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A study of particulate and gase-ous emissions of a damaged tubu-lar combustion chamber in a pellet stove
Zdravko Praunseis, 2021, izvirni znanstveni članek

Opis: Wood-burning boilers are a popular source of heating in Slovenia. However, there has been much debate about the potential negative health effects associated with wood smoke in recent years. Wood smoke is increasingly seen as a significant component of airborne particulate matter (PM), especially in the context of the new sort time standard for fine particles in ambient air. Most organic substances will be burnt in the boilers during good combustion conditions with sufficient oxygen supply and high temperature. This study presents the influence of damaged tubular combustion chamber on smoke fine-particle emissions at small scale pellet burners. This research aims to reduce the particulate matter emissions of small scale pellet boilers and contribute to cleaner air.
Ključne besede: particulate matter, small scale pellet boilers, combustion chamber, fine particle emission, pellet burner
Objavljeno v DKUM: 13.11.2023; Ogledov: 313; Prenosov: 7
.pdf Celotno besedilo (2,41 MB)
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Influence of undergarments on the comfort level of scoliosis brace wearers
O. Nagy Szabó, Jelka Geršak, A. Koleszár, Marianna Halász, 2023, izvirni znanstveni članek

Opis: Bracing has proven to be an effective method for the conventional treatment of scoliosis in young people. A brace, a therapeutic device, covers the upper body and promotes healing by applying pressure to specific areas. However, wearing a scoliosis brace negatively affects the user’s thermo-physiological well-being and often leads to discomfort. In this study, we investigated the influence of T-shirts as an undergarment on the thermo-physiological well-being of the brace wearer. For this purpose, we performed a comparative analysis of six T-shirts made from different special knitted fabrics. We carried out wearing tests in a computer-controlled climate chamber according to a predetermined protocol. The test subject wore the orthopedic brace over the different T-shirts at three different temperatures. The results indicate that the knitted fabrics of undergarments and environmental conditions considerably impact the wearer’s thermo-physiological comfort. In the tests, the T-shirts made from the selected functional fabrics performed very well. The T-shirt made from the classic cotton fabric containing elastane yarn also performed well and was the most environmentally friendly. Currently, due to its lower price and easier availability, this cotton T-shirt can be recommended for wearing under a scoliosis brace.
Ključne besede: clothing physiology, undergarment, knitted fabrics, scoliosis brace, climate chamber, textile material testing
Objavljeno v DKUM: 05.09.2023; Ogledov: 282; Prenosov: 21
.pdf Celotno besedilo (3,02 MB)
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Legal analysis of public authorities of Chamber for the Development of Slovenian Private Security - de lege lata and de lege ferenda
Iztok Rakar, Bojan Tičar, 2015, pregledni znanstveni članek

Opis: Purpose: This paper examines the development of delegation of public authorities to the Chamber for the Development of Slovenian Private Security. Based on an evaluation of past and present experiences, the authors set guidelines for future legal regulation and administrative practice. Design/Methods/Approach: The research presented here is based on an analysis of legal regulation and theory of public authorities, of the case law of the Constitutional Court of the Republic of Slovenia, and of the administrative inspection reports on implementation of public authorities of former Chamber of the Republic Slovenia for Private Security. Findings: Public authorities are institutes of Slovenian constitutional and administrative law. An analysis of sector-specific laws shows that a variety of administrative tasks is delegated to subjects of public and private law (e.g., public enterprises, chambers and individuals). In practice, the delegation of public authorities poses several major problems: ex ante, justifications of delegation are very vague and not supported by analyses, while ex post evaluations of delegation are non-existent and supervision of the implementation of public authorities is insufficient. In practice, supervision is mainly the result of malpractice as identified by random checks or the media, and not the result of systematic activity. The public authorities of professional chambers present a special problem. Public authorities of the former Chamber of the Republic Slovenia for Private Security pertaining to the licensing and professional supervision of members of the chamber have been withdrawn based on findings by administrative inspections. Research Limitations / Implications: The research is limited to Slovenia, but the findings are relevant for other “young democracies” in the region and of potential interest to Western European democracies. Originality/Value: The analysis addresses key problems in delegating and implementing public authorities, evaluates the results of experiences, and offers possible solutions.
Ključne besede: public authorities, private security, chamber, case law, constitutional court, Slovenia
Objavljeno v DKUM: 16.04.2020; Ogledov: 841; Prenosov: 38
.pdf Celotno besedilo (548,90 KB)
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Combustion simulation in the secondary chamber of a pilot-scale incinerator
Niko Samec, Filip Kokalj, Jyh-Yan Chen, 2007, izvirni znanstveni članek

Opis: A numerical analysis of combustion in the secondary chamber (thermoreactor) ofa two-stage pilot scale incinerator using computational fluid dynamics (CFD)is presented in detail. Various versions of the CFD program package CFX were used, which offer different combustion models for specific types and forms of combustion processes. The present study was focused on those physicalconditions that assure complete combustion, that is, temperature, residence time, and turbulent mixing. The selection of an appropriate combustion model was based on a comparison of the numerical results and experimental values of some combustion macro parameters in a thermoreactor. Combustion models based on one-step bimolecular chemical reaction and models based on multistep reactions were used. These models enabled a more detailed prediction of the combustion process in the secondary chamber of a pilot-scaleincinerator. The products of incomplete combustion that are significantly important for the designing and optimization of combustion devices can be predicted by applying multistep reaction models more accurately, especially in a transient regime of combustion.
Ključne besede: waste incineration, numerical modeling, combustion models, incinerator chamber, CFX, CFD, computational fluid dynamics
Objavljeno v DKUM: 31.05.2012; Ogledov: 2264; Prenosov: 82
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