Volume 37 (2018)
Volume 36 (2017)
Volume 35 (2016)
Volume 33 (2014)
Volume 32 (2013)
Volume 31 (2012)
Volume 30 (2011)
Volume 29 (2010)
Volume 28 (2009)
Volume 27 (2008)
Volume 26 (2007)
Volume 25 (2006)
Volume 24 (2005)
Volume 23 (2004)
Volume 22 (2003)
Volume 21 (2002)
Volume 20 (2001)
Volume 19 (2000)
Volume 18 (1999)
Volume 17 (1998)
Volume 16 (1997)
Volume 15 (1996)
Volume 14 (1995)
Volume 13 (1994)
Volume 12 (1993)
Volume 11 (1992)
Volume 10 (1991)
Volume 9 (1990)
Volume 8 (1989)
Volume 7 (1988)
Volume 6 (1987)
The Conformational Effect of 6-Mono-Substituted and 6,7-Di-Substituted Derivatives of 5,6,7,8-Tetrahydrodibenzo[a,c]cyclo-octene on 13C Chemical Shift

Jamshid Najafpour; Ali Akbar Salari; Forouzan Zonouzi; Mohammad PorghamDaryasari

Volume 34, Issue 4 , November and December 2015, Page 1-11

  Hartree-Fock (HF) and Density Functional Theory (DFT) methods employed to study the effect of conformational change on the 13C chemical shifts of 6-mono axial and equatorial substituted and 6,7-di axial-axial, equatorial-equatorial and axial-equatorial substitutedderivatives of 5,6,7,8-tetrahydrodibenzo[a,c]cyclo-octene. ...  Read More

A Highly Diastereoselective and Enantioselective Phase-Transfer Catalyzed Epoxidation of β-Trifluoromethyl-β,β-disubstituted Enones with H2O2

Shaoxiang Wu; Qi Wang; Yao-Feng Wang; Pran Gopal Karmaker; Fu-Xue Chen

Volume 34, Issue 4 , November and December 2015, Page 13-38

  Trifluoromethylated organic compounds, especially chiral quaternary alcohols bearing trifluoromethyl group are of important intermediates in drugs, agrochemicals and etc.An efficient epoxidation of β-CF3-β,β-disubstituted unsaturated ketones (6) has been developed with environmental benign ...  Read More

Chemical Engineering
Brønsted Acidic Phosphonium Based Ionic Liquid Functionalized SBA-15 [HO3S-PhospIL@SBA-15]: Green, Recyclable, and Efficient Catalyst for the Synthesis of Pyrano[3,2-c]Chromenone Derivatives

Mina Saeedi; Mohammad Jeiroudi; Leila Ma’mani; Mohammad Mahdavi; Eskandar Alipour; Abbas Shafiee; Ali Reza Foroumadi

Volume 34, Issue 4 , November and December 2015, Page 39-45

  The surface of SBA-15 was modified by diphenylphosphine; then, it was treated with butane sultone and sulfuric acid to obtain Brønsted acid HO3S-phosphonium based ionic liquid functionalized SBA-15 with HSO4- as a counteranion. It efficiently catalyzed synthesis of pyrano[3,2-c]chromenone derivatives ...  Read More

Efficient and Eco-Friendly Procedure for the Synthesis of 2-Amino-4H-Chromenes Catalyzed by Diammonium Hydrogen Phosphate

Jun Zhang; Xiaoyun Hu; Zhongqiang Zhou

Volume 34, Issue 4 , November and December 2015, Page 47-51

  An efficient and eco-friendly protocol for the preparation of 2-amino-4H-chromenes employing a multi-component, one-pot condensation reaction between aromatic aldehydes, malononitrile and1-naphthol has been developed. The reaction of 1-naphthol with malononitrile and various aromatic aldehydes was carried ...  Read More

Preparation and Study of Bismuth Oxide Doped and co-Doped with Cobalt(III) and Holmium(III) via Sol-Gel Method

Seyyedeh Marziyeh Hosseini; Abdolali Alemi; Zolfaghar Rezvani

Volume 34, Issue 4 , November and December 2015, Page 53-59

  In this research work the solid-solutions of (Bi2O3)1-x (Co2O3)x, [x= 0.05, 0.1] (1), (Bi2O3)1-x (Ho2O3) x, [x= 0.025, 0.05] (2), and (Bi2O3)1-x-y (Co2O3)x (Ho2O3)y, [x=0.05] ; [y= 0.01, 0.02] (3) have been synthesized  using sol-gel method. The effects of transition metal oxides doping on the crystallization ...  Read More

Extraction of Ni and Co via D2EHPA in the Presence of Acetate Ion

Hamed Nadimi; Davoud Haghshenas Fatmehsari; Sadegh Firoozi

Volume 34, Issue 4 , November and December 2015, Page 61-67

  The effect of acetate ion introduced to aqueous solutions was investigated for the extraction/separation of Ni and Co from a dilute sulfate media. The separation of Co and Ni was improved by introducing acetate to aqueous media. By the use of the slope analysis method,the stoichiometric coefficient of ...  Read More

Chemical Engineering
Thermo-Oxidation and Biodegradation Study of Low-Density Polyethylene /Starch Films by IR Spectroscopy

Nabila Rouba; Tahar Sadoun; Naima Boutagrabet; Djamila Kerrouche; Salem Zadi; Nassiba Mimi

Volume 34, Issue 4 , November and December 2015, Page 69-78

  This article reports a study of the thermo-oxidation and biodegradation in the soil of low-density polyethylene/starch films (LDPE/starch) by infrared spectroscopy: Films of LDPE/Starch blends of different composition (starch content range from 0 to 15% w/w),were prepared and exposed to thermo-oxidation ...  Read More

Mineral Contents and Bioactive Properties of Centaura spp. Leave and Seeds

Hakkı Gökbel; Mehmet Musa Özcan; Ahmet Duran; Mehmet Hamurcu; Mustafa Çelik; Nurhan Uslu; Tijana Demiral

Volume 34, Issue 4 , November and December 2015, Page 79-88

  The mineral contents of Centaura leave and seeds were determined by Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES). Macro element concentrations (P, K, Ca, Mg and S) of samples were found at high levels. K was established at high level in both leave and seed samples of Centaurea. ...  Read More

A Novel Carbon Paste Electrode for Potentiometric Determination of Vanadyl Ion

Abolfazl Darroudi; Hossein Eshghi; Shima Rezaeian; Mahmoud Chamsaz; Mehdi Bakavoli; Kamahldin Haghbeen; Akram Hosseiny

Volume 34, Issue 4 , November and December 2015, Page 89-96

  Carbon paste electrode was modified by disodium 2,4-diamino-7-methylbenzo[g] pteridine-5,10-dioxide to fabricate a sensor for potentiometric determination of vanadyl ion (VO2+) in aqueous medium. The new ligand was synthesized in three steps with high yield. The optimal composition of the carbon paste ...  Read More

Chemical Engineering
Prediction of the Liquid Vapor Pressure Using the Artificial Neural Network-Group Contribution Method

Ali Tarjomannejad

Volume 34, Issue 4 , November and December 2015, Page 97-111

  In this paper, vapor pressure for pure compounds is estimated using the Artificial Neural Networks and a simple Group Contribution Method (ANN–GCM). For model comprehensiveness, materials were chosen from various families. Most of materials are from 12 families. Vapor pressure data of 100 compounds ...  Read More

Chemical Engineering
Numerical Investigation of Turbulent Mass Transfer in a 90° Bend

Tahereh Asadi; Mohsen Nasr Esfahany

Volume 34, Issue 4 , November and December 2015, Page 113-121

  This paper presents a numerical study of local mass transfer coefficients in a 90° bend using the RNG version of k–e model to include the influence of curvature on the turbulent transport. Simulations were performed for flow through a 90°, 3-D bend for Reynolds numbers of 13500, 90000, ...  Read More

Chemical Engineering
CFD Simulation of Gas-Solid Two-Phase Flow in Pneumatic Conveying of Wheat

Ali Sarrami Foroushani; Mohsen Nasr Esfahany

Volume 34, Issue 4 , November and December 2015, Page 123-140

  Computational Fluid Dynamics (CFD) simulations of gas-solid flow through a positive low-pressure pneumatic conveyor were performed using Eulerian-Eulerian framework. Pressure drop in pneumatic conveying pipelines, creation and destruction of plugs along the horizontal and vertical pipes, effect of 90° ...  Read More