Search Results - "Hoppel, W"

Strain rate sensitivity of ultrafine-grained aluminium processed by severe plastic deformation by May, J., Höppel, H.W., Göken, M.

“…The strain rate sensitivity of commercial purity aluminium (Al 99.5) with conventional and ultrafine (UFG) grain size is investigated by compression tests at…”
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Case studies of the mesospheric response to recent minor, major, and extended stratospheric warmings by Siskind, David. E., Eckermann, Stephen. D., McCormack, John P., Coy, Larry, Hoppel, Karl W., Baker, Nancy L.

“…We have studied the mesospheric response to two recent stratospheric warmings by performing short‐term forecasts at medium (1.5°) and high (0.5°) spatial…”
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Evolution of the quasi 2-day wave during January 2006 by McCormack, J. P., Coy, L., Hoppel, K. W.

“…We examine the evolution of the quasi 2‐day wave in the middle atmosphere during the period from 5 January to 5 February 2006 using global synoptic…”
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Wind extraction potential from ensemble Kalman filter assimilation of stratospheric ozone using a global shallow water model by Allen, D R, Hoppel, K W, Kuhl, D D

“…The feasibility of extracting wind information from stratospheric ozone observations is tested using ensemble Kalman filter (EnKF) data assimilation (DA) and a…”
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Extraction of wind and temperature information from hybrid 4D-Var assimilation of stratospheric ozone using NAVGEM by Allen, Douglas R, Hoppel, Karl W, Kuhl, David D

“…Extraction of wind and temperature information from stratospheric ozone assimilation is examined within the context of the Navy Global Environmental Model…”
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Hybrid ensemble 4DVar assimilation of stratospheric ozone using a global shallow water model by Allen, Douglas R, Hoppel, Karl W, Kuhl, David D

“…Wind extraction from stratospheric ozone (O3) assimilation is examined using a hybrid ensemble 4-D variational assimilation (4DVar) shallow water model (SWM)…”
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Amplification of the quasi-two day wave through nonlinear interaction with the migrating diurnal tide by McCormack, J. P., Eckermann, S. D., Hoppel, K. W., Vincent, R. A.

“…We present a case study of the non‐linear interaction between the quasi‐two day wave (Q2DW) and the migrating diurnal tide based on global synoptic meridional…”
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The Innovation Potential of Bulk Nanostructured Materials by Valiev, R. Z., Zehetbauer, M. J., Estrin, Y., Höppel, H. W., Ivanisenko, Y., Hahn, H., Wilde, G., Roven, H. J., Sauvage, X., Langdon, T. G.

“…The innovation potential is high for bulk nanostructured materials (BNM) produced by methods of severe plastic deformation and accordingly this report focuses…”
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Fatigue and microstructure of ultrafine-grained metals produced by severe plastic deformation by Mughrabi, H, Höppel, H.W, Kautz, M

“…The cyclic deformation and fatigue behaviour of ultrafine-grained metals produced by the severe plastic deformation technique ECAP (equal channel angular…”
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Seasonal variation of the quasi 5 day planetary wave: Causes and consequences for polar mesospheric cloud variability in 2007 by Nielsen, K., Siskind, D. E., Eckermann, S. D., Hoppel, K. W., Coy, L., McCormack, J. P., Benze, S., Randall, C. E., Hervig, M. E.

“…We have investigated the 5 day wave in both temperature and water vapor in the stratosphere and mesosphere as seen in the Navy Operational Global Atmospheric…”
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Limitations of wind extraction from 4D-Var assimilation of ozone by Allen, D. R, Hoppel, K. W, Nedoluha, G. E, Kuhl, D. D, Baker, N. L, Xu, L, Rosmond, T. E

“…Time-dependent variational data assimilation allows the possibility of extracting wind information from observations of ozone or other trace gases. Since trace…”
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Tidally induced variations of polar mesospheric cloud altitudes and ice water content using a data assimilation system by Stevens, Michael H., Siskind, David E., Eckermann, Stephen D., Coy, Lawrence, McCormack, John P., Englert, Christoph R., Hoppel, Karl W., Nielsen, Kim, Kochenash, Andrew J., Hervig, Mark E., Randall, Cora E., Lumpe, Jerry, Bailey, Scott M., Rapp, Markus, Hoffmann, Peter

“…A variety of spaceborne experiments have observed polar mesospheric clouds (PMC) since the late 20th century. Many of these experiments are on satellites in…”
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Assimilation of stratospheric and mesospheric temperatures from MLS and SABER into a global NWP model by Hoppel, K. W., Baker, N. L., Coy, L., Eckermann, S. D., McCormack, J. P., Nedoluha, G. E., Siskind, D. E.

“…The forecast model and three-dimensional variational data assimilation components of the Navy Operational Global Atmospheric Prediction System (NOGAPS) have…”
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Deformation kinetics of nanocrystalline nickel by Li, Y.J., Mueller, J., Höppel, H.W., Göken, M., Blum, W.

“…The work hardening and the strain rate sensitivity of flow stress were studied in the temperature range from 298 to 473 K for nanocrystalline (NC) nickel with…”
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Influence of grain boundaries on the deformation resistance: insights from an investigation of deformation kinetics and microstructure of copper after predeformation by ECAP by Bach, J., Liebig, J.P., Höppel, H.W., Blum, W.

“…The grain structure of coarse-grained Cu of different degrees of purity was modified by plastic deformation by , 4 and 8 passes of equal channel angular…”
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Intensity and phase statistics of multilook polarimetric and interferometric SAR imagery by Jong-Sen Lee, Hoppel, K.W., Mango, S.A., Miller, A.R.

“…Polarimetric and interferometric SAR data are frequently multilook processed for speckle reduction and data compression. The statistical characteristics of…”
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POAM III retrieval algorithm and error analysis by Lumpe, J. D., Bevilacqua, R. M., Hoppel, K. W., Randall, C. E.

“…This paper describes the operational version 3 algorithms used to analyze data from the Polar Ozone and Aerosol Measurement (POAM) III instrument. We include a…”
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Mesospheric Precursors to the Major Stratospheric Sudden Warming of 2009: Validation and Dynamical Attribution Using a Ground‐to‐Edge‐of‐Space Data Assimilation System by Coy, L., Eckermann, S. D., Hoppel, K. W., Sassi, F

“…Global meteorological analyses from an assimilation of operational and research observations spanning the ∼0–90 km altitude range confirm earlier tentative…”
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Monotonic and cyclic deformation behaviour of ultrafine-grained aluminium by May, J., Amberger, D., Dinkel, M., Höppel, H.W., Göken, M.

“…The effect of the enhanced strain-rate sensitivity (SRS) of ultrafine-grained commercially pure aluminium Al 99.5 on the mechanical properties under monotonic…”
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Surface source function for sea-salt aerosol and aerosol dry deposition to the ocean surface by Hoppel, W. A., Frick, G. M., Fitzgerald, J. W.

“…The dry deposition velocity for a uniform surface source of particles, such as sea‐salt aerosol, is shown to be fundamentally different than that for a source…”
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