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Han C.-H.,Jilin University | Han C.-H.,Control Laboratory | Sang D.-H.,Jilin University | Sang D.-H.,Control Laboratory | Ren Y.,Jilin University
Proceedings 2011 International Conference on Transportation, Mechanical, and Electrical Engineering, TMEE 2011 | Year: 2011

In this paper, designing scheme of unit access control system are proposed. MO4 fingerprint identification module is basis of this scheme and single-chip machine is control center of this scheme. In the scheme design of hardware and software are introduced in detail. The structure of this system is simple and easy to operate. The error rate of fingerprint is very low and degree of intelligence is higher. The system has broad application prospects in safeguard system design of community. © 2011 IEEE.

Guiatni M.,Control Laboratory | Abane A.,Control Laboratory | Kheddar A.,French National Center for Scientific Research
Conference Proceedings - IEEE International Conference on Systems, Man and Cybernetics | Year: 2010

This paper deals with the modeling and instrumentation design for position and torque control of a new designed 4 degrees of freedom (DOF) haptic device to be used in a virtual reality laparoscopic simulator or as an input device for telepresence applications. Low-cost instrumentation is designed for torque/force control using no-contact current sensors and a force sensor. The relations between the applied force/torques and the output voltages are determined by calibration that shows that such low-cost sensors perform just as well as highly accurate sensors. The forward and inverse kinematics models of the 4-DOF are also formulated explicitly by using analytical methods. Based on this models and by introducing the kinematics constraints defined for the parallel part of the device, position control is performed successfully using PD controller. We carried out a PID controller for efficient torque control thanks to the introduced torque sensors. Experimental results that validate and encourage the proposed design are presented. ©2010 IEEE.

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 | Year: 2012

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.

Balaji Rao Y.,Control Laboratory | Ramana B.V.V.,Control Laboratory | Gayathri Raghavan P.,Control Laboratory | Yadav R.B.,Control Laboratory
Journal of Radioanalytical and Nuclear Chemistry | Year: 2012

Energy dispersive X-Ray fluorescence (EDXRFS) method is developed and standardized for the determination of uranium on routine basis in various process stream solutions, covering a vide range of concentrations from 0.1 to 400 g L-1, from an Uranium Extraction Plant at Nuclear Fuel Complex. The method has been applied to aqueous stream samples. Except for dilution, no much sample preparation was involved in the analysis and accordingly the experimental parameters were optimized. The calibration curve in the range of 0.1-10 g L-1 of U was drawn manually using synthetic standard solutions prepared from U3O8 powder and Lα (13.61 keV) line of uranium was used for the measurements. The results from EDXRFS method are compared with other methods and are found to be in good agreement. The EDXRFS measurements carried over a range of 0.1-350 g L-1 of uranium have shown a RSD of ±1-5%. Also, the limitations of reported methods in literature and the advantages of present method are highlighted in the paper. © 2011 Akadémiai Kiadó, Budapest, Hungary.

Liu L.,Harbin Engineering University | Jiang Y.,Harbin Engineering University | Wan L.,Harbin Engineering University | Tian Z.,Control Laboratory
The Scientific World Journal | Year: 2013

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.

Narasimha Murty B.,Control Laboratory | Ravindra H.R.,Control Laboratory
Journal of the Indian Chemical Society | Year: 2013

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.

Datta M.,Control Laboratory | Misra U.B.,Control Laboratory | Rao Y.B.,Control Laboratory | Murty B.N.,Control Laboratory | Ravindra H.R.,Control Laboratory
Exploration and Research for Atomic Minerals | Year: 2013

In this paper a method employing an ion chromatograph to determine nitrogen present in the form of nitride in the magnesium metal is described. The ion chromatographic method involves conversion of the magnesium nitride into ammonium sulphate by dissolution of the sample in sulphuric acid medium followed by determination of the NH4 + ion chromatographically employing a conductivity detector which is an indirect measure of nitrogen concentration. The results obtained for the magnesium samples by the ion chromatographic method compares well with those obtained by microkjeldahl method that involves dissolution of the sample and colour development with Nessler's reagent followed by spectrophotometric finish. In the present method the solution used for ion chromatographic measurement is ideally suited for such a measurement because it is obtained by distillation process and thus is practically a clean solution devoid of dissolved salts. Thus, the present method serves as an alternative routine analytical method for determining nitrogen in magnesium metal sample. In addition the present ion chromatographic method has a marginal edge over the spectrophotometric method with regard to detection limit. The detection limits calculated based on eight blank measurements and a single analysis at 99% confidence level for the ion chromatographic method and spectophotometric method are respectively 7.7 and 12.0 μg of NH 4-N. The ten replicate measurements on magnesium sample by the present ion-chromatographic method showed a RSD of 1% at 10 μg g-1 NH4-N level. Though the concept of conversion of nitrogen present in the nitride form into ammonium ion and its detection through ion chromatography, is applied for determination of nitride nitrogen in magnesium metal, the method is a generic one and can be applied to other matrices as well.

Bilicia A.,Control Laboratory | Kayab I.,Canakkale Onsekiz Mart University | Yam M.,Canakkale Onsekiz Mart University
Designed Monomers and Polymers | Year: 2011

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.

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 | Year: 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.

News Article | October 25, 2016
Site: www.greencarcongress.com

« 2017 Audi A3 replaces 1.8L with Millerized 2.0L TFSI; better fuel economy, power and torque | Main | Washington state to vote on first US revenue-neutral carbon tax in November » Researchers at the Materials Function Control Laboratory at the Toyohashi University of Technology and the Nagoya Institute of Technology have successfully synthesized a new thermoelectric material, CaMgSi, an intermetallic compound. The key to this development was the synthesis procedure; bulk CaMgSi intermetallic compound was synthesized by combining mechanical ball-milling (MM) and pulse current sintering (PCS) processes. The new thermoelectric material is lightweight, with a low density of 2.2 g/cm3. One of the possible applications of the material is in automobiles to utilize waste heat emitted from engines, the research team suggested. A paper on the work is published in the Journal of Alloys and Compounds. Thermoelectric energy conversion through the Seebeck effect is a clean and environmentally compatible power-generation technology. However, thermoelectric devices are less common in practical use because most thermoelectric materials include toxic and/or expensive elements. Previous work by the research team had investigated Mg Si-based systems as suitable thermoelectric materials for the effective utilization of automotive waste heat. The Mg Si intermetallic compound is non-toxic, inexpensive and low-density. Its thermoelectric property can be improved by substituting Ge or Sn for a part of the Si. The researchers had earlier synthesized Mg-Ca-Si thermoelectric materials with a molar ratio of 3:1:2, comprising Mg Si, CaMgSi and Ca Mg Si phases. The Seebeck coefficient (α) of the Ca Mg Si intermetallic compound was that of a metallic behavior (α ≈ 0). Further, Mg2Si is widely known as an n-type compound semiconductor (α 2Si, nevertheless the thermoelectric properties of the materials showed a positive α value. This result suggested to the team that the CaMgSi phase itself has high thermoelectric performance. In general, alloys are produced by mixing the constituent elements in their molten forms. However, the vapor pressures of Ca and Mg are higher than that of Si, and the boiling point of Mg (1363 K) is lower than the melting point of CaMgSi (1507 K) and Si (1687 K). This makes conventional production of CaMgSi problematic. To overcome that problem, the team used a mechanical ball milling process to mix the elements homogeneously, without melting, and then induced a chemical reaction between Ca, Mg, and Si using the pulse current sintering process, said Associate Professor Yoshikazu Todaka. The thermoelectric property of the thus-synthesized CaMgSi exhibited a performance comparable to that of previously developed Mg-based thermoelectric materials. The researchers expect that adding a a fourth element to CaMgSi will further enhance its thermoelectric properties. Interestingly, they found that the novel thermoelectric can exhibit both n- and p-type conductivity with a slight change in the composition of CaMgSi. Such a property for the material is of interest for its application in power-generation modules.

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