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Dadras, S.,Liu, Y.,Chai, Y.S.,Daadmehr, V.,Kim, K.H. Elsevier 2009 Physica. C, Superconductivity Vol.469 No.1
<P><B>Abstract</B></P><P>The effects of carbon nano-tubes (CNTs) on the crystal structure and superconducting properties of YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7−</SUB><I><SUB>δ</SUB></I> (Y-123) compound were studied. Samples were synthesized using standard solid-state reaction technique by adding CNT up to 1wt% and X-ray diffraction data confirm the single phase orthorhombic structure for all the samples. Current–voltage measurements in magnetic fields up to 9T were used to study the pinning energy <I>U<SUB>J</SUB></I> and critical current density <I>J</I><SUB>c</SUB> as a function of magnetic field at fixed temperature. We find that while <I>T</I><SUB>c</SUB> does not change much with the CNT doping (91–92K), both <I>U<SUB>J</SUB></I> and <I>J</I><SUB>c</SUB> increase systematically up to 0.7wt% CNT doping in a broad magnetic field ranges between 0.1 and 9T and <I>J</I><SUB>c</SUB> in the 0.7wt% CNT doped sample is at least 10 times larger than that of the pure Y-123. The scanning electron microscope image shows that CNTs are forming an electrical-network between grains. These observations suggest that the CNT addition to the Y-123-compounds improve the electrical connection between superconducting grains to result in the <I>J</I><SUB>c</SUB> increase.</P>
Hall anomaly in CNT-doped Y-123 high temperature superconductor
Dadras, S.,Manivannan, N.,Kim, K.H.,Daadmehr, V.,Akhavan, M. North-Holland 2010 Physica. C, Superconductivity Vol.470 No.5
In order to study the Hall effect in pure and CNT-doped Y-123 polycrystalline samples, we have measured the longitudinal and transverse voltages at different magnetic field (0-9T) in the normal and vortex states. In the normal state, the Hall coefficient is positive and decreases with increasing temperature, and can be approximately fitted to R<SUB>H</SUB>=a+bT<SUP>-1</SUP>. We have found a sign reversal in the pure sample for the magnetic field of about 3T, and double sign reversal of the Hall coefficient in the 0.7wt% CNT-doped sample at about 3 and 5T. The Hall resistivity in our samples depends on the pinning.
Determination of Buprenorphine in Raw Material and Pharmaceutical Products Using Ion-pair Formation
Amanlou, Massoud,Khosravian, Peghah,Souri, Effat,Dadrass, Orkideh Ghorban,Dinarvand, Rasoul,Alimorad, Mohammad Massoud,Akbari, Hamid Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.2
A simple and sensitive extractive spectrophotometric method has been described for the determination of buprenorphine either in raw material or in pharmaceutical formulations. The developed method is based on the formation of a colored ion-pair complex (1 : 1 drug/dye) of buprenorphine and bromocresol green (BCG) in buffer pH 3 and extracting in chloroform. The extracted complex shows absorbance maxima at 415 nm. Beer's law is obeyed in the concentration range of 1.32-100.81 μ g mL-1. The proposed method has been applied successfully for the determination of drug in commercial sublingual tablets and injectable dosage form. No significant interference was observed from the excipients commonly used as pharmaceutical aids with the assay procedure.
Determination of Buprenorphine in Raw Material and Pharmaceutical Products Using Ion-pair Formation
Massoud Amanlou*,Peghah Khosravian,Effat Souri,Orkideh Ghorban Dadrass,Rasoul Dinarvand,Mohammad Massoud Alimorad,Hamid Akbari 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.2
A simple and sensitive extractive spectrophotometric method has been described for the determination of buprenorphine either in raw material or in pharmaceutical formulations. The developed method is based on the formation of a colored ion-pair complex (1 : 1 drug/dye) of buprenorphine and bromocresol green (BCG) in buffer pH 3 and extracting in chloroform. The extracted complex shows absorbance maxima at 415 nm. Beer's law is obeyed in the concentration range of 1.32-100.81 m g mL-1. The proposed method has been applied successfully for the determination of drug in commercial sublingual tablets and injectable dosage form. No significant interference was observed from the excipients commonly used as pharmaceutical aids with the assay procedure.