INFLUENCE OF PHYSICAL TRAINING ON CARDIORESPIRATORY ENDURANCE IN PREADOLESCENT AGE

Cardiorespiratory or aerobic endurance is the ability of the whole body to sustain physical activity for an extended period of time, involving relatively large groups of muscles. The attitudes on the possible impact of training on cardiorespiratory endurance in preadolescents are contradictory. Our study enrolled 195 boys aged 11 to 12 years. Experimental group (n=92) consisted of the children who had been involved with planned and programmed water polo training for at least two years. Control group (n=103) consisted of schoolchildren who only had had regular physical education in schools. Our investigation protocol included standardized anthropometric measurements and tests, performed respecting the appropriate protocols. Statistical analysis of the results demonstrated that there were no significant differences in age and relative values of oxygen consumption (VO2peak). Body height and mass, as well as the skinfold thickness, were significantly higher in experimental group subjects. The values of absolute VO2peak, FVC and FEV1.0 were also significantly higher in the examinees involved with water polo training. These findings stress the importance of a systematic training process even in this early period of growth and development in order for the trainees to acquire important functional advantages. We believe that a properly planned and programmed physical training can significantly contribute to the development of cardiorespiratory endurance even as early as preadolescent age

Laboratorijsko postrojenje za prečišćavanje i magnetnu obradu otpadnih voda

In this paper we present the description of laboratory installation for filtration and magnetic treatment of oiled waste water, whose integral parts are the magnets for magnetic treatment of water, and attached is equipment for electrical power supply, magnetic measurement, control and protection of overheating Addition to basic application of this installation is that it can be used for testing and monitoring of the effects of magnetic treated water which is used in different fields of industry, agriculture, medicine, etc.U radu je dat prikaz laboratorijskog postrojenja za prečišćavanje i magnetnu obradu zauljenih otpadnih voda. Sastavni deo postrojenja su i magneti za magnetnu obradu vode sa pratećom opremom za električno napajanje, magnetna merenja, regulaciju i zaštitu od preteranog zagrevanja. Pored osnovne namene postrojenje može da se koristi i za ispitivanje efekata magnetne obrade vode za primenu u različitim oblastima industrije, poljoprivrede, medicine i dr

Developing Relative Humidity and Temperature Corrections for Low-Cost Sensors Using Machine Learning

Existing government air quality monitoring networks consist of static measurement stations, which are highly reliable and accurately measure a wide range of air pollutants, but they are very large, expensive and require significant amounts of maintenance. As a promising solution, low-cost sensors are being introduced as complementary, air quality monitoring stations. These sensors are, however, not reliable due to the lower accuracy, short life cycle and corresponding calibration issues. Recent studies have shown that low-cost sensors are affected by relative humidity and temperature. In this paper, we explore methods to additionally improve the calibration algorithms with the aim to increase the measurement accuracy considering the impact of temperature and humidity on the readings, by using machine learning. A detailed comparative analysis of linear regression, artificial neural network and random forest algorithms are presented, analyzing their performance on the measurements of CO, NO2 and PM10 particles, with promising results and an achieved R2 of 0.93–0.97, 0.82–0.94 and 0.73–0.89 dependent on the observed period of the year, respectively, for each pollutant. A comprehensive analysis and recommendations on how low-cost sensors could be used as complementary monitoring stations to the reference ones, to increase spatial and temporal measurement resolution, is provided

Building Low-Cost Sensing Infrastructure for Air Quality Monitoring in Urban Areas Based on Fog Computing

Because the number of air quality measurement stations governed by a public authority is limited, many methodologies have been developed in order to integrate low-cost sensors and to improve the spatial density of air quality measurements. However, at the large-scale level, the integration of a huge number of sensors brings many challenges. The volume, velocity and processing requirements regarding the management of the sensor life cycle and the operation of system services overcome the capabilities of the centralized cloud model. In this paper, we present the methodology and the architectural framework for building large-scale sensing infrastructure for air quality monitoring applicable in urban scenarios. The proposed tiered architectural solution based on the adopted fog computing model is capable of handling the processing requirements of a large-scale application, while at the same time sustaining real-time performance. Furthermore, the proposed methodology introduces the collection of methods for the management of edge-tier node operation through different phases of the node life cycle, including the methods for node commission, provision, fault detection and recovery. The related sensor-side processing is encapsulated in the form of microservices that reside on the different tiers of system architecture. The operation of system microservices and their collaboration was verified through the presented experimental case study

Review of friction stir processing (Fsp) parameters and materials for surface composites

This paper presents a review of important aspects related to the Friction Stir Welding and Friction Stir Processing (FSW/FSP) concepts. The FSP, as a variation of the FSW, uses the same principle, but instead of the material joining, the FSP focuses on a surface modification aiming at improving surface properties of the substrate material. Thin surface composites can be made either by using grooves or drilled holes. FSP process parameters have been elaborated: axial force, rotational and traverse speed, tilt angle, insertion depth and tool geometry, as well as number of passes. Review of the used materials in fabrication of composites by using FSP is shortly presented. Effects of the FSP on mechanical properties have been discussed: effects on the microstructure, hardness and wear properties, tensile strength, and fracture and defects formation. FSP has evolved as an efficient method to modify surface structures, especially important for metallic materials that exposed to different harsh conditions, and further research will enable its wider use in industry

BLIND SERBIAN RULERS AND FAMOUS PERSONS

History and medicine were an integral part of life-being of blind serbian acters. One of the main actors was half-blind serbian ruler, Stefan of Decani and whose name was associated with first ophthalmologic hospital and precursor of the eye`s injuries care. After, national reputation as Stefan Blind Righteous, ruler of the Serbian despot between 1458. and 1459. (member of Brankovic`s dinasty), and he was blinded by eye injuries burns. The famous national was also Filip Visnjic, as blind minstrel and authentic creator of serbian folk traditions, with sequels as a child, by bilateral infective panuveitis

The Influence of Different SARS-CoV-2 Strains on Changes in Maximal Oxygen Consumption, Ventilatory Efficiency and Oxygen Pulse of Elite Athletes

Purpose: The aim of this study was to evaluate the influence of different SARS-CoV-2 strains on the functional capacity of athletes. Methods: In total, 220 athletes underwent cardiopulmonary exercise testing (CPET) after coronavirus infection and before returning to sports activities. Eighty-eight athletes were infected by the Wuhan virus, and 66 were infected during the Delta and Omicron strain periods of the pandemic. Results: The CPET results showed significantly decreased maximal oxygen consumption, ventilatory efficiency, and oxygen pulse in athletes who were infected with Wuhan and Delta strains compared to athletes who suffered from Omicron virus infection. An early transition from aerobic to anaerobic metabolic pathways for energy production was observed in the Wuhan and Delta groups but not in athletes who were infected with the Omicron strain. There were no differences in the obtained results when Wuhan and Delta virus variants were compared. Conclusion: These results suggest that the Wuhan and Delta virus strains had a significantly greater negative impact on the functional abilities of athletes compared to the Omicron virus variant, especially in terms of aerobic capacity and cardiorespiratory function

Long-term and low-temperature annealing of as-continuous drive friction welded and post-weld heat treated Al/Cu bimetal joints

In general, continuous drive friction welding (CDFW) of two metals may produce three typical regions from a weld interface towards an unaf- fected base metal: (i) fully deformed or dynamically recrystallized (DRX) region, (ii) partially deformed region or thermo-mechanically affected zone (TMAZ), and (iii) undeformed region or heat affected zone (HAZ). In past studies, it has been shown that different CDFW parameters may differently affect the size and structural properties of these regions. Re- garding the Al/Cu bimetal joints, past studies have also indicated that the self- and inter-diffusion of Al and Cu along the short-circuits (dislocations and/or grain boundaries) is the mechanism which probably controls the growth of detrimental AlxCuy intermetallics at the Al/Cu interface when the temperatures are lower than 350°C. Considering the previous and that the permissible operating temperature in Al/Cu and other electrical con- nections is generally between 100 and 150°C, as well as that the structural changes in DRX, TMAZ, and HAZ regions are expected to be slower at these operating conditions, it is reasonable to assume that the growth kinet- ics of AlxCuy intermetallics under these conditions might be different in the cases of Al/Cu joints produced with different CDFW parameters and/or in the cases of post-weld heat treated Al/Cu joints. The aim of the present study was to evaluate the effects of different CDFW parameters and post- weld heat treatment on the formation of AlxCuy intermetallics on the Al/Cu interfaces of produced joints when they were submitted to long-term and low temperature annealing (similar to mentioned operating conditions). Structural properties were analyzed be using the light microscopy and scanning electron microscopy

Quality of life of the mechanically ventilated patients with community acquired pneumonia

© 2018, Inst. Sci. inf., Univ. Defence in Belgrade. All rights reserved. Background/Aim. Patients with pneumonia who require mechanical ventilation (MV) are associated with several poor outcomes such as prolonged hospitalization, higher rate of mortality and increased spread of antibioticsresistant pathogens. MV in patients with communityacquired pneumonia (CAP) could cause development of psychological symptoms, often neglected in the Intensive Care Units (ICU) as well as decreased quality of life after the withdrawal of the MV. The aim of the study was to evaluate the quality of life in patients with CAPs treated with MV in ICU. Methods. The study was designed as a cohort study of hospital-treated patients with CAP with prospective data collection. The quality of life was defined as the primary outcome, while the use of MV was assumed as the primary prognostic factor that adversely affected the outcome. The patients were recruited from the population of patients with CAPs who were hospitalized at the ICU, Clinical Center Kragujevac, Serbia, from January 2013 to January 2014. The experimental group consisted of patients who were on MV while the control group included patients who were treated for CPAs in the ICU, but were not subjected to MV. The quality of life was assessed by using patient-rated Euro Quality of Life (EuroQoL) Group-EQ-5D index. The calculation of the total EQ-5D-5L score values was performed by using the predefined, validated mapping key according to response combinations. Statistical analysis was performed by using χ2 test, Student's t-test, univariate and multivariate logistic regression analyses. Results. The patients with MV had worse EQ5D-5L values in comparison to the control group for all 5 domains. Mobility, self-care and usual activities were negatively affected during the whole follow-up period. Pain or discomfort and anxiety or depression differed significantly between the study group and the control group at days 7 and 30. Conclusion. Patients with MV tend to have poorer quality of life, especially in 3 domains. The main reasons are the presence of chronic comorbidities in the population that require MV

SYNCHRONOUS MANEC (MIXEDADENO-NEUROENDOCRINE CARCINOMA) OF THE COLON AND RENAL CELL CARCINOMA-CASE REPORT

Synchronous multiple carcinomas represent two or more primary carcinoma that occur sumultaneously in the same patient. In order to fulfill the condition that tumors are synchronous, each tumor must be primary and not a metastasis of another tumor. The occurrence of renal carcinoma synchronously with colonic carcinoma is not so common. On the other hand, the pathohistological image in rare cases shows a mixed glandular and neuroendocrine component described in earlier works. In this paper, we present a patient who made a colonoscopy, a biopsy from a tumor change in the cecum due to malady, fainting, loss of appetite, and a positive test for faecal occult bleeding, and confirmed that it is an a-denocarcinoma of the cecum. Multi slise computerized tomography of the abdomen also described a tumor change in the uretero-pelocalrix system of the left kidney region. The patient had no urinary tract disorders. The diagnosis of the synchronous tumor of the cecum and left kidney was set. A right hemicolectomy with latero-lateral ileo-transverse anastomosis, as well as left nephroureterectomy, was performed. What is particularly interesting in this case is that the pathohistological picture of the cecum carcinoma shows a rare form of tumor tone, mixed adeno-neuroendocrine carcinoma. In patients with diagnosed colorectal cancer, routine as well as additional preoperative diagnostic procedures should be performed to exclude the existence of kidney cancer, since, when synchronous with colorectal carcinoma occurs, renal carcinoma is mainly asymptomatic. In rare cases, the pathohistological picture may also show the neuroendocrine component of the tumor, which directs further therapy to the other direction