New Books

Concert Halls and Opera Houses: Music, Acoustics, and Architecture. 2nd ed. L. Beranek. Springer-Verlag, New York, 2004 [1996]. $69.00 (661 pp.). ISBN 0-387-95524-0

Accretion Discs, Jets and High Energy Phenomena in Astrophysics . V. Beskin, G. Henri, F. Menard, G. Pelletier, J. Dalibard, eds. NATO Advanced Study Institute. Proc. sch., Grenoble, France, July–Aug. 2002. EDP Sciences, Paris, and Springer-Verlag, New York, 2003. $159.00 (625 pp.). ISBN 2-86883-702-6 (EDP Sciences), ISBN 3-540-20171-8 (Springer-Verlag)

Advanced Astrophysics . N. Duric. Cambridge U. Press, New York, 2004. $110.00, $60.00 paper (296 pp.). ISBN 0-521-81967-9, ISBN 0-521-52571-3 paper

Astronomy Methods: A Physical Approach to Astronomical Observations . H. Bradt. Cambridge U. Press, New York, 2004. $110.00, $60.00 paper (433 pp.). ISBN 0-521-36440-X, ISBN 0-521-53551-4 paper

Astrophysics Update. J. W. Mason, ed. Springer-Praxis Books in Astrophysics and Astronomy. Praxis/Springer-Verlag, New York, 2004. $119.00 (314 pp.). ISBN 3-540-40642-5

High Energy Processes and Phenomena in Astrophysics . X. D. Li, V. Trimble, Z. R. Wang, eds. International Astronomical Union Symposium 214. Proc. symp., Suzhou, China, Aug. 2002. International Astronomical Union, Paris, and Astronomical Society of the Pacific, San Francisco, 2003. $95.00 (427 pp.). ISBN 1-58381-157-5

Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes . C. Crossen, G. Rhemann. Springer-Verlag, New York, 2004. $69.95 (279 pp.). ISBN 3-211-00851-9

Symbiotic Stars Probing Stellar Evolution . R. L. M. Corradi, J. Mikolajewska, T. J. Mahoney, eds. Astronomical Society of the Pacific Conference Series 303. Proc. conf., La Palma, Spain, May 2002. Astronomical Society of the Pacific, San Francisco, 2003. $57.00 (564 pp.). ISBN 1-58381-152-4

Atom Tunneling Phenomena in Physics, Chemistry and Biology. T. Miyazaki, ed. Springer Series on Atomic, Optical, and Plasma Physics 36. Springer-Verlag, New York, 2004. $119.00 (313 pp.). ISBN 3-540-01526-4

Atomic Physics: An Exploration Through Problems and Solutions. D. Budker, D. F. Kimball, D. P. DeMille. Oxford U. Press, New York, 2004. $99.50, $49.50 paper (441 pp.). ISBN 0-19-850949-9, ISBN 0-19-850950-2 paper

Dynamical Theory of X-ray Diffraction . A. Authier. IUCr Monographs on Crystallography 11. Oxford U. Press, New York, 2004 [2002, reissued]. $89.50 paper (674 pp.). ISBN 0-19-852892-2

Principles of Quantum Scattering Theory . D. Belkić. Series in Atomic and Molecular Physics . IOP, Philadelphia, 2004. $120.00 (371 pp.). ISBN 0-7503-0496-0

Quantum Squeezing. P. D. Drummond, Z. Ficek, eds. Springer Series on Atomic, Optical, and Plasma Physics 27. Springer-Verlag, New York, 2004. $89.95 (370 pp.). ISBN 3-540-65989-7

Biomicroelectromechanical Systems (BioMEMS) . C. S. Ozkan, J. T. Santini, H. Gao, G. Bao, eds. Materials Research Society Symposium Proceedings 773. Proc. symp., San Francisco, Apr. 2003. MRS, Warrendale, PA, 2003. $99.00 (187 pp.). ISBN 1-55899-710-5

Biomineralization . P. M. Dove, J. J. De Yoreo, S. Weiner, eds. Reviews in Mineralogy and Geochemistry 54. Geochemical Society, St. Louis, MO, and Mineralogical Society of America, Washington, DC, 2003. $36.00 paper (381 pp.). ISBN 0-9399-5066-9

Physics in Nuclear Medicine. 3rd ed. S. R. Cherry, J. A. Sorenson, M. E. Phelps. Saunders, Philadelphia, 2003 [1987]. $79.95 (523 pp.). ISBN 0-7216-8341-X

Basic Principles in Applied Catalysis . M. Baerns, ed. Springer Series in Chemical Physics 75. Springer-Verlag, New York, 2004. $189.00 (557 pp.). ISBN 3-540-44135-2

Organic Reaction Mechanisms: 40 Solved Cases. M. G. Gallego, M. A. Sierra. Springer-Verlag, New York, 2004. $54.95 (290 pp.). ISBN 3-540-00352-5

Advanced Excel^® for Scientific Data Analysis . R. de Levie. Oxford U. Press, New York, 2004. $85.00, $45.00 paper (615 pp.). ISBN 0-19-517089-X, ISBN 0-19-515275-1 paper

Applications and Science in Soft Computing. A. Lotfi, J. Garibaldi, eds. Advances in Soft Computing. Springer-Verlag, New York, 2004. $169.00 paper (346 pp.). ISBN 3-540-40856-8

Aspects of Molecular Computing: Essays Dedicated to Tom Head on the Occasion of His 70th Birthday. N. Jonoska, G. Paun, G. Rozenberg, eds. Lecture Notes in Computer Science 2950. Springer-Verlag, New York, 2004. $75.00 paper (389 pp.). ISBN 3-540-20781-3

Formal Methods at the Crossroads: From Panacea to Foundational Support. B. K. Aichernig, T. Maibaum, eds. Lecture Notes in Computer Science 2757. Proc. colloq., Lisbon, Portugal, March 2002. Springer-Verlag, New York, 2003. $74.00 paper (453 pp.). ISBN 3-540-20527-6

The Logic System of Concept Graphs With Negation: And Its Relationship to Predicate Logic. F. Dau. Lecture Notes in Artificial Intelligence 2892. Springer-Verlag, New York, 2003. $47.00 paper (213 pp.). ISBN 3-540-20607-8

Recent Trends in Algebraic Development Techniques. M. Wirsing, D. Pattinson, R. Hennicker, eds. Lecture Notes in Computer Science 2755. Proc. wksp., Frauenchiemsee, Germany, Sept. 2002. Springer-Verlag, New York, 2003. $75.00 paper (456 pp.). ISBN 3-540-20537-3

Turbulence Models and Their Application: Efficient Numerical Methods With Computer Programs. T. Cebeci. Horizons/Springer-Verlag, New York, 2004. $129.00 (118 pp.). ISBN 3-540-40288-8, CD-ROM

Electrodynamics of Magnetoactive Media. I. D. Vagner, B. I. Lembrikov, P. Wyder. Springer Series in Solid-State Sciences 135. Springer-Verlag, New York, 2004. $99.00 (422 pp.). ISBN 3-540-43694-4

Electronic Properties of Semiconductor Interfaces. W. Mönch. Springer Series in Surface Sciences 43. Springer-Verlag, New York, 2004. $139.00 (263 pp.). ISBN 3-540-20215-3

Excitons in Low-Dimensional Semiconductors: Theory, Numerical Methods, Applications. S. Glutsch. Springer Series in Solid-State Sciences 141. Springer-Verlag, New York, 2004. $119.00 (294 pp.). ISBN 3-540-20240-4

High-k Gate Dielectrics . M. Houssa, ed. Series in Materials Science and Engineering . IOP, Philadelphia, 2004. $120.00 (601 pp.). ISBN 0-7503-0906-7

Similarity in Diversity. S. Fujita, H. Hara, D. L. Morabito, Y. Okamura, eds. Proc. wksp., Niagara Falls, NY, May 2002. Nova Science, Hauppauge, NY, 2003. $89.00 (362 pp.). ISBN 1-59033-780-8

Single Quantum Dots: Fundamentals, Applications, and New Concepts. P. Michler, ed. Topics in Applied Physics 90. Springer-Verlag, New York, 2003. $199.00 (352 pp.). ISBN 3-540-14022-0

Vortex Electronics and SQUIDS . T. Kobayashi, H. Hayakawa, M. Tonouchi, eds. Topics in Applied Physics 91. Springer-Verlag, New York, 2003. $199.00 (302 pp.). ISBN 3-540-40231-4

X-ray Diffuse Scattering From Self-Organized Mesoscopic Semiconductor Structures . M. Schmidbauer. Springer Tracts in Modern Physics 199. Springer-Verlag, New York, 2004. $159.00 (202 pp.). ISBN 3-540-20179-3

Hall Effect Devices. 2nd ed. R. S. Popovic. Series in Sensors. IOP, Philadelphia, 2004 [1991]. $125.00 (419 pp.). ISBN 0-7503-0855-9

Silicon Microchannel Heat Sinks: Theories and Phenomena. L. Zhang, K. E. Goodson, T. W. Kenny. Microtechnology and MEMS . Springer-Verlag, New York, 2004. $99.00 (140 pp.). ISBN 3-540-40181-4

Annual Review of Environment and Resources. Vol. 28. P. A. Matson, A. Gadgil, D. M. Kammen, eds. Annual Reviews, Palo Alto, CA, 2003. $85.00 (665 pp.). ISBN 0-8243-2328-9

Humic Substances: Nature’s Most Versatile Materials . E. A. Ghabbour, G. Davies, eds. Taylor and Francis, New York, 2004. $110.00 (372 pp.). ISBN 0-59169-015-3

Out of Gas: The End of the Age of Oil . D. Goodstein. W. W. Norton, New York, 2004. $21.95 (140 pp.). ISBN 0-393-05857-3

Red Sky at Morning: America and the Crisis of the Global Environment. J. G. Speth. Yale U. Press, New Haven, CT, 2004. $24.00 (299 pp.). ISBN 0-300-10232-1

Three Mile Island: A Nuclear Crisis in Historical Perspective. J. S. Walker. U. of Calif. Press, Berkeley, 2004. $24.95 (303 pp.). ISBN 0-520-23940-7

Annual Review of Fluid Mechanics . Vol. 36. J. L. Lumley, S. H. Davis, P. Moin, eds. Annual Reviews, Palo Alto, CA, 2004. $74.00 (505 pp.). ISBN 0-8243-0736-4

Dynamics of Viscous Compressible Fluids. E. Feireisl. Oxford Lecture Series in Mathematics and Its Applications 26. Oxford U. Press, New York, 2004. $94.50 (212 pp.). ISBN 0-19-852838-8

A Gallery of Fluid Motion. M. Samimy, K. S. Breuer, L. G. Leal, P. H. Steen, eds. Cambridge U. Press, New York, 2003. $95.00, $35.00 paper (118 pp.). ISBN 0-521-82773-6, ISBN 0-521-53500-X paper

Interfacial Fluid Dynamics and Transport Processes . R. Narayanan, D. Schwabe, eds. Lecture Notes in Physics 628. Springer-Verlag, New York, 2003. $79.95 (367 pp.). ISBN 3-540-40583-6

Polymeric Liquids and Networks: Structure and Properties . W. W. Graessley. Garland Science, New York, 2004. $84.95 (559 pp.). ISBN 0-8153-4169-5

Structured Fluids: Polymers, Colloids, Surfactants . T. Witten, P. Pincus. Oxford U. Press, New York, 2004. $69.50 (216 pp.). ISBN 0-19-852688-1

Volcanism . H.-U. Schmincke. Springer-Verlag, New York, 2004. $79.95 (324 pp.). ISBN 3-540-43650-2

Alan Turing: Life and Legacy of a Great Thinker. C. Teuscher, ed. Springer-Verlag, New York, 2004. $69.95 (542 pp.). ISBN 3-540-20020-7

The Book Nobody Read: Chasing the Revolutions of Nicolaus Copernicus. O. Gingerich. Walker, New York, 2004. $25.00 (306 pp.). ISBN 0-8027-1415-3

David Sarnoff Research Center: RCA Labs to Sarnoff Corporation. A. B. Magoun. Images of America. Arcadia, Charleston, SC, 2003. $19.99 paper (128 pp.). ISBN 0-7385-1331-8

Degrees Kelvin: A Tale of Genius, Invention, and Tragedy. D. Lindley. Joseph Henry Press, Washington, DC, 2004. $27.95 (366 pp.). ISBN 0-309-09073-3

Galileo’s Pendulum: From the Rhythm of Time to the Making of Matter. R. G. Newton. Harvard U. Press, Cambridge, MA, 2004. $22.95 (153 pp.). ISBN 0-674-01331-X

Giant Telescopes: Astronomical Ambition and the Promise of Technology . W. P. McCray. Harvard U. Press, Cambridge, MA, 2004. $45.00 (367 pp.). ISBN 0-674-01147-3

Nature From Within: Gustav Theodor Fechner and His Psychophysical Worldview. M. Heidelberger (translated from German by C. Klohr). U. of Pittsburgh Press, Pittsburgh, PA, 2004. $49.95 (446 pp.). ISBN 0-8229-4210-0

On the Shoulders of Giants: The Great Works of Physics and Astronomy. S. Hawking. Running Press, Philadelphia, 2003 [2002, reissued]. $21.95 paper (1264 pp.). ISBN 0-7624-1698-X

Oppenheimer: Portrait of an Enigma. J. Bernstein. Ivan R. Dee, Chicago, 2004. $25.00 (223 pp.). ISBN 1-56663-569-1

Remarkable Physicists: From Galileo to Yukawa. I. James. Cambridge U. Press, New York, 2004. $85.00, $30.00 paper (389 pp.). ISBN 0-521-81687-4, ISBN 0-521-01706-8 paper

Who Rules in Science: An Opinionated Guide to the Wars. J. R. Brown. Harvard U. Press, Cambridge, MA, 2004 [2001, reissued]. $16.95 paper (236 pp.). ISBN 0-674-00652-6

Applied Scanning Probe Methods. B. Bhushan, H. Fuchs, S. Hosaka, eds. Nanoscience and Technology . Springer-Verlag, New York, 2004. $139.00 (476 pp.). ISBN 3-540-00527-7

Explosion Protection: Electrical Apparatus and Systems for Chemical Plants, Oil and Gas Industry, Coal Mining . H. Groh. Elsevier, New York, 2004. $74.95 (524 pp.). ISBN 0-7506-4777-9

Diffraction Analysis of the Microstructure of Materials . E. J. Mitte-meijer, P. Scardi, eds. Springer Series in Materials Science 68. Springer-Verlag, New York, 2004. $169.00 (549 pp.). ISBN 3-540-40519-4

Epitaxy: Physical Principles and Technical Implementation. M. A. Herman, W. Richter, H. Sitter. Springer Series in Materials Science 62. Springer-Verlag, New York, 2004. $119.00 (522 pp.). ISBN 3-540-67821-2

Fatigue in Ferroelectric Ceramics and Related Issues. D. C. Lupascu. Springer Series in Materials Science 61. Springer-Verlag, New York, 2004. $89.95 (225 pp.). ISBN 3-540-40235-7

High-Pressure Surface Science and Engineering . Y. Gogotsi, V. Domnich, eds. Series in Materials Science and Engineering . IOP, Philadelphia, 2004. $175.00 (639 pp.). ISBN 0-7503-0881-8

Integration of Heterogeneous Thin–Film Materials and Devices. H. A. At-water, M. I. Current, M. Levy, T. Sands, eds. Materials Research Society Symposium Proceedings 768. Proc. symp., San Francisco, Apr. 2003. MRS, Warrendale, PA, 2003. $99.00 (131 pp.). ISBN 1-55899-705-9

Microstructure of Martensite: Why It Forms and How It Gives Rise to the Shape-Memory Effect . K. Bhattacharya. Oxford Series on Materials Modelling 2. Oxford U. Press, New York, 2003. $89.50 (288 pp.). ISBN 0-19-850934-0

Nano and Microstructural Design of Advanced Materials: A Commemorative Volume on Professor G. Thomas’ Seventieth Birthday. M. A. Meyers, R. O. Ritchie, M. Sarikaya, eds. Elsevier, New York, 2003. $150.00 (303 pp.). ISBN 0-08-044373-7

Physical Methods for Materials Characterisation. 2nd ed. P. E. J. Flewitt, R. K. Wild. Series in Materials Science and Engineering . IOP, Philadelphia, 2003 [1994]. $59.99 paper (602 pp.). ISBN 0-7503-0808-7

Polyelectrolytes With Defined Molecular Architecture. Vol. 1. M. Schmidt, ed. Advances in Polymer Science 165. Springer-Verlag, New York, 2004. $249.00 (267 pp.). ISBN 3-540-00528-5

Springer Handbook of Nanotechnology . B. Bhushan, ed. Springer-Verlag, New York, 2004. $199.00 (1222 pp.). ISBN 3-540-01218-4, CD-ROM

Underneath the Bragg Peaks: Structural Analysis of Complex Materials . T. Egami, S. J. L. Billinge. Pergamon Materials Series 7. Pergamon/Elsevier, New York, 2003. $165.00 (404 pp.). ISBN 0-08-042698-0

Critical Phenomena in Natural Sciences: Chaos, Fractals, Selforganization and Disorder: Concepts and Tools. 2nd ed. D. Sornette. Springer Series in Synergetics. Springer-Verlag, New York, 2004 [2000]. $99.00 (528 pp.). ISBN 3-540-40754-5

Fractals and Chaos: The Mandelbrot Set and Beyond. Selecta Vol. C. B. B. Mandelbrot. Springer-Verlag, New York, 2004. $49.95 (308 pp.). ISBN 0-387-20158-0

The Frenkel-Kontorova Model: Concepts, Methods, and Applications. O. M. Braun, Y. S. Kivshar. Texts and Monographs in Physics. Springer-Verlag, New York, 2004. $109.00 (472 pp.). ISBN 3-540-40771-5

Nonlinear Dynamics in Polymeric Systems. J. A. Pojman, Q. Tran-Cong-Miyata, eds. ACS Symposium Series 869. Proc. symp., Boston, Aug. 2002. American Chemical Society, Washington, DC, 2004. $145.00 (351 pp.). ISBN 0-8412-3850-2

Thermodynamic Data, Models, and Phase Diagrams in Multicomponent Oxide Systems: An Assessment for Materials and Planetary Scientists Based on Calorimetric, Volumetric and Phase Equilibrium Data. O. B. Fabrichnaya, S. K. Saxena, P. Richet, E. F. Westrum, eds. Data and Knowledge in a Changing World. Springer-Verlag, New York, 2004. $129.00 (198 pp.). ISBN 3-540-14018-2

Biodynamics: Why the Wirewalker Doesn’t Fall. B. J. West, L. A. Griffin. Wiley, Hoboken, NJ, 2004. $92.50 (456 pp.). ISBN 0-471-34619-5

Classical Mechanics: Point Particles and Relativity . W. Greiner. Classical Theoretical Physics. Springer-Verlag, New York, 2004. $69.95 paper (488 pp.). ISBN 0-387-95586-0

Exploring Chaos: Theory and Experiment. B. Davies. Studies in Nonlinearity. Westview Press, Boulder, CO, 2004 [1999, reissued]. $30.00 paper (241 pp.). ISBN 0-8133-4127-2

Fundamentals of Beam Physics. J. B. Rosenzweig. Oxford U. Press, New York, 2003. $74.50 (294 pp.). ISBN 0-19-852554-0

Game Physics. D. H. Eberly. The Morgan Kaufmann Series in Interactive 3D Technology . Morgan Kaufmann/Elsevier, San Francisco, 2004. $69.95 (776 pp.). ISBN 1-55860-740-4, CD-ROM

Applied Adaptive Statistical Methods: Tests of Significance and Confidence Intervals. T. W. O’Gorman. ASA-SIAM Series on Statistics and Applied Probability. Society for Industrial and Applied Mathematics, Philadelphia, 2004. $60.00 paper (174 pp.). ISBN 0-89871-553-9

Axiomatic Consensus Theory in Group Choice and Biomathematics. W. H. E. Day, F. R. McMorris. Frontiers in Applied Mathematics. Society for Industrial and Applied Mathematics, Philadelphia, 2003. $54.00 paper (155 pp.). ISBN 0-89871-551-2

Bioterrorism: Mathematical Modeling Applications in Homeland Security. H. T. Banks, C. Castillo-Chavez, eds. Frontiers in Applied Mathematics. Society for Industrial and Applied Mathematics, Philadelphia, 2003. $78.00 paper (240 pp.). ISBN 0-89871-549-0

Capture Dynamics and Chaotic Motions in Celestial Mechanics: With Applications to the Construction of Low Energy Transfers . E. Belbruno. Princeton U. Press, Princeton, NJ, 2004. $49.95 (211 pp.). ISBN 0-691-09480-2

Catastrophe Theory . 2nd ed. D. P. L. Castrigiano, S. A. Hayes. Westview Press, Boulder, CO, 2004 [1993]. $90.00, $30.00 paper (264 pp.). ISBN 0-8133-4126-4, ISBN 0-8133-4125-6 paper

Consistent Quantum Theory . R. B. Griffiths. Cambridge U. Press, 2003 [2002, reissued]. $95.00, $50.00 paper (391 pp.). ISBN 0-521-53929-3

The Evolution of Applied Harmonic Analysis: Models of the Real World. E. Prestini. Applied and Numerical Harmonic Analysis . Birkhäuser, Boston, 2004. $59.95 paper (349 pp.). ISBN 0-8176-4125-4

Fields Medallists’ Lectures . 2nd ed. M. Atiya, D. Iagolnitzer, eds. World Scientific Series in 20th Century Mathematics 9. World Scientific, River Edge, NJ, 2003 [1997]. $118.00, $62.00 paper (806 pp.). ISBN 981-238-256-9, ISBN 981-238-259-3 paper

Geometry and Integrability. L. Mason, Y. Nutku, eds. London Mathematical Society Lecture Note Series 295. Cambridge U. Press, New York, 2003. $45.00 paper (153 pp.). ISBN 0-521-52999-9

Handbook of Nonlinear Partial Differential Equations . A. D. Polyanin, V. F. Zaitsev. Chapman & Hall/CRC, Boca Raton, FL, 2004. $99.95 (814 pp.). ISBN 1-58488-355-3

An Introduction to Modern Variational Techniques in Mechanics and Engineering . B. D. Vujanovic, T. M. Atanackovic. Birkhäuser, Boston, 2004. $74.95 (346 pp.). ISBN 0-8176-3399-5

Orientations and Rotations: Computations in Crystallographic Textures. A. Morawiec. Springer-Verlag, New York, 2004. $79.95 (200 pp.). ISBN 3-540-40734-0

Physical Processes in the Solar System: An Introduction to the Physics of Asteroids, Comets, Moons and Planets. J. D. Landstreet. Keenan & Darlington, London, Canada, 2003. $69.00 paper (350 pp.). ISBN 0-9732051-0-5

Planning Based on Decision Theory . G. D. Riccia, D. Dubois, R. Kruse, H.-J. Lenz, eds. CISM Courses and Lectures 472. Springer-Verlag, New York, 2003. $69.95 paper (165 pp.). ISBN 3-211-40756-1

Proofs From THE BOOK. 3rd ed. M. Aigner, G. M. Ziegler. Springer-Verlag, New York, 2004 [2001]. $34.95 (239 pp.). ISBN 3-540-40460-0

Quantum Control: Mathematical and Numerical Challenges. A. D. Bandrauk, M. C. Delfour, C. Le Bris, eds. CRM Proceedings and Lecture Notes 33. Proc. wksp., Montreal, Oct. 2002. American Mathematical Society, Providence, RI, 2003. $61.00 paper (211 pp.). ISBN 0-8218-3330-8

Research Directions in Distributed Parameter Systems. R. C. Smith, M. A. Demetriou, eds. Frontiers in Applied Mathematics. Society for Industrial and Applied Mathematics, Philadelphia, 2003. $61.50 paper (271 pp.). ISBN 0-89871-548-2

The Shaggy Steed of Physics: Mathematical Beauty in the Physical World. 2nd ed. D. Oliver. Springer-Verlag, New York, 2004 [1994]. $59.95 (300 pp.). ISBN 0-387-40307-8

Small Viscosity and Boundary Layer Methods: Theory, Stability Analysis, and Applications. G. Métivier. Modeling and Simulation in Science, Engineering and Technology . Birkhäuser, Boston, 2004. $69.95 (194 pp.). ISBN 0-8176-3390-1

Stability of Strong Discontinuities in Magnetohydrodynamics and Electro-hydrodynamics . A. Blokhin, Y. Trakhinin. Nova Science, Hauppauge, NY, 2003. $89.00 (307 pp.). ISBN 1-59033-752-2

The Theory of Complex Angular Momenta: Gribov Lectures on Theoretical Physics. V. N. Gribov. Cambridge U. Press, New York, 2003. $90.00 (297 pp.). ISBN 0-521-81834-6