Journal of Scientific & Industrial Research

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VOLUME 67

NUMBER 4

APRIL 2008

CONTENTS

Management & Information Technology

267

Maintainability analysis of mechanical systems of electric cable shovels







Serm Uzgoren &
in Elevli, NevinMehmet Taksuk

Present study determines maintainability of mechanical systems of electric cable shovels utilized in Garp Linyitleri Isletmesi (GLI). Independent and identically distributed data are identified using tests for trends and serial correlation in order to represent the repair time data probabilistically. Three probability distributions are tried as possible candidates to fit Time To Repair (TTR) data. Finally, maintainability for different time periods and Mean Time To Repair (MTTR) values of shovels have been estimated on the basis of fitted distribution models. 

272

Entrepreneurial research model, CIC marGUNE: A case study
















X Maidagan, L N López de Lacalle,
J A Sánchez, A Lamikiz, E Maidagan &
S Cabanes

This paper presents an entrepreneurial research model, CIC marGUNE. Technological research agencies and universities work with Basque industries in CIC marGUNE under sponsorship of local government for developing and refining contemporary industrial manufacturing processes. Proposed paradigms and functional structure will benefit other developing regions of similar size, population and industrial economy.

 

277

Simulation modeling and analysis of single line multi stage manufacturing system








N Selvaraj

Present study compares performance of proposed model [Hybrid Extended Kanban Control System (HEKCS)], with Extended Kanban Control System (EKCS) and Constant Work In Process (CONWIP) in a single line and multi stage manufacturing system with or without effect of machine breakdown. It was observed that, when demand rate increases, throughput, average WIP and utilization% also gradually increases for all three-control mechanisms. When manufacturing system is operated with or without machine breakdown, HEKCS shows better performance than EKCS and CONWIP.

 

S & T and Industrial Research

282

Evaluation of machining parameters for turning of AISI 304 austenitic stainless steel on auto sharpening machine














R W Lanjewar, P Saha, U Datta, A J Banerjee, S Jain & S Sen

This study evaluates optimum machining parameters like tool geometry, tool materials, single or double tithed machining process, feed and cutting speed for minimum vibrations and cutting forces for turning AISI 304 austenitic stainless steel on autosharpening machine. Taguchi’s parameter optimization method is used to evaluate best possible combination for minimum cutting force and minimum vibrations during machining.

288

Effect of frequency and amplitude of FES pulses on muscle fatigue during toning of muscles 




Neelesh Kumar,V K Sharma, R C Agnihotri, Dinesh Pankaj Rohit Jindal, Deepak Mehta &
Raj Bhadur

This study presents effects of frequency and amplitude of stimulation pulses on muscle contraction. The experiments are on a complete paraplegic patient with injury level between T4 and T5. Number of contraction episode before fatigue has been more for low frequency and low voltage stimulation.

291

Human Stones: Dissolution of calcium phosphate and cholesterol by edible plant extracts and bile acids























Ishwar Das & Smriti Verma

Tri-calcium phosphate (TCP) and cholesterol are major constituents of human stones. Dissolution of TCP in extracts of kulfa (Portulaca oleracea), pathari (Trianthema monogyna), tomato (Lycopersicon esculantum) and grape (Vitis vinifera) has been studied by monitoring Ca content in the filtrate by flame photometer. Grape extract is found to be most effective for dissolution of TCP amongst other extracts studied. All these extracts contain carbohydrate, which interacts with Ca to form a soluble complex. Dissolution of cholesterol has been studied in extracts of kulfa, pathari, tomato and grape and in alcoholic solutions of ursodeoxycholic acid (UDCA) and chenodeoxycholic acid (CDCA). In dissolved portion, cholesterol was estimated by measuring optical density at λmax = 402 nm using UV-visible spectrophotometer. Amongst all these extracts, tomato is found to be most effective for dissolution of cholesterol. UDCA is found to be more effective in dissolving cholesterol than CDCA.

 

S & T and Industrial Research

295

Kinetic studies on acid catalysed hydrolysis of starch
























Barnali Bej, R K Basu & S N Ash

Acid hydrolysis of wheat flour (particle size, 4 µm) was carried out in a batch reactor between 75-95°C at varying acid concentrations (pH 2-5). Maximum (42%) conversion of starch to reducing sugar was obtained at 95°C and pH 3. Reaction follows First-order rate equation with respect to starch concentration and dependence of reaction rate constant on pH is incorporated. Activation energy () and frequency factor () of reaction were 7806 and 6.583×106 [1/] respectively. Time dependent conversion was observed with variation of temperature, pH and initial starch concentration within relative error of 19%.

299

Fabrication of Pt based amperometric cholesterol biosensor using cellulose acetate membrane


























Vikas & C S Pundir

Cholesterol esterase, cholesterol oxidase and horseradish peroxidase (HRP) have been co-immobilized onto cellulose acetate membrane, which is mounted over biosensor, Pt electrode. Biosensor showes excellent performance with a linear response between 2.5 to 50 mg dl-1 of cholesterol acetate [correlation coefficient (r) = 0.9912]. Mean analytical recovery of added cholesteryl acetate (100 and 200 mg dl-1) in serum (n=6.0) has been found to be 99.86±0.78 and 97.79±0.73. Cholesterol content of sera within batch and between batch coefficient of variation (CV) are <3% and < 5 %, respectively. Km for cholesterol acetate and Vmax are 1083 mg/dl-1 and 0.5 mA/sec. Optimum pH of biosensor is 7.0 and temperature 45°C. Enzyme electrode lost 50% of its activity during its regular use for 150 times over a period of 25 days at 4°C. The response time is 35 second. Uric acid and ascorbic acid shows slight interference.

 

S & T and Industrial Research

307

Multigrade bitumen verses conventional bitumen

























M C Jain, R S Negi, A Krishna & B R Tyagi

To evaluate field performance at hot and cold climatic regions, test tracks were laid using multigrade bitumen (MB) and conventional bitumen (CB) following 2 cm thick premix carpet, mix seal surfacing, semi-dense bituminous concrete and dense bituminous concrete road specifications at hot climatic region of Jaisalmer (Rajasthan) in May 2006 and cold climatic region of Drass, Kargil (J&K) in September 2005. Laboratory test results indicate that MB (softer grade) behaves better than bitumen 80/100 at low temperatures and better/comparable with bitumen 60/70 at high temperatures. MB has been characterized for conventional, mechanical properties and Strategic Highway Research Programme (SHRP) protocol. Field trial indicates that performance of MB is superior to CB in both cold and hot climatic regions.

Waste Treatment and Utilization

314

Formaldehyde–free sticklac and arhar stick composite board























K P Sao, S K Pandey & B Baboo

Sticklac has been used as a binding material to prepare formaldehyde-free composite board from arhar (Cajanus cajan) stick agro waste. Effects of sticklac obtained from kusmi and rangeeni strain, binder content, press-cycle, particle type, moisture content, density of board and wax emulsion as additive are studied on physical and mechanical properties of board. Tests of modulus of rupture, tensile strength perpendicular to surface of board, screw withdrawal force, water absorption and thickness swelling have indicated that composite board prepared using sticklac in alcoholic solution can meet required standard for interior grade with regard to above properties.

Waste Treatment and Utilization

319

A study on polyethylene microencapsulation of textile sludge

























R Jeevitha Raji & S Kanmani

An attempt has been made to encapsulate heavy metals and dyes present in textile sludge using low density polyethylene (LDPE) and assess usability of encapsulated product for building construction. Sludge samples were encapsulated into LDPE with calcium oxide (additive) at four different proportions (35, 40, 50 and 60 %) of sludge. Encapsulated cubes were formed and then tested for compressive strength. Maximum compressive strength of cubes (size, 7.06 cm) containing sludge (50%) for sample 1 (21.07 N/mm2) and sample 2 (17.55 N/mm2) was more than that of standard M15 mortar cubes. Encapsulated product could be recommended for use in the construction of non-load bearing walls. TCLP study revealed that leaching of dyes and heavy metals (Cu, Ni, Pb and Cr) has been effectively reduced after encapsulation process.

Author-Reader Platform

324

Instructions to contributors

 

Author Index

 




Keyword Index