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749 Matching Results
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The Surface Detector System of the Pierre Auger Observatory
None
Date:
November 1, 2007
Creator:
Allekotte, I.; Barbosa, A.F.; Bauleo, P.; Bonifazi, C.; Civit, B.; Escobar, C.O. et al.
Object Type:
Article
System:
The UNT Digital Library
The Pierre Auger project
The Pierre Auger project is a broadly based international effort to make a detailed study of cosmic rays at the highest energies. Two air shower detectors are proposed, one to be placed in the Northern Hemisphere and one in the Southern Hemisphere. Each installation will consist of an array of 1600 particle detectors spread over 3000 km{sup 2} with a solid angle acceptance of 2 sr for cosmic ray air showers. Eah installation will also have an atmospheric fluorescence detector viewing the volume above the surface array. These two air shower detector techniques working together form a powerful instrument for the proposed research. The objectives of the Pierre Auger project are to measure the arrival direction, energy, and mass composition of 60 events per year above an energy of 10{sup 20} eV and 6000 events per year above 10{sup 19} eV. A collaboration is now being formed with the goal of having the Pierre Auger observatory in operation by 2001.
Date:
January 1, 1996
Creator:
Mantsch, P.M.
Object Type:
Article
System:
The UNT Digital Library
The Surface Detector System of the Pierre Auger Observatory
The Pierre Auger Observatory is designed to study cosmic rays with energies greater than 10{sup 19} eV. Two sites are envisaged for the observatory, one in each hemisphere, for complete sky coverage. The southern site of the Auger Observatory, now approaching completion in Mendoza, Argentina, features an array of 1600 water-Cherenkov surface detector stations covering 3000 km{sup 2}, together with 24 fluorescence telescopes to record the air shower cascades produced by these particles. The two complementary detector techniques together with the large collecting area form a powerful instrument for these studies. Although construction is not yet complete, the Auger Observatory has been taking data stably since January 2004 and the first physics results are being published. In this paper we describe the design features and technical characteristics of the surface detector stations of the Pierre Auger Observatory.
Date:
November 1, 2007
Creator:
Allekotte, I.; Barbosa, A.F.; Bauleo, P.; Bonifazi, C.; Civit, B.; Escobar, C.O. et al.
Object Type:
Article
System:
The UNT Digital Library
Neutron activation analysis of thin orange pottery
The evidence thus far obtained supports the idea of ''Thin Orange'' ware, typical of classic Teotihuacan culture, easily identifiable petrographically or chemically, not necessarily made at Teotihuacan itself but widely traded, and ''thin, orange'' pottery, fabricated in many other places, and perhaps at other times as well.
Date:
January 1, 1976
Creator:
Harbottle, G; Sayre, E V & Abascal, R
Object Type:
Article
System:
The UNT Digital Library
Report on the CEPA activities [Consorcio Educativo para la Proteccion Ambiental/Educational Consortium for Environmental Preservation] [Final report of activities from 1998 to 2002]
This report compiles the instances of scientific, educational, and institutional cooperation on environmental issues and other activities in which CEPA was engaged during the past five years, and includes several annual reports and meeting summaries. CEPA is a collaborative international consortium that brings together higher education institutions with governmental agencies, research laboratories, and private sector entities. CEPA's mission is to strengthen the technical, professional, and educational environmental infrastructure in the United States and Latin America. The CEPA program includes curriculum development, student exchange, faculty development, and creation of educational materials, joint research, and other cooperative activities. CEPA's goals are accomplished by actively working with Hispanic-serving institutions of higher education in the United States, in collaboration with institutions of higher education in Latin America and other Consortium members to deliver competitive environmental programs.
Date:
February 1, 2003
Creator:
Cruz, Miriam
Object Type:
Report
System:
The UNT Digital Library
American Flag. (Matamoros, Tamaulipas, Mexico), Vol. 2, No. 129, Ed. 1 Wednesday, September 1, 1847
Triweekly newspaper from United States-occupied Matamoros, Mexico that includes local and national news from the United States and Mexico, especially concerning the Mexican War. Also includes advertising.
Date:
September 1, 1847
Creator:
Fleeson, Isaac Neville & Palmer, J. R.
Object Type:
Newspaper
System:
The Portal to Texas History
The Fourth Write (San Antonio, Tex.), Vol. 3, No. 3, Ed. 1 Friday, May 1, 1970
Student magazine from San Antonio College in San Antonio, Texas that includes works by journalism students along with advertising.
Date:
May 1, 1970
Creator:
San Antonio College
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
El Paso Morning Times (El Paso, Tex.), Vol. 38TH YEAR, Ed. 1, Saturday, December 1, 1917
Daily newspaper from El Paso, Texas that includes local, state and national news along with extensive advertising.
Date:
December 1, 1917
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Drumright Evening Derrick (Drumright, Okla.), Vol. 5, No. 265, Ed. 1 Monday, December 1, 1919
Daily newspaper from Drumright, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 1, 1919
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
OU Daily (Norman, Okla.), Vol. 101, No. 28, Ed. 1 Thursday, December 1, 2016
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 1, 2016
Creator:
Branham, Dana
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
South Texas Catholic (Corpus Christi, Tex.), Vol. 27, No. 18, Ed. 1 Friday, May 1, 1992
Weekly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date:
May 1, 1992
Creator:
Graywolf, Lucas & Ramon, Rachelle
Object Type:
Newspaper
System:
The Portal to Texas History
The State Gazette. (Austin, Tex.), Vol. 14, No. 48, Ed. 1 Wednesday, July 1, 1863
Weekly newspaper from Austin, Texas that includes local, state and national news along with extensive advertising.
Date:
July 1, 1863
Creator:
Richardson, D.
Object Type:
Newspaper
System:
The Portal to Texas History
El Paso Morning Times (El Paso, Tex.), Vol. 38TH YEAR, Ed. 1, Wednesday, May 1, 1918
Daily newspaper from El Paso, Texas that includes local, state and national news along with extensive advertising.
Date:
May 1, 1918
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
La Prensa. (San Antonio, Tex.), Vol. 1, No. 12, Ed. 1 Thursday, May 1, 1913
Weekly Spanish-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
May 1, 1913
Creator:
Lozano, Ignacio E.
Object Type:
Newspaper
System:
The Portal to Texas History
Measurement of the Depth of Maximum of Extensive Air Showers above 10^18 eV
We describe the measurement of the depth of maximum, X{sub max}, of the longitudinal development of air showers induced by cosmic rays. Almost 4000 events above 10{sup 18} eV observed by the fluorescence detector of the Pierre Auger Observatory in coincidence with at least one surface detector station are selected for the analysis. The average shower maximum was found to evolve with energy at a rate of (106{sub -21}{sup +35}) g/cm{sup 2}/decade below 10{sup 18.24 {+-} 0.05}eV, and (24 {+-} 3) g/cm{sup 2}/decade above this energy. The measured shower-to-shower fluctuations decrease from about 55 to 26 g/cm{sup 2}. The interpretation of these results in terms of the cosmic ray mass composition is briefly discussed.
Date:
February 1, 2010
Creator:
Abraham, J.; Abreu, P.; Aglietta, M.; Ahn, E. J.; Allard, D.; Allekotte, I. et al.
Object Type:
Article
System:
The UNT Digital Library
La Prensa (San Antonio, Tex.), Vol. 6, No. 1817, Ed. 1 Sunday, February 1, 1920
Daily Spanish-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
February 1, 1920
Creator:
Lozano, Ignacio E.
Object Type:
Newspaper
System:
The Portal to Texas History
El Paso Morning Times (El Paso, Tex.), Vol. 35TH YEAR, Ed. 1, Friday, January 1, 1915
Daily newspaper from El Paso, Texas that includes local, state and national news along with extensive advertising.
Date:
January 1, 1915
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Fourth Write (San Antonio, Tex.), Vol. 4, No. 1, Ed. 1 Tuesday, December 1, 1970
Student magazine from San Antonio College in San Antonio, Texas that includes works by journalism students along with advertising.
Date:
December 1, 1970
Creator:
San Antonio College
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
American Flag. (Matamoros, Tamaulipas, Mexico), Vol. 2, No. 178, Ed. 1 Wednesday, March 1, 1848
Triweekly newspaper from United States-occupied Matamoros, Mexico that includes local and national news from the United States and Mexico, especially concerning the Mexican War. Also includes advertising.
Date:
March 1, 1848
Creator:
Fleeson, Isaac Neville & Palmer, J. R.
Object Type:
Newspaper
System:
The Portal to Texas History
ONSET OF CHAOS IN A MODEL OF QUANTUM COMPUTATION
Recently, the question of a relevance of the so-called quantum chaos has been raised in applications to quantum computation [2,3]. Indeed, according to the general approach to closed systems of finite number of interacting Fermi-particles (see, e.g. [4,5]), with an increase of an interaction between qubits a kind of chaos is expected to emerge in the energy spectra and structure of many-body states. Specifically, the fluctuations of energy levels and components of the eigenstates turn out to be very strong and described by the Random Matrix Theory. Clearly, if this happens in a quantum computer, it may lead to a destruction of the coherence of quantum computations due to internal decoherence inside many-body states. It is important to stress that quantum chaos occurs not only in the systems with random interaction, but also for purely dynamical interaction. In the latter case, the mechanism of chaos is due to a complex (non-linear) form of a two-body interaction represented in the basis of non-interacting particles. Numerical analysis [2] of a simplest model of quantum computer (2D model of 1/2-spins with a random interqubit interaction J) shows that with an increase of the number L of qubits, the chaos threshold J{sub cr} decreases …
Date:
February 1, 2001
Creator:
BERMAN, G. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 82, No. 195, Ed. 1 Thursday, May 1, 1997
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 1, 1997
Creator:
Diehl, Don
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
La Prensa (San Antonio, Tex.), Vol. 6, No. 1604, Ed. 1 Tuesday, July 1, 1919
Daily Spanish-language newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
July 1, 1919
Creator:
Lozano, Ignacio E.
Object Type:
Newspaper
System:
The Portal to Texas History
Carney Enterprise. (Carney, Okla.), Vol. 9, No. 49, Ed. 1 Friday, July 1, 1910
Weekly newspaper from Carney, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 1, 1910
Creator:
Herbert, H. S.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Anisotropy studies around the Galactic Centre at EeV energies with the Auger Observatory
Data from the Pierre Auger Observatory are analyzed to search for anisotropies near the direction of the Galactic Centre at EeV energies. The exposure of the surface array in this part of the sky is already significantly larger than that of the fore-runner experiments. Our results do not support previous findings of localized excesses in the AGASA and SUGAR data. We set an upper bound on a point-like flux of cosmic rays arriving from the Galactic Centre which excludes several scenarios predicting sources of EeV neutrons from Sagittarius A. Also the events detected simultaneously by the surface and fluorescence detectors (the ''hybrid'' data set), which have better pointing accuracy but are less numerous than those of the surface array alone, do not show any significant localized excess from this direction.
Date:
July 1, 2006
Creator:
Aglietta, M.; Aguirre, C.; Allard, D.; Allekotte, I.; Allison, P.; Alvarez, C. et al.
Object Type:
Article
System:
The UNT Digital Library