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Comparability of the biodynamic production system regarding agronomic, environmental and quality parameters
Matjaž Turinek, 2011, doktorska disertacija

Opis: Biodynamic (BD) agriculture became the subject of research efforts during the last decades, whereas a part of the scientific community looks at the BD method with skepticism and marks it as dogmatic. Summarized data of published research studies showed that further research is needed in the field of food quality comparison/determination, food safety and the environmental performance (e.g. foot prints). In this sense, yields, agronomic efficiency (AE) in relation to yields in some crops and the earthworm populations depending on those crops remain to be explored under the BD production system (PS). Therefore wheat, cabbage and oil pumpkins (rotation 1) and spelt, red beet and false flax (rotation 2) were produced in three successive years (2008-2010) under 4 PS (conventional (CON), integrated (INT), organic (ORG) and BD) + control plots in a field trial near Maribor, Slovenia. Earthworms were determined in rotation 1 in October 2009 and 2010 using the „hot“mustard-extraction method. Yields in the BD PS amounted to 99, 113 and 124 percent of the average yields of all PS for wheat, cabbage and oil pumpkin seeds, respectively. Also AE of N, Nmin, P and K of the BD system for the production of all crops studied in rotation 1 was in the upper half of all PS under investigation. Moreover, earthworm populations and biomass were highest and on a similar level in the BD and ORG systems in all three crops investigated, where most were found in oil pumpkins. In the second step the ecological footprint of PS under study was calculated for wheat and spelt production and interpreted using the SPIonExcel tool. Three-year results show a markedly lower ecological footprint of the ORG and BD systems in production of both crops, mainly due to non-use of external production factors. When yields are added to the equation, the ORG and BD systems also have a lower overall footprint per product unit and ecological efficiency of production. Thus, ORG and BD systems present viable alternatives in facing environmental degradation and climate change in cereal production. However, room for improvement exists in the area of machinery use in all systems studied and yield improvement in the ORG farming system. Moreover, the importance of food quality has increased, but there remains a lack of research in this field, including sensory quality. Thus, in the third step, yields and sensory properties of white cabbage and red beet were examined in 2008 and 2009. Yields did not differ significantly among PS. A total of 167 consumers scored four attributes (color, odor, taste, and willingness to buy) using a nine-point hedonic scale. Results show significant differences between PS for both crops, where INT and control cabbage was preferred over CON cabbage samples (BD and ORG in-between), whereas BD and control red beet was preferred over CON and INT samples (ORG in-between). Lastly, the contents of sugars, organic acids, total phenolic content and the antioxidant activity were quantified in the flesh of red beet samples from 2009 using established methods. Significant differences were measured for malic acid, total phenolic content (TPC) and total antioxidant activity, where malic acid content ranged from 2.39 g kg-1 FW (control) to 1.63 g kg-1 FW (CON, ORG and INT). Highest TPC was measured in BD and control samples (0.677 and 0.672 mg GAE g-1, respectively), lowest in CON samples (0.511 mg GAE g-1). Antioxidant activity was positively correlated with TPC (r2=0.6187) and ranged from 0.823 µM TE g-1 FW to 1.270 µM TE g-1 FW in CON and BD samples, respectively, whereas total sugar content ranged from 21.03 g kg-1 FW (CON) to 31.58 g kg-1 FW (BD). The importance of the measured constituents for human health, as well as for plant resilience and health is discussed and put into perspective. Thus, the BD PS presents a viable alternative to the nowadays predominant CON and INT PS for the production of the studied crops under the Slovene subcontinental temperate climate.
Ključne besede: biodynamic farming, agronomic efficiency, earthworms, ecological footprint, sensory quality, chemical composition
Objavljeno: 31.03.2011; Ogledov: 4136; Prenosov: 514
.pdf Celotno besedilo (1,03 MB)

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Hygiene monitoring systems for hospital textile laundering
Sabina Fijan, Sonja Šostar-Turk, 2007, strokovni članek

Opis: The main aim of washing laundry is to remove soils and microorganisms from infected and dirty textiles and achieve clean, fresh and disinfected textiles ready for use. Textiles undergo laundering processes, which include: soil removal with special laundering agents; bleaching; disinfecting; and finally neutralising and rinsing. Because textiles from hospitals may contain many kinds of pathogenic -bacteria, fungi and viruses, it is essential that the laundering process has not only a cleaning effect but also an antimicrobial one. Since users of hospital textiles are often patients with a weakened immune -system, it is recommended that best practice and common sense be employed when washing and -disinfecting hospital textiles. Most people assume that the laundry returned to them is in fact clean and, therefore, safe. Experience encourages all infection control teams to take laundering very seriously. (1-15) Inappropriately disinfected textiles are one of the possible sources of nosocomial infections for patients. There are reports of hospital textiles being the source of nosocomial infection with streptococci, enterococci, Bacillus cereus, staphylococci and coliforms.(5-9) There are some documented cases where staff in hospital wards and laundries have been infected with scabies, fungi, salmonellas, gastroenteritis viruses, hepatitis A viruses and coxiellas after treating dirty laundry.
Ključne besede: textile care, hospital laundry, laundry hygiene, micro-organisms, washing quality parameters, sanitary microbiological parameters, hospital-acquired disease prevention, sanitary measures
Objavljeno: 31.05.2012; Ogledov: 1745; Prenosov: 18
URL Povezava na celotno besedilo

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Properties of UV-cured pigment prints on textile fabric
Branko Neral, Sonja Šostar-Turk, Bojana Vončina, 2006, izvirni znanstveni članek

Opis: This paper studies and evaluates the UV-curing of pigment prints on textile fabric using a prototype UV scanner. A printing paste comprising synthetic thickener, emulgator, binder, pigment dispersion and photoinitiator was applied using a flat screen printing technique onto the cotton fabric, then dried and exposed to heat or UV-radiation under a mercury vapour lamp (200 W cm-2). The characteristics of cured prints such as paste add-on, colour properties, colour fastness to washing and dryžwet rubbing were evaluated, together with fabric stiffness. The effects of UV-curing were evaluated by Attenuated Total Reflectance Fourier transform infrared spectroscopy (ATR-FTIR). The properties of the UV-cured pigment prints were compared with those of the thermal cured prints. Analyses of the obtained results helped to define the optimum composition of the photo reactive pigment paste, and the UV-curing conditions under which satisfactory results were obtained, comparable with those from the thermal curing method.
Ključne besede: textiles, textile printing, printing quality, pigment dispersion, UV-curing, binder, photoinitiator
Objavljeno: 30.05.2012; Ogledov: 1323; Prenosov: 58
URL Povezava na celotno besedilo

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Fuzzy logic based quality monitoring in short-circuit gas metal arc welding
Marjan Golob, Arpad Köveš, 2007, izvirni znanstveni članek

Opis: Conventional methods, e.g. destructive and non-destructive testing methods, are expensive and time-consuming; therefore, possibilities of online and automated quality control of a welding process during welding as such are investigated. The paper deals with the possibilities of application of fuzzy logic to the analysis of weld quality, particularly assessment of the weld surface condition by means of measurable electric signals emitted during welding. A simple fuzzy inference system was realised which could relatively efficiently assess the weld quality on the basis of time variations of the welding voltage and short-circuit time in a certain time window.
Ključne besede: fuzzy systems, fuzzy logic, gas metal arc welding, GMAW, quality monitoring, statistical analysis, quality control, weld quality
Objavljeno: 31.05.2012; Ogledov: 958; Prenosov: 55
URL Povezava na celotno besedilo

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QoS-oriented design of embedded systems with specification PEARL
Roman Gumzej, Wolfgang A. Halang, 2007, izvirni znanstveni članek

Opis: Only recently have methodical tools adequate to design real-time systems been formally introduced in design methodologies. Naturally, they were present fromthe beginning, but due to the large diversity of embedded systemsć areas of deployment, specially dedicated formalisms have been developed and used. High-level language programming and integration of modeling formalisms into design methods eased the development of more complex real-time applications. With the emerging object-oriented programming languages and design methods, their integration into larger information systems has become more transparent. It was the UML methodology, however, which eventually merged also the design methods and concepts of real-time systems into a consistent whole. It took a large consortium and a long process to persuade industry of the benefits the new integral methodology can offer. On the other hand, there are some trade-offs, and there are some features not completely covered, yet. Here, a different, more straightforward approach to program and design (embedded) real-time systems is presented. Since it emerged from the real-time community, it includes most features relevant there. Independent of the UML profile for schedulability, performance and time specification, a profile was devised for use in PEARL-oriented UML design. The strengths of the mentioned language and design methods for QoS-oriented design of (embedded) real-time systems are emphasised throughout this article.
Ključne besede: real time systems, embedded systems, quality of service, co-design, co-simulation, safety, dependability, security, timeliness, determinism, readiness, reliability, portability, flexibility, specification PEARL, UML profiles, patterns
Objavljeno: 31.05.2012; Ogledov: 1523; Prenosov: 47
URL Povezava na celotno besedilo

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The ecological motivation or tourists as a determinant of the tourists' loyalty
Majda Bastič, Slavka Gojčič, 2011, objavljeni znanstveni prispevek na konferenci

Opis: Despite the significant impact of environment on the attractiveness of tourist destination, environmental stewardship is not always the top priority in the hotel industry as one of the most energy-intensive sectors of the tourism industry which contributes to the increasing quantity of air pollutants. Therefore, this study investigates the impact of ecological pull motives and service quality on the tourists' loyalty to eco-hotels. The tourists spent their holidays in Austrian hotels with ecolabel and in Slovenian hotels were targeted and a total of 611 tourists participated in the study. The study reveals that the perceived service quality and ecobehaviour of hotel staff are the main determinants of the tourists' loyalty. The comparison analysis between Austrian and Slovenian hotels indicates that the guests of Austrian hotels with ecolabel are more loyal and ecologically motivated than guests of Slovenian hotels without ecolabel.
Ključne besede: loyalty, ecological motivation, hotel service quality, tourism, eco-tourism, hotels, services, quality
Objavljeno: 30.05.2012; Ogledov: 1485; Prenosov: 48
.pdf Celotno besedilo (240,04 KB)
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