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2007

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Articles 3931 - 3960 of 6758

Full-Text Articles in Physical Sciences and Mathematics

Cretaceous And Tertiary Extension Throughout The Ross Sea, Antarctica, Robert C. Decesari, D. S. Wilson, B. P. Luyendyk, Michael Faulkner Jan 2007

Cretaceous And Tertiary Extension Throughout The Ross Sea, Antarctica, Robert C. Decesari, D. S. Wilson, B. P. Luyendyk, Michael Faulkner

ANDRILL Related Publications of Affiliates

Marine geophysical data from the deep sea adjacent to the Ross Sea, Antarctica suggest that 170 km of extension occurred between East and West Antarctica from 46 to 21 Ma. The Northern and Victoria Land Basins in the western Ross Sea adjacent to the Transantarctic Mountains accommodated 95 km of this extension. Several kilometers of Oligocene sediments are found in the Central Trough and Eastern Basin in the eastern Ross Sea. Subsidence modeling accounts for these accumulations with about 40 km of extension in each basin centered on 35 Ma; therefore Ross Sea-wide Tertiary extension was comparable to extension in …

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Regional Seismic Stratigraphic Correlations Of The Ross Sea: Implications For The Tectonic History Of The West Antarctic Rift System, R. C. Decesari, C. C. Sorlien, B. P. Luyendyk, D. S. Wilson, L. R. Bartek, John Diebold, Sarah E. Hopkins Jan 2007

Regional Seismic Stratigraphic Correlations Of The Ross Sea: Implications For The Tectonic History Of The West Antarctic Rift System, R. C. Decesari, C. C. Sorlien, B. P. Luyendyk, D. S. Wilson, L. R. Bartek, John Diebold, Sarah E. Hopkins

ANDRILL Related Publications of Affiliates

Using existing and new seismic reflection data, new and updated correlations of late Oligocene-early Miocene RSS-2 strata were made between the southern parts of Ross Sea basins. Previous studies documented Cretaceous extension across much of Ross Sea. We interpret that Cenozoic extension also occurred across Ross Sea. Subsidence during and following this extension deepened existing basins and may have initiated basins in the west, subsiding ridges between basins below sea level during the late Oligocene. Pre-Oligocene strata record cessation of L. Cretaceous extension in easternmost Ross Sea. Successively younger Cenozoic extension occurred from east to west across the rest of …

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Scale Of Subglacial To Sub-Ice Shelf Facies Variability, Eastern Basin, Ross Sea, Audrey S. Loth, L. R. Bartek Iii, B. P. Luyendyk, D. S. Wilson, Christopher C. Sorlien Jan 2007

Scale Of Subglacial To Sub-Ice Shelf Facies Variability, Eastern Basin, Ross Sea, Audrey S. Loth, L. R. Bartek Iii, B. P. Luyendyk, D. S. Wilson, Christopher C. Sorlien

ANDRILL Related Publications of Affiliates

The Eastern Basin within the Ross Sea records changes in the volume of the West Antarctic Ice Sheet (WAIS). Examination of multibeam data revealed four acoustic facies that vary from west to east in a 900 km2 area. It is hypothesized that these facies, that formed nearly contemporaneously, are the result of differences in proximity to the grounding line and its relationship with the seafloor. The four facies are 1. Mega-Scale Lineation, 2. Slightly-Lineated Ridge Crest, 3. Discontinuous Ridges, 4. Irregular Mounds. These trends were also seen in SCS data, distinctively on the seafloor and mutedly at depth. Through determining …

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40Ar-39Ar Age Constraints On Volcanism And Tectonism In The Terror Rift Of The Ross Sea, Antarctica, S. E. Rilling, S. B. Mukasa, T. J. Wilson, L. A. Lawver Jan 2007

40Ar-39Ar Age Constraints On Volcanism And Tectonism In The Terror Rift Of The Ross Sea, Antarctica, S. E. Rilling, S. B. Mukasa, T. J. Wilson, L. A. Lawver

ANDRILL Related Publications of Affiliates

Volcanic sills and dikes inferred from seismic reflection profiles and geophysical studies of the Ross Sea are thought to be related to the rift basins in the region, and their emplacement to be coeval with extension. However, lack of precise geochronology in the Terror Rift of the Ross Sea region has left these inferred relationships poorly constrained and has hindered neotectonic studies, because of the large temporal gaps between seismic reflectors of known ages. New 40Ar/39Ar geochronology presented here for submarine volcanic rocks provides better age constraints for neotectonic interpretations within the Terror Rift. Several samples from …

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Lu−Hf Systematics Of The Ultra-High Temperature Napier Complex, East Antarctica: Evidence For The Early Archean Differentiation Of Earth’S Mantle, S. B. Mukasa, S. H. Choi, A. V. Andronikov, Y. Osanai, S. L. Harley, N. M. Kelly Jan 2007

Lu−Hf Systematics Of The Ultra-High Temperature Napier Complex, East Antarctica: Evidence For The Early Archean Differentiation Of Earth’S Mantle, S. B. Mukasa, S. H. Choi, A. V. Andronikov, Y. Osanai, S. L. Harley, N. M. Kelly

ANDRILL Related Publications of Affiliates

The Napier Complex comprises some of the oldest rocks on earth (~3.8 billion years old), overprinted by an ultra-high temperature (UHT) metamorphic event near the Archean−Proterozoic boundary. Garnet, orthopyroxene, sapphirine, osumilite, rutile and a whole rock representing an equilibrated assemblage from this belt yield a Lu−Hf isochron age of 2,403 ± 43 Ma. Preservation of the UHT mineral assemblage in the rock analyzed suggests rapid cooling with closure likely to have occurred for the Lu−Hf system at post-peak UHT conditions near a temperature of ~800°C. Zircon εHf values measured “see through” the UHT metamorphism and show that the source of …

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A Sediment Model And Retreat History For The Ross Ice (Sheet) Shelf In The Western Ross Sea Since The Last Glacial Maximum, R. M. Mckay, G. B. Dunbar, T. R. Naish, P. J. Barrett, L. Carter, M. Harper Jan 2007

A Sediment Model And Retreat History For The Ross Ice (Sheet) Shelf In The Western Ross Sea Since The Last Glacial Maximum, R. M. Mckay, G. B. Dunbar, T. R. Naish, P. J. Barrett, L. Carter, M. Harper

ANDRILL Related Publications of Affiliates

Three sediment gravity cores collected from beneath the McMurdo Ice Shelf and six piston cores from the Erebus Basin (in McMurdo Sound) and the Lewis Basin (north of Ross Island) were analysed in order to construct a retreat history for the West Antarctic Ice Sheet in the Ross embayment since the Last Glacial Maximum. The cores display a characteristic succession of sedimentary facies that record a transition from deposition beneath a marine terminating ice sheet to open-marine conditions. The base of the succession comprises a slightly consolidated, clast-rich muddy diamict dominated by basement clasts from the Transantarctic Mountains, and interpreted …

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Showing A Strong Link Between Climatic And PCo2 Changes: Resolving Discrepancies Between Oceanographic And Antarctic Climate Records For The Oligocene And Early Miocene (34-16 Ma), Stephan Pekar, N. Christie-Blick Jan 2007

Showing A Strong Link Between Climatic And PCo2 Changes: Resolving Discrepancies Between Oceanographic And Antarctic Climate Records For The Oligocene And Early Miocene (34-16 Ma), Stephan Pekar, N. Christie-Blick

ANDRILL Related Publications of Affiliates

An apparent mismatch between published oxygen isotope data and other paleoclimate proxies for the span from 26-16 Ma is resolved by calibration against eustatic estimates obtained from backstripped continental margin stratigraphy. Ice-volume estimates from calibrated oxygen isotope data compare favorably with stratigraphic and palynological data from Antarctica, and with estimates of atmospheric carbon dioxide for the early Oligocene through early Miocene (34-16 Ma). These isotopic data suggest that the East Antarctic Ice Sheet grew to as much as 30% greater than the present-day ice volume at glacial maxima. This conclusion is corroborated by seismic reflection and stratigraphic data from the …

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Constraints From Detrital Zircon Geochronology On The Early Deformation Of The Ross Orogen, Transantarctic Mountains, Antarctica, Edmund Stump, George Gehrels, Franco M. Talarico, Rodolfo Carosi Jan 2007

Constraints From Detrital Zircon Geochronology On The Early Deformation Of The Ross Orogen, Transantarctic Mountains, Antarctica, Edmund Stump, George Gehrels, Franco M. Talarico, Rodolfo Carosi

ANDRILL Related Publications of Affiliates

New ages of detrital zircons constrain the timing of the onset of deformation in the Ross orogen. In the Skelton Glacier area, Skelton Group was deformed before cross-cutting intrusion at 551 Ma. The youngest, significant, age-probability peaks from three samples of Skelton Group are 649 Ma, 684 Ma, and 691 Ma. The 649 Ma peak may be considered the maximum depositional age of Skelton Group, constraining the period of deformation to between 649 Ma and 551 Ma. In the upper Scott Glacier area, La Gorce Formation was deformed prior to cross-cutting intrusion at 526 Ma. The youngest, significant, age-probability peaks …

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Gold Bearing Veining Linked To Transcrustal Fault Zones In The Transantarctic Mountains (Northern Victoria Land, Antarctica), L. Crispini, G. Capponi, L. Federico, F. Talarico Jan 2007

Gold Bearing Veining Linked To Transcrustal Fault Zones In The Transantarctic Mountains (Northern Victoria Land, Antarctica), L. Crispini, G. Capponi, L. Federico, F. Talarico

ANDRILL Related Publications of Affiliates

Gold mineralization is associated with the paleo-Pacific margin of Gondwana and is related to processes of subduction/accretion and magmatism. Northern Victoria Land (Antarctica) was part of this margin during the Paleozoic, however no occurrence of gold has been reported up to now in the Transantarctic Mountains. Here we describe for the first time gold-bearing quartz veins in northern Victoria Land. The veins are hosted primarily by metabasalts and occur in a brittle-ductile high strain zone with curved geometry and reverse kinematic. Veins are extensional and shear veins; they often have ribbon/banded texture typical of crack and seal processes. Preliminary petrographic …

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Geology Of The Byrd Glacier Discontinuity (Ross Orogen): New Survey Data From The Britannia Range, Antarctica, R. Carosi, F. Giacomini, F. Talarico, Edmund Stump Jan 2007

Geology Of The Byrd Glacier Discontinuity (Ross Orogen): New Survey Data From The Britannia Range, Antarctica, R. Carosi, F. Giacomini, F. Talarico, Edmund Stump

ANDRILL Related Publications of Affiliates

Field activities in the Britannia Range (Transantarctic Mountains, Antarctica) highlighted new geological features around the so-called Byrd Glacier discontinuity. Recent field surveys revealed the occurrence of significant amounts of medium- to high-grade metamorphic rocks, intruded by abundant coarse-grained porphyritic granitoids. Most of the granitoids are deformed, with foliation parallel to the regional foliation in the metamorphics. Two main episodes of deformation are observed. Tight to isoclinal folds and penetrative axial plane foliation are related to the D1 phase, open folds to the D2. The main foliation (D1) trends nearly E-W in agreement with the trend in the southern portion of …

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Summary And Highlights Of The 10th International Symposium On Antarctic Earth Sciences, T. J. Wilson, R. E. Bell, P. Fitzgerald, S. B. Mukasa, R. D. Powell, C. Finn Jan 2007

Summary And Highlights Of The 10th International Symposium On Antarctic Earth Sciences, T. J. Wilson, R. E. Bell, P. Fitzgerald, S. B. Mukasa, R. D. Powell, C. Finn

ANDRILL Related Publications of Affiliates

The 10th International Symposium on Antarctic Earth Sciences (10th ISAES) was convened at the University of California, Santa Barbara, in August 2007. At the symposium about 350 researchers presented talks and posters with new results on major topics, including climate change, biotic evolution, magmatic processes, surface processes, tectonics, geodynamics, and the cryosphere. The symposium resulted in 335 papers and extended abstracts (Cooper et al., 2007, and this volume). Many science discoveries were presented spanning the last 2 billion years, from times when Antarctica was part of former supercontinents Rodinia and Gondwana to the present when Antarctica is an isolated, ice-covered …

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A High-Resolution Aeromagnetic Survey Over The Cape Roberts Rift Basin: Correlations With Seismic Reflection And Magnetic Susceptibility Log Data, E. Armadillo, F. Ferraccioli, M. Gambetta, F. Talarico, A. Zunino, M. Zangani, E. Bozzo Jan 2007

A High-Resolution Aeromagnetic Survey Over The Cape Roberts Rift Basin: Correlations With Seismic Reflection And Magnetic Susceptibility Log Data, E. Armadillo, F. Ferraccioli, M. Gambetta, F. Talarico, A. Zunino, M. Zangani, E. Bozzo

ANDRILL Related Publications of Affiliates

A high-resolution aeromagnetic survey (altitude 125 m asl, spacing 500 m , area 800 km2) was carried out in 1994 offshore of Cape Roberts by the GITARA (German ITalian Aeromagnetic Research in Antarctica) Group. The availability from drilling of whole-core physical properties logs for magnetic susceptibility, P-wave velocity and density/porosity data allows new insights to be inferred from reprocessed and reviewed HRAM aeromagnetic data. Aeromagnetic data have been reprocessed to image with greater detail the structural framework along the western flank of the Victoria Land Basin. New processing includes 2D Werner and 3D Euler deconvolution, the production of …

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Modular Exponentiation Via The Explicit Chinese Remainder Theorem, Daniel J. Bernstein, Jonathan P. Sorenson Jan 2007

Modular Exponentiation Via The Explicit Chinese Remainder Theorem, Daniel J. Bernstein, Jonathan P. Sorenson

Scholarship and Professional Work - LAS

In this paper we consider the problem of computing xe mod m for large integers x, e, and m. This is the bottleneck in Rabin’s algorithm for testing primality, the Diffie-Hellman algorithm for exchanging cryptographic keys, and many other common algorithms.

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Dinosaur Tectonics: A Structural Analysis Of Theropod Undertracks With A Reconstruction Of Theropod Walking Dynamics, Ole Graversen, Jesper Milán, David B. Loope Jan 2007

Dinosaur Tectonics: A Structural Analysis Of Theropod Undertracks With A Reconstruction Of Theropod Walking Dynamics, Ole Graversen, Jesper Milán, David B. Loope

Department of Earth and Atmospheric Sciences: Faculty Publications

A dinosaur trackway in the Middle Jurassic eolian Entrada Sandstone of southern Utah, U.S.A., exposes three undertracks that we have modeled as isolated tectonic regimes showing the development of fold-thrust ramp systems induced by the dinosaur’s feet. The faulted and folded sequence is comparable to crustal-scale tectonics associated with plate tectonics and foreland fold-thrust belts. A structural analysis of the dinosaur tracks shows the timing and direction of the forces exercised on the substrate by the animal’s foot during the stride. Based on the structural analysis, we establish a scenario for foot movements and weight distribution in the feet. During …

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Burrows Dug By Large Vertebrates Into Rain-Moistened Middle Jurassic Sand Dunes: A Reply, David B. Loope Jan 2007

Burrows Dug By Large Vertebrates Into Rain-Moistened Middle Jurassic Sand Dunes: A Reply, David B. Loope

Department of Earth and Atmospheric Sciences: Faculty Publications

Odier (2007) is concerned with two issues: (1) I did not cite his work on burrows in the Navajo Sandstones of southeastern Utah in my article (Loope 2006), and (2) he believes I amwrong in interpreting the structures preserved in the Entrada Sandstone as burrows. On the first issue, I failed to cite both his 2004 abstract and the newly published book that he sent me in October 2006. My article was accepted on June 12, 2006; I returned the proofs on August 23; and the issue was published online on October 4, 2006. The timing of these events makes …

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Stream Network Characteristics Used To Infer The Distribution Of Fold Types In The Zagros Simply Folded Belt, Iran, Caroline M. Burberry, John W. Cosgrove, Jian Guo Liu Jan 2007

Stream Network Characteristics Used To Infer The Distribution Of Fold Types In The Zagros Simply Folded Belt, Iran, Caroline M. Burberry, John W. Cosgrove, Jian Guo Liu

Department of Earth and Atmospheric Sciences: Faculty Publications

Progressive deformation at a convergent margin (the Zagros Simply Folded Belt) was analysed using satellite images, digital elevation models, contour maps and artificially generated stream networks. Two end-member fold types (fault-bend folds and detachment folds) interact with streams flowing from the High Zagros Mountains into the Persian Gulf. Growing folds divert streams and create wind or water gaps in characteristic patterns which are related to the uplift histories of the two fold types. Additionally, the symmetry of minor channels reflects the inherent symmetry of the folds. The distribution of fold types is shown for the region N27°- N30°, E50°-E54° at …

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Observational Analysis Of The 27 May 1997 Central Texas Tornadic Event. Part Ii: Tornadoes, Adam L. Houston, Robert B. Wilhelmson Jan 2007

Observational Analysis Of The 27 May 1997 Central Texas Tornadic Event. Part Ii: Tornadoes, Adam L. Houston, Robert B. Wilhelmson

Department of Earth and Atmospheric Sciences: Faculty Publications

The 27 May 1997 central Texas tornadic event has been investigated in a two-part observational study. As demonstrated in Part I, the 1D environment associated with this event was unfavorable for significant (≥F2) tornadoes. Yet, the storm complex produced at least six significant tornadoes, including one rated F5 (the Jarrell, Texas, tornado). The purpose of this article is to examine the spatiotemporal interrelationships between tornadoes, preexisting boundaries, antecedent low-level mesocyclones, convective cells, and midlevel mesocyclones. It is shown that each of the six observed tornadoes that produced greater than F0 damage formed along the storm-generated gust front, not along preexisting …

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Modeling Annual Extreme Precipitation In China Using The Generalized Extreme Value Distribution, Song Feng, Saralees Nadarajah, Qi Hu Jan 2007

Modeling Annual Extreme Precipitation In China Using The Generalized Extreme Value Distribution, Song Feng, Saralees Nadarajah, Qi Hu

Department of Earth and Atmospheric Sciences: Faculty Publications

Extreme precipitation events are the major causes of severe floods in China. In this study, four time series of daily, 2-day, 5-day, and 10-day annual maximum precipitation from 1951 to 2000 at 651 weather stations in China were analyzed. The generalized extreme value (GEV) distribution was used, to model the annual extreme precipitation events at each station. The GEV distribution was also modified to explore the linear temporal trends in the extreme events. The results showed that more than 12% of the stations have significant (p-value < 0.10) linear trends. Decreasing trends are mainly observed in northern China, and increasing trends are observed in the Yangtze River basin and northwestern China. The return periods of extreme participation have changed stations with significant temporal trends. The 50-year event observed in parts of the Yangtze River basin, and northwestern China during the 1951-60, has become a more frequent 25-year event in the 1990s. The spatial distribution of the return levels of the 651 stations are closely related to the climatic mean precipitation, and are influenced by the East Asian summer monsoon system (return levels are measures of extremity – for example, a 10 year return level is the value that can be expected to be exceeded on average once in every 10 years). The return period of extreme precipitation, that caused the 1998 severe floods in the Yangtze River basin, was also evaluated from a probabilistic perspective.

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Sufficient Condition For The Coherent Control Of N -Qubit Systems, R. Cabrera, Chitra Rangan, W.E. Baylis Jan 2007

Sufficient Condition For The Coherent Control Of N -Qubit Systems, R. Cabrera, Chitra Rangan, W.E. Baylis

Physics Publications

We study quantum systems with even numbers N of levels that are completely state controlled by unitary transformations generated by Lie algebras isomorphic to sp(N) of dimension N(N+1) 2 as discussed by Albertini and D'Allesandro [IEEE Trans. Autom. Control 48, 1399 (2003)]. These Lie algebras are smaller than the corresponding su(N) with dimension N2 -1. We show that this reduction constrains the field-free Hamiltonian to have symmetric energy levels. An example of such a system is an n -qubit system with state-independent interaction terms. Using Clifford's geometric algebra to represent the quantum wave function of a finite system, we present …

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A Multiplet Table For Neutral Helium (4he I) With Transition Rates, Gordon W. F. Drake, D. C. Morton Jan 2007

A Multiplet Table For Neutral Helium (4he I) With Transition Rates, Gordon W. F. Drake, D. C. Morton

Physics Publications

This paper combines the precise determination of the energy levels of 4He I from calculations and experiments with theoretical transition probabilities to present multiplet tables and finding lists for the fine structure of the helium atom. The tabulated transition rates and oscillator strengths include corrections for singlet-triplet mixing and spin-orbit coupling, but not the higher order relativistic terms nor the finite nuclear mass, although the latter are tabulated for future use. The results are consistent with laboratory lifetimes and oscillator strengths, but very few measurements are accurate enough to be stringent tests. An Appendix discusses the corrections for finite nuclear …

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Escherichia Coli Identification And Strain Discrimination Using Nanosecond Laser-Induced Breakdown Spectroscopy, J. Diedrich, Steven J. Rehse, S. Palchaudhuri Jan 2007

Escherichia Coli Identification And Strain Discrimination Using Nanosecond Laser-Induced Breakdown Spectroscopy, J. Diedrich, Steven J. Rehse, S. Palchaudhuri

Physics Publications

Three strains of Escherichia coli, one strain of environmental mold, and one strain of Candida albicans yeast have been analyzed by laser-induced breakdown spectroscopy using nanosecond laser pulses. All microorganisms were analyzed while still alive and with no sample preparation. Nineteen atomic and ionic emission lines have been identified in the spectrum, which is dominated by calcium, magnesium, and sodium. A discriminant function analysis has been used to discriminate between the biotypes and E. coli strains. This analysis showed efficient discrimination between laser-induced breakdown spectroscopy spectra from different strains of a single bacteria species.

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Detection Of Trace Al In Model Biological Tissue With Laser-Induced Breakdown Spectroscopy, M.D. Adamson, Steven J. Rehse Jan 2007

Detection Of Trace Al In Model Biological Tissue With Laser-Induced Breakdown Spectroscopy, M.D. Adamson, Steven J. Rehse

Physics Publications

Laser-induced breakdown spectroscopy (LIBS), which is an excellent tool for trace elemental analysis, was studied as a method of detecting sub-part-per-106 (ppm) concentrations of aluminum in surrogates of human tissue. Tissue was modeled using a 2% agarose gelatin doped with an Al2O3 nanoparticle suspension. A calibration curve created with standard reference samples of known Al concentrations was used to determine the limit of detection, which was less than 1 ppm. Rates of false negative and false positive detection results for a much more realistic sampling methodology were also studied, suggesting that LIBS could be a candidate for the real-time in …

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Pathogenic Escherichia Coli Strain Discrimination Using Laser-Induced Breakdown Spectroscopy, J. Diedrich, Steven J. Rehse, S. Palchaudhuri Jan 2007

Pathogenic Escherichia Coli Strain Discrimination Using Laser-Induced Breakdown Spectroscopy, J. Diedrich, Steven J. Rehse, S. Palchaudhuri

Physics Publications

A pathogenic strain of bacteria, Escherichia coli O157:H7 (enterohemorrhagic E. coli or EHEC), has been analyzed by laser-induced breakdown spectroscopy (LIBS) with nanosecond pulses and compared to three nonpathogenic E. coli strains: a laboratory strain of K-12 (AB), a derivative of the same strain termed HF4714, and an environmental strain, E. coli C (Nino C). A discriminant function analysis (DFA) was performed on the LIBS spectra obtained from live colonies of all four strains. Utilizing the emission intensity of 19 atomic and ionic transitions from trace inorganic elements, the DFA revealed significant differences between EHEC and the Nino C strain, …

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Hyperfine Structure Of The 23p State Of 3he With And Without An External Magnetic Field, Q. Wu, Gordon W. F. Drake Jan 2007

Hyperfine Structure Of The 23p State Of 3he With And Without An External Magnetic Field, Q. Wu, Gordon W. F. Drake

Physics Publications

The hyperfine structure of the 23P state of 3He with and without an external magnetic field is precisely calculated. All the linear terms, diamagnetic terms and the α2 relativistic correction terms are included in the Zeeman Hamiltonian. The values of the fields for 32 crossings and 5 anticrossings of the magnetic sublevels are theoretically predicted for magnetic field strengths up to 10 000 gauss. The results are compared with experimental data and other theoretical works. All related matrix elements are calculated with high accuracy by the use of double basis set Hylleraas-type variational wavefunctions. © 2007 IOP Publishing Ltd.

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Editorial: The Scope Of Physical Review A And Editorial Procedures, Gordon W. F. Drake Jan 2007

Editorial: The Scope Of Physical Review A And Editorial Procedures, Gordon W. F. Drake

Physics Publications

No abstract provided.

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Ionization Energy Of Li 6,7 Determined By Triple-Resonance Laser Spectroscopy, B. A. Bushaw, W. Nortershauser, Gordon W. F. Drake, H. J. Kluge Jan 2007

Ionization Energy Of Li 6,7 Determined By Triple-Resonance Laser Spectroscopy, B. A. Bushaw, W. Nortershauser, Gordon W. F. Drake, H. J. Kluge

Physics Publications

Rydberg level energies for Li7 were measured using triple-resonance laser excitation, followed by drifted field ionization. In addition to the principal n P2 series, weak Stark mixing from residual electric fields allowed observation of n S2 and hydrogenic Stark manifold series at higher n. Limit analyses for the series yield the spectroscopic ionization energy EI (Li7) =43 487.159 40 (18) cm-1. The Li 6,7 isotope shift (IS) was measured in selected n P2 Rydberg levels and extrapolation to the series limit yields IS (EI) 7,6 =18 067.54 (21) MHz. Results are compared with recent theoretical calculations: EI values from experiment …

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2007 Chesapeake Bay Bridge Tunnel Station Tide Prediction Calendars, Virginia Institute Of Marine Science, David A. Evans Jan 2007

2007 Chesapeake Bay Bridge Tunnel Station Tide Prediction Calendars, Virginia Institute Of Marine Science, David A. Evans

Miscellaneous

These calendars are produced monthly using David Evans' Tidecal.

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Forest Preservation, Minnesota State University, Mankato Jan 2007

Forest Preservation, Minnesota State University, Mankato

Conservation/Energy Alternatives

Bibliography and photographs of a display of government documents from Minnesota State University, Mankato.

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Looking At Alternatives, Minnesota State University, Mankato Jan 2007

Looking At Alternatives, Minnesota State University, Mankato

Conservation/Energy Alternatives

Bibliography and photographs of a display of government documents from Minnesota State University, Mankato.

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Xml Schema Matching, Jianguo Lu, Ju Wang, Shengrui Wang Jan 2007

Xml Schema Matching, Jianguo Lu, Ju Wang, Shengrui Wang

Computer Science Publications

XML Schema matching problem can be formulated as follows: given two XML Schemas, find the best mapping between the elements and attributes of the schemas, and the overall similarity between them. XML Schema matching is an important problem in data integration, schema evolution, and software reuse. This paper describes a matching system that can find accurate matches and scales to large XML Schemas with hundreds of nodes. In our system, XML Schemas are modeled as labeled and unordered trees, and the schema matching problem is turned into a tree matching problem. We proposed Approximate Common Structures in trees, and developed …

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