Miracle-dz/UniFAR-FTUs huggingface dataset:
A multi-agent system embedded to a Product Lifecycle Management to synthesise and reuse industrial knowledge

This article presents a Knowledge Management experiment carried out in an industrial company. Our research concerns the development of a knowledge engineering module integrated in a Product Lifecycle Management (PLM) system which is based on a multi-domain scheme (project, product, process and use) taking into consideration several viewpoints (structural, functional, dynamic, etc.). This PLM system enables us to capture technical data and information throughout design projects. The development of this PLM system concerns the implementation of knowledge engineering features, using multi-agent technology. This approach allows us to model the collaborative engineering activities and synthesise industrial knowledge during projects (vocabulary, rules, experiences, etc.) using technical information.
Undervoltage load shedding for induction motor dominant loads considering P, Q coupling

A technique is presented that is suitable for undervoltage load shedding (UVLS) of dominant induction motor loads in power systems. To derive the algorithm, the induction motor voltage-dependent characteristics are formulated along a line parallel to the previously proposed generic dynamic load model. The load model is derived from the third-order induction motor model and is expressed in terms of real power, reactive power and slip, while retaining its dynamic characteristics. For the period following the initial induction motor transients (t>3 s), the model has been further simplified, explicitly representing the real and reactive power coupling in load dynamics. In the event of a voltage unstable situation, at a given voltage, the proposed UVLS criterion can be used to calculate the amount of load to be shed at any time to arrest voltage instability. It is shown that, when the induction motor dynamics are approximated using the first-order generic dynamic load models proposed in literature, the predicted amount of load to shed is approximately 2-3 times the amount obtained using the proposed method. This is owing to the real and reactive power coupling in the load dynamics. The proposed method is general and can be applied to any power system, provided the proportion of induction motor loads is approximately known.
The Long-Term Dynamics in Crude Oil Prices

This paper reviews a long-term crude oil markets and trend of dynamic prices during 1986-2011. Based on the hypothesis that crude oil prices dynamics reflect the activity of a competitive market, a jump diffusion model is investigated to examine the empirical performance in a time series. Historical data analysis shows that crude oil prices were characterized by high volatility, high intensity jumps, and strong upward drift, and were concomitant with underlying fundamentals of crude oil markets and world economy. Furthermore, the model forecast that crude oil prices will still have an increasing trend, stay in jump for the next couple of years.
Controller reduction via frequency weightings considering $H_{\infty}$ property preservation

In this paper, a new $H_{\infty}$ controller reduction method is proposed to preserve the $H_{\infty}$ property using frequency weightings. It is necessary to consider decreasing degradation of $H_{\infty}$ property for $H_{\infty}$ controller reduction. It is well known that all $H_{\infty}$ controllers are represented by free parameters which are stable and bounded. In the paper, frequency weightings are given to stabilize the free parameters, and low‐order controller is provided by using frequency‐weighted balanced technique. Some numerical examples are given to show the effectiveness of the method. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 166(2): 63–69, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20683
State-plane analysis of zero-voltage-switching resonant DC/DC converters

The state-plane analysis technique is established for the zero-voltage-switching resonant DC/DC power converter family of topologies, namely the buck, boost, buck-boost, Cuk, sepic, and dual-sepic converters. The state plane provides a compression of information, which allows the designer to examine the nonlinear dynamics of resonant converter operation. Utilizing the state plane, modes of resonant converter operation are examined. Expressions are derived for the switching frequencies at the boundaries between these modes and at the boundary of energy conversion. >
Power flow control in DC transmission grids using mechanical and semiconductor based DC/DC devices

DC power flow can be controlled though N-1 different DC lines/cables in a DC grid having N individual AC/DC converters. A large meshed DC grid can have more DC lines, and since we can not control power in all lines/cables, an overload may result. In this paper, two methods are proposed for DC power flow control through DC lines/cables. The first method involves using extra resistors embedded in series with DC lines/cables and switched by mechanical or semiconductor based DC circuit breakers. The other method includes installing DC/DC converter at one of the DC line/cable ends with the purpose of DC power flow control. It is shown that the first approach suits better for a short transmission line/cable, while the second one is proposed for a long transmission line/cable with high rated current and higher voltage drop. PSCAD simulation results are presented for a half bridge bidirectional DC chopper employed for DC power flow control between two large 370kV DC grids. (6 pages)
Service-Oriented Real-Time Energy-Optimal Regenerative Braking Strategy for Connected and Autonomous Electrified Vehicles

This paper presents a real-time vehicle speed planning system called the real-time energy-optimal deceleration planning system (RT-EDPS). Connectivity and autonomous driving technologies that provide map and navigation data, traffic light information, and front detection sensor data are exploited to perceive and forecast upcoming deceleration events. A parameterized polynomial-based deceleration model is employed as the deceleration strategy. Real driving test data that characterize the physical limits of regenerative braking are used to model the objective function and constraints of the parameterized deceleration commands. The proposed RT-EDPS involves two speed-planning strategies with different scales of the planning horizon. Within a deceleration event horizon ascertained by the signal phase and timing data of traffic signals and 3D geographic map data, a dynamic programming-based energy-efficient deceleration strategy is used to generate long-sighted speed profiles. While the scheduled vehicle speed is being tracked, if a preceding vehicle is detected within a predefined threshold range, then a model predictive control-based energy-efficient deceleration strategy that incorporates the traffic status ahead of the ego vehicle and exploits V2V communication with the preceding vehicles is activated to re-plan the speed trajectory of the vehicle to guarantee a collision-free distance for the preceding vehicle. In virtual driving experiments, we record energy-recuperation efficiency gains of over 40% as compared to human drivers.
Pulsed 0.75kW output single-ended GaN-FET amplifier for L/S band applications

A pulsed 0.75 kW output GaN-FET amplifier for L/S band high power applications has been successfully developed. A single-ended configuration is adopted to make the amplifier compact and simple. The amplifier delivers a saturated output power of 0.75 kW under pulsed RF operation at 2.14 GHz, which is believed to be the highest output power reported in an L/S band single-packaged device.
Inkjet-printing- and electroless-plating- based fabrication of RF circuit structures on high-frequency substrates

In this paper, a method to fabricate radio frequency (RF) circuit structures is described. This method involves inkjet printing of a silver nanoparticle-based ink on a functional substrate material to create the seed track (i.e., the seed layer), onto which copper is subsequently deposited by an electroless plating method, to obtain the desired thickness and conductivity of the RF structures. This process combination was validated by fabricating an S-band filter on a high-frequency substrate and comparing the RF performance of this filter with that of a filter fabricated using the conventional lithography-based method. The adhesion of the circuit structures to the substrate was qualitatively ascertained by the scotch tape test method. The performance of the inkjet-printed–electroless-plated filter was comparable to that of the conventional filter, thus proving the suitability of this novel method for practical RF applications.
Advanced positioning technologies for co-operative systems

The authors describe a systems approach for a future positioning system to be developed for the European co-operative vehicle infrastructure systems (CVIS) project that deals with increased transport safety and efficiency using advanced positioning, mapping and communication technologies. Positioning and mapping functions will be provided by the sub-project for positioning, mapping and location referencing (POMA), in which new methods for the combination of several positioning components will be developed. The whole positioning system setup of CVIS will then be deployed at DLR in Berlin. This setup will not only cover onboard components but also infrastructure-based sensors and sensor networks together with enhanced positioning algorithms. Furthermore, new functionalities for mapping and map matching as well as the consideration of integrity conditions and confidence circles are a major topic of the work. This new approach will ensure high accuracy and reliability of field trials spread over Europe.
The Morgan Hill Earthquake of April 24, 1984—Investigation of Lifelines

The overall response of all lifelines was good although there was some significant damage. In the power system there was significant damage to 500 kV circuit breakers at two substations, some other minor substation damage, and some damage to feeders in the distribution system. The substation damage did put a segment of one of the AC Pacific Interties out of service for a couple of days but the remaining intertie was able to carry the load. The loss of feeder lines caused local disruption of power for up to 5 hours. In water and sewage systems two 8 inch transit water lines broke in Morgan Hill and a break in an 8 inch pipe to a 350,000 gallon tank caused a large water loss. Five 6 inch water line couplings disengaged. There were numerous water service connection failures in the high damage area. There was no significant damage to communication systems but there was a significant downgrade in the quality of service due to system overload. Calls from outside the area were limited by AT&T. Damage to highway systems was limited to that caused by a rock slide which blocked E. Dunne Avenue near the Anderson Reservoir and damaged a nearby bridge over the reservoir. One bridge span moved one foot near an abutment and caused the adjacent pier to move out of plumb by almost one foot. The road surface on the crest of the Anderson Dam was cracked but there was no damage to the dam. In the natural gas system there was no damage to the utilities part of the system. A large fire in San Jose was caused by a gas leak in piping to a gas fired industrial heater. There was an explosion and fire in a mobile home and numerous leaks associated with toppled water heaters. There were numerous leaks beyond service connections to homes in the high damage area.
Medical Instrumentation: Application and Design

Basic Concepts of Medical Instrumentation (W. Olson). Basic Sensors and Principles (R. Peura & J. Webster). Amplifiers and Signal Processing (J. Webster). The Origin of Biopotentials (J. Clark). Biopotential Electrodes (M. Neuman). Biopotential Amplifiers (M. Neuman). Blood Pressure and Sound (R. Peura). Measurement of Flow and Volume of Blood (J. Webster). Measurements of the Respiratory System (F. Primiano). Chemical Biosensors (R. Peura). Clinical Laboratory Instrumentation (L. Wheeler). Medical Imaging Systems (M. Siedband). Therapeutic and Prosthetic Devices (M. Neuman). Electrical Safety (W. Olson). Appendix. Index.
Environmentalism and Consumers' Clothing Disposal Patterns: An Exploratory Study

This exploratory study examined (a) the influence of consumers' general environmental attitude and waste recycling behavior on their clothing disposal patterns; and (b) the influence of gender, age, and ethnicity on clothing disposal patterns, environmental attitude, and waste recycling behavior. Data (N = 468) were collected from undergraduates in a large-sized Southwestern university. Based on focus group interviews and a pilot test, eight a priori patterns of clothing disposition were identified: (a) Economically Motivated Resale, (b) Environmentally Motivated Resale, (c) Charity Motivated Donation, (d) Environmentally Motivated Donation, (e) Economically Motivated Reuse, (f) Environmentally Motivated Reuse, (g) Convenience-Oriented Discarding, and (i) Unawareness-Based Discarding. In addition to Cronbach's alpha coefficients, validities and reliabilities for these eight constructs were examined using the LISREL analysis. Relationships between independent variables (environmental attitude and waste recycling behavior) and dependent variables (eight clothing disposal patterns) were tested by using the structural equation model of the LISREL analysis. It was found that environmental attitude had a stronger influence on several environmentally oriented clothing disposal patterns than did waste recycling behavior. One-way analysis of variance indicated that gender, age, and ethnicity selectively predicted environmental attitude, waste recycling behavior, and clothing disposal patterns. For instance, the female student and the older student were more likely to choose environmentally oriented disposal methods than were their counterparts. White students had a slightly stronger attitude toward the environment than did non-white students but were not different in clothing disposal patterns. Suggestions for future studies are discussed.
Microwave Characterization of Partially Magnetized Ferrites

In order to assist the microwave engineer in predicting the performance of partially magnetized devices, we have characterized the microwave permeability of partially magnetized materials. The real part of the tensor permeability elements, /spl mu/, /spl kappa/, and /spl mu//sub z/, depends primarily on the parameters /spl gamma/4/spl pi/M//spl omega/ and /spl gamma/4/spl pi/M/sub s/ / /spl omega/. Empirical formulas have been developed which show the dependence. At frequencies sufficiently below /spl omega/ = /spl pi/4/spl pi/M/sub s/, the loss can be characterized by the value of /spl mu/'' at 4/spl pi/M = 0. /spl mu/, /spl kappa/, and /spl mu//sub z/ depend weakly on composition, whereas /spl mu/'' (4/spl pi/M = 0) does depend upon the chemical composition.
Comparison of Stacked Sentinel‐3 A&B and AltiKa Repeat Cycle Data

Sentinel‐3 A&B radar altimeters yield sea surface height measurements in both a high‐precision Synthetic Aperture Radar Mode (SARM), and a Pseudo‐Low Resolution Mode (PLRM). We stacked repeat cycles from both missions and in both modes to compare their resolution of small seamounts. Stacking entailed removing non‐geoidal heights and height errors, testing for consecutive measurements over ocean, aligning to common locations at 1 km intervals along a synthetic track, and forming a median height profile. These profiles are available from the National Centers for Environmental Information (NCEI) data repository. Global maps show that, over the oceans, the median height is usually derived from more than 49 cycles, and the typical error in an individual PLRM measurement is approximately 1.9 times greater than an individual SARM measurement. We applied a seamount detection bandpass filter to the median profiles and compared their spectral resolution to that of the Satellite for ARgos and AltiKa (SARAL) AltiKa mission. Small seamounts are similarly resolved by Sentinel‐3 A&B SARM data and by the SARAL/AltiKa data.
In-Plane Electromagnetic Generator Fabricated on Printed Circuit Board Technology

Small and efficient energy harvesters, as a renewable power supply, draw lots of attention in the last few years. This paper presents a planar rotary electromagnetic generator with copper coils fabricated by using printed circuit board (PCB) as inductance and Nd-Fe-B magnets as magnetic element. Coils are fabricated on PCB, which is presumably cost-effective and promising methods. 28-pole Nd-Fe-B magnets with outer diameter of 50 mm and thickness of 2 mm was sintered and magnetized, which can provide magnetic field of 1.44 Tesla. This harvester consists of planar multilayer with multi-pole coils and multi-pole permanent magnet, and the volume of this harvester is about 50x50x2.5 mm3. Finite element analysis is used to design energy harvesting system, and simulation model of the energy harvester is established. In order to verify the simulation, experiment data are compared with simulation result. The PCB energy harvester prototype can generate induced voltage 0.61 V and 13.29mW output power at rotary speed of 4,000 rpm.
Power/Clock Network-Aware Routing Congestion Estimation Methodology at Early Design Stage

This paper proposes the methodology to estimate the routing congestion of modern IC quickly and accurately at the early stage of the design flow. The occurrence of over-congestion in the routing process causes routing failure which then takes unnecessary time to re-design the physical design from the beginning. The precise estimation of routing congestion at the early design stage leads to a successful physical design that minimizes over-congestion which in turn reduces the total design time cost. The proposed estimation method at the block-level floorplan stage measures accurate routing congestion by using the analyzed virtual interconnections of inter/intra blocks, synthesized virtual power/ground and clock networks.
Potentiality of semiconducting diamond as the base material of millimeter-wave and terahertz IMPATT devices

An attempt is made in this paper to explore the potentiality of semiconducting type-IIb diamond as the base material of double-drift region (DDR) impact avalanche transit time (IMPATT) devices operating at both millimetre-wave (mm-wave) and terahertz (THz) frequencies. A rigorous large-signal (L-S) simulation based on the non-sinusoidal voltage excitation (NSVE) model developed earlier by the authors is used in this study. At first, a simulation study based on avalanche response time reveals that the upper cut-off frequency for DDR diamond IMPATTs is 1.5 THz, while the same for conventional DDR Si IMPATTs is much smaller, i.e. 0.5 THz. The L-S simulation results show that the DDR diamond IMPATT device delivers a peak RF power of 7.79 W with an 18.17% conversion efficiency at 94 GHz; while at 1.5 THz, the peak power output and conversion efficiency decrease to 6.19 mW and 8.17% respectively, taking 50% voltage modulation. A comparative study of DDR IMPATTs based on diamond and Si shows that the former excels over the later as regards high frequency and high power performance at both mm-wave and THz frequency bands. The effect of band to band tunneling on the L-S properties of DDR diamond and Si IMPATTs has also been studied at different mm-wave and THz frequencies.
A Novel Reconfigurable Cpw-Fed Slot Antenna

A novel low-profile reconfigurable CPW-fed slot antenna that is designed using a half-wavelength slot-line resonator is proposed in this paper. Frequency hopping can be easily achieved by incorporating a pair of PIN diodes, being controlled in either their on or off state. Benefited from the magnetic current distribution of a half-wavelength slot-line resonator, the radiation patterns at the two operating frequencies (1.8GHz and 2.45GHz) are very stable, being almost identical. The proposed antenna is designed and fabricated, and the theoretical and measured results are presented and show good agreement.
Learning a new area with and without the use of tactile maps: a comparative study

Most of the literature on tactile maps for the visually handicapped has concentrated upon production techniques and upon symbol discriminability, with very few studies evaluating the use of maps in complex settings compared with other learning techniques. A small-scale study is presented, in which six subjects learned two new areas of their city, in a counterbalanced design: three learned the first area with the aid o f a tactile map and the second without; the other three subjects learned the second area with a map and the first without. The availability o f a map conveyed no overall advantages to these skilled travellers, either in terms of speed of travel or of information gained; but individual differences in preferences for and in the use of the maps were noted. Congenitally blind individuals would seem as able to benefit from tactile maps as are the adventitiously blind; but the general benefits of such maps should not be overstated.
Data-driven state detection algorithm for multi-scale systems and its application

To improve the security and reliability of equipment and reduce their failure rate, a data-driven state detection algorithm was proposed. The concepts of multi-scale system, multi-scale entropy and multi-scale exergy were defined. The algorithm is used for multi-scale systems whose state parameters change over time and have the characteristic of increasing monotonically on a dominant scale. An abrasion index for the middle speed roller ring mill was constructed, which was used to monitor the states of the instruments. Noise that affected the accuracy of the results was analyzed. The results of simulation experiments demonstrate the effectiveness of the algorithm, which can provide a technical basis for condition maintenance.
Performance Evaluation of Energy Efficient Speed Control Techniques for Capacitor-run Single-phase Induction Motor Driving Domestic Fans

Abstract This article shows the systematic evaluation of the performance of capacitor-run induction motor driving domestic fans using different power conversion methods. The power converters employed are AC/AC converters with phase angle control and multiple pulse width modulation AC chopper and integral cycle control. It is shown through extensive simulation and experimentation that phase angle control in the main winding of the fan motor yields improved results.
Structural Damage Detection Using Parameters Combined with Changes in Flexibility Based on BP Neural Networks

Modals of BP neural networks with different inputs and outputs are presented for different damage detecting schemes. To identify locations of structural damages, the regular vectors of changes in modal flexibility are looked on as inputs of the networks, and the state of localized damage are as outputs. To identify extents of structural damage, parameters combined with changes in flexibility and the square changes in frequency are as inputs of the networks, and the state of damage extents are as outputs. Examples of a simply supported beam and a plate show that the BP neural network modal can detect damage of structures in quantitative terms.