ΕΠΙΣΤΡΟΦΗ ΣΤΗΝ ΑΡΧΙΚΗ ΣΕΛΙΔΑ

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Στο CERN στη Library Catalogue containing δίνοντας ''heat + transport '' πήραμε 52 καταχωρήσεις τις πιο ενδιαφέρουσες τις παραθέτουμε παρακάτω.

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11. (gr-qc/9710135) . Inflation driven by causal heat flux . by Maartens, R ; Govender, M ; Maharaj, S ; Publ. Ref.: Subm. to Gen. Relativ. Gravit. . (5 p) . 1997 . - Access to fulltext document - More information - Mark document -

We find a simple inflationary solution in an inhomogeneous spacetime with heat flux. The heat flux obeys a causal transport equation, and counteracts the inflationary decrease of energy density. At late times, the heat flux tends to zero and the fluid approaches the equation of state $p=-\rho$.

Report number(s):
Category: CA GENERAL RELATIVITY AND COSMOLOGY
Electronic mail: "Roy Maartens"

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12. LHC-Project-Report-144 . (CERN-LHC-PROJECT-REPORT-144) . Cooling Strings of Superconducting Devices below 2 K: the Helium II Bayonet Heat Exchanger . by Lebrun, P ; Serio, L ; Tavian, L ; van Weelderen, R ; . Subm. to:Cryogenic Engineering Conference and International Cryogenic Materials Conference : CEC/ICMC '97 Portland, OR ; 27 Jul - 1 Aug 1997 . Publ. in: Proceedings . (9 p) . 1997 . - Access to fulltext document - More information - Mark document -

High-energy particle accelerators and colliders contain long strings of superconducting devices - acceleration RF cavities and magnets - operating at high field, which may require cooling in helium II below 2 K. In order to maintain adequate operating conditions, the applied or generated heat loads must be extracted and transported with minimum temperature difference. Conventional cooling schemes based on conductive or convective heat transport in pressurized helium II very soon reach their intrinsic limits of thermal impedance over extended lengths. We present the concept of helium II bayonet heat exchanger, which has been developed at CERN for the magnet cooling scheme of the Large Hadron Collider (LHC), and describe its specific advantages as a slim, quasi-isothermal heat sink. Experimental results obtained on several test set-ups, and a prototype magnet string have permitted to validate its performance and sizing rules, for transporting linear heat loads in the W.m-1 range over distances of several tens of meters.

Report number(s): LHC-PROJECT-REPORT-144
Category: EE ACCELERATORS AND STORAGE RINGS
Electronic mail: no mail available

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13. (astro-ph/9710108) . X-ray emission, optical nebulosity and dust in early-type galaxies; 1, The dusty nebular filaments in NGC 5846 . by Goudfrooij, P ; Trinchieri, G ; Publ. Ref.: Subm. to Astron. Astrophys. . (14 p) . 1997 . - Access to fulltext document - More information -

We present new optical imagery of the X-ray bright elliptical galaxy NGC 5846, the dominant galaxy of a small group of galaxies. A dust lane with a dust mass of 7 10^3 Msun is detected in the central few kpc of NGC 5846. The morphology of the dust features are strikingly similar to that observed for the optical nebulosity AND the X-ray emission. A physical connection between the different phases of the interstellar medium therefore seems likely. We discuss three different options for the origin of the dusty nebular filaments: Condensation out of a cooling flow, mass loss of late-type stars within NGC 5846, and material donated by a small neighbouring galaxy. We conclude that the dust as well as the optical nebulosity are most likely products of a recent interaction with a small, relatively gas-rich galaxy, probably of Magellanic type. Dust grains in the dust lane are destroyed by sputtering in the hot, X-ray-emitting gas in less than about 10^7 yr, which is shorter than the crossing time of a (small) galaxy through the central 5 kpc of NGC 5846. We argue that the dust is replenished by evaporation of cool, dense gas cloudlets that were brought in during the interaction. The evaporation rate of cool gas in NGC 5846, 0.001 solar mass per year, is consistent with the "mass deposition rate" derived from X-ray measurements. The energy lost by the hot gas through heating of dust and evaporation of cool gas clouds in the central few kpc of NGC 5846 is adequately balanced by heat sources: transport of heat by electron conduction and loss of kinetic energy of the in-falling galaxy. There does not seem to be a need to invoke the presence of a "cooling flow" to explain the X-ray and optical data.

Report number(s):
Category: JA ASTROPHYSICS AND ASTRONOMY
Electronic mail: Paul Goudfrooij

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17. LHC-Project-Report-125 . (CERN-LHC-PROJECT-REPORT-125) . Superfluid helium as a technical coolant . by Lebrun, P ; . Subm. to: 15th UIT National Heat Transfer Conference Turin, Italy ; 19 - 20 Jun 1997 . Publ. in: Proceedings . (16 p) . 1997 . - Access to fulltext document - More information - Mark document -

The characteristics of superfluid helium as a technical coolant, which derive from its specific transport properties, are presented with particular reference to the working area in the phase diagram (saturated or pressurised helium II). We then review the principles and scaling laws of heat transport by equivalent conduction and by forced convection in pressurised helium II, thus revealing intrinsic limitations as well as technological shortcomings of these cooling methods. Once properly implemented, two-phase flow of saturated helium II presents overwhelming advantages over the previous solutions, which dictated its choice for cooling below 1.9 K the long strings of superconducting magnets in the Large Hadron Collider (LHC), a 26.7 km circumference particle collider now under construction at CERN, the European Laboratory for Particle Physics near Geneva (Switzerland). We report on recent results from the ongoing research and development programme conducted on thermohydraulics of two-phase saturated helium II flows, and on the validation of design choices for the LHC cooling system.

Report number(s): LHC-PROJECT-REPORT-125
Category: EE ACCELERATORS AND STORAGE RINGS
Electronic mail: no mail available

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Στο CERN πάλι δίνοντας το πιο εξειδικευμένο''heat AND phonon '' πήραμε 13 καταχωρήσεις μερικές που θεωρήσαμε πιο ενδιαφέρουσες, περιλήψεις, παραθέτουμε παρακάτω

1. CMP-001 . (cond-mat/9801252) . Heat Transport in Mesoscopic Systems . by Angelescu, D E ; Cross, M C ; Roukes, M L ; Publ. Ref.: Subm. to Superlattices Microstruct. . 1998 . - Access to fulltext document - More information - Mark document -

Preprint CMP-001 (cond-mat/9801252)

Heat Transport in Mesoscopic Systems

by: Angelescu, D E ; Cross, M C ; Roukes, M L ;

• Email: Michael Cross mcc@caltech.edu
• Publ. Ref.: Subm. to Superlattices Microstruct.
• Imprint: 26 Jan 1998
• Subjects: Condensed Matter

Abstract:Phonon heat transport in mesoscopic systems is investigated using methods analogous to the Landauer description of electrical conductance. A "universal heat conductance" expression that depends on the properties of the conducting pathway only through the mode cutoff frequencies is derived. Corrections due to reflections at the junction between the thermal body and the conducting bridge are found to be small except at very low temperatures where only the lowest few bridge modes are excited. Various non-equilibrium phonon distributions are studied: a narrow band distribution leads to clear steps in the cooling curve, analogous to the quantized resistance values in narrow wires, but a thermal distribution is too broad to show such features.

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2. CNS-9721 . (cond-mat/9712064) . Heat conduction in one dimensional chains . by Hu, B ; Li, B ; Zhao, H ; Publ. Ref.: Subm. to Phys. Rev., E . (4 p) . 1997 . - Access to fulltext document - More information - Mark document -

Preprint CNS-9721 (cond-mat/9712064)

Heat conduction in one dimensional chains

by: Hu, B ; Li, B ; Zhao, H ;

• Email: bwli@phchaos.hkbu.edu.hk
• Affiliations: Centre for Nonlinear Studies and Department of Physics, Hong Kong Baptist University, China
• Publ. Ref.: Subm. to Phys. Rev., E
• Imprint: 8 Dec 1997 4 p
• Subjects: Condensed Matter

Abstract:We study numerically the thermal conductivity in several different one dimensional chains. We show that the phonon-lattice interaction is the main ingredient of the Fourier heat law. Our argument provides a rather satisfactory explanation to all existing numerical results concerning this problem.

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3. (cond-mat/9712047) . Stripe Correlations of Spins and Holes and Phonon Heat Transport in Doped $La_{2}CuO_{4}$ . by Baberski, O ; Lang, A ; Maldonado, O ; H?cker, M ; B?chner, B ; Freimuth, A ; Publ. Ref.: Subm. to Europhys. Lett. . (8 p) . 1997 . - Access to fulltext document - More information - Mark document -

Preprint (cond-mat/9712047)

Stripe Correlations of Spins and Holes and Phonon Heat Transport in Doped $La_{2}CuO_{4}$

by: Baberski, O ; Lang, A ; Maldonado, O ; H?cker, M ; B?chner, B ; Freimuth, A ;

• Email: Markus Huecker marker@colorix.ph2.uni-koeln.de
• Affiliations: II. Physikalisches Institut, Universitdt zu Kfln, Germany ; Physikalisches Institut, Universitdt Karlsruhe, Germany
• Publ. Ref.: Subm. to Europhys. Lett.
• Imprint: 4 Dec 1997 8 p
• Subjects: Condensed Matter

Abstract:We present experimental evidence for a dramatic suppression of the phononic thermal conductivity of rare earth and Sr doped La_2CuO_4. Remarkably, this suppression correlates with the occurrence of superconductivity. Conventional models for the phonon heat transport fail to explain these results. In contrast, a straightforward explanation is possible in terms of static and dynamic stripe correlations of holes and spins.

document - More information - Mark document -

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4. (cond-mat/9605152) . Electron and phonon thermal waves in semiconductors: an application to photothermal effects . by De la Cruz, G G ; Gurevich, Yu G ; (12 p) . 1996 . - Access to fulltext document - More information - Mark document -

Preprint (cond-mat/9605152)

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• Email: Yury Gurevich Yury.Gurevich@fis.cinvestav.mx
• Imprint: 23 May 1996 12 p
• Subjects: Condensed Matter

Abstract:The electron and phonon temperature distribution function are calculated in semiconductors. We solved the coupled one-dimensional heat-diffussion equations in the linear approximation in which the physical parameters on the sample are independent of the temperature. We also consider the heat flux at the surface of the semiconductor as a boundary condition for each electron and phonon systems instead of using a fixed temperature. From this, we obtain an expression for electron and phonon temperature respectively. The characterization of the thermal waves properties is duscussed and some practical procedures for this purpose provide us information about the electron and phonon thermal parameters.

Στη Library of Congress ''heat + transport '' πήραμε 74 καταχωρήσεις που παρατίθενται παρακάτω.και διακρίνονται στις εξής κατηγορίες:

10	tems containing the words heat + transport next to each other in order.
24	Items containing the words heat + transport near each other.
40	Items containing all of the words: heat + transport, but not near each other

Go to Search Results:

Από αυτές θεωρήσαμε πιο ενδιαφέρουσες τις παρακάτω :

1	Heat transport systems and components for space nuclear power : presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, San Francisco, California, December 10-15, 1989 1989 sponsored by the Nuclear Heat Exchanger Committee of the Nuclear Engineering Division, ASME : edited by Y.A. Hassan. [TL1102.N8 A47 1989 ]
2	Exact solution of the radiation heat transport equation in a gas-filled spherical cavity 1970 [by] E. C. Gritton and A. Leonard. [Q180.A1 R36 no. 6175 QC175.2 ]
3	Nuclear energy conversion 1978 M. M. El-Wakil. [TK9202 .E46 1978 ]
Items containing the words heat + transport near each other.
1	Transport phenomena in heat and mass transfer : proceedings of the Fourth International Symposium on Transport Phenomena in Heat and Mass Transfer (ISTP-IV), Sydney, Australia, 14-19 July, 1991, organized under the auspices of the Pacific Center of Thermal-Fluids Engineering 1992 edited by J.A. Reizes. [QC319.8 .I59 1991 ]
2	Transport phenomena 1975 W. J. Beek and K. M. K. Muttzall. [QC175.2 .B4 ]
3	Nonequilibrium interfacial transport processes : presented at the 18th National Heat Transfer Conference, San Diego, California, August 6-8, 1979 1979 sponsored by the Heat Transfer Division, ASME and the Heat Transfer and Energy Conversion Division, AIChE ; edited by J. C. Chen, S. G. Bankoff. [QC319.8 .N66 ]
4	Transport phenomena and materials processing 1996 Sindo Kou. [TS183 .K68 1996 ]
5	PC-aided numerical heat transfer and convective flow 1995 Akira Nakayama. [QC151 .N25 1995 ]
6	Proceedings of the ASME Heat Transfer Division : presented at the 1995 ASME International Mechanical Engineering Congress and Exposition, November 12-17, 1995, San Francisco, California 1995 sponsored by the Heat Transfer Division, ASME. [TJ260 .P7642 1995 ]
7	Transport processes : momentum, heat, and mass 1983 Christie J. Geankoplis. [TP156.T7 G425 1983 ]
8	Vacancy jump rate and heat of transport in a simple crystal model. 1971 Ellenbogen, Jon David. [QD931 .E44 ]
9	Stochastic processes in heat and mass transport 1972 [by] Vincent A. LoDato. [AS36 .R28 no. 4756 QC320 ]
10	Biomedical engineering principles : an introduction to fluid, heat, and mass transport processes 1976 David O. Cooney. [R856 .C63 ]
11	Convective heat transfer and transport process, 1991 : presented at the 28th National Heat Transfer Conference, Minneapolis, Minnesota, July 28-31, 1991 1991 edited by Adrienne G. Lavine, Michael K. Jensen, M. Ali Ebadian ; sponsored by the Heat Transfer Division, ASME. [TJ260 .C64 1991 ]
12	Nonequilibrium transport phenomena : presented at the 24th National Heat Transfer Conference and Exhibition, Pittsburgh, Pennsylvania, August 9-12, 1987 1987 sponsored by the Nucleonics Committee, Heat Transfer Division, ASME, and the Nuclear Heat Transfer Committee, Heat Transfer and Energy Conversion Division, AIChE ; edited by F. Dobran ... [et al.]. [TJ260 .N36 1987c ]
Items containing all of the words: heat + transport, but not near each other.
1	Transport phenomena in materials processing and manufacturing : presented at the 28th National Heat Transfer Conference and Exhibition, San Diego, California, August 9-12, 1992. 1992 sponsored by the Heat Transfer Division, ASME ; edited by M. Charmchi ... [et al.]. [TS183 .T74 1992 ]
2	Transport phenomena in materials processing and manufacturing, 1994 : presented at the 6th AIAA/ASME Thermophysics and Heat Transfer Conference, Colorado Springs, Colorado, June 20-30, 1994 1994 sponsored by the Heat Transfer Division, ASME ; edited by M.K. Alam ... [et al.]. [TS183 .T737 1994 ]
3	Transport phenomena in material processing : presented at AIAA/ASME Thermophysics and Heat Transfer Conference, June 18-20, 1990, Seattle, Washington 1990 sponsored by the Heat Transfer Division, ASME ; edited by M. Charmichi ... [et al.]. [TS213 .T72 1990 ]
4	Transport phenomena in materials processing and manufacturing, 1996 : presented at the 1996 International Mechanical Engineering Congress and Exposition, November 17-22, 1996, Atlanta, Georgia 1996 sponsored by the Heat Transfer Division, ASME [and] the Fluids Engineering Division, ASME ; edited by A.S. Levine ... [et al.]. [TS183 .T738 1996 ]
5	Fission product transport processes in reactor accidents 1990 edited by J.T. Rogers. [TK9153 .F57 1990 ]
6	Two-phase transport & reactor safety : proceedings of the Two-Phase Flow and Heat Transfer Symposium-Workshop, held in Fort Lauderdale, Florida, on 18-20 October 1976, [and presented by the Clean Energy Research Institute, University of Miami, Coral Gables, Florida] 1978 edited by T.N. Veziroglu, S. Kakaη ; [sponsored by the National Science Foundation, Washington, D.C., and the School of Continuing Studies, University of Miami]. [TA357 .T95 1976 ]
7	Kinetic theory 1965 [by] S.G. Brush. [QC175 .B895 ]
8	Film models for transport phenomena with fog formation : with application to plastic exchangers and condensers 1990 door Henricus Jozef Hubertus Brouwers. [TJ263 .B76 1990 ]
9	Computational techniques in transient and turbulent flow 1981 edited by C. Taylor and K. Morgan. [TA357 .R36 vol. 2 ]
10	Multiphase transport and particulate phenomena 1990 edited by T. Nejat Veziroglu. [TA357 .M85 1990 ]
11	Transport phenomena in rotating machinery : proceedngs of the Second International Symposium on Transport Phenomena, Dynamics, and Design of Rotating Machinery, part 1 1990 edited by J.H. Kim, W.-J. Yang. [TJ1058 .I57 1990a ]
12	Transport phenomena in materials processing 1983 presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, Boston, Massachusetts, November 13-18, 1983 ; sponsored by Committee K-8, the Heat Transfer Division and the Production Engineering Division, ASME ; edited by Michael M. Chen, Jyotirmoy Mazumder, Charles L. Tucker III. [TS213 .T73 1983 ]
13	Convective transport : presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, Boston, Massachusetts, December 13-18, 1987 1987 sponsored by the General Papers Committee, the Heat Transfer Division, ASME ; edited by Y. Jaluria, R.S. Figliola, M. Kaviany. [TJ260 .A415 1987b ]
14	Momentum, heat and mass transfer to a moving continuous cylinder. 1969 Rotte, Joost Willem. [QC151 .R59 ]
15	Biomedical applications of heat and mass transfer 1971 [by] R. C. Seagrave. [QP88 .S4 ]
16	An introduction to transport phenomena in materials engineering 1992 David R. Gaskell. [TA418.5 .G37 1992 ]
17	Numerical simulations of heat transfer and fluid flow on a personal computer : incorporating simulation programs on diskette 1993 Susumu Kotake, Kunio Hijikata ; translated by Toru Fuseji. [TJ260 .K635 1993 ]
18	Transport processes in boiling and two-phase systems, including near-critical fluids 1986 Yih-Yun Hsu, Robert W. Graham. [QC145.2 .H78 1986 ]
19	Transport properties of oxygen 1983 prepared for NASA Lewis Research Center [by] H.M. Roder. [TP245.O9 R58 1983 ]
20	Transport phenomena in atmospheric and ecological systems. 1967 American Society of Mechanical Engineers. [GB690 .A45 ]
21	Thermal flow in porous media 1987 Horia I. Ene and Dan Polisevski. [QC155 .E54 1987 ]
22	Thermische und radiologische Auslegung des Transport- und Einlagerungsbehδlters Asse TB1 1985 W. Kessels ... [et al.]. [German] [TD898 .T49 1985 ]
13	Measurement of the transport properties of fluids 1991 edited by W.A. Wakeham, A. Nagashima, J.V. Sengers. [QC311 .M36 1991 ]

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