Total visitors:1,823 since 20-10-03

 

Journal of Scientific & Industrial Research

 

ISSN: 0022-4456

 

CODEN: JSIRAC (62) (11) 1047-1108 (2003)

VOLUME 62

NUMBER 11

NOVEMBER 2003

 

CONTENTS

Papers

1057

Indigenous development of gamma compensated boron lined neutron chambers



















Mary Alex, D N Prasad, K R Prasad,
S K Kataria, S N Athavale, A L Pappachan,  C Subramanian, A K Grover & A K Suri

g-compensated boron-lined ionisation chambers are indigenously developed for neutron monitoring applications in reactors using inexpensive and easily available polyether ether ketone (PEEK) insulating material as an alternative to alumina. The chamber has overall diam of 8.5cm and 31.5 cm length. 0.7g of indigenously developed 40.5 per cent enriched boron is dip coated on the electrodes. The chamber has neutron sensitivity of 5.5fA/nv and an average g compensation factor of 4 per cent. The performance of the neutron detector is compared with a similar detector with alumina discs. The use of suitably shaped PEEK inserts at the ends of the electrodes eliminates extra-cameral volume.

1063

Effect of calcination temperature on sensitivity of tin oxide thin film















 

 


Sunita Mishra, C Ghanshyam, Nathai Ram, Satinder Singh, R P Bajpai, K K Bhasin & R K Bedi

Describes the effect of calcination temperature on the gas sensitive properties of nanocrystalline tin oxide thin film. Nanocrystalline SnO2 thin films are prepared by sol-gel method using inorganic salt as a precursor material. Influence of calcination temperature is evaluated on the structural morphology and electrical characteristics of the film prepared by spin coating method. Scanning Electron Microscopy (SEM) reveals that with increasing calcination temperature the uniformity of the film increases. X-ray diffraction (XRD) measurements show that the grain size increases from ~20 to 80 nm as the calcination temperature is increased from 100 to 600C.

1067

Drying studies in annular circulating fluidized bed drier













 



P Sivashanmugam

The performance of the continuous annular circulating fluidized bed drier is studied by simulating the drying conditions in the continuous fluidized bed drier. A correlation relating particle Reynolds No. (Rep) to drying rate constant is proposed. The gap opening of 22mm with the Rep of 316 and the gap opening of 28 mm with the Rep of 316 and 336 are identified that are suitable for carrying out continuous drying.

1071

Biosorbent, Cupressus Female Cone in the efficient treatment of effluent containing Cr(VI)






























 


M Murugan & E Subramanian

Cupressus Female Cone (CFC), an inexpensive plant material is investigated as an adsorbent for the removal of Cr(VI) from synthetic solution as well as from industrial wastewater so as to help its safe disposal. Batch sorption studies are conducted systematically, involving various process parameters such as pH, agitation time, initial Cr(VI) concentration, particle size, and sorbent dosage. Maximum sorption occurs at the acidic pH range of 0.2-0.5 but it decreases on increasing the pH. Increase in initial concentration of Cr(VI) and sorbent particle size are found to reduce the amount of sorption, demonstrating the role of surface effects on sorption. When the temperature is raised the amount of sorption increases, exhibiting an endothermic nature. The sorption capacity is remarkably higher, amounting to 119.4 mg/g (91 per cent) at 30C and at a pH of 0.5; it further increases to 124.5 mg/g (99.6 per cent) at 50C. Sorption process follows first order kinetics and the data fit to the Langmuir sorption isotherm. Pore diffusion and mass transfer of Cr(VI) are significantly contributory to the sorption rate. Apparently, sorption is irreversible and possibly strong chemical interacting forces underlay in Cr(VI) uptake, as indicated by meager desorption with distilled water, sodium hydroxide, and EDTA. Column studies are also performed for Cr(VI) removal and the data fit to the Thomas model. It emerges that CFC is better than other biosorbents such as, Spirogyra species and wool reported recently.

1079

Characterization of yeasts for ethanolic fermentation of molasses with high sugar concentrations



















 




B K Bajaj, Vikas Taank & R L Thakur

Five yeast isolates obtained from molasses (1, and 3B) or jaggery (G1 and G2) and three Saccharomyces cerevisiae strains, S. cerevisiae MTCC 172, S. cerevisiae MTCC 174, and S. cerevisiae HAU-11 are examined for their ethanol production ability in molasses with high sugar concentrations and other desirable fermentation characteristics. Four strains, isolate 3B, S. cerevisiae HAU-11, S. cerevisiae MTCC 174 and S. cerevisiae MTCC 172, gave high efficiency of ethanol production, i.e. 71.0, 67.0, 66.7, and 61.5 per cent, respectively, in concentrated molasses (40 per cent sugars). Viability of the yeast strains is quite high in diluted molasses but decreases drastically with increase in concentration of sugars in the medium and also by prolonged incubation. The four superior strains (3B, S. cerevisiae MTCC 172, S. cerevisiae MTCC 174, and S. cerevisiae HAU-11) show viability between 57 to 71 per cent in molasses with sugar concentration of 35-40 per cent.

1086

Eco-friendly pest management using monoterpenoids III: Antibacterial efficacy of carvacrol derivatives



Vidya P Nikumbh, Vrushali S Tare &
Pramod P Mahulikar

Ether and ester derivatives of carvacrol, [2-methyl-5-(1-methyl ethyl) phenol], a natural phenolic monoterpenoids, are synthesized and evaluated   for   their   antibacterial   activity   against   B.   megaterium, B. japonicum, B. polymyxa and B. substilits to establish structure-activity relationships. In overall studies, carvacrol esters exhibit better antibacterial potency and efficacy than ethers. An introduction of aliphatic side chains with increasing methylene group and olefinic double bond reflects least effect on activity.

1090

Soybean (Glycine max L.) seed coat peroxidase immobilized on fibrous aromatic polyamide: A strategy for decreasing phenols from industrial wastewater












 


R N Gacche, Quraishi Firdaus & A D Sagar

Peroxidase enzyme extracted from soybean (Glycine max L.) seed coats and immobilized on fibrous aromatic polyamide are used for the detoxification of phenols from industrial wastewater. It is observed that during 5 h treatment with immobilized peroxidase the phenolic concentration is reduced from 0.720 to 0.063 mg/mL.

1094

Ferrous-ferric oxidation in pickle liquor



Rangadhar Nayak & J Rajagopala Rao

Oxidation of iron(II) to iron(III) is studied in the presence of different alkalies, using air as an oxidant. Different additives are added to see their effects on the rates of oxidation. Of the three systems studied the FeSO4-NaOH has the highest and the FeSO4-Na2CO3 has the lowest rates of oxidation, than that of FeSO4-Ca(OH)2 which lies inbetween.

Book Review

1098

         Understanding TRIPS managing knowledge in developing countries
      Reviewer: V K Gupta

Sci-Tech Update

1102

         Electrochemical biosensors for food and feeds analysis and control developed

 

         Dumping duty recommended on titanium dioxide

 

         Lillys new treatment for osteoporosis

 

         Thin clays developed

 

         Stem cells in the bone marrow become liver cells in response to an alarm

 

         Psoriasis and psoriatic arthritis treatment without side effects

 

         New treatment for psychological trauma

 

  AUTHOR INDEX
   
  KEYWORD INDEX

 


Author Index

Alex Mary

1057

Ghanshyam C

1063

Taank Vikas

1079

Prasad D N

1057

Nathai Ram

1063

Thakur R L

1079

Prasad K R

1057

Singh Satinder

1063

Nikumbh Vidya P

1086

Kataria S K

1057

Bajpai R P

1063

Tare Vrushali S

1086

Athavale S N

1057

Bhasin K K

1063

Mahulikar Pramod P

1086

Pappachan A L

1057

Bedi R K

1063

Gacche R N

1090

Subramanian C

1057

Sivashanmugam P

1067

Firdaus Quraishi

1090

Grover A K

1057

Murugan M

1071

Sagar A D

1090

Suri A K

1057

Subramanian E

1071

Nayak Rangadhar

1094

Mishra Sunita

1063

Bajaj B K

1079

Rajagopala Rao J

1094

 
KEYWORD INDEX

Boron line neutron chambers

1057

Chromium (VI) disposal

1071

Monoterpenoids

1086

Neutron chambers

1057

Cupressus female cone

1071

Antibacterial efficacy

1086

Gamma compensated boron lined neutron chambers

1057

Biosorption

1071

Carvacrol derivatives

1086

Tin oxide

1063

Effluent

1071

G. max seed coat peroxidase

1090

Sensitivity

1063

Yeast

1079

Aromatic polyamide

1090

Grain size

1063

Ethanol fermentation

1079

Wastewater

1090

Nanocrystalline

1063

Molasses

1079

Phenols

1090

Sol-gel

1063

Ethanol tolerance

1079

Iron (II)

1094

Calcination temperature

1063

Flocculence

1079

Iron (III)

1094

Annular circulating fluidized bed drier

1067

Adaptability

1079

Alkalis

1094

Fluidized bed drier

1067

Eco-friendly pest management

1086

Aerial oxidation

1094

Fluidized bed drying process

1067

Pest management

1086

Additives

1094

 

 

 

 

Pickle liquor

1094