70 results on '"Jakovljević S"'
Search Results
2. Damage caused by a nanosecond UV laser on a heated copper surface
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Henč-Bartolić, V., Bončina, T., Jakovljević, S., Panjan, P., and Zupanič, F.
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- 2016
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3. The efficacy of photon-initiated photoacoustic streaming and sonic-activated irrigation combined with QMiX solution or sodium hypochlorite against intracanal E. faecalis biofilm
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Balić, M., Lucić, R., Mehadžić, K., Bago, I., Anić, I., Jakovljević, S., and Plečko, V.
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- 2016
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4. Influence of thermal and electrochemical oxidation on the mechanical and corrosion properties of titanium alloy
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ALAR, V., primary, ALAR, Ž., additional, JAKOVLJEVIĆ, S., additional, and RUNJE, B., additional
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- 2021
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5. Sulfasalazine Induced DRESS (drug reaction with eosinophilia and systemic symptoms) syndrome with severe acute hepatitis: Case report
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Kuzman Danilo D., Jeremić-Gajinov Biljana P., Vesković Dunja M., Jakovljević Sanja B., and Vujanović Ljuba M.
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drug induced hypersensitivity syndrome ,severe cutaneous adverse drug reaction ,skin rash ,hypereosinophilia ,regiscar scoring system ,j-scar scoring systeme ,Therapeutics. Pharmacology ,RM1-950 - Abstract
Introduction: Drug Reaction with Eosinophilia and Systemic Symptoms Syndrome is a rare and severe form of drug induced delayed-type hypersensitivity reaction with mortality rate up to 10%. It usually manifests with skin rash, fever, lymphadenopathy, hematological abnormalities and involvement of one or more internal organs. Establishing the diagnosis is sometimes late due to variable clinical presentation. Current recommendations for therapy rely mainly on expert opinions, retrospective studies, case reports and series. Sulfasalazine was firstly synthesized in 1930 and is currently being prescribed for various inflammatory and rheumatic diseases. Case report: We present a 45-year-old patient who was prescribed sulfasalazine tablets by a rheumatologist due to reactive arthritis. In the fourth week of therapy, he developed skin rash and fever up to 39.5°C. On admission, generalized maculopapular exanthema covering over 60% of the body surface area, edema of the lower eyelids and bilateral cervical and inguinal lymphadenomegaly were registered. Laboratory findings showed leukocytosis with significant eosinophilia, lymphocytosis, elevated bilirubin values, ALT
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- 2023
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6. Post-covid HR trends in work organization and their importance for employees in Serbia
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Krušković Tijana, Jakovljević Sanja, and Ilić Biljana
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human resources ,employees ,work organization ,covid-19 ,Economics as a science ,HB71-74 - Abstract
At the beginning of 2020, the world as we knew it changed and it is quite certain that no one could have predicted the extent of those changes and how long they would last. The COVID-19 pandemic has imposed ad-hoc operations on business organizations in a challenging environment in all fields. The tasks of human resource management were to adapt and respond to radical changes that occurred both in the workplace and on the social level. On the other hand, the employees were worried about the uncertainty that was omnipresent. The aim of the conducted research and the results presented in the paper refer to the importance of flexibility in the choice and manner of working hours, as well as the willingness of employees to change jobs after the pandemic. An overview of the situation on the market in Serbia is given, all with the aim of adapting and benefiting employees in the current working environment.
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- 2023
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7. Esophageal Leiomyoma in a Lowland Gorilla
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Barr, F., Waterman, A. E., Lucke, V. M., and Jakovljevic, S.
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- 1988
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8. Cytototoxic effects of novel synthesized polyoxometalates on human neuroblastoma SH-SY5Y cell line
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Isma, J., primary, Jakovljević, S., additional, and Isaković, A., additional
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- 2017
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9. Interleukin 33, soluble suppression of tumorigenicity 2, interleukin 27, and galectin 3 as predictors for outcome in patients admitted to intensive care units
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Eric Stevan, Zaric Radica Zivkovic, Jevdjic Jasna, Drakulic Svetlana Miletic, Stanojevic Ivan, Vojvodic Danilo, Arsenijevic Petar, Stojanovic Bojan, Jakovljevic Stefan, Markovic Nenad, Zaric Milan, Canovic Petar, Nesic Jelena, and Zornic Nenad
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interleukin 33 ,galectin 3 ,interleukin 27 ,intensive care units ,outcome ,Medicine - Abstract
Intensive care units (ICUs) are expert hospital areas that provide treatment and 24 h care for people who are very sick. Sepsis represents a serious, severe condition and it can lead to septic shock and multiple organ dysfunction syndromes and is one of the most common reasons for patients’ hospitalization in ICUs. We wanted to explore the prognostic values of interleukin (IL) 33, soluble suppression of tumorigenicity 2 (sST2), IL 27, and galectin 3 in critically-ill patients. We assumed that these parameters in combination or alone could predict mortality in ICU patients. This research represents a clinical non-randomized prospective study, performed at the Medical Military Academy, a tertiary care hospital in Belgrade, Serbia. The patients were divided in four groups: patients with sepsis (peritonitis, pancreatitis, trauma) and patients without sepsis (trauma). Total number of patients enrolled in the study was 151 and average years of patients were 56.48. The values greater than the cut-off were the predictors of mortality. The IL-33, IL-27 as well as galectin-3 can successfully predict the outcome of critically-ill patients in ICUs. The sST2, cannot predict death in critically-ill patients as a single prognostic factor. However, the combination of at least two biomarkers: IL-33, sST2, IL-27, and galectin-3, gives very significant results in predicting the outcome in patients admitted to ICUs.
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- 2023
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10. Carbon dioxide corrosion of carbon steel and corrosion inhibition by natural olive leaf extract
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Pustaj, G., primary, Kapor, F., additional, and Jakovljević, S., additional
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- 2017
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11. Facial nerve palsy as the first sign of late breast cancer metastasis to the temporal bone
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Dudvarski Zoran, Arsović Nenad, Dimitrijević Milovan, Jakovljević Saša, Boričić Novica, and Boričić Ivan
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breast neoplasms ,facial nerve diseases ,immunohistochemistry ,neoplasm metastasis ,temporal bone ,tomography, x-ray computed ,treatment outcome ,Medicine (General) ,R5-920 - Abstract
Introduction. Late metastases of malignant tumors in the temporal bone are very rare lesions. They can be asymptomatic for a long time and usually manifest them-selves in the form of hearing loss, dizziness, tinnitus, and paralysis of the facial nerve. Modern radiological diagnostics and explorative surgery with biopsy are essential for diagnosis. Case report. We present a rare and unusual case of a 66-year-old female patient with facial nerve paralysis that appeared as the first sign of metastatic breast cancer in the temporal bone 10 years after treatment. A sudden hearing loss and dizziness occurred six months later, and the value of CA 15-3 was elevated. Scintigraphy pointed to susceptible metastatic deposits of the axial skeleton without lesions in the temporal bone. Finally, repeated computed tomography revealed osteolytic changes in the temporal bone six months after that. Immunohistochemical analysis of mastoid tissue samples confirmed that it was a breast cancer metastasis. One year after palliative radiotherapy and oral hormone therapy, a patient had a good general condition with a better function of the facial nerve. Conclusion. A high degree of clinical suspicion sometimes requires repeated radio-logical diagnostics in order to detect osteolytic metastatic changes in the temporal bone but also in other bone structures within the hematogenous dissemination of the malignant disease.
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- 2022
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12. Contracting account audit on social networks
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Jakovljević Nemanja and Jakovljević Stefan
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social network ,audit ,contract ,auditor ,account ,Business ,HF5001-6182 - Abstract
Social network account audit is an independent review of social network activities to express a professional opinion on the fulfillment of objectives, business compliance, and information security of orders on social networks. It is in principle a voluntary activity and is not subject to legal obligation like some other types of audit such as the audit of financial statements. However, this does not diminish its fundamental importance, which is reflected in the fact that in situations where the other party is entrusted with the management of accounts on social networks, there is a gap in expectations that should be mitigated by performing a professional and independent review that will result in an objective and professional opinion. Therefore, the issue of contracting the social network account audit is exciting, especially given the sensitivity of the data being audited and the specific status of the parameters for logging into the account whose disposal must be subjected to strict treatment to ensure the safety of account holders. The subject of this paper is the analysis of aspects of contracting the audit of orders on social networks through the analysis of contracting parties and elements of the subject of contracting. The paper's main conclusion is that auditing is a sensitive topic that should be given additional attention and focus during preliminary social network account audit activities.
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- 2022
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13. Body Mass Index in determination of the relationship between body constitution and motor abilities
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Pajić Zoran, Jakovljević Saša, Anđelković Marija, and Simović Slobodan
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body composition ,motor performances ,muscle to fat ratio ,fat mass index ,fat free mass index ,Recreation. Leisure ,GV1-1860 - Abstract
The aim of this paper is to review and summarize the theoretical and empirical facts of using the (BMI), (body mass index) in determining the relationship between body constitution and motor skills. Several key circumstances have been identified in which the body mass index can give erroneous information about the actual body composition, and especially about the amount of adipose tissue in the body. Factors such as age, sex, race, health status and muscle mass can influence the connection between(BMI) and body fat. Due to a relatively low coefficient of determination between (BMI)and percentage of body fat, one should be cautious when using (BMI) to evaluate body composition as a predictor of obesity or as a substitution measure in evaluating the influence of body constitution on the efficiency of motor performances. The analysis of the sources indicates that the existence of unexplained facts uses alternative measures of body composition and their limited use in research and direct training practice. Therefore, new concepts and models are necessary in order to explain the influence of body composition on the efficiency of motor performance. Apart from the necessary evaluation of variables of percentages of fatty and muscle tissues, it could be assumed that the application of two component (BMI) = (FFMI+FMI), (Fat Free Mass Index, Fat Mass Index) and/or (MFR) model (Muscle to Fat Ratio) would provide a better comprehension of these relations.
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- 2022
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14. Characterization of Ag and Au nanolayers on Cu alloys by TLC, SEM-EDS, and ICP-OES
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Rezić, I., primary, Špehar, M., additional, and Jakovljević, S., additional
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- 2016
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15. The effect of surface treatment AISI 316L welded joints on its corrosion behaviour in chloride solution
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VRSALOVIC, L., primary, PAIĆ, T., additional, ALAR, V., additional, STOJANOVIĆ, I., additional, JAKOVLJEVIĆ, S., additional, GUDIĆ, S., additional, and SMOLJKO, I., additional
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- 2016
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16. A study on erosion of ductile cast iron
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Jakovljević, S. and Kresimir Grilec
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erosion resistance ,ductile cast iron ,abrasive erosion ,impact erosion - Abstract
This study ha investigated the wear behavior of three different kinds of erosion particles on ductile cast iron (NCI). Particle erosion is a wear loss from the surface of solid body caused by the relative motion of fluid with solid particles. When the impact angle is low (between 0° and 30°), this kind of erosion is called the abrasive erosion. On the other side, if the impact angle is between 60° and 90°, the erosion is regarded as impact erosion. One of the advantages of ductile cast iron in relation to other cast irons is its good wear resistance. Particle erosion resistance is a function of impact angle and the kind of erosion particles. In the experiments samples of ductile cast iron were eroded with steel erodent particles of two different sizes at six different angles of impact (15°, 30°, 45°, 60°, 75° and 90°). The test results were presented as the loss of mass, which occurred during the test. Testing with quartz sand and steel erodent particles shows that ductile cast iron has several times better abrasive erosion resistance than impact erosion resistance. The maximum measured wear was at 75° in the testing with quartz sand and at 60° in the testing with steel erodent particles.
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- 2009
17. Characterization of Ag and Au nanolayers on Cu alloys by TLC, SEM-EDS, and ICP-OES.
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Rezić, I., Špehar, M., and Jakovljević, S.
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COPPER alloys ,SILVER-plating ,SILVER alloys ,SCANNING electron microscopes ,EMISSION spectroscopy - Abstract
This paper reports a study on four historical samples from 19th century originating from Croatia, Europe, made of silver plated and gilded copper alloys. The investigation was carried out by chromatographic, spectroscopic, and microscopic techniques. Corrosion was identified in all samples by scanning electron microscope-energy dispersive spectroscopy (SEM-EDS), although the samples were in well-preserved states. EDS has given the following average composition of elements Ag (82.99, 4.74, 6.34, and 15.54 wt% in samples 1-4, respectively), Au (17.01 wt% in sample 1), and Cu (0, 95.26, 93.66, and 84.46 wt% in samples 1-4, respectively) for the outer layers of the samples. The exact sample elemental composition was determined by inductively coupled plasma optical emission spectroscopy (ICP-OES): 0.12, 0.22, 0.68, and 1.20 wt% Ag in samples 1-4, respectively and 0.02 wt% Au in sample 2, all on Cu alloys with impurities of Fe, Mn, Ni, Pb, Sb, Si, Sn, and Zn (in quantities 0.05-1.48 wt%). Preliminary detection of metals was performed by thin-layer chromatography. Results of determined chemical composition were consistent with similar investigations, since silver-plated and gilded Cu alloys were the materials used in the production of similar samples through the history. [ABSTRACT FROM AUTHOR]
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- 2017
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18. Contact sensitization in patients with chronic venous insufficiency and the impact of the disease duration on the risk of occurrence of contact sensitization
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Vujanović Ljuba, Jovanović Marina, Matić Milan, Jakovljević Sanja, and Golušin Zoran
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dermatitis, contact ,incidence ,risk assessment ,venous insufficiency ,Medicine (General) ,R5-920 - Abstract
Background/Aim. Development of allergic contact der-matitis as a complication of treatment of chronic venous insufficiency (CVI) is well known. The aim of this study was to determine the incidence and risk of eczematous contact sensitization in patients with CVI, as well as the correlation between disease duration and contact sensitization. Methods. The study involved 266 subjects examined during three-year-period who were divided into two groups: the study group included patients with CVI referred for allergy testing due to suspected contact dermatitis, and the control group included the ones without CVI patch tested for suspected contact dermatitis. The severity of CVI was assessed by Clinical Etiology-Anatomy-Pathophysiology (CEAP) classification. Thereafter, each patient underwent patch testing. Results. The incidence of contact sensitization among patients with CVI was 49.3%. In these patients, the incidence of contact sensitization to the European standard battery of allergens was 31.55%; to the battery specific for CVI it was 28.45%. Patients with CVI had a 2.45-fold higher risk for developing contact sensitization to two or more allergens, and a 3.69-fold higher risk for developing contact sensitization to five or more allergens compared to those without CVI. The prevalence of contact sensitization in patients with CVI was not significantly different from those without CVI. There was a positive correlation between the incidence of contact sensitization and the duration of the disease. Conclusion. Patients with CVI had no statistically significantly distinct contact sensitization prevalence and had 2.45 and 3.69 times higher risk to manifest contact sensitization to two and more allergens and five and more allergens, respectively, than patients with no CVI. The positive correlation between frequency of contact sensitization and disease duration was found.
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- 2021
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19. Serbia: The country of basketball
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Jakovljević Saša and Mandić Radivoj
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basketball ,serbia ,yugoslavia ,developement ,Recreation. Leisure ,GV1-1860 - Abstract
The aim of this paper is to analyse descriptive and causal factors of basketball development in Serbia, particularly following the country's independence (2006) to this day. The paper presents the development path of "the game under two elevated hoops", since its arrival to Belgrade in the 1920s, through the challenges and successes in various state communities, since the State of Slovenes, Croats and Serbs (1918-1929), the Kingdom of Yugoslavia (1929-1945), the Socialist Federal Republic of Yugoslavia (1945-1992), the Federal Republic of Yugoslavia (1992-2003), the State of Union of Serbia and Montenegro (2003-2006), to the Republic of Serbia. The paper shows the participation in the Yugoslav basketball, as well as the events that marked the period of full independence of the Republic of Serbia. The results of the national teams are shown, including the contribution of the national basketball organization .The analysis has included the condition of senior and age categories, coach and referee organizations. Serbian basketball has shown originality in creating Yugoslav basketball, with continuing to be successful also in the independent country, which gives credibility and justifies the marketing and promotional campaigns of the national basketball federation that Serbia is the country of basketball.
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- 2021
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20. Antioxidant and cytotoxic activities of curly dock (Rumex crispus L., Polygonaceae) fruit extract
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Ćebović Tatjana, Jakovljević Dunja, Maksimović Zoran, Đorđević Snežana, Jakovljević Sanja, and Četojević-Simin Dragana
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antioxidants ,lipid peroxidation ,phytotherapy ,plants, medicinal ,polygonaceae ,Medicine (General) ,R5-920 - Abstract
Background/Aim. Congenital malformations still represent one of the most important causes of prenatal and infant death. The study aim was to analyze occurrence, outcomes and risk factors of different types of congenital anomalies. Methods. The study included all pregnant women directed to Clinic of Obstetrics and Gynecology, Clinical Center of Serbia, Belgrade due to prenatally diagnosed congenital fetal anomalies during past ten years (January 1, 2008–December 31, 2017). Upon admission to our Clinic a detailed general medical and obstetrical history were taken from every patient. All women underwent genetic testing. Ultrasonography and magnetic resonance were diagnostic methods for fetal malformations confirmation. Results. The study included 773 pregnant women aged from 18 to 46 years. Out of registered nine different groups of fetal anomalies/malformations, the most common were malformations of the central nervous system, while majority of fetuses had combined multiple anomalies. Genetic cause for congenital anomalies was present in 25.2% of pregnancies. Medical pregnancy abortion was performed in 71.8% of cases. Only 10.2% of pregnancies ended in term. The best outcome for children was obtained in case of gastrointestinal anomalies (52% live born). Contrary, only one child with neck and thorax malformations could be saved. According to logistic regression the most important predictor of having a child with combined multiple anomalies was mother’s age, while predictor of central nervous system anomalies was gestational diabetes. The significant predictor of genetic anomalies was mother’s age. Conclusion. In our sample neurological congenital anomalies were the most common, although abnormalities of all organ systems were registered. Majority of pregnancies had to be discontinued due to combined multiple anomalies caused by genetic disorders. Older mother’s age and diabetes can imply on the increased risk for fetal malformations.
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- 2020
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21. The influence of the complex training method on maximal isometric force production of junior basketball players
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Kukrić Aleksandar S., Jakovljević Saša, Dobraš Radenko, Petrović Borko, Vučković Igor, and Janković Nenad
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explosive power ,postactivating potentiation ,reactive training ,junior basketball players ,Recreation. Leisure ,GV1-1860 - Abstract
During the period of ten weeks, a study has been conducted on the effects of a complex training method on the maximal isometric muscle force, its peaking time, and the rate of force development in the semi-squat test. The participants of the study were twenty junior basketball players (average age 16.4+/-0.7; mean body height 186.2cm+/-9.2; mean body weight 75,4+/-7.5kg; mean body fat percentage 12,83%+/-1.15). The participants were divided into experimental (n=10) and control group (n=10). The experimental group, besides technical-tactical training sessions, had additional complex training, while the control group had technical-tactical training sessions only. At the final testing, the results of maximal isometric muscle force and the explosive power index, have significantly improved in the experimental group, while the control group did not make significant progress. There were no significant changes in the maximal isometric muscle force's peak time at the final testing. The study findings indicate that application of the complex training method has positive effects on the development of maximal isometric force, and the rate of force development.
- Published
- 2019
22. THE IMPORTANCE OF THE APPLICATION OF FAIR VALUE OF THE COMPANY'S PROPERTY IN TRANSITIONAL COUNTRIES ON THE WAY TO THE EU
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ČOLOVIĆ MRĐAN, JAKOVLJEVIĆ SANJA, and BOGDAN LABAN
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financial statements ,financial analysis ,fair value. ,Commercial geography. Economic geography ,HF1021-1027 ,Economics as a science ,HB71-74 - Abstract
The fair value within the business improvement in the enterprises of the Republic of Serbia is continuing demanding work that is carried out in the framework of financial reporting management companies, sectors of economy, but the national authorities may require a completely evaluation of companies, based on the decisions of state bodies and individual requirements. An important place in this context have the internal audit, external audit, as these can be a driver of the fair value of the initial phase by the management council. External audit is able to thinking management delivered only after the end of the business year, when it receives the financial statements of the previous year of business, and then can make recommendations, because through their impact on future business management, provided that it is adopted, it will be is maintained in the next period of operation. Therefore regardless of the drivers and the initiator of the fair value now exist ways to increase the security of the overall business, and in this paper highlighted the fair value as an element of financial reporting. It is expected to increase the number of effective fair value in the Republic of Serbia, because companies can realize numerous benefits.
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- 2018
23. Contact sensitization to allergens of biological origin from the compositae family and original extracts of ubiquitous weed plants of vojvodina among patients with chronic venous insufficiency
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Vujanović Ljuba, Jakovljević Sanja, Golušin Zoran, and Levakov Olivera
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allergic contact dermatitis ,chronic venous insufficiency ,compositae dermatitis ,ubiquitous weed plants of vojvodina ,Dermatology ,RL1-803 - Abstract
Background: The use of alternative treatment methods, particularly medicinal herbs from the family Compositae, significantly contributes to the increase in the incidence of allergic contact dermatitis among patients with chronic venous insufficiency. Objective: Estimating frequency of contact sensitization among patients with chronic venous insufficiency and determining the most common contact sensitizers from the series of bio-origin allergens from the Compositae family and ubiquitous weeds of Vojvodina. Materials and Methods: The total number of 266 patients with suspected contact dermatitis was divided into two groups: the experimental group consisted of patients with chronic venous insufficiency (EG), and the control group consisted of patients without chronic venous insufficiency (CG). All subjects were tested with allergens of biological origin from the family Compositae, screening allergen SL-mix and original extracts of ubiquitous weed plants of Vojvodina. Results: Patch test revealed a positive reaction to allergens of the Compositae family in 6.69% in the experimental group, and in 4.17% in the control group. The standardized response rate to the SL-mix in the experimental group was 2.07%, while in the control group, it was 1.51%. The presence of a positive reaction to at least one extract of ubiquitous weed plants of Vojvodina was determined in 6.11% in the experimental group, and in 3.23% of patients in the control group. No statistically significant difference in response rates was found between the examined groups. Conclusions: Establishing the diagnosis of Compositae dermatitis can be supplemented by additional testing with weed plant extracts from a specific geographical area, resulting in the detection of novel unknown allergens.
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- 2022
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24. Speed-strength abilities and morphological characteristics of basketball players aged 10 and 11
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Đorđević Alen, Jakovljević Saša, Pajić Zoran, and Nikolić Aleksandra
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body composition ,acceleration ,agility ,explosiveness ,Recreation. Leisure ,GV1-1860 - Abstract
The aim of this study was to identify several morphological characteristics and speed-strength abilities in basketball players aged 10 and 11, and to determine possible differences between them, connected with their age. The research was conducted on a sample of 84 young basketball players aged 10 (N=46) and 11 (N=38). The following motor variables were measured: shoulder explosiveness (throwing the ball from basketball position), leg explosiveness (vertical jump), speed strength of the trunk (sit up exercises in 10 seconds), stamina in speed strength of the trunk (sit up exercises in 30 seconds), the speed of changing the direction of moving (agility T-test), acceleration (running for 5 and 20 meters). The following morphological variables were also measured: body height, body mass, percentage of body fat and percentage of muscle tissue. Eleven-year-olds achieved better results than the ten-year-olds in all categories. Statistically significant differences (p
- Published
- 2016
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25. Determination of the optimal certain kinematic parameters in basketball three-point shooting using the 94Fifty technology
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Dobovičnik Luka, Jakovljević Saša, Zovko Vinko, and Erčulj Frane
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basketball ,entry angle ,rotation of the ball ,release time ,Recreation. Leisure ,GV1-1860 - Abstract
With the help of the 94Fifty technology we were able to analyze the three-point shot. We were curious to know whether the majority of the shots are recommended by the manufacturer of the measuring system and carried out in preplanned intervals of entry angles, the rotation of the ball, and the release time of the ball, and we wished to find out the consistency of the aforementioned parameters between the guards and other players. The hypotheses were tested on a sample of 52 great male basketball players, aged 18 and 19. We deducted that most of the shots from the distance of 6.75 m occur under a entry angle greater than 42°, but not in the estimated interval (between 42° and 48°); that most of the shots do not occur in the estimated interval of the rotation of the ball (from 130 to 150 revolutions/minute); and that most of the shots do not occur in the estimated interval of the release time (< 0.7 seconds). When it comes to the consistency of the before mentioned parameters we did not find any discrepancies between the guards and other players. Based on the results a question arises: did the manufacturer of the measuring system adequately form the intervals of the aforementioned parameters or does the problem lie in the performance of the shots by the chosen players?.
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- 2015
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26. Acceleration and speed of change of direction and the way of movement of quality basketball players
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Jakovljević Saša, Karalejić Milivoje, Pajić Zoran, and Mandić Radivoj
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seniors ,20m ,T test ,correlations ,differences ,Recreation. Leisure ,GV1-1860 - Abstract
The aim of this survey was to examine the ability of acceleration and the agility of basketball players. The survey was conducted on a sample of 35 professional Bulgarian basketball players (average age 21.37 ± 2.91 years) who competed in the First Bulgarian Basketball League and were divided into two groups depending on the position of the game: inner players - N = 13 and outer players - N = 22. They were chosen by experts as the best national players in the league. Two tests were applied: 20 meter run (acceleration - T20m) and T-test (agility - TT). During the 20 - meter run test, the running times of five (T5m) and 10 meters (T10m) were measured. In addition, body height (BH) and body mass (BM) were measured. Inner players were significantly taller and heavier than the outer players, but no statistically significant differences were found between the two groups of players in the acceleration and agility variables, having in mind that on all the tests outer players achieved better results. High correlations were found between three acceleration variables (T5m, T10m and T20m) and one agility variable (TT) - correlation coefficients of .666 to .819 at the significance level of .01.The correlations between body height and acceleration variables are medium - correlation coefficients of .306 to .383, at the significance level of .05, while the correlation coefficients between body mass and these variables are slightly higher .350 to .415 at the significance level of .01, or .05.
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- 2011
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27. Erosion of ductile cast iron with quartz particles
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Kresimir Grilec, Jakovljević, S., and Prusac, D.
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austempered ductile cast iron ,ductile cast iron ,particle erosion - Abstract
Ductile cast iron has high fatigue strength due to the spherical shape of graphite, especially after quenching and tempering. Higher toughness can be achieved by austempering. One of the advantages of ductile cast iron in relation to other cast irons is its good wear resistance. In the experiments, samples of ductile cast iron and austempered ductile cast iron were eroded with quartz sand particles at six different angles of impact (15°, 30°, 45°, 60°, 75° and 90°). The test results were presented as the loss of mass which occured during the test. Testing with quartz sand shows that the particle erosion resistance of ductile cast iron was better than that of austempered ductile iron for all impact angles except for 60°. The maximum measured wears of ductile cast iron and austempered ductile iron were at 75°.
28. Adsorption isotherms of cobalt ions removal from solutions using fly ash class F
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Mužek, Mario Nikola, Tolić, Marija, Svilović, Sandra, Zelić, Jelica, Alar, Ž., Jakovljević, S., Šolić, S., and Ž. Alar, S. Jakovljević, S. Šolić
- Subjects
fly ash class F ,cobalt ,isotherms - Abstract
A class F fly ash from the Croatian power plant Plomin 2 has been used for the sorptive removal of cobalt ions from aqueous solutions by a batch technique. The experiments were carried out as a function of solute concentration at constant temperature (298 K) and particle size (< 45 μm). Langmuir, Freundlich, Dubinin-Radushkevich, Redlich-Peterson, Sips and Toth isotherms were fitted to experimental data, and their goodness-of-fit were compared. According to the results obtained, the sorptive removal of cobalt ions is process of homogeneous adsorption as the Redlich-Peterson and Langmuir isotherms were found to give a better fit to experimental data than other isotherms that take into account some sort of heterogeneity. The results indicated that fly ash class F can be used for the removal of cobalt ions from wastewaters.
- Published
- 2013
29. INHIBITION OF ACIDIC ALUMINIUM CORROSION USING ETHANOL SOLUTION OF LAVENDER ESSENTIAL OIL
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Halambek, Jasna, Berković, Katarina, Gojo, Miroslav, Alar, Ž., and Jakovljević, S.
- Subjects
inorganic chemicals ,corrosion ,inhibition ,lavender oil ,polarization ,EIS ,complex mixtures - Abstract
Corrosion inhibition of aluminium in 1 M HCl solution using 30% (v/v) ethanol solution of Lavandula angustifolia L. oil was studied by potentiodynamic polarization and EIS methods. It was found that lavender oil effectively inhibits aluminium corrosion in concentration range from 50 to 500 ppm by volume. Polarization curves showed that lavender oil behaves as cathodic inhibitor for aluminium in HCl solution. EIS results confirmed that active compounds present in this oil have ability to form protective layer on aluminium surface. Inhibitive effect was probably caused by adsorption of active compounds such as linalool, linalyl acetate, 1, 8-cineole and camphor on aluminium surface. This study showed that ethanol solution of Lavandula angustifolia L. oil could be used as an effective green corrosion inhibitor for aluminium corrosion in acidic medium, but must be handled as mixture of inhibitors which can act synergistically to inhibit aluminium corrosion.
- Published
- 2013
30. Utjecaj dubokog hlađenja na trošenje reznih pločica od tvrdog metala
- Author
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Šolić, Sanja, Schauperl, Zdravko, Karalić, Branko, Alar, Ž, Jakovljević, S, and Šolić, S.
- Subjects
duboko hlađenje ,rezni alati ,tvrdi metal ,trošenje stražnje površine - Abstract
Postupak dubokog hlađenja već dulje vrijeme je u industriji reznih alata priznat kao postupak kojim se povećava otpornost na trošenje alata. U ovom su radu prikazani rezultati istraživanja utjecaja dubokog hlađenja na trošenje stražnje površine reznih pločica ISO P-35. U radu je metodom ispitivanja obradivosti jednom oštricom na tokarskom stroju obrađivan čelik AISI D3. Trošenje reznih pločica određivano je mjerenjem trošenja stražnje površine te vremena potpunog istrošenja rezne pločice. Istraživanje je pokazalo da je duboko hlađenje utjecalo na smanjenje trošenja stražnje površine reznih pločica ISO P-35, ali i da je obrađivani čelik AISI D3 prezahtjevan za provedbu ispitivanja obradivosti te svojim svojstvima ne omogućuje detaljno praćenje utjecaja dubokog hlađenja na trošenje reznih pločica od tvrdog metala.
- Published
- 2013
31. Numerical model for multi‐ion diffusion in cementitious materials – MultIDiff CODE
- Author
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Ukrainczyk, Neven, Koenders, Eduardus, van Breugel, Klaas, Alar, Ž., Jakovljević, S., and Šolić, S.
- Subjects
numerical model ,cementitious materials ,durability ,ionic diffusion - Abstract
Transport processes in cementitious materials play a crucial role in both the degradation process of building materials as well as in the containment of hazardous wastes. It is known that modeling of the ionic diffusion through cementitious materials by a plain (unmodified) Fick’s law is inappropriate and requires a different approach. In this paper a numerical platform called MultIDiff (Multi‐ionic Diffusion) is presented for solving a complex system of nonlinear Nernst‐Planck equations for the diffusion of ions through cementitious materials that considers electrical coupling between several diffusive ions. Novelty of the MultIDiff approach is in its advanced numerical implementation employing Matlab’s built‐in solvers. The MultIDiff is dedicated to predict concentration profiles and fluxes for each ion and the resulting potential distribution through the cementitious material, and provides a good convergence rate. Furthermore, it is robust enough to handle non‐linearity and the couplings of the equations, and resents a more reliable way to obtain long term durability predictions of cementitious materials.
- Published
- 2013
32. Property Changes of Fishing Nets made of Polyamide 6 after Simulated Ageing
- Author
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Tomljenović, Antoneta, Bašak, Andreja, Rusak, Kristina, Kovačević, Zorana, Paul, Roshan, Brouta-Agnésa, Marolda, Alar, Ž., Jakovljević, S., and Šolić, S.
- Subjects
fishing nets ,polyamide 6 ,ageing simulation ,tensile properties ,SEM - Abstract
The durability testing of fishing nets is not defined by the normative regulations, nor the impacts of the usage conditions on their functionality are fully clarified. The durability evaluation of netting yarns and knotted netting made of polyamide 6 (PA6) was carried out, by investigating the influence of solar radiation and sea salt (NaCl) separately in the laboratory simulated ageing conditions ; and the combined effects of sea water, solar radiation and all atmospheric influences through simulation of real application conditions. The samples were exposed to artificial light source in a Xenotest, neutral salt spray (NSS) in a salt spray cabinet for 60 hours and in natural environment at a Croatian island Lošinj during two months, where the samples had been repeatedly immersed in seawater during the night and during the day exposed to direct solar radiation. The surface characterization of the PA6 netting samples was carried out using SEM analysis. With the aim of determination of tensile properties changes, breaking force, knot breaking force and elongation of netting yarns and mesh breaking force were examined in the dry and wet state. Results indicated that exposure of PA6 netting materials to simulated ageing in a relatively short period affecting the change of investigated properties.
- Published
- 2013
33. Fracture analysis of lifting hooks made of carbon steels
- Author
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Slokar, Ljerka, Matković, Tanja, Matković, Prosper, Alar, Ž., Jakovljević, S., and Šolić, S.
- Subjects
fracture ,lifting hook ,carbon steel ,mechanical properties ,microstructure - Abstract
Modern construction would not have been possible without steel as primary material. It has to satisfy the requirements for acceptable application under different conditions. The goal of this investigation was to examine the cause of fracture of lifting hooks made of two different plain steels(C45 and B 500B) via mechanical and microstructural properties. For that purpose mechanical tensile and hardness tests, Charpy impact test were carried out as well as light and scanning electron microscopy. Chemical omposition was determined by optical emission spectrometer. The obtained results show that investigated steels have the lack of purity with respect to the inclusions, microporosity and high copper content. So the lifting hooks made of plain steels could be easily fractured. Also, galvanizing as corrosion protection is not recommended because it might lead to the harmful effect on the mechanical properties of the material.
- Published
- 2013
34. Influence of citric acid on properties of calcium aluminate cement based materials
- Author
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Vrbos, Nevenka, Ukrainczyk, Neven, Šipušić, Juraj, Alar, Ž, Jakovljević, S, and Šolić, S
- Subjects
calcium aluminate cement ,citric acid ,hydration ,mechanical properties ,setting time - Abstract
The duration of suitable workability of cement-based materials during placement is defined by the setting time and has great practical and financial interest. Calcium aluminate cement (CAC) is a versatile special cement used for specific applications in corrosive environment or high-temperature resistant applications. In this paper, the influence of the citric acid monohydrate (C6H8O7*H2O) on the setting time, flexural and compressive strength of the hydrated commercial calcium aluminate cement has been studied. The setting time of the prepared materials was determined by standard Vicat needle test. Hydration products were characterized by X-ray powder diffraction. Citric acid acts as a retarder of calcium
- Published
- 2013
35. The MgO (80% precipitation) from seawater
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Miroslav Labor, Maja Tolo, Vanja Martinac, Jelena Jakić and Ž. Alar, S. Jakovljević, S. Šolić
- Subjects
substoichiometric precipitation ,precipitate rinsing method ,magnesium oxide from seawater - Abstract
This study has examined the effect of the combined method of rinsing of magnesium hydroxide precipitate, by (3+2) decanting and repeated rinsing (up to 5 times) on filter paper, on mass fractions of B2O3, CaO and MgO in calcined magnesium oxide obtained from seawater by substoichiometric precipitation. The addition of dolomite lime, as the precipitation agent, was 80% of the stoichiometrically required quantity. In the first stages of the rinsing process during decanting, distilled water of pH value of 6.64 was used, followed by alkalised distilled water of pH value of 12.50. The results indicate that repeated rinsing of the precipitate on filter paper with fresh distilled water is more effective in reduction of the CaO fraction in the final product, i.e. calcined magnesium oxide. The results also indicate that it suffices to repeat the rinsing of the magnesium hydroxide precipitate on filter paper with fresh distilled water three times.
- Published
- 2013
36. Priprema lanenih vlakana za ojačala u kompozitnim materijalima
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Vojnović, Ida, Šurina, Ružica, Gudlin Schwarz, Ivana, Knezić, Željko, Marić, Gojko, Tomljenović, Antoneta, Alar, Ž., Jakovljević, S., and Šolić, S.
- Subjects
tehnička lanena vlakna ,lanena roving pređa ,tkana ojačala ,karakterizacija svojstava ,kompozitni materijali - Abstract
Pored uobičajene primjene lana u odjevne svrhe, u novije vrijeme tehnička lanena vlakna su veoma cijenjena sirovina u području proizvodnje tehničkog tekstila, a posebice bio-kompozitnih materijala. Tehničko laneno vlakno je oporabljivo, biorazgradivo i iznimno otporno na vlačna opterećenja. U radu je prikazana izrada i karakterizacija svojstava dva tkana ojačala od lanenih vlakana namijenjena izradi kompozitnih materijala s poliesterskom matricom. Za izradu tkanih ojačala primijenjena su tehnička vlakna iz kultivara Viola zasijanog 2011. godine na lokaciji Križevci, definirane duljine, finoće, prekidne sile i istezljivosti te pripadajuće čvrstoće. S obzirom na ograničenu duljinu vlakana, a sa svrhom priprave visoko orijentirane neuvijene pređe iz paraleliziranih vlakana - roving pređe, provedeno je škrobljenje snopića vlakana jednake mase s prednamakanjem. Utvrđena je finoća, prekidna sila i istezljivost te čvrstoća dobivene lanene roving pređe, a po uzoru na standardna ojačala iz staklenih vlakna, na tkalačkom stanu su ručno otkana dva ojačala u platnenom vezu (2D i UD 0°), definirane debljine, plošne mase i broja niti na jediničnoj duljini.
- Published
- 2013
37. UTJECAJ POLI(ETILEN-GLIKOLA) NA TOPLINSKU RAZGRADNJU MJEŠAVINA POLI(VINIL-KLORID)/POLI(ETILEN-OKSID)
- Author
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Miće Jakić, Nataša Stipanelov-Vrandečić, Ivka Klarić and Ž. Alar / S. Jakovljević / S. Šolić
- Subjects
diferencijalna pretražna kalorimetrija ,infracrvena spektroskopija sa Fourierovom transformacijom ,neizotermna termogravimetrija ,poli(etilen-glikol) ,poli(vinil-klorid) - Abstract
Poli(vinil-klorid) (PVC) je širokoprimjenljivi plastomer koji svoju raznoliku primjenu može zahvaliti dobroj kompatibilnosti s nizom dodataka čime se dobije materijal željenih svojstava. Zbog današnjih zahtjeva za očuvanjem okoliša od interesa je istraživati nove mogućnosti modifikacije PVC-a ekološki prihvatljivim materijalima kao što su poli(etilen-glikol) (PEG) i poli(etilen-oksid) (PEO). PEG i PEO su djelomično kristalni, biokompatibilni, biorazgradljivi i vodotopljivi polieteri. PEG je oligomer (molekulske mase do 20 000) a PEO je polimer etilen-oksida komercijalno dostupan u širokom rasponu molekulskih masa (20 000 - 8 000 000). Ovi se polimeri razlikuju u fizikalnim svojstvima zbog različite duljine lanaca dok su im kemijska svojstva vrlo slična. Nađeno je da dodatak PEG-a može ubrzati proces uklanjanja HCl-a u kemijskim postupcima recikliranja polimernog otpada koji sadrži PVC. Stoga je u ovom radu istraživan utjecaj niskomolekulnog dodatka PEG-a na toplinsku stabilnost PVC/PEO mješavina diferencijalnom pretražnom kalorimetrijom (DSC) i neizotermnom termogravimetrijom (TG) u inertnoj atmosferi. Interakcije polimera i njihovih razgradnih produkata procijenjene su usporedbom eksperimentalnih TG krivulja s onima izračunatim na osnovu pravila aditivnosti. Iz TG krivulja snimljenih pri različitim brzinama zagrijavanja izračunate su aktivacijske energije toplinske razgradnje primjenom Flynn-Wall-Ozawa metode. Infracrvenom spektroskopijom sa Fourierovom transformacijom (FT-IR) promatrani su pomaci karakterističnih vrpci s ciljem utvrđivanja interakcija polimera u mješavini.
- Published
- 2013
38. Equilibrium studies of copper cations exchange by sinthetic zeolite X
- Author
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Svilović, Sandra, Jakovčević, Mirka, Stipišić, Renato, Rušić, Davor, Alar, Ž., Jakovljević, S., and Šolić , S.
- Subjects
copper ,synthetic zeolite X ,isotherms ,reactor design - Abstract
In the last few decades the importance of environmental protection, among other things, resulted in the intensive study of zeolites as ion-exchangers. Use of this technique has dual application: for the removal of heavy metals from wastewaters and for the preparation of catalysts. For this reasons the equilibrium of sorption of copper ions from aqueous solutions using synthetic zeolite X has been studied by a batch technique. The experimental data obtained at constant temperature for the different initial concentrations of copper solutions have been analyzed using six types of isotherm models Two two-parameter isotherms, two three-parameter isotherms and two four-parameter isotherms. Non-linear regression method was used in order to calculate parameters of the isotherms. According to chi-square value the most appropriate equation for describing experimental equilibrium data was Radke-Prausnitz isotherm. This isotherm was combined with reactor model for batch reactor design.
- Published
- 2013
39. KINETIC STUDY OF CALCIUM SULFOALUMINATE CEMENT HYDRATION
- Author
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Ukrainczyk, Neven, Franković-Mihelj, Nirvana, Šipušić, Juraj, Alar, Ž, Jakovljević, S, and Šolić, S
- Subjects
calcium sulfoaluminate cement ,waste minimization ,calorimetry ,hydration kinetics ,numerical modeling - Abstract
Calcium sulfoaluminate cement (CSAC) is an alternative binder to Portland cement (PC). Advantages in producing CSAC over PC are in lower CO2 emission and lower energy consumption. In this paper, a variety of industrial wastes, namely phosphogypsum, coal bottom ash and electric arc furnace slag were used as raw materials to provide additional environmental advantages in production of calcium sulfoaluminate cement. Hydraulic minerals in the prepared CSA were determined by X‐ray powder diffraction. Rate of heat generation during hydration had been determined by calorimetric measurements. It was observed that the main heat generation peak can exhibit two exothermic processes. A numerical model for the hydration kinetics is a proposed, based on solving system of two differential kinetic equations, for two interdependent reactions, employing Runge‐Kutta IV method. n conclusion, CSAC production offers an alternative and feasible method of industrial waste minimization.
- Published
- 2013
40. Utjecaj toplinske obrade žarenjem na svojstva mikrostrukturnih konstituenata AlSi8Cu3 legure
- Author
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Zovko Brodarac, Zdenka, Stanić, Davor, Terzić, Katarina, Alar, Ž., Jakovljević, S., and Šolić, S.
- Subjects
Al-Si legura ,mikrostruktura ,toplinska obrada - Abstract
Podeutektičke aluminij – silicij ljevačke legure poput AlSi8Cu3 (EN AC 46200) su od osnovne komercijalne važnosti zbog široke primjene za automobilske sigurnosne komponente poput dijelova motora. Svojstva legure nastoje se poboljšati dizajniranjem materijala putem odabira kemijskog sastava, obradom taljevine cijepljenjem i modifikacijom, toplinskom obradom i ispravno proračunatom tehnologijom lijevanja. Kod odljevaka kompleksne geometrije ponekad je neophodno nakon lijevanja provesti postupak toplinske obrade žarenjem. Rigorozni režim s relativno visokom temperaturom i dužim vremenom zadržavanja indicira mikrostrukturne promjene u materijalu, a time indirektno utječe na mehanička svojstva materijala. Važan aspekt za daljnja poboljšanja i primjenu je bolje razumijevanje mikrostrukturnih i mehaničkih značajki legure usporedbom mikrostrukturnih i mehaničkih značajki sa i bez primjene naknadne toplinske obrade. Cilj ovog rada bio je utvrditi promjenu u svojstvima mikrostrukturnih konstituenata odvojeno lijevanih ispitnih uzoraka AlSi8Cu3 legure uslijed provedenog žarenja. Metalografskim metodama su ustanovljeni sljedeći mikrostrukturni konstituenti: primarni dendriti αAl, eutektik (αAl + βSi) i intermetalne faze na osnovi bakra stehiometrije AlxCu, AlxMgySizCuw. Mikrostruktura nakon toplinske obrade žarenjem doživljava promjene u smislu ravnomjernije raspodjele dendrita primarnog aluminija, obogaćivanja istog bakrom, te usitnjavanjem posljednjih skrućujućih faza na osnovi bakra. Utvrđene su odgovarajuće promjene u raspodjeli, udjelu, izduženju i mikrotvrdoći toplinski obrađenih uzoraka u odnosu na one u primarnom lijevanom stanju.
- Published
- 2013
41. THE OFFSET PRINTING PLATE CHARACTERISTICS RELATED TO DEVELOPING PROCESS
- Author
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Cigula, Tomislav, Mahović Poljaček, Sanja, Tomašegović, Tamara, Gojo, Miroslav, Alar, Ž., and Jakovljević, S.
- Subjects
lithography ,printing plate ,developing process - Abstract
Offset printing is one of the most common printing techniques used today. It is characterized by two features, the printing ink is not transferred directly from the printing plate to the printing substrate and the selective ink adsorption in the printing process is achieved by opposite physical-chemical properties of printing and nonprinting areas. The majority of the printing plates are built from aluminium foil, which is chemically and electrochemically processed in order to form rough and porous aluminium-oxide film and coated by a photoactive coating. In the plate-making process the plate is exposed to a certain electromagnetic irradiation and then developed to remove parts of the photoactive coating. The developing solutions are in often highly alkaline solution and could dissolve aluminium oxide layer. The aim of this paper is to determine the influence of the developer temperature on the printing plate characteristics. For that purpose, printing plate samples were made by varying developer temperature. Contact angle was measured to evaluate developer’s temperature influence on the nonprinting areas, and coverage values were measured for evaluation of the image elements transfer on the printing plate. The results have shown that the developer’s temperature influences both, the printing and nonprinting areas. The contact angle on the nonprinting areas has polynomial dependence on the developer temperature while increase of the developer temperature causes coverage values to decrease. This research has proved that changing developer temperature in the plate-making process influences printing and nonprinting areas which makes it a significant parameter to watch and optimize for every plate-making process to ensure best possible results in reproduction.
- Published
- 2013
42. Usage durability of functionally printed textile materials
- Author
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Tomljenović, Antoneta, Zjakić, Igor, Rolich, Tomislav, Anadolac, Adi, Alar, Ž., and Jakovljević, S.
- Subjects
textile materials ,knitted fabrics ,printing ,usage and care simulation ,wear - Abstract
With the purpose of durability evaluation of the textile materials in conditions of use, the paper investigates the quality of three white knitted fabrics, of different structural and construction characteristics, intended for shirts. In order to transfer readable information, on each of the fabrics were printed two QR codes with different amounts of information in two sizes using screen-printing and transfer printing techniques. On non-printed and functionally printed fabrics, with the purpose of monitoring the influence of simulated wear and care, were determined dimensional changes after multiple cycles of washing and drying, and abrasion resistance and a tendency to surface pilling using Martindale abrader as well. It was defined the usage quality of fabrics, the effect of simulated application on aesthetic properties of the finished product, the impact of wearing on materials mass loss, print color fastness and readability of printed information on the carrier medium. It was found that structural characteristics of knitted fabrics, their dimensional stability, the number of washing and drying cycles, and the number of wear cycles performed, the printing technique and size of black modules in QR code as well have an influence on the results obtained.
- Published
- 2012
43. Image Analysis of Old Glagolitic Books Based on Photographic Digitalization
- Author
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Modrić, Damir, Radošević, Danijel, Alar, Ž, and Jakovljević, S
- Subjects
photographic digitalization ,pseudo3D ,glagolitic books ,printing press - Abstract
The area of Glagolitic script and the first printed books in Glagolitic is technically and technologically poorly explored. The possibility of technical support (or possibly a denial), by photographic digitalization and analysis of the digital records with ImageJ program, of historical knowledge and assumptions about the origins of the printing in Croatia is presented in the paper. Digital records of individual pages of the books and their pseudo3D views indicate that the presented method can identify the typical impression – ‘fingerprint’ of the printing presses and, based on these method, particular book can be 'joined' to the particular printing press.
- Published
- 2012
- Full Text
- View/download PDF
44. Prediction of working stress of cold-work tool steel
- Author
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Smoljan, Božo, Smokvina Hanza, Sunčana, Iljkić, Dario, Grilec, K., Marić, G., and Jakovljević, S.
- Subjects
stomatognathic system ,technology, industry, and agriculture ,mechanical properties ,working stress ,plastic deformation ,fracture ,tool steel - Abstract
Working stress depends on fracture resistance and on deformation resistance. Fracture toughness represents fracture resistance, whereas yield strength and modulus of elasticity characterize deformation resistance. Fracture toughness and yield strength directly depend on steel microstructure, opposite modulus of elasticity, which is the most insensitive property to structure transformations in steel. The main influence factors on fracture resistance and on deformation resistance are presented in this paper, as well as the methods of fracture and deformation resistance usage in design of safety of engineering component application.
- Published
- 2008
45. Prospective evaluation of serum and peritoneal fluid markers as indicators of postoperative complications in patients with enteric anastomosis.
- Author
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Kasalović M, Odalović B, Mihajlović L, Jakovljević S, Elek Z, Igrutinović G, Anđelković M, and Pajčin M
- Subjects
- Humans, Female, Prospective Studies, Male, Middle Aged, Aged, Immunoglobulin A analysis, Immunoglobulin A blood, Colorectal Neoplasms surgery, Surgical Wound Dehiscence etiology, Adult, Serum Albumin analysis, Biomarkers blood, Biomarkers analysis, Postoperative Complications etiology, Anastomosis, Surgical adverse effects, L-Lactate Dehydrogenase analysis, L-Lactate Dehydrogenase blood, Ascitic Fluid metabolism, Lactic Acid blood, Lactic Acid analysis
- Abstract
Background: Postoperative complications of colorectal cancer surgery contribute to increased morbidity and mortality in patients., Objectives: Investigate the role of biochemical markers in serum and peritoneal fluid in the development of postoperative complications in patients with enteral anastomosis., Design: Prospective., Setting: University hospitals., Patients and Methods: The studied population consisted of patients who underwent surgical treatment with created anastomosis or Hartmann's resection from April 2022 to April 2024, conducted at the Clinical-Hospital Center Kosovska Mitrovica and the University Clinical Center Kragujevac. Spearman's correlation coefficient (r
s ) was used to test associations between categorical variables., Main Outcome Measures: Lactate, albumin, lactate dehydrogenase, and IgA antibodies were monitored as predictors of anastomotic dehiscence and general postoperative complications., Sample Size: 52., Results: The concentration of lactate in the drain fluid on the third postoperative day was statistically significantly higher in patients who did not develop anastomotic dehiscence ( P =.006). The concentration of IgA antibodies in the drain fluid on the third and fifth days post-surgery showed a moderate negative correlation with lactate concentration (rs =-.670, P =.012; rs =-.577, P =.039), repectively. There was a significantly higher concentration of albumin in the drain fluid on the third day post-surgery in patients who developed dehiscence ( P =.040), and on the seventh day post-surgery in those who did not develop dehiscence ( P =.001). The concentration of LDH on the third day in the drain fluid after surgery was statistically significantly higher in patients who did not develop dehiscence ( P =.020). There was a statistically significant difference in lactate concentration in the drain fluid on the third ( P <.001) and fifth days ( P =.041) post-surgery, as well as in albumin concentration on the third day post-surgery ( P =.024) with respect to the development of general postoperative complications., Conclusion: This study revealed significant differences in the concentrations of lactate, albumin, and LDH in the drain fluid on the third and fifth days post-surgery with respect to the development of complications. These results suggest that monitoring these markers may help in the early identification of patients at risk of complications such as dehiscence., Limitations: Limited literature on specific aspects of this study, including the absence of a control group, small sample size, and two-center study.- Published
- 2024
- Full Text
- View/download PDF
46. Specific Erosion Resistance Behaviour of Cold Forged and Angular Extruded Aluminium.
- Author
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Keran Z, Jakovljević S, Runje B, Ciganović I, and Ćorić D
- Abstract
Aluminium finds wide application in mechanical engineering due to its low density and corrosion resistance. In this research, aluminium was subjected to two different metal forming technologies-cold forging (upsetting) and equal channel angular pressing (ECAP)-to obtain improvement in its exploitation properties. Parallel to changing mechanical properties by using these two processes, there was a change in the microstructure of the material. The resulting microstructures were examined using an optical microscope. A different treated aluminium was subjected to erosion wear in various time intervals. Wear testing was conducted for two different impingement angles causing abrasive wear and impact wear. The erosion mechanisms were examined by scanning electron microscopy. These results showed that there is no statistically significant difference in erosion wear for different states at the same impingement angle. However, the difference is noticeable at different wear angles. The significance of the difference in wear of the samples treated with the forging and ECAP techniques was validated by statistical analysis with tests of different sensitivities. The results of the t -test showed that ECAPed samples present a statistically significant difference in the loss of mass due to variations in erosion angle during the 30, 45, and 60 min wearing. A substantial difference in the change in sample mass is also visible for the forged state worn for 60 min.
- Published
- 2024
- Full Text
- View/download PDF
47. Synthesis and Characterization of ZnO and TiO 2 Hybrid Coatings for Textile UV Anti-Aging Protection.
- Author
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Somogyi Škoc M, Macan J, Jakovljević S, and Rezić I
- Abstract
The aim of this study was to prepare and characterize thin hybrid films on polyurethane-coated knitted fabrics and to achieve satisfactory color fastness to artificial light. Sol-gel-derived hybrid thin films were deposited via the dip-coating of 3-glycidoxypropiltrimethoxysilane. Titanium dioxide (TiO
2 ) and zinc oxide (ZnO) nanopowders were added to compensate for the insufficient aging resistance, which manifests itself in low color fastness and is one of the most frequent complaints from manufacturers of coated marine fabrics (yachts, boats, etc.). The optimum processing conditions were determined by varying the concentration of precursors and auxiliaries, the mass concentration of TiO2 and ZnO nanopowders, the drawing speed, and the methods and process of fabric treatment. The hybrid films were also characterized using scanning electron microscopy and Fourier transform infrared spectroscopy with attenuated total internal reflection, while Spectraflash SF 300 investigated color fastness. After 300 h of exposure in a xenon chamber, the thin hybrid films showed good color fastness and good resistance to washing cycles. The sol-gel treatment proved to be a successful answer to the manufacturers' need for the post-treatment of polyurethane-coated knitted fabrics against UV radiation for use in the marine sector (yachts, speedboats, etc.).- Published
- 2024
- Full Text
- View/download PDF
48. Assessment of stability and bioactive compounds in yogurt containing novel natural starter cultures with the ability to promote longevity in Caenorhabditis elegans.
- Author
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Dinić M, Jakovljević S, Popović N, Radojević D, Veljović K, Golić N, and Terzić-Vidojević A
- Abstract
Yogurt represent one of the oldest fermented foods containing viable lactic acid bacteria and many bioactive compounds that could exhibit beneficial effects on human health and train our immune system to better respond to invading pathogens. Streptococcus thermophilus and Lactobacillus delbrueckii ssp. bulgaricus are commonly used for yogurt preparation under controlled temperature and environmental conditions. In this study, we investigated probiotic features of S. thermophilus BGKMJ1-36 and L. bulgaricus BGVLJ1-21 strains isolated from artisanal sour milk and yogurt by using Caenorhabditis elegans as an in vivo model system. Further, we evaluated content of total fat, saturated fatty acids, proteins, and lactose, as well as vitamins and AA of yogurt prepared from above-mentioned starter cultures during 21 d of storage at 4°C to get insights of final product stability. We showed that S. thermophilus BGKMJ1-36 and L. bulgaricus BGVLJ1-21 strains applied in combination upregulated the expression of autophagy-related genes in C. elegans. Beside autophagy, we observed activation of TIR-1-dependent transcription of lysozyme-like antimicrobial genes involved in the immune defense of C. elegans. Upregulation of these genes strongly correlates with an increase in the longevity of the worms fed with yogurt culture bacteria. Further, we showed that yogurt prepared with S. thermophilus BGKMJ1-36 and L. bulgaricus BGVLJ1-21, as a final product, is rich with vitamin B
2 and dominant AA known by their prolongevity properties. Taken together, our study pointed to the beneficial features of the tested starter cultures and yogurt and highlighted their potential to be used as a fermented food with added-value properties., (© 2023, The Authors. Published by Elsevier Inc. and Fass Inc. on behalf of the American Dairy Science Association®. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).)- Published
- 2023
- Full Text
- View/download PDF
49. Production of Open-Cell Metal Foams by Recycling of Aluminum Alloy Chips.
- Author
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Jozić S, Lela B, Krolo J, and Jakovljević S
- Abstract
In this paper, an innovative sustainable method of producing metal foams was presented. The base material was aluminum alloy waste in the form of chips obtained by machining process. The leachable agent, used to create pores in the metal foams, was natrium chloride, which was later removed by leaching, resulting in metal foams with open cells. Open-cell metal foams were produced with three different input parameters: volume percentage of natrium chloride, compaction temperature, and force. The obtained samples were subjected to compression tests during which displacements and compression forces were measured to obtain the necessary data for further analysis. To determine the influence of the input factors on the selected response values such as relative density, stress and energy absorption at 50% deformation, an analysis of variance was performed. As expected, the volume percentage of natrium chloride was shown to be the most influential input factor because it has a direct impact on the obtained metal foam porosity and thus on the density. The optimal values of the input parameters with which the metal foams will have the "most desirable" performances are a 61.44% volume percentage of natrium chloride, a compaction temperature of 300 °C and a compaction force of 495 kN.
- Published
- 2023
- Full Text
- View/download PDF
50. Specific Physical Ability Prediction in Youth Basketball Players According to Playing Position.
- Author
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Ivanović J, Kukić F, Greco G, Koropanovski N, Jakovljević S, and Dopsaj M
- Subjects
- Acceleration, Adolescent, Adult, Body Height, Humans, Lower Extremity, Male, Young Adult, Athletic Performance, Basketball
- Abstract
This study investigated the hierarchical structure of physical characteristics in elite young (i.e., U17-U19) basketball players according to playing positions. In addition, their predictive value of physical characteristics was determined for the evaluation of players' physical preparedness. Sixty elite male basketball players performed 13 standardized specific field tests in order to assess the explosive power of lower limbs, speed, and change-of-direction speed. They were divided into three groups according to playing positions (guard [ n = 28], forward [ n = 22], center [ n = 10]). The basic characteristics of the tested sample were: age = 17.36 ± 1.04 years, body height = 192.80 ± 4.49 cm, body mass = 79.83 ± 6.94 kg, and basketball experience = 9.38 ± 2.10 years for guards; age = 18.00 ± 1.00 years, body height = 201.48 ± 3.14 cm, body mass = 90.93 ± 9.85 kg, and basketball experience = 9.93 ± 2.28 years for forwards; and age = 17.60 ± 1.43 years; body height = 207.20 ± 3.29 cm, body mass = 104.00 ± 9.64 kg, and basketball experience = 9.20 ± 1.62 years for centers. For all playing positions factor analysis extracted three factors, which cumulatively explained 76.87, 88.12 and 87.63% of variance, respectively. The assessed performance measures were defined as significant ( p < 0.001), with regression models of physical performance index (PP
INDEX ). PPINDEX of guards = -6.860 + (0.932 × t -test) - (1.656 × Acceleration 15 m) - (0.020 × Countermovement jump); PPINDEX of forwards = -3.436 - (0.046 × Countermovement jump with arm swing) - (1.295 × Acceleration 15 m) + (0.582 × Control of dribbling); PPINDEX of centers = -4.126 + (0.604 × Control of dribbling) - (1.315 × Acceleration 15 m) - (0.037 × Sargent jump). A model for the evaluation of physical performance of young basketball players has been defined. In addition, this model could be used as a reference model for selection procedures, as well as to monitor the efficacy of applied training programmes within the short, medium and long-term periodization.- Published
- 2022
- Full Text
- View/download PDF
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