Showing papers by "University of Tabriz published in 1995"
TL;DR: Dopamine is determined in the presence of a high concentration of ascorbic acid, up to 100 times that of dopamine, using ferroceneacetic acid as the most suitable mediator for this purpose using direct-current cyclic voltammetry.
74 citations
TL;DR: A simple and convenient method has been developed for the speciation of chromium(III) and chromium (VI) in aqueous solutions using a sodium dodecyl sulphate coated alumina micro-column and graphite furnace-atomic absorption spectrometry (GF-AAS).
36 citations
TL;DR: In this paper, a computer design package was developed in order to investigate the best way to obtain these goals, by reducing the stator core length by 40%, the frequency regulation and the voltage drop were reduced.
Abstract: The main goals in the design of a self-excited induction generator (SEIG) are minimizing the rotor resistance and increasing the flux density until the magnetic circuit of the generator saturates. In this paper, a computer design package was developed in order to investigate the best way to obtain these goals. By reducing the stator core length by 40%, the frequency regulation and the voltage drop were reduced. The frequency regulation decreased from 10% to 4% and the voltage drop decreased from 30% to 6%. In addition, voltage and frequency regulations in the standard ranges were obtained in the present design without any regulation devices. >
35 citations
TL;DR: The nature and the quantity of anthraquinones and their conjugates were determined with a good precision and accuracy.
25 citations
TL;DR: In this paper, anilines were derived with fluram in citrate buffer media (pH 5.5) to form pyrrolinones and the highly fluorescence pyrronones were isolated and pre-concentrated by solid phase extraction.
Abstract: Fluorescamine (fluram) has been used as a fluorogenic compound for pre-column derivatization of aniline and some derivatives. Anilines were derivatized with fluram in citrate buffer media (pH 5.5) to form pyrrolinones. The highly fluorescence pyrrolinones were isolated and pre-concentrated by solid phase extraction. A reversed phase, Spherisorb RP-8 column and tetrahydrofuran: water:formic acid (42:56:2) mobile phase was used for separation. Detection method was by a sensitive fluorimetric method and quantitation was at 395 and 495 nm. The various parameters such as reaction conditions between anilines and fluram, solid phase extraction and chromatographic separation were optimized. Calibrations were linear over the range considered with excellent correlation coefficients (r>0.999). Relative standard deviations are less than 2.5 % and detection limits for aniline,p-toluidine, 4-chloroaniline and 4-bromoaniline were 6, 30, 6 and 8 ng L−1, respectively. This method has been used successfully for the determination of anilines in environmental waters.
25 citations
TL;DR: In this article, the authors measured the third harmonic generation spectra of epitaxial chloroindium phthalocyanine (ClInPc) thin films in the wavelength range of 970-1650 nm.
Abstract: We have measured the third harmonic generation spectra of epitaxial chloro‐indium phthalocyanine (ClInPc) thin films. The χ(3) spectrum in the wavelength range of 970–1650 nm reveals resonance features of ClInPc. Theoretical analysis of the third‐order nonlinear optical channels in phthalocyanine allows the assignment of the observed resonances to three‐ and two‐photon resonances of χ(3).
24 citations
TL;DR: In this article, a series of N-substituted ester groups were used to synthesize poly(2-ethane-carbohydroxamic acid)pyrrole and carbazole derivatives for conducting polyheteroaromatics.
22 citations
TL;DR: In this article, the flux linkage, mean torque, and efficiency of two prototype switched reluctance motors with multiple teeth per stator pole, with 12 10 and 24 22 slotting, are compared.
22 citations
TL;DR: In this paper, a simple laboratory-made gas stripping and cryogenic trapping system coupled with a gas chromatograph with flame ionization detector as a universal detector has been developed for the determination of traces of volatile halogenated compounds (VHCs) in drinking water.
15 citations
TL;DR: In this paper, the authors describe the development of a computer model to simulate an induction motor including the effects of saturation on leakage and magnetizing inductance, and the model is validated by comparing a sample simulated result with the dynamic performance measured in the laboratory.
15 citations
TL;DR: In this paper, an optimization of a three-phase squirrel-cage induction motor with constraints imposed upon the performance characteristics of the motor is carried out and the results of the optimization consisting of variations of the performance conditions and relative variations of these characteristics, are then compared with the results obtained using simple and modified Hooke-Jeeves methods.
TL;DR: Electrochemical behaviour of some naturally occurring hydroxy derivatives of 9,10-anthraquinone such as chrysophanic acid (Ch), rhein (Rh) and emodin (Em) at mercury and glassy carbon electrodes using two different supporting electrolytes in chloroform is described.
TL;DR: The electrocatalytic effect of the PPy-coated electrode was revealed by oxidation of hydroquinone on it in water and chloroform and the calculated heterogeneous electron transfer rate constant was 1.4 x 10(-3) cm/sec which is 1000-fold greater than the value reported for bare electrode.
TL;DR: In this paper, the authors considered the problem of on-board fault detection and identification in a broad-bandwidth, hydraulic, fully-active suspension system, which is large-scale, nonlinear, as well as stochastic.
TL;DR: The effect of laser irradiation during the deposition process on the structure and photoelectrical, optical and luminescence properties of CdS thin films prepared by the method of chemical spray pyrolysis, are investigated in this paper.
TL;DR: A potentiometric method for the titration of TBAI in chloroform using tetrabutylammonium periodate (TBAPI) as a strong and suitable oxidizing reagent and the reaction between TBAPI and TBAI was used as acid indicator for the potentiometry detection of end points of acid-base titrations in chlorOform.
TL;DR: In a case of true complete diphallia, the orthotopic penis was normal in length, shape and urethra, whereas the ectopic, perianal, penis had a blind-ending urethre, the significant distance between the two making the malformation of an extremely rare type.
Abstract: In a case of true complete diphallia, the orthotopic penis was normal in length, shape and urethra, whereas the ectopic, perianal, penis had a blind-ending urethra, the significant distance between the two making the malformation of an extremely rare type. Right renal agenesis and orthopaedic malformations were also present.
TL;DR: In this paper, an investigation of reading level of the fourth grade Persian textbook in the East Azerbaijan Province of Iran is presented, where the authors compare the reading levels of four grade Persian texts.
Abstract: (1995). An Investigation of Reading Level of the Fourth Grade Persian Textbook in the East Azerbaijan Province of Iran. Compare: A Journal of Comparative and International Education: Vol. 25, No. 2, pp. 179-185.