1,612 research outputs found
Spiders (Araneae) of Chernivtsi City (Ukraine)
No full textThe spider fauna of buildings and other urban habitats (city parks, green areas of industrial enterprises, and housing estates) of Chernivtsi city was surveyed. In the period 2002-2011, 212 species belonging to 26 families were recorded. Previous studies found a total of 173 species of spiders belonging to 26 families from the territories which are now included in the city limits of Chernivtsi. Currently, the total spider species list for Chernivtsi includes 260 species of 30 families, of which 125 species (21 families) were recorded both by earlier researchers and by ourselves. The most important reasons for changes in urban spider assemblages are as follows: species habitat change, introduction of alien species, and description of new species unknown in the late 19th – early 20th centuries
Grand, Oklahoma Territory
No full textPhotograph of Grand, in the former Day County, Oklahoma Territory residences and businesses in the early 1900s. The residences are listed as (l to r): 1. Dr. O. C. Newman, 2. School house, 3. S. A. Miller, 4. Hi Walck and 5. Walck barn, 6. UNIDENTIFIED, 7. Jail, 8. UNIDENTIFIED, 9. Judge Alcorn, 10. Null and Wright offices, 11. Court House, 12. Sam Culp store, 13. Bank, 14. UNIDENTIFIED, 15. Shannon McCray, 16. Howlett store, and 17. Woodman's Hall
Newcomers to the Law Faculty (1970-71)
No full text(left to right) Ronald C. Brown, Richard E. Walck, Anthony J . Santoro, Gary L. Bahr, Tom A. Collins and Richard A. WilIiamsonhttps://scholarship.law.wm.edu/facultyphotos/1012/thumbnail.jp
IceCube-Gen2: A Vision for the Future of Neutrino Astronomy in Antarctica
No full text20 pages, 12 figures. Address correspondence to: E. Blaufuss, F. Halzen, C. Kopper (Changed to add one missing author, no other changes from initial version.)20 pages, 12 figures. Address correspondence to: E. Blaufuss, F. Halzen, C. Kopper (Changed to add one missing author, no other changes from initial version.)20 pages, 12 figures. Address correspondence to: E. Blaufuss, F. Halzen, C. Kopper (Changed to add one missing author, no other changes from initial version.)The recent observation by the IceCube neutrino observatory of an astrophysical flux of neutrinos represents the "first light" in the nascent field of neutrino astronomy. The observed diffuse neutrino flux seems to suggest a much larger level of hadronic activity in the non-thermal universe than previously thought and suggests a rich discovery potential for a larger neutrino observatory. This document presents a vision for an substantial expansion of the current IceCube detector, IceCube-Gen2, including the aim of instrumenting a volume of clear glacial ice at the South Pole to deliver substantial increases in the astrophysical neutrino sample for all flavors. A detector of this size would have a rich physics program with the goal to resolve the sources of these astrophysical neutrinos, discover GZK neutrinos, and be a leading observatory in future multi-messenger astronomy programs
On the circulatory apparatus of Mygale c\ue6mentaria, Walck
No full textVolume: 12Start Page: 72End Page: 7
The role of vab-1/Eph receptor during epidermal intercalation in C.elegans
No full textDuring C. elegans embryo genesis, dorsal intercalation occurs when epidermal cells exchange places with one another. In this study, we describe a role for Eph receptor--a receptor tyrosine kinase, known as VAB-1 in C. elegans--during the process of intercalation. The literature suggests that vab-1 is crucial for proper embryogenesis; however, no one has described vab-l's role in intercalation specifically. Here, I show that VAB-1 is necessary for intercalation and determine which regions of the VAB-1 protein are required for intercalation using a variety of characterized alleles within the vab-1 gene. Because Eph receptors are highly conserved, this research has implications for vertebrate processes that depend on cell intercalation, such as neural tube closure
Teleseismic Array Analysis of Upper Mantle Compressional Velocity Structure
No full textLarge quantities of teleseismic short-period seismograms recorded at SCARLET provide travel time, apparent velocity and waveform data for study of upper mantle compressional velocity structure. Relative array analysis of arrival times from distant (30° < Δ < 95°) earthquakes at all azimuths constrains lateral velocity variations beneath southern California. We compare dT/dΔ back azimuth and averaged arrival time estimates from the entire network for 154 events to the same parameters derived from small subsets of SCARLET. Patterns of mislocation vectors for over 100 overlapping subarrays delimit the spatial extent of an east-west striking, high-velocity anomaly beneath the Transverse Ranges. Thin lens analysis of the averaged arrival time differences, called 'net delay' data, requires the mean depth of the corresponding lens to be more than 100 km. Our results are consistent with the PKP-delay times of Hadley and Kanamori (1977), who first proposed the high-velocity feature, but we place the anomalous material at substantially greater depths than their 40-100 km estimate.
Detailed analysis of travel time, ray parameter and waveform data from 29 events occurring in the distance range 9° to 40° reveals the upper mantle structure beneath an oceanic ridge to depths of over 900 km. More than 1400 digital seismograms from earthquakes in Mexico and Central America yield 1753 travel times and 58 dT/dΔ measurements as well as high-quality, stable waveforms for investigation of the deep structure of the Gulf of California. The result of a travel time inversion with the tau method (Bessonova et al., 1976) is adjusted to fit the p(Δ) data, then further refined by incorporation of relative amplitude information through synthetic seismogram modeling. The application of a modified wave field continuation method (Clayton and McMechan, 1981) to the data with the final model confirms that GCA is consistent with the entire data set and also provides an estimate of the data resolution in velocity-depth space. We discover that the upper mantle under this spreading center has anomalously slow velocities to depths of 350 km, and place new constraints on the shape of the 660 km discontinuity.
Seismograms from 22 earthquakes along the northeast Pacific rim recorded in southern California form the data set for a comparative investigation of the upper mantle beneath the Cascade Ranges-Juan de Fuca region, an ocean-continent transit ion. These data consist of 853 seismograms (6° < Δ < 42°) which produce 1068 travel times and 40 ray parameter estimates. We use the spreading center model initially in synthetic seismogram modeling, and perturb GCA until the Cascade Ranges data are matched. Wave field continuation of both data sets with a common reference model confirms that real differences exist between the two suites of seismograms, implying lateral variation in the upper mantle. The ocean-continent transition model, CJF, features velocities from 200 and 350 km that are intermediate between GCA and T7 (Burdick and Helmberger, 1978), a model for the inland western United States. Models of continental shield regions (e.g., King and Calcagnile, 1976) have higher velocities in this depth range, but all four model types are similar below 400 km. This variation in rate of velocity increase with tectonic regime suggests an inverse relationship between velocity gradient and lithospheric age above 400 km depth.</p
Functional Programming in Learning Electromagnetic Theory
No full textElectromagnetic theory is central to physics. An undergraduate major in physics typically takes a semester or a year of electromagnetic theory as a junior or senior, and a graduate student in physics typically takes an additional semester or year at a more advanced level. In fall 2023, the author taught his undergraduate electricity and magnetism class using numerical methods in Haskell in parallel with traditional analytical methods. This article describes what functional programming has to offer to physics in general, and electromagnetic theory in particular. We give examples from vector calculus, the mathematical language in which electromagnetic theory is expressed, and electromagnetic theory itself.In Proceedings TFPIE 2024, arXiv:2407.0635
The Influence of Habitat on Body Temperature Regulation in the Timber Rattlesnake (Crotalus horridus)
No full textEctothermic vertebrates are dependent on the availability of environmental temperatures and their ability to behaviorally thermoregulate to maintain a suitable range of body temperatures. In heterogeneous landscapes, such organisms often will encounter a variety of habitat types which impose different environmental conditions for thermoregulation. This study examines the thermal qualities of different habitats within a heterogeneous landscape in Middle Tennessee and infers how this variation may influence body temperature regulation in a population of Crotalus horridus. Comparison of four habitats (field, cedar glade, hardwood forest, redcedar forest) indicated considerable variation in environmental temperatures. Nevertheless, C. horridus maintained similar body temperatures in all habitats despite the limited availability of suitable temperatures in the field and cedar glade. An index that assesses the effectiveness of thermoregulation was applied to each habitat and indicated high thermal quality in the hardwood forest and redcedar forest compared to the field and cedar glade. These findings imply that C. horridus would need to actively thermoregulate more in the field and cedar glade but could rely on thermoconforming behavior in the hardwood forest and redcedar forest. This study illustrates that different habitats may significantly influence the amount of effort a snake such as C. horridus may have to expend in order to thermoregulate and maintain appropriate body temperatures.M.S
DOES DIGESTION AFFECT THERMOREGULATION IN FREE-RANGING TIMBER RATTLESNAKES (CROTALUS HORRIDUS)?
No full textIncreasing body temperature (Tb) during digestion can facilitate localized biochemical reactions and consequently increase passage rate of food through the digestive tract in terrestrial ectotherms. Snakes, particularly infrequent feeders, may benefit from an increase in digestion rate, because they typically feed on relatively large prey, which substantially increases their body mass. There is considerable evidence, particularly from laboratory studies, that postprandial thermophily can be attained through behavioral thermoregulation. However, there are compelling reasons, such as increased predation risk, that some snake species may not choose warmer Tbs during digestion. This study examines thermoregulation, before and after feeding, in free-ranging telemetered timber rattlesnakes (Crotalus horridus), an infrequently-feeding snake in central Tennessee. Crotalus horridus were observed feeding naturally or offered large food items (laboratory rats weighing 30-50% of snake body mass). Continuous Tbs of 11 C. horridus were recorded during feeding events and indicated that limited postprandial thermophily occurred, but is unlikely to be biologically relevant. Additionally, the thermal microhabitats selected by C. horridus immediately prior to digestion, during digestion, and after digestion did not differ. This lack of increased thermal selection is counter to the hypothesis of postprandial thermophily, which is generally assumed for most snakes. Because C. horridus is an ambush predator, it may sacrifice warmer Tbs to conserve energy and/or to avoid detection. Additionally, the climate in central Tennessee may be adequately warm to facilitate digestion without the need for selection of specific sites.M.S
- …
