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671.

FTIR and thermal studies on esters grafted HDPE Pages 135-144 Download PDF

Authors: Vellaichamy Parthasarathy, Viswalingam Dhanalakshm, Ramasamy Anbarasan

Keywords: Functionalization, Crosslinking, DSC, FTIR, Grafting, HDPE, TGA

Abstract:

HDPE was functionalized with two different esters in an inert atmosphere at 160°C, under different experimental conditions by thermolysis method. The order of the functionalization and crosslinking reactions was determined. The C=C formation peak is assigned at 1610 cm-1.The percentage of functionalization was determined by FTIR spectroscopy method. Thermogravimetric analysis and differential scanning calorimetric methods were also used to study about the thermal properties of the functionalized HDPE.

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672.

Selection of materials using multi-criteria decision-making methods with minimum data Pages 135-148 Download PDF

Authors: Shankar Chakraborty, Prasenjit Chatterjee

DOI: 10.5267/j.dsl.2013.03.005

Keywords: Correlation matrix, ELECTRE, Material selection, TOPSIS, VIKOR

Abstract:

Selection of material for a specific engineering component, which plays a significant role in its design and proper functioning, is often treated as a multi-criteria decision-making (MCDM) problem where the most suitable material is to be chosen based on a given set of conflicting criteria. For solving these MCDM problems, the designers do not generally know what should be the optimal number of criteria required for arriving at the best decisive action. Those criteria should be independent to each other and their number should usually limit to seven plus or minus two. In this paper, five material selection problems are solved using three common MCDM techniques to demonstrate the effect of number of criteria on the final rankings of the material alternatives. It is interesting to observe that the choices of the best suited materials solely depend on the criterion having the maximum priority value. It is also found that among the three MCDM methods, the ranking performance of VIKOR (Vlse Kriterijumska Optimizacija Kompromisno Resenje) method is the best.

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673.

Ultrasound assisted synthesis of enaminones using Nickel oxide Pages 145-152 Download PDF

Authors: Suresh S. Shendage, Jayashree M. Nagarkar

Keywords: B-enamino esters, B-enaminones, Heterogeneous catalysis, NiO, Ultrasound

Abstract:

An efficient and simple protocol of B-enaminones and B-enamino esters synthesis using nickel oxide under ultrasound sonication has been developed. Ultrasound sonication triggers the formation of enaminones under the mild reaction conditions. Nickel oxide was found to be efficient, heterogeneous, moisture stable, robust and recyclable catalyst.

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674.

Implementation of 5S practices: A review Pages 155-162 Download PDF

Authors: Jagtar Singh, Vikas Rastogi, Richa Sharma

Keywords: 5S, Availability, Efficiency, Housekeeping, Total Productive Maintenance, Total Quality Management

Abstract:

5S is a systematic technique used by organizations come from five Japanese words; Seiri (Sort), Seiton (Set in order), Seiso (Shine), Seiketsu(standardize) and Shitsuke (sustain). This system helps to organize a workplace for efficiency and decrease non value added activities and optimize quality and productivity through monitoring an organized environment. This paper aims to review previous studies about benefits of 5S Implementation and its efficiency in organizations. The results show that 5S is an effective tool for improvement of organizational performance, regardless of organization type, size, its production or its service. Consequently, 5S technique would strongly support the objectives of organization to achieve continuous improvement in performance and productivity.

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675.

Exchange rate volatility and export growth in India: An ARDL bounds testing approach Pages 191-202 Download PDF

Authors: P. Srinivasan, M. Kalaivani

DOI: 10.5267/j.dsl.2013.04.002

Keywords: ARDL-UECM, Cointegration, CUSUM, CUSUMQ, Exchange rate volatility, India, Real exports

Abstract:

This paper empirically investigates the impact of exchange rate volatility on the real exports in India using the ARDL bounds testing procedure proposed by Pesaran et al. (2001). Using annual time series data, the empirical analyses has been carried out for the period 1970 to 2011. The study results confirm that real exports are cointegrated with exchange rate volatility, real exchange rate, gross domestic product and foreign economic activity. Our findings indicate that the exchange rate volatility has significant negative impact on real exports both in the short-run and long-run, implying that higher exchange rate fluctuation tends to reduce real exports in India. Besides, the real exchange rate has negative short-run and positive long-run effects on real exports. The empirical results reveal that GDP has a positive and significant impact on India’s real exports in the long-run, but the impact turns out to be insignificant in the short-run. In addition, the foreign economic activity exerts significant negative and positive impact on real exports in the short-run and long-run, respectively.

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676.

Non-Destructive testing based method for crack detection in beams Pages 193-200 Download PDF

Authors: Akash Vardhan, Amanpreet Singh

Keywords: Axial vibration, Crack location, Crack size, Modal frequencies, Non-destructive testing, Stiffness

Abstract:

Beams are the constituent elements of several machine parts and sophisticated structures. In this paper, efforts are made to develop suitable methods that can serve as the basis to detect crack location and to crack size from measured axial vibration data. This method is used to address the inverse problem of assessing the crack location and crack size in various beam structure. The method is based on measurement of axial natural frequencies, which are global parameter and can be easily measured from any point on the structure. In theoretical analysis, the relationship between the natural frequencies, crack location, and crack size has been developed. For identification of crack location and crack size, it was shown that data on the variation of the first two natural frequencies is sufficient. The experimental analysis is done to verify the practical applicability of the theoretical method developed.

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677.

Evaluation of performance metrics of leagile supply chain through fuzzy MCDM Pages 211-222 Download PDF

Authors: D. Venkata Ramana, K. Narayana Rao, J. Suresh Kumar

DOI: 10.5267/j.dsl.2013.03.003

Keywords: Triangle fuzzy weights, Confirmatory factor analysis, Leagile supply chain

Abstract:

Leagile supply chain management has emerged as a proactive approach for improving business value of companies. The companies that face volatile and unpredictable market demand of their products must pioneer in leagile supply chain strategy for competition and various demands of customers. There are literally many approaches for performance metrics of supply chain in general, yet little investigation has identified the reliability and validity of such approaches particularly in leagile supply chains. This study examines the consistency approaches by confirmatory factor analysis that determines the adoption of performance dimensions. The prioritization of performance enablers under these dimensions of leagile supply chain in small and medium enterprises are determined through fuzzy logarithmic least square method (LLSM). The study developed a generic hierarchy model for decision-makers who can prioritize the supply chain metrics under performance dimensions of leagile supply chain.

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678.

Free vibration analysis of moderately thick functionally graded skew plates Pages 229-238 Download PDF

Authors: Jyoti Vimal, R K Srivastava, A D Bhatt, Avadesh K Sharma

Keywords: Free vibration, Functionally graded materials, Skew plates

Abstract:

Finite element method is used to study the free vibration analysis of functionally graded skew plates. The material properties of the skew plates are assumed to vary continuously through their thickness according to a power-law distribution of the volume fractions of the plate constituents. The first order shear deformation theory is used to incorporate the effects of transverse shear deformation and rotary inertia. Convergence study with respect to the number of nodes has been carried out and the results are compared with those from past investigations available in the literature. Two types of functionally graded skew plates - Al/ZrO2 and Al/Al2O3 are considered in this study and the effects of the volume fraction, different external boundary conditions and thickness ratio on the natural frequencies are studied in detail.

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679.

Simultaneous optimization of material removal rate and surface roughness for WEDM of WC-Co composite using grey relational analysis along with Taguchi method Pages 479-490 Download PDF

Authors: Kamal Jangra, Sandeep Grover, Aman Aggarwal

DOI: 10.5267/j.ijiec.2011.04.005

Keywords: Grey relational analysis, Taguchi method, Tungsten carbide composite, Wire electrical discharge

Abstract:

In this paper, wire electrical discharge machining of WC-Co composite is studied. Influence of taper angle, peak current, pulse-on time, pulse-off time, wire tension and dielectric flow rate are investigated for material removal rate (MRR) and surface roughness (SR) during intricate machining of a carbide block. In order to optimize MRR and SR simultaneously, grey relational analysis (GRA) is employed along with Taguchi method. Through GRA, grey relational grade is used as a performance index to determine the optimal setting of process parameters for multiple machining characteristics. Analysis of variance (ANOVA) shows that the taper angle and pulse-on time are the most significant parameters affecting the multiple machining characteristics. Confirmatory results, proves the potential of GRA to optimize process parameters successfully for multi-machining characteristics.

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680.

Optimal ordering and pricing policy for price sensitive stock–dependent demand under progressive payment scheme Pages 523-532 Download PDF

Authors: Nita H. Shah, Amisha R. Patel, Kuo-Ren Lou

DOI: 10.5267/j.ijiec.2011.03.005

Keywords: Deterioration, Inventory, Price-sensitive stock-dependent demand

Abstract:

The terminal condition of inventory level to be zero at the end of the cycle time adopted by Soni and Shah (2008, 2009) is not viable when demand is stock-dependent. To rectify this assumption, we extend their model for (1) an ending – inventory to be non-zero; (2) limited floor space; (3) a profit maximization model; (4) selling price to be a decision variable, and (5) units in inventory deteriorate at a constant rate. The algorithm is developed to search for the optimal decision policy. The working of the proposed model is supported with a numerical example. Sensitivity analysis is carried out to investigate critical parameters.

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