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Статті в журналах з теми "Temperature coupling"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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1

Hu, Zheng, Yu-Chen Wang, and Xi-Wen Hou. "Thermal quantum correlations in a two-qubit Heisenberg XYZ model with different magnetic fields." International Journal of Quantum Information 13, no. 06 (September 2015): 1550046. http://dx.doi.org/10.1142/s021974991550046x.

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Two kinds of thermal quantum correlations, measured respectively by quantum discord (QD) and the generalized negativity (GN), are studied for various magnetic fields, couplings, and temperatures in a two-qubit Heisenberg XYZ model. It is shown that QD and GN can exhibit a similar behavior in some regions of magnetic field, coupling, and temperature, while they behave in a contrary manner in other regions. For example, QD may increase with suitable magnetic fields, couplings, and temperature when GN decreases. QD is more robust against temperature than GN, and can reveal a kink at a suitable coupling at finite temperature while GN cannot. Moreover, a nearly unchanged QD or GN can be obtained in a large region of magnetic field, coupling, and temperature. These adjustable QD and GN via the varied magnetic field, coupling, and temperature may have significant applications in quantum information processing.

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2

Zhou, Ye, and Su-Ting Han. "Room-temperature magnetoelastic coupling." Science 367, no. 6478 (February 6, 2020): 627–28. http://dx.doi.org/10.1126/science.aba6642.

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3

Fazel, Mohamadreza, Behrouz Mirza, and Seyed Ali Hosseini Mansoori. "Black hole temperature: Minimal coupling vs conformal coupling." Annals of Physics 344 (May 2014): 232–52. http://dx.doi.org/10.1016/j.aop.2014.02.020.

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4

OPASIAK, Tadeusz, Jerzy MARGIELEWICZ, Damian GĄSKA, and Tomasz HANISZEWSKI. "INFLUENCE OF CHANGES IN THE WORKING TEMPERATURE OF FLEXIBLE COUPLINGS ON THEIR STIFFNESS CHARACTERISTICS." Transport Problems 17, no. 4 (December 1, 2022): 177–86. http://dx.doi.org/10.20858/tp.2022.17.4.15.

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This article compares flexible couplings of the spider-type insert, and the tire-type insert. The influences of the volume and hardness of the elastomeric connector on the characteristics of this type of coupling, as well as the course of the change of the stiffness coefficient as a result of changes in the operating temperature, are presented. In drive systems, flexible couplings undergo very frequent changes within a wide range of operating temperatures, which causes a change in the dynamic parameters of the flexible couplings during operation.

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5

Lounila, Juhani, Yrjö Hiltunen, Kari Tuppurainen, Anja Pulkkinen, and Reino Laatikainen. "Solvent dependence of rotational energetics and formyl-proton long-range spin-spin coupling behavior of 2,6-dichloro- and 2,6-dinitrobenzaldehydes using dipolar couplings and temperature dependence of long-range couplings." Canadian Journal of Chemistry 77, no. 11 (November 1, 1999): 1788–96. http://dx.doi.org/10.1139/v99-198.

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The formyl rotational energetics, solvent effects on the energetics and formyl-proton spin-spin coupling behavior of 2,6-dichlorobenzaldehyde were studied by using dipolar couplings analysis and the temperature dependence of the spin-spin couplings. The general form of the rotational potential was taken from molecular mechanics and the conjugative sin2 Θ-type component (where Θ is the formyl-ring dihedral angle) was then optimized using the dipolar couplings obtained by analyzing 1H NMR and 13C proton satellite spectra in a liquid crystal solvent. The optimization based on the dipolar couplings gave the following rotational free energy potential: V(Θ) = 4.5 cos6 Θ + 10.7 (± 2.0) sin2 Θ, in kJ/mol. The analysis based on the temperature dependence of 6J data allowed estimation of solvent effects on the potential. For example, the potentials in acetone and in acetonitrile differ by a 1.0 sin2 2Θ (in kJ/mol). The chloroform solvent effect can be described by term of -1.0 cos6 Θ. When the formyl-proton six-bond coupling data was fit, assuming it obeyed the expression 6J(Θ) = 6J90 sin2 Θ + 6J0 and assuming 6J0 = 0.015 Hz, the analysis yielded 6J90 of -0.48 (± 0.03) Hz. The scalar coupling temperature dependence method was applied also to the conformational analysis of 2,6-dinitrobenzaldehyde.Key words: spin-spin coupling, dipolar coupling, solvent effect, rotational barrier, benzaldehyde.

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6

Shapiro, R. S., and Leah E. Cowen. "Coupling temperature sensing and development." Virulence 1, no. 1 (January 2010): 45–48. http://dx.doi.org/10.4161/viru.1.1.10320.

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7

Donoghue, John F., Barry R. Holstein, and R. W. Robinett. "Gravitational coupling at finite temperature." Physical Review D 34, no. 4 (August 15, 1986): 1208–9. http://dx.doi.org/10.1103/physrevd.34.1208.

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8

GUCZI, LÁSZLÓ, RUTGER A. VAN SANTEN, and K. V. SARMA. "Low-Temperature Coupling of Methane." Catalysis Reviews 38, no. 2 (May 1996): 249–96. http://dx.doi.org/10.1080/01614949608006459.

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9

Nakamura, Keiichi, Hitoshi Okubo, and Masahiko Yamaguchi. "Low Temperature Sonogashira Coupling Reaction." Synlett 1999, no. 5 (May 1999): 549–50. http://dx.doi.org/10.1055/s-1999-2684.

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10

EERDUNCHAOLU, WEI XIN, and YUWEI ZHAO. "INFLUENCE OF LATTICE VIBRATION ON THE GROUND STATE OF MAGNETOPOLARON IN A PARABOLIC QUANTUM DOT." Modern Physics Letters B 24, no. 27 (October 30, 2010): 2705–12. http://dx.doi.org/10.1142/s021798491002505x.

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Influence of the lattice vibration on the properties of the magnetopolaron in the parabolic quantum dots (QDs) is studied by using the Huybrechts' linear combination operator and Lee–Low–Pines (LLP) transformation methods. The expressions for the vibration frequency and the ground-state energy of the magnetopolaron as functions of the confinement strength of the QDs, the magnetic field and temperature are derived under the strong and weak coupling, respectively. The results of the numerical calculations show that the changes of the vibration frequency and ground-state energy of the magnetopolaron with the confinement strength of the QDs, the magnetic field and temperature are different under different couplings. The vibration frequency and the ground-state energy of the weak-coupling magnetopolaron and the vibration frequency of the strong-coupling magnetopolaron will increase with increase of the confinement strength of the QDs and cyclotron frequency, the vibration frequency and ground-state energy of the strong-coupling magnetopolaron. However, the ground-state energy of the weak-coupling magnetopolaron will decrease with increase of the temperature. The dependence of the ground-state energy of the strong-coupling magnetopolaron on the confinement strength of the QDs and cyclotron frequency is strongly influenced by the temperature. The remarkable influence of the temperature on the ground-state energy of the magnetopolaron arises when the temperature is relatively higher.

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11

Segel, S. L., R. J. C. Brown, E. E. Ylinen, L. P. Ingman, and T. J. Bastow. "Quadrupole Coupling in Ammonium Metaperiodate at Low Temperature." Zeitschrift für Naturforschung A 57, no. 8 (August 1, 2002): 661–62. http://dx.doi.org/10.1515/zna-2002-0804.

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The temperature dependences of the 127I nuclear quadrupole coupling in NH4IO4 and in ND4IO4 are reported. In each salt, the quadrupole coupling decreases to a very small value at low temperatures, and in the case of ND4IO4 passes through zero and changes sign at 87 K.

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12

Kurosawa, Gen, Atsuko Fujioka, Satoshi Koinuma, Atsushi Mochizuki, and Yasufumi Shigeyoshi. "Temperature–amplitude coupling for stable biological rhythms at different temperatures." PLOS Computational Biology 13, no. 6 (June 8, 2017): e1005501. http://dx.doi.org/10.1371/journal.pcbi.1005501.

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13

Thi Tran, Thanh-Mai, Duong-Bo Nguyen, Hong-Son Nguyen, and Minh-Tien Tran. "Magnetic competition in topological kagome magnets." Materials Research Express 8, no. 12 (December 1, 2021): 126101. http://dx.doi.org/10.1088/2053-1591/ac433c.

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Abstract Magnetic competition in topological kagome magnets is studied by incorporating the spin–orbit coupling, anisotropic Hund coupling and spin exchange into a tight-binding electron dynamics in the kagome lattice. Using the Bogoliubov variational principle we find the stable phases at zero and finite temperatures. At zero temperature and in the strong Ising-Hund coupling regime, a magnetic tunability from the out-of-plane ferromagnetism to the in-plane antiferromagnetism is achieved through a universal property of the critical in-plane Hund coupling. At low temperature the out-of-plane ferromagnetism is stable until a finite crossing temperature. Above the crossing temperature the in-plane antiferromagnetism is stable, but the magnetization of the out-of-plane ferromagnetism still survives. This suggests a metastable coexistence of these magnetic phases in a finite temperature range. A large anomalous Hall conductance is observed in the Ising-Hund coupling limit.

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14

Xu, Xiang Tian, Cai Xia Fan, and Tian Yu Zhang. "A Constitutive Model with Effect of Temperature for Frozen Soil." Advanced Materials Research 919-921 (April 2014): 627–31. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.627.

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To model the stress-strain relation of frozen soil under different temperatures, an elasto-plastic constitutive model coupling with temperature variable was proposed. Under axisymmetric condition, elastic strain was calculated by the K-G model coupling with temperature. The plastic strain was calculated by using the DP yield criterion, associated flow rule and isotropic hardening law. All of the elastic and plastic parameters are related to the temperature variable. The simulated results show that the proposed model can predict the deformation behavior of frozen soil under different temperatures.

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15

Bucchi, Francesco, Mohammad Elahinia, Paola Forte, and Francesco Frendo. "A Passive Magneto-Thermo-Mechanical Coupling Actuated by SMA Springs and MR Fluid." International Journal of Structural Stability and Dynamics 14, no. 08 (November 25, 2014): 1440031. http://dx.doi.org/10.1142/s0219455414400318.

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In the present paper, a passive magneto-thermo-mechanical coupling is conceived and developed. The system is designed to engage and disengage auxiliary devices such as a vacuum pump from an internal combustion engine. The coupling increases the transmissible torque of a magnetorheological (MR) clutch, under particular environmental conditions, i.e. for temperature below 20°C. At low temperatures the torque requirements become significantly greater than the nominal operating torque, due to the very low viscosity of the oil in the driven device (vacuum pump). The ON–OFF operation of the thermo-mechanical coupling is the result of two conventional compression springs and two opposing shape memory alloy (SMA) springs. At low temperature the conventional springs keep the coupling engaged, while, if the temperature rises over 90°C, the SMA springs disengages the coupling. At normal operation temperatures, the SMA coupling is disengaged, allowing for the MR clutch to operate as the primary clutch. The SMA springs were designed considering the particular constitutive properties of the material and the equilibrium of the system. A prototype of the mechanical coupling was manufactured considering the geometry of the MR clutch. The experimental results obtained with the prototype, in terms of relative axial position of the two halves of the coupling, appeared in fairly good agreement with the model.

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16

Danilov, M., and T. Forßbohm. "Temperatursensitiv schaltbare Kupplung/Temperature-Sensitive Coupling." Konstruktion 67, no. 09 (2015): 86–90. http://dx.doi.org/10.37544/0720-5953-2015-09-86.

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Vorspann: In diesem Artikel werden die Entwicklung und die Anwendung einer temperaturabhängig autonom schaltbaren, schlupf- und spielfreien Kupplung beschrieben. Ihr wesentlicher Zweck ist die Herstellung einer kraftschlüssigen Verbindung zwischen zwei oder mehreren Körpern, die beim Erreichen einer bestimmten vorgegebenen Temperatur verschwindet. Ausgehend von einer konkreten Anwendung aus dem Bereich des modernen Faserverbundleichtbaus wird die allgemeine Fragestellung abgeleitet und es werden verschiedene Lösungsansätze diskutiert mit dem Ziel die Auswahl des schlussendlich weiterentwickelten Konzeptes zu begründen. Im letzten Teil des Artikels werden die Auslegung der Kupplungselemente detailliert dargestellt und ihre Merkmale diskutiert.

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17

VAN EIJCK, M. A., C. R. STEPHENS, and CH G. VAN WEERT. "TEMPERATURE DEPENDENCE OF THE QCD COUPLING." Modern Physics Letters A 09, no. 04 (February 10, 1994): 309–20. http://dx.doi.org/10.1142/s0217732394000320.

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We present a one-loop calculation of a gauge invariant QCD β-function. Using both momentum and temperature renormalization group equations we investigate the running coupling in the magnetic sector as a function of temperature and momentum scale. At fixed momentum scale we find that, in contrast to λɸ4 or QED, high temperature QCD is strongly coupled, even after renormalization group improvement. However, if the momentum scale is changed simultaneously with temperature in a specified manner, the coupling decreases. We also point out in what regime dimensional reduction occurs. Both the cases Nf smaller and larger than [Formula: see text] are discussed.

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18

Xia, Ke, Weiyi Zhang, Mu Lu, and Hongru Zhai. "Temperature dependence of noncollinear interlayer coupling." Physics Letters A 230, no. 3-4 (June 1997): 223–28. http://dx.doi.org/10.1016/s0375-9601(97)00238-7.

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19

Dominguez, C. A., C. van Gend, and M. Loewe. "Pion-nucleon coupling at finite temperature." Physics Letters B 429, no. 1-2 (June 1998): 64–71. http://dx.doi.org/10.1016/s0370-2693(98)00453-5.

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20

Schwieger, S., J. Kienert, K. Lenz, J. Lindner, K. Baberschke, and W. Nolting. "Temperature dependence of interlayer exchange coupling." Journal of Magnetism and Magnetic Materials 310, no. 2 (March 2007): 2301–3. http://dx.doi.org/10.1016/j.jmmm.2006.10.1038.

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21

Enqvist, K., and K. Kainulainen. "The running coupling at finite temperature." Zeitschrift f�r Physik C Particles and Fields 53, no. 1 (March 1992): 87–89. http://dx.doi.org/10.1007/bf01483876.

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22

Pires, Anthony, and Ronald R. Hoy. "Temperature coupling in cricket acoustic communication." Journal of Comparative Physiology A 171, no. 1 (August 1992): 69–78. http://dx.doi.org/10.1007/bf00195962.

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23

Pires, Anthony, and Ronald R. Hoy. "Temperature coupling in cricket acoustic communication." Journal of Comparative Physiology A 171, no. 1 (August 1992): 79–92. http://dx.doi.org/10.1007/bf00195963.

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24

SLICHTER, CHARLES P., ROBERT COREY, NICHOLAS CURRO, JUËRGEN HAASE, CRAIG MILLING, DIRK MORR, JÖRG SCHMALIAN, and RAIVO STERN. "J-coupling in high temperature superconductors." Molecular Physics 95, no. 5 (December 1998): 897–906. http://dx.doi.org/10.1080/002689798166521.

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25

Malozemoff, A. P., L. Krusin-Elbaum, and J. R. Clem. "Interlayer coupling in high temperature superconductors." Physica C: Superconductivity and its Applications 162-164 (December 1989): 353–54. http://dx.doi.org/10.1016/0921-4534(89)91051-4.

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26

Weldon, H. Arthur. "The λφ4 coupling at high temperature". Physics Letters B 174, № 4 (липень 1986): 427–28. http://dx.doi.org/10.1016/0370-2693(86)91030-0.

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27

Akhmetov, Fedor, Nikita Medvedev, Igor Makhotkin, Marcelo Ackermann, and Igor Milov. "Effect of Atomic-Temperature Dependence of the Electron–Phonon Coupling in Two-Temperature Model." Materials 15, no. 15 (July 26, 2022): 5193. http://dx.doi.org/10.3390/ma15155193.

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Ultrafast laser irradiation of metals can often be described theoretically with the two-temperature model. The energy exchange between the excited electronic system and the atomic one is governed by the electron–phonon coupling parameter. The electron–phonon coupling depends on both, the electronic and the atomic temperature. We analyze the effect of the dependence of the electron–phonon coupling parameter on the atomic temperature in ruthenium, gold, and palladium. It is shown that the dependence on the atomic temperature induces nonlinear behavior, in which a higher initial electronic temperature leads to faster electron–phonon equilibration. Analysis of the experimental measurements of the transient thermoreflectance of the laser-irradiated ruthenium thin film allows us to draw some, albeit indirect, conclusions about the limits of the applicability of the different coupling parametrizations.

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28

Tao, Jing Qing, Lin Dong, Zhei Wei Liu, and Jie Yang. "Effect of Normal Pressure on the Coupled Temperature Field of Pin-Disc in Electromagnetic Environment." Advanced Materials Research 941-944 (June 2014): 2436–39. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.2436.

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Based on the FE software ANSYS, the coupling temperature fields of pin-disc friction pair were simulated and analyzed in pin-disc friction rig. The results show that the temperatures of pin-disc friction pair with magnetic field are higher than that without magnetic field, under the same relative displacement, speed and normal pressure. The maximum coupling temperature increase slowly and then increase quickly with the increasing of normal pressure, under the constant magnetic field intensity and speed. The maximum coupling temperature decreases with the increase of relative speed, when the relative sliding distance and magnetic field intensity are constant.

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29

MASOOD, SAMINA S., and MAHNAZ HASEEB. "SECOND-ORDER CORRECTIONS TO QED COUPLING AT LOW TEMPERATURE." International Journal of Modern Physics A 23, no. 29 (November 20, 2008): 4709–19. http://dx.doi.org/10.1142/s0217751x08041712.

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We calculate the second-order corrections to vacuum polarization tensor of photons at low temperatures, i.e. T ≪ 1010 K (T ≪ me). The thermal contributions to the QED coupling constant are evaluated at temperatures below the electron mass that is T < me. Renormalization of QED at these temperatures has explicitly been checked. The electromagnetic properties of such a thermal medium are modified. Parameters like electric permittivity and magnetic permeability of such a medium are no more constant and become functions of temperature.

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30

Hindmarsh, Richard C. A. "Thermomechanical coupling of ice flow with the bedrock." Annals of Glaciology 37 (2003): 390–96. http://dx.doi.org/10.3189/172756403781815988.

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AbstractTwo aspects of thermal coupling with bedrock are considered: the coupled time-dependent problem of co-evolving temperatures in lithosphere and ice; and the influence of basal topography on steady temperature distribution within the ice. The nature of the time-dependent coupling is found to depend on the horizontal velocity. As has been suggested, there is a cooling of steady temperatures on bedrock highs, but this is phase-shifted downstream when horizontal velocities increase. This observation may have consequences for geomorphological processes such as plucking and protection. The effect of bedrock channelling on steady temperature is considered. The positive anomaly of basal temperature due to channelling increases as the transverse wavelength decreases, but not monotonically, reaching a plateau when both the wavelengths of the basal topography are around 100 km.

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31

LI, DA-CHUANG, and ZHUO-LIANG CAO. "EFFECT OF DIFFERENT DZYALOSHINSKII–MORIYA INTERACTIONS ON ENTANGLEMENT IN THE HEISENBERG XYZ CHAIN." International Journal of Quantum Information 07, no. 02 (March 2009): 547–57. http://dx.doi.org/10.1142/s0219749909005146.

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In this paper, we study the thermal entanglement in a two-qubit Heisenberg XYZ system with different Dzyaloshinskii–Moriya (DM) couplings. We show that different DM coupling parameters have different influences on the entanglement and the critical temperature. In addition, we find that when Ji (i-component spin coupling interaction) is the largest spin coupling coefficient, Di (i-component DM interaction) is the most efficient DM control parameter, which can be obtained by adjusting the direction of DM interaction.

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32

Dell’Anna, Luca, and Stefano Grava. "Critical Temperature in the BCS-BEC Crossover with Spin-Orbit Coupling." Condensed Matter 6, no. 2 (April 30, 2021): 16. http://dx.doi.org/10.3390/condmat6020016.

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We review the study of the superfluid phase transition in a system of fermions whose interaction can be tuned continuously along the crossover from Bardeen–Cooper–Schrieffer (BCS) superconducting phase to a Bose–Einstein condensate (BEC), also in the presence of a spin–orbit coupling. Below a critical temperature the system is characterized by an order parameter. Generally a mean field approximation cannot reproduce the correct behavior of the critical temperature Tc over the whole crossover. We analyze the crucial role of quantum fluctuations beyond the mean-field approach useful to find Tc along the crossover in the presence of a spin–orbit coupling, within a path integral approach. A formal and detailed derivation for the set of equations useful to derive Tc is performed in the presence of Rashba, Dresselhaus and Zeeman couplings. In particular in the case of only Rashba coupling, for which the spin–orbit effects are more relevant, the two-body bound state exists for any value of the interaction, namely in the full crossover. As a result the effective masses of the emerging bosonic excitations are finite also in the BCS regime.

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33

Hou, Liping, Qifa Wang, Hanmou Zhang, Puhui Wang, Xuetao Gan, Fajun Xiao, and Jianlin Zhao. "Simultaneous control of plasmon–exciton and plasmon–trion couplings in an Au nanosphere and monolayer WS₂ hybrid system." APL Photonics 7, no. 2 (February 1, 2022): 026107. http://dx.doi.org/10.1063/5.0078243.

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Simultaneous control of plasmon–exciton and plasmon–trion couplings is fundamentally interesting for tailoring the strong light–matter interaction at the nanoscale and is intriguing for developing high-efficiency optoelectronic and nonlinear photonic devices. Here, we integrate the monolayer WS2 with the Au nanosphere to take full advantages of both the strong excitonic effect and local field enhancement effect to realize strong resonance couplings between the dipolar plasmon mode and the exciton, as well as the trion, at room temperature. Interestingly, from the dark-field scattering spectrum, a transition from the dominated plasmon–exciton coupling to the plasmon–exciton–trion coupling in the hybrid system by simply increasing the radius of the nanosphere is revealed. This evolution of the scattering spectrum is further analyzed using the coupled-oscillator model to extract Rabi splittings of 89 and 48 meV for plasmon–exciton and plasmon–trion couplings, implying that the hybrid system enters the moderate coupling region. The moderate coupling imparts the hybrid system with a remarkable light-emitting capacity, rendering 1265- and 680-fold photoluminescence (PL) enhancement for the exciton and trion emissions, respectively. Our findings provide a facile way for the manipulation of excitonic quasiparticles in semiconductors at room temperature.

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34

Cugliandolo, Leticia F., and Jorge Kurchan. "Aging and Effective Temperatures in the Low Temperature Mode-Coupling Equations." Progress of Theoretical Physics Supplement 126 (1997): 407–14. http://dx.doi.org/10.1143/ptps.126.407.

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35

Cugliandolo, L. F., and J. Kurchan. "Aging and Effective Temperatures in the Low Temperature Mode-Coupling Equations." Progress of Theoretical Physics Supplement 126 (May 16, 2013): 407–14. http://dx.doi.org/10.1143/ptp.126.407.

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36

Halim, Nur Diyana, Muhammad Safwan Zaini, Zainal Abidin Talib, Josephine Ying Chyi Liew, and Mazliana Ahmad Kamarudin. "Study of the Electron-Phonon Coupling in PbS/MnTe Quantum Dots Based on Temperature-Dependent Photoluminescence." Micromachines 13, no. 3 (March 15, 2022): 443. http://dx.doi.org/10.3390/mi13030443.

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The temperature dependence of photoluminescence (PL) emission is a valuable tool for investigating carrier localization, recombination, and carrier–phonon interactions. Herein, electron–phonon couplings in lead sulfide (PbS) quantum dots (QDs) and lead sulfide/manganese tellurite (PbS/MnTe) QDs is reported. The effect of temperature on the PL emission of PbS and PbS/MnTe was explored within a temperature range of 10 to 300 K. When temperature increased, PL emission was blue-shifted due to the confinement effect. The gradual broadening of the full width at half maximum (FWHM) with increasing temperature indicates electron–phonon interactions. An analysis based on the Boson model revealed that the values of the exciton acoustic phonon coupling coefficient, σ, and temperature-dependent linewidth, γ, for PbS/MnTe were larger than those for PbS, indicating stronger exciton longitudinal-optical–phonon coupling in the compound structure.

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37

Romanchek, Gregory, Yuli Wang, Harsha Marupudi, and Shiva Abbaszadeh. "Performance of Optical Coupling Materials in Scintillation Detectors Post Temperature Exposure." Sensors 20, no. 21 (October 27, 2020): 6092. http://dx.doi.org/10.3390/s20216092.

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In this paper, the room-temperature performance of different optical coupling materials post temperature exposure was tested. The tested couplers included OC431A-LVP, OG0010 optical grease, BLUESIL V-788, and SAINT-GOBAIN BC-630. This was done by subjecting the whole detector with newly applied optical coupling materials to a 2-h temperature exposure—ranging from −20 to 50 °C and then by letting it return to room temperature before collecting a spectrum from a Cs-137 source. The energy resolution at 662 keV was computed as the metric for evaluating the performance. Three trials were run at each coupler–temperature combination. Our results reveal that the performance of all coupling agents do indeed change with temperature after the 2-h exposure. Over all the tested temperature trials, the energy resolution ranged from 11.4 to 14.3% for OC431A-LVP; 10.2 to 14.6% for OG0010; 10 to 13.4% for BLUESIL V-788; and 9.8 to 13.3% for SAINT-GOBAIN BC-630. OC431A-LVP had the lowest variance over the full range, while BC-630 was the most constant for temperatures above 20 °C. Ultraviolet-visible (UV-Vis) spectra experiments were also performed on isolated optical coupling materials to measure the light absorption coefficient. The results show that the temperature-induced variance in light absorption coefficient of each optical coupling materials is one of the reasons for the variance in energy resolution performance. Our findings suggest the need for further investigation into this effect and the recommendation that optical coupling materials need to be selected for the task at hand with greater scrutiny.

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38

Starostin, NP, and RS Tikhonov. "Thermoelastic state during electrofusion welding of polyethylene pipes at different ambient temperatures." IOP Conference Series: Earth and Environmental Science 991, no. 1 (February 1, 2022): 012011. http://dx.doi.org/10.1088/1755-1315/991/1/012011.

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Abstract The problem of welding polyethylene pipes used in the mining industry at low ambient temperatures is considered The numerical solution of a thermoelastic problem revealed the distinctive features of thermal and stress-strain states of weld connections of polyethylene pipes using embedded heater couplings at different ambient temperatures. It is found that in low-temperature conditions, the size of the melted zone is considerably smaller than during welding at permissible temperatures. In this regard, the pressure insufficient for high-quality welding is created between the coupling and the pipe. It is also shown that at the time of melt crystallization, the maximum values of stresses and strains during welding at low temperatures are higher than during welding in the permissible temperature range, which causes high values of residual stresses. The results obtained can be used in the development of low temperature welding technology.

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39

Bussières, Normand, and Raoul J. Granger. "Estimation of Water Temperature of Large Lakes in Cold Climate Regions during the Period of Strong Coupling between Water and Air Temperature Fluctuations." Journal of Atmospheric and Oceanic Technology 24, no. 2 (February 1, 2007): 285–96. http://dx.doi.org/10.1175/jtech1973.1.

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Abstract Near-surface bulk water temperature measured in large northern lakes during the warm season with buoys can be characterized by three components: a slowly varying seasonal-/climate-related trend, fluctuations at the time scale of weather perturbations, and rapid daily fluctuations. When thermal infrared data are used to estimate surface water temperature, an additional term relating the differences between the skin and bulk temperatures is implied. Buoy data in this work serve to demonstrate the existence of a period of strong signal coupling between fluctuations of water temperature and air temperature. The period of strong signal coupling does not extend beyond the date of maximum temperature in the water temperature trend. During this period, a simple linear transformation of air temperature fluctuations can be used to simulate the buoy water temperature fluctuations. Attempts to simulate water temperature fluctuations from air temperature alone are not possible beyond this period. Water temperature simulation error depends on the distance of the air temperature measurement from the buoy, ranging from ±1.1°C at 0 km to ±1.4°C at 40 km. The method developed with buoy data is applied to the combination of satellite thermal infrared and operationally measured air temperature data to simulate water temperatures. Through the use of satellite data, the water temperature simulations are extended beyond the period of strong coupling.

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40

Zhang, Jia, Rui Qin, Wenjun Zhu, and Jan Vorberger. "Energy Relaxation and Electron–Phonon Coupling in Laser-Excited Metals." Materials 15, no. 5 (March 3, 2022): 1902. http://dx.doi.org/10.3390/ma15051902.

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The rate of energy transfer between electrons and phonons is investigated by a first-principles framework for electron temperatures up to Te = 50,000 K while considering the lattice at ground state. Two typical but differently complex metals are investigated: aluminum and copper. In order to reasonably take the electronic excitation effect into account, we adopt finite temperature density functional theory and linear response to determine the electron temperature-dependent Eliashberg function and electron density of states. Of the three branch-dependent electron–phonon coupling strengths, the longitudinal acoustic mode plays a dominant role in the electron–phonon coupling for aluminum for all temperatures considered here, but for copper it only dominates above an electron temperature of Te = 40,000 K. The second moment of the Eliashberg function and the electron phonon coupling constant at room temperature Te=315 K show good agreement with other results. For increasing electron temperatures, we show the limits of the T=0 approximation for the Eliashberg function. Our present work provides a rich perspective on the phonon dynamics and this will help to improve insight into the underlying mechanism of energy flow in ultra-fast laser–metal interaction.

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41

Guidry, Mike, Yang Sun, and Lian-Ao Wu. "The Superconducting Critical Temperature." Symmetry 13, no. 5 (May 20, 2021): 911. http://dx.doi.org/10.3390/sym13050911.

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Two principles govern the critical temperature for superconducting transitions: (1) intrinsic strength of the pair coupling and (2) the effect of the many-body environments on the efficiency of that coupling. Most discussions take into account only the former, but we argue that the properties of unconventional superconductors are governed more often by the latter, through dynamical symmetry relating to normal and superconducting states. Differentiating these effects is essential to charting a path to the highest-temperature superconductors.

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42

LENG, Q., J. A. WOLF, P. GRÜNBERG, and W. ZINN. "OSCILLATORY EXCHANGE COUPLING OF Fe LAYERS ACROSS Cr INTERLAYERS." International Journal of Modern Physics B 07, no. 01n03 (January 1993): 434–37. http://dx.doi.org/10.1142/s0217979293000913.

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The exchange coupling of Fe layers across Cr interlayers oscillates as a function of the Cr thickness with a short and a long period. The short period oscillations are only observed In samples with very good quality. In addtion to ferro- and antiferromagnetic type coupling there is also a contribution favoring a perpendicular magnetization alignment of neighbouring magnetic films. The temperature dependence of these couplings has been investigated .

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43

Wang, Zhen, Kai Xu, and Yufeng Du. "Temperature Rise Calculation of Magnetic Core Considering the Temperature Effect of Magnetic Properties in an Electrical Steel Sheet." Symmetry 14, no. 11 (November 4, 2022): 2315. http://dx.doi.org/10.3390/sym14112315.

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The magnetic properties of electrical steel sheets are affected by magnetization patterns, working temperature, and external pressure. In order to study the temperature effect of electrical steel sheets on the temperature rise of a transformer core, in this paper, based on the magnetic property test system of an electrical steel sheet, the permeability and loss of a 50AW600 grain non-oriented electrical steel sheet and a 30ZH120 grain oriented electrical steel sheet under different temperatures and excited frequencies were measured, and the influence of temperature on the properties of the material was analyzed. A magneto-thermal iterative coupling method considering the temperature effects of magnetic properties in the electrical steel sheet was investigated. Based on the above measurement data and iterative coupling method, the temperature distribution of the core of a 500-kV power transformer was simulated and analyzed, and compared with the simulation results of the traditional coupling method without considering the temperature effect of the electrical steel sheet. Magneto-thermal coupling simulation under no-load operation is a symmetrical problem. It was found that the temperature of the hottest spot of the transformer core calculated by the magneto-thermal iteration method proposed in this paper was significantly reduced, the temperature of the hottest spot on the core column was about 45 °C, and the temperature of the hottest spot on the upper and lower yoke was about 39 °C, which provides an effective simulation method for accurately calculating the temperature rise distribution of electrical products such as transformers.

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44

DANG, N. DINH, and N. QUANG HUNG. "NUCLEAR PAIRING AT FINITE TEMPERATURE AND ANGULAR MOMENTUM." International Journal of Modern Physics E 17, no. 10 (November 2008): 2160–64. http://dx.doi.org/10.1142/s0218301308011276.

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An approach is proposed to nuclear pairing at finite temperature and angular momentum, which includes the effects of the quasiparticle-number fluctuation and dynamic coupling to pair vibrations within the self-consistent quasiparticle random-phase approximation. The numerical calculations of pairing gaps, total energies, and heat capacities are carried out within a doubly folded multilevel model as well as several realistic nuclei. The results obtained show that, in the region of moderate and strong couplings, the sharp transition between the superconducting and normal phases is smoothed out, causing a thermal pairing gap, which does not collapse at a critical temperature predicted by the conventional Bardeen-Cooper-Schrieffer's (BCS) theory, but has a tail extended to high temperatures. The theory also predicts the appearance of a thermally assisted pairing in hot rotating nuclei.

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45

Lenz, Samuel, David Hunger, and Joris van Slageren. "Strong coupling between resonators and spin ensembles in the presence of exchange couplings." Chemical Communications 56, no. 84 (2020): 12837–40. http://dx.doi.org/10.1039/d0cc04841k.

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46

Czajka, Alina, Keshav Dasgupta, Charles Gale, Sangyong Jeon, Aalok Misra, Michael Richard, and Karunava Sil. "On bulk viscosity at weak and strong ’t Hooft couplings." Modern Physics Letters A 35, no. 27 (June 25, 2020): 2030012. http://dx.doi.org/10.1142/s0217732320300128.

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Bulk viscosity is an important transport coefficient that exists in the hydrodynamical limit only when the underlying theory is non-conformal. One example being thermal QCD with large number of colors. We study bulk viscosity in such a theory at low energies and at weak and strong ’t Hooft couplings when the temperature is above the deconfinement temperature. The weak coupling analysis is based on Boltzmann equation from kinetic theory whereas the strong coupling analysis uses non-conformal holographic techniques from string and M-theories. Using these, many properties associated with bulk viscosity may be explicitly derived.

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47

Jia, Meixia, Jianjun Hu, Feng Xiao, Ying Yang, and Chenghao Deng. "Modeling and Analysis of Electromagnetic Field and Temperature Field of Permanent-Magnet Synchronous Motor for Automobiles." Electronics 10, no. 17 (September 6, 2021): 2173. http://dx.doi.org/10.3390/electronics10172173.

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In order to study the interaction of electromagnetic fields and temperature fields in a motor, the iron loss curve at different frequencies of silicon steel and the B-H curve at different temperatures of the permanent magnet (PM) were obtained to establish the electromagnetic model of the permanent magnet synchronous motor (PMSM). Then, unidirectional and bidirectional coupling models were established and analyzed based on the multi-physical field. By establishing a bidirectional coupling model, the temperature field distribution and electromagnetic characteristics of the motor were analyzed. The interaction between temperature and electromagnetic field was studied. Finally, the temperature of the PMSM was tested. The results showed that the bidirectional coupling results were closer to the test result because of the consideration of the interaction between electromagnetic and thermal fields.

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48

RAMARAO, M. V. S., J. SANJAY, and R. KRISHNAN. "Modulation of summer monsoon sub-seasonal surface air temperature over India by soil moisture-temperature coupling." MAUSAM 67, no. 1 (December 8, 2021): 53–66. http://dx.doi.org/10.54302/mausam.v67i1.1142.

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The influence of soil moisture on the sub-seasonal warmer surface air temperature anomalies during drier soil conditions associated with break spells in the Indian summer monsoon precipitation is explored using observations. The multi-model analysis of land surface states and fluxes available from the Second Global Soil Wetness Project (GSWP-2) are found useful in understanding the mechanism for this soil moisture-temperature coupling on sub-seasonal timescales. The analysis uses a soil moisture-temperature coupling diagnostic computed based on linear correlations of daily fields. It is shown that the summer surface air temperature variations are linked to intraseasonal variations of the Indian monsoon precipitation, which control the land-climate coupling by modulating the soil moisture variations. Strong coupling mainly occurs during dry soil states within the summer monsoon season over the transition zones between wet and dry climates of central to north-west India. In contrast, the coupling is weak for constantly wet and energy-limited evaporative regimes over eastern India during the entire summer monsoon season. This observational based analysis provided a better understanding of the linkages between the sub-seasonal dry soil states and warm conditions during the Indian summer monsoon season. A proper representation of these aspects of land-atmosphere interactions in weather and climate models used for sub-seasonal and seasonal monsoon forecasting could be critical for several applications, in particular agriculture. The soil moisture-temperature coupling diagnostic used in this study will be a useful metric for evaluating the performance of weather and climate models.

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49

Reuvekamp, L. A. E. M., J. W. ten Brinke, P. J. van Swaaij, and J. W. M. Noordermeer. "Effects of Time and Temperature on the Reaction of Tespt Silane Coupling Agent During Mixing with Silica Filler and Tire Rubber." Rubber Chemistry and Technology 75, no. 2 (May 1, 2002): 187–98. http://dx.doi.org/10.5254/1.3544972.

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Abstract The addition of a coupling agent to silica-rubber compounds enhances the filler-matrix compatibility. Under certain mixing conditions the surface of the filler may be only partly activated, which may have an adverse effect on the properties in the final product. Some coupling agents may also act as sulfur donor. The dump temperature employed during mixing and the length of time the compound is exposed to that temperature govern the reaction mechanisms of the coupling agent and determine whether the agent leads to the formation of a silica-rubber bond or acts as a curing agent. A temperature of at least 130 °C is necessary to ensure that the reaction between the coupling agent and the silica proceeds, whereas the coupling agent starts to react with the rubber or to donate sulfur, resulting in scorching, at temperatures above 160 °C. An increase in the 300% modulus and/or G' at 100% strain above 150 °C is an indication of scorching caused by the sulfur in the coupling agent. No scorching is observed when a coupling agent without sulfur is used. Another important parameter is the mixing time. It was observed that the coupling agent must be mixed with the silica for at least 10 minutes at 150 °C to obtain a sufficient degree of coupling.

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50

Jia, Jiu Hong, Ze Hou Wang, Dai Feng Yao, and Shan-Tung Tu. "Brazing Coupling Performance of Piezoelectric Waveguide Transducers for the Monitoring of High Temperature Components." Sensors 21, no. 1 (December 25, 2020): 94. http://dx.doi.org/10.3390/s21010094.

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Piezoelectric waveguide transducers possess great potential for the online monitoring of high temperature critical components, in order to improve their operational safety. Due to the use of a waveguide bar, the sensory device is not susceptible to high temperature environments, which enables the long-term service of the piezoelectric transducers. However, the coupling between the waveguide bar and the high-temperature component has been proven to be the most important part of the monitoring system. In order to effectively transmit waves through the junction of the waveguide bar and the monitoring target, it is necessary to research a reliable coupling method to connect the waveguide transducers with the host structure. In the present research, the feasibility of brazing coupling for wave propagation through the junction was investigated through experiments. Piezoelectric waveguide transducers were welded using various kinds of brazing filler metals. The experimental results indicate that the coupling effects of the brazing welding depend on the filler metals. At the same time, some filler metals for the effective coupling of the transducer and the target monitoring component were identified. The brazing coupling method was verified that it can non-dispersively and effectively propagate waves into the host structure with much better reliability than the conventional dry coupling approach. Moreover, the high-temperature experimental results show that the brazing-coupled waveguide bar system can work reliably and stably in high temperatures at 300 °C for a long time. This work strives to pave a solid foundation for the application of piezoelectric waveguide transducers for the structural health monitoring of high temperature critical components.

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