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A 3D finite element model of heat and fluid flow in welding pool considering free surface of the pool and traveling speed has been developed. To validate the model predictivity, numerical and experimental sensitivity analyses were conducted using a design of experiments approach. The method FEM is used to compute all the governing equations and the method' front tracking' has been used to solve capillarity...
In this paper, the energy conservation law in physics is introduced into the control prototype of boost converters. Firstly, the input and output energy and the energy changes in the reactive components in each switching cycle are analysed. Then an energy balance control (EBC) method is designed based on the energy conservation law, which is independent of converter work modes, continuous conduction...
Reliability of door system is directly related to the operation safety of railway vehicles. However, door system is with high failure rate. Accurate detection of the early-stage incipient anomalies is an urgent need in the field of railway transportation. This paper proposes an Adaptive Mean Shift Clustering (AMSC) algorithm, which can successfully detect and isolate common and frequent anomalies...
This paper addresses how the various different parameters of the bistatic return from navigation and communication Signals of Opportunity (SoOp) should be considered in bistatic modeling. The coherent and incoherent bistatic returns from Earth's surface are discussed. Furthermore, formulation for modeling ocean surfaces is reviewed for a broad range of SoOp frequencies, and different parameters for...
We report our advances in development of subwavelength engineered metamaterial structures in silicon waveguides, specifically high-efficiency fiber-chip couplers, ultra-broadband surface grating couplers and nanophotonic beam splitters, evanescent field waveguide sensors and on-chip Fourier-transform spectrometers.
Control and limitation of harmonic current emission from new customer installations is essential for maintaining supply voltage distortions below the prescribed compatibility or planning levels, and is also required for ensuring electromagnetic compatibility. At the planning stage, emissions of low-order harmonic current are evaluated based on several assumptions and simplifications related to, e...
We report our advances in development of subwavelength engineered structures for integrated photonics, specifically high-efficiency fiber-chip couplers, broadband surface grating couplers and ultra-broadband nanophotonic beam splitters.
We investigated selective etching of SiC in molten KOH + NaOH + Na2O2 mixtures in application to defect analysis. Etch rate was measured as a function of etchant composition, temperature and other process variables. Optimal etching conditions were established for reliable differentiation between TSDs, TEDs, BPDs and stacking faults (SF).
Assuming numerical analysis of a grating problem by Yasuura's method of modal expansion, we compare the approximation power of monopole fields with that of Floquet modal functions. We show that the former is much stronger than the latter.
We present an analytical theory of 2D topologically protected guided photonic modes for continuous periodic dielectric structures, modulated by a domain wall. We then numerically corroborate the applicability of this theory for 3D structures.
This paper introduces a kind of robot which can complete the vascular intervention under doctor's remote control. A manipulator is designed to transmit and rotate the guide wire like a doctor's hand. The robot comprises four manipulators, and it can complete some classical intervention operations what a doctors and an assistant can do during the ordinary vascular intervention. Then the system control...
Nowadays, effective and accurate analysis of customer requirements (CRs) is vital in the new product development process, especially in the early design stage, where corresponding changes can be made easily into the further development stages. Quality function deployment (QFD), acting as a customer-centric product development tool, is widely utilized in the product planning stage. Despite its “House...
CHESS-2 (CMOS HV Evaluation for Strip Sensors) is a novel ASIC strip architecture designed to investigate the feasibility of using HV-CMOS MAPS (Monolithic Active Pixel Sensors) as alternative sensors for the ATLAS Phase-II Strip Tracker Upgrade. The ASIC is optimized for signal processing, hit pixel position encoding and readout. CHESS-2 includes three independent groups of 128 strips composed of...
Continuous increase of numbers of various modern power electronic (PE) devices requires careful investigation of their impact on both operation of distribution networks and other connected equipment. This paper discusses typical harmonic models and modelling techniques, using as examples electric vehicle battery charger (EVBC) and compact fluorescent lamp (CFL). Different models and modelling techniques...
A wide range of modern low voltage power electronic (PE) devices feature sophisticated controls, which aim to improve device performance and ensure better regulation of grid-side ac currents. The implementation of these controls is expected to result in increased device efficiency, improved controllability, higher operating power factors and reduced harmonic emissions. The interactions of individual...
Polarization management is a key functionality in many photonic applications including telecommunications, polarization diversity circuits and sensing, to name a few. Developing integrated circuits capable of reliably controlling polarization state would result in compact and low cost circuits with improved stability, compared with fiber or bulk optics solutions. Polarization rotators are a key building...
We report our advances in development of subwavelength engineered structures for integrated photonics. This unique technology allows synthesis of an effective photonic medium with an unprecedented control of material properties, constituting a powerful tool for a designer of photonic integrated circuits. By locally engineering the refractive index of silicon by forming a pattern of holes at the subwavelength...
Subwavelength engineering in silicon photonic integrated circuits is a powerful design tool that allows one to synthesize an effective photonic medium with adjustable refractive index. This creates a new degree of freedom in photonic circuit design. We present an overview of the fundamental concept and its application to address several important practical challenges in the implementation of silicon...
We report our recent advances in development of subwavelength engineered dielectric metamaterial structures for integrated photonics. By locally engineering the refractive index of silicon by forming a pattern of holes at the subwavelength scale it is possible to manipulate the flow of light in silicon nanophotonic waveguides [1], [2], [3], [4], [5], [6]. Specifically, we present a broadband fibre-chip...
In this paper, an ultra-wideband (UWB) bandpass filter with a notch band is presented. It consists of a stub-loaded resonator and two feeding lines. The proposed resonator, with a center-loaded short stub and two open stubs, is theoretical analyzed by even- and odd-mode analysis. The first four resonance frequencies can be conveniently adjusted and this enables the convenient design of UWB filters...
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