Time filter

Source Type

Hyderabad, India

Liu L.,Harbin Engineering University | Jiang Y.,Harbin Engineering University | Wan L.,Harbin Engineering University | Tian Z.,Control Laboratory
The Scientific World Journal

Due to the polarization mismatch of the antenna, the received signal suffers from energy loss. The conventional beamforming algorithms could not be applied to the conformal array because of the varying curvature. In order to overcome the energy loss of the received signal, a novel joint polarization-space matched filtering algorithm for cylindrical conformal array is proposed. First, the snapshot data model of the conformal polarization sensitive array is analyzed. Second, the analytical expression of polarization sensitive array beamforming is derived. Linearly constrained minimum variance (LCMV) beamforming technique is facilitated for the cylindrical conformal array. Third, the idea of joint polarization-space matched filtering is presented, and the principle of joint polarization-space matched filtering is discussed in detail. Theoretical analysis and computer simulation results verify that the conformal polarization sensitive array is more robust than the ordinary conformal array. The proposed algorithm can improve the performance when signal and interference are too close. It can enhance the signal-to-noise ratio (SNR) by adjusting the polarization of the elements of the conformal array, which matches the polarization of the incident signal. © 2013 Lutao Liu et al. Source

Bilicia A.,Control Laboratory | Kayab I.,Canakkale Onsekiz Mart University | Yam M.,Canakkale Onsekiz Mart University
Designed Monomers and Polymers

It is already known that phenolic monomers bearing electron-withdrawing groups could hardly be polymerized by oxireductases. In this paper, enzymatic polymerization (EP) of phenolic monomers possessing electron-withdrawing aldehyde side-groups, protocatechualdehyde (PCA) and pyrogallolaldehyde (PGA), is presented. The monomers were converted to their polymers via enzyme-catalyzed oxidative polymerization in buffered-dioxane solution using horseradish peroxidase as the catalyst and hydrogen peroxide as the oxidant. The resulting products (abbreviated as PPCA and PPGA) were characterized by means of UVVis, FT-IR, 1H-NMR, GPC (gel-permeation chromatography), TG-DTA and DSC analyses. IR and NMR data indicated that the obtained polymers consisted of a mixture of phenylene/oxyphenylene units, and the aldehyde (-CH=O) side-groups in the polymer chains were not oxidized. The electrical and electrochemical characterizations of the polymers were performed by solid-state conductivity and cyclic voltammetry (CV) techniques, respectively. Fluorescence analyses of PGA and PPGA were also conducted in DMSO. Emission maxima of PPGA were red shifted by nearly 34 nm compared to its monomer. © 2011 VSP. Source

Narasimha Murty B.,Control Laboratory | Ravindra H.R.,Control Laboratory
Journal of the Indian Chemical Society

Sodium diuranate (SDU) produced through hydrometallurgical process such as carbonate leaching process from uranium ores containing high levels of carbonate contains significant levels of organic flocculent. When such a SDU was used as a raw material for the production of nuclear fuel, the flocculant appears in the uranyl nitrate pure solution in a spongy form and makes it hazy. Thus, it becomes mandatory to initially ascertain for content of flocculant in SDU and to look for a means to remove the same completely before processing. This paper describes a method to determine the content of organic flocculant in SDU. The chemical procedure involves complete removal of carbonate present in sodium diuranate by reacting it with phosphoric acid, followed by the determination of the carbon content in the dried residue using a carbon-sulphur analyzer and later correlating the content of the organic flocculent in terms of organic carbon content. The deduction is based on the calibration curve obtained experimentally by carrying out the same methodology using known quantities of organic flocculant both in the absence and presence of SDU (Correlation coefficients (R2) respectively are 0.9998 and 0.9994). By the present method the content of carbon in the organic flocculant determined experimentally both in absence as well as in presence of matrix were found to be 28.97% and 28.48%, respectively, and content of organic flocculant in the SDU was determined to be 1.5%. The moisture content in the organic flocculant was also determined and based on this value it is concluded that SDU contains 1.2% virgin organic flocculent. Source

Qian Y.,PLA Air Force Aviation University | Song J.,Control Laboratory | Guo Y.,Control Laboratory | Fu K.,PLA Air Force Aviation University
International Conference on Communication Technology Proceedings, ICCT

Aimed at the problem of network performance evaluation, a new method based on vague set is proposed. First the network performance attributes are confirmed, then the sample data is transformed to vague value data and weights of attribute are calculated by use of entropy of vague set, finally network performance is evaluated by means of integrating vague set entropy weight with similarity measure. A new transforming formula from single value data to the vague value data and a new formula for similarity measure between vague sets are presented. The results show that the method can make good use of the fuzzy and uncertainty information, the evaluation result is more reasonable and objective. © 2012 IEEE. Source

Wei L.,Jinlin Institute of Architecture and Civil Engineering | Wei L.,Control Laboratory | Jing H.,Jinlin Institute of Architecture and Civil Engineering | Jing H.,Control Laboratory
Proceedings 2011 International Conference on Transportation, Mechanical, and Electrical Engineering, TMEE 2011

In the paper the novel detecting method of harmonic current is proposed. The method is based on the instantaneous reactive power theory and the harmonic current is detected by average current. At the same time the method has the characteristics of simple structure, strong real-time and good dynamic response. In the paper, the proposed method is used to carry out MATLAB simulation for real example. The simulating results show the effectiveness and correctness of the proposed method. © 2011 IEEE. Source

Discover hidden collaborations