A Petri Net based approach to determine the disassembly strategy of a product

In order to protect the environment and regain value added to products, a process known as disassembly has come into the limelight. This process is to be applied to reuse abandoned goods and materials. Manufacturers are being forced to establish disassembly plants and to develop their products' designs so as to maintain the government's dictate to dispose off their products in an environmentally responsible manner. This research presents a cost-based heuristic analysis for a circuit board assembly. Various components of the product and their assembly relationships are represented by a Petri Net diagram. Firing the transitions of the disassembly Petri Net is integrated with cost-based indices to develop an effective disassembly strategy. The methodology discussed here simplifies the decisionmaking process involved in disassembly planning. A comprehensive disassembly process planning system is proposed here and is exemplified by a case study of circuit board assembly.     

Design and development of a machine vision system using artificial neural network-based algorithm for automated coal characterization

Coal is heterogeneous in nature,and thus the characterization of coal is essential before its use for a specific purpose.Thus,the current study aims to develop ...     

Polarographic Study of Thio-acetic Acid

The polarographic behaviour of thio-acetic acid (RSH) at dropping mercury electrode (d.m.e.) has been investigated in presence of KNO₃ in the pH range 2–10.5 at 30.0 ± 0.2°C in 50% alcoholic medium at 0.2 M ionic strength. Well defined anodic waves were obtained at all pH values in the concentration range studied. At pH < 2.2 and > 10.5 ill defined anodic waves were obtained. The effect of pH, concentration of RSH, temperature, drop time and alcohol on the wave characteristic and the mechanism of the reaction occurring at the surface of the mercury drop have been studied in detail. A small prewave was also observed at pH 9.1 and 10.5, which has been assigned adsorption characteristics. The reversibility of the reaction mechanism was confirmed by a number of methods. The wave is diffusion controlled and reversible involving one electron transfer process: Mathematical and experimental evidence shows that the anodic wave of RSH at. d.m.e. does not correspond to formation of (RSSR) but to a mercury compound RSHg according to the above equation. The diffusion coefficient and temperature coefficient for (30–45°C) of i_d at pH 4.0 and 9.1 have been found to be 1.698; 1.965 × 10⁻⁶ cm²/sec and 1.08%; 1.20% per degree respectively. The dissociation constant pKa was found to be 4.25 by the plot of E_1/2 vs. pH. The linearity of i_d with RSH concentrations provides a rapid and precise method for the determination of RSH down to 0.2 mM.     

Wave-induced flow of pore fluid in a cracked porous solid containing penny-shaped inclusions

An aim of current study is to analyze the contribution of reflected longitudinal waves to wave-induced fluid flow(WIFF)in the cracked porous solid.Initially,we ...     

A near-optimum detector with reduced out-of band response fornarrowband signals

Reduced spectral response in adjacent spectral bins is very desirable for detectors since it gives capability to detect narrowband signals in the presence of unknown interference and colored noise. Conventionally, this is achieved by applying a smoothing window on the signal at the cost of detection performance. In this correspondence, a new method of detecting narrowband signals that uses a close approximation to the matched filter and the extrapolated input signal is proposed. The filter used has a frequency response that is very closely equal to that of the matched filter within a Doppler bin and nearly zero response outside it     

Purification and identification of antioxidant peptide from black pomfret, <Emphasis Type=Italic>Parastromateus niger</Emphasis> (Bloch, 1975) viscera protein hydrolysate

To utilize fish waste, black pomfret, Parastromateus niger viscera was analysed for its proximate and amino acid composition followed by hydrolysis using various proteases to extract antioxidant peptide. Antioxidant activities of the crude hydrolysate was evaluated using DPPH (54%), metal chelating (78.6%) at a concentration of 1 mg/mL, whereas the reducing power assay was done with different concentration (0.5–2.5 mg/mL) and the activity also increased with increasing concentration (0.021–0.068). Furthermore, the hydrolysate was purified by diethylaminoethyl (DEAE) ion-exchange and Sephadex G-25 gel filtration chromatography. Finally, the purified peptide had a mass of 701.9 Da, and the amino acid sequence was identified as Ala-Met-Thr-Gly-Leu-Glu-Ala using electrospray ionization-tandem mass spectrometry (ESI-MS/MS). Moreover, the protection ability of the peptide toward hydroxyl radical-induced oxidative DNA damage and inhibiting lipid peroxidation was evaluated and compared with natural antioxidant α-tocopherol.