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Investigation into the effect of different fuels on ignition delay of M-type diesel combustion process
Dževad Bibić, Ivan Filipovič, Aleš Hribernik, Boran Pikula, 2008, original scientific article

Abstract: An ignition delay is a very complex process which depends on a great number of parameters. In practice, definition of the ignition delay is based on the use of correlation expressions. However, the correlation expressions have very often limited application field. This paper presents a new correlation which has been developed during the research project on the direct injection M-type diesel engine using both the diesel and biodiesel fuel, as well as different values of a static injection timing. A dynamic start of injection, as well as the ignition delay, is defined in two ways. The first approach is based on measurement of a needle lift, while the second is based on measurement of a fuel pressure before the injector. The latter approach requires calculation of pressure signals delay through the fuel injection system and the variation of a static advance injection angle changing. The start of a combustion and the end of the ignition delay is defined on the basis of measurements of an in-cylinder pressure and its point of separation from a skip-fire pressure trace. The developed correlation gives better prediction of the ignition delay definition for the M-type direct injection diesel engine in the case of diesel and biodiesel fuel use when compared with the classic expression by the other authors available in the literature.
Keywords: ignition delay, diesel engine, M-type, biodiesel
Published: 31.05.2012; Views: 1012; Downloads: 196
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Diophantine Steiner triples and Pythagorean-type triangles
Bojan Hvala, 2010, original scientific article

Abstract: V članku predstavimo povezavo med diofantskimi Steinerjevimi trojicami (trojicami naravnih števil, ki so povezane s konfiguracijo dveh disjunktnih krogov, od katerih večji vsebuje manjšega, pri kateri nastopi sklenjena Steinerjeva veriga) in trikotniki s celoštevilskimi stranicami in kotom 60°, 90° ali 120°. Dokažemo povezovalno formulo in jo geometrijsko interpretiramo.
Keywords: matematika, diofantske Steinerjeve trojice, Steinerjev porizem, pitagorejski trikotniki, trikotniki pitagorejskega tipa, mathematics, Diophantine Steiner triples, Steiner porism, Pythagorean triangles, Pythagorean-type triangles
Published: 10.07.2015; Views: 419; Downloads: 28
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Modal Meanings in Different Text Types in the Field of Logistics
Polona Vičič, 2016, doctoral dissertation

Abstract: The thesis sets out to investigate modality, which has been recognised as a central linguistic feature used for the expression of opinions and attitudes and thus also for establishing a dialogic relationship between the writer and reader. Following more recent, text-type oriented approaches to modality, which have recognised the importance of both genre- and discipline-specific conventions, the analysis aims to investigate modal verb use in different text types in logistics. Building on the finding that academic discourse is characterised by both objective (dynamic) and subjective (epistemic and deontic) presentation of claims it aims to establish to what extent the ratio between the two reflects genre- and discipline-specific use. The study is based on a combination of quantitative and qualitative (semantic) analysis, the results of which show that modal verb use in the analysed text types is characterised by a marked dichotomy between dynamic on the one side and epistemic and deontic use on the other, which, at least to some extent, could be related to the interdisciplinary nature of logistics. Furthermore, the analysed texts also show differences in the overall proportions of dynamic, epistemic and deontic use, which could be linked to the genre-specific style of each text type.
Keywords: modality, modal verbs, epistemic, deontic and dynamic meaning, text type, logistics
Published: 18.10.2016; Views: 747; Downloads: 61
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Education of older people for combating their loneliness
Jana Goriup, Branka Čagran, Katja Krošl, 2015, original scientific article

Abstract: The article discusses education of older people for combating their loneliness, the reasons for it, and its consequences. The current theoretical findings were the reason for the empirical study of the research problem by the authors. In the empirical part, some aspects of the life of older people regarding their residences were compared: among older people living with their relatives, alone, with a partner, or in a retirement home, with special regard to the reasons/causes for residence, and the feeling of loneliness and contacts with relatives. The obtained empirical results showed that older people living alone or in a retirement home are in a worse position compared to those living with relatives or with a partner. The most at risk are older people living alone.
Keywords: education, elder people, residence type, loneliness, contacts
Published: 29.03.2017; Views: 352; Downloads: 163
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Modelling of the risk factors and chronic diseases that influence the development of serious health complications
Maja Atanasijević-Kunc, Jože Drinovec, Simona Ručigaj, Aleš Mrhar, 2008, original scientific article

Abstract: Background: Some chronic diseases, like diabetes type 2 and hypertension, and risk factors, such as obesity, hypercholesterolemia, and smoking, are strongly correlated with the potential development of serious health complications that can threaten a patient's life or significantly influence the quality of life, while at the same time representing an enormous economic burden. Such complications include, for example, stroke, coronary heart disease, peripheralarterial vascular disease, end-stage renal disease and congestive heart failure. Methods: For a quantitative evaluation of the mentioned patient groups, the age distribution and an estimation of the treatment expenses a dynamic mathematical model was developed, where special attention was devoted to its structure, as it should enable the sequential construction and representation of different forms of data information. The model was realized in the Matlab program package with the Simulink Toolbox. Conclusions: A dynamic mathematical model is described that enables the observation of patients (in percentage terms) with diabetes type 2 and obesity, as well as those who smoke, have hypercholesterolemia and hypertension and all possible combinations of these problems, related to their age. Taking into account the Slovenian demographic data and annual treatment expenses, we were able to quantitatively evaluate these factors, not only in Slovenia but also in other developed regions where the demographic and economic situations are similar. It is also possible to extend the model to patients with serious complications, also taking into account the population dynamics, which is the goal of the next steps in our investigation. Regarding the presented results, it is estimated that from a group of a million people, those requiring treatment for diabetes type 2 cost as much as € 19.5 millions per year, since the treatment of one patient for one year is € 355. If all the sufferers requiring such treatment were located, as a consequence of more systematic medical examinations, an additional € 16 millions would be needed. In this group of one million people, as many as 40 % are expected to develop hypercholesterolemia, of which 26 % are diagnosed and treated adequately. The annual cost for the treatment of one patient is 313, which means that for a group of a million people the costs would be € 82 millions per year. An additional € 43.5 millions would be needed if all the sufferers with hypercholesterolemia were treated. Another chronic disease is hypertension. The annual cost for treating one patient is estimated to be € 271, and so for a group of a million people the treatment costs would be € 69.5 millions. If this were extended to include so far undiscovered sufferers with this chronic disease an additional € 14.5 millions would be needed.
Keywords: modelling, simulation, diabetes type 2, obesity, smoking, hypercholesterolemia, hypertension
Published: 28.03.2017; Views: 272; Downloads: 49
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Computational simulation of biaxial fatigue behaviour of lotus-type porous material
Janez Kramberger, Marko Šori, Matjaž Šraml, Srečko Glodež, 2016, original scientific article

Abstract: A computational simulation of low-cycle fatigue behaviour of lotus-type porous material, subjected to biaxial in-phase loading cycles is presented in this paper. Fatigue properties of porous materials are less frequently published in the literature. This paper evaluates computational analyses, where different pore distribution and biaxial loading conditions in relation to the pore orientations is considered in each simulation. The fatigue analysis is performed by using a damage initiation and evolution law based on the inelastic strain energy. The computational results are subjected to the appropriate statistical analysis, because of different pore topology a different fatigue lives are obtained on the same loading level. Results of computational simulations show also a qualitative understanding of porosity influence on low-cycle fatigue failures of lotus-type porous material under biaxial loading conditions.
Keywords: Lotus-type porous material, low-cycle fatigue, damage, finite element analysis
Published: 02.08.2017; Views: 291; Downloads: 218
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