Journal of Scientific & Industrial Research

VOLUME 68

NUMBER 3

MARCH 2009

CONTENTS

Review

181

Applications of metal complexes of Schiff bases-A review

Shalin Kumar1*, Durga Nath Dhar2 &
P N Saxena3


1
Deptt of Chemistry, Hi-Tech Institute of Engineering & Technology, Ghaziabad 201 002, India

2Ex Prof, IIT Kanpur

3Deptt of Chemistry, Bareilly College, Bareilly 243 001, India

Applications of Schiff bases and their metal complexes as catalysts, in various biological systems, polymers and dyes are described. Their use in birth control, food packages and as an O2 detector is also outlined.

S & T and Industrial Research

188

Development of an instrument to measure density and moisture content of Snow



















S K Mittal1*, Manjeet Singh1 & R K Garg2


1
Central Scientific Instruments Organisation (CSIO), CSIR, Chandigarh, India

2Snow & Avalanche Study Establishment, Chandigarh, India

This paper presents design and development of a microcontroller-based instrument to measure snow moisture and density. This instrument makes use of λ/4 RF resonator for measuring complex dielectric coefficient of snow. Snow moisture and density were computed using empirical relations.

192

Numerical simulation of thermal history and residual stresses in friction stir welding of Al 2014-T6









N Rajamanickam1*, V Balusamy2, P R Thyla1 & G Hari Vignesh1



1
Department of Mechanical Engineering
PSG College of Technology, Coimbatore 641 004, India

2Department of Metallurgical Engineering, PSG College of Technology, Coimbatore 641 004, India

In friction stir welding (FSW), a significant residual stress is present in weld due to complex nature of fixturing system compared to fusion welding. These residual stresses can affect properties of welded components during service. Therefore, for estimating magnitude of welding residual stresses and their nature of distribution along with thermal history, a three dimensional non-linear thermo-mechanical finite element (NLTMFE) model using ANSYS package was developed for butt welded aluminum alloy 2014-T6. Validity of NLTMFE model was established while observing close agreement of temperature history, residual stress patterns with that of experimental values.

199

Temperature distribution study in resistance spot welding












Ahmet Akkus



Cumhuriyet University, Engineering Faculty, Mechanical Engineering Department, Sivas, 58140, Turkey

This paper presents effect of sheet thickness and current density on cooling speed and temperature distribution in resistance spot welding. Thicker sheets have higher temperatures in weld zones. Temperatures are higher in sheets having various thicknesses under higher weld current. Weld current is more effective than material thickness on cooling rate and temperature distribution.

203

Effect of impeller-diffuser radial gap ratio in a centrifugal pump


Adnan Ozturk1, Kadir Aydin2, Besir Şahin2 & Ali Pinarbasi1*


1Cumhuriyet University, Engineering Faculty, Mechanical Engineering Department, Sivas, 58140, Turkey

2Cukurova University, Engineering Faculty, Mechanical Engineering Department, Adana, Turkey

In this study, effects of flow behavior in a non-traditional centrifugal pump, whose diffuser was subjected to different radial gaps, were investigated numerically using multi-purpose FLUENT code. Flow was assumed to be three dimensional, viscous and incompressible.  RNG with standard near-wall functions was used. Centrifugal pump had a five backward curved-bladed impeller running at 890 rpm and a nine vaned diffuser. Investigations for three different radial gaps (10%, 15%, 20%) have been carried out for 15 different volume flow rates. For present pump, 20% radial gap is found most suitable for pressure fluctuations.

214

Empirical approach for estimation of rock load in development workings of room and pillar mining




A Paul*, Ajoy Kumar Singh, Niraj Kumar &
D G Rao


Central Institute of Mining & Fuel Research, Barwa Road, Dhanbad 826 001, India

This study has developed relationship between rock loads of galleries and junctions in coalmines. Study was extended further to infer relation between CMRI RMR and rock load of galleries and junctions for formulation of optimum design of support system for stability of openings in Indian coalmines.

217

Spoil room utilization in dragline stripping




Bülent Erdem* and Tuğba Doğan


Department of Mining Engineering, Cumhuriyet University, 58140, Sivas, Turkey

This paper deals with spoil room utilization by two different spoil placement techniques. A three-dimensional computer-aided design approach for generating conical and curvilinear spoil piles are developed. Curvilinear spoil piles make better use of spoil room. When dragline and panel dimensions are closely matched, geometrical stability is reached after a few sets along the direction of advance.

229

Utilization of by-products of oil processing industries for PVC stabilizers




S D Toliwal* & Kalpen Patel


Department of Industrial Chemistry, Institute of Science and Technology for Advanced Studies and Research (ISTAR), Vallabh Vidyanagar
388 120, India

Epoxidised products from acid oil (AO) and oil recovered from spent bleaching earth (ORSBE) were prepared at 29°C using per acetic acid produced in situ by reacting H2O2 (30% v/v) with various amounts of glacial acetic acid. Ba, Cd, Pb and Zn soaps of epoxidised oils were prepared by metathesis in alcohol solution. Additives retarded dehydrochlorination rate of PVC and markedly reduced unsaturation level in degraded polymer. Chain scission has been found predominant reaction that accompanied dehydrochlorination. Additives reduced average number of chain scission per polymer molecule.

235

Inhibition of corrosion of mild steel by Phenyl thiosemicarbazides of nontraditional oils














S D Toliwal* & Kalpesh Jadav



Department of Industrial Chemistry, Institute of Science and Technology for Advanced Studies and Research (ISTAR), Vallabh Vidyanagar 388 120, India

Thiosemicarbazide of phenyl hydrazides of fatty acids from nontraditional oils (neem, rice bran and karanja) have been synthesized and evaluated as corrosion inhibitors for mild steel (MS) in hydrochloric acid (HCl) solution by weight loss method. Inhibition efficiency of these compounds increases with increase in concentration of the compound, and vary with solution temperature, immersion time and concentration of acid solution.

242

Characterization of thermo-tolerant and acid/alkali tolerant β-glucosidase from bacterial isolate M+

















Bijender K Bajaj*, Himani Pangotra,
Masood A Wani, Ajay Sharma & Priyanka Sharma



Department of Biotechnology, University of Jammu, Jammu 180 006, India

This study presents isolation and characterization of β-glucosidase (BG) from a bacterial isolate. Enzyme showed maximum activity at 50°C (2200 IU/l), however, relatively good activity (1600-1900 IU/l) was maintained even at higher temperature (60-80°C). Enzyme was thoroughly stable at 50-80°C for 30 min to 1 h and retained activity (75-100%), indicating its substantial thermo-tolerant nature. Maximum activity of BG was found at pH 6 (2200 IU/l), but significantly good activity was also observed at pH 5 (1800 IU/l), 7 (2000 IU/l), 8 (1900 IU/l) and 9 (1500 IU/l). Pb2+ caused considerable increase in enzyme activity (47%), while Zn2+ caused a little reduction (7%).

Energy and Environment

248

Influence of thermal insulation on conductive heat transfer through roof ceiling construction























B M Suman* & R K Srivastava



Central Building Research Institute, (CBRI), Roorkee 247 667, India

This study determines influence of thermal insulation on conductive heat transfer through roof-ceiling construction when thermal insulation material was integrated to roofing system. Among two pairs of two identical rooms, respective roofs were equipped with insulation to be tested as follows: i) polystyrene and its identical pair with no insulation; and ii) fiberglass, and its pair with no insulation material. Roof with no insulation was considered as reference. Roof with polystyrene performed better than fibreglass.

252

Optimization of organic loading rate for different fruit wastes during biomethanization











R D Kirtane1*, P C Suryawanshi1, M R Patil1,
A B Chaudhari2 & R M Kothari1

1
Jain Hi-Tech Agri Institute, Jain Irrigation Systems Ltd (JISL), Jalgaon 425 001, India

2School of Life Sciences, North Maharashtra University, Jalgaon 425 001, India

Anaerobic microbial digestibility of three substrates [pomegranate shells (PS), mango peels and kernel (MPK) and banana peels (BP)] has been evaluated as a function of organic loading rate and conversion to methane. A direct correlation appears between C:N ratio and % lignin, and C:N ratio and % digestibility, placing BP topmost, MPK in middle and PS at the end. Accordingly, optimized organic loading rate (OLR) is: PS, 1.5; MPK, 3.5; and BP, 3.5 kg VS/day/m3.

Book Review

256

Plywood Primer, Reviewed by Dr P D Tyagi

Author-Reader Platform

257

Instructions to contributors

 
 
 
 Author Index


Akkus A

199

Aydin K

203

 

 

Bajaj B K

242

Balusamy V

192

 

 

Chaudhari A B

252

 

 

Dhar D N

181

Doğan T

217

 

 

Erdem B

217

 

 

Garg R K

188

 

 

Jadav K

235

 

 

Kirtane R D

252

Kothari R M

252

Kumar N

214

Kumar S

181

 

 

Mittal S K

188

 

 

Ozturk A

203

 

 

Pangotra H

242

Patel K

229

Patil M R

252

Paul A

214

Pinarbasi A

203

 

 

Rajamanickam N

192

Rao D G

214

 

 

Şahin B

203

Saxena P N

181

Sharma A

242

Sharma P

242

Singh A K

214

Singh M

188

Srivastava R K

248

Suman B M

248

Suryawanshi P C

252

 

 

Thyla P R

192

Toliwal S D

229, 235

 

 

Vignesh G H

192

 

 

Wani M A

242


  Keyword Index


β-Glucosidase

242

 

 

Acid oil

229

Acid/alkali tolerant

242

Aluminum alloy 2014-T6

192

 

 

Biogas

252

Biological activities

181

Biomethanization

252

Bioreactor efficiency

252

 

 

Catalysts

181

Centrifugal pump

203

CFD

203

Characterization

242

Conical spoil pile

217

Corrosion inhibition

235

Curvilinear spoil pile

217

 

 

Dehydrochlorination

229

Dragline

217

 

 

Empirical approach

214

Epoxidised oils

229

 

 

Fiberglass

248

Finite element analysis

192

Friction stir welding

192

Fruit wastes

252

 

 

Geometrical stability

217

 

 

Impeller-diffuser interaction

203

 

 

Metal complexes

181

Metal soaps

229

Methane

252

Microcontroller-based instrument

188

Mild steel

235

 

 

Nontraditional oils

235

Numerical simulation

203

 

 

Oil recovered from spent bleaching earth (ORSBE)

229

Organic loading rate

252

 

 

Peracetic acid

229

Phenyl thiosemicarbazides

235

Polystyrene

248

Purification

242

PVC

229

 

 

Residual stress

192

Rock load

214

Room and pillar mining

214

 

 

Schiff bases

181

Sheet thickness

199

Snow density

188

Snow moisture

188

Spot welding

199

 

 

Temperature distribution

199

Thermal cycle

192

Thermal insulation

248

Thermo-tolerant

242