What is nanoscience? What is nanotechnology? What is so special about nanoscale? These questions are only a few important to discuss, in order to understand the nanoworld. We describe nanoscience and nanotechnology introducing the basic ideas of the new technology that can significantly change our lives. Nanoworld is invisible to the naked eye, and with many unusual properties of material. It has been observed that nanoscale numerous properties such as melting point, electrical conductivity, or chemical reactivity, change as a function of the size of the sample, and many nanomaterials have been produced. Special attention in this paper is focused on the formation of self-assembled monolayers. This process is described as the creation of organic thin films of nanometer thickness and it is an emerging area of materials chemistry, utilized in many applications.
{"title":"INTRODUCTION TO NANOTECHNOLOGY AND MOLECULAR SELF-ASSEMBLY","authors":"J. Manojlovic","doi":"10.22190/FUACR1802105M","DOIUrl":"https://doi.org/10.22190/FUACR1802105M","url":null,"abstract":"What is nanoscience? What is nanotechnology? What is so special about nanoscale? These questions are only a few important to discuss, in order to understand the nanoworld. We describe nanoscience and nanotechnology introducing the basic ideas of the new technology that can significantly change our lives. Nanoworld is invisible to the naked eye, and with many unusual properties of material. It has been observed that nanoscale numerous properties such as melting point, electrical conductivity, or chemical reactivity, change as a function of the size of the sample, and many nanomaterials have been produced. Special attention in this paper is focused on the formation of self-assembled monolayers. This process is described as the creation of organic thin films of nanometer thickness and it is an emerging area of materials chemistry, utilized in many applications.","PeriodicalId":93645,"journal":{"name":"Facta universitatis. Series, Mechanics, automatic control and robotics","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74080327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Udhayakumar, R. Sindhu, R. Srivasthan, Y. Yogaraj
The harvesting of solar energy is gaining increasing attention as it is pollution free and is available in abundance. Various researches and experiments are being carried out to improve the efficiency of power conversion by altering the material of the photovoltaic panels, by incorporating tracking systems and by making use of Maximum Power Point Tracking (MPPT) algorithms. The conventional rigidly fixed solar panels limit their area of exposure to the sun during the entire day. The use of tracker increases the area of panel exposed to direct beam of the sun, thus increasing the power generated. MPPT algorithm tracks the maximum power point attained at all loads and extracts the power from the panel at that voltage. Despite the variations in the external environment, the power obtained from the panel is always maximum. This paper reviews various tracking methods and MPPT techniques to increase the energy harvesting capacity of the panel and in turn improve its efficiency.
{"title":"IMPROVING THE EFFICIENCY OF A PHOTOVOLTAIC SYSTEM BY INCORPORATING TRACKING SYSTEM AND MPPT: A REVIEW","authors":"S. Udhayakumar, R. Sindhu, R. Srivasthan, Y. Yogaraj","doi":"10.22190/FUACR1801057U","DOIUrl":"https://doi.org/10.22190/FUACR1801057U","url":null,"abstract":"The harvesting of solar energy is gaining increasing attention as it is pollution free and is available in abundance. Various researches and experiments are being carried out to improve the efficiency of power conversion by altering the material of the photovoltaic panels, by incorporating tracking systems and by making use of Maximum Power Point Tracking (MPPT) algorithms. The conventional rigidly fixed solar panels limit their area of exposure to the sun during the entire day. The use of tracker increases the area of panel exposed to direct beam of the sun, thus increasing the power generated. MPPT algorithm tracks the maximum power point attained at all loads and extracts the power from the panel at that voltage. Despite the variations in the external environment, the power obtained from the panel is always maximum. This paper reviews various tracking methods and MPPT techniques to increase the energy harvesting capacity of the panel and in turn improve its efficiency.","PeriodicalId":93645,"journal":{"name":"Facta universitatis. Series, Mechanics, automatic control and robotics","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82253782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A comprehensive analysis of realization of digital filters with complex coefficients obtained by decomposition of real digital filters, using complex and real allpass networks, is given in the paper. Realization of complex coefficient filters obtained directly in the z domain is also discussed in the paper. An analysis of hardware costs for different structures used for realization of complex coefficient filters is presented.
{"title":"REALIZATION OF DIGITAL FILTERS WITH COMPLEX COEFFICIENTS","authors":"S. Nikolic, G. Stancic, Stevica Cvetkovic","doi":"10.22190/FUACR1801025N","DOIUrl":"https://doi.org/10.22190/FUACR1801025N","url":null,"abstract":"A comprehensive analysis of realization of digital filters with complex coefficients obtained by decomposition of real digital filters, using complex and real allpass networks, is given in the paper. Realization of complex coefficient filters obtained directly in the z domain is also discussed in the paper. An analysis of hardware costs for different structures used for realization of complex coefficient filters is presented.","PeriodicalId":93645,"journal":{"name":"Facta universitatis. Series, Mechanics, automatic control and robotics","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91110619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The heart of a modern and efficient information system is a computer database that can be accessed from all over the world. The system demands a strong protection and cryptography, due to a large number of threats in the electronic era. In the well organized transplant programs, all transplantation centers have access to the central computer database. In this important database, the transplantation centers enter information of their recipients along with the recipient profile and the donor profile. This is the basic principle of making the best match between donated organ and recipient. This paper elaborates the SetNet information system with potential criminal activities and malpractice regarding central computer database.
{"title":"SECURE ORGAN TRANSPLANT INFORMATION SYSTEM","authors":"V. Borović, S. Borović, Vida Drasute, D. Rancic","doi":"10.22190/FUACR1801001B","DOIUrl":"https://doi.org/10.22190/FUACR1801001B","url":null,"abstract":"The heart of a modern and efficient information system is a computer database that can be accessed from all over the world. The system demands a strong protection and cryptography, due to a large number of threats in the electronic era. In the well organized transplant programs, all transplantation centers have access to the central computer database. In this important database, the transplantation centers enter information of their recipients along with the recipient profile and the donor profile. This is the basic principle of making the best match between donated organ and recipient. This paper elaborates the SetNet information system with potential criminal activities and malpractice regarding central computer database.","PeriodicalId":93645,"journal":{"name":"Facta universitatis. Series, Mechanics, automatic control and robotics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87366826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The aim of this paper is to design, analyze and compare four different systems for ADC (analog-to-digital conversion) of vibration signals. Measurement of vibration signals is of particular importance in many areas, such as predictive maintenance or structural health monitoring. Wireless systems for vibration measurements becomes very topical, due to much easier and cheaper installation compared to wired systems. Due to the lack of transmission bandwidth and energy in wireless measurement systems, the amount of digital data being sent has to be reduced; hence, we have to apply ADC systems that can achieve the required digital signal quality, reducing the bit-rate. Four ADC systems are analyzed, for possible application in wireless measurement systems: PCM (pulse code modulation) based on uniform quantization; DPCM (differential PCM) to exploit high correlation of vibration signals; two adaptive ADC systems to cope with significant variations of characteristics of vibration signals in time - APCM (adaptive PCM) with adaptation on variance and ADPCM (adaptive DPCM), with double adaptation (both on variance and correlation). These ADC models are designed and optimized specifically for vibration signals, based on the analysis of 20 vibration signals from a referent database. An experiment is done, applying designed ADC systems for digitalization of vibration signals. APCM, DPCM and ADPCM systems allow significant bit-rate reduction compared to the PCM system, but with the increasing of complexity, hence the compromise between the bit-rate reduction and complexity is needed.
{"title":"DESIGN AND ANALYSIS OF DIFFERENT TECHNIQUES FOR ANALOG-TO-DIGITAL CONVERSION OF VIBRATION SIGNALS FOR WIRELESS MEASUREMENT SYSTEMS","authors":"M. Dincic, D. Denic, Z. Perić","doi":"10.22190/FUACR1801039D","DOIUrl":"https://doi.org/10.22190/FUACR1801039D","url":null,"abstract":"The aim of this paper is to design, analyze and compare four different systems for ADC (analog-to-digital conversion) of vibration signals. Measurement of vibration signals is of particular importance in many areas, such as predictive maintenance or structural health monitoring. Wireless systems for vibration measurements becomes very topical, due to much easier and cheaper installation compared to wired systems. Due to the lack of transmission bandwidth and energy in wireless measurement systems, the amount of digital data being sent has to be reduced; hence, we have to apply ADC systems that can achieve the required digital signal quality, reducing the bit-rate. Four ADC systems are analyzed, for possible application in wireless measurement systems: PCM (pulse code modulation) based on uniform quantization; DPCM (differential PCM) to exploit high correlation of vibration signals; two adaptive ADC systems to cope with significant variations of characteristics of vibration signals in time - APCM (adaptive PCM) with adaptation on variance and ADPCM (adaptive DPCM), with double adaptation (both on variance and correlation). These ADC models are designed and optimized specifically for vibration signals, based on the analysis of 20 vibration signals from a referent database. An experiment is done, applying designed ADC systems for digitalization of vibration signals. APCM, DPCM and ADPCM systems allow significant bit-rate reduction compared to the PCM system, but with the increasing of complexity, hence the compromise between the bit-rate reduction and complexity is needed.","PeriodicalId":93645,"journal":{"name":"Facta universitatis. Series, Mechanics, automatic control and robotics","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84689646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Valentina Nejkovic, N. Milosevic, F. Jelenkovic, Z. Nikolic, M. Tosic
A rapid growth of the wireless communications and heavily occupied spectrum lead to an inevitable interference between the heterogenous systems operating in the same frequency band. Having in mind the development of the Internet of Things (IoT) services and networks and widely present WiFi networks on the one hand, and the fact that these two systems occupy the same 2.4 GHz frequency band on the other hand, it is clear that the control of the interference and the spectrum coordination are of the highest importance. The first step in the interference control is to acquire its properties. Since the simulation of a large IoT network is not entirely possible, due to the numerous factors not known in advance, the interference assessment is performed on the SmartSantander, an IoT testbed, located in Santander, Spain. This paper presents a statistical analysis of the sensor data and describes the interference properties and its influence. These results may be used for the spectrum coordination, together with the neural networks and semantic technologies.
{"title":"DATA MINING FOR INTERFERENCE AVOIDANCE IN SMART CITIES IOT NETWORKS","authors":"Valentina Nejkovic, N. Milosevic, F. Jelenkovic, Z. Nikolic, M. Tosic","doi":"10.22190/FUACR1801013N","DOIUrl":"https://doi.org/10.22190/FUACR1801013N","url":null,"abstract":"A rapid growth of the wireless communications and heavily occupied spectrum lead to an inevitable interference between the heterogenous systems operating in the same frequency band. Having in mind the development of the Internet of Things (IoT) services and networks and widely present WiFi networks on the one hand, and the fact that these two systems occupy the same 2.4 GHz frequency band on the other hand, it is clear that the control of the interference and the spectrum coordination are of the highest importance. The first step in the interference control is to acquire its properties. Since the simulation of a large IoT network is not entirely possible, due to the numerous factors not known in advance, the interference assessment is performed on the SmartSantander, an IoT testbed, located in Santander, Spain. This paper presents a statistical analysis of the sensor data and describes the interference properties and its influence. These results may be used for the spectrum coordination, together with the neural networks and semantic technologies.","PeriodicalId":93645,"journal":{"name":"Facta universitatis. Series, Mechanics, automatic control and robotics","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72987911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The exploitation of the properties at the nanoscale enables novel nanorobotic-based instrumented platforms and techniques. Here, some unique interdisciplinary examples from our research laboratory are briefly described providing some insights about the possibilities and the huge potentials of nanorobotics with main areas of applications in medicine and bioengineering, including supporting new robotic platforms for micro- and nano-manufacturing and high-throughput automatic operations at the nanoscale. For several applications where specifications cannot be met using modern technologies, especially at such small scales, a highly interdisciplinary approach integrating biological components in engineered systems becomes an essential part of the development process.
{"title":"NANOROBOTS FOR MICROFACTORIES TO OPERATIONS IN THE HUMAN BODY AND ROBOTS PROPELLED BY BACTERIA.","authors":"Sylvain Martel","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The exploitation of the properties at the nanoscale enables novel nanorobotic-based instrumented platforms and techniques. Here, some unique interdisciplinary examples from our research laboratory are briefly described providing some insights about the possibilities and the huge potentials of nanorobotics with main areas of applications in medicine and bioengineering, including supporting new robotic platforms for micro- and nano-manufacturing and high-throughput automatic operations at the nanoscale. For several applications where specifications cannot be met using modern technologies, especially at such small scales, a highly interdisciplinary approach integrating biological components in engineered systems becomes an essential part of the development process.</p>","PeriodicalId":93645,"journal":{"name":"Facta universitatis. Series, Mechanics, automatic control and robotics","volume":"7 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2939730/pdf/nihms148996.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40078934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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