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G. Suresh,M. R. Ramesh,M. S. Srinath 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
This paper reports on a study of the high-temperature tribological performance of self-lubricating nickel-based compositeclad. A porous and crack free clad containing matrix, reinforcement, and lubricant phase is developed on titanium 31 alloyusing microwave irradiation. The microstructure of both NiCrSiB/WC and NiCrSiB/WC/Ag/BaF2 clad revealed very goodmetallurgical bonding with the substrate. The average microhardness of NiCrSiB/WC and NiCrSiB/WC/Ag/BaF2 clad is710.58 HV and 650.25 HV respectively, is comparatively higher than the titanium 31 substrate (320 HV). The addition of Agand BaF2solid lubricants in the clad endowing clad to operate at a broad temperature range. Compared with the NiCrSiB/WCclad, solid lubricant encapsulate clad has shown very low friction coefficient and wear rates. The sliding wear characteristicsof the clad were investigated by varying load and temperatures. The results revealed that oxide phases (NiO and Cr3O)andlubricant phases (Ag and BaWO4)formed at low and high temperatures are adequate to reduce delamination and material loss.
Suresh Sripada,D. Esther Kalpana Rani,G. Upender,P. Gayathri Pavani 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.5
Titanium boro tellurite glasses in the xB<sub>2</sub>O<sub>3</sub>−(90−x) TeO<sub>2</sub> + 10TiO<sub>2</sub> (where x = 0 to 50 mol%) system were prepared by using the conventional melt-quenching technique. Glass transition temperatures were measured with differential scanning calorimetry (DSC) and found to be in the range of 300 - 370 ℃. The Raman spectra showed a cleavage of the continuous TeO<sub>4</sub> (tbp) network by breaking of the Te-O-Te linkages. The relative transition of TeO<sub>4</sub> − groups to TeO<sub>3</sub> − groups is accompanied by a change in the oxygen coordination of the boron from 3 to 4 (BO<sub>3</sub> <sup>−</sup> to BO<sub>4</sub> <sup>−</sup>). The impedance plots Z▼(┺) versus Z▽(┺) for all the glass samples were recorded and found to exhibit a single circle. The AC conductivity of all glass samples was studied in the frequency range from 100 Hz to 1 MHz and in the temperature range from room temperature (RT) to 375 ℃. The AC conductivity decreased by about one order in magnitude with increasing B<sub>2</sub>O<sub>3</sub> content. The conductivity was found to be on the order of 10<sup>−4.5</sup> to 10<sup>−6</sup> (┯-cm)<sup>−1</sup> at 375 → and 1 MHz for 10 mol% and 50 mol% B<sup>2</sup>O<sup>3</sup> contents, respectively. The relaxation behavior in these glass samples is discussed based on the complex modulus and impedance data.
Suresh Alapati,제우성,서용권 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.5
The main objective of this work is to explore the effect of defect location on the swimming speed of a microscopic artificial swimmer. The swimmer consists of an artificial filament composed of super-paramagnetic beads connected by elastic linkers and is modeled with aworm-like-chain configuration. To simulate the swimming motion of the filament, a load particle is attached at one end of the filament. The Rotne-Prager approximation is used to evaluate the hydrodynamic interactions between the filament and the fluid. To validate thenumerical code, we first simulated the swimming motion of the filament without defect (‘without defect’ means the bending stiffness ofthe filament is uniform along its length). Next, we simulated the swimming motion of defective filament by setting zero for the bendingstiffness value at a particular bead location. We observed that when the location of defect is on the load side of the filament, the swimmingvelocity is less than that of the defect-less filament, and vice versa. The effect of defect is more significant when it is located on theload side of the filament (The difference between the swimming velocity of defective and defect-less filament amounts to 38%) thanwhen it is on the free end side (The difference is only 7% ). We also observed that at a certain sperm number the swimming direction isreversed when the defect is located very close to the load particle.
Suresh, A.,Choi, Hong L.,Zhukun, Zhukun Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.5
Pig slurry is a good soil amendment not only because of its high organic matter content, but also because of its ability to provide various nutrients. The objective of this study was to estimate the influence of raw and processed pig slurry application on pot soil over chemical fertilizer and non-amended control soil. Change in the chemical parameters (pH, organic matter (OM), organic carbon (OC), macro and micronutrients) and microbial mass of the treated soils were monitored over 30 to 90 days. Pot soil was treated with the recommended dose of pig slurry and chemical fertilizer, and was sampled after 30, 60 and 90 days of incubation. The least significanct difference (p<0.05) was observed on Fe, Cu, Zn, available P and K between treatments. All treatments increased N, P and K content and microbial mass of soil over control soil. Interestingly, no significant effects were detected on OM, OC, total bacteria, actinomycetes and fungi mass in soil irrespective of treatments given. However fungal and bacterial counts, as well as available nutrients, were found to be higher in processed slurry (PS)-treated soil compared to other soils. In general a significant correlation existed between the fungal count and OM, OC, Zn, T Kjeldahl N (TKN), available P and K of soil. A strong negative correlation was observed between pH and Fe in soil. This study clearly demonstrated that the use of processed manure as a fertilizer could be a key for sustainable livestock agriculture.
A JITTER FREE ALL DIGITAL PHASE LOCKED LOOP
Suresh,Maya,Mourad,Samiha 대한전자공학회 1995 ICVC : International Conference on VLSI and CAD Vol.4 No.1
A digital Phase Locked Loop (PLL) is easier to implement, has good dynamic range, initializes quickly and has higher noise immunity compared to an analog PLL However, a digital PLL usually has high jitter. This paper describes the design of a fitter free digital PLL that has been prototyped in an ACTEL FPGA. The digital PLL consists of a phase detector, a loop filter and a digital controlled oscillator. The phase detector produces an output proportional to the phase difference between the output clock and the incoming clock The output of the loop filter counter is compared to that of the digital controlled oscillator (DCO) The DCO produces the output signal which is aligned to the incoming frequency signal. The frequency range is 0.25 MHz to 15 MHz and the lock frequency range is ± 20 KHz
Parallel computation of two-phase flow in a microchannel using the lattice Boltzmann method
Suresh Alapati,강상모,Yong Kweon Suh 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.9
We present a numerical simulation of two-phase flow in a three-dimensional cross-junction microchannel by using the lattice Boltzmann method (LBM). At first, we validated our LBM code with the velocity profile in a 3-dimensional rectangular channel. Then, we developed a lattice Boltzmann code based on the free energy model to simulate the immiscible binary fluid flow. The parallelization of the developed code is implemented on a PC cluster using the MPI program. The numerical results of two-phase flow in the microchannel reveal droplet formation process, which compares well with corresponding experimental results. The size of droplet decreases with increase of the flow-rate ratio and the capillary number. The movement of a droplet through the microchannel induces three-dimensional circulating flow inside the droplet. This complex flow is thought to enhance the mixing and reaction of reagents.
Suresh, S.,Huang, H.,Kim, H.J. Elsevier Science, B.V 2014 Applied soft computing Vol.24 No.-
Data partitioning and scheduling is one the important issues in minimizing the processing time for parallel and distributed computing system. We consider a single-level tree architecture of the system and the case of affine communication model, for a general m processor system with n rounds of load distribution. For this case, there exists an optimal activation order, optimal number of processors m* (m*@?m), and optimal rounds of load distribution n* (n*@?n), such that the processing time of the entire processing load is a minimum. This is a difficult optimization problem because for a given activation order, we have to first identify the processors that are participating (in the computation process) in every round of load distribution and then obtain the load fractions assigned to them, and the processing time. Hence, in this paper, we propose a real-coded genetic algorithm (RCGA) to solve the optimal activation order, optimal number of processors m* (m*@?m), and optimal rounds of load distribution n* (n*@?n), such that the processing time of the entire processing load is a minimum. RCGA employs a modified crossover and mutation operators such that the operators always produce a valid solution. Also, we propose different population initialization schemes to improve the convergence. Finally, we present a comparative study with simple real-coded genetic algorithm and particle swarm optimization to highlight the advantage of the proposed algorithm. The results clearly indicate the effectiveness of the proposed real-coded genetic algorithm.