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[IEEE 2018 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) - Vladivostok, Russia (2018.10.3-2018.10.4)] 2018 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) - Quality Control of Sodium High-Pressure Lamps by the Singular Decomposition Method
摘要： We created a mathematical model of a sodium high-pressure lamp. This model is used in production before sending lamps to the consumer. To develop the model, we used a mathematical model. An analytical method was used to describe the operation of a sodium lamp based on differential equations. We also used the singular value decomposition algorithm to find the coefficients of the ARMA model. Also, the transfer function of the ARMA model was obtained. Then we tested the models to control the quality of sodium lamps in production. The obtained results of the simulation coincide with the experimental results. A graphical dependence is obtained in the case when the standard deviation is 1. Using a series of tests based on the singular value decomposition method, we confirmed the adequacy of elaborated model by Kolmogorov-Smirnov criterion.
关键词： experimental research,mathematical model,sodium lamp
更新于2025-09-23 15:23:52
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[IEEE 2018 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) - Vladivostok, Russia (2018.10.3-2018.10.4)] 2018 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) - Modeling of the Magneto-Optical Channel of a Fiber-Optic Displacement Sensor
摘要： According to earlier studies conducted by the authors it was found that contactless fiber-optic sensors based on the magneto-optical Faraday effect (FOSF) in epitaxial films of iron garnet can be used for contactless monitoring of the status of control plate valves that regulate the flow of fire and explosion hazardous substances and operate over a wide temperature range. FOSF makes it possible to control the displacement and tilt angle of the valve regulating element (valve plate). However, at the moment there are no sufficiently accurate mathematical models for such FOSF. Studies have shown that the discrepancy between simulation results and experiments can reach 105%. The discrepancy between the results increases significantly when the FOSF is operated in a wide temperature range (from minus 196 to +80 °C). The low accuracy of the FOSF models does not make it possible to develop efficient means of compensating its intrinsic and complementary errors. The existing FOSF models are not sufficiently accurate, since they do not take into account: the distribution of the normal component of the magnetic field strength along the magneto-optical element (MOE) cross-section; the distribution of the optical radiation intensity along the MOE cross-section; optical absorption of the FOSF optical elements. According to the results of research carried out by the authors a set of mathematical models that takes into account the nonuniform distribution of the optical radiation intensity along the MOE cross-section, the nonuniform distribution of normal component of the magnetic field strength along the MOE cross-section, the optical absorption in FOSF optical elements and their temperature dependences was developed. This allowed us to significantly reduce the modelling error. The discrepancy between the results of mathematical modeling and experimental studies of FOSF prototypes does not exceed 7.2%.
关键词： control valve,contactless fiber optic sensor,mathematical model,fire and explosion safety,Faraday effect
更新于2025-09-23 15:23:52
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Evaluating impact damage to fabric-based personal armor by infrared NDT
摘要： The paper considers the thermo-mechanical mechanism of interaction between the damage agents and armor protection made of polymer fabrics. A simplified mathematical model is proposed to describe the deceleration of a damage agent within an armor fabric due to the dissipation of energy expended on irreversible stretching deformations of fabric fibers, as well as fiber slipping friction and material heating. Woven fabric layers are replaced by solid layers characterized by averaged stiffness and viscosity. A discrete numerical model of a solid material is proposed to reduce a problem with a finite number of degrees of freedom; motion equations are obtained on the basis of the Lagrange equations of the second kind, and for their integration, a stable non-conservative difference scheme is used. The software implementation is based on a functional-object paradigm which allows the modeling of conjugated processes. The parameters of governing equations are identified by using the experimental data. Some illustrative examples of interaction between damage agents and armor barriers with different arrangement of fibers are presented. The proposed model can be used to predict the quality of armor protection with the changing number and location of fibers, as well as to test the armor protection by applying the technique of infrared thermography.
关键词： Armor protection,mathematical model,irreversible deformation,infrared thermography,energy absorption,numerical scheme,composite material,fiber friction
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE 5G World Forum (5GWF) - Silicon Valley, CA, USA (2018.7.9-2018.7.11)] 2018 IEEE 5G World Forum (5GWF) - A Hexagonal Grid Based Human Blockage Model for the 5G Low Terahertz Band Communications
摘要： Users continuously demand higher connection speeds and data traffic from wireless communication networks. The newly required network capacity should be provided by higher frequency bands, because legacy sub-6 GHz bands are already operating using advanced communication techniques that provide very high spectral efficiencies. Consequently, millimeter wave communication standards are either complete or ongoing, and general submillimeter wave applications are next in line. Accordingly, this paper proposes a motion model in hexagonal grid of a person carrying a user equipment. Electromagnetic wave blockage analyses by utilizing channel characteristics of the low-THz band are presented. Lastly, the communication and blockage probabilities of an exemplary system are both theoretically examined and numerically simulated.
关键词： Markov processes,submillimeter wave propagation,numerical simulation,mathematical model,submillimeter wave communication,5G mobile communication
更新于2025-09-23 15:21:01
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Application of Response Surface Methodology to Evaluate Photodynamic Inactivation Mediated by Eosin Y and 530 nm LED against Staphylococcus aureus
摘要： Photodynamic antimicrobial chemotherapy (PAC) is an efficient tool for inactivating microorganisms. This technique is a good approach to inactivate the foodborne microorganisms, which are responsible for one of the major public health concerns worldwide—the foodborne diseases. In this work, response surface methodology (RSM) was used to evaluate the interaction of Eosin Y (EOS) concentration and irradiation time on Staphylococcus aureus counts and a sequence of designed experiments to model the combined effect of each factor on the response. A second-order polynomial empirical model was developed to describe the relationship between EOS concentration and irradiation time. The results showed that the derived model could predict the combined influences of these factors on S. aureus counts. The agreement between predictions and experimental observations (R2 adj = 0.9159, p = 0.000034) was also observed. The significant terms in the model were the linear negative effect of photosensitizer (PS) concentration, followed by the linear negative effect of irradiation time, and the quadratic negative effect of PS concentration. The highest reductions in S. aureus counts were observed when applying a light dose of 9.98 J/cm2 (498 nM of EOS and 10 min. irradiation). The ability of the evaluated model to predict the photoinactivation of S. aureus was successfully validated. Therefore, the use of RSM combined with PAC is a promising approach to inactivate foodborne pathogens.
关键词： photodynamic inactivation,xanthene dye,foodborne pathogen,green LED light,mathematical model
更新于2025-09-23 15:19:57
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Mathematical model development and optimal design of the horizontal all-glass evacuated tube solar collectors integrated with bottom mirror reflectors for solar energy harvesting
摘要： As one of the inexhaustible energy sources, solar energy as a means to provide space heating has been a public interest for decades. Many stand-alone solar thermal technologies have come into practice to replace the out-of-date systems. However, conventional solar thermal systems present two drawbacks: (1) unsteady solar sources can lead to insufficient heating in the winter, and (2) the solar collectors can become overheated in the summer. Therefore, this study proposes a conceptual design of an integrated solar harvesting unit that consists of the horizontal all-glass evacuated tube solar collectors and bottom mirror reflectors to overcome the above drawbacks to the largest extent possible. To accomplish this, a generic mathematical model of this design unit was developed, followed by the model validation process and optimal design analysis. For cities in the severe cold and cold climate zones of northern China, the bottom mirror reflectors can be regarded as solar energy collection boosters during the heating season, which can contribute solar energy ranging from 40% to 80% of the total collected solar energy depending on the inclined angles of the solar collectors and reflectors. In the summer, using such integrated unit with the solar collectors tilted at an obtuse angle, the absorbed solar radiation can be reduced by 20%, which is beneficial to overheating prevention.
关键词： Horizontal evacuated tube solar collector,Mathematical model,Optimal design,Bottom mirror reflector,Model validation
更新于2025-09-19 17:15:36
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Melatonin suppression is exquisitely sensitive to light and primarily driven by melanopsin in humans
摘要： Introduction: Light elicits a range of non-visual responses in humans. Driven predominantly by intrinsically photosensitive retinal ganglion cells (ipRGCs), but also by rods and/or cones, these responses include melatonin suppression. A sigmoidal relationship has been established between melatonin suppression and light intensity, however photoreceptoral involvement remains unclear. Methods and Results: In this study, we first modelled the relationships between alpha-opic illuminances and melatonin suppression using an extensive dataset by Brainard and colleagues. Our results show that 1) melatonin suppression is better predicted by melanopic illuminance compared to other alpha-opic illuminances, 2) melatonin suppression is predicted to occur at levels as low as ~1.5 melanopic lux (melanopsin-weighted irradiance 0.2 μW/cm2), 3) saturation occurs at 305 melanopic lux (melanopsin-weighted irradiance 36.6 μW/cm2). We then tested this melanopsin-weighted illuminance response model derived from Brainard and colleagues’ data and show that it predicts equally well melatonin suppression data from our laboratory, although obtained using different intensities and exposure duration. Discussion: Together, our findings suggest that melatonin suppression by monochromatic lights is predominantly driven by melanopsin, and that it can be initiated at extremely low melanopic lux levels in experimental conditions. This emphasizes the concern of the non-visual impacts of low light intensities in lighting design and light-emitting devices.
关键词： melatonin,light,mathematical model,dose-response relationship,humans,circadian,melanopsin
更新于2025-09-19 17:15:36
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Roblems, Methods, and Algorithms in Models of Physical Fundamentals of Elements of Optical Computers
摘要： This paper considers two variants of problems that arise in developing optical computers. The first variant is related to the mathematical analysis of problems of optical bistability in the case of multibeam interaction of laser radiation in nonlinear media. The existence of optical bistability is confirmed by the results of solving the boundary value problem for a system of nonlinear ordinary differential equations. In the general case of an arbitrary nonstationary process, the problem is reduced to solving a system of two nonlinear integral equations with respect to complex amplitudes describing interference patterns. The second variant of problems is devoted to studying the absorption and scattering of light by nanomaterials. As a result, a multidimensional integral equation was obtained for the complex amplitude of the electric field. A fundamentally important feature of this equation is its singularity inside a nanoparticle.
关键词： optical computer,laser interaction,mathematical model,bistability,integral equation
更新于2025-09-19 17:15:36
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High-Performance Emulator for Fixed Photovoltaic Panels
摘要： This paper presents the design and implementation of a photovoltaic emulator, based on an accurate mathematical model of a photovoltaic panel, instead of the look-up table method. The latter requires more memory for increasing accuracy and considering all the desired environmental situations. Furthermore, the proposed approach takes into account the incidence solar angle, as an input parameter, to offer the possibility of evaluating daily losses for different values of tilt angle. The validation of the proposed emulator is carried out by comparing in real-time, both the studied panel output and the emulator output, under variable load, temperature, and irradiation levels. The emulator is able to operate online with connected solar radiation and temperature sensors or offline with recorded measurement vectors. The practical tests were performed on a prototype designed using a MATLAB C MEX S-function, dSPACE board 1104, and a controlled DC/DC converter. The results showed that the emulator was able to behave accurately as the studied photovoltaic panel.
关键词： DC/DC converter,mathematical model,real-time validation,incidence solar angle,photovoltaic emulator
更新于2025-09-19 17:13:59
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Machinability of titanium alloy through laser machining: material removal and surface roughness analysis
摘要： Laser milling is a competent precision process especially when the work material is hard-to-machine such as titanium alloys. While performing the laser milling, a slight change in one of the laser parameters results in an abrupt change in the machining outcomes. A close match between the designed and the machined geometries is the essence of precision machining. A precise control over the material removal rate per laser scan is highly desirable but difficult to achieve. The difficulty level becomes higher if high surface finish is desired alongside the precision machining. In this research, the objective was set to perform the laser milling on titanium alloy (Ti-6Al-4V) with 100% control over material removal rate (MRR) per laser scan and minimum surface roughness (SR). Influence of the five laser parameters (laser intensity, pulse frequency, scan speed, layer thickness, and track displacement) on MRR and SR has been deeply investigated. Significance of each laser parameter is evaluated through ANOVA. Mathematical models for both the responses are developed to estimate the resulting responses at any parametric setting. Models have also been validated through confirmatory tests. Optimization of laser parameters is of great importance to remove the material exactly equal to the desired depth with minimum surface roughness. Therefore, the optimized combinations of laser parameters have been proposed which ensure the conformance of 100% MRR and minimum surface roughness with composite desirability > 0.9. Confirmatory experiments revealed that the optimized parameters are capable to produce the laser milling results as per the models’ predicted results. Additionally, the microstructure of the subsequent layers below the milled area has also been examined and compared with the microstructure of the bulk Ti-6Al-4V. By the use of optimized parameters, microstructure of the sub-layers remains unchanged as compared with the microstructure of the base metal. No evidence has been found altering the microstructure of the sub-layers.
关键词： Laser milling,Titanium alloy,Mathematical model,Surface roughness (SR),Optimization,Material removal rate (MRR)
更新于2025-09-16 10:30:52