Friction stir welding of aluminium alloys - T joints

The paper presents results of research on the possibility of producing T-joints of aluminium alloys without defect by friction stir welding process. Friction stir welding process is applied in welding T-joints of aluminium alloys 5052-H32 and 5754-H111. These relatively new welding tech-nologies produce high quality welded joints, where strength of the joint can reach the strength of the base material. Visual and macrostructural examination and microhard-ness measuring of the welded T-joints are processed

Friction stir welding of aluminium alloys - T joints

The paper presents results of research on the possibility of producing T-joints of aluminium alloys without defect by friction stir welding process. Friction stir welding process is applied in welding T-joints of aluminium alloys 5052-H32 and 5754-H111. These relatively new welding tech-nologies produce high quality welded joints, where strength of the joint can reach the strength of the base material. Visual and macrostructural examination and microhard-ness measuring of the welded T-joints are processed

Spectrofluorimetric and HPLC Determination of Morin in Human Serum

Morin is a flavonol antioxidant. In ethanol-water mixtures (70 wt% of ethanol) it reacts with Al3+ to give Al(Morin)(2) in the pH range 3-6. The conditional stability constant of this complex at 298 K was found to be log beta(2) = 16.96 +/- 0.02 at pH 4.40. The complex shows strong fluorescence emission at 500 nm upon excitation at 410 nm. The fluorescence intensity is pH dependent with maximum emission at pH 4.40. Since the complexation reaction enhances the fluorescence of morin, this property was used for the determination of morin in human serum. A linear dependence of the intensity of fluorescence of the complex on the concentration of morin was obtained in morin concentration range from 1.5-30.5 ng mL(-1), relative standard error of measurements was 1.4%. The LOD was 0.02 ng mL(-1) while LOQ was 1.0 ng mL(-1). Serum concentration of morin was also determined using HPLC as a reference method. A C-18 Hypersil Gold AQ column was used with acetonitrile-0.1% v/v phosphoric acid (30:70% v/v) as the mobile phase at 1.0 mL min(-1) flow rate and UV detection at 250 nm. Acceptable relative standard errors (less than 5%) between determinations obtained by the two methods indicate that the fluorescence method is reliable

Climate change impact on grape growing in Serbia

Serbian grape growing and fruit production in general is mostly based on relatively small-scale farms with localized terrain and climate features. Climate change analysis and impact studies significantly contribute to the future strategic planning in economic development, and thereby must be done with high level of confidence, which considers cooperative work of the climate research and user community. During the last decade, climate change research in Serbia progressed in accordance with the latest global climate research topics and available computer resources, which are unconditional priority for the quality of the initial data. In this paper are presented latest results of the high-resolution regional climate model simulation, using NMMB model forced with RCP8.5 IPCC scenario (2013). Model bias correction is done for the purpose of their use in impact studies in Serbia. Outcome of the data treatment for model bias reduction is creating a database of the high-resolution daily climate simulation data for the 21st century available for further use in agriculture as well as in other sectors of economy. Usefulness of these data is demonstrated with analysis of the basic climate indices change during the 21st century, which provides assessment of the heat and water availability change, shift in the growing season dates, and risk of the temperature extremes

Climate change impact on grape growing in Serbia

Serbian grape growing and fruit production in general is mostly based on relatively small-scale farms with localized terrain and climate features. Climate change analysis and impact studies significantly contribute to the future strategic planning in economic development, and thereby must be done with high level of confidence, which considers cooperative work of the climate research and user community. During the last decade, climate change research in Serbia progressed in accordance with the latest global climate research topics and available computer resources, which are unconditional priority for the quality of the initial data. In this paper are presented latest results of the high-resolution regional climate model simulation, using NMMB model forced with RCP8.5 IPCC scenario (2013). Model bias correction is done for the purpose of their use in impact studies in Serbia. Outcome of the data treatment for model bias reduction is creating a database of the high-resolution daily climate simulation data for the 21st century available for further use in agriculture as well as in other sectors of economy. Usefulness of these data is demonstrated with analysis of the basic climate indices change during the 21st century, which provides assessment of the heat and water availability change, shift in the growing season dates, and risk of the temperature extremes

Climate change impact on grape growing in Serbia

Serbian grape growing and fruit production in general is mostly based on relatively small-scale farms with localized terrain and climate features. Climate change analysis and impact studies significantly contribute to the future strategic planning in economic development, and thereby must be done with high level of confidence, which considers cooperative work of the climate research and user community. During the last decade, climate change research in Serbia progressed in accordance with the latest global climate research topics and available computer resources, which are unconditional priority for the quality of the initial data. In this paper are presented latest results of the high-resolution regional climate model simulation, using NMMB model forced with RCP8.5 IPCC scenario (2013). Model bias correction is done for the purpose of their use in impact studies in Serbia. Outcome of the data treatment for model bias reduction is creating a database of the high-resolution daily climate simulation data for the 21st century available for further use in agriculture as well as in other sectors of economy. Usefulness of these data is demonstrated with analysis of the basic climate indices change during the 21st century, which provides assessment of the heat and water availability change, shift in the growing season dates, and risk of the temperature extremes

Characteristics of chronic obstructive pulmonary disease patients with depressive disorder

© 2017, Serbia Medical Society. All rights reserved. Introduction/Objective The origin of depressive disorder in chronic obstructive pulmonary disease (COPD) patients is still not completely known and probably is caused by various factors. The aim of this study is to establish the most important characteristics of COPD patients who have depressive disorder. Methods Eighty-nine COPD patients and 65 demographically-matched referents without COPD were included. All the patients underwent lung function examination, and gas exchange, nutritional status, dyspnoea level by the modified Medical Research Council (mMRC) scale and exercise tolerance were also assessed, as well as depressive disorder by Hospital Anxiety and Depression Scale (HADS) and Geriatrics Depression Scale (GDS) and quality of life by St. George’s Respiratory Questionnaire (SGRQ). Results Depressive disorder has been found in 30.3% of COPD patients evaluated by HADS and 25.3% of COPD patients evaluated by GDS. When COPD subjects were stratified by forced expiratory volume in 1 second (FEV1) categorization, all subgroups were more likely to have depressive disorder, according to HADS and GDS, relative to referents with the odds ratio highest (3: 95% confidence interval 1.6–4.9) among those with the FEV1 < 30%. COPD patients with depressive disorder (HADS) compared to non-depressed patients had (differences in mean values) higher intensity of smoking [6.9 (0.5–10.1)], lower body mass index [-4.9 (-7.2–5.4)], lower value of FEV1% [-8.3 (-16.3–1.2)], higher value of total lung capacity (%) [17.8 (2.3–28.4)], higher mMRC score (1.07 (-1–3.0), and higher SGRQ – giving a total score of 32.9 (24.1–40.3). Conclusion Evaluation of depressive disorder should be considered in every patient with COPD, especially in patients with greater degree of airflow limitation and lung hyperinflation, dyspnoea level and malnourished