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.
This paper presents an accurate analytical surface-potential-based compact model for AlGaN/GaN HEMTs for SPICE-like circuit simulation. Considering the important energy level E0, an easy-implemented analytical continuous expression for the fermi level position Ef was deduced to obtain the surface potential(SP) φs. Then analytical core models for intrinsic charge and drain current are derived based...
In this paper, the transient electromagnetic scattering of the benchmark target, i.e. the NASA almond, is calculated utilizing the marching-on-in-degree time-domain integral equation method with high-level spatial and temporal basis functions. Much memory requirement reduction and unconditionally stable solution in late time can be ensured. The time-domain solution is then Fourier transformed, and...
Nowadays a large number of researches have been focused on properties of epoxy based nanocomposites with an intention to create materials with enhanced properties. Literature review shows space charge behavior in dielectric materials will strongly affect the electrical performance and presence of moisture will influence space charge characteristics. In the present work, owing to the well-known water...
Many approaches have been proposed to improve the quality of low-dose CT images from noisy projections. These approaches can be categorized into three groups: Sinogram filtering approaches, iterative reconstruction approaches and post-reconstruction restoration approaches. Sinogram filtering approaches directly smooth the raw data before filtered back-projection (FBP) is applied. Iterative reconstruction...
This paper proposes an innovative similarity-intensity joint speckle filtering algorithm for the polarimetric synthetic aperture radar (PolSAR). By inducing a newly defined similarity-intensity (SI) parameter, the homogeneous pixels with respect to the central pixel can be selected within a neighboring region based on both the scattering mechanism and the intensity information. The minimum mean-square...
A newly structured 150GHz divider-by-2 injection-locked frequency (ILFD) is designed in a 65-nm CMOS technology. This ILFD uses a new adjustable inductor tuning technique and time-interleaved dual-injection method to improve the frequency division range. A 1-bit binary-weighted switch-capacitor is also used to widen the locking range. From the post-layout simulation result we can see that four self-resonance...
The sensitivities of a Monte Carlo simulation tool (PRESTAGE) to variation of input parameters are studied. When calculating the single event upset cross-section induced by proton direct ionization, PRESTAGE calculation results significantly change with changes in the sensitive volume and passivation layer thicknesses. When calculating cross-sections induced by proton indirect ionizations, PRESTAGE...
A quadrature voltage-controlled oscillator (QVCO) with low phase noise and low power consumption is proposed. In order to improve the oscillation frequency and reduced the phase noise, a feedback network composed of buffer amplifiers and capacitors is introduced to the QVCO. And a newly structured adjustable inductor is also used in QVCO, which can improve the tuning range without adding extra power...
An improved 4H-SiC MOSFET has been presented with fewer static and dynamic losses. The novelty of the structure lies in a combination of a heavily doped n-type epitaxial layer on the drift layer (Current Spreading Layer, CSL) and a p-type implantation introduced in the middle of the JFET area (Central Implant Region, CIR). Heavily-doped CSL could significantly reduce the specific on-resistance by...
Accurate temperature monitoring of the silicon substrate remains to be a key issue for application of novel microwave annealing technology in advanced semiconductor processing. In this paper, a calibration system for temperature monitoring using infrared thermometer pyrometer is designed and temperature accuracy of silicon substrates with various doping concentrations is analyzed. Furthermore, an...
This paper presents a configurable 1/2/3 order Butterworth low pass(LP)/complex bandpass (CBP) filter for sub-GHz Applications in a 180-nm CMOS process. The filter employs operational transconductance amplifier (OTA) unit with feedforward capacitor instead of conventional two-stage amplifiers to broaden bandwidth while consuming no extra power. In order to achieve a good noise figure, extra noise...
A four-stage common-source (CS) amplifier is designed in a 65 nm CMOS process for the unlicensed D-band. Each stage bases on the technique of coupled transmission line (T-line) neutralization to achieve high performance. Transmission line is also used to provide inter stage impedance match together with transformers. T-junction network is used for input and output matching. With the proposed techniques,...
In order to instead high performance xenon lamp light source in the study of photocatalysis, a design of the mechanical pulse beam control device is described in this paper. The MCU XS128 is used as the control core to control servo to achieve the shading and shining time control of the pulse beam. The Visual Basic 6.0 is used to develop PC control system. The communication module is E50-TTL-100 to...
A general memetic trajectory optimization method is introduced. The method is comprised of an evolutionary algorithm (EA) for global optimization, followed by local optimization. The global optimization algorithm is biogeography-based optimization (BBO), which is an EA motivated by the migratory behavior of biological organisms. For local optimization, we start with identifying a local linearized...
A piezoelectric accelerometer based on bulk micromachining was presented in this paper. It is composed of a mass block and four cantilever beams with PZT piezoelectric thin films for detection deposited on cantilever beams. In order to realize the multi-axis detection with a single mass block, beam deformations due to the acceleration in X, Y, Z-axis directions were discussed to determine the corresponding...
A printing moving membrane is studied. The model of the moving membrane with parabolic density is established. Then, the Von-Karman equations expressed by the deflection function and the internal force function of axially moving membrane are derived based on the theory of elasticity. The nonlinear vibration characteristics of the variable density moving membrane under clamped boundary are studied...
The tension control technology of unit-type gravure printing machine is very important. The constant printing tension is the key factor to ensure the overprinting quality. So the research on modeling theory and control technology of control system becomes an important problem to restrict the technology development of unit-type gravure printing machine. In this paper, the winding tension system of...
A new type of tri-axial piezoelectric accelerometer is proposed in this study. It consists of a seismic mass and four cantilever beams that is distributed in a shape of X. Analytical model and FEM analysis were conducted to study its charge sensitivity and the fundamental/first order resonance frequency in the Z-axis, X-axis and Y-axis direction. The errors between the calculated results from analytical...
As to the problem that it is difficult to estimate the parameters of Weibull mixtures accurately, a new parameter estimation method for Weibull mixtures based on the improved cuckoo search algorithm (CSA) is proposed. The optimization model, which is solved by the improved CSA, is established based on the idea of minimizing the residual sum of squares (RSS). The algorithmic improvement has three schemes...
Feature extraction is a critical stage in human activity recognition. The information carried in features directly affects the classification performance. This paper explores a new group of features for activity recognition, which have not been broadly applied in previous works in this field. The newly introduced features are related to the attitude of the on-body devices, being extracted from both...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.