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The purpose of the present study is to evaluate the temperature increase due to radio-frequency (RF) exposure in Magnetic Resonance (MR) examinations, by combining electromagnetic/thermal simulations and B1 maps.
In passive remote sensing techniques, the radiometric temperature emitted from a forested canopy is related to the canopy biophysical characteristics. In this study the radiative transfer theory is applied to study the radiometric temperature of a coniferous forest at the microwave band. The forest is modeled as layer above a rough soil surface. The layer is occupied by the leaves and the branches...
Utilization of renewable energy such as photovoltaic power generation and wind power generation is useful to reduce the transport volume of fuel Showa Base in the Antarctica from Japan. However, when a lot of renewable energy systems are connected to the small electric system of the Showa Base, it is possible that the frequency of electric system of Showa Base is not stable. Though the use of battery...
This article deals with the thermal analysis of traction transformer. The traction transformers are special kind of a transformers. The windings have lots of voltage terminals for various voltage levels and various supply systems. In the article is described the thermal mathematical model of traction transformer. The possibilities of simplification of calculation model and high accuracy of simulation...
Model Predictive Control (MPC) is increasingly being proposed for real time application to provide flexible device monitoring and it has become an advanced development trend of embedded technologies. In this paper, practical application of predictive algorithm is proposed to control a thermal system in real time using the high performance processor STM32. The control algorithm is obtained by the implementation...
A coupled-electro-thermal RDS(ON) (drain to source ON resistance) co-analysis methodology for Power MOSFET is proposed. The methodology contains two functional modules: 1) physical field solvers and 2) equivalent circuit/network solver. The field solver resolves the electrical and thermal field variables by the conventional 3D finite-element method, while the network solver can achieve accurate and...
The paper presents the methods for improving the accuracy of impedance measurements to the root system of plants and the ambient temperature. The proposed methods are based on the digital data processing using the maximum likelihood approach, which helps reduce the cost of the measurement devices. A comparison of the achieved measurements accuracy was carried out using the simulation technique.
In this paper we propose a piezoelectric ceramic material and its behaviour when integrated into piezoelectric structures. The piezoceramic element has the shape of a disk with diameter of 12 mm while the width is 0.3 mm. On each of the ceramic disk's sides, silver electrodes were attached. Perovskite ceramics based on lead zirconate titanate (PZT) modified with niobium (Nb) were used to obtain the...
This paper presents a statistical model-fitting framework to efficiently decompose the impact of device Vt variation and power-network IR drop from the measured ring-oscillator frequencies without adding any extra circuitry to the original ring oscillators. The framework applies Gaussian process regression as its core model-fitting technique and stepwise regression as a pre-process to select significant...
This paper describes the development and experimental results of a process control system. The system enabled adjusting film thickness and in-film dopant concentration at the same time on a batch LPCVD machine. By this, anyone could adjust process results easily and exactly in a short time.
Optimization of the real-world problems has been always considered by researchers due to its substantial improvement effect on processes. Modeling, simulation and decision making are three major parts of all optimization approaches. In this paper, Tri-objective optimization of an industrial greenhouse climate control system is investigated. In this regard, the greenhouse is modeled by the real measured...
Thermal comfort in office buildings is emerging as an important variable that can be used to maximize employee productivity. In this paper we propose a new Internet of Things (IoT) based system that creates a personalized model of thermal comfort. To create this model, our system collects telemetry via an IoT network of sensors and user inputs. This data is then input into machine learning algorithms...
The axle temperature of the high speed train is the most direct reflection of the train operating conditions while it is also affected by many factors. The factors which significantly affect the axle temperature are screened out by using the stepwise regression analysis and the prediction equation of the axle temperature is established, so as to compare the predicted data and the measured data. The...
We investigate different criteria for locating sensors for the state estimation in a controlled thermal fluid modeled by the Boussinesq equations. This paper focuses on the linearized Boussinesq equation. We combine optimal sensor location with observer design to obtain a sensor placement. One way to locate sensors is to minimize the covariance of the estimation error. Another way is based on the...
This paper present identification algorithms of the VAG gas valve and a comparison between them. One of the mathematical models is based on the differential-integral calculus of fractional order. This mathematical tool can be used for modeling devices serving to closed-loop systems synthesis. Admitting fractional orders in difference equations improves the performance of proportional-integral-derivative...
In this paper the airspeed control in an open circuit wind tunnel for a velocity range from 5 m/s to 25 m/s is presented. The instrument used for the velocity measurement was a type L Pitot tube, differential pressure, absolute pressure and temperature transducers were used too. Open loop tests were developed in the wind tunnel to determine modeling it through the Toolbox for system identification...
According to the BCF theory, a simple surface diffusion model of SiC single crystal was established, and the key parameters such as the surface diffusion length, the critical nucleation and growth rate were obtained by theoretical calculation. The results show that surface diffusion length is 460nmat 2400K and it decreases with the rise of temperature. The relationship between the critical nucleation...
This paper proposes a simple method to detect and diagnose short circuits and open circuits faults in photovoltaic (PV) systems based on the evaluation of three coefficients. The proposed method consists fundamentally on two steps: an offline step based on a simulated model and an online step in which a comparison of the real measured coefficients against those obtained in the offline step is performed...
This paper proposes a novel MPPT algorithm with a different philosophy wherein the instantaneous operating power point of the PV module is made to directly track the maximum power point. This reference maximum power is computed from the mathematical model of module using the real-time values of module parameters. Unlike other MPPT methods, this technique possesses very fast tracking characteristics,...
Indian government has ambitious plan for solar power generation. The total installed grid connected solar power capacity till 31st March 2016 is 6762.85MW. Indian government has revised its photovoltaic electricity generation targets from 20000MW to 100000MW by 2022 (SESI); it will be a milestone for India's solar photovoltaic industry. Great efforts will be required to achieve these targets apart...
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