18 research outputs found
HIGH SCHOOLERS FOR HIGH SCHOOLERS AS SUPPORT TO STUDENTS\u27 SOCIAL-EMOTIONAL AND INTERPERSONAL (SEI) COMPETENCES ENFORCEMENT
It is with great interest that the modern society of today has been discussing the \u27society of knowledge\u27
and the \u27society of education\u27, putting great emphasis on the professional and educational
role of the teacher and environment within the process of a life-long education of students. The
project in question was set up to correspond with the idea of the comprehensive curricular reform
of the Croatian education system together with the programme \u27School for Life\u27, and it aims to
encourage and develop social-emotional as well as interpersonal (SEI) competences in students and
teachers, taking into consideration that the competences in question have been proven to have a
positive effect on students\u27 academic success and skills improvement, as well as on their general
development. A secondary goal of the project was to present good practice examples with special
attention paid to activities of prevention in a partner-school, with students as mediators. This
research was undertaken as a part of the \u27High Schoolers for High Schoolers\u27 project, from October
2018 to April 2019, in form of a single visit to both schools, which included interactive workshops
previously prepared by schools. The workshops were conducted by students mediators, that is four
senior grade students from XV. gimnazija as members of a psychology-group, and five 11th-grade
students mediators from Gimnazija Josipa Slavenskog in Äakovec. Forty-five 9th- and 11th-grade
students from XV. gimnazija and seventy-five 9th- and 10th-grade students from Gimnazija Josipa
Slavenskog participated in the project. A test sample consisted of four students mediators and fortyfive
students participants from XV. gimnazija. As for the project evaluation, two short questionnaires
were designed, depending on the role of the examinees in the project (student mediator or student
participant), with a 5 point Likert scale to be completed at the end of a visit. A descriptive data
analysis was conducted using the SPSS 20.0 system, and the process and content evaluation results
show a stronger collaboration effect, as well as a stronger satisfaction level in terms of collaboration,
in case of students mediators than in case of other students participants, in almost all estimated
items. The results support further collaboration of this kind
Digital image correlation method in experimental analysis of fracture mechanics parameters
U okviru rada su predstavljeni principi i primeri savremenih eksperimentalnih metoda za odreÄivanje parametara mehanike loma. Metodologija analize i odreÄivanja parametara mehanike loma obuhvatila je analizu ponaÅ”anja metalnih materijala u odnosu na lom primenom modifikovanih epruveta mehanike loma, sa inicijalnom prslinom i zateznim optereÄenjem, i imala je za cilj pre svega odreÄivanje karaktera tih procesa u sluÄaju problema tankih ploÄica, uz koriÅ”Äenje osnovnih postulata mehanike loma. Metodologija ukljuÄuje primenu eksperimentalnih postupaka mehanike loma definisanih standardima, uz primenu metode za trodimenzionalno stereoskopsko merenje mehaniÄkog ponaÅ”anja materijala. PomoÄu sistema za korelaciju digitalnih slika (Digital Image Correlation, DIC) za ispitivanje deformacija i pomeranja u materijalu ispitani su parametri mehanike loma metalnih materijala, pre svega epruveta od 316L nerÄajuÄeg Äelika i titan legure Ti-6Al-4V. 3D optiÄki sistem GOM i softver Aramis su koriÅ”Äeni za izvoÄenje eksperimentalne analize na pripremljenim epruvetama. PoÅ”to se ovaj sistem koristi za merenje deformacija i parametra pomeranja otvaranja vrha prsline CTOD na modifikovanim kompaktnim epruvetama za zatezanje C(T) i epruvetama sa zarezom, dat je i kratak pregled mernih procedura i procesiranja rezultata, kao i moguÄe primene ovog sistema. Prikazani rezultati daju pregled polja deformacija i pomeranja tokom otvaranja vrha prsline, rasta prsline i u trenutku loma epruvete, Å”to nije moguÄe putem tradicionalnih metoda merenja. Analizom rezultata pokazano je da je sa velikom preciznoÅ”Äu moguÄe izmeriti pomeranja tokom otvaranja vrha prsline i dobiti CTOD parametar. Rezultati pokazuju da odabrana metoda pruža dobre rezultate u analizi mehaniÄkog ponaÅ”anja i odreÄivanju parametara mehanike loma metalnih materijala.The principles and examples of state-of-the-art experimental methods for measuring the fracture mechanics parameters are presented in this paper. The methodology of experimental analysis of the fracture mechanics parameters includes investigation of fracture behaviour of metallic materials using modified specimens with initial crack under tensile load, with the primary goal of determining the characteristics of fracture processes for the case of thin plates, using basic fracture mechanics postulates. The methodology also includes the application of experimental fracture mechanics procedures as defined by standards, using three-dimensional stereo-metric mechanical behaviour measurement methods. Fracture behaviour of metallic materials, mainly 316L stainless steel and titanium alloy Ti-6Al-4V specimens, is analyzed by using a digital image correlation (DIC) system for measuring strain and displacement in the material. GOM three-dimensional optical system and Aramis software are used to perform experimental analysis of selected specimens. As this system is used to measure strain and crack tip opening displacement (CTOD) parameter on the modified compact tension specimen C(T) and notch specimens, a basic review of measuring procedures and result processing is given, alongside other possible applications for this system. The presented results show strain and displacement fields during crack tip opening, crack growth, and the moment of fracture of specimens, which are not possible using traditional measurement methods. The analysis of results shows that it is possible to measure displacements during crack tip opening with a great precision, and thus obtain the CTOD parameter. The results show that the selected measuring method obtains good results in the analysis of mechanical behaviour and fracture mechanics parameters of metallic materials
Digital image correlation method in experimental analysis of fracture mechanics parameters
U okviru rada su predstavljeni principi i primeri savremenih eksperimentalnih metoda za odreÄivanje parametara mehanike loma. Metodologija analize i odreÄivanja parametara mehanike loma obuhvatila je analizu ponaÅ”anja metalnih materijala u odnosu na lom primenom modifikovanih epruveta mehanike loma, sa inicijalnom prslinom i zateznim optereÄenjem, i imala je za cilj pre svega odreÄivanje karaktera tih procesa u sluÄaju problema tankih ploÄica, uz koriÅ”Äenje osnovnih postulata mehanike loma. Metodologija ukljuÄuje primenu eksperimentalnih postupaka mehanike loma definisanih standardima, uz primenu metode za trodimenzionalno stereoskopsko merenje mehaniÄkog ponaÅ”anja materijala. PomoÄu sistema za korelaciju digitalnih slika (Digital Image Correlation, DIC) za ispitivanje deformacija i pomeranja u materijalu ispitani su parametri mehanike loma metalnih materijala, pre svega epruveta od 316L nerÄajuÄeg Äelika i titan legure Ti-6Al-4V. 3D optiÄki sistem GOM i softver Aramis su koriÅ”Äeni za izvoÄenje eksperimentalne analize na pripremljenim epruvetama. PoÅ”to se ovaj sistem koristi za merenje deformacija i parametra pomeranja otvaranja vrha prsline CTOD na modifikovanim kompaktnim epruvetama za zatezanje C(T) i epruvetama sa zarezom, dat je i kratak pregled mernih procedura i procesiranja rezultata, kao i moguÄe primene ovog sistema. Prikazani rezultati daju pregled polja deformacija i pomeranja tokom otvaranja vrha prsline, rasta prsline i u trenutku loma epruvete, Å”to nije moguÄe putem tradicionalnih metoda merenja. Analizom rezultata pokazano je da je sa velikom preciznoÅ”Äu moguÄe izmeriti pomeranja tokom otvaranja vrha prsline i dobiti CTOD parametar. Rezultati pokazuju da odabrana metoda pruža dobre rezultate u analizi mehaniÄkog ponaÅ”anja i odreÄivanju parametara mehanike loma metalnih materijala.The principles and examples of state-of-the-art experimental methods for measuring the fracture mechanics parameters are presented in this paper. The methodology of experimental analysis of the fracture mechanics parameters includes investigation of fracture behaviour of metallic materials using modified specimens with initial crack under tensile load, with the primary goal of determining the characteristics of fracture processes for the case of thin plates, using basic fracture mechanics postulates. The methodology also includes the application of experimental fracture mechanics procedures as defined by standards, using three-dimensional stereo-metric mechanical behaviour measurement methods. Fracture behaviour of metallic materials, mainly 316L stainless steel and titanium alloy Ti-6Al-4V specimens, is analyzed by using a digital image correlation (DIC) system for measuring strain and displacement in the material. GOM three-dimensional optical system and Aramis software are used to perform experimental analysis of selected specimens. As this system is used to measure strain and crack tip opening displacement (CTOD) parameter on the modified compact tension specimen C(T) and notch specimens, a basic review of measuring procedures and result processing is given, alongside other possible applications for this system. The presented results show strain and displacement fields during crack tip opening, crack growth, and the moment of fracture of specimens, which are not possible using traditional measurement methods. The analysis of results shows that it is possible to measure displacements during crack tip opening with a great precision, and thus obtain the CTOD parameter. The results show that the selected measuring method obtains good results in the analysis of mechanical behaviour and fracture mechanics parameters of metallic materials
Differences in Energy Capacities between Tennis Players and Runners
The primary purpose of this study was to determine differences between elite athletes and tennis players in order to provide a clearer picture regarding the energy demands in modern tennis. Forty-eight (48) athletes and 24 tennis players from Croatian national leagues were compared in morphological and physiological parameters of an all-out incremental treadmill test with gas exchange measurements. Tennis playersā HRmax (192.96Ā±7.75 bpm) shows values that are most different to 400-meters sprinters (200.13Ā±6.95 bpm). Maximum running speed of tennis players on the treadmill (vmax) is no different with the speed achieved by sprinters, while there are significant differences among other athletes. Values in
running speed at anaerobic threshold (vAnT) show no statistically significant difference with the values for athlete sprinters and 400-m sprinters. Values of RvO2 max for tennis players indicate significant similarities with athlete sprinters and 400-m sprinters while the values of RvO2 AnT are nearly identical with the values for sprinters and show no statistically significant differences (p<0.05). The results indicate that values achieved by tennis players approximate most different those of the middle and long distance runners. This singles out the possible importance of the anaerobic capacity and the high level of sprint endurance in tennis players. Knowing these characteristics is the basis for planning and implementing training systems that will enable the increase and optimal usage of energy capacities of tennis players in possibly improving sports results
Comparative Exemination of the Strengthened and Non-Strengthened NIMONIC Specimens with Laser Shot Peening Method
Laser shot peening (LSP) of material strengthening is nowdays widely used method in various branches of industry. In this paper are presented comparative exeminations of specimen made of NIMONIC and strengthened specimen on which laser shot peening method was performed. Specimens were made as thin plates with holes. Macrostructural surface tests were performed around the specimens holes with different magnifications for both specimens as well as certain damages on the specimens. 3D images of specimens damages provide insights into the its dimensions. In addition, the roughness of non-strengthed and strengthed specimens was also performed. Hardness tests using the Rockwell C method of both specimens show a difference in the hardness of both samples and the main characteristics of the laser shot peening method. Also, the analysis on how the damage of samples could represent the location of initial cracks that could cause failure of the specimens or generally machine part is given as well
The Sustainability Analysis of Women-owned Businesses Examined Through the Impact of Selected Variables on Dimensions of Innovation Capacity
Innovation is often described as the main driving force of business, which can lead to the company's sustainable growth. Not all innovation dimensions are equally responsible for the sustainability of businesses. Therefore, this study examines the sustainability of women-owned businesses by exploring the influence of selected variables on specific dimensions of companies' innovation capacities. Based on the commonly applied methodologies for assessing the innovation capacity of companies such as IMPĀ³rove and Innovate, the following variables were chosen for the analysis of the impact on innovation in the context of the sustainability of SMEs: 1) annual income and its impact on the decision to invest in innovation 2) the sector of operation and its influence on expectations regarding growth 3) the expectations regarding growth and its impact to a range of innovation dimensions. Different techniques were used, starting with descriptive statistics, then Cross-tabulation, Pearson's chi-square test and ANOVA as the most appropriate techniques to conduct statistical analysis. The research has indicated that annual income does not have a decisive influence on the decision to invest in innovation, as does the sector. However, the sector of operations has a significant influence on expectations regarding growth. Also, there is a statistically significant difference between growth expectations and dimensions such as client base and product development plan, market awareness and perception, innovation strategy, decision-making process, employee training, business networking, and external advice. While exploring the innovation activity of launching new products/services, we came to a finding that is potentially risky for the sustainability of womenās businesses, namely that 50% of the companies in the sample offer only one product to one customer. That is why it is important that companies that have a high awareness of the need to innovate diversify their product and client portfolio and thus ensure greater independence on the market and, therefore, sustainability
Effect of laser shock peening with and without protective coating on the microstructure and mechanical properties of Ti-alloy
Owing to their good mechanical properties, titanium based alloys are used for machine parts and devices that operate in demanding regimes and environmental conditions. Laser shock peening (LSP) is an innovative technique for improvement of the surface and mechanical characteristics of the material. In this paper, LSP is employed for additional improvement of already good characteristics of Ti- alloy. Laser shock peening is performed on alloy surface, with and without protective and transparent layer and obtained microstructure, surface characteristics and mechanical properties are compared. LSP improved the surface topology and microhardness of material, producing overall better results when the Ti-alloy surface was coated by transparent and protective layer
Effect of laser shock peening with and without protective coating on the microstructure and mechanical properties of Ti-alloy
Owing to their good mechanical properties, titanium based alloys are used for machine parts and devices that operate in demanding regimes and environmental conditions. Laser shock peening (LSP) is an innovative technique for improvement of the surface and mechanical characteristics of the material. In this paper, LSP is employed for additional improvement of already good characteristics of Ti- alloy. Laser shock peening is performed on alloy surface, with and without protective and transparent layer and obtained microstructure, surface characteristics and mechanical properties are compared. LSP improved the surface topology and microhardness of material, producing overall better results when the Ti-alloy surface was coated by transparent and protective layer
DOI:10.2298/ABS1003775P NEW INVASIVE SPECIES OF APHIDS (HEMIPTERA, APHIDIDAE) IN SERBIA AND MONTENEGRO
Abstract-. Three new invasive species of aphids have been found in Serbia: Chaitophorus populifolli Essig, Myzocallis walshii (Monell) and Trichosiphonaphis polygonifoliae (Shinji) and two have been found in Montenegro: Aphis illinoisensis Shimer and Tinocallis kahawaluokalani (Kirkaldy). A. illinoisensis is a pest of the grapevine, T. polygonifoliae, feeds on a decorative shrub (Lonicera) and the other three feed on trees (Populus, Quercus and Lagerostroemia). ThrŠµŠµ of the species are American aphids and two are of Asian origin. Their morphology, illustrated by original drawings and data on the biology and distribution are given
New invasive species of aphids (Hemiptera, Aphididae) in Serbia and Montenegro
Three new invasive species of aphids have been found in Serbia: Chaitophorus populifolli Essig, Myzocallis walshii (Monell) and Trichosiphonaphis polygonifoliae (Shinji) and two have been found in Montenegro: Aphis illinoisensis Shimer and Tinocallis kahawaluokalani (Kirkaldy). A. illinoisensis is a pest of the grapevine, T. polygonifoliae, feeds on a decorative shrub (Lonicera) and the other three feed on trees (Populus, Quercus and Lagerostroemia). Three of the species are American aphids and two are of Asian origin. Their morphology, illustrated by original drawings and data on the biology and distribution are given.