Miracle-dz/UniFAR-FTUs huggingface dataset:
Mathematical methods for optimising high precision cutting operations

The endeavor for establishing high precision cutting processes with nm-precision requires advancements in terms of manufacturing machinery, material selection and optimising the cutting process itself. This paper presents a mathematically founded approach for determining optimised process parameters using regularisation methods for inverse problems. The optimisation is based on an idealised simulation which relates process parameters like depth of cut and feed velocity to the resulting tool path incorporating elastic deformations. The optimised parameters are then obtained by inverting the simulation model, i.e., a prescribed tool path is given and a suitable control, which yields an approximation within the desired range of precision, is computed. In order to incorporate processing limitations a sparsity technique is included. The approach is successfully tested for two different applications, the design of optimal process parameters and the sparse correction of predefined parameters. The simulation results highlight the potential improvements obtained by this approach.
Position feedback control of a nonmagnetic body levitated in magnetic fluid

This paper is concerned with the position feedback control of a magnetic fluid actuator which is characterized by the passive levitation of a nonmagnetic body immersed in a magnetic fluid under magnetic fields. First of all, the magnetic fluid actuator is designed based on the ferrohydrostatic relation. After manufacturing the actuator, its static and dynamic characteristics are investigated experimentally. With the aid of the dynamic governing relation obtained experimentally and the proportional-derivative controller, the position tracking control of the actuator is carried out both theoretically and experimentally. As a result, the applicability of the proposed magnetic fluid actuator to various engineering devices is verified.
4H-SiC Trench Schottky Diodes for Next Generation Products

A novel trench JBS structure has been developed to reduce the electrical field at the Schottky interface. Compared to the conventional planar JBS structure, the new design has reduced the reverse leakage current by 1 order of magnitude at rated voltage. The much reduced field at the Schottky interface allows an increase in the drift doping concentration, which enables a significant chip size reduction on next generation SiC Schottky diodes. This progress makes it possible to fabricate high current rating (>50 A) SiC diodes for module applications.
Multiple-input multiple-output (MIMO) analog-to-feature converter chipsets for sub-wavelength acoustic source localization and bearing estimation

Localization of acoustic sources using miniature microphone arrays poses a significant challenge due to fundamental limitations imposed by the physics of sound propagation. With sub-wavelength distances between the microphones, resolving acute localization cues become difficult due to precision artifacts. In this work, we present the design of a miniature, microphone array sensor based on a patented Multiple-input Multiple-output (MIMO) analog-to-feature converter (AFC) chip-sets which overcomes the limitations due to precision artifacts. Measured results from fabricated prototypes demonstrate a bearing range of 0 degrees to 90 degrees with a resolution less than 2 degrees. The power dissipation of the MIMO-ADC chip-set for this task was measured to be less than 75 microwatts making it ideal for portable, battery powered sniper and gunshot detection applications.
Study of trapezoidal toothed log‐periodic antenna fed through tapered microstrip line‐to‐coplanar stripline transition

The simulation and experimental studies of a wideband trapezoidal toothed log‐periodic (balanced type) antenna excited through tapered microstrip (MS) line to coplanar stripline (CPS) transition (balanced type feed) are presented in this paper. Effect of the balanced type feed on the performance of antenna is discussed. The tapered MS line provides impedance matching between CPS transition, which is connected to antenna and 50‐Ω coaxial cable. A quarter‐wavelength radial stub at the output end of transition is responsible for field transition. The simulated reflection coefficient‐frequency characteristic of the combination of the antenna and tapered MS line‐to‐CPS transition is compared with the corresponding characteristic of the antenna fed through microstrip‐to‐parallel strip balun. Further, the simulated input and radiation characteristics of the antenna fed through the proposed transition are also compared with corresponding experimental results. The antenna along with transition achieves simulated reflection coefficient bandwidth (reflection coefficient ≤ −10 dB) of 7.67:1 (0.9–6.9 GHz). The simulated peak realized gain and radiation efficiency vary in the range 0.25−5.6 dB and 71−95%, respectively over the operational bandwidth of the antenna‐transition combination. The simulated input and radiation characteristics of the proposed antenna are nearly in agreement with the corresponding measured results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1671–1677, 2015
Partially Composite Sandwich Panel Deflections

A continuum model for evaluating partially composite insulated concrete sandwich panel deflections with discrete shear connectors due to differential volume changes such as those caused by differences in temperature between the wythes is evaluated for accuracy by comparison with finite-element analysis. Design equations for computing these deflections are provided. Analysis of sample panels indicates that the continuum model provides acceptable accuracy for calculating thermal bowing of wall panels. The resulting equations show that, for long panels, the amount of thermal bowing in the panels is relatively insensitive to the stiffness of the connectors. This implies that long insulated sandwich panels with low connecting-layer stiffness will experience nearly the same amount of thermal bowing as fully composite panels.
A Fusion Method of Smile and Laugh Expression Classification

This paper proposed to build a smile expression classification system on data sets of GENKI that can represent real-world environments, and tested its implementation, in which we got the optimal recognition rate up to 86.197%. To deal with the features extraction problems, hybrid features (i.e., Gabor, PHOG, PLBP) are used, using hybrid recognition algorithms (i.e., GentleBoost, SVM) to classify, in this paper. Experiments showed the effectiveness of our methods.
Training and Supervising Lay-providers in Low-income Settings: A Mixed-methods Study of Task-sharing from the Shamiri Randomized Controlled Trial

Objective: Training lay-providers to deliver mental health interventions is both effective and cost-effective. However, more research is needed to document training and supervision procedures and to collect lay-providers’ feedback. We analyzed the acceptability of a 10-hour lay-provider training and supervision delivered primarily by undergraduates. We also tested lay-provider fidelity and quality. Methods: This study documents training and supervision from an RCT of the Shamiri intervention, a 4-session, school-based intervention which significantly reduced symptoms of anxiety and depression in Kenyan adolescents. We delivered a 10-hour training to 13 lay providers (M(SD)age=21.00(1.95), %female=61.54). We also hosted 30-minute supervision meetings twice weekly. Independent raters coded session recordings for fidelity and quality. We also collected quantitative and qualitative feedback from lay-providers. Results: Reliability and mean ratings for all six of our fidelity and quality measures (delivering required content, adhering to specified details, thoroughness, skillfulness, clarity, and purity) were very good to excellent. Lay-provider quantitative ratings of training were also overwhelmingly positive, with an overall satisfaction rating of 6.46/7.00. We identified central qualitative themes in lay provider comments: Generally, comments about training style, content, and personal interactions were overwhelmingly positive, and many lay-providers reported personal growth. Comments about timing and location were mixed. Conclusions: This study provides preliminary evidence that a very brief training delivered primarily by undergraduates can teach high-school-graduate lay-providers to deliver effective mental health interventions. Additionally, we discuss lessons-learned and implications for future research, including the importance of considering local context when planning and of continuously collecting and addressing lay-provider feedback.
The Factual Versus Counterfactual Reading of Affirmative Versus Contrapositive Conditionals in Chinese

Conditionals are extensively used in science and everyday life. A current issue about conditionals is what cases a true conditional (if p then q) implies, or what case is an instance that the conditional refers to. This is the reference inference problem of conditionals. We explore a specific reference inference problem as follows. Given that a specific conditional (e.g., If the card is red, then it is round) is true of one instance, people are asked to judge whether the instance is, is possibly, or is not one of the four truthtable cases (pq, p¬q, ¬pq and ¬p¬q) (where, “¬” = not). We refer to such problems as the instance inference task of conditionals. Its inferential direction is contrary to that of the truth evaluation task in the previous literature that ask people to judge whether a conditional is true or false, given that an instance is one of the four truth-table cases [1-5].
UNDERWATER SHIP HULL INSPECTION

Navy managers need accurate information in order to make cost effective decisions. In the case of ship hull repair or maintenance decisions, the information can often be obtained through Nondestructive Examination (NDE) of the hull. Newly developed NDE hardware and techniques now permit many inspections to be performed on waterborne ships, thus avoiding the cost and/or necessity of dry-docking for inspection. These underwater inspections are also used to forecast accurately hull work requirements for upcoming planned overhauls, to plan and to evaluate underwater repair work, and to monitor the status of known defects in hull structures. Underwater NDE techniques being developed at the Naval Coastal System Center (NCSC) under Naval Sea Systems Command (NAVSEA) sponsorship include stereo photography, magnetic particle inspection, ultrasonic thickness gaging and flaw detection, and electromagnetic weld inspection. Individual techniques are currently in various stages of qualification as Navy approved procedures. Throughout the development process at NCSC, field work on Navy ship hulls has been undertaken in order to assure the techniques' operational effectiveness, accuracy, reliability, and utility to Navy managers. Thus, a substantial body of real world data exists. This paper describes procedures which are being qualified, techniques under development, and cites examples of inspection performed on waterborne ships.
The Tolerance Control Method Based on Zero-Sequence Circulating Current Suppression for Parallel T-Type Three-Level Rectifiers

Zero-sequence circulating current (ZSCC) suppression and fault-tolerant control (FTC) are important guarantees for the safe and reliable operation of parallel T-type three-level rectifiers <inline-formula> <tex-math notation="LaTeX">$({\mathrm {PT}}^{2}3{\mathrm {LRs}})$ </tex-math></inline-formula>. However, none of the existing literature can solve the FTC under the ZSCC suppression of the <inline-formula> <tex-math notation="LaTeX">${\mathrm {PT}}^{2}3{\mathrm {LRs}}$ </tex-math></inline-formula> when the open switch fault (OSF) occurs in neutral-point (NP) switches. In order to solve these issues, a novel FTC method based on ZSCC suppression is proposed in this article. First, an improved finite-time controller is constructed to suppress the ZSCC by adjusting the difference of zero-sequence duty ratio between two rectifiers, completely. Then, based on the principle of area equivalence, the switching sequence is reconstructed by changing the state switching mode of the fault phase in real-time. As a result, the FTC under the OSF of NP switches is realized without affecting the suppression of ZSCC. Compared with the existing methods, the proposed method not only realizes the suppression of the ZSCC of the <inline-formula> <tex-math notation="LaTeX">${\mathrm {PT}}^{2}3{\mathrm {LRs}}$ </tex-math></inline-formula> but also completes the FTC under the OSF of NP switches, which guarantees the ZSCC suppression ability under the OSF of NP switches. Consequently, the power quality of the ac side of the <inline-formula> <tex-math notation="LaTeX">${\mathrm {PT}}^{2}3{\mathrm {LRs}}$ </tex-math></inline-formula> is improved significantly during the normal operation and the operation under the OSF of NP switches. Thus, the safe and reliable operation of the <inline-formula> <tex-math notation="LaTeX">${\mathrm {PT}}^{2}3{\mathrm {LRs}}$ </tex-math></inline-formula> is guaranteed effectively. Finally, the feasibility and correctness of the proposed method are verified by experiment results.
Performance and limitations of chirped grating lenses of ti-indiffused liNbO 3 planar waveguides

Etched and deposited groove chirped grating lenses have been successfully designed, fabricated, and evaluated for the first time on Ti-indiffused LiNbO 3 waveguides. The design procedure, the expected and measured performances, the materials and fabrication processes developed, and the performance limitations imposed by the waveguide parameters and by the fabrication procedures are presented.
An exploratory study of workflow support for tactical teams

Tactical teams need tools to support their collaboration and help coordinate their workflow. We developed the concept of workflow coordinating representations (WCRs) to provide a common workspace and coordination space. Two questions are whether there are general good design properties for WCRs, and whether there are limits to the types of tasks to which these properties can be applied successfully. Experiment 1 examined a range of design properties within a well-structured team task: collecting and analyzing biometric data during a maritime interdiction operation. Naïve participants performed the biometrics task and then rated the designs. A detailed WCR design that well matched the workflow of the task was rated more highly than other designs. Experiment 2 applied the detailed design to an ill-structured team task: planning a military rescue mission. There was a WCR for organizing the capabilities of each available asset and another WCR for laying out a detailed timeline of events. Simple maps of the mission area were rated more highly as a collaboration tool than the WCRs. The design properties that were effective for the well-structured task did not benefit the brainstorming nature of the ill-structured task, except for documenting a solution once the brainstorming was complete.
Segmentbrücke aus textilbewehrtem Beton: Konstruktion, Fertigung, numerische Berechnung

Seit langem bietet der zementgebundene Beton ein breites Feld von konstruktiven Gestaltungs‐ und Herstellungsmöglichkeiten. Seine geringe Zugtragfähigkeit wird beim Stahlbeton durch eine eingelegte Bewehrung kompensiert. Ersetzt man diese Betonstahlbewehrung durch die im Bereich von Faserverbundkunststoffen etablierten textilen Bewehrungen, entsteht der neue Verbundwerkstoff “Textilbewehrter Beton”. Aufgrund der korrosionsbeständigen textilen Bewehrung und der damit verbundenen geringen Betonüberdeckung ist die Realisierung sehr dünnwandiger Bauteile möglich. Filigrane Elemente aus Textilbeton stellen eine völlig neue Anwendung des Baustoffes Beton dar und erweitern die Planungsfreiheit von Architekt und Ingenieur. Für die erste Brücke aus textilbewehrtem Beton werden Konstruktion, Bewehrungskonzept, Fertigung, Zulassungsversuche und numerische Simulationen mit unscharfen Daten vorgestellt. An diesem Beispiel wird gezeigt, dass dieser leistungsfähige Verbundwerkstoff trotz zahlreicher offener Fragen schon heute erfolgreich angewendet werden kann.
PET reconstruction using multisensor fusion techniques

We propose a methodology for Positron Emission Tomography(PET) reconstruction using Multi Sensor Fusion techniques. Improvement of spatial resolution of PET images is achieved with the proposed method. Fusion of the PET images with the correlated MRI(CT) images is performed using fuzzy set theory and belief functions. Using the a priori values obtained from the fusion process, we reconstruct the image using Bayes' law. Simulation studies performed using the Shepp-Logan head phantom show the feasibility of the process and improvement in the reconstructed PET image.
Recurrent fuzzy neural network controller design using sliding-mode control for linear synchronous motor drive

A sliding-mode recurrent fuzzy neural network control (SMRFNNC) is proposed to control the mover of a permanent-magnet linear synchronous motor (PMLSM) servo drive so as to track a periodic sinusoidal reference trajectory. First, the PMLSM drive system is identified by a recurrent fuzzy neural network identifier (RFNNI) to provide sensitivity information of the drive system to a recurrent fuzzy neural network controller (RFNNC). Next, a sliding-mode adjuster (SMA) is determined according to the sliding mode condition. Then, the SMA is backpropagated through the RFNNI to train the parameters of the RFNNC online. Simulated and experimental results show that the control effort and chattering of the SMRFNNC are smaller than those of sliding-mode control. Moreover, a robust control performance is achieved when uncertainties occur including a nonlinear friction force.
Accurate measurement of d.c. and a.c. by transformer

The magnetic integrator, which uses an amplifier, the output of which is led back through a transformer, can be used as an ideal current transformer for measuring a.c. and bipolar d.c. with a large bandwidth. To eliminate drift of the working point (zero flux), a 2nd-harmonic modulator detects any deviation of the mean value of the flux from zero and controls the integrator, so that the balance is maintained. With this assembly, an accuarcy of the order of 10? 5 magnetomotive-force is obtained, and it is not influenced by distortion of the magnetic field around the primary current-carry conductor
Full Capability of Harmonic Current Mitigation for a Wind Energy System

Abstract —In this article, a novel control strategy is proposed to exploit the full capability, in terms of active filtering, of a wind energy conversion system based on a doubly fed induction generator. To achieve control of the wind energy conversion system, the rotor of the doubly fed induction generator is connected to the grid through a back-to-back pulse-width modulation converter. The proposed algorithm is applied to the rotor-side converter to ensure simultaneous active power production and power quality improvement. Depending on the nominal rotor-side converter power, the control strategy manages the wind energy conversion system function priorities between active power production, reactive power compensation, and current active–selective filtering without any system overrating. This study's main goal is to exploit the full capability of the rotor-side converter in terms of active and selective filtering. In fact, it is proposed to eliminate the whole harmonic currents if possible, or to compensate the fifth and the seventh predominant components and a part of the rest of the harmonic currents. Otherwise, one may filter a part of these two predominant harmonics in such a way that the rotor-side converter operates at its full capacitance. Simulation results demonstrate the effectiveness of the proposed strategy.
Modelling Failure Modes and Effects Analysis

Presents a critical review of the method of FMEA and in particular of the risk priority number (RPN) used for ranking failure modes. Though the method itself is of great use, the calculation of the RPN lacks a proper model as a base and is thus internally inconsistent and potentially misleading. Proposes an alternative procedure, based on a simple model and using expected costs as the basis for ranking failure modes.
The NOPTILUS project: Autonomous Multi-AUV Navigation for Exploration of Unknown Environments

Abstract Current multi-AUV systems are far from being capable of fully autonomously taking over real-life complex situation-awareness operations. As such operations require advanced reasoning and decision-making abilities, current designs have to heavily rely on human operators. The involvement of humans, however, is by no means a guarantee of performance; humans can easily be over-whelmed by the information overload, fatigue can act detrimentally to their performance, properly coordinating vehicles actions is hard, and continuous operation is all but impossible. Within the European funded project NOPTILUS we take the view that an effective fully-autonomous multi-AUV concept/system, is capable of overcoming these shortcomings, by replacing human-operated operations by a fully autonomous one. In this paper, we present a new approach that is able to efficiently and fully-autonomously navigate a team of AUVs when deployed in exploration of unknown static and dynamic environments towards providing accurate static/dynamic maps of the environment. Additionally to achieving to efficiently and fully-autonomously navigate the AUV team, the proposed approach possesses certain advantages such as its extremely computational simplicity and scalability, and the fact that it can very straightforwardly embed and type of physical or other constraints and limitations (e.g., obstacle avoidance, nonlinear sensor noise models, localization fading environments, etc).
The Study of Denitrification Rate and N2O Release Rate in Shuangtaizi Estuary Wetland

The denitrification and its influencing factors were studied in reed, suaeda heteroptera and reed degraded wetland. PDR were similar in reed and suaeda heteroptera wetland; primary influencing factors were temperature, nitrate and TOC. pN2O, N2O/ (N2O + N2) were less in reed wetland than that in suaeda heteroptera wetland; significant influencing factor was ORP. Compared with the reed wetland, the PDR in reed degraded wetland had significantly reduced, whose limiting factor was TOC concentration in soil; the ration of N2O/ (N2O + N2) had increased and the pN2O had no obvious change in reed degraded wetland.
AN ENERGETIC APPROACH FOR INTERFACE DELAMINATION PROBLEM IN SLIDING MODE WITH COHESIVE OR ADHESIVE CONTACT

Abstract A new interface delamination model of a layered structure is discussed. The concept of the solution is developed by the mathematical model of interface contact damage. The proposed numerical solution considers the rate independent evolution at small strain and the concept of the energetic solution. Applied energetic formulation governs the debonding process by means of two interface variables. Presented numerical example demonstrates its theoretical applicability of the whole solution approach in the engineering practise.
Calculation of narrow-band spectra by direct decimation

The calculation of the spectrum of a narrow-band signal which is embedded in a broad-band sequence usually requites substantial computation and storage if executed by performing an FFT or DFT's directly on the broad-band sequence. In this paper a new scheme using direct decimation is proposed which computes the narrow-band spectrum with good resolution while requiring only modest computation and storage. The performance of the proposed scheme is analyzed. Examples are presented which demonstrate the efficiency of this scheme when compared with the FFT, DFT, zoom transform, and complex modulation scheme.