Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
In the preliminary design process of switched reluctance machine (SRM), adjusting the number of wingding turns or cross-sectional area of conductor to optimize windings design has dramatic effects on the performances like torque density, efficiency and thermal dissipation and so on. However, the difficulty exists on how to guarantee these performances while optimizing winding design. This paper proposes...
This paper proposes a novel moving-coil voice coil motor(VCM) used for driving nano-positioning device. This VCM implements bilateral Halbach array permanent magnet as the stator and three separated coils with the slotted coil skeleton as the mover. The VCM can achieve large stroke and nano-level positioning accuracy with the support of the compliant mechanism. Equivalent magnetic circuit method and...
Adaptation is an essential capability for intelligent robots to work in new environments. In the learning framework of Programming by Demonstration (PbD) and Reinforcement Learning (RL), a robot usually learns skills from a latent feature space obtained by dimension reduction techniques. Because the latent space is optimized for a specific environment during the training phase, it typically contains...
In a modular uninterruptible power supplies (UPS), each DC/AC module was designed to work in a circular way considering the reliability and power stress issues of the whole system. Thus unsynchronized PWMs will occur if any of the DC/AC modules is plugged in or out of the system at any time. On the other hand, modular difference is another issue that will bring such kind of circulating current. In...
We experimentally observe the spectral dynamics of a passively mode-locked fiber laser by using a parametric spectro-temporal analyzer (PASTA) with a frame rate up to 100 MHz, and different non-repeating transient dynamics has been observed.
Performance of the spectral-domain optical coherence tomography is limited by its Ascan rate, namely the frame rate of spectrometer. In this paper, 60-MHz A-scan rate is achieved by adopting a recently demonstrated parametric spectro-temporal analyzer.
Wavelength-encoded tomography (WET) is upgraded to a triple-time-lens system to perform ultrafast cross-sectional imaging through 68.4x-temporal magnification. 60-MHz A-scan rate is demonstrated by imaging a glass sample with 180-μπι axial resolution.
Understand the tomography system as a temporal microscopy by space-time duality, a simple adjustment was performed on a conventional swept-source optical coherence tomography (SS-OCT), and achieved sharper resolution (∼4 μm) for the single layer measurement.
A new method of collaborative simulation of chemical reaction, fluid flow and heat transfer based on OpenFOAM is proposed. Then a case study of shell-and-tube reactor for a single shell and several reaction tubes pass reactor with a variable number of baffles and turbulent flow is performed. The results are observed to be sensitive to the turbulence model selection. The best turbulence model among...
In this paper, an adaptive critic design (ACD) based control algorithm is proposed for road tunnel ventilation systems with jet fans. Firstly, a comprehensive dynamic model is established for control purpose, which considers both the static and dynamic nonlinearities between the pollutant concentration and the jet speed or the air flow inside the tunnel. Vehicle speed and density are also integrated...
This paper proposes a new structure of free-piston linear generator (FPLG) which consists of double two-strokes combustion chambers with inner and outer piston-couples and a linear electric generator with multi-movers in order to improve the system efficiency. The one-dimensional thermodynamics model of the combustion chambers and the model of the linear electric generator have been respectively derived...
A highly sensitive curvature sensor based on a single mode-few mode-single mode fiber offset splicing structure cascaded with long-period fiber grating is proposed and demonstrated. High-order mode is inspired by the offset splicing structure and coupled into the LPFG, resulting in a splitting into two dips of LPFG attenuation band, which are more sensitive to the external environment change. The...
This paper focuses on the cooperative localization problem in sensor networks where the objective is to estimate the sensor positions. Communications among the sensors can reduce the need for global observations (e.g. GPS data), and render the estimation distributed. However, these problems usually involve nonlinear models and non-Gaussian distributions. Two techniques are studied and compared to...
In this paper, a simplified control architecture, including individual layer control and recover layer control, is proposed for a modular online uninterruptible power supply (UPS) system is presented. The parallel control algorithm of for the DC/AC modules are mainly concentrates on the active power sharing performance due to the existence of the shunt active power filter (APF). APF will deal with...
In this paper a control strategy for the parallel operation of three-phase inverters in a modular online uninterruptable power supply (UPS) system is proposed. The UPS system is composed of a number for DC/ACs with LC filter connected to the same AC critical bus and an AC/DC that forms the DC bus. The proposed control is designated in two layers, individual layer and recovery layer. In individual...
In this paper, we present SOBO, a novel hybrid MAC protocol using sequentially ordered backoff in wireless LANs. SOBO eliminates packet collisions and wasted idle backoff slots by introducing implicit resource reservation into 802.11 DCF. In SOBO, the AP divides time into repeating cycles by beacon frames. Exploiting the implicit information of successful transmission order in every cycle, sequentially...
This paper provides the complete progresses of designing, simulating and constructing of a wireless power transfer (WPT) system. Moreover, investigations on the transmission efficiency for different magnetic materials under varying operating frequencies in the designed wireless power transfer system were conducted. After building a contactless power transfer system with a large inductor as a current...
The Electric vehicle (EV) will become futuristic and promising for its advantages such as pro-environment, high energy efficiency and so forth. However, Due to the boundedness of batteries, EVs must be recharged very frequently. In this paper, we propose a secure and privacy-preserving payment system for EVs to charge their batteries with reservation service. A user can only reserve a limited number...
Activity recognition of multi-individuals (ARMI) within a group, which is essential to practical human-centered robotics applications such as childhood education, is a particularly challenging and previously not well studied problem. We present a novel adaptive human-centered (AdHuC) representation based on local spatio-temporal features (LST) to address ARMI in a sequence of 3D point clouds. Our...
Electroencephalogram (EEG) is susceptible to various non-neural physiological artifacts. Automatic artifact removal from EEG remains a great challenge for extracting relevant information from brain activities. In order to adapt to variable subjects and EEG acquisition environments, this paper presents a novel automatic artifact removal method based on prior artifact information. First, the wavelet-ICA...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.