Готові списки джерел за темами / Thermal field model

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Добірка наукової літератури з теми "Thermal field model"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Thermal field model"

Dmitriev, A. N., and Yu V. Pakharukov. "Thermoelectric model of the Earth's magnetic field." Oil and Gas Studies, no. 2 (June 11, 2021): 39–52. http://dx.doi.org/10.31660/0445-0108-2021-2-39-52.

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A variant of the thermoelectric model of the Earth's dipole magnetic field is considered. It is based on geothermoelectric currents present in the planet's core. The currents cyclically change their direction, which leads over time either to warming on the Earth, if their movement is directed towards the Earth's crust, or to cooling, when moving towards the inner core. With each change in the direction of movement of the thermal currents, the poles of the Earth's magnetic field are inverted simultaneously. The inversion process is instantaneous (on the scale of planetary time) and is not the result of a gradual reversal on the 180° Earth's magnetic axis. At the moment of inversions of thermal currents in the core, the total geomagnetic field decreases to the level of 4.6∙10-6 T, which is constantly supported by thermal currents of semi-conducting rocks of the lower mantle. The considered version of the thermoelectric model of the Earth's magnetic field may be promising for studying the magnetic fields of planets in the Solar system.

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Liu, Hong, Jin Guo Li, and Yong Tian Wang. "Fast Computing Model for Thermal Field of Auto Lamp." Key Engineering Materials 364-366 (December 2007): 783–88. http://dx.doi.org/10.4028/www.scientific.net/kem.364-366.783.

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Thermal field analysis for automotive lamps is a complicated thermodynamics problem. According to the features of structure and lighting process of automotive lamps, a simple and convenient model is put forward here for analyzing their thermal field. Under certain assumptions, it simplifies the complicated geometrical structure to the relative simple cavities and only considers the influence of thermal conduction and thermal radiation as main forms of heat transfer for thermal field of the lamps. The consistency of numerical analysis and actual test demonstrates that this modeling method calculates thermal field of the lamps quickly and perfectly, and indicates its practical signification.

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Rajendran, S., C. C. Chao, D. P. Hill, J. P. Kalejs, and Vern Overbye. "Magnetic and thermal field model of EFG system." Journal of Crystal Growth 109, no. 1-4 (February 1991): 82–87. http://dx.doi.org/10.1016/0022-0248(91)90160-7.

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Drahoš, Peter, Vladimír Kutiš, and Róbert Lenický. "Thermocouple Sensor Influence on Temperature Field in SMA Actuator." Applied Mechanics and Materials 394 (September 2013): 50–56. http://dx.doi.org/10.4028/www.scientific.net/amm.394.50.

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The paper deals with thermal analysis, modeling and simulation of the Shape Memory Alloy (SMA) actuator with temperature sensor. Because the capabilities of analytical description of SMA system are limited, numerical simulations of model have to be performed. Two different numerical models are investigated - lumped and continuous model. Simple parametric lumped model of actuator thermal field is developed in order to describe thermal field at the measuring point. The characteristic parameters of the lumped model are set up according to continuous coupled electric-thermal model made in ANSYS FEM program.

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Wang, Jingxia, Yusheng Hu, Ming Cheng, Biao Li, and Bin Chen. "Bidirectional Coupling Model of Electromagnetic Field and Thermal Field Applied to the Thermal Analysis of the FSPM Machine." Energies 13, no. 12 (June 14, 2020): 3079. http://dx.doi.org/10.3390/en13123079.

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The paper aimed to find an accurate and fast model to study the electromagnetic (EM) thermal (TH) filed coupling calculation for the TH analysis in the flux switching permanent magnet (FSPM) machine. It is extremely important to know the coupling mechanism between the EM field and TH field for the designers and users of the FSPM machines. Firstly, in order to study the EM properties of the silicon steel sheet with the temperature, the Epstein frame experiment was set up, where the effect of dc magnetic bias on the core loss is also considered. In order to save the computation time, the bidirectional coupling model based on 2D finite element (FE) EM field and 3D asymmetric minimum element TH field is established, and the steady state and transient TH fields are calculated, respectively. For the transient bidirectional coupling of EM field and TH field, a method based on the adaptive adjustment calculation step is adopted to improve the computing speed. The temperature rise experiment of the prototype was carried out to verify the accuracy of the proposed coupling model. The experimental results are in good agreement with the simulation results.

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Suh, S. W. "A Hybrid Near-Field/Far-Field Thermal Discharge Model for Coastal Areas." Marine Pollution Bulletin 43, no. 7-12 (July 2001): 225–33. http://dx.doi.org/10.1016/s0025-326x(01)00074-1.

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Karma, Alain, and Wouter-Jan Rappel. "Phase-field model of dendritic sidebranching with thermal noise." Physical Review E 60, no. 4 (October 1, 1999): 3614–25. http://dx.doi.org/10.1103/physreve.60.3614.

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Zubert, Mariusz, Tomasz Raszkowski, Agnieszka Samson, Marcin Janicki, and Andrzej Napieralski. "The distributed thermal model of fin field effect transistor." Microelectronics Reliability 67 (December 2016): 9–14. http://dx.doi.org/10.1016/j.microrel.2016.09.021.

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Sinelnikov, D., D. Bulgadaryan, V. Kurnaev, and M. Lobov. "The model of thermal field emission from tungsten fuzz." Journal of Physics: Conference Series 941 (December 2017): 012024. http://dx.doi.org/10.1088/1742-6596/941/1/012024.

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Jensen, Kevin L., Patrick G. O’Shea, and Donald W. Feldman. "Generalized electron emission model for field, thermal, and photoemission." Applied Physics Letters 81, no. 20 (November 11, 2002): 3867–69. http://dx.doi.org/10.1063/1.1521491.

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Дисертації з теми "Thermal field model"

Bawana, Niyem Mawenbe. "Thermal Response in a Field Oriented Controlled Three-phase Induction Motor." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7740.

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The research conducted at the department of Electrical Engineering of the University of South Florida campus in Tampa only covers the electrical aspect of electric drives. However, the performance of electric machinery is significantly impacted by temperature variation. The literature review shows three main control techniques in use today in electric drives namely, Scalar control, Direct Torque control and Field Oriented control. This thesis presents a temperature rise of rotor bars, stator winding, stator core and stator frame in a running three phase field-oriented controlled induction machine. A literature search shows that none of research has been carried out to investigate a thermal response of a field-oriented controlled induction motor. With this motivation, we were able to implement a lumped parameters thermal model of a three-phase field-oriented IM in MATLAB Simulink, which allows us to determine that rotor bars have the highest temperatures rising to 84 degrees Celsius. This confirms that rotors bars are the hottest part of a running IM as stipulated in literature.

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Huang, Zhida. "SIMULATION OF METAL GRAIN GROWTH IN LASER POWDER BED FUSION PROCESS USING PHASE FIELD THERMAL COUPLED MODEL." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1554391043588225.

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MacGinitie, Laura A. "Electrical and thermal modulation of protein synthesis in cartilage : a model for field effects on biological tissues." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/17222.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.
Title as it appears in M.I.T. Graduate List, Feb. 1988: Electrical and thermal modulation of protein synthesis in cartilage--a model for electric field effects on biological tissues.
Bibliography: leaves 264-281.
by Laura A. MacGinitie.
Ph.D.

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Spiegel, Colleen. "Mathematical modeling of polymer exchange membrane fuel cells." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002730.

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Seaman, Shane Thomas. "Material Related Effects on the Structural Thermal Optical Performance of a Thermally Tunable Narrowband Interferometric Spectral Filter." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/90799.

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High Spectral Resolution Lidar (HSRL) is a backscatter lidar technique that employs an optical/spectral filter to distinguish between particulate (Mie) and molecular (Rayleigh) backscattered light. By separating the two types of returns, higher accuracy measurements are possible that will enable improved climate models, air quality measurements, and climate forecasting. A spaceborne HSRL instrument can provide great impact in these areas by enabling near-continuous measurements across the Earth, however the optical filter technology has typically been too complex for reliable long-duration space flight due to the need for complicated and costly electro-optic feedback loops, extra alignment detectors, and additional laser sources. Furthermore, these complexities limit the filter from use in other applications. In this research, a high-performance, ultra-narrowband interferometric optical filter with a specific thermo-optical behavior has been designed and built. The interferometer has been designed such that it can be reliably adjusted/tuned by simply monitoring and adjusting the temperature. The greatly reduced operational complexity was made possible through high-accuracy thermal characterization of the interferometer materials, combined with detailed Structural-Thermal-Optical-Performance (STOP) modeling to capture the complicated interactions between the materials. The overall design process, fabrication procedures, and characterization of the optical filter are presented.
Doctor of Philosophy
LiDAR (an acronym for Light Detection and Ranging) is a technology that can be used to measure properties of the atmosphere. It is similar to radar, but uses much smaller light waves rather than larger radio waves, enabling more detailed information to be obtained. High Spectral Resolution Lidar (HSRL) is a lidar technique that uses a high precision optical filter to distinguish between light that scatters from particulates (such as dust, smoke, or fog) and light that scatters from molecules (such as oxygen, nitrogen, or carbon dioxide) in the atmosphere. By separating the two types of backscattered light, higher accuracy measurements are possible that will enable improvements in climate models, air quality measurements, and climate forecasting. A spaceborne HSRL instrument can provide great impact in these areas by enabling near-continuous measurements across the Earth; however, the optical filter technology has typically been too complex for reliable long-duration spaceflight due to the need for complicated and expensive additional hardware. In this research, a high-performance HSRL optical filter that can be reliably operated by simply monitoring and adjusting the temperature has been designed, built, and tested. The greatly-reduced operational complexity has been made possible through a new process that enables more accurate prediction of the complicated interactions between the materials of the optical filter. This process is based on a combination of high-accuracy characterization of the materials and detailed structural-thermal-optical-performance (STOP) modeling. The overall design process, fabrication procedures, and characterization of the optical filter are presented.

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上原, 拓也, Takuya UEHARA, 貴洋辻野 та Takahiro TSUJINO. "フェーズフィールドモデルを用いた変態‐熱‐応力連成解析の定式化". 日本機械学会, 2006. http://hdl.handle.net/2237/9012.

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Hasan, Md Mahmudul. "Thermal comfort conditions and perception by staff and patients in a Swedish health care center : A measurement and survey field study for summer conditions." Thesis, Högskolan i Gävle, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-34161.

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A challenging aspect of modern global development is to provide desired thermal environment for building occupants with optimum consideration of energy and occupants health and satisfaction, both physically and psychologically. The variation of activity level, health condition, needs, clothing habit and staying time of different categories of occupants in hospitals makes it critical where comfort level should be optimized. Now-a-days, tremendous changing on climate makes even more challenging to maintain optimum level of indoor thermal environment at low energy cost. Thermal comfort can be assessed by the well-established PMV- PPD model, and studies on the correlation with AMV ratings from the occupants can help to understand the exact scenario of the thermal comfort. Therefore, this research aims to estimate the thermal comfort level of healthcare occupants, compare PMV-PPD values with AMV for different categories of occupants, and analyze optimum operative temperature for energy savings. A combination of objective measurements and a field study with a semi-structured interview on comfort perception, following ISO-7726, 7730, 8996, 9920, 10551 and ASHARE- 55 regulations, were conducted, where a total number of 56 occupants, including 35 patients, 5 visitors and 16 medical staffs were participated from a health care center of a hospital in Stockholm, Sweden. The data was collected during the summertime. Based on studied thermal environment, both PMV (-1.59 to 1.01) and AMV range (-2 to 1) considering gender, indicated health care center of studied hospital toward slightly cold, where occupants wanted warmer indoor environment. Patients more than 60 years were most sensitive on thermal comfort and overall patients were more sensitive for warm indoor climate than medical staff due to health condition and age. But male respondents were less sensitive than female. PMV and AMV with optimum operative temperature provides the clear idea about optimum thermal environment for the hospitals occupant. Identifying an optimum thermal environment could be a sustainable solution if and only if energy can be reduced.

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Bagnoli, Annalisa. "Diffuse interface models for tumour growth within a non-isothermal Cahn-Hilliard theory for phase separation: thermodynamics, chemotaxis and stability." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14120/.

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In this thesis we provide a scheme for phase separation by accounting for diffusion, dynamic equations and consistency with thermodynamics. The constituents are two compressible fluids and, for the non-simple character of the mixture, an extra energy flux is allowed to occur. Since also thermal effects are included, the result is a whole set of evolution equations for the concentration, the velocity and the temperature which describes a non-isothermal Navier-Stokes-Cahn-Hilliard model for phase separation in a binary mixture with extra fluxes and within the Fourier heat theory. Alternative heat theories may be proposed for this Navier-Stokes-Cahn-Hilliard theory. Meanwhile the mixing problem is described graphically. Moreover the model may be generalized including a source term, and this doesn't affect the thermodynamic scheme. Then we describe and then compare two mathematical models for chemotactic processes: the pioneeristic Keller-Segel model and the hydrodynamic model by Chavanis and Sire. The first one is able to describe clusters or peaks, the second one involves inertial effects together with a friction force and leads to network patterns or filaments that are in good agreement with the experimental results. We analyze the linear stability of an infinite, stationary and homogeneous distribution of cells for determining the critical thresholds above which chemotactic collapse is allowed and cellular aggregation is reproduced. Then we discuss the differences between the two models, moreover we show the analogy between the instability criterion for biological populations and the Jeans instability criterion in an astrophysical setting. Finally we propose a different approach for the derivation of new diffuse interface models for tumour growth (with chemotaxis and active transport) based on the Cahn-Hilliard theory, combined with the (stationary) Darcy momentum equation.

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Castellví, Fernández Quim. "Non-focal non-thermal electrical methods for cancer treatment." Doctoral thesis, Universitat Pompeu Fabra, 2017. http://hdl.handle.net/10803/586217.

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Most physical ablation modalities for cancer treatment are focal and are based on thermal damage. Despite their regular clinical use as an alternative to surgical resection, their thermal principle of operation entails risks regarding the preservation of neighboring vital structures, such as large vessels, critical ducts or nerves. In addition, being focal, their use is unpractical in cases where multiple nodules are present or tumors are difficult to reach with the applicators. This thesis explores non-thermal electrical treatments which can be applied in a non-focal manner. Two treatments have been investigated: the first treatment, proposed by others a few years ago, is based on the permanent application of low magnitude alternating electric fields through surface electrodes. Here, this treatment has been in vivo studied to evaluate its efficacy as well as to discern whether it is non-thermally mediated. The second electrical treatment is based on the electroporation phenomenon and targets liver tumor nodules. Electroporation-based therapies employ brief high magnitude electric fields. These pulsed fields, alone or in combination with chemotherapeutic drugs, are able to kill cells by increasing their membrane permeability. Current electroporation-based therapies for internal tumors are local and are delivered through needle-shaped electrodes. Rather than using needle electrodes to treat liver tumors, here it is explored a novel treatment in which large plate electrodes are used to deliver the field across the whole liver in a non local fashion. The treatment aims at simultaneously destroying all tumors while preserving healthy tissue. Its efficacy is based on selectively enhancing the electric field over the tumors by infusing a solution with high electrical conductivity. The proposed treatment for liver tumors requires a high performance generator which is not currently available. The work presented here includes the design of a new generator topology able to fulfill the requirements.
La majoria del mètodes físics d'ablació tumoral es basen en produir dany tèrmic de manera focalitzada. Tot i ser considerats una alternativa habitual a la resecció quirúrgica, el principi tèrmic de funcionament, comporta un risc per la preservació d'estructures vitals adjacents a la zona de tractament, tals com grans vasos o nervis. A més, el fet de ser focals, fa impracticable la seva aplicació en cas de múltiples nòduls o tumors de difícil accés. Aquesta tesi explora tractaments elèctrics no basats en temperatura, capaços de ser aplicats de manera no focal. S'han investigat dos tractaments: El primer, proposat per altres fa pocs anys, està basat en aplicar permanentment camps elèctrics alterns de baixa magnitud a través d'elèctrodes superficials. Aquí, aquest tractament s'ha estudiat in vivo tant per avaluar la seva eficàcia com per discernir si aquesta resideix en la temperatura. El segon tractament es basa en el fenomen d'electroporació i persegueix el tractament de nòduls hepàtics. En els tractaments basats en electroporació, s’apliquen breus camps elèctrics de gran magnitud per tal de permeabilitzar la membrana cel·lular. Això permet la penetració d’agents quimioterapèutics o produeix directament la mort cel·lular. En lloc d'utilitzar, com és habitual, agulles per tal d'aplicar el tractament, aquí s'explora tractar tot el fetge de forma no localitzada, fent servir grans elèctrodes plans i paral·lels. Utilitzant solucions d'alta conductivitat elèctrica, es pretén magnificar selectivament el camp elèctric sobre els tumors, sent així capaços de destruir tots els tumors i alhora preservar el teixit sà. El tractament proposat per els tumors hepàtics, requereix d'un equip generador actualment no disponible. El presentat treball inclou el disseny d'una nova topologia de generadors capaç de complir amb els requisits.

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上原, 拓也, Takuya UEHARA, 貴洋辻野 та Takahiro TSUJINO. "フェーズフィールドモデルによる析出相内部の応力変化と残留応力のシミュレーション". 日本機械学会, 2006. http://hdl.handle.net/2237/9013.

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Книги з теми "Thermal field model"

Nicol, Fergus. Thermal comfort: A handbook for field studies toward an adaptive model. London: University ofEast London, on behalf of the UK Collaborative Group on Thermal Comfort, 1993.

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Miller, Robert T. Field observations, preliminary model analysis, and aquifer thermal efficiency: Cyclic injection, storage, and withdrawal of heated water in a sandstone aquifer at St. Paul, Minnesota. Washington: U.S. G.P.O., 1993.

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Anholt, Robert. Electrical and thermal characterization of MESFETs, HEMTs, and HBTs. Boston: Artech House, 1995.

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service), SpringerLink (Online, ed. From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence: The AdS/CFT Correspondence. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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S̆imunić, Dina. Thermal and stimutalting effects of time-varying magnetic fields during MRI. Aachen: Shaker, 1995.

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Magdalena, Nuñez, ed. Progress in electrochemistry research. Hauppauge, N.Y: Nova Science Publishers, 2005.

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Lorenzo, Pareschi, and Russo Giovanni, eds. Modelling and numerics of kinetic dissipative systems. Hauppauge, N.Y: Nova Science Publishers, 2005.

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P, Norris Charles, ed. Surface science: New research. Hauppauge, N.Y: Nova Science Publishers, 2005.

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N, Linke A., ed. Progress in chemical physics research. Hauppauge, N.Y: Nova Science Publishers, 2005.

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Magdalena, Nuñez, ed. Trends in electrochemistry research. New York: Nova Science Publishers, 2005.

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Частини книг з теми "Thermal field model"

Denny, Allen, Neelkanth Kirloskar, Babu Rao Ponangi, Rex Joseph, and V. Krishna. "Electro-Thermal Model for Field Effective Transistors." In Recent Advances in Hybrid and Electric Automotive Technologies, 277–84. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2091-2_21.

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Jensen, Kevin L. "A Thermal-Field-Photoemission Model and Its Application." In Modern Developments in Vacuum Electron Sources, 345–85. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47291-7_8.

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Svehla, Drazen. "Model of Solar Radiation Pressure and Thermal Re-radiation." In Geometrical Theory of Satellite Orbits and Gravity Field, 269–95. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76873-1_19.

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Liu, Hong, Jin Guo Li, and Yong Tian Wang. "Fast Computing Model for Thermal Field of Auto Lamp." In Optics Design and Precision Manufacturing Technologies, 783–88. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-458-8.783.

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Sun, Zichao, Weicun Zhang, and Yan Liu. "Research on the Temperature Field and Thermal Roll Shape of Cold Rolling Model." In Proceedings of the 11th International Conference on Modelling, Identification and Control (ICMIC2019), 475–84. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0474-7_45.

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Wu, Weige, and Gang Liu. "Modeling and Validation of Thermal-Fluid Field of Transformer Winding Based on a Product-Level Heating and Cooling Model." In Modeling and Application of Electromagnetic and Thermal Field in Electrical Engineering, 665–85. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0173-9_16.

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Martin, Katharina, Dennis Daub, Burkard Esser, Ali Gülhan, and Stefanie Reese. "Numerical Modelling of Fluid-Structure Interaction for Thermal Buckling in Hypersonic Flow." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 341–55. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_22.

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Abstract Experiments have shown that a high-enthalpy flow field might lead under certain mechanical constraints to buckling effects and plastic deformation. The panel buckling into the flow changes the flow field causing locally increased heating which in turn affects the panel deformation. The temperature increase due to aerothermal heating in the hypersonic flow causes the metallic panel to buckle into the flow. To investigate these phenomena numerically, a thermomechanical simulation of a fluid-structure interaction (FSI) model for thermal buckling is presented. The FSI simulation is set up in a staggered scheme and split into a thermal solid, a mechanical solid and a fluid computation. The structural solver Abaqus and the fluid solver TAU from the German Aerospace Center (DLR) are coupled within the FSI code ifls developed at the Institute of Aircraft Design and Lightweight Structures (IFL) at TU Braunschweig. The FSI setup focuses on the choice of an equilibrium iteration method, the time integration and the data transfer between grids. To model the complex material behaviour of the structure, a viscoplastic material model with linear isotropic hardening and thermal expansion including material parameters, which are nonlinearly dependent on temperature, is used.

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Barfusz, Oliver, Felix Hötte, Stefanie Reese, and Matthias Haupt. "Pseudo-transient 3D Conjugate Heat Transfer Simulation and Lifetime Prediction of a Rocket Combustion Chamber." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 265–78. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_17.

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Abstract Rocket engine nozzle structures typically fail after a few engine cycles due to the extreme thermomechanical loading near the nozzle throat. In order to obtain an accurate lifetime prediction and to increase the lifetime, a detailed understanding of the thermomechanical behavior and the acting loads is indispensable. The first part is devoted to a thermally coupled simulation (conjugate heat transfer) of a fatigue experiment. The simulation contains a thermal FEM model of the fatigue specimen structure, RANS simulations of nine cooling channel flows and a Flamelet-based RANS simulation of the hot gas flow. A pseudo-transient, implicit Dirichlet–Neumann scheme is utilized for the partitioned coupling. A comparison with the experiment shows a good agreement between the nodal temperatures and their corresponding thermocouple measurements. The second part consists of the lifetime prediction of the fatigue experiment utilizing a sequentially coupled thermomechanical analysis scheme. First, a transient thermal analysis is carried out to obtain the temperature field within the fatigue specimen. Afterwards, the computed temperature serves as input for a series of quasi-static mechanical analyses, in which a viscoplastic damage model is utilized. The evolution and progression of the damage variable within the regions of interest are thoroughly discussed. A comparison between simulation and experiment shows that the results are in good agreement. The crucial failure mode (doghouse effect) is captured very well.

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Zhao, Junwei, Xuming Mao, Ruhua Wang, Wenjiang Wang, Zhenwei Zhang, and Hongjun Xue. "Numerical Simulation of Inner Hydro-field and Comfortable Evaluation Based on Human Thermal Comfortable Model in Cockpit." In Informatics in Control, Automation and Robotics, 543–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25899-2_73.

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Gentilal, Nichal, Ricardo Salvador, and Pedro Cavaleiro Miranda. "A Thermal Study of Tumor-Treating Fields for Glioblastoma Therapy." In Brain and Human Body Modeling 2020, 37–62. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45623-8_3.

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AbstractTumor-treating fields (TTFields) is an antimitotic cancer treatment technique used for glioblastoma multiforme (GBM) and malignant pleural mesothelioma. Although the frequency used is not as high as in hyperthermia, temperature increases due to the Joule effect might be meaningful given the necessary time that these fields should be applied for. Post hoc analysis of the EF-11 clinical trial showed higher median overall survival in patients whose compliance was at least 18 h per day. To quantify these temperature increases and predict the thermal impact of TTFields delivery to the head, we used a realistic model created from MR images segmented in five tissues: scalp, skull, CSF, gray matter (GM), and white matter (WM). Through COMSOL Multiphysics, we solved Laplace’s equation for the electric field and Pennes’ equation for the temperature distribution. To mimic the therapy as realistically as possible, we also considered complete current shutdown whenever any transducer reached 41 °C to allow transducers and tissues’ temperature to decrease. Our results indicate an intermittent operation of Optune due to this necessary current shutdown. Localized temperature increases were seen, especially underneath the regions where the transducers were placed. Maximum temperature values were around 41.5 °C on the scalp and 38 °C on the brain. According to the literature, significant thermal impact is only predicted for the brain where the rise in temperature may lead to an increased BBB permeability and variation in the blood flow and neurotransmitter concentration. Additionally, our results showed that if the injected current is reduced by around 25% compared to Optune’s standard way of operating, then uninterrupted treatment might be attainable. These predictions might be used to improve TTFields delivery in real patients and to increase awareness regarding possible thermal effects not yet reported elsewhere.

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Тези доповідей конференцій з теми "Thermal field model"

Ababneh, Mohammed T., Frank M. Gerner, Pramod Chamarthy, Peter de Bock, Shakti Chauhan, and Tao Deng. "Thermo-Fluid Model for High Thermal Conductivity Thermal Ground Planes." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75185.

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The thermal ground plane (TGP) is an advanced planar heat pipe designed for cooling microelectronics in high gravitational fields. A thermal resistance model is developed to predict the thermal performance of the TGP, including the effects of the presence of non-condensable gases (NCGs). Viscous laminar flow pressure losses are predicted to determine the maximum heat load when the capillary limit is reached. This paper shows that the axial effective thermal conductivity of the TGP decreases when the substrate and/or wick are thicker and/or with the presence of NCGs. Moreover, it was demonstrated that the thermo-fluid model may be utilized to optimize the performance of the TGP by estimating the limits of wick thickness and vapor space thickness for a recognized internal volume of the TGP. The wick porosity plays an important effect on maximum heat transport capability. A large adverse gravitational field strongly decreases the maximum heat transport capability of the TGP. Axial effective thermal conductivity is mostly unaffected by the gravitational field. The maximum length of the TGP before reaching the capillary limit is inversely proportional to input power.

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Schaich, David, Raghav G. Jha, and Anosh Joseph. "Thermal phase structure of a supersymmetric matrix model." In 37th International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.363.0069.

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Pardo, F., P. Lopez, D. Cabello, and M. Balsi. "FPGA Implementation of 3-D Thermal Model Simulator." In 2006 International Conference on Field Programmable Logic and Applications. IEEE, 2006. http://dx.doi.org/10.1109/fpl.2006.311278.

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Jia, Wangkun, Brian T. Helenbrook, and Ming-C. Cheng. "Thermal modeling of multi-gate field effect transistors based on a reduced order model." In 2014 30th Semiconductor Thermal Measurement & Management Symposium (SEMI-THERM). IEEE, 2014. http://dx.doi.org/10.1109/semi-therm.2014.6892245.

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Lin, M. C. "A self-consistent general thermal field emission model." In 2012 IEEE 39th International Conference on Plasma Sciences (ICOPS). IEEE, 2012. http://dx.doi.org/10.1109/plasma.2012.6383346.

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Lin, M. C. "A self-consistent general thermal field emission model." In 2012 IEEE Thirteenth International Vacuum Electronics Conference (IVEC). IEEE, 2012. http://dx.doi.org/10.1109/ivec.2012.6262201.

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Yifeng, Wang, Yuan Kejian, Liu Yongzhi, and Liu Shuang. "A 3-D Thermal Field Model in Phosphate Glass." In 2006 International Conference on Communications, Circuits and Systems. IEEE, 2006. http://dx.doi.org/10.1109/icccas.2006.285053.

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Pinto Fortkamp, Fábio, Jader Barbosa, and Jaime Lozano. "Analytical model of the magnetic field generated by nested infinite Halbach cylinders." In 16th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2016. http://dx.doi.org/10.26678/abcm.encit2016.cit2016-0220.

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Maranda, W., and M. Piotrowicz. "Extraction of thermal model parameters for field-installed photovoltaic module." In 2010 27th International Conference on Microelectronics (MIEL 2010). IEEE, 2010. http://dx.doi.org/10.1109/miel.2010.5490512.

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Saito, Hana, Mari Carmen Banuls, Krzysztof Cichy, J. Ignacio Cirac, and Karl Jansen. "Thermal evolution of the 1-flavour Schwinger model with using Matrix Product States." In The 33rd International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.251.0283.

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Звіти організацій з теми "Thermal field model"

Doughty, C., and Aharon, Tsang, Chin-Fu Nir. Seasonal thermal energy storage in unsaturated soils: Model development and field validation. Office of Scientific and Technical Information (OSTI), June 1991. http://dx.doi.org/10.2172/10176364.

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Wang, D. Far-field model of the regional influence of effluent plumes from ocean thermal energy conversion (OTEC) plants. Office of Scientific and Technical Information (OSTI), July 1985. http://dx.doi.org/10.2172/5451995.

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Davidson, R. C., P. Stoltz, and C. Chen. Intense nonneutral beam propagation in a periodic solenoidal field using a macroscopic fluid model with zero thermal emittance. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/304187.

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Clausen, Jay, Michael Musty, Anna Wagner, Susan Frankenstein, and Jason Dorvee. Modeling of a multi-month thermal IR study. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41060.

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Inconsistent and unacceptable probability of detection (PD) and false alarm rates (FAR) due to varying environmental conditions hamper buried object detection. A 4-month study evaluated the environmental parameters impacting standoff thermal infra-red(IR) detection of buried objects. Field observations were integrated into a model depicting the temporal and spatial thermal changes through a 1-week period utilizing a 15-minute time-step interval. The model illustrates the surface thermal observations obtained with a thermal IR camera contemporaneously with a 3-d presentation of subsurface soil temperatures obtained with 156 buried thermocouples. Precipitation events and subsequent soil moisture responses synchronized to the temperature data are also included in the model simulation. The simulation shows the temperature response of buried objects due to changes in incoming solar radiation, air/surface soil temperature changes, latent heat exchange between the objects and surrounding soil, and impacts due to precipitation/changes in soil moisture. Differences are noted between the thermal response of plastic and metal objects as well as depth of burial below the ground surface. Nearly identical environmental conditions on different days did not always elicit the same spatial thermal response.

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VanderGheynst, Jean, Michael Raviv, Jim Stapleton, and Dror Minz. Effect of Combined Solarization and in Solum Compost Decomposition on Soil Health. United States Department of Agriculture, October 2013. http://dx.doi.org/10.32747/2013.7594388.bard.

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In soil solarization, moist soil is covered with a transparent plastic film, resulting in passive solar heating which inactivates soil-borne pathogen/weed propagules. Although solarization is an effective alternative to soil fumigation and chemical pesticide application, it is not widely used due to its long duration, which coincides with the growing season of some crops, thereby causing a loss of income. The basis of this project was that solarization of amended soil would be utilized more widely if growers could adopt the practice without losing production. In this research we examined three factors expected to contribute to greater utilization of solarization: 1) investigation of techniques that increase soil temperature, thereby reducing the time required for solarization; 2) development and validation of predictive soil heating models to enable informed decisions regarding soil and solarization management that accommodate the crop production cycle, and 3) elucidation of the contributions of microbial activity and microbial community structure to soil heating during solarization. Laboratory studies and a field trial were performed to determine heat generation in soil amended with compost during solarization. Respiration was measured in amended soil samples prior to and following solarization as a function of soil depth. Additionally, phytotoxicity was estimated through measurement of germination and early growth of lettuce seedlings in greenhouse assays, and samples were subjected to 16S ribosomal RNA gene sequencing to characterize microbial communities. Amendment of soil with 10% (g/g) compost containing 16.9 mg CO2/g dry weight organic carbon resulted in soil temperatures that were 2oC to 4oC higher than soil alone. Approximately 85% of total organic carbon within the amended soil was exhausted during 22 days of solarization. There was no significant difference in residual respiration with soil depth down to 17.4 cm. Although freshly amended soil proved highly inhibitory to lettuce seed germination and seedling growth, phytotoxicity was not detected in solarized amended soil after 22 days of field solarization. The sequencing data obtained from field samples revealed similar microbial species richness and evenness in both solarized amended and non-amended soil. However, amendment led to enrichment of a community different from that of non-amended soil after solarization. Moreover, community structure varied by soil depth in solarized soil. Coupled with temperature data from soil during solarization, community data highlighted how thermal gradients in soil influence community structure and indicated microorganisms that may contribute to increased soil heating during solarization. Reliable predictive tools are necessary to characterize the solarization process and to minimize the opportunity cost incurred by farmers due to growing season abbreviation, however, current models do not accurately predict temperatures for soils with internal heat generation associated with the microbial breakdown of the soil amendment. To address the need for a more robust model, a first-order source term was developed to model the internal heat source during amended soil solarization. This source term was then incorporated into an existing “soil only” model and validated against data collected from amended soil field trials. The expanded model outperformed both the existing stable-soil model and a constant source term model, predicting daily peak temperatures to within 0.1°C during the critical first week of solarization. Overall the results suggest that amendment of soil with compost prior to solarization may be of value in agricultural soil disinfestations operations, however additional work is needed to determine the effects of soil type and organic matter source on efficacy. Furthermore, models can be developed to predict soil temperature during solarization, however, additional work is needed to couple heat transfer models with pathogen and weed inactivation models to better estimate solarization duration necessary for disinfestation.

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Doyle, Jesse D., Nolan R. Hoffman, and M. Kelvin Taylor. Aircraft Arrestor System Panel Joint Improvement. U.S. Army Engineer Research and Development Center, August 2021. http://dx.doi.org/10.21079/11681/41342.

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Aircraft Arresting Systems (AAS) for military applications utilize sacrificial panels made of Ultra-High Molecular Weight polyethylene (UHMWPE) that are embedded into the pavement beneath the AAS cable to protect the pavement from cable damage. Problems have been observed with the materials and practices used to seal the UHMWPE panel joints from water and debris. Data obtained from laboratory and field studies were used make improvements to current practice for sealing UHMWPE panel joints. The study evaluated four joint-sealant materials, eight alternative surface treatment and preparation techniques to promote adhesion to UHMWPE, and seven joint-edge geometries. Bond-strength testing of joint-sealant specimens was conducted in the laboratory, followed by field evaluation of construction techniques. Field performance of the joint systems was monitored for 24 months after installation. Additionally, a thermal response model was developed to refine the joint design dimensions. Results confirmed that the best material to use was self-leveling silicone joint sealant. It was recommended that a dovetail groove be cut into the edge of UHMW panels to provide positive mechanical interlock and to reduce adhesive failures of the sealant. It was also recommended that the panel-to-panel joint-sealant reservoir be widened to prevent sealant compression damage.

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Greenberg, H., M. Sutton, M. Sharma, and A. Barnwell. REPOSITORY NEAR-FIELD THERMAL MODELING UPDATEINCLUDING ANALYSIS OF OPEN MODE DESIGN CONCEPTS - DRAFT REV. M. Office of Scientific and Technical Information (OSTI), July 2012. http://dx.doi.org/10.2172/1056623.

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Liu, H. H., L. Li, L. Zheng, J. E. Houseworth, and J. Rutqvist. Investigations of Near-Field Thermal-Hydrologic-Mechanical-Chemical Models for Radioactive Waste Disposal in Clay/Shale Rock. Office of Scientific and Technical Information (OSTI), June 2011. http://dx.doi.org/10.2172/1050698.

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Baral, Aniruddha, Jeffrey Roesler, M. Ley, Shinhyu Kang, Loren Emerson, Zane Lloyd, Braden Boyd, and Marllon Cook. High-volume Fly Ash Concrete for Pavements Findings: Volume 1. Illinois Center for Transportation, September 2021. http://dx.doi.org/10.36501/0197-9191/21-030.

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High-volume fly ash concrete (HVFAC) has improved durability and sustainability properties at a lower cost than conventional concrete, but its early-age properties like strength gain, setting time, and air entrainment can present challenges for application to concrete pavements. This research report helps with the implementation of HVFAC for pavement applications by providing guidelines for HVFAC mix design, testing protocols, and new tools for better quality control of HVFAC properties. Calorimeter tests were performed to evaluate the effects of fly ash sources, cement–fly ash interactions, chemical admixtures, and limestone replacement on the setting times and hydration reaction of HVFAC. To better target the initial air-entraining agent dosage for HVFAC, a calibration curve between air-entraining dosage for achieving 6% air content and fly ash foam index test has been developed. Further, a digital foam index test was developed to make this test more consistent across different labs and operators. For a more rapid prediction of hardened HVFAC properties, such as compressive strength, resistivity, and diffusion coefficient, an oxide-based particle model was developed. An HVFAC field test section was also constructed to demonstrate the implementation of a noncontact ultrasonic device for determining the final set time and ideal time to initiate saw cutting. Additionally, a maturity method was successfully implemented that estimates the in-place compressive strength of HVFAC through wireless thermal sensors. An HVFAC mix design procedure using the tools developed in this project such as the calorimeter test, foam index test, and particle-based model was proposed to assist engineers in implementing HVFAC pavements.

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Chen, Z., S. E. Grasby, C. Deblonde, and X. Liu. AI-enabled remote sensing data interpretation for geothermal resource evaluation as applied to the Mount Meager geothermal prospective area. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330008.

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The objective of this study is to search for features and indicators from the identified geothermal resource sweet spot in the south Mount Meager area that are applicable to other volcanic complexes in the Garibaldi Volcanic Belt. A Landsat 8 multi-spectral band dataset, for a total of 57 images ranging from visible through infrared to thermal infrared frequency channels and covering different years and seasons, were selected. Specific features that are indicative of high geothermal heat flux, fractured permeable zones, and groundwater circulation, the three key elements in exploring for geothermal resource, were extracted. The thermal infrared images from different seasons show occurrence of high temperature anomalies and their association with volcanic and intrusive bodies, and reveal the variation in location and intensity of the anomalies with time over four seasons, allowing inference of specific heat transform mechanisms. Automatically extracted linear features using AI/ML algorithms developed for computer vision from various frequency bands show various linear segment groups that are likely surface expression associated with local volcanic activities, regional deformation and slope failure. In conjunction with regional structural models and field observations, the anomalies and features from remotely sensed images were interpreted to provide new insights for improving our understanding of the Mount Meager geothermal system and its characteristics. After validation, the methods developed and indicators identified in this study can be applied to other volcanic complexes in the Garibaldi, or other volcanic belts for geothermal resource reconnaissance.

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