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282 results on '"Burkard, R."'

4. Center problems with pos/neg weights on trees

Author

Burkard, R. E. and Dollani, Helidon

Subjects
Algorithms -- Usage, Plant layout -- Management, Plant layout -- Research, Algorithm, Company business management, Business, Business, general, Business, international
Abstract

A solution for the obnoxious facility location problem, using time complexity algorithm, is presented.

Published
2003

24. Conventional and cross-correlation brain-stem auditory evoked responses in the white leghorn chick: rate manipulations

Author

Burkard, R, Jones, S, and Jones, T

Subjects
Life Sciences (General)
Abstract

Rate-dependent changes in the chick brain-stem auditory evoked response (BAER) using conventional averaging and a cross-correlation technique were investigated. Five 15- to 19-day-old white leghorn chicks were anesthetized with Chloropent. In each chick, the left ear was acoustically stimulated. Electrical pulses of 0.1-ms duration were shaped, attenuated, and passed through a current driver to an Etymotic ER-2 which was sealed in the ear canal. Electrical activity from stainless-steel electrodes was amplified, filtered (300-3000 Hz) and digitized at 20 kHz. Click levels included 70 and 90 dB peSPL. In each animal, conventional BAERs were obtained at rates ranging from 5 to 90 Hz. BAERs were also obtained using a cross-correlation technique involving pseudorandom pulse sequences called maximum length sequences (MLSs). The minimum time between pulses, called the minimum pulse interval (MPI), ranged from 0.5 to 6 ms. Two BAERs were obtained for each condition. Dependent variables included the latency and amplitude of the cochlear microphonic (CM), wave 2 and wave 3. BAERs were observed in all chicks, for all level by rate combinations for both conventional and MLS BAERs. There was no effect of click level or rate on the latency of the CM. The latency of waves 2 and 3 increased with decreasing click level and increasing rate. CM amplitude decreased with decreasing click level, but was not influenced by click rate for the 70 dB peSPL condition. For the 90 dB peSPL click, CM amplitude was uninfluenced by click rate for conventional averaging. For MLS BAERs, CM amplitude was similar to conventional averaging for longer MPIs.(ABSTRACT TRUNCATED AT 250 WORDS).

Published
1994

25. On general decomposition schemes in mathematical programming

Author

Burkard, R. E., Hamacher, H. W., Tind, J., Cottle, R. W., editor, Dixon, L. C. W., editor, Korte, B., editor, Todd, M. J., editor, Allgower, E. L., editor, Cunningham, W. H., editor, Dennis, J. E., Jr., editor, Eaves, B. C., editor, Fletcher, R., editor, Goldfarb, D., editor, Hiriart-Urruty, J.- B., editor, Iri, M., editor, Jeroslow, R. G., editor, Johnson, D. S., editor, Lemarechal, C., editor, Lovasz, L., editor, McLinden, L., editor, Powell, M. J. D., editor, Pulleyblank, W. R., editor, Rinnooy Kan, A. H. G., editor, Ritter, K., editor, Sargent, R. W. H., editor, Shanno, D. F., editor, Trotter, L. E., Jr., editor, Tuy, H., editor, Wets, R. J. B., editor, Beale, E. M. L., editor, Dantzig, G. B., editor, Kantorovich, L. V., editor, Koopmans, T. C., editor, Tucker, A. W., editor, and Wolfe, P., editor

Published
1985
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26. Weakly admissible transformations for solving algebraic assignment and transportation problems

Author

Burkard, R. E., Zimmermann, U., Balinski, M. L., editor, Beale, E. M. L., editor, Dantzig, George B., editor, Kantorovich, L., editor, Koopmans, Tjalling C., editor, Tucker, A. W., editor, Wolfe, Philip, editor, Bartels, R., editor, Chvátal, Václav, editor, Cottle, Richard W., editor, Dennis, J. E., Jr., editor, Eaves, B. Curtis, editor, Fletcher, R., editor, Korte, B., editor, Iri, Masao, editor, Lemarechal, C., editor, Lemke, C. E., editor, Nemhauser, George L., editor, Padberg, Manfred W., editor, Powell, M. J. D., editor, Shapiro, Jeremy F., editor, Shapley, L. S., editor, Spielberg, K., editor, Tuy, Hoang, editor, Walkup, D. W., editor, Wets, Roger, editor, Witzgall, C., editor, and Padberg, M. W., editor

Published
1980
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27. A comparison of the performance of three types of passive fog gauges under conditions of wind-driven fog and precipitation

Author

Frumau, K.F.A., Burkard, R., Schmid, S., Bruijnzeel, L.A., Tobón, C., Calvo-Alvado\, J.C., and Hydrology and Geo-environmental sciences

Abstract

Understanding of the 'typical' amounts of fog intercepted by different types of cloud forests is hampered by a lack of comparative information on local fog climatology. Usually some kind of 'fog gauge' is used to characterize fog occurrence and amounts. Moreover, wind-driven fog and precipitation are difficult to measure separately and reported measurements of 'fog' often represent a combination of the two. In this paper, the term 'occult precipitation' (HP) is used to represent fog in combination with the horizontal component of wind-driven precipitation (WDR). Collection efficiencies of three widely used types of passive fog gauges, viz. a wire harp (WH) screen, a modified cylindrical gauge (MJU, Juvik-type) and a tunnel gauge (TTG, Daube-type), were derived by comparing the volumes of water collected by the respective gauges with horizontal cloud water fluxes (CWFs) derived from wind speed (u) and the fog liquid water content (LWC) as measured by a cloud particle spectrometer during conditions of fog at a windward cloud forest site in northern Costa Rica. Under conditions of fog-only, the collection efficiencies of the three gauges were linearly related to the horizontal CWF as measured by the gauges themselves. Therefore, additional information on wind speed, droplet size and fog LWC was not needed. During conditions of HP, relative collection efficiencies were derived by comparing the volumes collected by the respective gauge types. The modified Juvik gauge had an efficiency close to 100%, independently of the wind speed and direction, whereas the efficiency of the WH depended critically on the wind speed. The tunnel gauge had an efficiency comparable to that of the Juvik gauge, with some additional catch occurring under conditions of low precipitation angles due to the reclined frontal surface of the gauge. Copyright © 2010 John Wiley & Sons, Ltd.

Published
2011

32. Buchbesprechungen

Author

Merkel, H. Helmut, Läpple, H., Hammann, P., Müller-Merbach, H., Krabs, W., Fandel, G., Dehnert, G., Burkard, R., Jahnke, B., Cremer, R., and Sommer, H.

Published
1978
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35. Book reviews

Author

Wagenhals, G., Elsner, W., Schneeweiß, H., Adams, J. E., Grüske, K. -D., Nowotny, E., Vetschera, R., and Burkard, R.

Published
1983
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36. Book reviews

Author

Nagels, B., Wobith, B., Zijlstra, M., Burkard, R. E., Ziegler, H., and Feichtinger, G.

Published
1983
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37. Book reviews

Author

Radermacher, F. J., Liebling, Thomas M., Wacker, H. J., Schaible, S., Burkard, R. E., Aigner, A., and Cuninghame-Green, R. A.

Published
1985
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40. Buchbesprechungen

Author

Rosenmüller, J., Wieken, J. -H., Gaede, K. -W., Liebling, T. M., Voß, St., von Dobschütz, L., Fleischmann, B., Kall, P., and Burkard, R. E.

Published
1986
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41. Buchbesprechungen

Author

Späth, H., Wegmann, H., Fallaschinski, K., Münnich, F. E., Burkard, R., Liebling, Th. M., Bühler, W., Heinhold, J., Eicher, K., and Läpple, H.

Published
1975
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45. Using eddy covariance and stable isotope mass balance techniques to estimate fog water contributions to a Costa Rican cloud forest during the dry season

Author

Schmid, S., Burkard, R., Frumau, K.F.A., Tobón, C., Bruijnzeel, L.A., Siegwolf, R., Eugster, W., and Hydrology and Geo-environmental sciences

Abstract

Fog deposition, precipitation, throughfall and stemflow were measured in a windward tropical montane cloud forest near Monteverde, Costa Rica, for a 65-day period during the dry season of 2003. Net fog deposition was measured directly using the eddy covariance (EC) method and it amounted to 1·2 ± 0·1 mm day

Published
2011

50. Fog as a hydrological input

Author

Bruijnzeel, L.A., Eugster, W., Burkard, R., Anderson, M.G., and Hydrology and Geo-environmental sciences

Published
2005

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