65 research outputs found
Towards integrated digital twins for construction and manufacturing
No full textA digital twin (DT) can enhance construction management with comprehensive real-time simulations. However, research rarely considers prefabrication factories, whose processes have a significant impact on cost and duration. It remains unclear how construction DTs can achieve their expected benefits without dynamically interacting with the DTs of manufacturing facilities. To address this, a DT integration model is proposed. It builds upon systems theory and describes integration across the three layers objectives, processes, and data & tools. A theoretical example demonstrates potential benefits of integrated DTs. This work can assist researchers and practitioners who are focusing on DTs in the execution phase.Design & Construction ManagementIntegral Design & Managemen
The Expressiveness of Music
No full textThe paper deals with the relationship between the art of music and human emotions, in particular, with the feature of musical works designated in aesthetic literature as „expressiveness“. After a short presentation of several main attempts at explaining the expressiveness of music in analytical aesthetics, the author offers a clarification of the conceptual confusion within presented theories, and points out their main difficulties and deficiencies
Web3-based role and token data access: the case of building material passports
No full textLong-term access to lifecycle data is key to a successful transition towards a circular built environment. However, the underlying technology often remains centralized and risks becoming inaccessible over time. In this paper, we investigate whether decentralized access methods using Web3, i.e. blockchain and decentralized data storage protocols, can help to mitigate this limitation. We implement Web3 data access mechanisms for a material passport with both a role-based and a token-based smart contract. Initial results suggest that Web3 offers a promising approach to data access over the lifecycle of a built asset-but only with careful design choices.Integral Design & ManagementDesign & Construction Managemen
The Expressiveness of Music
No full textThe paper deals with the relationship between the art of music and human emotions, in particular, with the feature of musical works designated in aesthetic literature as „expressiveness“. After a short presentation of several main attempts at explaining the expressiveness of music in analytical aesthetics, the author offers a clarification of the conceptual confusion within presented theories, and points out their main difficulties and deficiencies
Aesthetic Criteria in the Evaluation of Scientific Theories: Transition from Geocentrism to Heliocentrism
No full textThe text focuses on the role of aesthetic criteria in the evaluation and acceptance of scientific theories. The first part of the text presents and analyzes the theory of James McAllister. McAllister explains the role of aesthetic criteria in science by appealing to aesthetic induction: based on the empirical success of previously accepted scientific theories, scientists project aesthetic value onto certain properties of those theories, such as simplicity, symmetry, the possibility of visualization, etc. McAllister cites the transition from geocentrism to heliocentrism as a case study in the history of science that supports this phenomenon. After presenting and analyzing McAllister’s theory, the author presents several objections both to the explanation of the transition to heliocentrism through aesthetic induction, and to the more general understanding of the formation of aesthetic criteria in scientific practice
Nutritional habits of subjects with Type 2 diabetes mellitus in the Mediterranean Basin: comparison with the non-diabetic population and the dietary recommendations. Multi-Centre Study of the Mediterranean Group for the Study of Diabetes (MGSD)
No full textAims/hypothesis. The aim of this study was to compare the nutritional habits of Type 2 diabetic patients among Mediterranean countries and also with those of their background population and with the nutritional recommendations of the Diabetes and Nutrition Study Group. Methods. We did a cross-sectional study of 1833 non-diabetic subjects and 1895 patients with Type 2 diabetes, in nine centres in six Mediterranean countries. A dietary questionnaire validated against the 3-Day Diet Diary was used. Results. In diabetic patients the contribution of proteins, carbohydrates and fat to the energy intake varied greatly among centres, ranging from 17.6% to 21.0% for protein, from 37.7% to 53.0% for carbohydrates and from 27.2% to 40.8% for fat, following in every centre the trends of the non-diabetic population. Furthermore, diabetic patients compared to the corresponding background population had: (i) lower energy intake, (ii) lower carbohydrate and higher protein contribution to the energy intake, (iii) higher prevalence of obesity, ranging from 9 to 50%. The adherence to the nutritional recommendations for proteins, carbohydrate and fat was very low ranging from 1.4 to 23.6%, and still decreased when fibre was also considered. Conclusion/interpretation. In diabetic patients of the Mediterranean area: (i) dietary habits vary greatly among countries, according to the same trends of the background population; (ii) the prevalence of obesity is much lower than the 80% reported for patients with diabetes in Western countries; (iii) Carbohydrate intake is decreased with a complementary increase of protein and fat consumption, resulting to a poor compliance with the nutritional recommendations
A study of high-frequency properties of plasma and the influence of electromagnetic radiation from IR to XUV
No full textOn the basis of calculated values for the conductivity in an external
electric field, we determined the high-frequency characteristics of plasmas
under extreme conditions (e. g. dense plasma focus device). The examined
range of frequencies covers the IR, visible, UV, XUV up to X regions and the
considered electronic number density and temperature are in the ranges of
1021 cm-3 ? Ne ? 5?1024 cm-3 and 2?104 K ? T ? 106 K, respectively. The data
obtained using this method are important for plasma focus research,
laboratory plasma research, investigation of atmosphere plasmas of
astrophysical objects like white dwarfs with different atmospheric
compositions.</jats:p
Variable temperature in situ X-ray diffraction study of mechanically activated synthesis of calcium titanate, CaTiO3
No full textThe effect of mechanical activation on formation of calcium titanate (CaTiO3) from calcined mixtures of CaCO3 and TiO2 was studied by monitoring the course of this solid-state reaction by variable temperature in situ X-ray diffraction (XRD) experiments, scanning electron microscopy (SEM) and dilatometry. Two equimolar mixtures of powdered CaCO3 and TiO2 were prepared: one was mechanically activated by grinding in a high energy vibro-mill. A total of 32 X-ray diffraction data sets for each sample, collected between 30 and 1100 degreesC, were analyzed by multiphase Rietveld refinement. Quantitative phase analysis and microstructure analysis obtained from X-ray diffraction are correlated to results of scanning electron microscopy and dilatometry. In the non-activated sample, small quantities of the reactants remain in the product until 1100 degreesC. In the activated sample, the reaction results in pure CaTiO3 at 920 degreesC. (C) 2003 Elsevier Science Ltd. All fights reserved
Cardiorenal syndrome type 1: Definition, etiopathogenesis, diagnostics and treatment
No full text© 2018, University of Kragujevac, Faculty of Science. All rights reserved. Cardiorenal Syndrome Type 1 (CRS-1) is defi ned as an acute worsening of heart function leading to acute kidney injury and/or dysfunction. It is an important cause of hospitalization which aff ects the diagnosis as well as the prognosis and treatment of patients. Th e purpose of this paper is to analyze causes that lead to the development of cardiorenal syndrome type 1 and its clinical consequences, as well as to emphasize the clinical importance of its early detection. Th e clinical studies and professional papers dealing with etiopathogenesis, diagnosis and treatment of cardiorenal syndrome type 1, have been analyzed. Th e most important role in the occurrence of cardio renal syndrome type 1 is played by hemodynamic mechanisms, activation of neurohumoral systems, infl ammation and imbalance between the production of reactive oxygen species (ROS) and nitric oxide (NO). Diagnosis of cardiorenal syndrome type 1 involves biomarkers of acute renal injury among which the most important are: neutrophil gelatinaseassociated lipocalin (NGAL), cystatin C, kidney injury molecule 1 (KIM-1), liver-type fatty acid binding protein (L-FABP), IL-18 and the values of nitrogen compounds in serum. In addition to a pharmacological therapy, various modalities of extracorporeal ultrafi ltration are applied in treatment of CRS-1, particularly if there is resistance to the use of diuretic therapy. As opposed to the experimental models, in clinical practice acute renal injury is often diagnosed late so that the measures taken do not give the expected results and the protective role shown in experimental conditions do not give the same results. For all these reasons, it is necessary to analyze the pathophysiology of renal impairment in cardiorenal syndrome as well as detect early indicators of kidney injury that could have clinical benefi t and positive impact on reducing the cost of treatment
MINERALOGY AND PETROLOGY OF THE BRNJICA GRANITOIDS (EASTERN SERBIA)
No full textThe Variscan Brnjica granitoids in East Serbia, occurring in the Kucaj Terrane of the Carpatho-Balkanides, are composed of hornblende - biotite tonalité (TON), biotite granodiorite (GRD), twomica granite (TMG) and leucogranite (LG). The rocks analyzed are slightly peraluminous. A preplate collision tectonic environment is supported based on the R1-R2 discrimination diagram. A two-step mixing plus fractional crystallization (MFC) process is considered responsible for the evolution of the Brnjica granitoids. In the 1st step, the parental magma (having the composition of the more basic TON) is forming the mineral assemblage Pl596Biio.3Hbio.7Mto.7Titi.oQzi7.7 by 44% crystallization, and at the same time is mixed (r=0.1) with a magma similar to TMG to give a melt similar to the composition of the less evolved GRD. In the 2nd step, 60% crystallization (Pl39oKfi oBÌ25oZr06Api aMti 4Titi 0QZ303) of the less evolved GRD and a simultaneous mixing with the same acid magma (TMG) but with higher r (0.6) is needed for the genesis of GRD group. The TON could originate in the crust by melting of amphibolites and basalts under various P-T conditions while the granites could be crustal melts produced by melting of amphibolites, gneisses, graywackes and pelites. Pressure of 2.3 to 4.1 kb and temperatures from 626 to 813 °C were calculated for TON, using hornblende and co-existing hornblende and plagioclase compositions respectively
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