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Journal articles on the topic 'Transient differential characteristics'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Dong, Hua Ying, Li Ze Xu, Gui Shu Liang, Xin Liu, and Xu Cheng. "Wide-Band Modeling of Grounding Grid Based on the Fractional Order Differential Theory." Advanced Materials Research 860-863 (December 2013): 2292–95. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.2292.

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Research on the wide-band modelling method of the grounding grid and the analysis of the electromagnetic transients on the grounding grid has significant practical meaning on the engineering problems, e.g. overvoltage protection, insulation coordination and electromagnetic interference and the increasing levels of capacity in the power and communication systems. This paper presents strategies which establish the equivalent circuit for computing the transient performance of grounding grid base on fractional order differential theory, which takes into account the fractional frequency characteris

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2

Yu, Xiaodong, Jian Zhang, and Ling Zhou. "Hydraulic Transients in the Long Diversion-Type Hydropower Station with a Complex Differential Surge Tank." Scientific World Journal 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/241868.

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Based on the theory of hydraulic transients and the method of characteristics (MOC), a mathematic model of the differential surge tank with pressure-reduction orifices (PROs) and overflow weirs for transient calculation is proposed. The numerical model of hydraulic transients is established using the data of a practical hydropower station; and the probable transients are simulated. The results show that successive load rejection is critical for calculating the maximum pressure in spiral case and the maximum rotating speed of runner when the bifurcated pipe is converging under the surge tank in

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3

Tang, Jun. "Application of Wavelet Analysis in Transient Electromagnetic Sounding." Advanced Materials Research 346 (September 2011): 757–63. http://dx.doi.org/10.4028/www.scientific.net/amr.346.757.

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On the basis of explaining the basis theory on transient electromagnetic sounding, wavelet theory and imaging principle of differential conductivity for transient electromagnetic sounding data, this thesis proposes rapid imaging technology of electromagnetic sounding based on wavelet analysis, describes the characteristics of noises under wavelet decomposition, and employs wavelet packet analysis to eliminate noise of signals, at last, introduces wavelet analysis into transient electromagnetic sounding on the platform of MATLAB wavelet function toolbox and deals with differential conductivity

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4

Zhang, Xu. "Transient Flow Characteristics of a Pressure Differential Valve with Different Valve Spool Damping Orifice Structures." Strojniški vestnik - Journal of Mechanical Engineering 70, no. 3-4 (2024): 141–58. http://dx.doi.org/10.5545/sv-jme.2023.691.

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Lubrication system failure is a significant cause of in-flight shutdown incidents in aviation engines. The pressure differential valve, an essential component of a certain type of aviation engine lubrication system, is responsible for controlling the flow rate and pressure of the lubricating oil. Comprehending the transient flow characteristics of the pressure differential valve is of paramount importance for the secure operation of lubrication systems. This paper establishes a transient flow model of a pressure differential valve based on a transient computational fluid dynamics (CFD) method,

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5

Chao, Xiuli, and Yuxi Zheng. "TRANSIENT ANALYSIS OF IMMIGRATION BIRTH–DEATH PROCESSES WITH TOTAL CATASTROPHES." Probability in the Engineering and Informational Sciences 17, no. 1 (2003): 83–106. http://dx.doi.org/10.1017/s0269964803171057.

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Very few stochastic systems are known to have closed-form transient solutions. In this article we consider an immigration birth and death population process with total catastrophes and study its transient as well as equilibrium behavior. We obtain closed-form solutions for the equilibrium distribution as well as the closed-form transient probability distribution at any time t ≥ 0. Our approach involves solving ordinary and partial differential equations, and the method of characteristics is used in solving partial differential equations.

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6

Gabbasova, Elena L., Artem E. Komissarov, Olga E. Agranovich, et al. "Hereditary sensory motor polyneuropathy." Pediatric Traumatology, Orthopaedics and Reconstructive Surgery 8, no. 3 (2020): 333–42. http://dx.doi.org/10.17816/ptors21182.

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Congenital contractures are a heterogeneous group of various diseases with different etiology and pathogenesis. The article describes a family case of hereditary sensory-motor polyneuropathy caused by a mutation with 943GA (p Arg315Trp) in the TRPV4 gene (transient receptor potential vanilloid cation channel 4, NM_021625. 4). The article presents the clinical and neurological characteristics of the patient, the results of genetic and neurophysiological examination of the patient and his parents, differential diagnosis of this disease. Congenital contractures are a heterogeneous group of

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7

Wei, Wei, Li He, Wei Zhen, and Xiao Bin Liang. "Analysis on Line Differential Protection Based on Transient Saturation Characteristics of TPY-Type Current Transformer." Advanced Materials Research 1070-1072 (December 2014): 671–77. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.671.

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Transient saturation characteristics of TPY-type current transformer have great impact on the right action of line differential protection. This paper proposes an analytical method of line differential protection under current transformer saturation by utilizing current transformer model and test methods. The true current value of primary side can be obtained by our proposed method and therefore it yields correct assessment of line operating status. This method has high reliability applying to practical engineering examples of differential protection.

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8

Zhang, Xiaoqing. "An Efficient Algorithm for Transient Calculation of the Electric Networks Including Magnetizing Branches." Mathematical Problems in Engineering 2011 (2011): 1–11. http://dx.doi.org/10.1155/2011/479626.

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A simplified model of magnetic saturation characteristics is proposed in this paper for transient calculation of the electric networks including magnetizing branches. The model represents the magnetic saturation characteristics by the continuous function instead of the piecewise linear approximation. Based on the proposed model, an efficient transient algorithm is developed. The nonlinear differential equations describing the transient behavior of the magnetizing branches are solved by the semiexplicit Runge-Kutta method, in which noniterative computations are involved. The transient calculati

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9

Gao, Yang, and Guo Yan Liang. "The Analysis and Discussion of the Actual Case about the Differential Protection Malfunction Caused by the Transient Exciting Current of Large-Scale High-Voltage Main Transformer at the Time of Switching." Advanced Materials Research 694-697 (May 2013): 785–89. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.785.

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In this paper, based on the choice of voltage level 500kV for large transformer differential protection of maloperation accident actually as an example, discusses how to improve the reliability and the transformer differential protection with the relationship between pressure test. Analysis found that in order to avoid the excitation transient exciting current transformer differential protection sparked the misoperation, on-site technical personnel in the differential protection setting calculation process, make use of data in conformity with the relevant parameters, rules and standards, famil

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10

Deng, Xiaopin, Hua Huang, Yong Liu, Xiaozhou Wang, and Bin Liu. "Research on Consistency of Transient Response Characteristics of Current Transformers for DC application in DC Engineering." Journal of Physics: Conference Series 2087, no. 1 (2021): 012024. http://dx.doi.org/10.1088/1742-6596/2087/1/012024.

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Abstract In ultra high voltage(UHV) DC system, the transient characteristics for fault current monitoring of current transformers for DC application (DCCTs) and the consistency of response characteristics when different types of DCCTs are used for differential protection have become important factors affecting the safe and stable operation of DC system. In this paper, transient characteristics of all-fiber DCCTs and shunt DCCTs mainly used in DC system were studied, the main parameters of the transient characteristics including delay time and maximum peak instantaneous error were tested, and t

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11

Liu, Yan Cheng, and Chuan Wang. "Modeling and Simulation on Ship Power Station under Large Disturbance." Advanced Materials Research 121-122 (June 2010): 74–79. http://dx.doi.org/10.4028/www.scientific.net/amr.121-122.74.

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This paper presents a non-linear math model on ship power station and numerical simulation, aiming at describing dynamic characteristic of electric propulsion ship shipboard power system precisely. Non-linear differential algebraic equations are given by differential equation modeling theory, concerning with diesel engine speed characteristics, electromagnetic and electrical transient characteristics (Φd, Φq, Ed", Eq", E'q, ω, δ as status variables) of synchronous generator and voltage characteristics of excitation system. Then the non-linear equations are solved by implicit trapezoidal integr

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12

Kropachek, Olha, Ruslan Mygushchenko, Grygoriy Suchkov, Kateryna Mygushchenko, Oleksii Finohenov, and Kyrylo Kotskalo. "STUDYING TRANSIENT CHARACTERISTICS OF ELECTRICAL CIRCUITS IN ROBOT DRIVES." Bulletin of the National Technical University "KhPI". Series: Hydraulic machines and hydraulic units, no. 2 (March 6, 2025): 4–11. https://doi.org/10.20998/2411-3441.2024.2.01.

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The article deals with the issues of mathematical analysis, mathematical modeling, creating an analytical foundation for constructing hardware and algorithmic support for the drive device for launching aircraft by robots in order to determine the optimal choice of structure and parameters of the control loop. The article examines equivalent circuits for control loops in the form of RL circuits and RLC circuits. Mathematical modeling for the drive functioning is carried out by considering first- and second-order differential equations. The article determines the transient characteristics of con

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13

Gao, Jin, and Xiaoping Qi. "Analysis and optimization of vehicle transient characteristics under sine-swept steering input with considering steering system stiffness and damping." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 236, no. 1 (2022): 51–67. http://dx.doi.org/10.1177/14644193211072612.

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This study focuses on the influence of steering system stiffness and damping on the vehicle transient characteristics at two different types of handling frequencies, and optimizes the vehicle transient characteristics with steering system stiffness and damping as optimization variables at both handling frequencies. The kinematic relationship between wheel angle and steering wheel angle is derived as well as a detailed analysis of the forces on the steering linkage. The differential equations of vehicle dynamics are developed to explain the influence of steering system stiffness and damping on

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14

Markov, V. A., E. F. Pozdnyakov, V. V. Furman, and S. V. Plakhov. "Simulation of the Diesel Engine Rotational Speed Automatic Control System." Proceedings of Higher Educational Institutions. Маchine Building, no. 7 (712) (July 2019): 35–46. http://dx.doi.org/10.18698/0536-1044-2019-7-35-46.

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In this work, the problem of improving the quality of controlling the diesel engine crankshaft speed is considered. The principles that govern the control of this parameter in internal combustion engines are described. The advantages of the proportional-integral-differential (PID) control principle are shown. Calculations of the influence of the PID controller structure on the dynamic characteristics of the diesel engine rotational speed automatic control system are performed. The transient processes of acceleration–inhibition and load-dropping are investigated using a KamAZ-740 engine of a 10

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15

Жакенова, Г. Ж., Р. Б. Нуржанова, К. Б. Сраилова, Ж. С. Шерияздан, А. Б. Ташманова, and Б. Н. Раимкулов. "TRANSIENT ISCHEMIC ATTACKS: ETIOPATHOGENESIS, CLINIC. (Literature review)." Vestnik, no. 3 (December 15, 2021): 91–96. http://dx.doi.org/10.53065/kaznmu.2021.32.28.017.

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В данной статье представлен обзор литературы по транзиторным ишемическим атакам: эпидемиология, этиология, патогенез, классификация, основные характеристики с учетом факторов риска, визуализационных признаков МРТ и КТ, клинических проявлений и дифференциальной диагностики данного заболевания на основе современных исследований. This article presents a review of the literature on transient ischemic attacks: epidemiology, etiology, pathogenesis, classification, main characteristics taking into account risk factors, imaging signs of MRI and CT, clinical manifestations and differential diagnosis of

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16

Dózsa, L., F. Riesz, J. Karányi, Vo Van Tuyen, B. Szentpáli, and A. Muller. "A Transient Method for Measuring Current–Voltage Characteristics with Negative Differential Resistance Regions." physica status solidi (a) 163, no. 1 (1997): R1—R2. http://dx.doi.org/10.1002/1521-396x(199709)163:13.0.co;2-g.

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17

Slaughter, M. M., and S. H. Bai. "Differential effects of baclofen on sustained and transient cells in the mudpuppy retina." Journal of Neurophysiology 61, no. 2 (1989): 374–81. http://dx.doi.org/10.1152/jn.1989.61.2.374.

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1. Baclofen, a gamma-aminobutyric acid (GABA)/B receptor agonist, was bath applied while recording the responses of second- and third-order neurons in the mudpuppy retina. Baclofen receptors were largely restricted to amacrine and ganglion cells. 2. Baclofen hyperpolarized the membrane potential of many, but not all, third-order neurons. This involved an increase in input conductance, probably associated with an opening of potassium channels. 3. The maximal increase in input conductance associated with the activation of GABA/B receptors was approximately one-third of that produced by activatio

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18

Kafle, Jeevan, Bhogendra Kumar Thakur, and Indra Bahadur Bhandari. "Visualization, formulation and intuitive explanation of iterative methods for transient analysis of series RLC circuit." BIBECHANA 18, no. 2 (2021): 9–17. http://dx.doi.org/10.3126/bibechana.v18i2.31208.

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The time varying currents and voltages resulting from the sudden application of sources usually due to switching are transients. An RLC circuit is an electrical circuit consisting of a resistor, an inductor, and a capacitor, connected in series or in parallel. The transient response is dependent on the value of the different characteristics of damping factor (i.e., over damped, critically damped and under damped). We have computed the numerical solutions of second order differential equation with initial value problem (IVP) by using Explicit (Forward) Euler method, Third order Runge-Kutta (RK3

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19

Bert, C. W., and M. Malik. "Transient Analysis of Gas-Lubricated Journal Bearing Systems by Differential Quadrature." Journal of Tribology 119, no. 1 (1997): 91–99. http://dx.doi.org/10.1115/1.2832489.

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This paper is an extension of an earlier work in which the present authors demonstrated the application of the differential quadrature method (DQM) to the steady-state analysis of incompressible and compressible lubrication problems. In the present work, the DQM is applied to the transient-state analysis of compressible lubrication problems. For this purpose, the analysis of gas-lubricated plain journal bearings under the conditions of nonuniform journal rotation is considered. The computed results from the solutions of the reference problem included in the paper provide a comparison of the co

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20

Achak, N., B. Bahrar, and K. Gueraoui. "Numerical modeling transient flow in plastic pipes." MATEC Web of Conferences 286 (2019): 07001. http://dx.doi.org/10.1051/matecconf/201928607001.

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We present a numerical code for calculating transient flow in plastic pipes, especially in the polyethylene pipe, to analysis effect of material viscoelasticity on water hammer phenomena. The set partial differential equations to be solved is obtained using conservation laws and behavior for the fluid and the pipe wall, associated with constitutive equations of the two media, and relationships compatibility of interfaces on velocities and stresses. A global digital processing is achieved using the method of characteristics. The results obtained are in good agreement with those found in the lit

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21

Lahcen Abouerraja, Hassan Samri, and Bennasser Bahrar. "Numerical Analysis of Transient Flow in Polyethylene Pipe." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 99, no. 2 (2022): 87–93. http://dx.doi.org/10.37934/arfmts.99.2.8793.

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We present a numerical code for calculating transient flow in plastic pipes, especially in the polyethylene pipe, to analysis transient flow in a viscoelastic pipe such as polyethylene. The set partial differential equations to be solved is obtained using conservation laws and behavior for the fluid and the pipe wall, associated with constitutive equations of the two media. A global digital processing is achieved using the method of characteristics. The results obtained are in good agreement with those found in the literature.

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22

Kudryavceva, N., A. Tokarev, E. Zharkova, V. Zykova, and O. Savinyh. ") TRANSITIONAL MYOCARDIAL HYPERTROPHY IN NEWBORNS (cases from practice)." Clinical Medicine and Pharmacology 7, no. 1 (2021): 6–8. http://dx.doi.org/10.12737/2409-3750-2021-7-1-6-8.

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The introduction gives the morphological characteristics of myocardial hypertrophy, hy-pertrophic cardiomyopathy, as a subject of differential diagnosis. In the description of clinical cases of diagnostics of transient myocardial hypertrophy by echocardiographic method, the aim was to show the possibilities of such diagnostics in newborns

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23

Lee, Soo Hyung, Hong In Park, Michael Sung Choe, et al. "General Characteristics for Poisoning-Induced Transient or Sustained Hyperammonemia." Journal of The Korean Society of Clinical Toxicology 14, no. 2 (2016): 136–43. http://dx.doi.org/10.22537/jksct.14.2.136.

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Purpose: In patients with altered mentality caused by drugs or unknown causes, ammonia is checked to facilitate differential diagnosis or diagnose hepatic coma. This helps early prevention and treatment of brain damage due to hyperammonemia. This study was conducted to evaluate clinical characteristics of intoxicated adult patients with hyperammonemia. Methods: We evaluated 95 patients with hyperammonemia among intoxicated patients above the age of 15 who visited our ED from January 2013 to December 2015. We analyzed the demographic characteristics and type of poisoning substance, reason for i

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24

Reznichenko, Igor, Primož Podržaj, and Aljoša Peperko. "Variable Time Step Algorithm for Transient Response Analysis for Control and Optimization." Fractal and Fractional 8, no. 12 (2024): 710. http://dx.doi.org/10.3390/fractalfract8120710.

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This work considers an optimization problem based on step response characteristics. We lay a foundation for it by designing a rapid transient response analysis algorithm with variable time steps. This method applies to linear ordinary differential equations with real order. Numerical tests of the algorithm in the integer case show significant improvement even for higher order systems. This suggests a new method for acquiring step response characteristics for the fractional order case for which we have constructed an explicit expression of the inverse Laplace transform.

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25

Chen, Yu Mei, Fei Tan, and Tao Fan. "Design of Multi-Mode PID Controller and Application in Time-Delay Process." Applied Mechanics and Materials 511-512 (February 2014): 637–42. http://dx.doi.org/10.4028/www.scientific.net/amm.511-512.637.

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Through brief analysis of characteristics of conventional control, a new type of multi-mode intelligent control algorithm based on error information is put forward. The algorithm consists of proportional acceleration control for rapidity of transient response, differential deceleration control for stationarity of transient response and steady state excitation control for accuracy of steady response. The control algorithm is applied to time-delay process, compared with other algorithms. Simulation results show its good performance with MATLAB language. The algorithm has simple structure, good g

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26

Pozos-Estrada, Oscar. "Investigation of the combined effect of air pockets and air bubbles on fluid transients." Journal of Hydroinformatics 20, no. 2 (2017): 376–92. http://dx.doi.org/10.2166/hydro.2017.018.

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Abstract This paper presents numerical and experimental investigations of the combined effect on pressure transients of air pockets and homogenous water–air bubble mixtures. An air pocket can accumulate at a high point of a pipeline along the control section located at the transition between pipes with sub- and supercritical slope, forcing open channel flow conditions underneath the pocket that ends in a hydraulic jump at the downward sloping pipe. The turbulence action at the jump generates small air bubbles that are entrained and transported along the pipe producing a two-component bubbly fl

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27

Lu, Kailiang, Xiu Li, Jianhua Yue, Ya’nan Fan, Qinrun Yang, and Xiaozhen Teng. "The Multi-Resolution Migration Imaging Method for Grounded Electrical Source Transient Electromagnetic Virtual Wavefield." Applied Sciences 15, no. 3 (2025): 1107. https://doi.org/10.3390/app15031107.

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The traditional source uses a square wave with a fixed fundamental frequency to excite transient electromagnetic (TEM) fields, with harmonic energy primarily concentrated in the low-frequency range, limiting the detection resolution of the TEM. The differential pulse, composed of two square waves with identical pulse widths but opposite polarities, concentrates harmonic energy more effectively. By adjusting the pulse width of the differential pulse, the concentration frequency band of harmonic energy can be changed, enabling multi-resolution detection of geological structures at different dept

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28

Kandasamy, Selvakumar, and Anand V. Singh. "Transient Vibration Analysis of Open Circular Cylindrical Shells." Journal of Vibration and Acoustics 128, no. 3 (2005): 366–74. http://dx.doi.org/10.1115/1.2172264.

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A numerical method based on the Rayleigh-Ritz method has been presented for the forced vibration of open cylindrical shells. The equations are derived from the three-dimensional strain-displacement relations in the cylindrical coordinate system. The middle surface of the shell represents the geometry, which is defined by an angle that subtends the curved edges, the length, and the thickness. The displacement fields are generated with a predefined set of grid points on the middle surface using considerably high-order polynomials. Each grid point has five degrees of freedom, viz., three translat

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29

Barone, M. R., and D. A. Caulk. "A New Method for Thermal Analysis of Die Casting." Journal of Heat Transfer 115, no. 2 (1993): 284–93. http://dx.doi.org/10.1115/1.2910678.

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A new approach is developed for solving the initial value, steady periodic heat conduction problem in steady-state die casting. Three characteristics found in nearly all die casting processes are exploited directly: The casting is thin compared with its overall size, its thermal conductivity is high compared with that of the mold, and the cycle time is short compared with the start-up transient of the process. Under these conditions, it is reasonable to neglect the transverse temperature gradients in the casting and assume that all die temperatures below a certain depth from the cavity surface

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30

Манойло В. М. "МАТМОДЕЛЬ ГАЗОВОГО ДВИГАТЕЛЯ, ИСПОЛЬЗУЕМОГО В КАЧЕСТВЕ ПРИВОДА МОБИЛЬНОГО ТРАНСПОРТНОГО СРЕДСТВА". World Science, № 9(37) (30 вересня 2018): 16–26. http://dx.doi.org/10.31435/rsglobal_ws/30092018/6130.

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   The linear differential equation of the internal combustion engine (ICE) itself, by means of which it is possible to investigate the dynamic characteristics (transients) and throttle response of the new generation of gas engines, used as a drive for mobile vehicles, is given. At present, the need has arisen to create a new generation of ICS control systems that would combine the principles of robust and adaptive management and provide a specified quality of management in the conditions of structural or parametric uncertainty of the control facility itself, uncertainty of e

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Ginsberg, J. H. "Comparison of the Effects of Density and Sound Speed Variation in the Propagation of Planar Transient Waves." Journal of Vibration and Acoustics 114, no. 3 (1992): 409–14. http://dx.doi.org/10.1115/1.2930277.

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When expressed in the form of characteristic differential equations, the laws governing propagation of linear one-dimensional waves through heterogeneous media show that the only properties of significance are the sound speed c and the acoustic impedance ρc, either of which may vary spatially. The former occurs in the differential equations governing the (curved) characteristics, while the latter appears in the differential equations governing the evolution of particle velocity and stress along the characteristics. The present study employs an inherently stable finite difference representation

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Martins, António, Paulo Laranjeira, Madalena Dias, and José Lopes. "Mass Transport Modelling in Porous Media Using Delay Differential Equations." Defect and Diffusion Forum 258-260 (October 2006): 586–91. http://dx.doi.org/10.4028/www.scientific.net/ddf.258-260.586.

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In this work the application of delay differential equations to the modelling of mass transport in porous media, where the convective transport of mass, is presented and discussed. The differences and advantages when compared with the Dispersion Model are highlighted. Using simplified models of the local structure of a porous media, in particular a network model made up by combining two different types of network elements, channels and chambers, the mass transport under transient conditions is described and related to the local geometrical characteristics. The delay differential equations syst

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Stutzin, A., S. S. Stojilkovic, K. J. Catt, and E. Rojas. "Characteristics of two types of calcium channels in rat pituitary gonadotrophs." American Journal of Physiology-Cell Physiology 257, no. 5 (1989): C865—C874. http://dx.doi.org/10.1152/ajpcell.1989.257.5.c865.

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The properties of Ca2+ channels in cultured rat pituitary gonadotrophs were analyzed by the patch-clamp technique. The inward Ca2+ currents, recorded in the presence of 5.2 mM Ca2+ or Ba2+, included a fast, transient component with activation-inactivation kinetics and a delayed component with slower activation. The midpoint of the activation curve lay at -30 mV for the transient component and at -12 mV for the delayed component. At the midpoint, changes in potential of 9.5 and 13 mV induced an e-fold change in the activation of the transient and delayed components, respectively. The rate of in

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Shiau, T. N., and A. N. Jean. "Nonlinear Transient Analysis of Large Rotordynamic Systems." Journal of Applied Mechanics 58, no. 2 (1991): 596–98. http://dx.doi.org/10.1115/1.2897233.

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A solution technique based on implicit numerical integration combined with a condensation technique is presented to predict the transient response of large flexible rotor systems with nonlinear characteristics. The analysis directly tackles the nonlinear second-order differential equations which describe the system motion. The condensation technique can lead to a reduced model in which only the coordinates associated with nonlinear components of the system are considered. Thus, a substantial reduction of computation can be expected if the nonlinear components of system are sparse. A flexible r

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35

Kim, Hyun-Sil, and Jerry H. Ginsberg. "Transient Wave Propagation in a Harmonically Heterogeneous Elastic Solid." Journal of Applied Mechanics 59, no. 2S (1992): S145—S151. http://dx.doi.org/10.1115/1.2899479.

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Transient propagation of a one-dimensional dilatational wave in a harmonically heterogeneous elastic solid is studied by several techniques. A regular perturbation analysis in terms of the characteristics of the differential equation shows that initiation of a temporally harmonic excitation that generates a signal whose wavelength is twice the periodicity of the heterogeneity leads to secularity in the first approximation. The frequency at which this situation occurs matches the frequency at which Floquet theory predicts that steady-state waves may be unstable. A finite difference algorithm ba

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Fatunmbi, E. O., and O. O. Akanbi. "Thermal Propagation Effects of Hydromagnetic Micropolar Nanofluid Flow over an Expanding Stagnation-point Surface." Physical Science International Journal 29, no. 4 (2025): 1–17. https://doi.org/10.9734/psij/2025/v29i4885.

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The current study investigates the transient stagnation-point flow and heat transfer characteristics of a magneto-micropolar nanofluid over an expanding surface under the influence of thermal radiation and boundary slip. The developed model incorporates the effects of micropolarity with weak concentration, external magnetic fields, and microscopic nanoparticles for enhanced thermal conductivity. The governing partial differential equations are formulated using boundary layer assumptions and transformed into a system of nonlinear ordinary differential equations through appropriate similarity tr

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37

Vanden Berghe, Pieter, Sander Molhoek, Ludwig Missiaen, Jan Tack, and Jozef Janssens. "Differential Ca2+ signaling characteristics of inhibitory and excitatory myenteric motor neurons in culture." American Journal of Physiology-Gastrointestinal and Liver Physiology 279, no. 5 (2000): G1121—G1127. http://dx.doi.org/10.1152/ajpgi.2000.279.5.g1121.

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Physiological studies on functionally identified myenteric neurons are scarce because of technical limitations. We combined retrograde labeling, cell culturing, and fluorescent intracellular Ca2+ concentration ([Ca2+]i) signaling to study excitatory neurotransmitter responsiveness of myenteric motor neurons. 1,1-Didodecyl-3,3,3′,3′-tetramethyl indocarbocyanine (DiI) was used to label circular muscle motor neurons of the guinea pig ileum. DiI-labeled neurons were easily detectable in cultures prepared from these segments. The excitatory neurotransmitters (10−5 M) acetylcholine, substance P, and

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Zhao, Pengcheng, Jingang Wang, Qian Wang, et al. "Simulation, Design, and Test of a Dual-Differential D-Dot Overvoltage Sensor Based on the Field-Circuit Coupling Method." Sensors 19, no. 15 (2019): 3413. http://dx.doi.org/10.3390/s19153413.

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Accurate measurement of overvoltage in power grids is of great significance to study the characteristics of overvoltage and design of insulation coordination. Based on the research of D-dot voltage sensor, we designed a Dual-Differential D-dot overvoltage sensor. In order to quantify the structural parameters of the sensor, improve the performance and measurement accuracy of the sensor. The Field-Circuit Coupling method was proposed to be used in the parameter design of D-dot overvoltage sensor. The joint simulation of space electromagnetic field model and equivalent circuit model of the Dual-

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Xue, Yi Guo, Shu Cai Li, Mao Xin Su, Hai Yan Li, and Hao Tian. "Response and Test of Whole Space Transient Electromagnetic Field in Mine Goaf Water." Applied Mechanics and Materials 353-356 (August 2013): 1136–39. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.1136.

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The transient electromagnetic method (TEM) has sensitive characteristics of low resistivity of water containing. The equivalent plane method based on whole space theory is used in coal mine goaf water TEM detecting. The mine goaf water was forward simulation. The geoelectric model of mine goaf water was equivalented to low resistivity layer thickness. The geoelectric model was forward calculated, and it was differential imaged. Then it found the apparent longitudinal conductance differential imaging reflect the most sensitive. The field experiment was conducted in two mine goaf water in Xiezhu

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Qi, Da, Changchun Wu, Zhe Liu, and Lili Zuo. "Gas Composition Tracking in a Transient Pipeline Using the Method of Characteristics." American Journal of Energy Engineering 12, no. 2 (2024): 32–42. http://dx.doi.org/10.11648/j.ajee.20241202.12.

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For a gas pipeline with multiple gas sources, the significance of tracking the composition of natural gas is increasing with the implementation of X+1+X system for the natural gas industry in China. Mathematically, the tracking problem is usually described by a system of partial differential equations (PDEs). The continuity equation on gas composition has been developed to track natural gas composition according to the law of mass conservation. The algorithm resulting from the method of characteristics (MOC) is proposed to solve the system of PDEs. Compared to the original MOC, numerical solut

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Abduraimov, Erkin, and Baxtiyor Nurmatov. "Application of numerical and graphical methods of analysis in nonlinear resistive circuits of electronic devices." E3S Web of Conferences 384 (2023): 01052. http://dx.doi.org/10.1051/e3sconf/202338401052.

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The article discusses the research issues and methods of analysis of semiconductor circuits used in electronic circuits of contactless switching devices, provides analytical, graphic and numerical methods for the analysis of nonlinear semiconductor resistive circuits. The approximations of the Volt-Ampere characteristics (VACh) of semiconductor elements and the solution of the differential equations of state of electrical circuits by a numerical method using a computer are given. Diode, thyristor semiconductor nonlinear resistive circuits with active and inductive loads are considered. In the

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Wang, Gang, Min Huang, Hao Bai, et al. "A Current Differential Protection Scheme for Distribution Networks with Inverter-Interfaced Distributed Generators Considering Delay Behaviors of Sequence Component Extractors." Electronics 12, no. 23 (2023): 4727. http://dx.doi.org/10.3390/electronics12234727.

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The high-level proliferation of inverter-interfaced distributed generators (IIDGs) in modern distribution networks (DNs) has changed system topologies and fault current signatures, which compromises the protective relays in DNs. Investigating IIDG fault behaviors-based protection scheme will benefit the grid’s safety and stability. This paper proposes a novel current differential protection (CDP) scheme that considers the delay behaviors of positive- and negative-sequence component extractors for IIDGs in DNs. A frequency-domain analytical model of the fault current for a grid-connected IIDG w

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Luo, Hong E., Jin Liang Gu, Ping Chen, and Yan Xia. "The Deformation Measurement Technology Based on Differential Fiber Interferometer with PCI Data Acquisition System." Advanced Materials Research 571 (September 2012): 320–23. http://dx.doi.org/10.4028/www.scientific.net/amr.571.320.

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A deformation measurement technology for barrel in the launch based on differential fiber interferometer was supposed. The PCI data acquisition system and phase demodulation algorithm was used to replace the traditional hardware phase demodulation circuit which simplifying the structure and avoid the edge distortion of phase demodulation device. Experiments were done to measure the deformation of the barrel in the launch by this system. The results show that it had good response characteristics and is suitable for the transient deformation measurement of the barrel in the launch.

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Zhou, Rui, Luyao Wang, Hongmei Tian, et al. "Full-Length Transcriptome of Camellia japonica (Naidong) Reveals Molecular Characteristics in Drought Stress." Horticulturae 10, no. 2 (2024): 114. http://dx.doi.org/10.3390/horticulturae10020114.

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Camellia japonica (Naidong), a rare temperate arbor in the genus Camellia, is an ornamental plant with high economic value. To understand transcriptional changes of the drought response in C. japonica, a comparative transcriptome analysis of C. japonica (Naidong) was conducted at two drought stages (0 and 20 DAF) based on the PacBio platform. The results showed significant differences in 265 genes and 3383 lncRNAs. Of these, 150 were upregulated and 115 were downregulated. Functional analysis revealed the involvement of distinct genes in 43 pathways. The biosynthesis of amino acids and the cir

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Aleksandrova, Iliyana, Daniela Deneva, and Veneta Bojinova. "EEG finding in a patient with vasovagal syncope." Bulgarian Neurology 25, no. 2 (2024): 64–66. https://doi.org/10.5281/zenodo.15360260.

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Syncope is characterized by a transient loss of consciousness due to cerebral hypoperfusion. The main differential diagnosis is made with epileptic seizures.The paper presents the case of a boy with three episodes of loss of consciousness, after an abrupt standing with complaints of lightheadedness, followed by falling, with short duration and with subsequent complaints of headache. During the EEG an episode of loss of consciousness was recorded, in sitting position, in which the boy reported lightheadedness, followed by tonic stretching, tightening of the arms, with single clonic contractions

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Raskovic, Sanvila, Jasna Bolpacic, Aleksandra Peric-Popadic, Zikica Jovicic, Rada Miskovic, and Mirjana Bogic. "Clinical characteristics and treatment of Melkersson-Rosenthal syndrome - overview of six patients." Medical review 68, no. 11-12 (2015): 401–4. http://dx.doi.org/10.2298/mpns1512401r.

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Introduction. Melkersson-Rosenthal syndrome is a rare disease of unknown etiology. Histopathologically, it presents as granulomatous cheilitis. From laboratory aspect, it is a nonspecific, differential diagnostically and therapeutically complex condition. Case Report. This is a report of six cases treated at the Department of Allergology and Immunology of the Clinical Center of Serbia, who had presented with the referral diagnosis of recurring or persistent lip edema, and who were diagnosed with Melkersson-Rosenthal syndrome upon detailed evaluation. Three patients had complete triad of sympto

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Fu, Shiyang, Yan Tian, Jian Fang, et al. "Grid-connected virtual synchronous generator transient suppression based on proportional differential control and frequency low-pass filtering." Journal of Physics: Conference Series 2846, no. 1 (2024): 012001. http://dx.doi.org/10.1088/1742-6596/2846/1/012001.

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Abstract The virtual synchronous generator (VSG) technology has a wide range of applications in various distributed generation units. However, sudden changes in power command at grid connection can lead to severe oscillations in the output power and frequency of virtual synchronous generators. In addition, existing oscillation suppression methods are either based on complex parameter designs or change the original inertial support characteristics and power frequency drop characteristics. In this paper, a new transient suppression method is proposed, i.e., a proportional differential controller

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Grolman, Eric, and Jan M. H. Fortuin. "Transient Gas-Liquid Flow in Upward Sloping Pipes, Approaching the Wavy-to-Slug Flow Transition." Journal of Fluids Engineering 118, no. 4 (1996): 729–35. http://dx.doi.org/10.1115/1.2835502.

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A model is presented for transient, cocurrent gas-liquid pipe flow in the stratified-smooth and stratified-wavy flow regimes. It is based on the equations of continuity and motion in the direction of flow and results in two hyperbolic partial differential equations, which are solved numerically using the combined methods of lines (Schiesser, 1991) and characteristics (Stoker, 1957). In wavy gas-liquid pipe flow, three different interfacial areas and corresponding shear stresses are identified. Three friction-factor correlations were derived on the basis of an extensive set of 2500 steady-state

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Jensen, Rune, Jesper Larsen, Kasper Lassen, Matthias Mandø, and Anders Andreasen. "Implementation and Validation of a Free Open Source 1D Water Hammer Code." Fluids 3, no. 3 (2018): 64. http://dx.doi.org/10.3390/fluids3030064.

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This paper presents a free code for calculating 1D hydraulic transients in liquid-filled piping. The transient of focus is the Water Hammer phenomenon which may arise due to e.g., sudden valve closure, pump start/stop etc. The method of solution of the system of partial differential equations given by the continuity and momentum balance is the Method of Characteristics (MOC). Various friction models ranging from steady-state and quasi steady-state to unsteady friction models including Convolution Based models (CB) as well as an Instantaneous Acceleration Based (IAB) model are implemented. Furt

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Sheng, Xiaofei, Jianguo Shen, Yongjin Shen, Liufang Zhu, and Defu Zang. "Measurement of formation conductivity through-casing using a TEM method." Journal of Geophysics and Engineering 16, no. 2 (2019): 439–50. http://dx.doi.org/10.1093/jge/gxz022.

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Abstract Due to the existence of the metal casing in production wells, it is difficult for a conventional well-logging method to achieve satisfactory results. To study the possibility of measuring the formation conductivity through casing by using a transient electromagnetic (TEM) method, characteristics of the response signals received at different source-receiver spacing are investigated. Based on the advantages of the response signals at long spacing in the separation of the direct and indirect coupled signals, the corresponding differential response signals calculated with different format

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