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Journal articles on the topic 'Instantaneous state vector'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Gong, Xuan, Di Chen Liu, Fei Fei Dong, and Bo Wang. "Study on 3-Phase PWM Rectifier Controlled by Direct Power." Applied Mechanics and Materials 325-326 (June 2013): 494–98. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.494.

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Based on the analysis on shortcomings of controlling strategies of direct power on the traditional 3-phase Boost-type PWM Rectifier through space vectors, a new controlling strategy is proposed in this paper. With this new strategy, the space vector is divided into 12 basic space vectors to form a new switching table. The instantaneous power controlling technology is realized through the control of instantaneous active power and reactive power by choosing the best switching state of PWM Rectifier. This new controlling strategy can put the input side unit power into operation, improve the effic

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Cohen, Robert A., and David M. Schultz. "Contraction Rate and Its Relationship to Frontogenesis, the Lyapunov Exponent, Fluid Trapping, and Airstream Boundaries." Monthly Weather Review 133, no. 5 (2005): 1353–69. http://dx.doi.org/10.1175/mwr2922.1.

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Abstract Although a kinematic framework for diagnosing frontogenesis exists in the form of the Petterssen frontogenesis function and its vector generalization, a similar framework for diagnosing airstream boundaries (e.g., drylines, lee troughs) has not been constructed. This paper presents such a framework, beginning with a kinematic expression for the rate of change of the separation vector between two adjacent air parcels. The maximum growth rate of the separation vector is called the instantaneous dilatation rate and its orientation is called the axis of dilatation. Similarly, a maximum de

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Yong, Yang. "Direct Instantaneous Power Control of Three-level Grid-connected." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 3 (2016): 1260. http://dx.doi.org/10.11591/ijece.v6i3.8193.

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Power electronic grid-connected inverters are widely applied as grid interface in renewable energy sources. This paper presents direct instantaneous power control of a three-phase three-level Neutral Point Clamped (NPC) grid-connected inverter in photovoltaic generation systems. The system consists of a PV array, DC/DC converter, three-level NPC LC filter and the grid. In order to achieve maximum power point tracking (MPPT), an adaptive perturb and observe MPPT is used. For balancing the neutral point (NP) voltage, the control scheme through proportional integral (PI) control according to the

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Yong, Yang. "Direct Instantaneous Power Control of Three-level Grid-connected." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 3 (2016): 1260. http://dx.doi.org/10.11591/ijece.v6i3.pp1260-1273.

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Power electronic grid-connected inverters are widely applied as grid interface in renewable energy sources. This paper presents direct instantaneous power control of a three-phase three-level Neutral Point Clamped (NPC) grid-connected inverter in photovoltaic generation systems. The system consists of a PV array, DC/DC converter, three-level NPC LC filter and the grid. In order to achieve maximum power point tracking (MPPT), an adaptive perturb and observe MPPT is used. For balancing the neutral point (NP) voltage, the control scheme through proportional integral (PI) control according to the

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Kromm, Andrey, Gennady Simakov, and Sergey Zhuk. "Highly dynamic observer of the magnetic state on the basis of the ventiled inductor motor." Proceedings of the Russian higher school Academy of sciences, no. 1-2 (June 19, 2020): 37–44. http://dx.doi.org/10.17212/1727-2769-2020-1-2-37-44.

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The article is devoted to the problem of developing highly dynamic flux observers for three-phase inductor motors. The synthesis of the flux observer is based on the analysis of the instantaneous powers of the motor stator by the vector control of drives. The observation algorithm lacks integral, differential and iterative methods of mathematics. The proposed observer algorithm is implemented in a vector-matrix form for its simplest integration into the modern vector control of electric drives. The observer provides stability and high precision in drives with direct torque control, in which th

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Gallardo-Alvarado, J., H. Orozco-Mendoza, and R. Rodríguez-Castro. "Finding the jerk properties of multi-body systems using helicoidal vector fields." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 11 (2008): 2217–29. http://dx.doi.org/10.1243/09544062jmes1030.

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In this contribution, the kinematic angular and linear third-order properties, also known as jerk analysis, of a multi-body system are determined applying the concept of helicoidal vector fields. The reduced acceleration state, or accelerator, of the body of interest, with respect to a reference frame, is obtained as the time derivative, via a helicoidal field, of the velocity state, also known as the infinitesimal twist. Following that trend, the reduced jerk state, or jerkor, is obtained as the time derivative of the accelerator. The computation of the instantaneous centre of jerk, with its

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Grachev, Vladimir, Mihail Fedotov, Aleksandr Grischenko, Fedor Bazilevskiy, and Aleksandr Sharapov. "Locomotive Diesel Gas-Air Tract Diagnostics with the Use of Intellectual Classifier." Bulletin of scientific research results, no. 2 (June 23, 2022): 124–40. http://dx.doi.org/10.20295/2223-9987-2022-2-124-140.

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Purpose: Efficiency increase of operational monitoring of technical state of gas-air tract (GAT) of a locomotive diesel, assessment of possibility of using locomotive regular measuring tools to monitor diesel GAT technical state; feasibility justification for expanding the list of GAT parameters that are monitored by locomotive board diagnostics. Methods: An intelligent classifier based on Support Vector Machine (SVM) algorithm is used to determine the current technical condition (TC) class of GAT. Training sample of 96 item volume for eight classes of GAT TC was formed using “Diesel-RK” softw

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Żur, K. K. "The Maximum Principle of Pontryagin in Control of Twolegged Robot Based on Human Walking System." International Journal of Applied Mechanics and Engineering 19, no. 2 (2014): 407–17. http://dx.doi.org/10.2478/ijame-2014-0027.

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Abstract In the paper a hypothesis about state equations of human gait is presented. Instantaneous normalized power developed by human muscles at particular joints of a leg is a control vector in state equations of the human walking system. The maximum principle of Pontryagin in analysis of dynamic human knee joint was presented. The discrete Hamilton function of a knee joint is similar to a discrete square function of normalized power developed by muscles at the knee joint. The results satisfy optimal conditions and could be applied in control of exoskeleton and DAR type robot.

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Teppa-Garran, Pedro, Diego Muñoz-de Escalona, and Javier Zambrano. "Liquid level tracking for a coupled tank system using quasi–lpv control." Ingenius, no. 33 (January 6, 2025): 15–26. https://doi.org/10.17163/ings.n33.2025.02.

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This article proposes a gain-scheduling procedure based on quasi-LPV modeling for a nonlinear coupled tank system to track the liquid level with zero steady-state error. The nonlinearities are directly represented by a parameter vector that varies within a bounded set constrained by the physical limits of the tank system levels. This approach enables accurate nonlinear system modeling using a linear parameter-varying model. State-feedback linear controllers are designed at the extreme vertices of the bounded set. The global controller is derived as the weighted average of local controller cont

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Li, Yu. "A Recognition Method of Athletes’ Mental State in Sports Training Based on Support Vector Machine Model." Journal of Electrical and Computer Engineering 2022 (June 21, 2022): 1–9. http://dx.doi.org/10.1155/2022/1566664.

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Athletes participate in competitive competitions, and the ultimate goal is to better display their personal competitive level in the competition so as to achieve the goal of defeating their opponents and winning the competition. In all types of competitions, most matches are instantaneous, and opportunities are fleeting. The instantaneous nature and fierce competition of sports competitions require athletes who participate in sports competitions to have a high psychological quality. It can be seen that the quality of the mental state directly determines the performance of the athletes in usual

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11

Shinnaka, Shinji. "Sensorless Vector Control of Induction Motors Using Minimum Dimensional Flux D-State Observer with Instantaneous Speed Estimation." IEEJ Transactions on Industry Applications 135, no. 3 (2015): 299–307. http://dx.doi.org/10.1541/ieejias.135.299.

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SHINNAKA, SHINJI. "Sensorless Vector Control of Induction Motors Using Minimum Dimensional Flux D-State Observer with Instantaneous Speed Estimation." Electrical Engineering in Japan 196, no. 1 (2016): 31–41. http://dx.doi.org/10.1002/eej.22831.

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Hyde, Milo W., and Olga Korotkova. "Electromagnetic Multi–Gaussian Speckle." Optics 3, no. 1 (2022): 19–34. http://dx.doi.org/10.3390/opt3010003.

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Generalizing our prior work on scalar multi-Gaussian (MG) distributed optical fields, we introduce the two-dimensional instantaneous electric-field vector whose components are jointly MG distributed. We then derive the single-point Stokes parameter probability density functions (PDFs) of MG-distributed light having an arbitrary degree and state of polarization. We show, in particular, that the intensity contrast of such a field can be tuned to values smaller or larger than unity. We validate our analysis by generating an example partially polarized MG field with a specified single-point polari

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Liu, Yue, and Guojun Tan. "Optimal Predictive Control Method of PWM Rectifiers Based on Artificial Intelligence." Mobile Information Systems 2021 (November 24, 2021): 1–9. http://dx.doi.org/10.1155/2021/3688228.

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Direct power control (DPC) of pulse width modulation (PWM) is often used to control the instantaneous power of rectifiers. The instantaneous power contains both grid voltage and current information, and its value is not affected by coordinate transformation. It is constant in steady state and reflects the DC control characteristics. However, the switching frequency of traditional DPC is not fixed, the DC voltage has static error, and the system fluctuates greatly. In this work, we introduce the concept of stator flux of the AC motor into the PWM rectifier. Combined with the space vector PWM (S

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PhD, Y. L. Xiong, D. J. Sanger, and D. R. Kerr. "Optimal Synthesis of Point Contact Restraint." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 206, no. 2 (1992): 95–103. http://dx.doi.org/10.1243/pime_proc_1992_206_103_02.

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The object of this paper is to develop a procedure that will allow the establishment of necessary and sufficient point contacts on a rigid body to ensure that the body has any desired state of instantaneous motion or restraint. The screw space and its sub-spaces are employed; these are vector spaces but not Euclidean spaces. The states of restraint and instantaneous motion of a body restrained by a system of screws of point contacts are specified by reciprocal sub-spaces of the screw space. This leads to a synthesis procedure for restraint of a rigid body by means of point contacts. The existe

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Eissa, Jaber Alreshidi, and Bilal Mohammad. "Characterizing Human Behaviours Using Statistical Motion Descriptor." Signal & Image Processing: An International Journal (SIPIJ) 10, no. 1 (2019): 15–25. https://doi.org/10.5281/zenodo.3369533.

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Identifying human behaviors is a challenging research problem due to the complexity and variation of appearances and postures, the variation of camera settings, and view angles. In this paper, we try to address the problem of human behavior identification by introducing a novel motion descriptor based on statistical features. The method first divide the video into N number of temporal segments. Then for each segment, we compute dense optical flow, which provides instantaneous velocity information for all the pixels. We then compute Histogram of Optical Flow (HOOF) weighted by the norm and quan

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Ayriyan, Alexander, David Blaschke, Juan Pablo Carlomagno, Gustavo A. Contrera, and Ana Gabriela Grunfeld. "Bayesian Analysis of Hybrid Neutron Star EOS Constraints Within an Instantaneous Nonlocal Chiral Quark Matter Model." Universe 11, no. 5 (2025): 141. https://doi.org/10.3390/universe11050141.

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We present a physics-informed Bayesian analysis of equation of state constraints using observational data for masses, radii and tidal deformability of pulsars and a generic class of hybrid neutron star equation of state with color superconducting quark matter on the basis of a recently developed nonlocal chiral quark model. The nuclear matter phase is described within a relativistic density functional model of the DD2 class and the phase transition is obtained by a Maxwell construction. We find the region in the two-dimensional parameter space spanned by the vector meson coupling and the scala

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Louie, Daniel C., Carla Kulcsar, Héctor A. Contreras-Sánchez, W. Jeffrey Zabel, Tim K. Lee, and Alex Vitkin. "Snapshot Imaging of Stokes Vector Polarization Speckle in Turbid Optical Phantoms and In Vivo Tissues." Photonics 12, no. 1 (2025): 59. https://doi.org/10.3390/photonics12010059.

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Significance: We present a system to measure and analyze the complete polarization state distribution of speckle patterns generated from in vivo tissue. Accurate measurement of polarization speckle requires both precise spatial registration and rapid polarization state acquisition. A unique measurement system must be designed to achieve accurate images of polarization speckle patterns for detailed investigation of the scattering properties of biological tissues in vivo. Aim and approach: This system features a polarization state analyzer with no moving parts. Two pixel-polarizer cameras allow

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19

Jian, Bijian, Chunbo Ma, Yixiao Sun, Dejian Zhu, Xu Tian, and Jun Ao. "Reconstruction of the Instantaneous Images Distorted by Surface Waves via Helmholtz–Hodge Decomposition." Journal of Marine Science and Engineering 11, no. 1 (2023): 164. http://dx.doi.org/10.3390/jmse11010164.

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Imaging through water waves will cause complex geometric distortions and motion blur, which seriously affect the correct identification of an airborne scene. The current methods main rely on high-resolution video streams or a template image, which limits their applicability in real-time observation scenarios. In this paper, a novel recovery method for the instantaneous images distorted by surface waves is proposed. The method first actively projects an adaptive and adjustable structured light pattern onto the water surface for which random fluctuation will cause the image to degrade. Then, the

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Kumsuwan, Yuttana, Watcharin Srirattanawichaikul, and Suttichai Premrudeepreechacharn. "Reduction of Torque Ripple in Direct Torque Control for Induction Motor Drives Using Decoupled Amplitude and Angle of Stator Flux Control." ECTI Transactions on Electrical Engineering, Electronics, and Communications 8, no. 2 (2009): 187–96. http://dx.doi.org/10.37936/ecti-eec.201082.172096.

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This paper proposes design and implementation of a direct torque controlled induction motor drive system. The method is based on decouple control of the amplitude and the angle of the stator flux reference for determining the reference stator voltage vector in generating the PWM output voltage for induction motors. The objective is to reduce electromagnetic torque ripple and stator flux droop which result in a decrease in current distortion at steady state. The proposed technique is based on the relationship between the instantaneous slip angular frequency and rotor angular frequency in adjust

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MAAOUI, CHOUBEILA, FREDERIC BOUSEFSAF, and ALAIN PRUSKI. "AUTOMATIC HUMAN STRESS DETECTION BASED ON WEBCAM PHOTOPLETHYSMOGRAPHIC SIGNALS." Journal of Mechanics in Medicine and Biology 16, no. 04 (2016): 1650039. http://dx.doi.org/10.1142/s0219519416500391.

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One of the goals of affective computing field is to provide to computers the ability to recognize automatically the affective state of the user in order to have more intuitive human–machine communication. This paper aims to detect automatically the stress user when he is interacting with computer. The developed system is based on instantaneous pulse rate (PR) signal extracted from imaging photoplethysmography (PPG). Seven features from time and frequency domain are extracted from PR signal and processed by learning pattern recognition systems. Two methods based on Support Vector Machine (SVM)

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Yanik, Arcan. "Absolute Instantaneous Optimal Control Performance Index for Active Vibration Control of Structures under Seismic Excitation." Shock and Vibration 2019 (November 12, 2019): 1–13. http://dx.doi.org/10.1155/2019/4207427.

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In this paper, an instantaneous optimal control performance index for active control of structures under seismic excitation is analytically proposed. Absolute velocity and absolute displacement terms are implemented to the conventional state vector terms and eventually to the resulting performance index expression. The seismic response reduction effectiveness of the proposed performance index is compared with the linear quadratic regulator control (LQR). For numerical verification of the performance index, an eight-story shear building with a fully active tendon controller system under unidire

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Panteleev, S. V., and A. N. Malashin. "Development of a relay-vector control system for a multi-phase semiconductor converter of electric energy." «System analysis and applied information science», no. 4 (January 28, 2021): 5–15. http://dx.doi.org/10.21122/2309-4923-2020-4-5-15.

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A system of relay-vector control of current in the circuit of a polyphase electric machine has been developed. For this, on the basis of the analysis of electromagnetic processes in a multiphase semiconductor converter of electrical energy, its discrete mathematical model was created, which takes into account the redistribution of electromagnetic energy by individual spatial harmonic components, depending on the number of phases. Using this mathematical model, a method for relay control of spatial harmonic components of the input current of the converter in the “tube” has been developed. The f

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Castro-Arvizu, Juan Manuel, Daniel Medina, Ralf Ziebold, Jordi Vilà-Valls, Eric Chaumette, and Pau Closas. "Precision-Aided Partial Ambiguity Resolution Scheme for Instantaneous RTK Positioning." Remote Sensing 13, no. 15 (2021): 2904. http://dx.doi.org/10.3390/rs13152904.

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The use of carrier phase data is the main driver for high-precision Global Navigation Satellite Systems (GNSS) positioning solutions, such as Real-Time Kinematic (RTK). However, carrier phase observations are ambiguous by an unknown number of cycles, and their use in RTK relies on the process of mapping real-valued ambiguities to integer ones, so-called Integer Ambiguity Resolution (IAR). The main goal of IAR is to enhance the position solution by virtue of its correlation with the estimated integer ambiguities. With the deployment of new GNSS constellations and frequencies, a large number of

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Panchenko, Maksim, Vladimir Grachev, Alexander Grishchenko, and Fedor Bazilevskiy. "Application of linear classifier for technical state identification of the diesel engine." Bulletin of scientific research results, no. 1 (March 28, 2019): 31–40. http://dx.doi.org/10.20295/2223-9987-2019-1-31-40.

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Objective: To analyze application possibilities of a linear classifier for identification of a diesel’s technical state by the crankshaft instantaneous speed signal. Methods: SVM linear classifier is used for identification of the current diesel technical state class by means of a pulse rate-of-turntransducer stress scanning image autocorrelation matrix of the diesel crankshaft. In order to provide the possibility of a visual display of results matrix dimensions were reduced to 22, informative parameters selection as well as classification quality control were carried out by means of 5-fold c

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BU, Wenshao, and Leilei Xu. "Direct Power Control Strategy of PWM Rectifier Based on Improved Virtual Flux-Linkage Observer." Journal of Control Science and Engineering 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/9376735.

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In order to achieve the low cost and high performance control of three-phase PWM rectifier, a direct power control (DPC) strategy based on a new-style virtual flux-linkage observer is proposed. The model of three-phase PWM rectifier and the principle of virtual flux-linkage vector control are introduced firstly. Then, in order to avoid the effect of integral initial value and cumulative deviation, three first-order low-pass filters are cascaded to replace the pure integral link; an improved virtual flux-linkage observer of three-phase power grid is presented. From the observed virtual flux-lin

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Pérez-Ibacache, Ricardo, Rodrigo Carvajal, Ramón Herrera-Hernández, Juan C. Agüero, and César A. Silva. "A Complex-Valued Stationary Kalman Filter for Positive and Negative Sequence Estimation in DER Systems." Mathematics 12, no. 12 (2024): 1899. http://dx.doi.org/10.3390/math12121899.

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In medium- and low-voltage three-phase distribution networks, the load imbalance among the phases may compromise the network voltage symmetry. Inverter-interfaced distributed energy resources (DERs) can contribute to compensating for such imbalances by sharing the required negative sequence current while providing active power synchronized with the positive sequence voltage. However, positive and negative sequences are conventionally defined in a steady state and are not directly observed from the instantaneous voltage and current measurements at the DER unit’s point of connection. In this art

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Negash, Hluf, and Shashank Bhatnagar. "Spectroscopy of ground and excited states of pseudoscalar and vector charmonium and bottomonium." International Journal of Modern Physics E 25, no. 08 (2016): 1650059. http://dx.doi.org/10.1142/s0218301316500592.

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In this paper, we calculate the mass spectrum, weak decay constants, two photon decay widths, and two-gluon decay widths of ground ([Formula: see text]) and radially excited ([Formula: see text]) states of pseudoscalar charmoniuum and bottomonium such as [Formula: see text] and [Formula: see text], as well as the mass spectrum and leptonic decay constants of ground state ([Formula: see text]), excited ([Formula: see text]) states of vector charmonium and bottomonium such as [Formula: see text], and [Formula: see text], using the formulation of Bethe–Salpeter equation under covariant instantane

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Liao, Wei Zhi. "The Automata Model of Interval Speed CPNs." Applied Mechanics and Materials 548-549 (April 2014): 1241–48. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.1241.

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Continuous Petri Nets(CPNs) has been a useful tool not only to approximate a discrete system but also to model a continuous process. In this paper, we consider a general CPNs----Interval speed CPNs(ICPNs). An approach to translate Interval speed CPNs to event clock automata is proposed. Since the instantaneous firing speed (IFS) vector is one of key parameters in behavior analysis for ICPN, an efficient way to determine the IFS of ICPNs was presented firstly. Then an algorithm of constructing evolution graph for ICPNs was developed, which offers all information for constructing automata for IC

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Ivanov, Evgen. "MATHEMATICAL MODEL OF THE VOLUMETRIC STRESS-STRAIN STATE OF GEARS WITH ARBITRARY TOOTH SHAPE." Bulletin of the National Technical University «KhPI» Series: Engineering and CAD, no. 2 (December 28, 2024): 70–75. https://doi.org/10.20998/2079-0775.2024.2.08.

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This paper presents an effective method for numerical analysis of the bulk stress-strain state of a gear of a real configuration. Namely, the determination of the bending stress fields in the gear teeth fillets with regard to geometric parameters. The methods of the classical theory of elasticity in a three-dimensional formulation with mixed boundary conditions for a region with a complex boundary surface are used. The solution is given in displacements. The components of the elastic displacement vector at an arbitrary point in the domain are determined, followed by the components of the stres

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Li, Jishun, Canbin Yin, Can Xu, Jun He, Pengju Li, and Yasheng Zhang. "Attitude Estimation of Spinning Space Targets Utilizing Multistatic ISAR Joint Observation." Remote Sensing 17, no. 13 (2025): 2263. https://doi.org/10.3390/rs17132263.

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When a space target malfunctions and is no longer controlled by its attitude control system, it usually tumbles in orbit and exhibits a slow spinning state. Accurately estimating the on-orbit attitude of spinning space targets is of vital importance for ensuring the operation of space assets. Moreover, it plays a significant role in tasks such as reentry observation and collision avoidance. Currently, most existing methods estimate the attitude of space targets by using a single inverse synthetic aperture radar (ISAR) for long-term observation. However, this approach not only requires a long o

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Dejima, Kazuhito, Osamu Nakabeppu, Yuto Nakamura, Tomohiro Tsuchiya, and Keisuke Nagasaka. "Three-point MEMS heat flux sensor for turbulent heat transfer measurement in internal combustion engines." International Journal of Engine Research 20, no. 7 (2018): 696–705. http://dx.doi.org/10.1177/1468087418770308.

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A heat flux sensor was developed with micro-electro-mechanical systems (MEMS) technologies for investigating turbulent heat transfer characteristics in engines. The sensor has three thin-film resistance temperature detectors (RTDs) of a square 315 µm on a side on a 900 µm diameter circle in rotational symmetry. The performances of the MEMS systems sensor were tested in an open combustion chamber and a laboratory engine. In the open chamber tests, it was revealed that the MEMS sensor can measure the wall heat fluxes reflecting flow states of gas phase. In addition, the noise was evaluated as 3.

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Swędrowski, Leon, Kazimierz Duzinkiewicz, Michał Grochowski, and Tomasz Rutkowski. "Use of Neural Networks in Diagnostics of Rolling-Element Bearing of the Induction Motor." Key Engineering Materials 588 (October 2013): 333–42. http://dx.doi.org/10.4028/www.scientific.net/kem.588.333.

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Bearing defect is statistically the most frequent cause of an induction motor fault. The research described in the paper utilized the phenomenon of the current change in the induction motor with bearing defect. Methods based on the analysis of the supplying current are particularly useful when it is impossible to install diagnostic devices directly on the motor. The presented method of rolling-element bearing diagnostics used indirect transformation, namely Clark transformation. It determines the vector of the spatial stator current based on instantaneous current measurements of the induction

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Vartanyan, David, Adam Burrows, and David Radice. "Temporal and angular variations of 3D core-collapse supernova emissions and their physical correlations." Monthly Notices of the Royal Astronomical Society 489, no. 2 (2019): 2227–46. http://dx.doi.org/10.1093/mnras/stz2307.

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Abstract We provide the time series and angular distributions of the neutrino and gravitational wave emissions of 11 state-of-the-art 3D non-rotating core-collapse supernova models and explore correlations between these signatures and the real-time dynamics of the shock and the proto-neutron star (PNS) core. The neutrino emissions are roughly isotropic on average, with instantaneous excursions about the mean inferred luminosity of as much as ±20 per cent. The deviation from isotropy is least for the ‘νμ’-type neutrinos and the lowest mass progenitors. Instantaneous temporal luminosity variatio

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Lee, Chang-Min, Byung-Gun Jung, and Jae-Hyuk Choi. "Experimental Study on Prediction for Combustion Optimal Control of Oil-Fired Boilers of Ships Using Color Space Image Feature Analysis and Support Vector Machine." Journal of Marine Science and Engineering 11, no. 10 (2023): 1993. http://dx.doi.org/10.3390/jmse11101993.

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The International Maritime Organization strives to improve the atmospheric environment in oceans and ports by regulating ship emissions of air pollutants and promoting energy efficiency. This study deals with the prediction of eco-friendly combustion in boilers to reduce air pollution emissions. Accurately measuring air pollutants from ship boilers in real-time is crucial for optimizing boiler combustion. However, using data obtained through an exhaust gas analyzer for real-time control is challenging due to combustion process delays. Therefore, a real-time predictive modeling approach is prop

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Saifi, R. "Implementation of a new flux rotor based on model reference adaptive system for sensorless direct torque control modified for induction motor." Electrical Engineering & Electromechanics, no. 2 (March 5, 2023): 37–42. http://dx.doi.org/10.20998/2074-272x.2023.2.06.

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Introduction. In order to realize an efficient speed control of induction motor, speed sensors, such as encoder, resolver or tachometer may be utilized. However, some problems appear such as, need of shaft extension, which decreases the mechanical robustness of the drive, reduce the reliability, and increase in cost. Purpose. In order to eliminate of speed sensors without losing. Several solutions to solve this problem have been suggested. Based on the motor fundamental excitation model, high frequency signal injection methods. The necessity of external hardware for signal injection and the ad

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R., Saifi. "Implementation of a new flux rotor based on model reference adaptive system for sensorless direct torque control modified for induction motor." Electrical Engineering & Electromechanics, no. 2 (March 5, 2023): 37–42. https://doi.org/10.20998/2074-272X.2023.2.06.

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<strong><em>Introduction.</em></strong><em> In order to realize an efficient speed control of induction motor, speed sensors, such as encoder, resolver or tachometer may be utilized. However, some problems appear such as, need of shaft extension, which decreases the mechanical robustness of the drive, reduce the reliability, and increase in cost. <strong>Purpose.</strong> In order to eliminate of speed sensors without losing. Several solutions to solve this problem have been suggested. Based on the motor fundamental excitation model, high frequency signal injection methods. The

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Jamel, Thamer M. "MOIDIEFIED VERSION OF ADJUSTED STEP SIZE LMS ALGORITHIM (MASSLMS) FOR ADAPTIVE LINEAR FIR EQUALIZER." Journal of Engineering 15, no. 03 (2009): 3907–18. http://dx.doi.org/10.31026/j.eng.2009.03.07.

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In this paper a Modified version of Adjusted Step Size Least Mean Square algorithm (MASSLMS) is proposed which overcome and avoid one of the drawback of the standard LMS and our previous proposed algorithm Adjusted Step Size Least Mean Square algorithm (ASSLMS). This drawback is the requirement of a statistical knowledge of the input signal prior to the starting training of the algorithm which is necessary to determine the fixed value of the maximum step size (i.e. the upper bound value) in the initialization stage of the ASSLMS algorithm. In this proposed algorithm an appropriate time varying

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Mądziel, Maksymilian, Artur Jaworski, Hubert Kuszewski, Paweł Woś, Tiziana Campisi, and Krzysztof Lew. "The Development of CO2 Instantaneous Emission Model of Full Hybrid Vehicle with the Use of Machine Learning Techniques." Energies 15, no. 1 (2021): 142. http://dx.doi.org/10.3390/en15010142.

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Road transport contributes to almost a quarter of carbon dioxide emissions in the EU. To analyze the exhaust emissions generated by vehicle flows, it is necessary to use specialized emission models, because it is infeasible to equip all vehicles on the road in the tested road sections with the Portable Emission Measurement System (PEMS). However, the currently used emission models may be inadequate to the investigated vehicle structure or may not be accurate due to the used macroscale. This state of affairs is especially related to full hybrid vehicles, since there are none of the microscale e

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Garcia, Jonathan W., Thomas M. Bartol, and Terrence J. Sejnowski. "Multiscale modeling of presynaptic dynamics from molecular to mesoscale." PLOS Computational Biology 18, no. 5 (2022): e1010068. http://dx.doi.org/10.1371/journal.pcbi.1010068.

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Chemical synapses exhibit a diverse array of internal mechanisms that affect the dynamics of transmission efficacy. Many of these processes, such as release of neurotransmitter and vesicle recycling, depend strongly on activity-dependent influx and accumulation of Ca2+. To model how each of these processes may affect the processing of information in neural circuits, and how their dysfunction may lead to disease states, requires a computationally efficient modelling framework, capable of generating accurate phenomenology without incurring a heavy computational cost per synapse. Constructing a p

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Hristozova, Lilia, Michael Klaas, and Wolfgang Schröder. "Multi-Scale Flow Estimation Within Stereoscopic PIV Processing Based On Deep Learning." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 21 (July 8, 2024): 1–10. http://dx.doi.org/10.55037/lxlaser.21st.65.

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Classical methods of particle-image velocimetry (PIV) based on state-of-the-art cross-correlation algorithms constitute a spatial filtering operation that leads to a loss of spatial resolution of the estimated velocity fields. This is associated with numerous limitations, e.g., when it comes to aligning high-fidelity numerical simulations, since the detection of small turbulent scales is often precluded. An optical flow neural network adapted for PIV processing, called RAFT-PIV, can overcome the drawback of reduced spatial resolution while maintaining the reliability and robustness of the clas

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Liu, He, and Wang Ya-Jun. "DPC of Cross-compensated Virtual Flux Double Switch Table." Journal of Electrical Engineering and Automation 3, no. 4 (2022): 305–21. http://dx.doi.org/10.36548/jeea.2021.4.005.

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Aiming at the problems of large power ripple, high harmonic components and DC bias on the AC side of the three-phase voltage rectifier Direct Power Control (DPC), as well as the shortcomings of the voltage output of the DC side busbar, the direct power control method of the cross-compensated virtual flux double switch meter has been proposed. The virtual flux can realize the sensorless mode on the input side of the circuit to reduce the high harmonic, even if the first-order low-pass filter is used to replace the integration region, there is still some error. On this basis, the two filters are

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Medouce, Houssam Eddine, and Hocine Benalla. "Predictive Approach for Power Quality Improvement Based Direct Power Control." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 2 (2018): 668. http://dx.doi.org/10.11591/ijpeds.v9.i2.pp668-678.

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The extensive use of non-linear loads in industry becomes increasingly a serious problem that affects the quality of energy delivered to customers. Therefore, the shunt active power filter (SAPF) has emerged as an important industrial tool to eliminate induced harmonic currents and compensating of reactive power. This paper proposes an improved control configuration for SAPF based on a modern technique called predictive direct power control (Predictive-DPC). The principle of this control is based on the direct regulation of the instantaneous active and reactive powers to guarantee a good energ

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Benmohamed, F. E., I. K. Bousserhane, A. Kechich, B. Bessaih, and A. Boucheta. "New MRAS secondary time constant tuning for vector control of linear induction motor considering the end-effects." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 35, no. 5 (2016): 1685–723. http://dx.doi.org/10.1108/compel-07-2015-0263.

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Purpose The end-effects is a well-recognized phenomenon occurring in the linear induction motor (LIM) which makes the analysis and control of the LIM with good performance very difficult and can cause additional significant non-linearities in the model. So, the compensation of parameters uncertainties due to these effects in the control system is very necessary to get a robust speed control. The purpose of this paper is to propose a new technique of LIM end-effects estimation using the inverse rotor time constant tuning in order to compensate the flux orientation error in the indirect field-or

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Baba, Galadima Agaie, and Amin Norsarahaida. "The Effect of Water Hammer on Pressure Oscillation of Hydrogen Natural Gas Transient Flow." Applied Mechanics and Materials 554 (June 2014): 251–55. http://dx.doi.org/10.4028/www.scientific.net/amm.554.251.

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The unexpected closing of a control valve or pumping, which can be planned or accidental could lead to pressure oscillation commonly known as water hammer. Pressure waves oscillation in the fluid flow interaction leads to unsteady state phenomenon. Numerical computation on transient flow model of hydrogen natural gas mixture (HCNG) in a pipeline where different types of valves are considered for effective delivery and safety. Reduced order modeling (ROM) technique is employed in the transient analysis of high pressured HCNG in a short pipe. The flow is governed by a system of Euler equations t

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Shirly, A. R. Danila, M. V. Suganyadevi, R. Ramya, I. Arul Doss Adaikalam, and P. Muthukumar. "Computation of an Effective Hybrid DFA-SVM Approach Aimed at Adaptive PV Power Management." WSEAS TRANSACTIONS ON POWER SYSTEMS 19 (July 30, 2024): 276–84. http://dx.doi.org/10.37394/232016.2024.19.25.

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Predominantly focussed in environmental conditions that are dynamic in nature the energy harnessed from the photovoltaic systems has to be maintained at high efficiency for which maximum power has to be extracted so a novel hybrid DFA-SVM control has been implemented using SEPIC converter. There are many algorithms to perform this function mentioned but in order to track the power at a faster rate and to avoid oscillations at the settling peak point this new methodology has been implemented. In this paper the novel algorithm used to track the peak power is Dragon Fly Algorithm-Support Vector M

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Lai, Chris C. K., and Scott A. Socolofsky. "The turbulent kinetic energy budget in a bubble plume." Journal of Fluid Mechanics 865 (March 1, 2019): 993–1041. http://dx.doi.org/10.1017/jfm.2019.66.

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We present the turbulent kinetic energy (t.k.e.) budget of a dilute bubble plume in its asymptotic state. The budget is derived from an experimental dataset of bubble plumes formed inside an unstratified water tank. The experiments cover both the adjustment phase and asymptotic state of the plume. The diameters $d$ of air bubbles are in the range 1–4 mm and the air void fraction $\unicode[STIX]{x1D6FC}_{g}$ is between 0.7 % and 1.8 %. We measured the three components of the instantaneous liquid velocity vector with a profiling acoustic Doppler velocimeter. From the experiments, we found the fo

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Wilson, James H. "The QED-physical theory of electron spin and quantum entanglement." Physics Essays 35, no. 1 (2022): 5–14. http://dx.doi.org/10.4006/0836-1398-35.1.5.

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The QED-Physical (QED-P) theory described in four previous papers [J. H. Wilson, Phys. Essays 28, 1 (2015); 29, 402 (2016); 31, 59 (2018); 34, 17 (2021)] is combined with QED into a single theory in this paper, since both are based on the same Dirac Equation four current c(α,I). QED couples this four-vector with an external electromagnetic (EM) field and uses covariant perturbation theory to produce results that are very accurate computationally [M. L. Eides et al., Phys. Rep. 342, 63 (2001)], except for the electron self-energy, which is infinite. The reason for QED’s accuracy is its Dirac eq

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Freeman, Walter J., and Linda J. Rogers. "Fine Temporal Resolution of Analytic Phase Reveals Episodic Synchronization by State Transitions in Gamma EEGs." Journal of Neurophysiology 87, no. 2 (2002): 937–45. http://dx.doi.org/10.1152/jn.00254.2001.

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The analytic signal given by the Hilbert transform applied to an electroencephalographic (EEG) trace is a vector of instantaneous amplitude and phase at the temporal resolution of the digitizing interval (here 2 ms). The transform was applied after band-pass filtering for extracting the gamma band (20–80 Hz in rabbits) to time series from up to 64 EEG channels recorded simultaneously from high-density arrays giving spatial “windows” of 4 × 4 to 6 × 6 mm onto the visual, auditory, or somatosensory cortical surface. The time series of the analytic phase revealed phase locking for brief time segm

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Ray, Argha, and Anjali Kaushik. "State transgression on electronic expression: is it for real?" Information & Computer Security 25, no. 4 (2017): 382–401. http://dx.doi.org/10.1108/ics-03-2016-0024.

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Purpose Cyberspace is a virtual environment where instantaneous communications are initiated and consumed using computer networks without any natural or artificial boundaries. These communications are not only an exchange of information but also a catharsis on the socio-political environment of the real world. This explosion of electronic expression is often detrimental to the traditional secretive maneuvers of nation states and the exercise of its power. Unable to come to terms with the new reality nation states through legislative action or otherwise attempt to assert its sovereignty in the

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