Academic literature on the topic 'Equivalent temperature gradient'

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Journal articles on the topic "Equivalent temperature gradient"

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Li, Zhaoyi, Wei Liang, and Yufeng Liu. "Equivalent Modulus and Mass Loss of C/C-SiC Gradient Matrix Composites at High Temperature." Journal of Physics: Conference Series 2219, no. 1 (2022): 012010. http://dx.doi.org/10.1088/1742-6596/2219/1/012010.

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Abstract The oxidation at high temperature of carbon fiber reinforced carbon-silicon carbide (C/C-SiC) gradient matrix composites results in structural damages and performance degradation. Oxidation kinetics model of C/C-SiC gradient matrix composites was built. A representative volume element (RVE) was established according to the microstructure of the composites. The evolution law of the structure characterization of the composites and the mass loss model were derived from the oxidation kinetics model. And equivalent elastic modulus with oxidation time at different temperatures and coefficie
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Baumann, Hannes, and David O. Conover. "Adaptation to climate change: contrasting patterns of thermal-reaction-norm evolution in Pacific versus Atlantic silversides." Proceedings of the Royal Society B: Biological Sciences 278, no. 1716 (2011): 2265–73. http://dx.doi.org/10.1098/rspb.2010.2479.

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How organisms may adapt to rising global temperatures is uncertain, but concepts can emerge from studying adaptive physiological trait variations across existing spatial climate gradients. Many ectotherms, particularly fish, have evolved increasing genetic growth capacities with latitude (i.e. countergradient variation (CnGV) in growth), which are thought to be an adaptation primarily to strong gradients in seasonality. In contrast, evolutionary responses to gradients in mean temperature are often assumed to involve an alternative mode, ‘thermal adaptation’. We measured thermal growth reaction
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Thomas, Carl M., and David M. Schultz. "What are the Best Thermodynamic Quantity and Function to Define a Front in Gridded Model Output?" Bulletin of the American Meteorological Society 100, no. 5 (2019): 873–95. http://dx.doi.org/10.1175/bams-d-18-0137.1.

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AbstractFronts can be computed from gridded datasets such as numerical model output and reanalyses, resulting in automated surface frontal charts and climatologies. Defining automated fronts requires quantities (e.g., potential temperature, equivalent potential temperature, wind shifts) and kinematic functions (e.g., gradient, thermal front parameter, and frontogenesis). Which are the most appropriate to use in different applications remains an open question. This question is investigated using two quantities (potential temperature and equivalent potential temperature) and three functions (mag
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Huang, Zi Qian, and Qing Lian Xie. "Study on Thermal Stresses of Cylinder Liner’s Fabrication Using FEM Analysis." Advanced Materials Research 189-193 (February 2011): 2058–61. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2058.

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In the process of casing casting, great temperature gradient leads to contraction deformation of cylinder liner, which influences the quality of products. The thermal stresses caused by temperature gradient were analyzed by finite element method. The numerical results show that high equivalent Von Mises stress(242MPa) occurs in the surface zone of the cylinder liner as Cooling down to room temperature within pipe die ,also there is plastic deformation in the internal and external surface zone. Reducing the cooling speed, decreasing the temperature gradient and aging can reduce the influence of
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Li, Boyu, Fei Lei, and Zibo Shen. "A Comprehensive Simplified Algorithm for Heat Transfer Modeling of Medium-Deep Borehole Heat Exchangers Considering Soil Stratification and Geothermal Gradient." Energies 18, no. 14 (2025): 3716. https://doi.org/10.3390/en18143716.

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Medium-deep borehole heat exchanger (BHE) systems represent an emerging form of ground source heat pump technology. Their heat transfer process is significantly influenced by geothermal gradient and soil stratification, typically simulated using segmented finite line source (SFLS) models. However, this approach involves computationally intensive procedures that hinder practical engineering implementation. Building upon an SFLS model adapted for complex geological conditions, this study proposes a comprehensive simplified algorithm: (1) For soil stratification: A geothermally-weighted thermal c
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Mohamed, Ashraf R., and Will Hansen. "Effect of Nonlinear Temperature Gradient on Curling Stress in Concrete Pavements." Transportation Research Record: Journal of the Transportation Research Board 1568, no. 1 (1997): 65–71. http://dx.doi.org/10.3141/1568-08.

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Temperature and moisture gradients can lead to significant tensile stresses at the slab top and bottom. Current techniques for assessing the internal stresses due to such gradients are based on the assumption that temperature and moisture distributions through the slab thickness are linear. However, the actual distributions of such gradients have been found to be highly nonlinear. A new closed form solution technique for calculating the stresses in a pavement slab due to nonlinear gradients is introduced. The analysis is separated into two parts. In the first, an expression is presented for ca
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Suresha, Kasala. "Amplification and Attenuation of Acoustic Phonons in Graphenelike Silicene." International Journal for Research in Applied Science and Engineering Technology 9, no. 12 (2021): 1594–97. http://dx.doi.org/10.22214/ijraset.2021.39562.

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Abstract: Because of unique physical properties, graphene, a 2D honeycomb arrangement of carbon atoms, has attracted tremendous attention. Silicene, the graphene equivalent for silicon, could follow this trend, opening new perspectives for applications, especially due to its compatibility with Si-based electronics. Silicene has been theoretically predicted as a buckled honeycomb arrangement of Si atoms and having an electronic dispersion resembling that of relativistic Dirac fermions. We calculate theoretically in this article, the amplification and attenuation of acoustic phonons due to an ex
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Billon, Noelle, Jean Marc Haudin, Camille Vallot, and Charles Babin. "Stretch Blow Moulding of Mineral Filled PET." Key Engineering Materials 504-506 (February 2012): 1099–104. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.1099.

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Injection Stretch Blow mouldng is a two step processing that was designed and optimized mainly using unfilled PET resins. This study focuses on stretch blow moulding of a PET filled with a few percent of sub micronic mineral fillers. Based on DSC, DMA, tensile tests as well as blowing on prototype machine main effects of fillers are analysed. It is demonstrated that fillers increases crystallization kinetics resulting in a reduction of the processing range. Difference in strain hardening induced by fillers makes it necessary to adjust blowing temperature. However main effect occurs during heat
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Miaskowski, Arkadiusz, and Piotr Gas. "Numerical Estimation of SAR and Temperature Distributions inside Differently Shaped Female Breast Tumors during Radio-Frequency Ablation." Materials 16, no. 1 (2022): 223. http://dx.doi.org/10.3390/ma16010223.

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Radio-frequency (RF) ablation is a reliable technique for the treatment of deep-seated malignant tumors, including breast carcinoma, using high ablative temperatures. The paper aims at a comparative analysis of the specific absorption rate and temperature distribution during RF ablation with regard to different female breast tumors. In the study, four tumor models equivalent to an irregular tumor were considered, i.e., an equivalent sphere and ellipsoid with the same surfaces and volumes as the irregular tumor and an equivalent sphere and ellipsoid inscribed in the irregular tumor. An RF appli
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Riley, Jeffrey B., Scott B. Hardin, Brad A. Winn, and Michael B. Hurdle. "In vitro comparison of cavoatrial (dual stage) cannulae for use during cardiopulmonary bypass." Perfusion 1, no. 3 (1986): 197–204. http://dx.doi.org/10.1177/026765918600100308.

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An in vitro normothermic, human blood test circuit was constructed to test four cavoatrial (dual stage) cannulae, their right atrial baskets and IVC tips for venous return flow versus siphon drainage gradient. Simulated patient CVP and ECC oxygenator/venous reservoir inlet resistance were held constant at 10 mmHg and 15 mmHg respectively as siphon gradient was varied from 0 centimetres (cm) to -40 cm of blood. At the same siphon gradients between -10 and -40 cm, the Research Medical, Inc. (RMI) VV 3651 L, its right atrial (RA) basket, and IVC tip yielded significantly greater flows than the Sa
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Dissertations / Theses on the topic "Equivalent temperature gradient"

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Kovaľová, Alžbeta. "Kvantifikace turbulence pomocí ekvivalentního teplotního gradientu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442412.

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The diploma thesis is focused on the optical beam propagating in the atmosphere in a wireless communication optical link. The first part of the work explains the atmospheric transmission media with turbulence and its effects on reliability of the optical system. The second part introduces methods for turbulence determination based on a statistical approach to turbulence quantification are introduced. In the third part, method of equivalent temperature gradient is described with the advantage of immediate turbulence evaluation. The output of this thesis is the model of turbulent environment for
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Books on the topic "Equivalent temperature gradient"

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Zeitlin, Vladimir. Rotating Shallow-Water model with Horizontal Density and/or Temperature Gradients. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198804338.003.0014.

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The derivation of rotating shallow-water equations by vertical averaging and columnar motion hypothesis is repeated without supposing horizontal homogeneity of density/potential temperature. The so-called thermal rotating shallow-water model arises as the result. The model turns to be equivalent to gas dynamics with a specific equation of state. It is shown that it possesses Hamiltonian structure and can be derived from a variational principle. Its solution at low Rossby numbers should obey the thermo-geostrophic equilibrium, replacing the standard geostrophic equilibrium. The wave spectrum of
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Book chapters on the topic "Equivalent temperature gradient"

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Fedkin, Valentin V., Theodore D. Burlick, Mary L. Leech, Andrey A. Shchipansky, Peter M. Valizer, and W. G. Ernst. "Petrotectonic origin of mafic eclogites from the Maksyutov subduction complex, south Ural Mountains, Russia." In Plate Tectonics, Ophiolites, and Societal Significance of Geology: A Celebration of the Career of Eldridge Moores. Geological Society of America, 2021. http://dx.doi.org/10.1130/2021.2552(09).

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ABSTRACT The Maksyutov complex is a mid- to late-Paleozoic high- to ultrahigh-pressure (HP-UHP) eclogite-bearing subduction zone terrane in the south Ural Mountains. Previous reports of radial fractures emanating from quartz inclusions in garnet, omphacite, and glaucophane, cuboid graphite pseudomorphs after matrix diamond, and microdiamond aggregates preserved in garnet identified by Raman spectroscopy indicate that parts of the complex were subjected to physical conditions of ∼600 °C and >2.8 GPa for coesite-bearing rocks, and >3.2 GPa for diamond-bearing rocks. Peak UHP eclogi
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Conference papers on the topic "Equivalent temperature gradient"

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Chen, Qingyou. "Effect of temperature gradient on equivalent background input of image intensifier." In SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, edited by Walter A. Flood and Walter B. Miller. SPIE, 1994. http://dx.doi.org/10.1117/12.177954.

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Bae, Sungjin. "Calculation of Curvature Using Linear Thermal Gradient." In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54912.

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Reinforced concrete structures for nuclear power plants are designed for thermal effects. When a structure is subject to transient temperature rise, the temperature distribution in a member becomes nonlinear. Commentary of ACI 349 code provides a method of converting a nonlinear temperature distribution to an equivalent linear temperature distribution in order to facilitate calculating curvature due to temperature change. However, the accuracy of estimated thermal curvatures for concrete sections with a liner plate needs to be examined because the ACI 349 method is based on a pure concrete sec
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Hudcova, Lucie, and Otakar Wilfert. "Possibilities of Using the Modified Equivalent Temperature Gradient for a Turbulent Atmosphere." In 2019 Conference on Microwave Techniques (COMITE). IEEE, 2019. http://dx.doi.org/10.1109/comite.2019.8733453.

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Hudcova, Lucie, and Otakar Wilfert. "Quantification of the atmospheric turbulence by the method of the equivalent temperature gradient." In 2018 28th International Conference Radioelektronika (RADIOELEKTRONIKA). IEEE, 2018. http://dx.doi.org/10.1109/radioelek.2018.8376401.

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Laval, Philippe, Jean-Baptiste Salmon, Galder Cristobal, and Mathieu Joanicot. "Investigating Kinetics of Temperature-Dependent Processes Using Microfluidics." In ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2006. http://dx.doi.org/10.1115/icnmm2006-96056.

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We have developed an original microfluidic system to study fast kinetics of temperature-dependent processes in an emulsion. Using flow focusing geometries, aqueous droplets are continuously formed in an oil flow. These droplets, acting as microreactors (100 nL), contain the solution to be investigated, and are formed at high temperature. They flow in a microchannel to a cooled area through a controlled temperature gradient (typically from 60 to 10°C in a few seconds). Along the microchannel, the distance being equivalent to the time thanks to the use of droplets, the kinetics of the process ca
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Chen, Cao, and Xiaojun Yan. "Creep/Fatigue Tests on Full Scale Hollow Turbine Blades Considering Temperature Gradient." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56807.

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Working in a harsh environment with high temperature gas and high rotation speed, hollow turbine blades of gas turbine engine commonly endure both creep damage and low cycle fatigue damage at the same time. It is difficult to predict the life of hollow turbine blades accurately because of a strong coupling effect between creep and low cycle fatigue (creep/fatigue) damage. To address this difficulty, one effective way is to carry out creep/fatigue tests on full scale hollow turbine blades in a bench environment. The present creep/fatigue test methods on full scale hollow turbine blades usually
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Josserand, E., and F. Billon. "Application of Mixed Equivalent Solid and Explicit Hole Models to Analysis of Thick Perforated Plates." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61885.

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Confronted with the problem of how to conduct a complete fatigue analysis of the Tube Plate (TP) of Tubular and Shell Heat Exchangers and particularly of the Steam Generators equipping nuclear power plants of the Pressurized Water Reactor type (PWR), analysts have developed a method to analyse stress in perforated flat and thick Tube Plates with square penetration (crate) patterns, and in particular to analyse several specific zones such as the Interface Zones and various Effects, such as the Secondary (or Shell) Thermal Gradient Effect (STG Effect), the Thermal Gradient in the No-Tube Lane Ef
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Cheng, B., G. J. Yang, Q. Zhang, et al. "Thermal Gradient Cyclic Lifetime of La2Zr2O7/YSZ Double Ceramic Layer Thermal Barrier Coatings with Equivalent Thermal Insulation Performance." In ITSC2017, edited by A. Agarwal, G. Bolelli, A. Concustell, et al. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0843.

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Abstract Thermal insulation performance is a measurement of the thermal protection offered by the thermal barrier coatings (TBCs) to the substrate, therefore, it is essentially important to compare different double ceramic layer (DCL) TBCs on the premise of the same thermal resistance. In this study, a series of LZO/YSZ DCL-TBCs, with the equivalent thermal insulation to 500 µm thick YSZ TBCs, were prepared, and their lifetimes were evaluated by thermal gradient cyclic test at the top coat surface temperature of 1300°C. Result show that, the lifetime of DCL-TBCs was more than doubled compared
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Zherelyev, Alexandr, and Jon Bjorn Molster. "Influence of Temperature Profile Modelling on the Accuracy of Hydraulic Parameters Estimation Effect of Temperature Profile Change Due to Continuous Drillstring Rotation." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22030-ea.

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Abstract ERD wells are widely used by operators in the MENA region to maximize reservoir contact, lower cost per barrel accessed, and to be able to access far away drill targets from fewer drill centers (wellhead platforms, islands, drill pads). ERD wells and associated required technological well construction approaches by nature are typically non-standard. ERD well construction require very exact and detailed engineering analysis and methodologies to be applied in order to develop suitable and accurate drilling designs that closely matches to the actual conditions. During drilling of ERD wel
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Uplinger, W. G. "Relative optical mass in a nonisothermal atmosphere." In OSA Annual Meeting. Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.ww4.

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A closed-form expression is theoretically derived for the relative optical air mass as a function of zenith angle in an atmosphere with a temperature gradient. The effects of refraction are included, and the atmosphere is assumed to be in hydrostatic equilibrium. Due to the temperature gradient, the atmospheric density does not fall off exponentially with altitude but according to a power law. The radius of the earth is a factor in the expression; thus the relative air mass on other planets can also be calculated. The relative air mass is 1.0 for a vertical path and is around 40.0 for a horizo
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