Pub Date : 2019-09-01DOI: 10.1109/CAOL46282.2019.9019574
V. Kotlyar, S. Stafeev, A. Kovalev
We obtain a set of explicit analytical expressions that completely describe a light field with a double higher-order singularity (phase and polarization), as well as distributions of its intensity and energy flux near the focus.There is a reverse energy flux on the optical axis near the focus, which is comparable in magnitude with the forward flux. There is a toroidal energy flux in the focal area near the dark rings in the distribution of the longitudinal component of the Poynting vector.
{"title":"Toroidal and reverse flux of light in the sharp focus","authors":"V. Kotlyar, S. Stafeev, A. Kovalev","doi":"10.1109/CAOL46282.2019.9019574","DOIUrl":"https://doi.org/10.1109/CAOL46282.2019.9019574","url":null,"abstract":"We obtain a set of explicit analytical expressions that completely describe a light field with a double higher-order singularity (phase and polarization), as well as distributions of its intensity and energy flux near the focus.There is a reverse energy flux on the optical axis near the focus, which is comparable in magnitude with the forward flux. There is a toroidal energy flux in the focal area near the dark rings in the distribution of the longitudinal component of the Poynting vector.","PeriodicalId":308704,"journal":{"name":"2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL)","volume":"89 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116303392","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}
Pub Date : 2019-09-01DOI: 10.1109/CAOL46282.2019.9019540
Y. Ivanova, E. Klimova, I. Krivoruchko, A. Korobov, Prasol V.A., K.V. Myasoedov
Trophic ulcers are the most difficult and most frequent complication of chronic venous insufficiency of the adult able-bodied population, and is approximately 2%. The study purpose - improvement of the treatment results in patients with chronic venous insufficiency with trophic ulcers due to the use of artificial wound dressings and platelet-rich growth factors and phototherapy. The application of a complex of treatment of trophic ulcers in patients with chronic venous insufficiency, consisting of phototherapy, foamforming of incompetent perforator veins under ultrasound navigation and wound closure with synthetic plaque with a platelet growth factor, is an extremely effective stimulator of development of granulation tissue and spontaneous epithelization of the wound. Promising directions of development of this method of treatment are the studies of cellular mechanisms of regeneration and histological study of the stages of the development of connective tissue under the influence of phototherapy, platelet growth factor and the study of the possibility of using a combination of synthetic coverings and platelet growth factor with vacuum therapy.
{"title":"Phototherapy and Synthetic Wound Dressings in the Treatment of Trophic Ulcers of Venous Etiology","authors":"Y. Ivanova, E. Klimova, I. Krivoruchko, A. Korobov, Prasol V.A., K.V. Myasoedov","doi":"10.1109/CAOL46282.2019.9019540","DOIUrl":"https://doi.org/10.1109/CAOL46282.2019.9019540","url":null,"abstract":"Trophic ulcers are the most difficult and most frequent complication of chronic venous insufficiency of the adult able-bodied population, and is approximately 2%. The study purpose - improvement of the treatment results in patients with chronic venous insufficiency with trophic ulcers due to the use of artificial wound dressings and platelet-rich growth factors and phototherapy. The application of a complex of treatment of trophic ulcers in patients with chronic venous insufficiency, consisting of phototherapy, foamforming of incompetent perforator veins under ultrasound navigation and wound closure with synthetic plaque with a platelet growth factor, is an extremely effective stimulator of development of granulation tissue and spontaneous epithelization of the wound. Promising directions of development of this method of treatment are the studies of cellular mechanisms of regeneration and histological study of the stages of the development of connective tissue under the influence of phototherapy, platelet growth factor and the study of the possibility of using a combination of synthetic coverings and platelet growth factor with vacuum therapy.","PeriodicalId":308704,"journal":{"name":"2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131389044","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}
Pub Date : 2019-09-01DOI: 10.1109/CAOL46282.2019.9019569
D. Diakov, H. Nikolova, V. Vassilev
This report presents studies of the effectiveness of the system for compensating the influence of the laser beam instability on a two-channel laser measuring system for the evaluation of geometric parameters of flat surfaces.
本文研究了该系统补偿激光束不稳定性对平面几何参数评价双通道激光测量系统的影响的有效性。
{"title":"Laser measurement system with the laser beam instability compensation","authors":"D. Diakov, H. Nikolova, V. Vassilev","doi":"10.1109/CAOL46282.2019.9019569","DOIUrl":"https://doi.org/10.1109/CAOL46282.2019.9019569","url":null,"abstract":"This report presents studies of the effectiveness of the system for compensating the influence of the laser beam instability on a two-channel laser measuring system for the evaluation of geometric parameters of flat surfaces.","PeriodicalId":308704,"journal":{"name":"2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133654685","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}
Pub Date : 2019-09-01DOI: 10.1109/CAOL46282.2019.9019413
Y. Zholudov, A. Kukoba, L. Sajti, B. Chichkov
The work describes application of semiconductor quantum dots (QDs) in electrochemiluminescent assay of amine compounds and development of new method for production of shell-free semiconductor nanoparticles using laser fragmentation technique. Two basic strategies of electroanalytical application of QDs are presented. One is based on electrode modification with polymer films containing CdSe QDs that directly participate in ECL reaction with amine coreactants. The other is based on sensitization of ECL emission from fluorescent amino acids with CdSe QDs. We have also described efficient top-down method of fluorescent CdSe nanoparticles synthesis using laser fragmentation of its powder suspension in dimethylformamide, optical properties of produced QDs and discussed the applicability of produced nanoparticles for electroanalytical techniques.
{"title":"Generation of Fluorescent Nanoparticles by Laser Fragmentation Technique for Electrochemiluminescent Assay","authors":"Y. Zholudov, A. Kukoba, L. Sajti, B. Chichkov","doi":"10.1109/CAOL46282.2019.9019413","DOIUrl":"https://doi.org/10.1109/CAOL46282.2019.9019413","url":null,"abstract":"The work describes application of semiconductor quantum dots (QDs) in electrochemiluminescent assay of amine compounds and development of new method for production of shell-free semiconductor nanoparticles using laser fragmentation technique. Two basic strategies of electroanalytical application of QDs are presented. One is based on electrode modification with polymer films containing CdSe QDs that directly participate in ECL reaction with amine coreactants. The other is based on sensitization of ECL emission from fluorescent amino acids with CdSe QDs. We have also described efficient top-down method of fluorescent CdSe nanoparticles synthesis using laser fragmentation of its powder suspension in dimethylformamide, optical properties of produced QDs and discussed the applicability of produced nanoparticles for electroanalytical techniques.","PeriodicalId":308704,"journal":{"name":"2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131661995","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}
Pub Date : 2019-09-01DOI: 10.1109/CAOL46282.2019.9019515
O. Zaporozhets, N. Shtefan
A method for correcting the transformation function of a semiconductor thermistor using a nonlinearity compensator based on a three-layer perceptron is proposed. Using of computer simulation, the operability of the proposed method has been investigated, a comparative analysis has been carried out with polynomial compensators of nonlinearity.
{"title":"Using Artificial Neural Network for Compensation of Semiconductor Thermistor Nonlinearity","authors":"O. Zaporozhets, N. Shtefan","doi":"10.1109/CAOL46282.2019.9019515","DOIUrl":"https://doi.org/10.1109/CAOL46282.2019.9019515","url":null,"abstract":"A method for correcting the transformation function of a semiconductor thermistor using a nonlinearity compensator based on a three-layer perceptron is proposed. Using of computer simulation, the operability of the proposed method has been investigated, a comparative analysis has been carried out with polynomial compensators of nonlinearity.","PeriodicalId":308704,"journal":{"name":"2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115684773","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}
Pub Date : 2019-09-01DOI: 10.1109/CAOL46282.2019.9019559
A. Derzhypolskyi, L. Derzhypolska, O. Gnatovskyi
In the paper demonstrated is the tuning effect of fine alignment on the mode of output in self-associative Fourier holography scheme. Theoretical analysis is provided. Revealed is that observed effect is defined by input image structure, namely by Fourier trasform of image intensity. Developed is the method of controlled tuning of the system to achieve the selection of the output mode between phantom-like and fully associative data retrieval.
{"title":"Tunable associative readout in self-associative Fourier holography scheme by means of fine alignment","authors":"A. Derzhypolskyi, L. Derzhypolska, O. Gnatovskyi","doi":"10.1109/CAOL46282.2019.9019559","DOIUrl":"https://doi.org/10.1109/CAOL46282.2019.9019559","url":null,"abstract":"In the paper demonstrated is the tuning effect of fine alignment on the mode of output in self-associative Fourier holography scheme. Theoretical analysis is provided. Revealed is that observed effect is defined by input image structure, namely by Fourier trasform of image intensity. Developed is the method of controlled tuning of the system to achieve the selection of the output mode between phantom-like and fully associative data retrieval.","PeriodicalId":308704,"journal":{"name":"2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117266472","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}
Pub Date : 2019-09-01DOI: 10.1109/CAOL46282.2019.9019579
F. Mirzade, R. Islamov
A thermodynamically consistent phase field model accounting for coupled effects of large strains, heat diffusion and atomic defect (vacancy and interstitial atom) generation at moving liquid-solid interface is presented to describe microstructure development during laser powder-bed fusion additive manufacturing (AM) of metals. Our model equations, including the Ginsburg-Landau equation for the phase field with stress terms, diffusion-drift Cahn–Hilliard equation, describing atomic defect dynamics, an energy balance equation for the temperature change, and finally the elasticity equation for the displacement fields are derived under a thermodynamic frame based on entropy generation. To describe the effects of temperature gradient and fluid velocity distributions and thermal history on the defect dynamics during microstructure formation a linking of microscale model with the macroscopic AM processing conditions is discussed. Then isothermal equilibrium situation is considered to study diffusion-flexural instability due to defect-strain positive feedback in nanolayers with surface elasticity effects. The influence of defect clustering due to this instability on the periodic exfoliation of deposited layers on a substrate is also discussed.
{"title":"A phase field formulation of the coupled effects of defect generation and large strains on microstructure evolution during laser-based additive manufacturing","authors":"F. Mirzade, R. Islamov","doi":"10.1109/CAOL46282.2019.9019579","DOIUrl":"https://doi.org/10.1109/CAOL46282.2019.9019579","url":null,"abstract":"A thermodynamically consistent phase field model accounting for coupled effects of large strains, heat diffusion and atomic defect (vacancy and interstitial atom) generation at moving liquid-solid interface is presented to describe microstructure development during laser powder-bed fusion additive manufacturing (AM) of metals. Our model equations, including the Ginsburg-Landau equation for the phase field with stress terms, diffusion-drift Cahn–Hilliard equation, describing atomic defect dynamics, an energy balance equation for the temperature change, and finally the elasticity equation for the displacement fields are derived under a thermodynamic frame based on entropy generation. To describe the effects of temperature gradient and fluid velocity distributions and thermal history on the defect dynamics during microstructure formation a linking of microscale model with the macroscopic AM processing conditions is discussed. Then isothermal equilibrium situation is considered to study diffusion-flexural instability due to defect-strain positive feedback in nanolayers with surface elasticity effects. The influence of defect clustering due to this instability on the periodic exfoliation of deposited layers on a substrate is also discussed.","PeriodicalId":308704,"journal":{"name":"2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116362804","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}
Pub Date : 2019-09-01DOI: 10.1109/CAOL46282.2019.9019538
L. Kalandadze, O. Nakashidze, N. Gomidze, I. Jabnidze
It is well-known that the physical properties of already explored materials change in the process of their transformation into nanocrystals. The investigation of the reciprocal influence of the microstructure and the composition on the physical properties of nano-dispersive medium had become the goal of intensive exploration. In the given paper, using the nano Ni films nano-dispersive medium we consider theoretically and experimentally the impact of the structural parameters on the optical properties of the nanodispersive structures. In this work the optical properties of nano-dispersive structures are represented within the theoretical Maxwell-Garnett model. The behavior of the optical frequency dependences of nano Ni films was interpreted in the framework of the effective medium approximation in two cases: q<0.5 and 0.5< q<1 where q is the occupancy of the space of the nano-dispersive medium with particles. In this approach an effective refractive index (n+ik) of the nano structures can be calculated as a function of the properties of the matrix εm, q, and particle shapes. These calculations demonstrated a good accordance between the theoretical and the experimental results.
{"title":"Theoretical and Experimental Investigation of the Optical Properties of Nano nickel Films","authors":"L. Kalandadze, O. Nakashidze, N. Gomidze, I. Jabnidze","doi":"10.1109/CAOL46282.2019.9019538","DOIUrl":"https://doi.org/10.1109/CAOL46282.2019.9019538","url":null,"abstract":"It is well-known that the physical properties of already explored materials change in the process of their transformation into nanocrystals. The investigation of the reciprocal influence of the microstructure and the composition on the physical properties of nano-dispersive medium had become the goal of intensive exploration. In the given paper, using the nano Ni films nano-dispersive medium we consider theoretically and experimentally the impact of the structural parameters on the optical properties of the nanodispersive structures. In this work the optical properties of nano-dispersive structures are represented within the theoretical Maxwell-Garnett model. The behavior of the optical frequency dependences of nano Ni films was interpreted in the framework of the effective medium approximation in two cases: q<0.5 and 0.5< q<1 where q is the occupancy of the space of the nano-dispersive medium with particles. In this approach an effective refractive index (n+ik) of the nano structures can be calculated as a function of the properties of the matrix εm, q, and particle shapes. These calculations demonstrated a good accordance between the theoretical and the experimental results.","PeriodicalId":308704,"journal":{"name":"2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128386980","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}
Pub Date : 2019-09-01DOI: 10.1109/CAOL46282.2019.9019447
I. Fedorin, S. Gryshchenko
In the current paper the features of the wave surface of a semiconductor-dielectric periodic structure being under an action of an external magnetic field in the Voight geometry are studied. The periodic structure is considered in the long-wave limit when it can be modeled as an optically biaxial crystal with effective components of permittivity. The influence of dissipations in the semiconductor layers is numerically evaluated. The influence of the constituent materials parameters, of semiconductor and dielectric layers, filling factors and external magnetic field magnitude on the dispersion wave surface is studied numerically.
{"title":"Peculiarities of Wave Surface of a SemiconductorDielectric Metamaterial","authors":"I. Fedorin, S. Gryshchenko","doi":"10.1109/CAOL46282.2019.9019447","DOIUrl":"https://doi.org/10.1109/CAOL46282.2019.9019447","url":null,"abstract":"In the current paper the features of the wave surface of a semiconductor-dielectric periodic structure being under an action of an external magnetic field in the Voight geometry are studied. The periodic structure is considered in the long-wave limit when it can be modeled as an optically biaxial crystal with effective components of permittivity. The influence of dissipations in the semiconductor layers is numerically evaluated. The influence of the constituent materials parameters, of semiconductor and dielectric layers, filling factors and external magnetic field magnitude on the dispersion wave surface is studied numerically.","PeriodicalId":308704,"journal":{"name":"2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127540641","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}
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