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Journal articles on the topic 'Transfer integral'

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Published: 4 June 2025
Last updated: 23 June 2025

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1

TONG GUO-PING. "TRANSFER-INTEGRAL CALCULATION FOR CONDUCTING POLYMERS." Acta Physica Sinica 43, no. 8 (1994): 1326. http://dx.doi.org/10.7498/aps.43.1326.

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2

RAKOWSKI, M., and F. SAVATIER. "EXTRACTION OF INFRARED DIVERGENCES IN THE DIMENSIONAL REGULARIZED TWO-LOOP LADDER GRAPH." International Journal of Modern Physics A 09, no. 20 (1994): 3535–53. http://dx.doi.org/10.1142/s0217751x94001412.

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We consider the evaluation of the fundamental scalar integral in the on-shell two-loop ladder graph with different external masses and arbitrary transfer momentum. A method for cleanly extracting the infrared divergences in the Feynman parameter integrals using dimensional regularization is presented, and we analyze one of the finite part contributions to this integral.
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3

Badulescu, Alexandru Ioan. "SLn, Orthogonality Relations and Transfer." Canadian Journal of Mathematics 59, no. 3 (2007): 449–64. http://dx.doi.org/10.4153/cjm-2007-019-8.

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AbstractLet π be a square integrable representation of G′ = SLn(D), with D a central division algebra of finite dimension over a local field F of non-zero characteristic. We prove that, on the elliptic set, the character of π equals the complex conjugate of the orbital integral of one of the pseudocoefficients of π. We prove also the orthogonality relations for characters of square integrable representations of G′. We prove the stable transfer of orbital integrals between SLn(F) and its inner forms.
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4

NAGAR, HARISH, and SONIA SHARMA. "APPLICATIONS OF COMPLEX SEE INTEGRAL TRANSFORM." Journal of Science and Arts 24, no. 1 (2024): 163–72. http://dx.doi.org/10.46939/j.sci.arts-24.1-a15.

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This paper refers to the study of applications of complex SEE (Sadaq-Emad-Emann) integral transform on various functions. In this paper, we have applied complex SEE transform on some special functions including the Mittag-Leffler function, Generalized function, piecewise continuous function, and integrals. Additionally, we apply the complex SEE integral transform to determine the transfer function of mechanical systems and control engineering. As well as, present and discuss the Beam problem by utilizing complex SEE transform.
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5

Alimov, Shavkat, and Gafurjan Ibragimov. "TIME OPTIMAL CONTROL PROBLEM WITH INTEGRAL CONSTRAINT FOR THE HEAT TRANSFER PROCESS." Eurasian Mathematical Journal 15, no. 1 (2024): 08–22. http://dx.doi.org/10.32523/2077-9879-2024-15-1-08-22.

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6

Sharaf, Mohamed Adel, Zainab Khan, and Faizah Al-Bassam. "General integral operator for radiative transfer problems." Astrophysics and Space Science 129, no. 2 (1987): 303–19. http://dx.doi.org/10.1007/bf00642648.

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7

Tan, Z. M., and P. F. Hsu. "An Integral Formulation of Transient Radiative Transfer." Journal of Heat Transfer 123, no. 3 (2000): 466–75. http://dx.doi.org/10.1115/1.1371230.

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A time-dependent integral formulation is developed for modeling transient radiative transfer. The development is based on a rigorous analysis of the wave propagation process inside the participating media. The physical significance of the present integral formulation is the consideration of the time-dependent domain of computation, which is different from the domain disturbed by radiation (i.e., the wave front envelope). Numerical computations are performed for the medium that is an absorbing and isotropically scattering one-dimensional plane slab geometry. The spatial and temporal incident radiation and radiative flux distributions are presented for different boundary conditions and for uniform and nonuniform property distribution. The transient results at large time step are compared with steady-state solutions by the finite volume and quadrature methods and show excellent agreement. The solutions of reflecting boundary condition exhibit distinctive behavior from that of the non-reflecting boundary.
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8

Feskov, S. V., A. I. Ivanov, and A. I. Burshtein. "Integral encounter theory of strong electron transfer." Journal of Chemical Physics 122, no. 12 (2005): 124509. http://dx.doi.org/10.1063/1.1871935.

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9

Bašić, Milan, Marko D. Petković, and Dragan Stevanović. "Perfect state transfer in integral circulant graphs." Applied Mathematics Letters 22, no. 7 (2009): 1117–21. http://dx.doi.org/10.1016/j.aml.2008.11.005.

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10

Song, Xingkun, and Huiqiu Lin. "State transfer on integral mixed circulant graphs." Discrete Mathematics 347, no. 1 (2024): 113727. http://dx.doi.org/10.1016/j.disc.2023.113727.

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11

Wu, Zhong-Hua, Amar Debbouche, Juan Guirao, and Xiao-Jun Yang. "On local fractional Volterra integral equations in fractal heat transfer." Thermal Science 20, suppl. 3 (2016): 795–800. http://dx.doi.org/10.2298/tsci151217202w.

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In the article, the fractal heat-transfer models are described by the local fractional integral equations. The local fractional linear and nonlinear Volterra integral equations are employed to present the heat transfer problems in fractal media. The local fractional integral equations are derived from the Fourier law in fractal media.
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12

Çiftçi, Kübra, Muhammed Arif Şen, and Hasan Huseyin Bilgic. "VPSA-Based Transfer Function Identification of Single DoF Copter System." Volume 04 Issue 02 vm04, is02 (2023): 87–97. http://dx.doi.org/10.23890/ijast.vm04is02.0204.

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In this study, an experimental set of a Single-DoF Copter system is created and transfer functions that could model the dynamics of the physical system with high accuracy were investigated. In order to model the dynamics of the physical system with the highest accuracy, the five different transfer functions have been proposed, in which the zero and pole values are determined by optimizing with the Vibrating Particle System Algorithm. Integral Square Error (ISE), Integral Time Square Error (ITSE), Integral Absolute Error (IAE), Integral Time Absolute Error (ITAE) functions, which are widely used in the literature in determining transfer functions, are determined as fitness functions. In order to verify the transfer functions, the responses of the transfer functions and the experimental system response are presented comparatively, and their suitability was evaluated. It has been observed that the proposed method is successful in defining the transfer function of the experimental system, and the compatibility of the obtained transfer functions with the system response is between 75.407% and 98.612% accuracy.
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13

Altac¸, Z. "Integrals Involving Bickley and Bessel Functions in Radiative Transfer, and Generalized Exponential Integral Functions." Journal of Heat Transfer 118, no. 3 (1996): 789–92. http://dx.doi.org/10.1115/1.2822701.

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14

Sudhanshu, Aggarwal*1 &. Swarg Deep Sharma2. "SADIK TRANSFORM OF ERROR FUNCTION (PROBABILITY INTEGRAL)." GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES 6, no. 6 (2019): 125–35. https://doi.org/10.5281/zenodo.3250247.

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The solutions of many advanced engineering problems like Fick’s second law, heat and mass transfer problems, vibrating beams problems contains error and complementary error function. When we use any integral transform to solve these types of problems, it is very necessary to know the integral transform of error function. In this article, we find the Sadik transform of error and complementary error functions. To demonstrate the usefulness of Sadik transform of error function, some numerical applications are considered in application section for solving improper integrals which contain error function. It is pointed out that Sadik transform give the exact solution of improper integral which contains error function without any tedious calculation work.
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15

Pyatkov, Sergey, and Alexey Potapkov. "The Well-Posed Identification of the Interface Heat Transfer Coefficient Using an Inverse Heat Conduction Model." Mathematics 11, no. 23 (2023): 4739. http://dx.doi.org/10.3390/math11234739.

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In this study, the inverse problems of recovering the heat transfer coefficient at the interface of integral measurements are considered. The heat transfer coefficient occurs in the transmission conditions of an imperfect contact type. This is representable as a finite part of the Fourier series with time-dependent coefficients. The additional measurements are integrals of a solution multiplied by some weights. The existence and uniqueness of solutions in Sobolev classes are proven and the conditions on the data are sharp. These conditions include smoothness and consistency conditions on the data and additional conditions on the kernels of the integral operators used in the additional measurements. The proof relies on a priori bounds and the contraction mapping principle. The existence and uniqueness theorem is local in terms of time.
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16

Petržala, Jaromír. "Revision of path-integral approach to radiative transfer." Journal of Quantitative Spectroscopy and Radiative Transfer 270 (August 2021): 107670. http://dx.doi.org/10.1016/j.jqsrt.2021.107670.

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17

Hriberšek, M., and G. Kuhn. "Conjugate heat transfer by boundary-domain integral method." Engineering Analysis with Boundary Elements 24, no. 4 (2000): 297–305. http://dx.doi.org/10.1016/s0955-7997(00)00008-4.

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18

Ezquerro, J. A., J. M. Gutiérrez, M. A. Hernández, and M. A. Salanova. "Solving nonlinear integral equations arising in radiative transfer." Numerical Functional Analysis and Optimization 20, no. 7-8 (1999): 661–73. http://dx.doi.org/10.1080/01630569908816917.

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19

Singer, S. J., P. A. Maher, and M. P. Yaffe. "On the transfer of integral proteins into membranes." Proceedings of the National Academy of Sciences 84, no. 7 (1987): 1960–64. http://dx.doi.org/10.1073/pnas.84.7.1960.

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20

Li, Xiang-Yuan, An-Min Tian, Fu-Cheng He, and Guo-Sen Yan. "Electron transfer integral between two zero-overlap states." Journal of Computational Chemistry 17, no. 9 (1996): 1108–11. http://dx.doi.org/10.1002/(sici)1096-987x(19960715)17:9<1108::aid-jcc3>3.0.co;2-w.

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21

Song, Xingkun. "Quantum state transfer on integral oriented circulant graphs." Applied Mathematics and Computation 464 (March 2024): 128391. http://dx.doi.org/10.1016/j.amc.2023.128391.

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22

Khan, W. A., J. R. Culham, and M. M. Yovanovich. "Fluid Flow and Heat Transfer in Power-Law Fluids Across Circular Cylinders: Analytical Study." Journal of Heat Transfer 128, no. 9 (2006): 870–78. http://dx.doi.org/10.1115/1.2241747.

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An integral approach of the boundary layer analysis is employed for the modeling of fluid flow around and heat transfer from infinite circular cylinders in power-law fluids. The Von Karman-Pohlhausen method is used to solve the momentum integral equation whereas the energy integral equation is solved for both isothermal and isoflux boundary conditions. A fourth-order velocity profile in the hydrodynamic boundary layer and a third-order temperature profile in the thermal boundary layer are used to solve both integral equations. Closed form expressions are obtained for the drag and heat transfer coefficients that can be used for a wide range of the power-law index, and generalized Reynolds and Prandtl numbers. It is found that pseudoplastic fluids offer less skin friction and higher heat transfer coefficients than dilatant fluids. As a result, the drag coefficients decrease and the heat transfer increases with the decrease in power-law index. Comparison of the analytical models with available experimental/numerical data proves the applicability of the integral approach for power-law fluids.
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23

Rodríguez Román, Francisco Javier. "Defensa integral penitenciaria." Revista de Artes Marciales Asiáticas 4, no. 4 (2012): 86. http://dx.doi.org/10.18002/rama.v4i4.153.

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&lt;p&gt;Penitentiary integral defense is a set of techniques designed to solve the breach of the peace that may appear in the penitentiary world. This paper studies the scope and legal framework of penitentiary self-defense. This kind of self-defense is defined by the particular characteristics of a confinement context and a very specific regulation aimed at preserving the integrity of prisoners and penitentiary staff as well as prison facilities. A technical section illustrating the main penitentiary integral defense’s fundamentals and methods is also included. The defense methods showed here are: frisking, confinement cell entry, prisoner transfer, active resistance, aggressions between prisoners, standard defense equipment, handcuffs use, and techniques against holds, non-armed attacks and attacks with an edged weapon.&lt;/p&gt;
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24

Thynell, S. T., and M. N. Özi§ik. "Integrals involving an exponential integral function and exponentials arising in the solution of radiation transfer." Journal of Quantitative Spectroscopy and Radiative Transfer 33, no. 3 (1985): 259–66. http://dx.doi.org/10.1016/0022-4073(85)90155-4.

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25

Angeles-Canul, R. J., R. M. Norton, M. C. Opperman, C. C. Paribello, M. C. Russell, and C. Tamon. "Perfect state transfer, integral circulants, and join of graphs." Quantum Information and Computation 10, no. 3&4 (2010): 325–42. http://dx.doi.org/10.26421/qic10.3-4-10.

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We propose new families of graphs which exhibit quantum perfect state transfer. Our constructions are based on the join operator on graphs, its circulant generalizations, and the Cartesian product of graphs. We build upon the results of Ba\v{s}i\'{c} and Petkovi\'{c} ({\em Applied Mathematics Letters} {\bf 22}(10):1609-1615, 2009) and construct new integral circulants and regular graphs with perfect state transfer. More specifically, we show that the integral circulant $\textsc{ICG}_{n}(\{2,n/2^{b}\} \cup Q)$ has perfect state transfer, where $b \in \{1,2\}$, $n$ is a multiple of $16$ and $Q$ is a subset of the odd divisors of $n$. Using the standard join of graphs, we also show a family of double-cone graphs which are non-periodic but exhibit perfect state transfer. This class of graphs is constructed by simply taking the join of the empty two-vertex graph with a specific class of regular graphs. This answers a question posed by Godsil (arxiv.org math/08062074).
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26

Philippov, M. V., I. A. Chokhar, V. V. Terekhov, and V. I. Terekhov. "Experimental study of the heat transfer of two parallel impinging jets." Journal of Physics: Conference Series 2119, no. 1 (2021): 012029. http://dx.doi.org/10.1088/1742-6596/2119/1/012029.

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Abstract Local and integral characteristics of heat transfer are obtained at varying the Reynolds number Re = 5500, 11000, the distance between the jets y/D = 1.8, and the distance from the jets to the surface z/D = 0.5-10 for the system of two identical impinging jets. It is found in experiments that the effect of an adjacent jet leads to enhancement of local heat transfer at large distances between the nozzles and the barrier. It is also shown that an increase in the Re number increases integral heat transfer, and, at the same time, weakens the inter-jet interaction. The paper analyzes the scenarios of the behavior of local and integral heat transfer depending on the geometric and flow parameters of the system of two circular turbulent jets.
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27

Maitama, Shehu, and Weidong Zhao. "New Laplace-type integral transform for solving steady heat-transfer problem." Thermal Science, no. 00 (2019): 160. http://dx.doi.org/10.2298/tsci180110160m.

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The fundamental purpose of this paper is to propose a new Laplace-type integral transform (NL-TIT) for solving steady heat-transfer problems. The proposed integral transform is a generalization of the Sumudu, and the Laplace transforms and its visualization is more comfortable than the Sumudu transform, the natural transform, and the Elzaki transform. The suggested integral transform is used to solve the steady heat-transfer problems, and results are compared with the results of the existing techniques.
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28

Kebeba, Nimona Ketema, and Gizaw Debito Haifo. "Analysis of Two-Dimensional Heat Transfer Problem Using the Boundary Integral Equation." Advances in Mathematical Physics 2022 (November 14, 2022): 1–7. http://dx.doi.org/10.1155/2022/1889774.

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In this paper, we examine the problem of two-dimensional heat equations with certain initial and boundary conditions being considered. In a two-dimensional heat transport problem, the boundary integral equation technique was applied. The problem is expressed by an integral equation using the fundamental solution in Green’s identity. In this study, we transform the boundary value problem for the steady-state heat transfer problem into a boundary integral equation and drive the solution of the two-dimensional heat transfer problem using the boundary integral equation for the mixed boundary value problem by using Green’s identity and fundamental solution.
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29

Langlois, Adam, and Pierre D. Harvey. "Maple™-assisted calculations of the J-integral: a key parameter for the understanding of excited state energy transfer in porphyrins and other chromophores." Journal of Porphyrins and Phthalocyanines 18, no. 08n09 (2014): 666–74. http://dx.doi.org/10.1142/s1088424614500400.

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The spectral overlap between the emission of a donor molecule and the absorption of an acceptor molecule, quantifiable using the J-integral calculation, is a parameter of extreme importance when studying the excited state energy transfer by either the Főrster or Dexter mechanism. Despite its extreme importance in both mechanisms, it is often misinterpreted, approximated or incorrectly calculated. The calculation of the J-integral is not trivial especially when one wishes to carry out the calculation on measured spectroscopic data. A detailed description for the correct calculation of the J-integral is herein reported and presents a Maple™ assisted template that is capable of performing this calculation in the two different energy scales (nm and cm-1) to yield the value of the J-integral in given units. Specific examples using porphyrin-containing compounds are provided. This Maple™ program is flexible and can be easily adapted to the needs of a researcher. A call for the standardization of the calculation of the J-integral for the facile comparison with other overlap integrals found in the literature is made.
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30

Wu, S. H., and C. Y. Wu. "Integral Equation Solutions for Transient Radiative Transfer in Nonhomogeneous Anisotropically Scattering Media." Journal of Heat Transfer 122, no. 4 (2000): 818–23. http://dx.doi.org/10.1115/1.1315596.

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The integral equation formulation for transient radiative transfer in two-dimensional cylindrical nonhomogeneous absorbing and linearly anisotropically scattering media with collimated pulse irradiation is presented. The integral equations are solved by the quadrature method. The results by the present method agree quite well with those obtained by the Monte Carlo method. The effects of spatially variable properties on transient radiative transfer are investigated for various optical sizes and extinction coefficient distributions. The blocking effect on transient two-dimensional radiative transfer in nonhomogeneous media is different from that on steady-state radiative transfer. [S0022-1481(00)00204-8]
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31

Tan, Zhiqiang. "Radiative Heat Transfer in Multidimensional Emitting, Absorbing, and Anisotropic Scattering Media—Mathematical Formulation and Numerical Method." Journal of Heat Transfer 111, no. 1 (1989): 141–47. http://dx.doi.org/10.1115/1.3250636.

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Thermal radiative transmission in multidimensional emitting, absorbing, and anisotropic scattering media is studied in this paper. In the first part, starting from basic formulae of radiative heat transfer, a set of integral equations for the problem is derived. Then the product-integration method is applied to discretize the integral equations. This method, while analogous to Hottel’s zonal method or Razzaque’s finite element method, requires evaluation of only three or two-dimensional integrals for three-dimensional systems. Finally the formulation and the numerical technique are applied to the problems of thermal radiation in emitting, absorbing, and linearly anisotropic scattering planar and square media with gray surfaces and with or without internal heat generations. Computed results are discussed and compared with available data.
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32

Fujimoto, Kazuhiro J. "Transition-density-fragment interaction combined with transfer integral approach for excitation-energy transfer via charge-transfer states." Journal of Chemical Physics 137, no. 3 (2012): 034101. http://dx.doi.org/10.1063/1.4733669.

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33

Egab, Karim, Hassan Raheem Hassan, Ali A. Khalaf, et al. "Study the Effect of Heat Transfer Coefficient and Thermal Conductivity on Cracked Pipes Carrying Pressurized Fluid." International Journal of Engineering & Technology 7, no. 4.19 (2018): 720–26. http://dx.doi.org/10.14419/ijet.v7i4.19.27988.

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The cylindrical pipes carrying pressurized fluid at high-temperature environment have many engineering applications such as cooling systems of the power plant. In this paper, the effect of the presence of crack and the thermal stress distribution of the pipe has been studied numerically. The “mode I” type of crack has been considered for the study. The stress distributions, stress intensity factor and J-integral calculations were considered. The results have been validated with an available analytical solution for a pristine cylinder. Special attention and mesh scheme has been used around the crack to obtain the accurate stress distributions. The temperature and stress variations for pressurized fluids with different heat transfer coefficients and pipe’s conductivity were studied. It was found that the convection heat transfer coefficient has an accountable effect on the stress distributions. The stresses increased by 5% for different heat transfer coefficient without cracks. Moreover, the stress intensity factor and the J-integrals were calculated for different crack length ratios. The stress intensity factor increased by 14% when the crack length ratio is 0.7. In addition, the effect of pipe thermal conductivity has been studied. It was found that the thermal conductivity influences the stress distributions, stress intensity factor and J-integral values. The stresses decreased by 15% with increasing the thermal conductivity without cracks, the J-integral and the stress intensity factor decreases as the thermal conductivity of the pipe increases for different crack length ratios. Â
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34

Shevchuk, I. V., N. Saniei, and X. T. Yan. "Impingement Heat Transfer over a Rotating Disk: Integral Method." Journal of Thermophysics and Heat Transfer 17, no. 2 (2003): 291–93. http://dx.doi.org/10.2514/2.6767.

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35

Laskin, N., and I. Tomski. "Path integral approach to non-relativistic electron charge transfer." Journal of Physics B: Atomic, Molecular and Optical Physics 34, no. 22 (2001): 4359–69. http://dx.doi.org/10.1088/0953-4075/34/22/307.

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36

Tibaut, J., and J. Ravnik. "Fast boundary-domain integral method for heat transfer simulations." Engineering Analysis with Boundary Elements 99 (February 2019): 222–32. http://dx.doi.org/10.1016/j.enganabound.2018.12.003.

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37

Purcell, Janine A., and Bruce G. Coury. "Asymmetric Transfer of Training between Integral and Separable Displays." Proceedings of the Human Factors Society Annual Meeting 32, no. 19 (1988): 1366–70. http://dx.doi.org/10.1177/154193128803201913.

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The type of display employed during operator training may affect the formation of an operator's internal model of the system. In this experiment subjects were divided into two groups and trained to classify instances of system state using either a configural or digital display. During extended practice the subjects were then switched to the alternate display type; those trained on the configural display now worked with the digital display, and vice versa. Results indicate that asymmetric transfer of training occurred; those who switched from the digital to the configural display outperformed the other group by a significant margin in terms of accuracy. Results are discussed in terms of the impact of display type on the formation of the operator's internal model and bias of processing strategy in transfer situations.
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38

Zerarka, A., A. Soukeur, and N. Bensalah. "Integral Reduction Arising in Double Transfer and Excitation Amplitude." Communications in Theoretical Physics 53, no. 3 (2010): 551–54. http://dx.doi.org/10.1088/0253-6102/53/3/28.

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39

Harriott, George M. "Memory-integral mass-transfer models for adsorption process simulation." AIChE Journal 39, no. 3 (1993): 422–33. http://dx.doi.org/10.1002/aic.690390306.

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40

Mieck, B. "Path Integral and Transfer Matrix Approach with Graded Variables." Fortschritte der Physik 47, no. 5 (1999): 515–82. http://dx.doi.org/10.1002/(sici)1521-3978(199906)47:5<515::aid-prop515>3.0.co;2-5.

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41

Khalida, Zulfa, Kartika Candra Dewi, Siti Musyarrofah, and Hadi Rahmad. "OPTIMALIZATION OF INTEGRAL FIN TUBE IN OUTSIDE CONDENSATION BASED ON FLOODING ANGLE." Jurnal Teknik Mesin 2, no. 2 (2023): 230–36. http://dx.doi.org/10.33795/j-meeg.v2i2.4731.

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Increasing heat transfer in condensation for low surface tension fluid is dominated by using extended area (fin). One of the extended area on pipe is integral fin tube. Designing of integral fin tube should be conducted due to generate optimal condition such as designing fin spacing. Fin spacing has significantly impacted to heat transfer enhancement. Whereas the material of pipe is copper since has higher heat conductivity than others and fluid working is methanol. To predict optimal geometry of integral fin tube is conducted by using mathematical simulation by dividing area into flooded and unflooded. The active area or unflooded area represents the heat transfer area adn enhancement. In this experiment is found that the optimum fin spasing is 1 mm
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42

Zheng, Ying Jie, Xue Dai, and Lian Xiang Li. "Analysis of an O-Cell Pile Test in Jinan with FEM." Applied Mechanics and Materials 170-173 (May 2012): 33–36. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.33.

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In order to promote the experience of applying O-cell pile test to determine the behaviors of integral pile in Jinan, a case of O-cell pile test in Jinan was analyzed with proposed approach. The pile-soil system was simulated with FEM. The resistance parameters of piles, the load-displacement curves and the ultimate bearing capacity of integral pile were determined. Comparing with results obtained from load transfer method, it is found that the p-s curve of integral pile obtained from load transfer method is conservative.
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43

Taher, Farah Abdulzahra, and Zena Khalefa Kadhim. "PRACTICAL STUDY TO IMPROVEMENT THE PERFORMANCE OF HEAT EXCHANGER USING PASSIVE TECHNIQUES." International Journal of Engineering Technologies and Management Research 6, no. 8 (2020): 21–33. http://dx.doi.org/10.29121/ijetmr.v6.i8.2019.437.

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The aim of this study to improve the performance of heat exchanger by using the medium integral fins on the cross flow heat exchanger practically, so, two the heat exchangers from copper were manufactures with eight passes for comparison under different boundary conditions. The water flow rate flow inner the tubes with (2, 3, 4, 5, 6) L/min with inlet temperatures (50, 60, 70) oC, as for the air flow rate were passed outer the tubes by speeds (1, 1.7, 2.3) m/sec. The results show that the medium integral finned tube gives more improvement the heat transfer than the smooth tube about 203.97% and 205.1% was enhancement factor. Motivation: The aim is improvement the heat transfer coefficient for cross flow heat exchanger by using medium integral finned tube. Study the effect of various water stream rate, air speed and inlet water temperature on heat transfer coefficient for them, Finding the cases which enhanced heat transfer for various ranges of air and water as well as inlet temperatures and the speed at the entrance. Develop the empirical correlations for (Nua) of smooth and medium integral finned tubes as function of (Pra) and (Rea).
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44

Farah, Abdulzahra Taher, and Zena Khalefa Kadhim Dr. "PRACTICAL STUDY TO IMPROVEMENT THE PERFORMANCE OF HEAT EXCHANGER USING PASSIVE TECHNIQUES." International Journal of Engineering Technologies and Management Research 6, no. 8 (2019): 21–33. https://doi.org/10.5281/zenodo.3370525.

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The aim of this study to improve the performance of heat exchanger by using the medium integral fins on the cross flow heat exchanger practically, so, two the heat exchangers from copper were manufactures with eight passes for comparison under different boundary conditions. The water flow rate flow inner the tubes with (2, 3, 4, 5, 6) L/min with inlet temperatures (50, 60, 70) oC, as for the air flow rate were passed outer the tubes by speeds (1, 1.7, 2.3) m/sec. The results show that the medium integral finned tube gives more improvement the heat transfer than the smooth tube about 203.97% and 205.1% was enhancement factor. Motivation: The aim is improvement the heat transfer coefficient for cross flow heat exchanger by using medium integral finned tube. Study the effect of various water stream rate, air speed and inlet water temperature on heat transfer coefficient for them, Finding the cases which enhanced heat transfer for various ranges of air and water as well as inlet temperatures and the speed at the entrance. Develop the empirical correlations for (Nua) of smooth and medium integral finned tubes as function of (Pra) and (Rea).
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45

Blancafort, Lluís, and Alexander A. Voityuk. "Direct estimation of the transfer integral for photoinduced electron transfer from TD DFT calculations." Physical Chemistry Chemical Physics 19, no. 46 (2017): 31007–10. http://dx.doi.org/10.1039/c7cp06152h.

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46

Yang, Xiao-Jun. "A new integral transform with an application in heat-transfer problem." Thermal Science 20, suppl. 3 (2016): 677–81. http://dx.doi.org/10.2298/tsci16s3677y.

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In this paper, an new integral transform J[?(?)] =1/? ?0??(?)e??? d? is proposed for the first time. The integral transform is used to solve the differential equation arising in heat-transfer problem.
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47

Chang, J. Y., and S. M. You. "Enhanced Boiling Heat Transfer From Micro-Porous Cylindrical Surfaces in Saturated FC-87 and R-123." Journal of Heat Transfer 119, no. 2 (1997): 319–25. http://dx.doi.org/10.1115/1.2824226.

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The present research is an experimental study of pool boiling heat transfer from cylindrical heater surfaces immersed in saturated FC-87 and R-123. The baseline heater surfaces tested are plain, integral-fin with 709 fins/m, and commercial enhanced (High-Flux and Turbo-B). In addition, a highly effective micro-scale enhancement coating is applied to the plain and integral-fin surfaces to augment nucleate boiling heat transfer. Experiments are performed to understand the effects of surface micro- and macro-geometries on boiling heat transfer. The boiling performance of the micro-porous enhanced plain and integral-fin surfaces are compared with the High-Flux and the Turbo-B surfaces. At high heat flux conditions, the break down of the bulk liquid feed mechanism reduces boiling enhancement from the cylindrical surfaces.
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48

Su, Shanjie, Feng Gao, Zekai Wang, and Menglin Du. "Applications of the Fourier-like integral transform in the wave and heat-transfer problems." Thermal Science 23, Suppl. 3 (2019): 703–9. http://dx.doi.org/10.2298/tsci180520084s.

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In this article, some new properties of a novel integral transform termed the Fourier-Yang are explored. The Fourier-Yang integral transforms of several basic functions are given firstly. With the aid of the new integral transform, a 1-D wave equation and 2-D heat transfer equation are solved. The results show that the Fourier-Yang integral transform is efficient in solving PDE.
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49

Feng, Zhi-Gang, and E. E. Michaelides. "Transient Heat Transfer From a Particle With Arbitrary Shape and Motion." Journal of Heat Transfer 120, no. 3 (1998): 674–81. http://dx.doi.org/10.1115/1.2824336.

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A singular perturbation analysis and Green’s second theorem are used in order to obtain a general expression for the heat transfer from a particle at low Peclet numbers, when advection and conduction are heat transfer modes of comparable magnitude. The particle may have arbitrary shape, and its motion in the fluid is not constrained to be Stokesian. In the ensuring analysis, the governing equations for the temperature fields at short and long times are derived. The expressions are combined to yield a general equation for the temperature field and for the total rate of heat transfer. The final results for the rate of heat transfer demonstrate the existence of a history integral, whose kernel decays faster than the typical history integrals of the purely conduction regime. As applications of the general results, analytical expressions for the Nusselt number are derived in the case of a sphere undergoing a step temperature change.
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50

Vasiliy, Horoshko. "CONTROL OPTIMIZATION OF ELECTROMECHANICAL SYSTEMS BY FRACTIONAL-INTEGRAL CONTROLLERS." TECHNOLOGY AUDIT AND PRODUCTION RESERVES 3, no. 2(53) (2020): 56–59. https://doi.org/10.15587/2706-5448.2020.207037.

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<em>The object of research in the work is electromechanical systems, a characteristic feature of which is the presence of significant power dependence in the mathematical description. Because of this, problems arise when choosing the structure and parameters of controllers. In particular, in a DC motor with series excitation, a switched reluctance motor and electromagnetic retarders, saturation of the magnetic system in static and dynamic modes can occur. The apparatus of fractional-integral calculus used in the work allows us to describe such nonlinear objects with high accuracy by linear transfer functions of fractional order. So, when approximating the anchor circuit of a DC motor with series excitation by a fractional transfer function, the smallest standard error was obtained. The combination of a conventional PID controller with fractional integral components of the order of 0.35 and 1.35 ensured the best quality of the transient process - the current reaches the set value as quickly as possible without overshoot. Secondly, the switched reluctance motor, in the model of which it is necessary to take into account the power dependences, is described by the aperiodic function of the order of 0.7 when describing the transient processes of the speed during a voltage jump. From the family of controllers studied, the traditional PI controller with additional fractional-integral components of the order of 0.7 and 1.7 ensured the astaticism of the speed loop of the order of 1.7 and the smallest overshoot. Thirdly, the electromagnetic retarders of the driving wheels of a car, used to tune the internal combustion engine, are also most accurately described after testing by the fractional transfer function. Using the PIDI</em><em><sup>&gamma;</sup></em><em>I<sup>&micro;</sup>&nbsp;controller, which ensured closed loop astaticism of the order of 1.63, stabilization of the rotation speed of two wheels without out-of-phase oscillations and the accurate development of a triangular tachogram were achieved. Thus, thanks to the apparatus of fractional-integral calculus, a more accurate identification of object parameters is provided, the mathematical description is reduced to linear transfer functions of fractional order. And in closed systems it is possible to ensure astaticism of fractional order 1.3&ndash;1.7 and to achieve a better quality of transient processes than using classical methods.</em>
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