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In view of the shortcomings of traditional fault diagnosis system in accuracy, robustness and too complicated recognition algorithm, the distributed intelligent fault diagnosis system is presentation based on ZigBee technology and particle filter. Multi variable data's acquisition and centralized treatment is realized through the wireless sensor network, and the accurate estimation of the state of...
This paper reviews applications of artificial neural networks (ANNs) to several distinct problem areas that arise in compound semiconductor device modeling and characterization. Properties and corresponding benefits of ANNs for these applications are presented culminating in an accurate large signal-model of GaN HEMT transistors (with thermal and trapping effects). Smooth functional approximations...
Based on theoretical analysis of dynamic mass balance and vapor-liquid phase balance, a state-space model of a methanol/water binary batch distillation pilot plant was developed with an empirical temperature-composition relationship model to estimate the composition of the top distillate. As the nonlinearity and non-stationary characteristics of the batch process, the development and experimental...
In the article a new optimization approach for thermal processes modeling has been presented. In the designed method, the considered process is monitored by a measurement system with a thermal camera. Then, a spatio-temporal dynamics is discretized and transformed into a large-scale optimization problem with differential-algebraic constraints. To preserve the process dynamics in the assumed range,...
In this study a practically feasible Input-Output linearizing feedback law is introduced and tested on an experimental setup. The test setup is representative of part of a medical handheld diagnostics device, requiring fast and accurate temperature control in large temperature ranges. The setup is modelled with an in-house developed lumped mass modelling tool to allow for efficient controller design...
Thermal management is one of the key issues arising in designing light-emitting diode (LED) based luminaire products. Dynamic compact thermal models (DCTMs) are required to predict the thermal behaviour of LED packages fast and accurately in system level simulations. The European Delphi4LED consortium aims to develop multi-domain (electrical-thermal-optical) compact models. One of its targets is to...
This brief addresses the control problem of distributed parabolic solar collectors in order to maintain the field outlet temperature around a desired level. The objective is to design an efficient controller to force the outlet fluid temperature to track a set reference despite the unpredictable varying working conditions. In this brief, a bilinear model-based robust Lyapunov control is proposed to...
The performance of an FPGA based CNN accelerator is determined by both parallelism and frequency, however, most prior works optimize the parallelism in the RTL design and resolve the frequency after the synthesis. This paper presents a design space exploration method for the pipeline implementation of the deep CNN models, which concurrently optimizes parallelism and frequency to achieve a comprehensive...
3D sequential integration requires top FETs processing with a low thermal budget (500°C). The analysis of the origin of the performance difference between Low Temperature (LT) MOSFET and high temperature standard process must take into account a potential EOT modification for short gate lengths. In this work, the difficulty of precise EOT extraction for scaled devices is observed by CV measurements...
The cut-off frequencies of silicon-germanium hetero-junction bipolar transistors (SiGe HBTs) have entered the THz range at the cost of high current density and relatively low breakdown voltages. Typically, the common-emitter breakdown voltage with open base (BVCEO) is used to indicate the allowed breakdown voltage related operation limit. However, an open base (i.e. an infinite source impedance) is...
A method for the determination of the thermal parameters of a cylindrical Li-ion battery by using heat flux measurements is analysed. The method for the determination of the thermal parameters, such as though-plane thermal conductivity and heat capacity, is based on the cylindrical cell battery model, which is explained in detail. The analysis of the applicability of the considered method and its...
The nonlinear plants with significant time delays are difficult to be controlled by classical means. In the present paper intelligent approaches are applied for the design of a nonlinear Smith predictor for compensation of the plant time delay based on a Takagi-Sugeno-Kang plant model and a fuzzy logic parallel distributed compensation (PDC). The design and the advantages of the PDC-Smith are illustrated...
In this paper an ultrasonic reflectometry approach to measure the thermal conductivity and temperature of a material by contact is presented. This device can be utilized for monitoring material properties during manufacturing, and robotic handling of objects. The sensor comprises an AlN piezoelectric ultrasonic transducer operating at GHz frequencies, situated on one side of a silicon chip. The transducer...
This paper presents an efficient method to measure physical parameters of thin elastic layers by using an air-coupled ultrasound technique. In the method, surface densities of elastic thin layers are approximated through solely non-contact measurement of through-transmission of ultrasonic signals. A copper foil and a copper foil coated with carbon composite on both sides are used to experimentally...
The mathematical model for temperature field analysis of the new hybrid magnetic bearing has been presented in the paper. The distributions of temperature which have been obtained from 2D and 3D simulations were compared with the results from the physical model testing of the hybrid bearing.
High intensity focused ultrasound (HIFU) is a non-invasive thermal ablation technique. To perform the ablation procedure safely, temperature monitoring is employed to preserve healthy tissues while simultaneously ensuring that the targeted region is completely ablated. Ultrasound (US) thermometry techniques have the advantages of cost-effectiveness and portability over other medical imaging modalities...
The known algorithm of mass flow rate determination via output pressure curves in gas production and transport systems has been generalized for the case of inner tube cross section changing in time and should be determined together with gas pressure and temperature. An example of calculations corresponds to a real case of gas field in permafrost region.
For the implementation of a 6LoWPAN Home Automation Network with sensor nodes, router, border router, home automation server and user interfaces a sensor node was required. An application which includes temperature, humidity and soil moisture measurement is a plant sensor. From such a sensor node platform, simple room temperature or humidity sensor nodes can be derived. The values of the sensor are...
Comparators are a critical element of Analog-to-Digital converters (ADCs) intended to operate in a harsh environments such as the automotive. The influence of temperature on key comparator properties such as the delay must be well understood to maximize their speed. In this paper a Double-Tail latch analysis leads to an analytical expression for the delay to more accurately guide the design over a...
The parameter extraction method of De Soto is implemented in the single diode model and evaluated against measured data at varying temperatures and irradiances. The simulated current-voltage-curves (IV-curves) of the method can be seen as acceptable at reference conditions, but they result in a different IV-curve, not matching the measured IV-curve, at conditions that differ from the reference conditions...
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