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Journal articles on the topic 'Dq-theory'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Kumar, Mahender, M. A. Uqaili, Z. A. Memon, and Bhagwan Das. "Mathematical Modeling of THD Mitigation Using HAPF for UPS System with Experimental Analysis via Hybrid Interface of Optical USB and Power Quality Meter." Mathematical Problems in Engineering 2021 (September 29, 2021): 1–15. http://dx.doi.org/10.1155/2021/3981287.

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This paper discusses a novel analysis scheme based on the hybrid interface of Optical USB and Power Quality Meter for measuring Total Harmonic Distortion (THD) that exists in the Uninterruptable Power Supply (UPS) system and connected load. The designed hybrid interface experimentally analyzes the power quality and harmonics of the Uninterrupted Power Supply (UPS) system, and mitigation is proposed with the proposed Single-Phase Hybrid Active Power Filter (HAPF) based on instantaneous Power Theory (PQ) with hysteresis control technique and synchronous frame reference (DQ) with hysteresis contr

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2

ZHANG, JUN, YONGYU ZHENG, and RUIBAO TAO. "TEMPERATURE DEPENDENCE OF NEMATIC ORDER PARAMETER NEAR TRANSITION." International Journal of Modern Physics B 16, no. 27 (2002): 4105–10. http://dx.doi.org/10.1142/s0217979202014814.

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By means of Tao, Sheng and Lin's generized molecular field theory, the temperature dependence of the order parameter dQ/dT|Tchas been calculated. All the parameters in the calculation are fixed by experiments like the previous paper. There is no adjustable parameter. Our calculated value of dQ/dT|Tc~ 1%K-1agree well with experiments. The new puzzle of small value of dQ/dT|Tcdoes not existence.

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3

Pauly, Daniel, and Johannes Müller. "Fick’s Diffusion Laws and Scaling of the Gill Surface Area and Oxygen Uptake in Fish." Fishes 10, no. 5 (2025): 233. https://doi.org/10.3390/fishes10050233.

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The oxygen consumption of adult fish (Q) is proportional to their body weight (W) raised to a power, estimated as the slope (dQ) of a linear regression of log(Q) vs. log(W). Similarly, the gill surface area of adult fish (GSA) is proportional to W raised to the power dG, as also estimated via a log-log linear proportional to their surface area. Moreover, because of Fick’s laws of diffusion, dQ should be at least similar to dG. Recently, the claim has been made that non-zero differences between dQ and dG invalidate the Gill-Oxygen Limitation Theory (GOLT), which suggests that the O2 supplied by

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4

Sáez, Carlos, Oscar Zurriaga, Jordi Pérez-Panadés, Inma Melchor, Montserrat Robles, and Juan M. García-Gómez. "Applying probabilistic temporal and multisite data quality control methods to a public health mortality registry in Spain: a systematic approach to quality control of repositories." Journal of the American Medical Informatics Association 23, no. 6 (2016): 1085–95. http://dx.doi.org/10.1093/jamia/ocw010.

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Abstract Objective To assess the variability in data distributions among data sources and over time through a case study of a large multisite repository as a systematic approach to data quality (DQ). Materials and Methods Novel probabilistic DQ control methods based on information theory and geometry are applied to the Public Health Mortality Registry of the Region of Valencia, Spain, with 512 143 entries from 2000 to 2012, disaggregated into 24 health departments. The methods provide DQ metrics and exploratory visualizations for (1) assessing the variability among multiple sources and (2) mon

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5

Mörée, Gustav, and Mats Leijon. "Simplified Current-Equivalent Circuit Models of Synchronous Reluctance Machines and Salient Pole Synchronous Machines Considering the Reluctance Torque." Energies 17, no. 5 (2024): 1015. http://dx.doi.org/10.3390/en17051015.

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This paper describes a simplified one-phase equivalent circuit model of three-phase salient pole synchronous machines and synchronous reluctance machines. The model represents the pole saliency as a susceptance, with a magnitude based on the pole saliency and a phase angle based on twice the load angle. The reluctance torque itself is then modeled equivalent to a conductance. The model is made as an extension to Norton equivalents, where the internal inductance is connected as a shunt. This approach shares similarities to the magnetization shunt branch in circuit models of transformers and ind

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Kishida, Ryo, Shosuke Ito, Manickam Sugumaran, Ryan Lacdao Arevalo, Hiroshi Nakanishi, and Hideaki Kasai. "Density Functional Theory-Based Calculation Shed New Light on the Bizarre Addition of Cysteine Thiol to Dopaquinone." International Journal of Molecular Sciences 22, no. 3 (2021): 1373. http://dx.doi.org/10.3390/ijms22031373.

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Two types of melanin pigments, brown to black eumelanin and yellow to reddish brown pheomelanin, are biosynthesized through a branched reaction, which is associated with the key intermediate dopaquinone (DQ). In the presence of l-cysteine, DQ immediately binds to the –SH group, resulting in the formation of cysteinyldopa necessary for the pheomelanin production. l-Cysteine prefers to bond with aromatic carbons adjacent to the carbonyl groups, namely C5 and C2. Surprisingly, this Michael addition takes place at 1,6-position of the C5 (and to some extent at C2) rather than usually expected 1,4-p

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7

Wang, Yu Feng, Guang Ye Liu, Xiao Guo Lv, and Zhong Chu Wang. "The Simulation of APF Based on Three-Phase VSI." Applied Mechanics and Materials 397-400 (September 2013): 1901–5. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1901.

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In order to restrain harmonic pollution of power grid, the structure and control strategy of APF was researched. The structural parameters and method of direct current control of the most widely used APF with three-phase VSI was discussed. Decoupling control of active and reactive current on the dq plane was realized by dq transforming. Harmonic of load current was detected by Ip-Iq algorithm based on the instantaneous reactive power theory. Double closed-loop control was applied and PWM drive signals of IGBT were got through comparison of triangle wave and modulation wave. The simulation resu

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8

Abdellahi, Ramin, Mohsen Esmaeili, Mirsami Yeganli, Ali Mokhtarian, Roohallah Alizadehsani, and Paweł Pławiak. "Free vibration characteristics of trapezoidal nanoplate rested on viscoelastic substrate with arbitrary boundary conditions using differential quadrature method." PLOS ONE 20, no. 3 (2025): e0316210. https://doi.org/10.1371/journal.pone.0316210.

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This study investigates the free vibration analysis of trapezoidal nanoplate resting on viscoelastic foundation based on first order shear deformation theory (FSDT) incorporating nonlocal elasticity theory, using differential quadrature (DQ) method. The nanoplate’s governing equations of motion together with various associated boundary conditions have been discretized applying a mapping DQ method in the spatial domain. Then the complex natural frequencies of the trapezoidal nanoplates obtained by solving the eigen value matrix equation. Verification of the study is confirmed by comparing its n

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9

Nilesh R. More and Sadashiv G. Dapke. "On Fixed Point Theorems in Dislocated Quasi Metric Spaces." International Journal of Scientific Research in Science, Engineering and Technology 12, no. 4 (2025): 185–89. https://doi.org/10.32628/ijsrset2512414.

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The aim of this paper is to establish new fixed point results for certain classes of mappings in the setting of dislocated quasi-metric (dq-metric) spaces by utilizing the concept of orbits around a point. The study focuses on relaxing the conventional completeness assumptions and instead applies orbital completeness, which provides a broader and more flexible framework for analysis. We extend and generalize existing fixed point theorems by considering various contractive conditions under orbital continuity. These generalizations contribute to the ongoing development of fixed point theory in n

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10

Nandagopal, V., T. S. Balaji Damodhar, P. Vijayapriya, and A. Thamilmaran. "Improving Power Quality by DSTATCOM Based DQ Theory with Soft Computing Techniques." Intelligent Automation & Soft Computing 36, no. 2 (2023): 1315–29. http://dx.doi.org/10.32604/iasc.2023.032039.

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11

Lin, Faa-Jeng, Syuan-Yi Chen, Wei-Ting Lin, and Chih-Wei Liu. "An Online Parameter Estimation Using Current Injection with Intelligent Current-Loop Control for IPMSM Drives." Energies 14, no. 23 (2021): 8138. http://dx.doi.org/10.3390/en14238138.

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An online parameter estimation methodology using the d-axis current injection, which can estimate the distorted voltage of the current-controlled voltage source inverter (CCVSI), the varying dq-axis inductances, and the rotor flux, is proposed in this study for interior permanent magnet synchronous motor (IPMSM) drives in the constant torque region. First, a d-axis current injection-based parameter estimation methodology considering the nonlinearity of a CCVSI is proposed. Then, during current injection, a simple linear model is developed to model the cross- and self-saturation of the dq-axis

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12

HARIKUMAR, E. ""SCHWINGER MODEL" ON THE FUZZY SPHERE." Modern Physics Letters A 25, no. 37 (2010): 3151–67. http://dx.doi.org/10.1142/s0217732310034079.

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In this paper, we construct a model of spinor fields interacting with specific gauge fields on the fuzzy sphere and analyze the chiral symmetry of this "Schwinger model". In constructing the theory of gauge fields interacting with spinors on the fuzzy sphere, we take the approach that the Dirac operator Dq on the q-deformed fuzzy sphere [Formula: see text] is the gauged Dirac operator on the fuzzy sphere. This introduces interaction between spinors and specific one-parameter family of gauge fields. We also show how to express the field strength for this gauge field in terms of the Dirac operat

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13

Zhao, Jianbo, and You-Qi Tang. "Natural frequencies of axially moving beams with coupled longitudinal–transversal vibrations: Comparison of three methods." Journal of Physics: Conference Series 2964, no. 1 (2025): 012034. https://doi.org/10.1088/1742-6596/2964/1/012034.

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Abstract This paper analyzes the coupled vibration problem of viscoelastic beams in axial motion using the Euler-Bernoulli beam theory. A physical model is established that includes parameters such as density, cross-sectional area, elastic modulus, viscoelastic coefficient, support length, and initial axial tension. Based on the generalized Hamiltonian principle, a set of motion equations in coupled transverse and longitudinal forms is derived. The equations are simplified using dimensionless variables and applying simply supported boundary conditions. Numerical simulations are conducted using

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14

Hou, Rui, and Cai Ping Li. "Study of Modified Sliding Mode Control Strategy for STATCOM with LCL Filter." Advanced Materials Research 383-390 (November 2011): 543–47. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.543.

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This paper studies the control strategy of STATCOM with LCL filter. The STATCOM sixth orders differential equations in dq coordinate separate to two parts. Invert system theory deals with their uncoupling and nonlinearity. Then the sliding mode control strategy is used to the differential equations. Finally simulation results show validity and effectiveness of the design by comparing with PI controller.

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15

Srivastava, Alok M., Mikhail G. Brik, Samuel J. Camardello, Holly A. Comanzo, and Florencio Garcia-Santamaria. "Optical Spectroscopy and Crystal Field Studies of the Mn4+ Ion (3d3) in the Double Perovskite NaLaMgTeO6." Zeitschrift für Naturforschung B 69, no. 2 (2014): 141–49. http://dx.doi.org/10.5560/znb.2014-3259.

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The spectroscopic properties of the Mn4+ ion (3d3) in the double perovskite NaLaMgTeO6 are reported in this work. Evidence is presented for the occupation by the Mn4+ ion of both the six coordinated Mg2+ and Te6+ sites in the host structure. The Mn4+ energy levels are calculated using the exchange charge model of crystal field theory for both occupied sites. The results of our calculations yield the crystal field splitting and Racah parameters of Dq = 2008 cm−1, B = 790 cm−1, C =2881 cm−1, with C/B=3:65 (Mg2+ site) and Dq=2008 cm−1, B=790 cm−1,C =2949 cm−1, with C/B = 3:73 (Te6+ site). A cross

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16

De Rosa, Maria Anna, Maria Lippiello, and Stefania Tomasiello. "Differential quadrature solutions for the nonconservative instability of a class of single-walled carbon nanotubes." Engineering Computations 35, no. 1 (2018): 251–67. http://dx.doi.org/10.1108/ec-12-2016-0427.

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Purpose The purpose of the present paper is to investigate the nonconservative instability of a single-walled carbon nanotube (SWCNT) with an added mass through nonlocal theories. The governing equations are discretized by means of the differential quadrature (DQ) rules, as introduced by Bellman and Casti. DQ rules have been largely used in engineering and applied sciences. Recently, they were applied to enhance some numerical schemes, such as step-by-step integration schemes and Picard-like numerical schemes. Design/methodology/approach In the present paper, the DQ rules are used to investiga

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Pedra, Joaquín, Luis Sainz, and Lluís Monjo. "DC Admittance Model of VSCs for Stability Studies in VSC-HVDC Systems." Energies 16, no. 14 (2023): 5457. http://dx.doi.org/10.3390/en16145457.

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High-voltage direct current (HVDC) systems linked to AC grids with converters are promising energy transmission systems. These systems present complex AC- and DC-side dynamic interactions. Impedance-based stability studies have recently been proposed to assess DC-side dynamics from DC-side characterization of voltage source converters (VSCs) considering AC-side dynamics. However, the existing approaches used for stability studies in VSC-HVDC systems do not completely model VSCs because they do not consider together the VSC delay, the grid voltage feedforward filter, and all the d- and q-refere

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18

Petkova, Petya. "TETRAHEDRAL COMPLEX OF Cr3+ AND Cr4+ IONS IN Bi12SiO20." Journal scientific and applied research 2, no. 1 (2012): 58–65. http://dx.doi.org/10.46687/jsar.v2i1.44.

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Absorption measurement is taken in the visible spectral region (650 – 1300 nm). The dopants Cr3+ and Cr4+ ions occupy the tetrahedral sites in the crystal lattice of doped sillenite. The energy level structure of these ions in Bi12SiO20:Cr (BSO:Cr) are presented. The Dq-, B- and C-parameters of the crystal field theory for the Cr3+ and Cr4+ ions were obtained. The spin-coupling energy is also calculated for the chromium ions.

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19

Setoodeh, AliReza, Morteza Derahaki, and Navid Bavi. "DQ thermal buckling analysis of embedded curved carbon nanotubes based on nonlocal elasticity theory." Latin American Journal of Solids and Structures 12, no. 10 (2015): 1901–17. http://dx.doi.org/10.1590/1679-78251894.

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20

Trapanese, Marco. "A dq axis theory of the magnetic, thermal, and mechanical properties of Curie motor." Journal of Applied Physics 109, no. 7 (2011): 07E706. http://dx.doi.org/10.1063/1.3562505.

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21

Ghorbanpour Arani, A., V. Atabakhshian, A. Loghman, A. R. Shajari, and S. Amir. "Nonlinear vibration of embedded SWBNNTs based on nonlocal Timoshenko beam theory using DQ method." Physica B: Condensed Matter 407, no. 13 (2012): 2549–55. http://dx.doi.org/10.1016/j.physb.2012.03.065.

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BRIK, M. G. "ON THE CRYSTAL FIELD ANALYSIS OFCr4+ENERGY LEVELS INRb2CrF6." Modern Physics Letters B 20, no. 17 (2006): 1007–14. http://dx.doi.org/10.1142/s0217984906011712.

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Optical absorption spectrum of Cr4+ion in Rb2CrF6is analyzed using the exchange charge model of crystal field theory. The crystal field parameters acting on the optical electrons of Cr4+are calculated using the crystal structure data; a good agreement between the calculated and observed energy levels of Cr4+in the title host is demonstrated. The crystal field strength Dq=2159 cm-1and Racah parameters B=639 cm-1, C=3605 cm-1were evaluated from the experimental spectrum.

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Bridges, Thomas J. "Stability of periodic solutions near a collision of eigenvalues of opposite signature." Mathematical Proceedings of the Cambridge Philosophical Society 109, no. 2 (1991): 375–403. http://dx.doi.org/10.1017/s0305004100069838.

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AbstractSome general observations about stability of periodic solutions of Hamiltonian systems are presented as well as stability results for the periodic solutions that exist near a collision of pure imaginary eigenvalues. Let I = ∮ p dq be the action functional for a periodic orbit. The stability theory is based on the surprising result that changes in stability are associated with changes in the sign of dI / dw, where w is the frequency of the periodic orbit. A stability index based on dI / dw is defined and rigorously justified using Floquet theory and complete results for the stability (a

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24

Goulding, Jack, and Sharifah Syed-Khuzzan. "A study on the validity of a four-variant diagnostic learning styles questionnaire." Education + Training 56, no. 2/3 (2014): 141–64. http://dx.doi.org/10.1108/et-11-2012-0109.

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Purpose – The purpose of this paper is to examine the use, construct, and pervasiveness of learning styles theory. Whilst extant literature has provided educational theorists with a temporal landscape for promoting or critiquing the surfeit of “models” and “diagnostic tools”, there has been little empirical research evidence undertaken on the adoption and adaptation of learning styles in the e-Learning environment, especially in respect of personalised learning environments (PLEs). In this respect, evidence identifies that the more thoroughly instructors understand the differences in learning

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Hinostroza, Carlos Leonardo A., João Pedro C. Silveira, Marcelo Vinicius De Paula, Pedro José Dos Santos Neto, Ernesto Ruppert Filho, and Tárcio André S. Barros. "Ancillary Services to Mitigate Non-linear and Unbalanced Load Based on CPT Using a DFIG Power Plant." Eletrônica de Potência 29 (December 4, 2024): e202453. https://doi.org/10.18618/rep.e202453.

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The increase of renewable energy sources and non-linear loads on the utility grid introduces challenges in maintaining the nominal conditions of the utility grid. A viable approach to addressing some of these challenges is to utilize renewable energy conversion systems that accomplish supplementary functions in addition to supplying active power. This paper presents the implementation of ancillary services to mitigate non-linear and unbalanced loads using a single Doubly Fed Induction Generation (DFIG) power plant. For this, the Conservative Power Theory (CPT) is used to provide three types of

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Zhang, Bo, Cheng Li, Limin Zhang, and Feng Xie. "Size-Dependent Free Vibration of Non-Rectangular Gradient Elastic Thick Microplates." Symmetry 14, no. 12 (2022): 2592. http://dx.doi.org/10.3390/sym14122592.

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The free vibration of isotropic gradient elastic thick non-rectangular microplates is analyzed in this paper. To capture the microstructure-dependent effects of microplates, a negative second-order gradient elastic theory with symmetry is utilized. The related equations of motion and boundary conditions are obtained using the energy variational principle. A closed-form solution is presented for simply supported free-vibrational rectangular microplates with four edges. A C1-type differential quadrature finite element (DQFE) is applied to solve the free vibration of thick microplates. The DQ rul

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27

Ram, Kripal, and Kumar Yadav Awadhesh. "EPR, Optical Absorption and Superposition Model Studies of Cr3+ Doped Cesium Tetrabromozincate." Boson Journal of Modern Physics 1, no. 1 (2015): 26–38. https://doi.org/10.5281/zenodo.3969708.

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Electron paramagnetic resonance (EPR) study of Cr3+ doped cesium tetrabromozincate (CTBZ) single crystal is done at room temperature. The hyperfine structure for Cr53 isotope is also obtained. Two magnetically inequivalent sites for Cr3+ are observed. The spin Hamiltonian parameters are evaluated as: D = 234×10-4 cm-1 , E = 69×10-4 cm1 , g = 2.0104, A = 80×10-4 cm-1 for site I and D = 235×10-4 cm-1 , E = 70×10-4 cm-1 , g = 2.0061, A = 82×10-4 cm-1 for site II, respectively. The optical absorption spectra are recorded at room temperature. The energy values of

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Sun, Lei, Yu Ning Wang, Chen Gu, and Yi Man Liu. "The Design of Direct-Drive Wind Generation Grid Side PWM Converter Based on LCL Filter." Applied Mechanics and Materials 472 (January 2014): 265–70. http://dx.doi.org/10.4028/www.scientific.net/amm.472.265.

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This paper gives systematically study on grid-side converter with LCL filter for doubly-fed induction generator in wind power. This paper adopts the parameters of the PI-based controller that is already used for the L-filter-based active rectifier. On the basis of model in the dq coordinate system, the paper proposes a double-closed-loop control strategy. Then the simulation model of PWM rectifier is established in the MATLAB/SIMULINK environment. According to the articles theory imitation of the real system design with good dynamic and static performance.

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Farady, Rustono Marta, Hana Panggabean, Monica Sri Sunaringsih, Fathul Qorib, and Nurlina Bangun. "The Ideological Upheaval of Stakeholders in Online News about AI as CEO." Nyimak: Journal of Communication 9, no. 1 (2025): 98. https://doi.org/10.31000/nyimak.v9i1.12806.

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In today's digital age, a more critical approach is needed to understand the social and ethical implications of Artificial Intelegence (AI) on future corporate governance, including human oversight in the application of AI itself. The aim of this study is to analyze how three international media outlets, DQ India, The Independent and Business Insider, portray the adoption of AI-based Chief Executive Officer or abbriviated as CEO's in the context of corporate governance. Using Entman's framing analysis, it identifies the themes, narratives and ideologies in the news about AI in corporate govern

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Chen, Yijing, Zhonghuan Su, Weihua Xie, Hui Yao, and Chunhua Li. "Research on modular multi-level converter control based on passivity theory." Journal of Physics: Conference Series 2703, no. 1 (2024): 012082. http://dx.doi.org/10.1088/1742-6596/2703/1/012082.

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Abstract All In view of the poor dynamic performance of the conventional PI control method in modular multilevel converter (MMC) systems, an up-to-date control strategy using passive theory is proposed. First, the topology of the system and its mathematical model are presented, then its Euler-Lagrange (EL) model is developed and its passivity is proved. Next, the dq-axis component of the current is chosen as the state variable to derive the passivity-based control (PBC) law and from this, the current passivity controller is designed. Simulation shows that compared with conventional PI control,

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Wang, Xuejie, Peng Ye, Yi Zhao, et al. "Simulation analysis of VSC reactive power compensation device." Journal of Physics: Conference Series 2401, no. 1 (2022): 012043. http://dx.doi.org/10.1088/1742-6596/2401/1/012043.

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Abstract Reactive power compensators based on three-phase voltage source converters continuously absorb and output adjustable reactive power. The mathematical model of the three-phase voltage source converter in a direct quadrature (DQ)-frame is analyzed. A decoupling method of the DC-side voltage and reactive power is designed through the state feedback linearization controlling strategy in non-linear differential geometry theory, and the PI controller parameters are set. Finally, the control method is verified effectiveness by Electromagnetic transient simulation software PSCAD/EMTDC. Simula

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Pradhan, S. C., and A. Kumar. "Buckling Analysis of Single Layered Graphene Sheet Under Biaxial Compression Using Nonlocal Elasticity Theory and DQ Method." Journal of Computational and Theoretical Nanoscience 8, no. 7 (2011): 1325–34. http://dx.doi.org/10.1166/jctn.2011.1818.

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Hamam, D., and N. Belaloui. "Ramond and Neveu–Schwarz paraspinning strings in presence of D-branes." International Journal of Modern Physics A 33, no. 08 (2018): 1850048. http://dx.doi.org/10.1142/s0217751x18500483.

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We investigate the theory of an open parafermionic string between two parallel Dp-, Dq-branes in Ramond and Neveu–Schwarz sectors. Trilinear commutation relations between the string variables are postulated and the corresponding ones in terms of modes are derived. The analysis of the spectrum shows that one can again have a free tachyon Neveu–Schwarz model for some values of the order of the paraquantization associated to some values of p and q. The consistency of this model requires the calculation of the partition function and its confrontation with the results of the degeneracies. A perfect

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Demir, Çiğdem, Hakan Ersoy, Kadir Mercan, and Ömer Civalek. "Free vibration analysis of annular sector plates via conical shell equations." Curved and Layered Structures 4, no. 1 (2017): 146–57. http://dx.doi.org/10.1515/cls-2017-0011.

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Abstract In this paper, free vibration analysis of annular sector plates has been presented via conical shell equations. By using the first-order shear deformation theory (FSDT) equation of motion of conical shell is obtained. The method of discrete singular convolution (DSC) and method differential quadrature (DQ) are used for solution of the vibration problem of annular plates for some special value of semi-vertex angle via conical shell equation. The obtained numerical results based on the two numerical approaches for annular sector plates compare well with the results available in the lite

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Jena, Subrat Kumar, and S. Chakraverty. "Free Vibration Analysis of Single Walled Carbon Nanotube with Exponentially Varying Stiffness." Curved and Layered Structures 5, no. 1 (2018): 201–12. http://dx.doi.org/10.1515/cls-2018-0015.

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Abstract In this paper, Differential Quadrature Method (DQM) is applied to investigate free vibration of Single Walled Carbon Nanotubes (SWCNTs) with exponentially varying stiffness based on non-local Euler-Bernoulli beam theory. Application of DQ method in the governing differential equation converts the problem to a generalized eigenvalue problem and its solution gives frequency parameters. Convergence of the results show that DQM solutions converge fast. In this article, a detailed investigation has been reported and MATLAB code has been developed to analyze the numerical results for differ

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Andérez González, Jorge, and Riccardo Vescovini. "Simplified Approach to Nonlinear Vibration Analysis of Variable Stiffness Plates." Journal of Composites Science 7, no. 1 (2023): 30. http://dx.doi.org/10.3390/jcs7010030.

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A formulation for the analysis of the nonlinear vibrations of Variable Stiffness (VS) plates is presented. Third-order Shear Deformation Theory (TSDT) is employed in conjunction with a mixed variational formulation. The solution is sought via Ritz approximation for the spatial dependency, while time dependency is handled via Differential Quadrature (DQ) and Harmonic Balance (HB) methods. The main advantage of the framework is the reduced computational time, which is of particular interest to explore the large design space offered by variable stiffness configurations. The results are validated

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Abrol, Monika, Megha Pandeya, Neeraj Sharma, and Kuldeep Singh Kulhar. "Improvement of Voltage Quality in a Distribution System by a Novel Simplified Unit Vector Theory." E3S Web of Conferences 540 (2024): 09009. http://dx.doi.org/10.1051/e3sconf/202454009009.

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Nowadays, electrical engineers are increasingly concerned about power quality due to the rising load demand and the utilization of non-linear loads by end users. Power must be supplied continuously and with excellent quality. Voltage variation is a prevalent occurrence in power distribution systems due to the presence of reactance in AC systems and fluctuations in load demand. The dynamic voltage restorer is a compensation device that effectively resolves voltage problems within power distribution systems. The theory of synchronous reference frame is utilized for controlling the DVR components

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Hasan, Kamrul, Muhammad Murtadha Othman, Sheikh Tanzim Meraj, Md Siddikur Rahman, Molla Shahadat Hossain Lipu, and Panos Kotsampopoulos. "DC-AC Converter with Dynamic Voltage Restoring Ability Based on Self-Regulated Phase Estimator-DQ Algorithm: Practical Modeling and Performance Evaluation." Electronics 12, no. 3 (2023): 523. http://dx.doi.org/10.3390/electronics12030523.

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A self-regulated phase estimator (SRPE)-based DQ algorithm for a DC-AC converter with dynamic voltage restoring (DVR) ability is presented in this paper. When compared to the conventional phase-locked loop (PLL), the provided controller can significantly reduce phase distortions and low-order harmonics from the load voltage while attaining quicker dynamic response. Furthermore, the fundamental attribute of the load voltage allows the integrated DC-AC converter to operate at a consistent frequency eliminating frequency oscillations. The SRPE is utilized primarily in the DQ control theory as the

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39

Liu, C., L. L. Ke, Y. S. Wang, J. Yang, and S. Kitipornchai. "Buckling and post-buckling of size-dependent piezoelectric Timoshenko nanobeams subject to thermo-electro-mechanical loadings." International Journal of Structural Stability and Dynamics 14, no. 03 (2014): 1350067. http://dx.doi.org/10.1142/s0219455413500673.

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Buckling and post-buckling behaviors of piezoelectric nanobeams are investigated by using the nonlocal Timoshenko beam theory and von Kármán geometric nonlinearity. The piezoelectric nanobeam is subjected to an axial compression force, an applied voltage and a uniform temperature rise. After constructing the energy functionals, the nonlinear governing equations are derived by using the principle of minimum total potential energy and discretized by using the differential quadrature (DQ) method. A direct iterative method is employed to determine the buckling and post-buckling responses of piezoe

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Murthy, G. V. K., Sowjan Kumar, B. Nagaraju, R. Shankar, C. Rajalingam, and C. Rajaselvan. "Power Factor Compensation for a Single-Phase AC-DC Hybrid Micro-Grid." International Journal of Innovative Research in Engineering and Management 9, no. 5 (2022): 327–30. http://dx.doi.org/10.55524/ijirem.2022.9.5.49.

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A single-phase AC-DC Hybrid Micro-Grid (HMG) power flow control strategy is modeled and simulated in this paper. Two AC and two DC zones are separated by a bidirectional interlinking converter (BIC) in the full bridge IGBT structure, which is a typical H-Bridge inverter/rectifier, in the proposed HMG system topology. Based on the DQ transformation theory, the BIC's switching pattern comes from one voltage loop (Vdc) and two power control loops. The transfer of both active and reactive power between the HMG and the public AC Grid is controlled by this control strategy. Additionally, this can be

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41

Itoh, Makoto. "Quantitative Descriptions of Nonlinear Gravitational Galaxy Clustering." Publications of the Astronomical Society of Japan 42, no. 4 (1990): 481–503. https://doi.org/10.1093/pasj/42.4.481.

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Abstract In order to investigate nonlinear gravitational galaxy clustering, three different quantitative analyses were carried out: two-point correlation functions, ξ(r); fractal dimensions, Dq; and f(N) statistics. The relation between the exponent γ of the correlation function [ξ(r) ∝ r–γ] and the fractal dimensions, Dq, was derived with the help of the probability distribution function, f(N), for finding N galaxies within a volume V. The methods were applied to analyze the results of N-body simulations with power law initial density fluctuations (|δk|2 ∝ kn, n = 1,0,–1 and –2). These analys

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Wu, He Long, Sritawat Kitipornchai, and Jie Yang. "Thermal Buckling and Postbuckling Analysis of Functionally Graded Carbon Nanotube-Reinforced Composite Beams." Applied Mechanics and Materials 846 (July 2016): 182–87. http://dx.doi.org/10.4028/www.scientific.net/amm.846.182.

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Thermal buckling and postbuckling of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) beams are investigated in this paper based on Timoshenko beam theory within the framework of von Kármán geometric nonlinearity. The material properties of FG-CNTRCs are assumed to be temperature-dependent and vary in the beam thickness direction. The governing equations are derived by employing Hamilton’s principle then discretized by using differential quadrature (DQ) method. An iterative scheme is used to obtain the critical buckling temperature and nonlinear thermal postbuckling equili

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Roques, Clément, David E. Rupp, Jean-Raynald de Dreuzy, et al. "Recession discharge from compartmentalized bedrock hillslopes." Hydrology and Earth System Sciences 26, no. 16 (2022): 4391–405. http://dx.doi.org/10.5194/hess-26-4391-2022.

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Abstract. We used numerical modelling to explore the role of the vertical compartmentalization of hillslopes on groundwater flow and recession discharge. We found that, when hydraulic properties are vertically compartmentalized, streamflow recession behaviour may strongly deviate from what is predicted by groundwater theory that considers the drainage of shallow reservoirs with homogeneous properties. We further identified the hillslope configurations for which the homogeneous theory derived from the Boussinesq solution approximately holds and, conversely, for those for which it does not. By c

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Dey, Tanmoy, Amit Kumar Chowdhury, Sk Mehboob Alam, and Surajit Mondal. "Analysis of Six-Phase Interior Permanent Magnet Synchronous Machines for Optimal Parameter Considerations." International Journal of Applied Power Engineering (IJAPE) 7, no. 2 (2018): 139. http://dx.doi.org/10.11591/ijape.v7.i2.pp139-146.

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Understanding the merits of six-phase interior permanent magnet synchronous machines (IP-MSMs) over their three-phase counterparts, this paper analyses the six-phase machine for optimal parameter and performance considerations. Initially, a mathematical model of the six-phase IPMSM is developed employing the dq-axis theory and performance predicted by the model is verified under identical operating conditions with those using a machine designed and tested through finite element analysis (FEA). The developed and verified machine model is then employed to exclusively derive the relation between

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Khan, Mohammad Faisal, and Mohammed AbaOud. "New Applications of Fractional q-Calculus Operator for a New Subclass of q-Starlike Functions Related with the Cardioid Domain." Fractal and Fractional 8, no. 1 (2024): 71. http://dx.doi.org/10.3390/fractalfract8010071.

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Recently, a number of researchers from different fields have taken a keen interest in the domain of fractional q-calculus on the basis of fractional integrals and derivative operators. This has been used in various scientific research and technology fields, including optics, mathematical biology, plasma physics, electromagnetic theory, and many more. This article explores some mathematical applications of the fractional q-differential and integral operator in the field of geometric function theory. By using the linear multiplier fractional q-differintegral operator Dq,λmρ,σ and subordination,

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Dey, Tanmoy, Amit Chowdhury, Sk Alam, and Surajit Mondal. "Analysis of Six-Phase Interior Permanent Magnet Synchronous Machines for Optimal Parameter Considerations." International Journal of Applied Power Engineering 7, no. 2 (2018): 139–46. https://doi.org/10.11591/ijape.v7.i2.pp139-146.

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Understanding the merits of six-phase interior permanent magnet synchronous machines (IP-MSMs) over their three-phase counterparts, this paper analyses the six-phase machine for optimal parameter and performance considerations. Initially, a mathematical model of the six-phase IPMSM is developed employing the dq-axis theory and performance predicted by the model is verified under identical operating conditions with those using a machine designed and tested through finite element analysis (FEA). The developed and verified machine model is then employed to exclusively derive the relation between

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Mao, Jing Feng, Guo Qing Wu, Ai Hua Wu, Xu Dong Zhang, and Kun Yang. "Modeling and Decoupling Control of Grid-Connected Voltage Source Inverter for Wind Energy Applications." Advanced Materials Research 213 (February 2011): 369–73. http://dx.doi.org/10.4028/www.scientific.net/amr.213.369.

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This paper investigates the modeling and decoupling control of grid-connected voltage source inverter (GC-VSI) for wind energy conversion system (WECS) applications. Firstly, the typical configuration and operation principle of the direct-driven grid-connected WECS are analyzed. Then, by means of input-output modeling method and instantaneous active power theory, a time domain mathematical model of the GC-VSI is set up. Besides, in order to resolve the GC-VSI active current and reactive current cross-coupling nonlinear control problem, a vector decoupling control method for the GC-VSI firing p

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Li, H. C., L. L. Ke, J. Yang, and S. Kitipornchai. "Size-Dependent Free Vibration of Microbeams Submerged in Fluid." International Journal of Structural Stability and Dynamics 20, no. 12 (2020): 2050131. http://dx.doi.org/10.1142/s021945542050131x.

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The size-dependent free vibration of microbeams submerged in fluid is presented in this paper based on the modified couple stress theory. Two different cross-section shapes of microbeams are considered, i.e. the circular cross-section and rectangular cross-section. This nonclassical microbeam model is introduced for capturing the size effect of microstructures. In this fluid and structure coupled system, the effect of hydrodynamic loading on microbeams can be expressed by the added mass method. By using Hamilton’s principle and differential quadrature (DQ) method, we can derive governing equat

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Wu, Chih-Ping, and Jyun-Yu Liou. "RMVT-Based Nonlocal Timoshenko Beam Theory for Stability Analysis of Embedded Single-Walled Carbon Nanotube with Various Boundary Conditions." International Journal of Structural Stability and Dynamics 16, no. 10 (2016): 1550068. http://dx.doi.org/10.1142/s0219455415500686.

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On the basis of Reissner’s mixed variational theorem (RMVT), a nonlocal Timoshenko beam theory (TBT) is developed for the stability analysis of a single-walled carbon nanotube (SWCNT) embedded in an elastic medium, with various boundary conditions and under axial loads. Eringen’s nonlocal elasticity theory is used to account for the small length scale effect. The strong formulations of the RMVT-based nonlocal TBT and its associated possible boundary conditions are presented. The interaction between the SWCNT and its surrounding elastic medium is simulated using the Pasternak foundation models.

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Czaja, Maria, Radosław Lisiecki, Rafał Juroszek, and Tomasz Krzykawski. "Luminescence Properties of Tetrahedral Coordinated Mn2+; Genthelvite and Willemite Examples." Minerals 11, no. 11 (2021): 1215. http://dx.doi.org/10.3390/min11111215.

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The cause of the split of 4A4E(4G) Mn2+ excited level measured on minerals spectra is discussed. It is our view that ∆E = |4E(4G) − 4A(4G)| should be considered an important spectroscopic parameter. Among the possible reasons for the energy levels splitting taken under consideration, such as the covalent bond theory, the geometric deformation of the coordination polyhedron and the lattice site’s symmetry, the first one was found to be inappropriate. Two studied willemite samples showed that the impurities occur in one of the two available lattice sites differently in both crystals. Moreover, i

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