Energy efficient quaternary capacitive DAC switching scheme using sar analog to digital converter

Abstract This article shows the outline of successive approximation register-ADC used to convert the signals obtain from the brain into electrical signal. Quaternary capacitive exchangin vitality conspires (QCS) within the execution of (C-DAC) is utilized which makes the vitality utilization in the C-DAC free of the yield advanced output code. This method accomplishes a 50% diminishment within the normal vitality utilization. The design is actualized in 0.25nm technologyusing complementary metal-oxide semiconductor (CMOS).</jats:p

Optimization of Stir-Squeeze Casting Parameters to Analyze the Mechanical Properties of Al7475/B4C/Al2O3/TiB2 Hybrid Composites by the Taguchi Method

Stir-squeeze casting (SSC) is the appropriate and inexpensive technique for producing aluminum hybrid matrix composites as it creates a uniform distribution of reinforcements in the composite with finer grains. Al7475 is a lightweight castable alloy that possesses enough hardness and strength with applications in automotive and aerospace. This research work examines the effect of process parameters for Al7475/Al2O3/B4C/TiB2 hybrid matrix composites produced by the stir-squeeze casting methodology. As per Taguchi design L16, four parameters with four levels were selected in the optimization process of SSC are stir speed (SD) of 300-450 rpm, melting temperature (ME) of 750–900°C, squeeze pressure (SE) of 50-125 MPa, and reinforcement (RT) of 2-8 wt%. The mechanical properties such as tensile strength (TS) and hardness (HN) are studied by the variation of each process parameters levels. The optimization results on TS and HN are predicted by Minitab-17 Software. It is observed that maximum TS of 325 MPa and HN of 130.6 Hv are attained at experiments L1 and L7, respectively. From the SN ratio result, the TS value is improved at the parameter level of RT2-SE4-ME2-SD4. The ANOVA result exposed that reinforcement is the most significant factor for enhancing tensile strength which contributes 38.9%, followed by squeeze pressure of 28.4%, stir speed of 13.6%, and melting temperature of 12.16%

Multi-Objective Optimization of Thermo-Ecological Criteria-Based Performance Parameters of Reheat and Regenerative Braysson Cycle

Abstract The reheat and regenerative Braysson cycle being an alternative for combined cycle power plants needs to be optimized for its efficient utilization of energy resources. Therefore, to obtain the best possible overall pressure ratio, regenerator effectiveness, and pressure ratio across multistage compression in order to simultaneously maximize exergy efficiency, nondimensional power density (NDPD), and ecological coefficient of performance (ECOP) for three different maximum temperature situations, multi-objective optimization of the above cycle is carried out using nondominated sorting genetic algorithm-II (NSGA-II). The optimal solutions given by the Pareto frontier are further assessed through widely used decision makers namely LINMAP, TOPSIS, and Bellman–Zadeh techniques. The optimal solutions attained by the decision-making process are further evaluated for their deviation from the nonideal and ideal solutions. The optimal solution obtained through TOPSIS possesses the minimum deviation index. Finally, the results are authenticated by performing an error analysis. Such optimal scenarios achieved for the three maximum temperatures are further analysed to achieve the final objective of the most optimal solution which happens to be at 1200 K. The simultaneous optimization of performance parameters which reflect the thermo-ecological criteria to be satisfied by a power plant has resulted in values of 0.479, 0.327, and 0.922 for exergy efficiency, nondimensional power density, and ecological coefficient of performance, respectively. These optimized performance parameters are obtained for an overall pressure ratio of 7.5, regenerator effectiveness of 0.947, and pressure ratio across multistage compression of 1.311.</jats:p

Effect of Tool Profile Influence in Dissimilar Friction Stir Welding of Aluminium Alloys (AA5083 and AA7068)

Friction stir welding is an innovative welding process for similar and dissimilar joining of the materials effectively. FSW simply modified the grain structure and also improved the strength of the joints for any type of alloying elements. This experimental study planned to carry out the joining process for dissimilar materials such as aluminium alloys 5083 and 7068. Three different types of tools are involved to find the ultimate tensile strength and Vickers hardness. The tool types are straight cylindrical tool, taper cylindrical tool, and triangular tool. The process factors for this investigation are a rotational speed of 800, 1000, 1200, and 1400 rpm, welding speed of 30, 40, 50, and 60 mm/min, axial force of 3, 4, 5, and 6 kN, and plate thickness of 5, 6, 7, and 8 mm. The hardness value and the ultimate tensile strength were increased in the welding zone, which proves the effects of tool profiles are efficiently utilized

Effect of Tool Profile Influence in Dissimilar Friction Stir Welding of Aluminium Alloys (AA5083 and AA7068)

Friction stir welding is an innovative welding process for similar and dissimilar joining of the materials effectively. FSW simply modified the grain structure and also improved the strength of the joints for any type of alloying elements. This experimental study planned to carry out the joining process for dissimilar materials such as aluminium alloys 5083 and 7068. Three different types of tools are involved to find the ultimate tensile strength and Vickers hardness. The tool types are straight cylindrical tool, taper cylindrical tool, and triangular tool. The process factors for this investigation are a rotational speed of 800, 1000, 1200, and 1400 rpm, welding speed of 30, 40, 50, and 60 mm/min, axial force of 3, 4, 5, and 6 kN, and plate thickness of 5, 6, 7, and 8 mm. The hardness value and the ultimate tensile strength were increased in the welding zone, which proves the effects of tool profiles are efficiently utilized.</jats:p

Manihot esculenta tuber microcrystalline cellulose and woven bamboo fiber-reinforced unsaturated polyester composites: mechanical, hydrophobic and wear behavior

In this research Manihot esculenta (cassava) tuber stem microcrystalline cellulose (MCC) and woven bamboo fiber (WBF) reinforced unsaturated polyester (UP) composites are prepared and tested. The main aim of this study was to synthesis the microcrystalline cellulose from Manihot esculenta tuber stem and investigate the mechanical, wear and hydrophobic properties of UP resin composite made using MCC and WBF. The laminated composites were prepared by the hand layup method and characterized according to ASTM standards. According to the results, the composite containing 40 vol% of WBF increased the tensile strength and modulus, flexural strength and modulus, interlaminar shear strength, Izod impact as well as hardness by 39%, 10%, 42%, 27%, 1%, 91%, and 1%, respectively as compare to pure polyester resin composites. In comparison to all composites, the composite with 4 vol% of MCC exhibits the lowest sp. wear rate of 0.011 mm ^3 /Nm. The water absorption contact angle indicated that all composite designations had a wider contact angle of more than 70°, which indicates a stronger hydrophobicity of composites. The SEM fractography reveals improved bonding and toughness for 4 vol% of MCC and WBF reinforced UP composites. Such mechanically stronger, wear resistance, as well as high hydrophobic composites, could be used in aerospace, automobile, defence and industrial sector