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.
Permanent magnet synchronous machines (PMSM) have dominated several key industries such as electric propulsion of electric and hybrid electric vehicles. This is primarily due to the introduction of temperature tolerant, high energy rare earth magnets over the past two decades. The proposed magnetic configuration presented in this paper introduces an opportunity for optimal generation of electromagnetic...
We present an electromagnetic energy harvester using rotational eccentric mass structure that generates power from extremely low-frequency motion of a driven mechanical swing-arm (i.e. pendulum) that is intended to mimic wrist motion during regular walking. It consists of two aligned eccentric rotors, which rotate together, containing multiple N52 permanent magnet pole-pairs with back iron shields...
This paper proposed a novel modeling method of bonding wires array for internally matched network for high power and high efficiency power amplifier design. Based on this modeling method, a 120 W X-band internally-matched AlGaN/GaN PA under continues wave (CW) condition is presented. The proposed power amplifier can provide a relatively stable output power above 50.6 dBm (115 W) and power added efficiency...
This paper proposed a novel internally pre-matching network for high power and high efficiency power amplifier design. Based on this matching network, a push-pull GaN power amplifier with the high saturated output power of 805 W and peak PAE of 74.5% is realized. The proposed power amplifier can provide a relatively stable output power above 58.5 dBm (707 W) in the band of 400 MHz to 500 MHz while...
We describe an approach to the design, analysis, and control of hybrid systems which is data intensive in contrast to more traditional approaches which tend to be compute-intensive. A key idea is to use a low overhead, high performance persistent object manager to trade space for time, even when the amount of data is very large. The main advantage is that near real time solutions to problems can be...
With ever increasing concern about energy and environmental problems, Electric Vehicles(EVs) have been paid great attention in the recent years. A self-decelerating PM in-wheel motor[1], which features in combining coaxial magnetic gear with normal outer-rotor PMSM, has great advantages over free maintenance and low-speed high-torque output. Thus, it is particularly suitable for direct-driving in...
XLPE-silicon rubber interface is the weakest part of cable system. Dielectric breakdown called tracking failure of the interface often occurs. The failure endangers the reliability of power delivery. Massive application of power electronics easily causes over voltage or high electric field of impulse in power system, and leads to discharge or tracking failure of the interface. Therefore, it is very...
Micro-cavity may possibly be introduced into the XLPE-silicon rubber interface in installation of XLPE cable joint. This type of defect greatly decreases the interfacial breakdown strength and endangers the stability of power system. However, the tracking failure process is still unknown. In this paper, three types of interfaces with different dimension of micro cavity were setup by pressing together...
The Developing World Healthcare Technology Laboratory (DHTLab) at Duke University has developed a comprehensive, open-source biomedical equipment technician's (BMET) library. In this work we experimented with making the DHTLab BMET library and medical equipment manuals available via electronic reader (e-reader). In this paper we describe an early deployment of e-readers to Haiti. The results were...
We have demonstrated the reduction of reflectance in curvilinear lamellar hyperbolic metamaterials and hyperbolic metamaterials with deposited TiO2 scatterers. The effect is accompanied by an enhancement of the sample's transmission and its non-reciprocity.
In this work, we demonstrate the layer-by-layer epitaxy of Mg-composition graded ZnMgO/ZnO heterostructure on sapphire substrate by MOVPE technique. The polarization field tailored by the graded heterostructure induces wide electron slabs with high mobility at low temperature. The transport properties and mechanisms have been discussed in details.
This paper investigates the effect of nano-scale Al2O3 on the tracking failure resistance of silicone rubber nanocomposites. The samples were prepared by filling nano-scale Al2O3 in silicone rubber with the weight ratios of 0.25, 0.5, 1, 1.5, 3 wt%. AC voltage (0 kV-50 kV) was applied on a pair of needle-plate electrodes on the nanocomposites surface with insulation distance of 10 mm. The weight loss,...
This paper presents a new real time lane detection and tracking system which succeeds in sharp curved roads. The Warp Perspective Mapping (WPM) method was used to change the video image perspective to top view. A two dimensional Gabor filter and vertical pixel density calculation method was used to find initial lane regions. Second derivative approach of Composite Bezier spline fitting method calculates...
In this paper, we consider solutions of a real-life dielectric problem using CTF and JMCFIE formulations. We offer two novel preconditioners, namely ASP and ISP, to overcome the convergence problem. The matrix equation obtained from JMCFIE benefits more from preconditioning and it is solved faster than the one obtained from CTF. However, a comparison of the near-zone fields shows that solutions obtained...
This paper investigates the effect of nano-scale SiO2 on the tracking failure properties of nanocomposites. Test samples were made by dispersing nano-scale SiO2 powder in epoxy with the weight ratios of 0, 1, 3, 5, 7, 9 wt%. AC voltage was applied on a pair of needle-plate electrodes at the surface with the insulation distance of 10 mm. The time to tracking failure and discharge current were recorded...
This paper investigated the effects of interfacial pressure on the discharge and tracking failure at the interface between XLPE and silicon rubber by analyzing the distribution of discharge light emitted during the failure process. The test sample was made by pressing together a piece of XLPE and a piece of transparent silicon rubber with the pressure of 20 kN/cm2, 100 kN/cm2 and 300 kN/cm2, respectively...
Vessel extraction has important role to determined eye's vessels changing that are occured by systemetic disease. In this study;included the extraction of vessel's centerlines. Since blood vessels often present poor contrast and narrow vessels width, the multiscale matched filter used with thresholding method used to extraction of blood vessels. Thinning algorithm applied to multiscale matched filter...
Clinical Electrophysiologic tests derived from human eyes are the tests that use to review whole visual pathways and they are important for ophthalmology and neuro ophthalmology. Electroretinographies is one of the electrophysiological tests often used to investigate the electrical response of the retinal layers from retinal pigment epithelium up to the occipital cortex. ERG signals have two important...
In 2006, Jun et al presented a novel non-interactive verifiable secret sharing scheme constructed by Shamir's secret sharing scheme for secure multi-party communication protocol in distributed networks. In their scheme, the Dealer only publishes one commitment for verification. The efficiency of verification for each share doesn't fall as the augment of the threshold and the security of the verifiable...
An integrated network platform for Beizao Mine of Longkou Mining Group which is formed by seas digital system and industrial ring Ethernet+fieldbus is analyzed. Based on this platform, "five major information systems" of Beizao Mine which are office automation system, production safety monitoring system, underground staff location system, seas industrial area television and gas detector...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.