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The foreseen high penetration levels of wind energy will have serious implications on frequency stability, hence developed control methods of wind turbine and alternative technologies including energy storage should enable the provision of frequency support by wind power. Active research is ongoing to investigate the possibility of collecting and transmitting offshore wind power through low frequency...
Diverse solar irradiance spectra can be observed under different conditions of time, date, location, weather, etc. Since the solar irradiance spectrum is required by certain scientific and engineering applications, obtaining accurate spectral data is essential. Measurements by spectrophotometers are able to achieve accurate real-time data with high resolution, but at high expense. While in some engineering...
KLOE-2 at the e+e− DAφNE φ-factory is the main experiment of the INFN Frascati National Laboratories (LNF) and is the first high-energy experiment using the GEM technology with a cylindrical geometry, a novel idea that was developed at LNF exploiting the kapton properties to build a light and compact tracking system. Four concentric cylindrical triple-GEM detectors, for a total material budget below...
The proposed work aims to enhance the capabilities of the passive microwave measurements on board NOAA and MetOp satellites for snowfall identification. Two independent methods based on the same sensors (AMSU/MHS) were applied and qualitatively inter-compared during snowstorms over Europe by using the NIMROD radar network as ground truth. The first method developed at NOAA is a statistical algorithm...
The KLOE-2 Inner Tracker, the first fully-cylindrical GEM detector ever built, is being commissioned at the Frascati Laboratory of INFN. KLOE-2 is the first experiment exploiting GEM technology with cylindrical geometry. Tracking performance of this novel detector are being studied using both cosmic-ray muon and Bhabha scattering events. Alignment and calibration procedures to reach design spatial...
In this study, we design an electrically activated sucker that can handle workpieces with rough and uneven surface. The new sucker uses a motor to drive blades to form rotation flow in a shell, and the rotation flow generates cupped negative pressure distribution and resulting suction force. Different from the existing suckers, in the new sucker, the rotation flow is formed closely to the upper surface...
This paper reports a microheater-based combustible gas sensor with ultra-low power consumption (1.4 mW) using pulsed heating and novel sensing materials. High surface area graphene aerogel is used as a support for platinum and palladium nanoparticles. Pulsed heating (450 °C) at a 10% duty cycle yields an order of magnitude reduction in power consumption with no loss of sensitivity. Sensing response...
Lumped parameter thermal network (LPTN) is widely used for calculation the temperature rise in electrical machines. In LPTN models, heat transfer process in the motor are abstracted form a thermal point of view and can be described via equivalent circuit diagrams, the thermal capacity is modeled by means of a capacitor, as used for describing electric circuits. Compared to the numerical method such...
Resistive random access memory is one of the most promising non-volatile alternatives to current technologies, such as Flash, due to its simple sandwiched structure, low power consumption, high speed and good endurance1,2. In many cases, the mechanism of resistive switching is believed to be the formation and partial dissolution of nanoscale conductive filaments (CFs) during the set and reset process...
High dynamic range measurements of optical pulse contrast are of great interest for high energy laser pulse characterization. With a device alone, one would either measure the main pulse peak with no information the pedestal or measure the pedestal while saturating or even damaging the detector with t he main pulse. Therefore, to measurement the pedestal without damaging the device, one effectively...
The paper presents a new data driven predictive control approach for a special set of nonlinear systems. A Linear Parameter Varying (LPV) subspace based identification technique is combined with predictive control approach without computing the parameter dependent state space matrices. Therefore, the Subspace based Predictive Control for LPV systems (SPC LPV) is a candidate for joint nonlinear identification...
The paper explores the advantage of Subspace Predictive Control for Linear Parameter Varying systems (SPC LPV) in supervisory and in robust control scheme. Closed-loop subspace identification technique is used to identify the I/O LPV predictor for optimal control application. This type of the SPC LPV is a data driven approach.
In this paper, the polarization error correction of dual-polarized planar scanned array weather radar in alternately transmitting and simultaneously receiving (ATSR) mode is analyzed. A method based on point correction and a method taking the complete array patterns into account are discussed. To analyze their performances, a linear error model is presented and a Monte-Carlo simulation procedure is...
In this paper, the polarization error correction of dual-polarized planar scanned array weather radar in alternately transmitting and simultaneously receiving (ATSR) mode is analyzed. A method based on point correction and a method taking the complete array patterns into account are discussed. To analyze their performances, a linear error model is presented and a Monte-Carlo simulation procedure is...
This paper presents a novel impulse response parameter based solution for internal model control (IMC) within the linear parameter varying framework. First, based on a discrete-time state-space representation, a finite horizon vector autoregressive model with exogenous disturbance (VARX) is obtained to describe the I/O relationship of an affine LPV plant. In this paper, inversion of the VARX model...
Based on state-space model, a kind of method of designing inferential predictive control for dual-rate systems is given. The method has preferable robust stability. State estimator is introduced into dual-rate inferential predictive controller based on state-space model to estimate immeasurable state and solve the problem caused by immeasurable state when designing dual-rate inferential predictive...
This paper is presented as a theoretical analysis for dual-polarized planar phased array radar accuracy requirements in meteorological applications. Based on the local feature of the element pattern, a simplified linear model is developed to approximate the pattern near the beam direction. In order to evaluate the performance under different conditions, a Monte Carlo simulation method is introduced...
An upgrade to the National Spherical Torus Experiment (NSTX) is currently in progress. The NSTX Center Stack Upgrade (NSTX-U) experimental device has an operating space that is both larger and more complex than that of the original NSTX. The mechanical integrity of some machine components can be compromised both by the instantaneous values of combinations of magnet currents and as a result of the...
We presented the efficient performance of Yb:YAG/Cr, Yb:YAG self-Q-switched microchip lasers by bonding Yb:YAG crystal under high-brightness laser-diode pumping. The effects of transmission of the output coupler (Toc) and the pump intensities on the performance of the Yb:YAG/Cr, Yb:YAG self-Q-switched microchip laser were addressed.
A parallel implementation of physical optics (PO) is presented on the graphic card NVIDIA GTX480. Taking the advantage of the characteristic of visible surface detection in PO, an improved Z-buffer detection algorithm for triangle meshes is developed, which can significantly decrease the amount of float point computation. By using reduction operation, we design a fast parallel summing method for the...
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