33,011 research outputs found
Letter from A. F. Potter to John H. Page
No full textLetter from A. F. Potter to John H. Page referring his request to build a railway to the District Forester at Albuquerque, New Mexico
Polly H. Carder Collection on George F. Root
No full textGeorge Frederick Root (1820-1895) was an American songwriter and music educator. He is perhaps best known for his song "The Battle Cry of Freedom," which was written and rose to popularity during the U.S. Civil War. The Polly H. Carder Collection on George F. Root contains original published scores and songbooks from the period 1852-1907 and photocopied scores collected by Polly H. Carder, author of the book George F. Root, Civil War Songwriter: A Biography. The collection also contains a short article, "The Last Days of George F. Root," written by Root's daughter, Clara Louise Burnham
Figure 1. Parathelges foliatus Markham, 1972 in New records of two species of parasitic isopods (Isopoda: Cymothoida: Bopyridae: Athelginae) associated with hermit crabs from the south Atlantic
No full textFigure 1. Parathelges foliatus Markham, 1972 (UFRGS 5970): (A) habitus dorsal view; (B) habitus ventral view; (C) antennula; (D) antenna; (E) barbula; (F) maxilliped; (G) oostegite 1; (H) pereopod 1; (I) pereopod 7. Scale bars: A and B = 5 mm; C = 0.1 mm; D and G = 0.5 mm; E = 0.1 mm; F, K and L = 1.00 mm; H = 0.3 mm; I = 1.5 mm.Published as part of Ribeiro, Felipe Bezerra, Campos-Filho, Ivanklin Soares & Bezerra, Luís Ernesto Arruda, 2019, New records of two species of parasitic isopods (Isopoda: Cymothoida: Bopyridae: Athelginae) associated with hermit crabs from the south Atlantic, pp. 1-7 in Papéis Avulsos de Zoologia 59 on page 3, DOI: 10.11606/1807-0205/2019.59.37, http://zenodo.org/record/463740
Karst dissolution along fracture corridors in an anticline hinge, Jandaíra Formation, Brazil: Implications for reservoir quality
No full textFolded, fractured, and karstified structures have been recognized in several carbonate reservoirs. However, they are rarely fully identified from seismic or well data and have been poorly described. The present study investigates the geological and structural controls that regional anticlines may exert on solution-enlarged fracture corridors and epigenic karst concentrations in folded-fractured carbonate units. We performed regional mapping based on 106 2D seismic lines, 51 well logs, unmanned aerial vehicle (UAV) imagery of four major outcrop sites (I, II, III and IV) and field investigations to parameterize fracture and karstic features (density, spacing, length, and aperture). The study area is Potiguar Basin, Brazil, where we identified the gentle NE-trending Apodi fold, ~10 km wide and ~20 km long. The fold formed along an inverted extensional fault during the latest Miocene-Quaternary stress field, and the envelope of the meandering trend of the Apodi River coincides with the NE-trending fold axis. The fracture pattern in the fold hinge zone consists of two orthogonal, syn-folding fracture sets: a NE-SW-striking hinge-parallel set and an orthogonal NW-SE-striking set. These fractures and superposed karstification are mostly concentrated in the hinge zone along fracture corridors in an area 1.5 km wide and 20 km long. We conclude that fracture corridors in anticline hinges are likely sites to have high fracture densities and wide apertures. These corridors provide reservoir spaces that are favorable for the formation of karst cavities, with significant increases in permeability and porosity along the fracture sets. These features act as important fluid pathways and storage areas where matrix porosity is low. The findings can be used for first-order prediction in karstified carbonate reservoirs
Subsidence rings and fracture pattern around dolines in carbonate platforms – Implications for evolution and petrophysical properties of collapse structures
No full textThis work focuses on the study of collapse dolines, which are the most expressive collapse structures in carbonate rocks, and their relations with preexisting and syn-collapse fractures. The study area has two fracture sets that were formed before folding, early N-S/E-W- and late NE-SW/NW-SE-striking sets, which concentrate most of the dissolution in the region and allow the formation of the dolines. We define subsidence rings as the circular and ellipsoidal concentric zones around collapse structures, which are subjected to subsidence due to major collapses and represent locations where new fractures are formed. In these subsidence rings, the downfaulted topography plunges towards the doline center and reaches more than 10 m in relation to unaffected areas away from dolines. The topographic data indicate that the mean radius of the combined rings is ~twice the radius of the collapse, which corresponds to the closed depression due to failure and downfall of blocks. The subsidence process enlarges, links preexisting fractures, and forms a new set of semicircular concentric opening mode fractures, here named collapse fractures. Increases in the apertures and densities of these fractures occur towards the dolines, which increases fracture porosity around collapse structures. Fractures are reactivated as normal faults close to the main collapse at the doline edge. This increase in fracture intensity could represent an indicator of permo-porous quality improvement in these areas. Further, this fracturing increases structural instability, raising the risk of accidents in areas built on soluble carbonate rocks, since the affected area may be much larger than previously predicted. Subsidence rings around collapse dolines could merge with other rings from neighboring collapse structures and potentially increase porosity and permeability, as well as linking areas in carbonate reservoirs
Electron and positron scattering from 1,1-C₂H₂F₂
No full text1,1-difluoroethylene (1,1-C₂H₂F₂) molecules have been studied for the first time experimentally and theoretically by electron and positron impact. 0.4-1000 eV electron and 0.2-1000 eV positron impact total cross sections (TCSs) were measured using a retarding potential time-of-flight apparatus. In order to probe the resonances observed in the electron TCSs, a crossed-beam method was used to investigate vibrational excitation cross sections over the energy range of 1.3-49 eV and scattering angles 90 degrees and 120 degrees for the two loss energies 0.115 and 0.381 eV corresponding to the dominant C-H (ν₂ and ν₉) stretching and the combined C-F (ν₃) stretching and CH₂ (ν₁₁) rocking vibrations, respectively. Electron impact elastic integral cross sections are also reported for calculations carried out using the Schwinger multichannel method with pseudopotentials for the energy range from 0.5 to 50 eV in the static-exchange approximation and from 0.5 to 20 eV in the static-exchange plus polarization approximation. Resonance peaks observed centered at about 2.3, 6.5, and 16 eV in the TCSs have been shown to be mainly due to the vibrational and elastic channels, and assigned to the B₂, B₁, and A₁ symmetries, respectively. The pi* resonance peak at 1.8 eV in C₂H₄ is observed shifted to 2.3 eV in 1,1-C₂H₂F₂ and to 2.5 eV in C₂F₄; a phenomenon attributed to the decreasing C=C bond length from C₂H₄ to C₂F₄. For positron impact a conspicuous peak is observed below the positronium formation threshold at about 1 eV, and other less pronounced ones centered at about 5 and 20 eV.The work was supported in part by a Grant-in-Aid, the
Ministry of Education, Science, Technology, Sport and Culture,
Japan, the Japan Society for the Promotion of Science
JSPS, and the Japan Atomic Energy Research Institute
JAERI. One of the authors C.M. is also grateful to the
JSPS for financial support under Grant No. P04064. Another
author H.T. acknowledges Dr. T. Ozeki of the JAERI for
his encouragement and support during this work. This work
was also done under the International Atomic Energy Agency
IAEA project for three of the authors C.M., M.H., and
H.T.. Two of the authors M.H.F.B. and M.A.P.L. acknowledge
support from the Brazilian agency Conselho Nacional
de Desenvolvimento Científico e Tecnológico CNPq.
MHFB also acknowledges support from the Paraná state
agency Fundação Araucária and from FINEP ( under Project
No. CT-Infra 1)
„f“ AND „h“ LETTERS\u27 PROBLEM IN LATGALIAN LANGUAGE
No full textIn the article is told about the problem of letters’ (and sounds’) f and h in Latgalian language. These sounds have never been in any Latgalian dialect, in foreign words speakers always have been replaced them with other sounds. At the same time letters f and h have been used in written Latgalian at all times: from the first known book „Evangelia toto anno“ to the present day. What to do in this situation: to keep the way of the still alive traditional spoken language, or to yield to the pressure of other languages?The author analyzes a variety of sources: tells about reconstructions of source languages and opinions of their researchers about presence/absence of these sounds in them, deals with f in contemporary Eurasian languages (Eastern Slavic: Russian, Ukrainian, Belarusian; Finnic: Finnish, Estonian, Vyru; Turkic: Kyrgyz, Kazakh, Chuvash, Yakut; Persian: Pashto; Baltic: Lithuanian, Samogitian) and h in contemporary Eurasian languages (French, Kazakh, Lithuanian, Samogitian). Latgalian and Latvian dialects’ recordings, folk songs, ancient texts (from XVI–XVIII centuries), as well as Latgalian contemporary literature are analyzed. The author also evaluates inclusion of letters f and h in alphabet of the official Latgalian terms of spelling in year 2007.Author establishes that there are five possible paths:1) to use the f and h in all the words where they are in Latvian, Russian or other languages;2) to keep p, k, g and c in traditionally used words, but to put f and h in newly borrowed ones;3) do not use the f and h at all;4) to use both variants parallely in the same words;5) to write f and h, but to pronounce them as p and k.Author concludes that the actualy usable are only two of them: the second one – the way of a compromise, and the third one – as the most appropriate to Latgalian phonological system
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
FIGURE 1. Myrceugenia bananalensis. A. General view. B in A new species of Myrceugenia (Myrteae, Myrtaceae) from Distrito Federal, Brazil, with notes on its micromorphology
No full textFIGURE 1. Myrceugenia bananalensis. A. General view. B. Detail of branch vestiture. C. Inflorescense: frontal view. D. Flower bud. E. Open flower: frontal view. F. Petal detail showing glands. G–H. Anther details: frontal and dorsal views. I. Petal and calyx lobe details. J. Tetralocular ovary. K. Fruit and persistent bracteole. (K.M. Gomes-Bezerra & J.E.Q. Faria 31).Published as part of Gomes-Bezerra, Kadja M., Faria, Jair E.Q., Landrum, Leslie R. & Silva, Lucia Helena Soares-, 2014, A new species of Myrceugenia (Myrteae, Myrtaceae) from Distrito Federal, Brazil, with notes on its micromorphology, pp. 37-43 in Phytotaxa 183 (1) on page 39, DOI: 10.11646/phytotaxa.183.1.4, http://zenodo.org/record/515048
IR-IR DOUBLE RESONANCE EXPERIMENT OF CHF-(-H) CLUSTERS IN SOLID -H
No full textAuthor Institution: Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka Okayama 700-8530 JAPAN; Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551 JAPANFTIR absorption spectrum of the \nu vibrational band of CHF in solid -H shows a series of lines at regular intervals, which could be assigned to clusters forming CHF-(-H), with n = 0 to 12 nderline{119}, 4731(2003)}. However, such a distinct feature appears only in the \nu mode but is not observed in the other vibrational modes. In order to solve this problem, we applied IR-IR double resonance spectroscopy using 3 m OPO laser and 9 m QC laser to the vibrational bands of CHF in solid -H. Because, very recently, high resolution cw-QC laser spectroscopy demonstrated a perfect bleaching effect on a spectral peak in \nu mode, nderline{13}, 11587 (2011)}. By bleaching the n=1 component of the \nu band at 9 m, we can see a corresponding depletion in the broad spectral feature of the \nu band at 3 m. This simultaneous disappearance of the spectral peaks is a proof of the CHF-(-H) cluster model, and it suggests that all the vibrational bands should be explained by the same model
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