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Articles 285871 - 285900 of 303797
Full-Text Articles in Physical Sciences and Mathematics
Uranium-Series Age Of The Eel Point Terrace, San Clemente Island, California, D. R. Muhs, B. J. Szabo
Uranium-Series Age Of The Eel Point Terrace, San Clemente Island, California, D. R. Muhs, B. J. Szabo
United States Geological Survey: Staff Publications
Uranium-series analysis of the coral Allopora californica Verrill from the 2nd, 32-m Eel Point terrace on San Clemente Island, California, has yielded an age of 127,000 ± 7,000 yr. The Eel Point terrace is thus correlative with numerous terrace localities on the southern California mainland, with coral reefs on Barbados and New Guinea dated about 120,000 yr, and with substage 5e of the marine oxygen-isotope record. A tectonic uplift rate of about 0.20 m/1,000 yr has been calculated assuming a sea level slightly higher than the present one at the time of terrace formation. Extrapolation of this uplift rate allows …
Aftershocks Of The Coyote Lake, California, Earthquake Of August 6, 1979' A Detailed Study, P. Reasenberg, W. L. Ellsworth
Aftershocks Of The Coyote Lake, California, Earthquake Of August 6, 1979' A Detailed Study, P. Reasenberg, W. L. Ellsworth
United States Geological Survey: Staff Publications
Aftershock hypocenters and focal mechanism solutions for the Coyote Lake, California, earthquake reveal a geometrically complex fault structure, consisting of multiples lip surfaces. The faulting surface principally consists of two right stepping en echelon, northwest trending, partially overlapping, nearly vertical sheets and is similar in geometry to a slip surface inferred for the 1966 Parkfield, California, earthquake. The overlap occurs near a prominent bend in the surface trace of the Calaveras fault at San Felipe Lake. Slip during the main rupture, as inferred from the distribution of early aftershocks, appears to have been confined to a 14-km portion of the …
New Plesiadapiform Primates From The Eocene Of Wyoming And Montana, Kenneth D. Rose, Thomas M. Bown
New Plesiadapiform Primates From The Eocene Of Wyoming And Montana, Kenneth D. Rose, Thomas M. Bown
United States Geological Survey: Staff Publications
Several recently discovered fossil specimens add to our knowledge of plesiadapiform primates.
Diatom Biostratigraphy And Paleoecology Of The Type Section Of The Luisian Stage, Central California, Jack G. Baldauf, John A. Barron
Diatom Biostratigraphy And Paleoecology Of The Type Section Of The Luisian Stage, Central California, Jack G. Baldauf, John A. Barron
United States Geological Survey: Staff Publications
Diatoms from the type section of the Luisian Stage in central California correlate with the lowermost part of the Denticulopsis lauta Zone through the lower part of subzone "a" of the Denticulopsis hustedtii –D. lauta Zone and are early Middle Miocene in age (about 16.0 to 14.0 Ma}. Rocks assigned to the Luisian Stage by benthic foraminifers elsewhere in California exhibit little diachroneity in terms of diatom biostratigraphy; however, detailed studies of boundaries have not been done. Planktic diatoms dominate the assemblages, although an increase in benthic and tychopelagic diatoms in the overlying Hames Member of the Monterey Formation probably …
Distribution, Movement, And Temperature Selection Of Adult Walleye And Muskellunge In A Power Plant Cooling Reservoir, Jerry A. Younk
Distribution, Movement, And Temperature Selection Of Adult Walleye And Muskellunge In A Power Plant Cooling Reservoir, Jerry A. Younk
Electronic Theses and Dissertations
Distribution and habitat selection of five adult walleyes (Stizostedion vitreum vitreum) and one adult muskellunge (Esox masquinongy), in a power plant cooling reservoir, were determined using temperature-sensitive ultrasonic transmitters, A total of 342 locations were obtained during the monitoring period (1 May-13 November 1981). Walleyes exhibited a seasonal distribution pattern; inhabiting the discharge area during the cooler months and the intake area during the warmer months, Summer-fall home ranges of three walleyes were estimated, Maximum home ranges (maximum area covered by an individual) were overlapping and similar in size, ranging from 36, 7-45, 9 ha, Estimates of utilized areas (intensively …
Fault Coverage Requirement In Production Testing Of Lsi Circuits, Vishwani D. Agrawal, Sharad C. Seth, Prathima Agrawal
Fault Coverage Requirement In Production Testing Of Lsi Circuits, Vishwani D. Agrawal, Sharad C. Seth, Prathima Agrawal
School of Computing: Faculty Publications
A technique is described for evaluating the effectiveness of production tests for large scale integrated (LSI) circuit chips. It is based on a model for the distribution of faults on a chip. The model requires two parameters, the average number (n0) of faults on a faulty chip and the yield (y) of good chips. It is assumed that the yield either is known or can be calculated from the available formulas. The other parameter, n0, is determined from an experimental procedure. Once the model is fully characterized, it allows calculation of the field …
Absolute Theory Of Relativity & Parameterized Special Theory Of Relativity & Noninertial Multirelativity, Florentin Smarandache
Absolute Theory Of Relativity & Parameterized Special Theory Of Relativity & Noninertial Multirelativity, Florentin Smarandache
Branch Mathematics and Statistics Faculty and Staff Publications
In this book we present our 1972 hypothesis that there is no speed barrier in the universe and one can construct arbitrary speeds -
thus refuting the speed of light postulate.
While Einstein considered a relative space and relative time but the ultimate speed
of light, we do the opposite: we consider an absolute time and absolute space but no
ultimate speed, and we call it the Absolute Theory of Relativity (ATR). The ATR has no time dilation, no length contraction, no relativity of simultaneity, and no relativistic paradoxes.
We then parameterize Einstein’s thought experiment with atomic clocks,
supposing that …
Results On Periodic Solutions Of Parabolic Equations Suggested By Elliptic Theory, Alfonso Castro, A. C. Lazer
Results On Periodic Solutions Of Parabolic Equations Suggested By Elliptic Theory, Alfonso Castro, A. C. Lazer
All HMC Faculty Publications and Research
No abstract provided.
Reduction Methods Via Minimax, Alfonso Castro
Reduction Methods Via Minimax, Alfonso Castro
All HMC Faculty Publications and Research
Lecture notes in mathematics originally published in Differential Equations book series.
On Multiple Solutions Of Nonlinear Elliptic Equations With Odd Nonlinearities, Alfonso Castro, J. V. A. Gonçalves
On Multiple Solutions Of Nonlinear Elliptic Equations With Odd Nonlinearities, Alfonso Castro, J. V. A. Gonçalves
All HMC Faculty Publications and Research
In this paper we stablish results on multiplicity of solutions for the boundary value problem where a e IR and f: R - IR is an odd continuous function.
Rearrangeable Networks With Limited Depth, Nicholas Pippenger, Andrew C.-C. Yao
Rearrangeable Networks With Limited Depth, Nicholas Pippenger, Andrew C.-C. Yao
All HMC Faculty Publications and Research
Rearrangeable networks are switching systems capable of establishing simultaneous independent communication paths in accordance with any one-to-one correspondence between their n inputs and n outputs. Classical results show that Ω( n log n ) switches are necessary and that O( n log n ) switches are sufficient for such networks. We are interested in the minimum possible number of switches in rearrangeable networks in which the depth (the length of the longest path from an input to an output) is at most k, where k is fixed as n increases. We show that Ω( n1 + 1/k ) switches …
Some Properties Of Positive Derivations On F-Rings, Melvin Henriksen, Frank A. Smith
Some Properties Of Positive Derivations On F-Rings, Melvin Henriksen, Frank A. Smith
All HMC Faculty Publications and Research
Throughout A denotes an f-ring; that is, a lattice-ordered ring that is a subdirect union of totally ordered rings. We let D(A) denote the set of derivations D: A --> A such that a ≥ 0 implies Da ≥ 0, and we call such derivations positive. In [CDK], P. Coleville, G. Davis, and K. Keimel initiated a study of positive derivations on f-rings. Their main results are (i) D ε D(A) and A archimedean imply D = 0, and (ii) if A has an identity element 1 and a is the supremum of a set …
Restoring Natural Conditions In A Boreal Forest Park, Glen F. Cole
Restoring Natural Conditions In A Boreal Forest Park, Glen F. Cole
United States National Park Service: Publications
Voyageurs National Park is located in northern Minnesota (Figure 1). Its northern and eastern boundaries parallel a historic fur trade route that influenced the location of the boundary between the United States and Canada. About two-thirds of the park's 344-square-mile (891 km2) area is land, and the remainder is made up of numerous small and large lakes. The interspersion of forested land, massive rock outcrops and lakes make the park very scenic. It is also somewhat unique because it is the only U.S. park on the mainland in a southern boreal forest region. Isle Royale National Park is …
Management Of Roosevelt Elk Habitat And Harvest, E. E. Starkey, D. S. Decalesta, G. W. Witmer
Management Of Roosevelt Elk Habitat And Harvest, E. E. Starkey, D. S. Decalesta, G. W. Witmer
United States National Park Service: Publications
Historically, Roosevelt elk (Cervus elaphus roosevelti) were distributed from northern California to southern British Columbia in the coastal Pacific Northwest. During the Pleistocene, the subspecies was isolated reproductively from the Rocky Mountain elk (C. e. nelsoni) to the east by the Cascade Mountain Range and by glaciation (Guthrie 1966). Thus Roosevelt elk have adapted to relatively moist forest habitats with maritime climates, while Rocky Mountain elk evolved under the continental climate of the interior.
Unfortunately, less is known of Roosevelt elk biology than of the closely related Rocky Mountain elk east of the Cascades. This has …
An Approximation Theory For Conjugate Surfaces And Solutions Of Elliptic Multiple Integral Problems: Application To Numerical Solutions Of Generalized Laplace's Equation, John Gregory, Ralph W. Wilkerson
An Approximation Theory For Conjugate Surfaces And Solutions Of Elliptic Multiple Integral Problems: Application To Numerical Solutions Of Generalized Laplace's Equation, John Gregory, Ralph W. Wilkerson
Computer Science Faculty Research & Creative Works
An Approximation Theory is Given for a Class of Elliptic Quadratic Forms Which Include the Study of Conjugate Surfaces for Elliptic Multiple Integral Problems. These Ideas Follow from the Quadratic Form Theory of Hestenes, Applied to Multiple Integral Problems by Dennemeyer, and Extended with Applications for Approximation Problems by Gregory. the Application of This Theory to a Variety of Approximation Problem Areas in This Setting is Given. These Include Conjugate Surfaces and Conjugate Solutions in the Calculus of Variations, Oscillation Problems for Elliptic Partial Differential Equations, Eigenvalue Problems for Compact Operators, Numerical Approximation Problems, And, Finally, the Intersection of These …
Preparation Of Cationic Polymer Surfaces By Grafting Polymerization, H. Yasuda, B. Sherry, M. A. Ei‐Nokaly, Stig Friberg
Preparation Of Cationic Polymer Surfaces By Grafting Polymerization, H. Yasuda, B. Sherry, M. A. Ei‐Nokaly, Stig Friberg
Chemistry Faculty Research & Creative Works
A cationic polymer surface with extensive capacity for adsorption of anionic surfactants was prepared by graft polymerization of vinyl pyridine onto a plasma‐treated polypropylene surface. The nitrogen was quaternized in order to obtain the cationic sites. The concentration dependence of adsorption from high eletrolyte solution of the anionic surfactant was similar to the one a solid surface from solutions with no added electrolyte. The hydrophobic contribution to the adsorption was experienced at surfactant concentrations far below its critical micellization. Copyright © 1982 John Wiley & Sons, Inc.
Glacial Geology And Stratigraphy Of Southeastern Pierce And Southwestern Benson Counties, North Dakota, Arthur W. Schnacke Jr.
Glacial Geology And Stratigraphy Of Southeastern Pierce And Southwestern Benson Counties, North Dakota, Arthur W. Schnacke Jr.
Theses and Dissertations
The study area includes 220 square miles in southeastern Pierce and southwestern Benson Counties, North Dakota (T. 152 N. through T. 154 N., R. 70 W. through R. 73 W.).
,
Field mapping and subsequent analyses were attempted to differentiate the drifts of the Leeds and Souris lobes, to determine the sequence and duration of events during and subsequent to glaciation, and to aid in correlating the drifts. Landforms of the area include: ice marginal ridges, ground moraine, proglacial plains, abandoned river channels, and sand dunes.
In the laboratory, very coarse sand lithology percentages, till fabric, texture, and gross lithology …
Depositional Environments And Sandstone Diagenesis In The Tyler Formation (Pennsylvanian), Southwestern North Dakota, Stephen D. Sturm
Depositional Environments And Sandstone Diagenesis In The Tyler Formation (Pennsylvanian), Southwestern North Dakota, Stephen D. Sturm
Theses and Dissertations
The Tyler Formation, of Early Pennsylvanian age, in southwestern North Dakota may be divided into upper and lower units, reflecting both a change in lithology and depositional environments. The lower unit is dominated by varicolored, noncalcareous shales and mudstones, siltstones, thin coal beds, and medium-grained sandstones. The upper unit in the areas of the Square Butte to Fryburg fields may be divided into a lower subunit, dominated by dark gray to grayish-black, argillaceous limestones and calcareous shales, and an upper subunit dominated by grayish-red, anhydritic limestones, varicolored to reddish-brown, calcareous shales, and locally, thin anhydrite. In the area of the …
Analysis Of Petroleum Source Rocks Of The Bakken Formation (Devonian And Mississippian) In North Dakota, Rick L. Webster
Analysis Of Petroleum Source Rocks Of The Bakken Formation (Devonian And Mississippian) In North Dakota, Rick L. Webster
Theses and Dissertations
The Bakken Formation of North Dakota consists of upper and lower, black, organic-rich shales separated by a calcareous siltstone middle member. The formation is a relatively thin unit (maximum thickness of 145 feet) with the lower shale .attaining a maximum thickness of 50 feet and the upper shale a maximum thickness of 23 feet. The shales are hard, siliceous, pyritic, fissile, and noncalcareous. They contain abundant conodonts and tasmanites and have planar laminations accented by pyrite. The upper and lower shales were apparently deposited in an offshore, marine, anoxic environment where anoxic conditions may have been caused by silling of …
Petrology And Alteration In The Core Of The Bear Lodge Tertiary Intrusive Complex, Bear Lodge Mountains, Crook County, Wyoming, Michael Wilkinson
Petrology And Alteration In The Core Of The Bear Lodge Tertiary Intrusive Complex, Bear Lodge Mountains, Crook County, Wyoming, Michael Wilkinson
Theses and Dissertations
The Bear Lodge complex is an elongate, dome-shape uplift about 8.5 km long by 4 km wide, 10 km northwest of Sundance, Wyoming. The study area is centered about Warren Peaks and includes approximately 23 km2. The igneous intrusive core of the complex is mostly alkali trachyte but latite is abundant in the southern portion of the complex. Phonolite, pseudoleucite trachyte porphyry, and carbonatite dikes cut across the core. Precambrian granitic rocks and lower Paleozoic sedi mentary rocks flank the intrusion and occur as xenoliths.
The latite is relatively unaltered and consists mostly of oligo clase, andesine, alkali feldspar, salite, …
Petrology, Geochemistry And Economic Geology Of Selected Gold Claims In Rocks Of The Wasekwan Lake Area, Lynn Lake District, Manitoba, Canada, Douglas Scott Kenaley
Petrology, Geochemistry And Economic Geology Of Selected Gold Claims In Rocks Of The Wasekwan Lake Area, Lynn Lake District, Manitoba, Canada, Douglas Scott Kenaley
Theses and Dissertations
The purpose of this investigation was to map and study, both at regional and detailed scales, the units encountered within seven gold claims that were staked by Sherritt-Gordon Mines Limited of Lynn Lake, Manitoba. The claims are located in the wasekwan Lake area, approximately 12. 8 km southeast of Lynn Lake. Regional mapping was conducted at a scale of 1:12000 over a 6.4 km2 area and detailed mapping of potentially economic areas was conducted at a scale of 1:240. Whole-rock geochemistry, microprobe, optical and X-ray diffraction procedures were employed to describe and characterize the rocks. The Aphebian rock units of …
Depositional Environment And Diagenesis, Birdbear Formation (Upper Devonian) Williston Basin, North Dakota, Peter T. Loeffler
Depositional Environment And Diagenesis, Birdbear Formation (Upper Devonian) Williston Basin, North Dakota, Peter T. Loeffler
Theses and Dissertations
The Birdbear Formation is a subsurface unit that is present throughout North Dakota except where truncated by post-depositional erosion. An angular unconformity is present between the Birdbear and younger strata in areas where the Three Forks Formation does not overlie the Birdbear. An isopach map of the Birdbear, constructed from drill-hole log data, indicates that the formation generally thickens gradually from the erosional limit to a maximum of 119 feet north of the center of the Basin. A structure map o~ the top of the Birdbear shows a basin that reaches 9000 feet below sea level.
The Birdbear is predominantly …
A Precision Measurement Of The Lifetime Of The Positive Muon, Kevin Louis Giovanetti
A Precision Measurement Of The Lifetime Of The Positive Muon, Kevin Louis Giovanetti
Dissertations, Theses, and Masters Projects
In an experiment performed at TRIUMF Laboratory, the time distribution of muon decay positrons arising from pions stopped in a water Cherenkov counter was measured with a high precision timing system. The pions served as a source of positive muons.;The data were used to determine a new value for the positive muon lifetime. This lifetime 2.19695 (+OR-) .00006 (sec) is slightly lower than previous measurements but still in fair agreement. The data were tested for the various systematic effects that typically occur in these measurements.
International Ultraviolet Explorer Observations Of The Aquarii Jet, A. G. Michalitsianos, Menas Kafatos
International Ultraviolet Explorer Observations Of The Aquarii Jet, A. G. Michalitsianos, Menas Kafatos
Mathematics, Physics, and Computer Science Faculty Articles and Research
Ultraviolet spectra were obtained with the International Ultraviolet Explorer of the newly discovered optical-radio jet feature in the symbiotic variable R Aquarii. The far-UV continuum of the jet is characterized by strong continuum which rises with decreasing wavelength in the 1200-2000 A wavelength range and is considerably different in appearance from the relatively flat continuum exhibited by ionized nebulosity in the central star. Prominent Si III] and Si II emission lines seen in the central region are virtually absent in the jet. This could reflect the depletion of silicon in the feature, the result of grain formation in material that …
Iue Observations Of The Peculiar Star Rx Puppis, Menas Kafatos, A. G. Michalitsianos, W. A. Feibelman
Iue Observations Of The Peculiar Star Rx Puppis, Menas Kafatos, A. G. Michalitsianos, W. A. Feibelman
Mathematics, Physics, and Computer Science Faculty Articles and Research
We have obtained the first high-dispersion observations of RX Pup in the wavelength region 1200-2000 A with the International Ultraviolet Explorer. RX Pup has been classified a symbiotic star and has been compared to slow novae as well as to 11 Carinae. The anomalies that we observed in high-excitation lines in RX Pup such as He II, 0 III], C III], C IV, and Si IIIl that show split line profiles, Doppler displaced multiple components, and possible inverse P Cygni profiles inN III] and N IV J suggest dynamic activity in circumstellar material that probably has the form of rings …
Wave Refraction By Warm Core Rings, George R. Mapp
Wave Refraction By Warm Core Rings, George R. Mapp
Dissertations, Theses, and Masters Projects
No abstract provided.
Zooplankton Communities In Chesapeake Bay Seagrass Systems, Cathy Elizabeth Meyer
Zooplankton Communities In Chesapeake Bay Seagrass Systems, Cathy Elizabeth Meyer
Dissertations, Theses, and Masters Projects
No abstract provided.
Waterfowl Utilization Of A Submerged Vegetation (Zostera Marina And Ruppia Maritima) Bed In The Lower Chesapeake Bay, Elizabeth W. Wilkins
Waterfowl Utilization Of A Submerged Vegetation (Zostera Marina And Ruppia Maritima) Bed In The Lower Chesapeake Bay, Elizabeth W. Wilkins
Dissertations, Theses, and Masters Projects
No abstract provided.
The Distribution And Ecology Of Gammaridean Amphipods In The Plankton Of The Middle Atlantic Bight, Cathy J. Womack
The Distribution And Ecology Of Gammaridean Amphipods In The Plankton Of The Middle Atlantic Bight, Cathy J. Womack
Dissertations, Theses, and Masters Projects
No abstract provided.
Life History And Management Of Spiny Dogfish, Squalus Acanthias, Off The Northeastern United States, Marta Nammack
Life History And Management Of Spiny Dogfish, Squalus Acanthias, Off The Northeastern United States, Marta Nammack
Dissertations, Theses, and Masters Projects
No abstract provided.