This research investigates the influence of computer simulations (virtual experiments) on one han... more This research investigates the influence of computer simulations (virtual experiments) on one hand and real experiments on the other hand on the development of higher order skills, as well as the differences in those two approaches in the unit Electrical Charging. The sample, which was investigated, consists of students in the second year of a gymnasium in Macedonia. There were two experimental groups and one control group. In one of the experimental group, the instruction was realized by means of computer simulations. In the other experimental group the instruction was realized by means of real experiments. The obtained results from both of groups were compared with the results from the control group, where traditional instruction was used. The same teacher performed the instructions in all of groups. The pre-knowledge was tested with a pre test, as well as the acquired knowledge after the instructions. The same tests and analysis were performed with all three groups. The results r...
In this research, we investigate the advantages and disadvantages of using real and virtual exper... more In this research, we investigate the advantages and disadvantages of using real and virtual experiments in developing students' knowledge and skills. The investigation samples consist of 10th grade students of three gymnasiums in Macedonia. The students were divided into three groups: Real, Virtual and Traditional group. Real experiments were applied in the classes of the Real group, virtual experiments were applied in the classes of the Virtual group and traditional direct teaching was applied in the Traditional group. Students' task was to investigate how various ways of connecting electrical resistors influence the work of the electric circuit. The research shows that each of the approaches gives different contribution to the knowledge and understanding of the processes and concepts of teaching. Real experiments give contribution to the skills related to cooperation and teamwork, as well as better understanding of the phenomena. On the other hand, simulations give opportu...
This research investigates the influence of computer simulations (virtual experiments) on one han... more This research investigates the influence of computer simulations (virtual experiments) on one hand and real experiments on the other hand on the conceptual understanding of electrical charging. The investigated sample consists of students in the second year (10 th grade) of three gymnasiums in Macedonia. There were two experimental groups and one control group. In one of the experimental groups, called Sim group, the instruction was realized by means of computer simulations. In the other experimental group, called Real group, the instruction was realized by means of real experiments. The difference between pre-test results and post-test results revel that the approaches used in experimental groups give more quality knowledge and skills than the one in the control group. The results in the Real group and Sim group are very similar. There are slight differences caused by the different features of the two approaches. Some differences occur based on the feature difference between real e...
One important recent trend in deposition technology is the continuous expansion of available proc... more One important recent trend in deposition technology is the continuous expansion of available processes towards higher ion assistance with the subsequent beneficial effects to film properties. Nowadays, a multitude of processes, including vacuum arc deposition and plasma immersion ion implantation, are available.This work presents how the control of energetic ion bombardment leads to improved adhesion, reduced substrate temperatures, control of intrinsic stress within the films as well as adjustment of surface texture, phase formation and nanotopography.While a large amount of literature is available describing the different processes and methods, with a different set of literature detailing the film properties and applications, a short and concise overview of processes and feasible influences on film properties, including recent advances in nanotechnology, can seldom be found. Current overviews could be consulted on more specific details of selected aspects, e.g., for the microstruc...
Mechanical properties of materials with ultrafine grain (UFG) size have attracted considerable sc... more Mechanical properties of materials with ultrafine grain (UFG) size have attracted considerable scientific attention and technological interest during the last few years. It was well established that the grain size of metallic alloys may be substantially refined with a severe plastic deformation (SPD). The present work focuses on equal-channel angular pressing (ECAP) as the most used method of SPD for grain refinement inducing a significant enhancement to the mechanical and functional properties of the commercial AA5754. ECAP with up to 6 passes resulted in a substantial grain-size reduction from 70 μm of an as-received sample to 5 μm. The aforementioned reduction of the grain size increased the microhardness by a factor of 4. These results were compared to those of AA3004.
This paper contain the molecular absorption spectroscopic investigation on environmental pollutio... more This paper contain the molecular absorption spectroscopic investigation on environmental pollution by many pollutants. For this purpose a laser absorption spectroscopy at 630 nm wavelength have been applied to excited the molecular spectra in order to identify the presence of main gas pollutants. The following vas the experimental procedure. Preliminary the presence of pollutants was identified. The gas champions were taken in leave environ, in the Tetova streets where cars moved, and in some points in Tetova suburb, during different period of the day. A special civet, part of the apparatus, has been filled by environmental air, and latter, putted into the apparatus. A laser beam pulls pas throughout absorbing gas medium inter the civet to excite the gas, and the absorbing spectra were automatically registered. The molecular band spectra registration has been performed by an FT-IR Spectrometer (Spectrum BX FT-IR, Perkin Elmer). For this purpose the measurements were focused in spect...
Paper is based on the determination of the main air and environment pollutants in general such as... more Paper is based on the determination of the main air and environment pollutants in general such as CO2 (carbon dioxide), CO (carbon monoxide) and PM10 particles released from industrial facilities, vehicles, combustion and decomposition of dumped substances. Their impact is harmful to human health, plant and animal world. Today the world is increasingly alarmed about these risks, for human awareness of environmental protection. Physics and other sciences have given humanity the knowledge, techniques and the technology, with the application of which we extract large quantities of raw material such as minerals (fossil fuel, construction material), which are then processed to satisfy the needs of the population. But most often, the technologies used, do not take into account what is left behind the processing of raw materials and therefore industrial and other waste materials are created, which cannot be recycled in the natural exchange cycle, food chain, etc. As an illustration, accord...
Neset Izairi1, Fadil Ajredini1, Afërdita Veveçka-Priftaj2, Mimoza Ristova3 1Department of Physics... more Neset Izairi1, Fadil Ajredini1, Afërdita Veveçka-Priftaj2, Mimoza Ristova3 1Department of Physics, Faculty of Natural Sciences and Mathematics, State University of Tetovo, Tetovo, Republic of Macedonia 2Department of Physics, Polytechnic University of Tirana, Sheshi Nënë Tereza, N.4, Tirana, Albania 3Institute of Physics, Faculty of Natural Sciences and Mathematics, University Ss. Cyril and Methodius, Skopje, Republic of Macedonia neset.izairi@unite.edu.mk
This paper contain the molecular absorption spectroscopic investigation on environmental pollutio... more This paper contain the molecular absorption spectroscopic investigation on environmental pollution by many pollutants. For this purpose a laser absorption spectroscopy at 630 nm wavelength have been applied to excited the molecular spectra in order to identify the presence of main gas pollutants. The following vas the experimental procedure. Preliminary the presence of pollutants was identified. The gas champions were taken in leave environ, in the Tetova streets where cars moved, and in some points in Tetova suburb, during different period of the day. A special civet, part of the apparatus, has been filled by environmental air, and latter, putted into the apparatus. A laser beam pulls pas throughout absorbing gas medium inter the civet to excite the gas, and the absorbing spectra were automatically registered. The molecular band spectra registration has been performed by an FT-IR Spectrometer (Spectrum BX FT-IR, Perkin Elmer). For this purpose the measurements were focused in spect...
This research investigates the influence of computer simulations (virtual experiments) on one han... more This research investigates the influence of computer simulations (virtual experiments) on one hand and real experiments on the other hand on the development of higher order skills, as well as the differences in those two approaches in the unit Electrical Charging. The sample, which was investigated, consists of students in the second year of a gymnasium in Macedonia. There were two experimental groups and one control group. In one of the experimental group, the instruction was realized by means of computer simulations. In the other experimental group the instruction was realized by means of real experiments. The obtained results from both of groups were compared with the results from the control group, where traditional instruction was used. The same teacher performed the instructions in all of groups. The pre-knowledge was tested with a pre test, as well as the acquired knowledge after the instructions. The same tests and analysis were performed with all three groups. The results r...
In this research, we investigate the advantages and disadvantages of using real and virtual exper... more In this research, we investigate the advantages and disadvantages of using real and virtual experiments in developing students' knowledge and skills. The investigation samples consist of 10th grade students of three gymnasiums in Macedonia. The students were divided into three groups: Real, Virtual and Traditional group. Real experiments were applied in the classes of the Real group, virtual experiments were applied in the classes of the Virtual group and traditional direct teaching was applied in the Traditional group. Students' task was to investigate how various ways of connecting electrical resistors influence the work of the electric circuit. The research shows that each of the approaches gives different contribution to the knowledge and understanding of the processes and concepts of teaching. Real experiments give contribution to the skills related to cooperation and teamwork, as well as better understanding of the phenomena. On the other hand, simulations give opportu...
This research investigates the influence of computer simulations (virtual experiments) on one han... more This research investigates the influence of computer simulations (virtual experiments) on one hand and real experiments on the other hand on the conceptual understanding of electrical charging. The investigated sample consists of students in the second year (10 th grade) of three gymnasiums in Macedonia. There were two experimental groups and one control group. In one of the experimental groups, called Sim group, the instruction was realized by means of computer simulations. In the other experimental group, called Real group, the instruction was realized by means of real experiments. The difference between pre-test results and post-test results revel that the approaches used in experimental groups give more quality knowledge and skills than the one in the control group. The results in the Real group and Sim group are very similar. There are slight differences caused by the different features of the two approaches. Some differences occur based on the feature difference between real e...
One important recent trend in deposition technology is the continuous expansion of available proc... more One important recent trend in deposition technology is the continuous expansion of available processes towards higher ion assistance with the subsequent beneficial effects to film properties. Nowadays, a multitude of processes, including vacuum arc deposition and plasma immersion ion implantation, are available.This work presents how the control of energetic ion bombardment leads to improved adhesion, reduced substrate temperatures, control of intrinsic stress within the films as well as adjustment of surface texture, phase formation and nanotopography.While a large amount of literature is available describing the different processes and methods, with a different set of literature detailing the film properties and applications, a short and concise overview of processes and feasible influences on film properties, including recent advances in nanotechnology, can seldom be found. Current overviews could be consulted on more specific details of selected aspects, e.g., for the microstruc...
Mechanical properties of materials with ultrafine grain (UFG) size have attracted considerable sc... more Mechanical properties of materials with ultrafine grain (UFG) size have attracted considerable scientific attention and technological interest during the last few years. It was well established that the grain size of metallic alloys may be substantially refined with a severe plastic deformation (SPD). The present work focuses on equal-channel angular pressing (ECAP) as the most used method of SPD for grain refinement inducing a significant enhancement to the mechanical and functional properties of the commercial AA5754. ECAP with up to 6 passes resulted in a substantial grain-size reduction from 70 μm of an as-received sample to 5 μm. The aforementioned reduction of the grain size increased the microhardness by a factor of 4. These results were compared to those of AA3004.
This paper contain the molecular absorption spectroscopic investigation on environmental pollutio... more This paper contain the molecular absorption spectroscopic investigation on environmental pollution by many pollutants. For this purpose a laser absorption spectroscopy at 630 nm wavelength have been applied to excited the molecular spectra in order to identify the presence of main gas pollutants. The following vas the experimental procedure. Preliminary the presence of pollutants was identified. The gas champions were taken in leave environ, in the Tetova streets where cars moved, and in some points in Tetova suburb, during different period of the day. A special civet, part of the apparatus, has been filled by environmental air, and latter, putted into the apparatus. A laser beam pulls pas throughout absorbing gas medium inter the civet to excite the gas, and the absorbing spectra were automatically registered. The molecular band spectra registration has been performed by an FT-IR Spectrometer (Spectrum BX FT-IR, Perkin Elmer). For this purpose the measurements were focused in spect...
Paper is based on the determination of the main air and environment pollutants in general such as... more Paper is based on the determination of the main air and environment pollutants in general such as CO2 (carbon dioxide), CO (carbon monoxide) and PM10 particles released from industrial facilities, vehicles, combustion and decomposition of dumped substances. Their impact is harmful to human health, plant and animal world. Today the world is increasingly alarmed about these risks, for human awareness of environmental protection. Physics and other sciences have given humanity the knowledge, techniques and the technology, with the application of which we extract large quantities of raw material such as minerals (fossil fuel, construction material), which are then processed to satisfy the needs of the population. But most often, the technologies used, do not take into account what is left behind the processing of raw materials and therefore industrial and other waste materials are created, which cannot be recycled in the natural exchange cycle, food chain, etc. As an illustration, accord...
Neset Izairi1, Fadil Ajredini1, Afërdita Veveçka-Priftaj2, Mimoza Ristova3 1Department of Physics... more Neset Izairi1, Fadil Ajredini1, Afërdita Veveçka-Priftaj2, Mimoza Ristova3 1Department of Physics, Faculty of Natural Sciences and Mathematics, State University of Tetovo, Tetovo, Republic of Macedonia 2Department of Physics, Polytechnic University of Tirana, Sheshi Nënë Tereza, N.4, Tirana, Albania 3Institute of Physics, Faculty of Natural Sciences and Mathematics, University Ss. Cyril and Methodius, Skopje, Republic of Macedonia neset.izairi@unite.edu.mk
This paper contain the molecular absorption spectroscopic investigation on environmental pollutio... more This paper contain the molecular absorption spectroscopic investigation on environmental pollution by many pollutants. For this purpose a laser absorption spectroscopy at 630 nm wavelength have been applied to excited the molecular spectra in order to identify the presence of main gas pollutants. The following vas the experimental procedure. Preliminary the presence of pollutants was identified. The gas champions were taken in leave environ, in the Tetova streets where cars moved, and in some points in Tetova suburb, during different period of the day. A special civet, part of the apparatus, has been filled by environmental air, and latter, putted into the apparatus. A laser beam pulls pas throughout absorbing gas medium inter the civet to excite the gas, and the absorbing spectra were automatically registered. The molecular band spectra registration has been performed by an FT-IR Spectrometer (Spectrum BX FT-IR, Perkin Elmer). For this purpose the measurements were focused in spect...
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