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Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory
Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, A. Aab, 2016, izvirni znanstveni članek

Opis: The azimuthal asymmetry in the risetime of signals in Auger surface detector stations is a source of information on shower development. The azimuthal asymmetry is due to a combination of the longitudinal evolution of the shower and geometrical effects related to the angles of incidence of the particles into the detectors. The magnitude of the effect depends upon the zenith angle and state of development of the shower and thus provides a novel observable, (secθ)max, sensitive to the mass composition of cosmic rays above 3×1018  eV. By comparing measurements with predictions from shower simulations, we find for both of our adopted models of hadronic physics (QGSJETII-04 and EPOS-LHC) an indication that the mean cosmic-ray mass increases slowly with energy, as has been inferred from other studies. However, the mass estimates are dependent on the shower model and on the range of distance from the shower core selected. Thus the method has uncovered further deficiencies in our understanding of shower modeling that must be resolved before the mass composition can be inferred from (secθ)max.
Najdeno v: osebi
Ključne besede: ultra-high energy cosmic rays (UHECR), UHECR mass composition, Pierre Auger Observatory, extensive air showers, Auger Surface Detector signals risetime, azimuthal symmetry
Objavljeno: 15.04.2016; Ogledov: 3959; Prenosov: 0
.pdf Polno besedilo (698,19 KB)

Mass composition of ultra-high energy cosmic rays at the Pierre Auger Observatory
Gašper Kukec Mezek, 2019, doktorska disertacija

Opis: Cosmic rays with energies above 10^18 eV, usually referred to as ultra-high energy cosmic rays (UHECR), have been a mystery from the moment they have been discovered. Although we have now more information on their extragalactic origin, their direct sources still remain hidden due to deviations caused by galactic magnetic fields. Another mystery, apart from their production sites, is their nature. Their mass composition, still uncertain at these energies, would give us a better understanding on their production, acceleration, propagation and capacity to produce extensive air showers in the Earth's atmosphere. Mass composition studies of UHECR try to determine their nature from the difference in development of their extensive air showers. In this work, observational parameters from the hybrid detection system of the Pierre Auger Observatory are used in a multivariate analysis to obtain the mass composition of UHECR. The multivariate analysis (MVA) approach combines a number of mass composition sensitive variables and tries to improve the separation between different UHECR particle masses. Simulated distributions of different primary particles are fitted to measured observable distributions in order to determine individual elemental fractions of the composition. When including observables from the surface detector, we find a discrepancy in the estimated mass composition between a mixed simulation sample and the Pierre Auger data. Our analysis results from the Pierre Auger data are to a great degree independent on hadronic interaction models. Although they differ at higher primary masses, the different models are more consistent, when combining fractions of oxygen and iron. Compared to previously published results, the systematic uncertainty from hadronic interaction models is roughly four times smaller. Our analysis reports a predominantly heavy composition of UHECR, with more than a 50% fraction of oxygen and iron at low energies. The composition is then becoming heavier with increasing energy, with a fraction of oxygen and iron above 80% at the highest energies.
Najdeno v: osebi
Ključne besede: astroparticle physics, ultra-high energy cosmic rays, extensive air showers, mass composition, Pierre Auger Observatory, machine learning, multivariate analysis
Objavljeno: 03.04.2019; Ogledov: 2830; Prenosov: 133
.pdf Polno besedilo (17,53 MB)

Izboljšanje energijske bilance v proizvodnem obratu kamnoloma
Andrej Lavrenčič, 2011, magistrsko delo

Najdeno v: osebi
Ključne besede: magistrske naloge, kamnolomi, energijske bilance, zmanjševanje stroškov, stroški energije
Objavljeno: 15.10.2013; Ogledov: 4960; Prenosov: 356
URL Polno besedilo (0,00 KB)
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Vodenje prometa ob izrednem dogodku na avtocesti
Andrej Odar, 2012, diplomsko delo

Najdeno v: osebi
Ključne besede: promet, predori, varnost, izredni dogodki, obveščanje, koordinacija, signalizacija, reševanje, diplomske naloge
Objavljeno: 15.10.2013; Ogledov: 4992; Prenosov: 404
URL Polno besedilo (0,00 KB)
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Geoinformatic methods for the detection of former waste disposal sites in karstic and nonkarstic regions
Mateja Breg Valjavec, 2012, doktorska disertacija

Najdeno v: osebi
Ključne besede: jame, vrtače, gramoznice, odlagališča odpadkov, geoinformatika, disertacije
Objavljeno: 15.10.2013; Ogledov: 4286; Prenosov: 68
URL Polno besedilo (0,00 KB)
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Jelena Ćalić, 2009, doktorska disertacija

Najdeno v: osebi
Ključne besede: kras, površinska morfologija, uvala, geografski informacijski sistem, disertacije
Objavljeno: 15.10.2013; Ogledov: 4554; Prenosov: 75
URL Polno besedilo (0,00 KB)
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Vulnerability and risk mapping for the protection of Karst waters in Slovenia
Nataša Ravbar, 2007, doktorska disertacija

Najdeno v: osebi
Ključne besede: vodonosniki, sledilni poizkusi, monitoring, kamnine, upornost, vodni viri, zaščita, upravljanje, disertacije
Objavljeno: 15.10.2013; Ogledov: 4509; Prenosov: 221
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Povijest poznavanja Dinarskog krša na primjeru Popova polja
Ivo Lučić, 2009, doktorska disertacija

Najdeno v: osebi
Objavljeno: 19.02.2015; Ogledov: 3579; Prenosov: 187
.pdf Polno besedilo (8,33 MB)
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The cultural importance of karst and caves
Luiz Eduardo Panisset Travassos, 2011, doktorska disertacija

Najdeno v: osebi
Ključne besede: karst, cultural heritage
Objavljeno: 19.02.2015; Ogledov: 4112; Prenosov: 168
.pdf Polno besedilo (31,43 MB)
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Managing karst in Coastal British Columbia, Canada
Paul Andre Griffiths, 2020, doktorska disertacija

Opis: This thesis provides a detailed description and analysis of the system used for managing karst in the forests of coastal British Columbia (BC), where the major land- use activity is industrial forestry. In 2004, BC shifted from a more prescriptive forest management model (the Forest Practices Code) to a less regulated, results-based approach based primarily on the Forest and Range Practices Act (FRPA). The dissertation examines how this results-based management approach for forest resources has worked – or not worked – with respect to karst. The research focused on the five key realms of an environmental management system as defined by the International Standards Organization (ISO 14001 standard): 1) Legislation and Policy, 2) Planning, 3) Implementation, 4) Checking/Corrective Action, and 5) Management Review. The research also examined the roles of professional reliance (another major foundational element of the FRPA model), karst research, and organizational capacity as external factors which influence on the functioning of the karst management system. A combination of interviews, surveys, document reviews and field observations were used to collect qualitative information relevant to all aspects of the karst management system. This research reveals inadequacies in all five realms of BC’s current karst management framework, including gaps in legislation, a lack of implementation of existing standards and guidelines, and non-existent effectiveness and compliance monitoring. The results suggest that BC’s shift to ‘self-regulation’ has yielded unsatisfactory results so far for karst resources and has hindered progress toward implementing a fully integrated science-based ecosystem approach to karst management in the study area. Professional reliance failures are identified as one of the key factors contributing to a breakdown of the management system for karst. This is the first comprehensive study that examines the systems and processes used for managing karst in coastal BC, and consolidates knowledge for government, industry, and others that wish to study or better understand BC’s approach and methods for managing karst. The findings will be useful for private and public forest sector organizations endeavoring to implement fully-functional and effective systems for managing karst in a forestry context. This information may also have more specific applications for managing karst.
Najdeno v: osebi
Ključne besede: karst ecosystems, protection and management, legislation, policies, standards and guidelines, environmental degradation, forestry impacts, professional reliance, British Columbia, Canada
Objavljeno: 02.03.2020; Ogledov: 2074; Prenosov: 34
.pdf Polno besedilo (136,27 MB)

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