the desired attitude. An infinite-dimensional disturbance observer is introduced as a feedforward compensator to handle unknown external disturbances. Based on the semigroup theory, the extended LaSalle's invariance principle and Lyapunov analysis, the well-posedness and stabilities of the designed control system are both discussed. Simulation results are given for validating the effectiveness of the developed vibration control scheme.
Multipartite Continuous Variable Quantum Conferencing Network with Entanglement in the Middle

We suggest a continuous variable quantum conferencing network scheme with an entangled source in the middle. Here, the source generates a multipartite entangled state and distributes the modes of the state to an arbitrary number of legitimate network users. The entangled modes that were received and measured by the users share mutual information, which is utilized to generate secure conferencing key between users. The scheme is proven secure against collective attacks on both the untrusted source in the middle and all the quantum links. Simulation results show that the presented scheme can achieve high rate secure conferencing for 100 users within a 400 m-radius community or factory area.
Energy-Based Nonlinear Adaptive Control Design for the Quadrotor UAV System With a Suspended Payload

In this paper, the control problem for an underactuated quadrotor unmanned aerial vehicle (UAV) with a suspended payload is investigated. An energy-based nonlinear controller is proposed that is able to control the quadrotor UAV's position and the payload's swing angle asymptotically. An adaptive control design is developed to compensate for the unknown length of the cable which is used to connect the UAV and the payload. The Lyapunov-based stability analysis is employed together to prove the stability of the closed-loop system. Detailed real-time experimental results illustrate the good performance of the proposed controller.
Fusing Deep Learning and Sparse Coding for SAR ATR

We propose a multimodal and multidiscipline data fusion strategy appropriate for automatic target recognition (ATR) on synthetic aperture radar imagery. Our architecture fuses a proposed clustered version of the AlexNet convolutional neural network with sparse coding theory that is extended to facilitate an adaptive elastic net optimization concept. Evaluation on the MSTAR dataset yields the highest ATR performance reported yet, which is 99.33% and 99.86% for the three- and ten-class problems, respectively.
Monte Carlo simulation of extracellular diffusion in brain tissues

Computer simulations based on the Monte Carlo method were carried out in order to test the validity of the technique of diffusion simulation in the extracellular space of brain tissue. The Monte Carlo simulation of extracellular diffusion within a binary image of a histological preparation satisfied experimental observations if the tissue was considered to be porous and isotropic. Therefore, this simulation technique may be helpful in studying diffusion in such tissues, especially in cases where experimental data are difficult to obtain.
Synthetic optical and ultraviolet spectra of stationary accretion disks

On presente les spectres synthetiques de raies et du continuum des disques d'accretion des variables cataclysmiques dans les domaines du visible et de l'ultraviolet. On se limite dans les calculs sur ordinateur aux disques optiquement epais stationnaires et geometriquement minces
Electronically Steerable Circularly Polarized Planar Antenna

This paper presents a steerable, circularly polarized planar antenna operating at 2.45 GHz. The design employs a central omni-directional circularly polarized active element surrounded by electronically controllable parasitic elements that are used to steer the beam in the desired direction. The proposed antenna is capable of steering the beam in an arbitrary direction. The antenna has a 3 dB gain and an axial ratio of less than 2 dB in the direction of radiation.
A Novel Boost Active Bridge-Based Inductive Power Transfer System

In recent years, a number of bidirectional inductive power transfer systems (BD-IPT) suitable for wireless grid integration of electric vehicles have been developed. These developments have been fueled by the enhanced efficiency and spatial tolerance offered by BD-IPT systems. A typical BD-IPT system utilizes two synchronized full-bridge converters operating at fixed duty cycles to drive the primary and secondary magnetic couplers. However, in order to cater for a wide range of loading conditions, additional circuitry is employed at the expense of cost and power density. As an alternative solution, this paper proposes a novel power converter, named a boost active bridge (BAB), to replace the full-bridge converters. The BAB topology caters to a wide range of loading conditions without the need for any extra switching devices. A comprehensive mathematical model that predicts steady-state currents, voltages, and power transfer is presented to highlight the operating principles of the BAB technology. Experimental results obtained from a 3.5-kW prototype show a nearly constant efficiency under all loading conditions, validating the viability of the proposed BAB topology.
Characterization of the squeeze film damping effect on the quality factor of a microbeam resonator

The squeeze film damping effect on a beam resonator is analyzed on the basis of the coupled elastic beam theory and the Reynolds equation for isothermal incompressible gas films. Under the condition of small amplitude oscillation, linearization of the governing equations leads to the solution that characterizes the squeeze film damping effect on the beam resonator by two dimensionless parameters. These two parameters, in analogy with the damping and mass parameters of the simple mass-spring-damping system, are completely determined by the physical properties of the beam and gas. It is shown that the calculation of these two parameters can be considerably simplified according to the value of the squeeze number.
Interference and Spoofing Detection for GNSS Maritime Applications using Direction of Arrival and Conformal Antenna Array

An international maritime measurement campaign was done to detect and record radio frequency interferences in the Satellite Navigation frequency bands. The system, installed on a large container ship, consists of a conformal seven elements antenna array, an ad-hoc data recorder system and a multi-antenna navigation receiver prototype. In this paper, the system is briefly presented, together with the proposed detection and analysis methodology. Pertinent results of measurements are shown, including detected radio frequency interferences, its characterization, impact on the receiver performance and the localization of the ship during the time. In addition an on-line calibration scheme is used to correct channel differences, hence allowing Direction of Arrival estimation of the mentioned interferences with the conformal antenna array. Moreover, a Spoofing / Repeater data analysis has been performed over some of the recorded data.
Design Procedures for a Frequency-Scanned Traveling Wave Antenna, Part 1: Air-Filled Waveguide

Abstract : A leaky waveguide antenna is investigated through a combination of theoretical analysis and numerical simulation. We developed a design procedure based on the analysis of Goldstone and Oliner for an aperture in the narrow wall of a rectangular waveguide. We can phase scan the antenna by adjusting the propagation constant of the guiding structure, and we can frequency scan it by taking advantage of frequency dispersive behavior. A combination of frequency and phase scanning can be used to steer the beam. We describe how the aperture illumination function is synthesized for a constant width aperture and we present the design equations. We use a numerical simulation of the leaky waveguide section to obtain the radiation efficiency. We then calculate the realized gain to evaluate the frequency scan range and radiation pattern characteristics. The results demonstrate that the main beam position can be scanned in the range of 100 to 300 from broadside over a narrow frequency range without corrupting the radiation pattern.
Real-time Information, Uncertainty and Quantum Feedback Control

AbstractFeedback is the core concept in cybernetics and its effective use has made great success in but notlimited to the ﬁelds of engineering, biology, and computer s cience. When feedback is used to quantumsystems, two major types of feedback control protocols including coherent feedback control (CFC)and measurement-based feedback control (MFC) have been developed. In this paper, we compare thetwo types of quantum feedback control protocols by focusing on the real-time information used inthe feedback loop and the capability in dealing with parameter uncertainty. An equivalent relationshipis established between quantum CFC and non-selective quantum MFC in the form of operator-sumrepresentation. Using several examples of quantum feedback control, we show that quantum MFC cantheoretically achieve better performance than quantum CFC in stabilizing a quantum state and dealingwith Hamiltonian parameter uncertainty. The results enrich understanding of the relative advantagesbetween quantum MFC and quantum CFC, and can provide useful information in choosing suitablefeedback protocols for quantum systems.Index Terms
Methodology for determining the most severe risks of a construction project and identification of risky projects

DOI: 10.7764/RDLC.17. 3.423 Construction projects involve very different kinds of risks of distinct natures and demand an agile and flexible risk assessment methodology. This study has analyzed scholarly literature and best practices to find current weaknesses. Two main solutions are presented in this paper in response to the findings of the analysis: a general purpose, quantitative key risk indicator, the “Risk Visibility Factor” (Fv), that yields a single linear 0-100 value for each risk event out of its impact and likelihood; and a summarizing method based on Fv to obtain the overall risk for two or more risk events, expressed as a single equivalent risk event with its own impact and likelihood. The first solution improves current risk assessment by providing a more intuitive and understandable indicator to rate risks and projects; the second one, with recursive capability, allows risk scenarios (e.g., projects) to be seen as single risk event, without any kind of limitation on the number and nature of risks, making it easier to compare the risk severity of distinct projects. Both solutions can be used to define the risk appetite and to compare with it any risk event or scenario.
An integrated fuzzy SWARA and fuzzy AD approach for outsourcing provider selection

Purpose Unlike previous literature, this study offers a novel integrated fuzzy approach to the field of outsourcing decisions. The purpose of this paper is to use design ranges of evaluation criteria that satisfy the functional requirements (FRs) of decision makers to solve the outsourcing provider selection problem. Design/methodology/approach In this study, considering the expected significance of outsourcing evaluation criteria, and the FRs of decision makers expressed in linguistic terms, a robust multi-criteria decision-making (MCDM) tool based on the integrated use of fuzzy Step-wise Weight Assessment Ratio Analysis and weighted fuzzy axiomatic design methods is proposed for use in decision process. Findings The proposed method is applied to a Turkish chemical company. A sensitivity analysis is performed and the outcomes of the proposed integrated framework are compared with those of other MCDM methods such as fuzzy-based Technique for Order Preference by Similarity to Ideal Solution, fuzzy Vise Kriterijumska Optimizacija I Kompromisno Resenje and fuzzy Multi-Objective Optimization on the basis of Ratio Analysis. This validates the usefulness and practicality of the proposed methodology. Practical implications The main contribution of this study is that it defines specific requirements that will assist company managers in eliminating alternatives that do not satisfy the needs and expectations of their company. Originality/value This paper compares the present study with other studies in the field of manufacturing. Additionally, it provides a well-documented case study, which makes the paper of value to researchers interested in the practical applications of MCDM methods.
Harmonic propagation of finite amplitude sound beams: comparative method in pulse echo measurement of nonlinear B/A parameter

This article presents an original method of B/A measurement with a single plane transducer used in pulse-echo mode. To determine the best conditions of measurement, we use an ideal model with a new solution for the second harmonic. We take into account the phenomena of attenuation and diffraction. Experiments validate simulations in the case of comparative method measurement. Then we present a device to improve the detection of the second harmonic. Thus measurement of the B/A parameter of ethanol and glycerol validates this device and we also show the possibility of its use in nonlinear imaging with a weak excitation.
An Ultra-Low Voltage and Low-Energy Level Shifter in 28-nm UTBB-FDSOI

A low-power level shifter capable of up-converting sub-50 mV input voltages to 1 V has been implemented in a 28 nm FDSOI technology. Diode connected transistors and a single-NWELL layout strategy have been used along with poly and back-gate biasing techniques to achieve an adequate balance between the drive strength of the pull-up and pull-down networks. Measurements showed that the lowest input voltage levels, which could be upconverted by the 10 chip samples, varied from 39 mV to 52 mV. Half of the samples could upconvert from 39 mV to 1 V. The simulated energy consumption of the level shifter was 5.2 fJ for an up-conversion from 0.2 V to 1 V and 1 MHz operating frequency.
Analysis of the rotor dynamics characteristics of multi-degree-of-freedom permanent magnet synchronous motor

The spherical shell rotor is contained in the multi-degree-of-freedom permanent magnet synchronous motor. When the rated speed of motor is close to the critical speed, the motor will generate multiple resonances, which will affect the normal operation of the motor. The motor rotor must pass through the first-order critical speed and work at the safety range between 1-order and 2-order critical speed. According to the dynamic characteristics of rotor system, a mathematical model of rotor under free state is established, and the result between finite element and analytical methods is comparison. The influence of rotor gyroscope effect on critical speed is analyzed, and the finite element analysis of whether the rigidity of rotor material affects the critical speed is also carried out. The relationship between bending modal and deformation displacement is tested under different rigidity conditions and the stator deformation caused by rotor rotation is analyzed when the stator is filled with different liquids. The relationship between the rotational speed and the amplitude of the spherical rotor is verified by experiments, and the corresponding rules are summarized. The results of the simulation and analysis are referenced by the optimal design of motor.
Production networks of the Asian automobile industry: regional or global?

Asia is the host of some of the largest automobile markets and top global brands. It has recently taken several initiatives to foster its regional integration, such as Asia-wide trade agreements and infrastructure projects. This article examines the impact of these initiatives on the automobile fragmented production networks of Northeast, Southeast Asia and South Asia to see if they are becoming more regionalised or globalised, and to see if an Asia-wide production network is emerging. We focus on automobile component trade as a proxy of network trade and follow its evolution over the period 2001-2016 at the Asian and subregional level with a special emphasis on two major players, China and Japan. Our results show that a regionalisation process is under way between the three subregions, driven by China and Japan. However, this process is still slow due to the persistence of a high level of protectionism between the three subregions.
Easy-to-operate fabrication of tapered glass capillaries for microdroplet generation

Tapered glass capillaries play an important role in microdroplet generation and related microfluidic applications such as particle synthesis, digital PCR and microrectors. However, its controlled production poses a challenge. Specifically, there is difficulty controlling the tip sizes of capillaries with good repeatability at an affordable cost, which is critical to produce standard droplets for use by research groups. To produce tapered capillaries, micro needle geometries are first pulled by a commercial pipette puller, which yields a sharp tip (i.e. 1–3 m). Those tips need to be enlarged and standardized by post microfabrication. Although larger tips could be achieved by advanced pulling-forging, sanding-forging or breaking-forging methods, the uniformity and repeatability do not meet the requirements for mass production. In this paper, several easy-to-operate fabrication approaches, including mechanical and chemical fabrication methods, are studied. Chemical etching fabrication method shows good repeatability and robust control of dimensions. A capillary droplet microfluidic device assembled by tapered glass capillaries fabricated by chemical etching method is also presented, which shows good performance for droplet generations. This non-labor intensive fabrication is straightforward and be readily adopted for industrial scale mass production.
Measuring neutrino masses with a future galaxy survey

We perform a detailed forecast on how well a EUCLID-like photometric galaxy and cosmic shear survey will be able to constrain the absolute neutrino mass scale. Adopting conservative assumptions about the survey specifications and assuming complete ignorance of the galaxy bias, we estimate that the minimum mass sum of ∑mν ≃ 0.06 eV in the normal hierarchy can be detected at 1. 5σ to 2. 5σ significance, depending on the model complexity, using a combination of galaxy and cosmic shear power spectrum measurements in conjunction with CMB temperature and polarisation observations from PLANCK. With better knowledge of the galaxy bias, the significance of the detection could potentially reach 5. 4σ. Interestingly, neither PLANCK+shear nor PLANCK+galaxy alone can achieve this level of sensitivity; it is the combined effect of galaxy and cosmic shear power spectrum measurements that breaks the persistent degeneracies between the neutrino mass, the physical matter density, and the Hubble parameter. Notwithstanding this remarkable sensitivity to ∑mν, EUCLID-like shear and galaxy data will not be sensitive to the exact mass spectrum of the neutrino sector; no significant bias ( < 1σ) in the parameter estimation is induced by fitting inaccurate models of the neutrino mass splittings to the mock data, nor does the goodness-of-fit of these models suffer any significant degradation relative to the true one (Δχeff2 < 1).
The computation of the thermal conductivity of air in the temperature range 400-1600K

The thermal conductivity of air treated as a binary mixture has been calculated by way of an unmodified and a modified Wassiljewa equation using recent data on lambda , eta and D for O2 and N2. The two expressions are found to yield results in overall agreement with experimental data in the temperature range 400-1600K. The unmodified expression due to Mason and Saxena (1958) perhaps gives more accurate results and may be thus more suitable for predicting the conductivity of other gas mixtures.
Anchors Away: A New Approach for Estimating Ideal Points Comparable across Time and Chambers

Existing methods for estimating ideal points of legislators that are comparable across time and chambers make restrictive assumptions regarding how legislators' ideal points can move over time, either by fixing some legislators' ideal points or by constraining their movement over time. These assumptions are clearly contradictory to some theories of congressional responsiveness to election dynamics and changes in constituency. Instead of using legislators as anchors, our approach relies on matching roll calls in one chamber and session with roll calls or cosponsorship decisions on identical bills introduced in a different chamber or session. By using these “bridge decisions” to achieve comparability, we can remove any assumptions about the movement of legislators' ideal points. We produce these estimates for both chambers from the 102nd (1991–92) to 111th (2009–11) Congresses, and we show that our estimates provide interesting insights into the nature of legislative behavior change.