Miracle-dz/UniFAR-FTUs huggingface dataset:
International Journal of Emerging Electric Power Systems Zero-Sequence Current Control of Modular Active Power Filter for High Power Three-Phase Three-Wire Electrical Networks

Since the development of the first control strategy for the active power filters (APF) introduced by H. Akagi [H. Akagi, Y. Kanazawa,A. Nabae, Generalized theory of the instantaneous reactive power in three-phase circuits, in: Proceedings of International Power Electronics Conference, Tokyo, Japan (1983) 1375–1386. ], many efforts have been concentrated to improve their performances. However, when electrical networks supplies high current nonlinear loads, a single inverter-based APF has limited power capability. In this paper, we studied parallel operation achieving high power level. More particularly, we examined a modular APF based on two three-phase inverters. This structure allows zero-sequence current circulating through the inverters, as demonstrated by using averaged modelling of the APF. To solve this problem and based on previous averaged model, we proposed a new optimal control strategy, suppressing the zero-sequence circulating current. Simulation results validate the proposed control.
OPTIMAL PUMPING POLICY FOR AQUIFER DECONTAMINATION BY PUMP AND TREAT METHOD USING GENETIC ALGORITHM

ABSTRACT Groundwater pollution is a major problem in many countries. Pump and treat is one of the commonly used remediation technique for the decontamination of the polluted aquifer system. This paper presents a simulation optimization model to obtain the optimal pumping rates to cleanup a confined aquifer. A coupled finite element method (FEM) based model has been developed for flow and solute transport simulation, which is embedded with the genetic algorithm (GA) optimization model to assess the optimal pumping pattern for different scenarios for the remediation of contaminated groundwater. Using the FEM-GA model, the optimal pumping pattern for the abstraction wells is obtained to minimize the total lift costs of groundwater along with the treatment cost. The model is applied to determine the minimum pumping rates to remediate an existing contaminant plume. The proposed model has been applied for the decontamination of a hypothetical confined aquifer to demonstrate the effectiveness of the technique considered presently. Through the study, it was found that an optimal pumping policy for aquifer remediation can be established using the pump and treat method by applying the present FEM-GA model.
Digital spectra of non-uniformly sampled signals: theories and applications. I. Fundamentals and high speed waveform digitizers

The author derives a digital spectral representation of a nonuniformly sampled signal. He presents a detailed spectrum analysis of a nonuniformly sampled sinusoid, showing that the spectrum comprises uniformly spaced line spectra. In addition, the signal-to-noise ratio is obtained in closed form. The theories are then applied to analyze the harmonic distortion introduced in high-speed waveform digitizers due to time-base errors. The digitizers analyzed are those which utilize interleaving/multiplexing and random equivalent-time sampling techniques to extend their capabilities. Theoretical results are confirmed by the experimental results for an actual waveform digitizer. <<ETX>>
Instantaneous power components in polyphase systems under nonsinusoidal conditions

A generalised theory of electric power for polyphase systems has been developed which is based on the concepts of instantaneous real power and instantaneous imaginary power. The line current vector is decomposed into two orthogonal components, without need of appealing to math a mathematical transformation of the phase components. Each current component is physically associated with a term of different instantaneous power. The proposed theory permits both identifying defined current/power components in three-phase circuits, and setting the bases of the use of instantaneous reactive power compensation via an active power filter without energy storage circuits. Simulation of a practical case shows results that confirm the proposed theory.
Neuronal function and dopamine signaling evolve at high temperature in Drosophila

Neuronal activity is temperature-sensitive and affects behavioral traits important for individual fitness, such as locomotion and courtship. Yet we do not know enough about the evolutionary response of neuronal phenotypes in new temperature environments. Here we use long-term experimental evolution of Drosophila simulans populations exposed to novel temperature regimes. Here, we demonstrate a direct relationship between thermal selective pressure and the evolution of neuronally expressed molecular and behavioral phenotypes. Several essential neuronal genes evolve lower expression at high temperatures and higher expression at low temperatures, with dopaminergic neurons standing out by displaying the most consistent expression change across independent replicates. We functionally validate the link between evolved gene expression and behavioral changes by pharmacological intervention in the experimentally evolved D. simulans populations as well as by genetically triggered expression changes of key genes in D. melanogaster. Since natural temperature clines confirm our results for Drosophila and Anopheles populations, we conclude neuronal dopamine evolution is a key factor for temperature adaptation.
Evaluating artificial intelligence heuristics for a flexible Kanban system: simultaneous Kanban controlling and scheduling

This paper evaluates several artificial intelligence heuristics for a simultaneous Kanban controlling and scheduling on a flexible Kanban system. The objective of the problem is to minimise a total production cost that includes due date penalty, inventory, and machining costs. We show that the simultaneous Kanban controlling and scheduling is critical in minimising the total production cost (approximately 30% cost reduction over scheduling without a Kanban controlling). To identify the most effective search method for the simultaneous Kanban controlling and scheduling, we evaluated widely known artificial intelligence heuristics: genetic algorithm, simulated annealing, tabu search, and neighbourhood search. Computational results show that the tabu search performs the best in terms of solution quality. The tabu search also requires a much less computational time than the genetic algorithm and the simulated annealing. To further improve the solution quality and computational time for a simultaneous Kanban controlling and scheduling on a flexible Kanban system, we developed a two-stage tabu search. At the beginning of the tabu search process, an initial solution is constructed by utilising the customer due date information given by a decision support system. The two-stage tabu search performs better than the tabu search with a randomly generated initial solution in both the solution quality and computational time across all problem sizes. The difference in the solution quality is more pronounced at the early stages of the search.
Evaluation of fatigue life reliability of steering knuckle using pearson parametric distribution model

Steering module is a part of automotive suspension system which provides a means for an accurate vehicle placement and stability control. Components such as steering knuckle are subjected to fatigue failures due to cyclic loads arising from various driving conditions. This paper intends to give a description of a method used in the fatigue life reliability evaluation of the knuckle used in a passenger car steering system. An accurate representation of Belgian pave service loads in terms of response-time history signal was obtained from accredited test track using road load data acquisition. The acquired service load data was replicated on durability test rig and the SN method was used to estimate the fatigue life. A Pearson system was developed to evaluate the predicted fatigue life reliability by considering the variations in material properties. Considering random loads experiences by the steering knuckle, it is found that shortest life appears to be in the vertical load direction with the lowest fatigue life reliability between 14000–16000 cycles. Taking into account the inconsistency of the material properties, the proposed method is capable of providing the probability of failure of mass-produced parts.
Effect of Supplementing Sheep Diet with Glycyrrhiza glabra and Urtica dioica Powder on Growth Performance, Rumen Bacterial Community and some Blood Biochemical Constituents

In this study, nine male Dallagh sheep (initial weight 35±2 kg) were used in a replicated 3 × 3 latin square design experiment with three treatments and three 21-day periods (14 d adaptation, 7 d collection). Treatments were control (without addition) and two treatment diets containing 10% dry matter Glycyrrhiza glabra (licorice) and Urtica dioica (nettle) powder. The dry matter intake, average daily gain, feed conversion ratio were determined. Rumen fluid was obtained at 0, 4 and 8 hours after feeding. Also, blood samples were collected 2 h after feeding. Diet containing 10% licorice significantly increased feed conversion ratio versus control (P<0.05). In licorice treatment, lactic acid bacteria in rumen fluid were lower than nettle 8 hours after morning feeding. Sheep fed licorice had higher rumen protozoa count than control before morning feeding (P<0.05). Dietary supplementations had no effect on the weight gain, dry matter intake, and total count of bacteria, coliforms, rumen pH, blood glucose, total protein, triglyceride, cholesterol, and albumin. In conclusion, licorice dry powder decreased lactic acid bacteria, increased feed conversion ratio, and had no significant effect on other studied factors. Also, nettle had no effect on performance, blood metabolite and rumen parameters.
Prediction of Reaction Force on External Indenter in Cell Injection Experiment Using Support Vector Machine Technique

Evaluation of the reaction force on a tool which is used for exertion of force on biomaterials such as biological cells or soft tissues has applications in virtual reality based medical simulators or haptic tools. In this study, two least square based support vector machine (SVM) models have been constructed to predict the indentation or reaction force on mouse oocyte and embryo cells in cell injection experiment. Inputs of these two models are geometrical parameters of indented cell, namely dimple radius (a), dimple depth (w) and radius of the semicircular curve (R). Experimental data for calibration and prediction of the models have been captured from literatures. The performance of the models has been evaluated using root mean square error (RMSE), correlation coefficient (r), relative error of prediction (REP), Nash-sutcliffe coefficient of efficiency (Ef) and accuracy factor (Af). Comparison of the prediction results of the SVM models with experimental datapoints shows that the proposed SVM models have the potential to be used for force prediction applications.Copyright © 2012 by ASME
The rapid monitoring of structures using interdigital Lamb wave transducers

The use of interdigital PVDF transducers for the quick inspection of large, plate-like structures is discussed. The transducers are designed to excite a particular Lamb mode in the structure, the region of the structure that is insonified being controlled by the transducer design. An example is given of the monitoring of an aluminium plate by a single, circular transducer operating in pulse-echo mode, the a0 Lamb mode at a frequency of about 1 MHz being transmitted and received. The transducer is split into segments so that the angular location of a reflector can be defined, the radial location of the reflector being determined from the time of arrival of the echo.
Numerical Moonpool Modeling

The use of moonpools in offshore technology are normally related to the hull opening in drilling units with the objective to protect drilling equipment from environmental forces, and its design aims the minimum motion of the water inside the moonpool, avoiding water impacts when lowering an equipment. Several studies have been carried out to predict the water dynamics inside the moonpool. At most, analytical tools have been used with experimental results, to obtain a good evaluation of viscous effects. Another line of development uses the moonpools as a device to reduce motions of ships or oil platforms. In his context, the use of moonpools in monocolumn type platforms was studied during the development of the concept, through the partnership between PETROBRAS and University of Sao Paulo–USP. An alternative that became viable in the last years is the use of numerical methods to evaluate potencial parameters, being only necessary simple experiments to obtains viscous data to complete the model. This work, that is a continuation of articles about the issue written before, intends to consolidate the calculation method of moonpool to monocolumn units.Copyright © 2006 by ASME
The TCR/peptide/MHC complex with a superagonist peptide shows similar interface and reduced flexibility compared to the complex with a self-peptide

T-cell receptor (TCR) recognition of myelin basic protein (MBP) peptide presented by major histocompatibility complex (MHC) protein HLA-DR2a, one of the MHC class II alleles associated with multiple sclerosis, is highly variable. Interactions in the trimolecular complex between the TCR of MBP83-99-specific T cell clone 3A6 with the MBP-peptide/HLA-DR2a (abbreviated TCR/pMHC) lead to substantially different proliferative responses when comparing the wild-type decapeptide MBP90-99 and a superagonist peptide which differs mainly in the residues that point towards the TCR. Here we investigate the influence of the peptide sequence on the interface and intrinsic plasticity of the TCR/pMHC trimolecular and pMHC bimolecular complexes by molecular dynamics simulations. The intermolecular contacts at the TCR/pMHC interface are similar for the complexes with the superagonist and the MBP self-peptide. The orientation angle between TCR and pMHC fluctuates less in the complex with the superagonist peptide. Thus, the higher structural stability of the TCR/pMHC tripartite complex with the superagonist peptide, rather than a major difference in binding mode with respect to the self-peptide, seems to be responsible for the stronger proliferative response.
Dynamic performance of silicone dielectric elastomer actuators with bi-stable buckled beams

A significant limitation of large-scale dielectric electroactive polymers (DEAP) actuators is their slow and rate dependent dynamic response. We develop a procedure to characterize, model and test DEAP planar actuators with integrated bi-stable mechanisms. We describe a procedure to design the bi-stable element, a post-buckled slender beam, so as to improve the quasi-static performance of the actuator. The impact of the bi-stable mechanism on the dynamic performance of the actuator is studied by measuring its maximum planar peak-topeak displacement upon dynamic excitation. Surprisingly, the dynamic performance is strongly enhanced by the bi-stable mechanism. The frequency response flattens and becomes almost frequency independent up to the resonant frequency of the actuator. Moreover, a four-fold increase in active displacement stroke is achieved. The margin for further improvements is large, commensurated with the aims of the present research: namely the fabrication of large-scale, planar oscillating surfaces for turbulent flow control purposes.
Decision support model for energy‐efficient improvement of entire building stocks

Purpose – In recent years, steadily rising and ever‐changing energy prices have required the development of sustainable strategies to reduce the energy consumption of buildings. Measures to improve the energy efficiency of detached houses have already been implemented. This new procedure addresses the energy efficient modernization to entire building stocks of public authorities and therefore targets to meet a key niche issue.Design/methodology/approach – As result of literature research the demand for a strategic approach for energy efficient improvement was pointed out. The model framework refers to four main requirements for a new procedure within a comprehensive view of facilities management (FM), lifecycle orientation, efficient working processes, setting of objectives and monitoring of results. In addition the literature research recorded five main methods and tools which were utilized for the model development.Findings – The new constructed facility‐energy‐efficiency model (FEE‐model) supports the .
Potential side effects of directly Acting Antivirals (DAAs) after one and three months of treatment among EGYPTIAN elderly patients

Potential side effects of directly Acting Antivirals (DAAs) after one and three months of treatment among EGYPTIAN elderly patients Ahmed Abd Elrahim Ali, Reem M.S. Elbedewy, Ahmed Fouad Sherief, Ossama Ashraf,Hager Ahmed Shereen Moustafa Mousa 1-Geriatrics and Gerontology Department, Faculty of Medicine, Ain Shams University 2-Tropical Medicine Department, Faculty of Medicine, Ain Shams University 3-Internal Medicine Department, Faculty of Medicine, Ain Shams University
Mathematical modelling of geometric tolerance propagation, considering effects of datums

Abstract Every mechanical part is fabricated with variations in size and shape in the real world. Thus, tolerances are assigned to specify the tolerance zone corresponding to the allowable range of variation in the design shape within which the entire shape element must lie after the manufacturing process. Geometric tolerances constrain the size and the thickness of an individual shape element or its relative position and orientation with respect to the related datums. The effect of the tolerances given to the datums should be propagated to the orientation and the location tolerances in the proper order of precedence. This paper proposes a mathematical foundation for representing the propagation of geometric tolerances while considering the order of precedence of the datums. The effect caused by the tolerances of the datum can also be mathematically handled while considering the datum order of precedence.
Optical requirements and modeling of coupling devices for future far-infrared space missions

The next generation of space missions targeting far-infrared bands will require large-format arrays of extremely lownoise detectors. The development of Transition Edge Sensors (TES) array technology seems to be a viable solution for future mm-wave to Far-Infrared (FIR) space applications where low noise and high sensitivity is required. In this paper we concentrate on a key element for a high sensitivity TES detector array, that of the optical coupling between the incoming electromagnetic field and the phonon system of the suspended membrane. An intermediate solution between free space coupling and a single moded horn is where over-moded light pipes are used to concentrate energy onto multimoded absorbers. We present a comparison of modeling techniques to analyze the optical efficiency of such light pipes and their interaction with the front end optics and detector cavity.
Empirical Mode Decomposition-based Subtraction Techniques for 50 Hz Interference Reduction from Electrocardiogram

Abstract In general, most of the Biomedical signals such as Electrocardiogram (ECG), Electroencephalogram, and Electro-oculogram are nonstationary signals, suffers from different interferences like power line interference (PLI) and with other biomedical signals that gets added with it. Analysis of these signals means the extraction of useful information from the signal, and in this paper it is carried out using a new nonlinear and nonstationary data analysis method called Empirical Mode Decomposition (EMD). The key feature of this method is that it can decompose the signal into different IMFs and makes the analysis simple. Compared with other tools like Fourier analysis and wavelet methods, EMD is purely a data-driven and adaptive technique. Thus, it is well suited to analyze nonstationary signals like biosignals. This paper foregrounds an EMD-based, two-weight adaptive Alter structure to reduce the PLI in ECG signals. Two methodologies are studied based on EMD and the simulations are carried out in a MATLAB environment. The denoised signals are visually impressive and the methodologies are well suited for real-time implementation.
Adaptive computed reference computed torque control of flexible manipulators

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Pre-analytical quality control in hemostasis laboratories: visual evaluation of hemolysis index alone may cause unnecessary sample rejection

Abstract Background Visual inspection is the most widespread method for evaluating sample hemolysis in hemostasis laboratories. The hemolysis index (HI) was determined visually (visual index, VI) and measured on an ACL TOP 750 (IL Werfen) system with a hemolysis-icterus-lipemia index (HIL) module. These values were compared with those measured on clinical chemistry systems Unicel DXC600 and AU680 and with quantitation of free-hemoglobin (Hb) performed by a spectrophotometric measurement method (SMM). Methods The HI was measured in 356 sodium citrate plasma samples, 306 of which were visibly hemolyzed to varying degrees and 50 were not hemolyzed. The analytical performance of each method was evaluated. Results Linear regression analysis, calculated between SMM and the other systems in the study, returned coefficients of determination r2 = 0.853 (AU680), r2 = 0.893 (DXC600) and r2 = 0.917 (ACL TOP 750). An r2 = 0.648 was obtained for linear regression analysis between VI and ACL TOP 750. In addition, ACL TOP 750 showed an excellent correlation in multivariate analysis (r2 = 0.958), showing good sensitivity (0.939) and specificity (0.934) and a diagnostic accuracy of 94%. By comparison, DXC600 and AU680 showed coefficients of determination of 0.945 and 0.923, respectively. A cut-off was set at 0.15 g/L free-Hb, as determined by the automated method, such that any hemostasis samples measuring above this threshold should not be analyzed. Based on this criterion, samples were classified as accepted or rejected, and the number of samples discarded during VI or ACL TOP 750 measurements was compared. Conclusions This study confirmed that hemostasis laboratories should consider introducing an objective, automated and standardized method to check samples for hemolysis. By relying solely on visual inspection, up to 50% of samples could be unnecessarily rejected. The ACL TOP 750 system demonstrated a satisfactory analytical performance, giving results comparable to those of the reference method.