Готові списки джерел за темами / Thermal losse

Добірка наукової літератури з теми "Thermal losse"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Thermal losse"

1

Logachevsky, Ivan A. "THERMAL IMAGE ANALYSIS." SOFT MEASUREMENTS AND COMPUTING 8, no. 57 (2022): 18–30. http://dx.doi.org/10.36871/2618-9976.2022.08.002.

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The equipment of thermal stations and heating networks, which is subject to corrosion and is often far from new, loses its original characteristics over time. Such processes, potentially leading to heat losses and coolant leaks, can lead to significant financial and environmental consequences. Infrared thermography is one of the effective problemsolving methods that helps to detect defects and reduce risks. This article discusses some details of the current project for the analysis of thermal images using convolutional neural networks.
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2

Yuan, Hong-Chun, and Xue-Xiang Xu. "Squeezed vacuum state in lossy channel as a squeezed thermal state." Modern Physics Letters B 29, no. 33 (December 10, 2015): 1550219. http://dx.doi.org/10.1142/s021798491550219x.

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In this paper, we alternatively study the evolution of squeezed vacuum state (SVS) in lossy channel by virtue of the phase space method. By using the formula of Wigner function (WF) in coherent representation and [Formula: see text] representation of quantum density operator, the WF formula in lossy channel is derived. After obtaining the analytical expressions of the WFs of the lossy SVS and the squeezed thermal state (STS), we further prove the fact that the lossy SVS is equivalent to a kind of STS. Our result is useful in dealing with the light field transmission problems in the presence of losses.
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3

Kosiński, Piotr, and Robert Wójcik. "An Impact of Air Permeability on Heat Transfer through Partitions Insulated with Loose Fiber Materials." Applied Mechanics and Materials 861 (December 2016): 190–97. http://dx.doi.org/10.4028/www.scientific.net/amm.861.190.

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The paper presents the problem of windwashing in partitions including air permeable thermal insulations. There are technical solutions, which deliberately accept the filtration of air in the insulating layer, guided by the necessity of possible drying of building materials. Some scientific papers even suggest that the air infiltration decrease the heat losses through ventilation. In result there occur heat losses in building heat balance which are underestimated and therefore difficult to take into account during calculations. Heat changes on the inner surface of the building partition occur with a delay to the initiation of the wind. However, even the short-term local wind speed loads on thermal insulations result in temperature decreasing and therefore possible condensation on the inner surface of the building partition. The article presents laboratory measurements of air permeability of loose mineral wool and laboratory investigation of the impact of air filtration on heat transfer in lightweight partitions filled with loose thermal insulation.
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4

Yamashita, Hiroyuki, Hidefumi Fujimoto, Masahiko Fujimoto, Tatsuya Tanaka, and Hiroyuki Yamamoto. "OS1-3 Thermal Efficiency improvement by increasing compression Ratio and Reducing Cooling Loss(OS1: Ultimate thermal efficiency,Organized Session Papers)." Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines 2012.8 (2012): 36–42. http://dx.doi.org/10.1299/jmsesdm.2012.8.36.

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5

Zhu, Fang-Long, Qian-Qian Feng, Qun Xin, and Yu Zhou. "Thermal degradation process of polysulfone aramid fiber." Thermal Science 18, no. 5 (2014): 1637–41. http://dx.doi.org/10.2298/tsci1405637z.

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Polysulfone aramid fiber is one kind of high temperature fibers. In the paper, thermal degradation behavior and kinetics of polysulfone aramid fiber were investigated by thermogravimetric analysis and differential thermogravimetric at different heating rates under nitrogen and air, respectively. The experimental results show that its initial degradation temperature is 375?C in nitrogen and 410?C in air at heating rate of 10 K/min. When temperature went to 800?C, the fiber loses all mass in air. The mass losses in the stage showed that degradation of polysulfone aramid occurs in two-step process as could be concluded by the presence of two distinct exothermic peaks in differential thermogravimetric curves.
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6

Tournemenne, Robin, and Juliette Chabassier. "A Comparison of a One-Dimensional Finite Element Method and the Transfer Matrix Method for the Computation of Wind Music Instrument Impedance." Acta Acustica united with Acustica 105, no. 5 (July 1, 2019): 838–49. http://dx.doi.org/10.3813/aaa.919364.

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This work presents a computation tool for the calculation of wind instrument input impedance in the context of linear planar wave propagation with visco-thermal losses. The originality of the approach lies in the usage of a specific and simple 1D finite element method (FEM). The popular Transfer Matrix Method (TMM) is also recalled and a seamless formulation is proposed which unifies the cases cylinders vs. cones. Visco-thermal losses, which are natural dissipation in the system, are not exactly taken into account by this method when arbitrary shapes are considered. The introduction of an equivalent radius leads to an approximation that we quantify using the FEM method. The equation actually solved by the TMM in this case is exhibited. The accuracy of the two methods (FEM and TMM) and the associated computation times are assessed and compared. Although the TMM is more efficient in lossless cases and for lossy cylinders, the FEM is shown to be more efficient when targeting a specific precision in the realistic case of a lossy trumpet. Some additional features also exhibit the robustness and flexibility of the FEM over the TMM. All the results of this article are computed using the open-source python toolbox OpenWind.
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7

Kaiser, Waldemar, Michael Haider, Johannes A. Russer, Peter Russer, and Christian Jirauschek. "Markovian Dynamics of Josephson Parametric Amplification." Advances in Radio Science 15 (September 21, 2017): 131–40. http://dx.doi.org/10.5194/ars-15-131-2017.

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Abstract. In this work, we derive the dynamics of the lossy DC pumped non-degenerate Josephson parametric amplifier (DCPJPA). The main element in a DCPJPA is the superconducting Josephson junction. The DC bias generates the AC Josephson current varying the nonlinear inductance of the junction. By this way the Josephson junction acts as the pump oscillator as well as the time varying reactance of the parametric amplifier. In quantum-limited amplification, losses and noise have an increased impact on the characteristics of an amplifier. We outline the classical model of the lossy DCPJPA and derive the available noise power spectral densities. A classical treatment is not capable of including properties like spontaneous emission which is mandatory in case of amplification at the quantum limit. Thus, we derive a quantum mechanical model of the lossy DCPJPA. Thermal losses are modeled by the quantum Langevin approach, by coupling the quantized system to a photon heat bath in thermodynamic equilibrium. The mode occupation in the bath follows the Bose-Einstein statistics. Based on the second quantization formalism, we derive the Heisenberg equations of motion of both resonator modes. We assume the dynamics of the system to follow the Markovian approximation, i.e. the system only depends on its actual state and is memory-free. We explicitly compute the time evolution of the contributions to the signal mode energy and give numeric examples based on different damping and coupling constants. Our analytic results show, that this model is capable of including thermal noise into the description of the DC pumped non-degenerate Josephson parametric amplifier.
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8

Pashentsev, A. I., A. A. Garmider та L. V. Pashentsenva. "МЕTHODOLODGICAL APPROACH TO ESTIMATION OF THERMAL LOSSES OF THERMAL NETWORK TAKING INTO THERMAL INTERFERENCE". Construction economic and environmental management 81, № 4 (2022): 13–22. http://dx.doi.org/10.37279/2519-4453-2021-4-13-22.

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The author’s vision of a methodical approach to estimation of thermal losses of a channel-less thermal network is presented at the base, which is the determination of specific thermal losses caused by the thermal interference process. There was carried out systematization of existing approaches to estimation of thermal losses of heat networks with identification of positive and negative features, the logical scheme of thermal interference process implementation at movement of high-temperature heat carrier in heat supply line of heat network is justified. Mathematical interpretation of methodical approach to estimation of thermal losses of channel-less heat networks is presented taking into account thermal interference, which includes twelve successively performed calculation stages.
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9

Kosiński, Piotr, Robert Wójcik, Dariusz Skoratko, and Shady Attia. "An impact of moisture content on the air permeability of the fibrous insulation materials." Journal of Physics: Conference Series 2069, no. 1 (November 1, 2021): 012205. http://dx.doi.org/10.1088/1742-6596/2069/1/012205.

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Abstract Fibrous materials are characterized by good thermal properties, but are susceptible to air filtration. Effective air and wind protection of the building envelope eliminate the problem of air penetration of fibrous materials, but there are still many buildings where this protection has not been applied. Authors investigated the effect of moisture content on the air permeability of chosen loose fibrous materials: mineral wool, wood wool and cellulose fibers. The presented results may be used to simulate and calculate heat loses in existing buildings.
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10

Joshi, Pratik M., Shekhar T. Shinde, and Kedarnath Chaudhary. "A Case Study on Assessment Performance and Energy Efficient Recommendations for Industrial Boiler." International Journal of Research and Review 8, no. 4 (April 6, 2021): 61–69. http://dx.doi.org/10.52403/ijrr.20210410.

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As India is a developing country, industrialization is increasing day by day and there is a great need for industry energy audit. Audit helps to maintain and save energy from being wasted and helps in achieving highest efficiency of industrial equipment. This paper contains an actual industry audit report on boiler performance. This paper contains a report on Thermal analysis of boilers, thermal skin heat loss of boilers, O2 percentage control in flue gases to standard values, effect of coal additive, etc. This paper also contains a report on waste heat recovery options for thermal boiler, flue efficiency monitor, infrared thermometer, ultrasonic peak detector IR thermal imager. These equipment are used for energy assessment of boilers. Thermography survey of boiler surface is carried out to estimate the radiation and the other losses and the result of this total annual saving after insulation repairing or maintenance is Rs.8.48 lakh and investment is around Rs.6.31 lakh. Economizer performance of both the ISGEC and Thermax boiler can be improved with the help of suggested measures. It will help to save approximately rupees Rs.38.42 Lakh annually and investment on maintenance cost is negligible. In short, this paper deals with assessment of all boilers, evaluates their efficiencies and losses to identify energy saving opportunities and presents them in a report with their payback periods. Keywords: Energy, Energy audit, assessment, boiler.
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Дисертації з теми "Thermal losse"

1

Gretarsson, Andri Marcus. "Thermal noise in low loss flexures." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2002. http://wwwlib.umi.com/cr/syr/main.

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2

Scheck, Christopher G. "Thermal Hysteresis loss in gas springs." Ohio University / OhioLINK, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1182870415.

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3

Bousbaine, Amar. "An investigation into the thermal modelling of induction motors." Thesis, University of Sheffield, 1993. http://etheses.whiterose.ac.uk/1824/.

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Анотація:
Electric motors are the ubiquitous workhorses of the industry, working a in wide range of conditions and applications. Modern motors, designed to exact ratings using new materials improved manufacturing techniques, are now much smaller but have higher loadings. They are being operated much nearer to the point of overload then ever before. To ensure a satisfactory life span for the motor, temperature rise must be limited to safe values. A lumped parameter thermal model has been developed, which allows rapid and accurate estimation of the temperature distribution in a machine. The lumped parameter thermal model depends on the accurate knowledge of the thermal coefficients and more importantly the loss distribution. Hence the temperature time technique was implemented to investigate the iron loss density distribution. Experimental results are discussed and loss density information throughout the volume of the machine was generated. A novel method of determining the thermal coefficients employed in the heat flow equation was investigated, using the thermal lumped parameter model of a machine. Finally a 2-D finite element method was used to corroborate, or otherwise, the use of the lumped thermal network model.
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4

Šumić, Mersiha. "Thermal Performance of a Solarus CPC-Thermal Collector." Thesis, Högskolan Dalarna, Energi och miljöteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:du-14526.

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Анотація:
The  aim  of  this  master  thesis  is  an  investigation  of  the  thermal  performance  of  a  thermal compound parabolic concentrating (CPC) collector from Solarus. The collector consists of two troughs with absorbers which are coated with different types of paint with  unknown  properties.  The  lower  and  upper  trough  of  the  collector  have  been  tested individually. In  order  to  accomplish  the  performance  of  the  two  collectors,  a  thorough  literature  study  in  the  fields  of  CPC  technology,  various  test  methods,  test  standards  for  solar thermal  collectors  as  well  as  the  latest  articles  relating  on  the  subject  were  carried  out. In addition, the set‐up of the thermal test rig was part of the thesis as well. The thermal  performance  was  tested  according  to  the  steady  state  test  method  as  described in the European standard 12975‐2. Furthermore, the thermal performance of  a  conventional  flat  plate  collector  was  carried  out  for  verification  of  the  test  method. The  CPC‐Thermal  collector  from  Solarus  was  tested  in  2013  and  the  results  showed  four  times  higher  values  of  the  heat  loss  coefficient  UL (8.4  W/m²K)  than  what  has been reported for a commercial collector from Solarus. This value was assumed to be too large and it was assumed that the large value was a result of the test method used that time. Therefore, another aim was the comparison of the results achieved in this work with the results from the tests performed in 2013. The results of the thermal performance showed that the optical efficiency of the lower trough of the CPC‐T collector is 77±5% and the corresponding heat loss coefficient UL 4.84±0.20  W/m²K.  The  upper  trough  achieved  an  optical  efficiency  of  75±6  %  and  a  heat loss coefficient UL of 6.45±0.27 W/m²K. The results of the heat loss coefficients  are  valid  for  temperature  intervals  between  20°C  and  80°C.  The  different  absorber paintings have a significant impact on the results, the lower trough performs overall better.  The  results  achieved  in  this  thesis  show  lower  heat  loss  coefficients UL and higher optical efficiencies compared to the results from 2013.
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5

Oberdorf, Michael Craig. "Power losses and thermal modeling of a voltage source inverter." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FOberdorf.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, March 2006.
Thesis Advisor(s): Alexander Julian. "March 2006." Includes bibliographical references (p. 103-104). Also available online.
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6

Cavallucci, Lorenzo <1989&gt. "Thermal Stability and AC Losses in High-Field Superconducting Magnets." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amsdottorato.unibo.it/8683/1/PhD_Thesis_Cavallucci.pdf.

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The study and the analysis of quench initiation and propagation is of paramount importance in the design of any superconducting magnets. Several disturbances such as ac losses, failures of the cryogenics or heat load may induce the quench initiation on a magnet and determine its irreversible transition to the normal state. Since the early days of magnet construction, the scientific community has devoted significant efforts in the study of quench. In the present work, numerical methodologies are presented and discussed for the analysis of electro-thermal stability, quench propagation and temperature margin on superconducting cables and coils. The proposed models are applied to the analysis of several superconducting magnets under development in different research groups in Europe (EU) and United States (US). The comparison of the numerical results with the experimental tests or with different computational approaches make the author confident about the applicability and reliability of the proposed modelling techniques.
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7

Khalifa, Abdul-Jabbar N. "Heat transfer processes in buildings." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254459.

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8

Kolbe, Isobel. "pQCD energy loss and thermal field theory in small systems." Doctoral thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/30385.

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In recent years, experiments at the Large Hadron Collider and the Relativistic Heavy Ion Collider have discovered that many of the signatures that are traditionally ascribed to the presence of a quark-gluon plasma (QGP) in central heavy-ion collisions also manifest in certain classes of peripheral heavy-ion collisions as well as in smaller colliding systems. The glaring exception to this list of observations of QGP signatures in small systems is the partonic energy loss. However, current theoretical descriptions of partonic energy loss are ill-adapted to small systems. This thesis first presents a numerical analysis of an analytical small system extension of a standard energy loss formula, and finds that major inconsistencies in the description of small system energy loss persist, motivating a need for a first principles calculation of the properties of a small droplet of QGP. Thereafter, a first step toward such a calculation is presented by considering a single, massless, scalar field that has been geometrically confined by means of Dirichlet boundary conditions. This toy model reveals, via thermal field theoretic techniques, that quantum fields are very sensitive to the presence of a boundary, presenting significant deviations from the Stefan-Boltzmann limit and revealing a geometrically driven phase transition at the scale of the medium.
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9

Zammit, Jean-Paul. "Managing engine thermal state to reduce friction losses during warm-up." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13180/.

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The thermal behaviour of a 2.4 l direct injection diesel engine has been investigated to identify how the fuel consumption penalty associated with operation during warm–up can be minimised. A version of PROMETS (Programme for Modelling Engine Thermal Systems) was developed to support the investigations. The developments improved the representation of thermal-friction conditions in the oil circuit, extended the piston heat transfer sub-model to account for the effects of piston cooling jets and introduced a main bearing thermal-friction model to predict friction and oil film temperatures. Computational studies were complemented by an experimental investigation of the effectiveness of pre-heating the oil feed to the bearings. Results show that heat transfer from the oil film to the bearings shells and crankshaft journal reduces the benefit in friction savings. Other measures considered were exhaust gas heat recovery, repositioning of the oil main gallery within the block, thermal energy storage, reductions in engine thermal capacity and a novel split-EGR cooler able to cool the EGR gases and heat either the coolant or oil streams. All of the above measures were investigated in isolation, but where appropriate different measures were adopted in conjunction to achieve even greater fuel savings. During warm-up the energy available to raise fluid temperatures is small. As a result, over the New European Drive Cycle, thermal energy storage showed the greatest benefits. Given an available source of thermal energy which can be transferred to the oil over a chosen time, simulations indicate that a higher power input over a shorter period is most beneficial. This reflects the increased sensitivity of oil viscosity to temperature changes at colder temperatures which in turn means that the potential to reduce friction is highest in the first minutes after engine start up but drops rapidly hereafter. Results also show how the balance of energy transfers out of the oil changes as the engine warms up and point to the importance of oil interaction with components in the lower parts of the engine which have a large thermal capacity, such as elements supporting the main bearings, the crankshaft and the lower liner which limit the rate of temperature rise of the oil. A combination of supplementary heat introduction into the oil circuit from a thermal store and an elimination of heat losses from the oil to the lower parts of the engine resulted in a fuel consumption saving close to that achieved by starting the engine fully warm, which equates to around 6% improvement.
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10

Addison, James Edward. "The benefits of thermal management to reduce friction losses in engines." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/29002/.

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The research reported in the thesis addresses questions of how engine fuel consumption and carbon dioxide emissions are can be reduced through improvements in thermal management, lubricant design, and energy recovery. The investigations are based on simulation studies using computational models and sub-models developed or revised during the work, and results provided by complementary experimental studies carried out by collaborating investigators. The brake thermal efficiency of the internal combustion engines (ICE) used in cars and light duty commercial vehicles is reduced by frictional losses. These losses vary with engine design, lubricant formulation and thermal state. They are most significant when the engine is running cold or partially warm. Over the New European Drive Cycle (NEDC), engine friction losses raise vehicle fuel consumption by several percentage points. A version of the computational model, PROMETS, has been developed and applied in studies of thermal behaviour, friction and engine lubricant to investigate the performance of a 2.0l, I4 GTDI spark ignition engine and in particular, how these influence fuel consumption over the NEDC. Core parts of PROMETS include a physics-based, empirically calibrated friction model, a cycle averaged description of gas-to-structure heat transfer and a lumped capacity description of thermal behaviour of the engine block and cylinder head. In the thesis, revisions to the description of friction and interactions between friction, local thermal conditions and lubricant are reported. It is shown that the bulk temperature of coolant rather than oil has the stronger influence on friction at the piston-liner interface, whilst bulk oil temperature more strongly influences friction in crankshaft bearings and other lower engine components. However, local oil film temperatures have a direct influence on local friction contribution. To account for this, local values of oil temperature and viscosity are used in describing local friction contributions. Implementation required an oil system model to be developed; an iterative model of the frictional dissipation within the main bearings, and a prediction of piston cooling jet heat transfer coefficients have been added to the oil circuit. Simulations of a range of scenarios and design changes are presented and analysed in the thesis. The size of the fuel savings that could potentially be made through improved thermal management has been demonstrated to be 4.5% for the engine being simulated. Model results show that of the friction contributing surfaces, the piston group is responsible for the highest levels of friction, and also exhibits the largest absolute reduction in friction as the temperature of the engine rises. The relatively low warm-up rate of the lower engine structure gives a correspondingly slow reduction in friction in crankshaft bearings from their cold start values. Measures to accelerate this reduction by raising oil temperature have limited effect unless the strong thermal links between the oil and the surrounding metal are broken. When additional heating is applied to the engine oil, only around 30% is retained to raise the oil temperature due to these thermal links.
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Книги з теми "Thermal losse"

1

Church, Ronald H. Dielectric properties of low-loss minerals. [Pittsburgh]: U.S. Dept. of the Interior, 1988.

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2

Church, Ronald H. Dielectric properties of low-loss minerals. Washington, DC: U.S. Bureau of Mines, 1988.

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3

Davis, Bob. Manufactured homes acquisition program: Heat loss assumptions, calculations, and heat loss coefficient tables. Seattle, WA: Ecotope, Inc., 1992.

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4

A, Naff S., U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Systems Research., Idaho National Engineering Laboratory, and EG & G Idaho., eds. Thermal-hydraulic processes during reduced inventory operation with loss of residual heat removal. Washington, DC: Division of Systems Research, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1992.

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5

A, Naff S., U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Systems Research., Idaho National Engineering Laboratory, and EG & G Idaho., eds. Thermal-hydraulic processes during reduced inventory operation with loss of residual heat removal. Washington, DC: Division of Systems Research, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1992.

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6

Onega, Ronald J. Thermal flanking loss calculations for the National Bureau of Standards calibrated hot box. [Washington, DC]: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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7

Boyd, Christopher Fred. Predictions of spent fuel heatup after a complete loss of spent fuel pool coolant. Washington, DC: Safety Margins and Systems Analysis Branch, Office of Nuclear Regulatory Research, Nuclear Regulatory Commission, 2000.

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8

Boyd, Christopher F. Predictions of spent fuel heatup after a complete loss of spent fuel pool coolant. Washington, DC: Safety Margins and Systems Analysis Branch, Office of Nuclear Regulatory Research, Nuclear Regulatory Commission, 2000.

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9

Center, Lewis Research, ed. Adjusting measured weight loss of aged graphite fabric/PMR-15 composites. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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10

Vahe, Petrosian, and United States. National Aeronautics and Space Administration., eds. The behavior of beams of relativistic non-thermal electrons under the influence of collisions and synchrotron losses. Stanford, Calif: Center for Space Science and Astrophysics, Stanford University, 1990.

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Частини книг з теми "Thermal losse"

1

Andersson, Mats, Heinz Jacobs, Ricardo Carmona, Clifford S. Selvage, Pierre Wattiez, Antonio Cuadrado, Sevillana, T. van Steenberghe, John J. Kraabel, and F. Gaus. "Thermal Losses/Thermal Inertia." In The IEA/SSPS Solar Thermal Power Plants — Facts and Figures — Final Report of the International Test and Evaluation Team (ITET), 429–587. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82678-8_6.

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2

Smith, D. C. "Evaluation of Individual Thermal Losses." In Solar Thermal Central Receiver Systems, 95–121. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88196-1_6.

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3

Carmona, R., M. Sánchez, and H. Jacobs. "Evaluation of Advanced Sodium Receiver Losses." In Solar Thermal Central Receiver Systems, 259–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82910-9_19.

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Bonduelle, B., and A. M. Cazin-Bourguignon. "Themis Receiver: Thermal Losses and Performance." In Solar Thermal Central Receiver Systems, 273–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82910-9_20.

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Martín, José G., Ricardo Carraona, Heinz Jacobs, Mats Andersson, and Pierre Wattiez. "Survey of Plant Losses." In The IEA/SSPS Solar Thermal Power Plants, 153–268. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82680-1_4.

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6

Jacobs, Heinz, and Ricardo Carmona. "Thermal Losses of the Collector Fields." In The IEA/SSPS Solar Thermal Power Plants — Facts and Figures— Final Report of the International Test and Evaluation Team (ITET), 97. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82684-9_40.

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7

El Hefni, Baligh, and Daniel Bouskela. "Pressure Loss Modeling." In Modeling and Simulation of Thermal Power Plants with ThermoSysPro, 331–81. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05105-1_13.

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Ochkov, Valery, and Konstantin Orlov. "Calculation of Pressure Losses in the Tube." In Thermal Engineering Studies with Excel, Mathcad and Internet, 199–218. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26674-9_16.

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Špelić, Ivana, Alka Mihelić-Bogdanić, and Anica Hursa Šajatović. "Modelling Heat Losses from the Human Body." In Standard Methods for Thermal Comfort Assessment of Clothing, 43–82. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, 2018.: CRC Press, 2019. http://dx.doi.org/10.1201/9780429422997-3.

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Martín, José G., and Ricardo Carmona. "Optical Losses." In The IEA/SSPS Solar Thermal Power Plants — Facts and Figures— Final Report of the International Test and Evaluation Team (ITET), 96. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82684-9_39.

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Тези доповідей конференцій з теми "Thermal losse"

1

Burkholder, Frank, Michael Brandemuehl, Henry Price, Judy Netter, Chuck Kutscher, and Ed Wolfrum. "Parabolic Trough Receiver Thermal Testing." In ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36129.

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NREL has fabricated a parabolic trough receiver thermal loss test stand to quantify parabolic receiver off-sun steadystate heat loss. At an operating temperature of 400°C, measurements on Solel UVAC2 and Schott PTR70 receivers suggest off-sun thermal losses of approximately 370 W/m receiver length. For comparison, a receiver from the field with hydrogen in its annulus loses approximately 1000 W/m receiver length. The UVAC2 heat loss results agree within measurement uncertainty to previously published data, while the PTR70 results are somewhat higher than previously published data. The sensitivity of several receiver performance parameters is considered and it is concluded that differences in indoor and outdoor testing cannot account for the difference in PTR70 thermal loss results.
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2

DEHN, SUSANNE, ERIK RASMUSSEN, and CRISPIN ALLEN. "Round Robin Test of Thermal Conductivity for a Loose Fill Thermal Insulation Product in Europe." In Thermal Conductivity 33/Thermal Expansion 21. Lancaster, PA: DEStech Publications, Inc., 2019. http://dx.doi.org/10.12783/tc33-te21/30337.

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Ruiz, Maritza, and Van P. Carey. "An Exergy-Based Metric for Evaluating Solar Thermal Absorber Technologies for Gas Heating." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44354.

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The energy conversion effectiveness of the central receiver absorber in concentrating solar thermal power systems is dictated primarily by heat losses, material temperature limits, and pumping power losses. To deliver concentrated solar energy to a gas for process heat applications or gas cycle power generation, there are a wide variety of compact heat exchanger finned surfaces that could be used to enhance the convective transfer of absorbed solar energy to the gas stream flowing through the absorber. In such circumstances, a key design objective for the absorber is to maximize the heat transfer thermodynamic performance while minimizing the pumping power necessary to drive the gas flow through the fin matrix. This paper explores the use of different performance metrics to quantify the combined heat transfer, thermodynamic and pressure loss effectiveness of enhanced fins surfaces used in solar thermal absorbers for gas heating. Previously defined heat exchanger performance metrics, such as the “goodness factor”, are considered, and we develop and explore the use of a new metric, the “loss factor”, for determining the preferred enhanced fin matrix surfaces for concentrated solar absorbers. The loss factor, defined as the normalized exergy loss in the receiver, can be used for nondimensional analysis of the desirable qualities in an optimized solar receiver design. In comparison to previous goodness factor methods, the loss factor metric has the advantage that it quantifies the trade-off between trying to maximize the solar exergy transferred to the gas (high heat transfer rate and delivery at high temperature) and minimizing the pumping exergy loss. In this study, the loss factor is used to compare current solar receiver designs, and designs that use a variety of available plate-finned compact heat transfer surfaces with known Colburn factor (j) and friction factor (f) characteristics. These examples demonstrate how the loss factor metric can be used to design and optimize novel solar central receiver systems, and they indicate fin matrix surfaces that are particularly attractive for this type of application.
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4

Nogueira, Vinicius, and Rogério Gonçalves dos Santos. "Head Loss Optimization." In Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2018. http://dx.doi.org/10.26678/abcm.encit2018.cit18-0692.

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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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Peiman, Wargha, Kamiel Gabriel, and Igor Pioro. "Thermal Design Options of New Pressure Channel for SCWRs." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75514.

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This paper focuses on thermal-design options of a new pressure channel for SuperCritical Water-cooled Reactors (SCWRs). The objectives of this paper are to estimate heat losses from the coolant to the moderator for a preliminary fuel-channel design and to investigate effects of the insulator thickness and moderator pressure on the overall heat losses. In order to fulfill the objectives, the heat losses for an existing reactor were calculated and compared with available values from open literature. These calculations became the basis for calculation of the heat loss for the chosen new fuel-channel design. MATLAB, and NIST REFPROP software were utilized for programming and calculation of thermo-physical properties as needed, respectively. Heat losses for different thicknesses of the ceramic insulator were calculated. These calculations showed that the heat losses for the optimum thickness of insulator, which was calculated to be 7 mm, were about 31 MW. In current CANDU reactors the operating pressure of the moderator is close to the atmospheric pressure; higher operating pressures will allow operation of the moderator at higher temperature while preventing occurrence of boiling in the calandria vessel. Higher moderator temperatures will results in a lower temperature difference between the coolant and the moderator, hence reducing the heat sink from the coolant to the moderator. The effect of the moderator pressure on the heat loss was investigated, which showed that the heat loss can be reduced by increasing the operating pressure of the moderator by approximately 1 MW per 0.1 MPa increase in pressure.
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7

"Thermal, Losses and Efficiency Issues." In 2018 XIII International Conference on Electrical Machines (ICEM). IEEE, 2018. http://dx.doi.org/10.1109/icelmach.2018.8507185.

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8

Wheaton, L. D. "Measurement of Steam Injection Tubing Heat Losses Using Pressure/Temperature Survey Data." In SPE International Thermal Operations Symposium. Society of Petroleum Engineers, 1991. http://dx.doi.org/10.2118/21524-ms.

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9

Murphy, Thomas E., and Halil Berberoglu. "Transient Analysis of Microorganism Temperature and Evaporative Losses in an Algae Biofilm Photobioreactor." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44347.

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This study describes the thermal modeling of a novel algal biofilm photobioreactor aimed at cultivating algae for biofuel production. The thermal model is developed to assess the photo-bioreactor’s thermal profile and evaporative water loss rate for a range of environmental parameters, including relative humidity, ambient air temperature, solar irradiation, and wind speed. First, a 24 hour simulation of the system has been performed using environmental data for Memphis, TN, USA on a typical spring day to assess the diurnal variations in system performance. Then, a sensitivity analysis is performed to assess the effect of each environmental parameter on the temperature and evaporative losses of the photobioreactor. It is observed that because of the high surface area-to-volume ratio of the system, the temperature of the system exceeds that of the maximum ambient temperature during daylight hours by approximately 0.5 °C and is lower than the minimum ambient temperature at night by approximately 1.4 °C because of evaporative and radiative cooling. Furthermore, without active cooling, the characteristic evaporative water loss from the system is approximately 4.8 L/m2-day.
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10

Rottmund, M. E. "Low Thermal Loss Cryogenic Pump." In ADVANCES IN CRYOGENIC ENGEINEERING: Transactions of the Cryogenic Engineering Conference - CEC. AIP, 2004. http://dx.doi.org/10.1063/1.1774693.

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Звіти організацій з теми "Thermal losse"

1

Yahav, Shlomo, John McMurtry, and Isaac Plavnik. Thermotolerance Acquisition in Broiler Chickens by Temperature Conditioning Early in Life. United States Department of Agriculture, 1998. http://dx.doi.org/10.32747/1998.7580676.bard.

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The research on thermotolerance acquisition in broiler chickens by temperature conditioning early in life was focused on the following objectives: a. To determine the optimal timing and temperature for inducing the thermotolerance, conditioning processes and to define its duration during the first week of life in the broiler chick. b. To investigate the response of skeletal muscle tissue and the gastrointestinal tract to thermal conditioning. This objective was added during the research, to understand the mechanisms related to compensatory growth. c. To evaluate the effect of early thermo conditioning on thermoregulation (heat production and heat dissipation) during 3 phases: (1) conditioning, (2) compensatory growth, (3) heat challenge. d. To investigate how induction of improved thermotolerance impacts on metabolic fuel and the hormones regulating growth and metabolism. Recent decades have seen significant development in the genetic selection of the meat-type fowl (i.e., broiler chickens); leading to rapid growth and increased feed efficiency, providing the poultry industry with heavy chickens in relatively short growth periods. Such development necessitates parallel increases in the size of visceral systems such as the cardiovascular and the respiratory ones. However, inferior development of such major systems has led to a relatively low capability to balance energy expenditure under extreme conditions. Thus, acute exposure of chickens to extreme conditions (i.e., heat spells) has resulted in major economic losses. Birds are homeotherms, and as such, they are able to maintain their body temperature within a narrow range. To sustain thermal tolerance and avoid the deleterious consequences of thermal stresses, a direct response is elicited: the rapid thermal shock response - thermal conditioning. This technique of temperature conditioning takes advantage of the immaturity of the temperature regulation mechanism in young chicks during their first week of life. Development of this mechanism involves sympathetic neural activity, integration of thermal infom1ation in the hypothalamus, and buildup of the body-to-brain temperature difference, so that the potential for thermotolerance can be incorporated into the developing thermoregulation mechanisms. Thermal conditioning is a unique management tool, which most likely involves hypothalamic them1oregulatory threshold changes that enable chickens, within certain limits, to cope with acute exposure to unexpected hot spells. Short-tem1 exposure to heat stress during the first week of life (37.5+1°C; 70-80% rh; for 24 h at 3 days of age) resulted in growth retardation followed immediately by compensatory growth" which resulted in complete compensation for the loss of weight gain, so that the conditioned chickens achieved higher body weight than that of the controls at 42 days of age. The compensatory growth was partially explained by its dramatic positive effect on the proliferation of muscle satellite cells which are necessary for further muscle hypertrophy. By its significant effect of the morphology and functioning of the gastrointestinal tract during and after using thermal conditioning. The significant effect of thermal conditioning on the chicken thermoregulation was found to be associated with a reduction in heat production and evaporative heat loss, and with an increase in sensible heat loss. It was further accompanied by changes in hormones regulating growth and metabolism These physiological responses may result from possible alterations in PO/AH gene expression patterns (14-3-3e), suggesting a more efficient mechanism to cope with heat stress. Understanding the physiological mechanisms behind thermal conditioning step us forward to elucidate the molecular mechanism behind the PO/AH response, and response of other major organs. The thermal conditioning technique is used now in many countries including Israel, South Korea, Australia, France" Ecuador, China and some places in the USA. The improvement in growth perfom1ance (50-190 g/chicken) and thermotolerance as a result of postnatal thermal conditioning, may initiate a dramatic improvement in the economy of broiler's production.
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2

Coppi, B., and W. M. Tang. Influence of anomalous thermal losses of ignition conditions. Office of Scientific and Technical Information (OSTI), May 1986. http://dx.doi.org/10.2172/5628660.

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3

Boehm, R. F. Review of thermal loss evaluations of solar central receivers. Office of Scientific and Technical Information (OSTI), April 1986. http://dx.doi.org/10.2172/5751558.

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4

Graves, R. S., K. E. Wilkes, and D. L. McElroy. Thermal resistance of attic loose-fill insulations decreases under simulated winter conditions. Office of Scientific and Technical Information (OSTI), May 1994. http://dx.doi.org/10.2172/10155056.

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5

Madrzykowski, aniel, Craig Weinschenk, and Joseph Willi. Exposing Fire Service Hose in a Flashover Chamber. UL's Fire Safety Research Institute, April 2018. http://dx.doi.org/10.54206/102376/tkog7594.

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At the request of the Fire Department City of New York (FDNY), UL’s Fire Safety Research Institute (FSRI) instrumented and documented a series of 12 thermal exposure hose experiments that were conducted in the burn compartment of an FDNY flashover simulator. The main objective of the experiments was to observe the performance of fire hoses exposed to the heat flux from flaming hot gas layer conditions above the hose. FDNY collected a variety of hose types that represented a cross section of commercially available materials and construction methods. The thermal exposures generated in the burn compartment were measured. The fire experiments were stopped once the hose being examined began to lose water through the wall of the hose. All of the hoses lost water through their wall, although the size of the holes and the amount of water leakage varied. While the burn compartment provided a “fire room environment” and different types of hose failures were demonstrated, the thermal exposure within the compartment was not demonstrated to be repeatable. Therefore it is not possible to develop a comparable rank or rating of the fire resistance of these hoses from this series of experiments.
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6

Onega, R. J. Thermal flanking loss calculations for the National Bureau of Standards calibrated hot box. Gaithersburg, MD: National Bureau of Standards, 1985. http://dx.doi.org/10.6028/nbs.ir.83-2804.

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7

Naff, S., G. Johnsen, D. Palmrose, E. Hughes, C. Kullberg, and W. Arcieri. Thermal-hydraulic processes during reduced inventory operation with loss of residual heat removal. Office of Scientific and Technical Information (OSTI), April 1992. http://dx.doi.org/10.2172/5477891.

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Shapiro, C., A. Magee, and W. Zoeller. Reducing Thermal Losses and Gains With Buried and Encapsulated Ducts in Hot-Humid Climates. Office of Scientific and Technical Information (OSTI), February 2013. http://dx.doi.org/10.2172/1219917.

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Shapiro, Carl, A. Magee, and W. Zoeller. Reducing Thermal Losses and Gains With Buried and Encapsulated Ducts in Hot-Humid Climates. Office of Scientific and Technical Information (OSTI), February 2013. http://dx.doi.org/10.2172/1067903.

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Fletcher, C. D., P. R. McHugh, S. A. Naff, and G. W. Johnsen. Thermal-hydraulic processes involved in loss of residual heat removal during reduced inventory operation. Office of Scientific and Technical Information (OSTI), February 1991. http://dx.doi.org/10.2172/6367739.

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