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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.
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
Suresh Baral,Kyung Chun Kim 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This paper presents the thermodynamic analysis on selecting of working fluids for solar?based organic Rankine cycle (ORC) system for electricity generation. The working fluids for selections are categorized on the basis of nature of the thermo-physical behavior of the fluids that changes its property when subjected to various ranges of heat source temperature. The heat source temperature is obtained from renewable energy (solar energy) by the use of solar collectors. The potential efficiencies (Exergy, thermal and solar), mass flow rate, solar heat input, net power output and solar collector area are simulated.
Suresh Alapati,제우성,Madhusoodanan Mannoor,Yong Kweon Suh 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.11
In this paper, we present the results obtained from the simulation of particle motion induced by the fluid flow driven by an array of beating artificial cilia inside a micro-channel. A worm-like-chain model is used to simulate the elastic cilia, and the lattice Boltzmann equation is used to compute the fluid flow. We employ a harmonic force at the extreme tip of each cilium to actuate it. Our simulation methods are first validated by applying them to the motion of a single cilium and a freely falling sphere. After validation, we simulate the fluid flow generated by an array of beating cilia and find that a maximum flow rate is achieved at an optimum sperm number. Next, we simulate the motion of a neutrally buoyant spherical particle at this optimum sperm number by tracking the particle motion with a smoothed profile method. We address the effect of the following parameters on the particle velocity: the gap between cilia and particle, the particle size, the cilia density, and the presence of an array of intermediate particles.
Diverse roles of the scaffolding protein RanBPM
Suresh, B.,Ramakrishna, S.,Baek, K.H. Elsevier Science Ltd ; Distributed by Virgin Maili 2012 Drug Discovery Today Vol. No.
Ran-binding protein microtubule-organizing center (RanBPM) appears to function as a scaffolding protein in several signal transduction pathways. RanBPM is a crucial component of multiprotein complexes that regulate the cellular function by modulating and/or assembling with a wide range of proteins in different intracellular regions and thereby mediate diverse cellular functions. This suggests a role for RanBPM as a scaffolding protein. In this article, we have summarized the diverse functions of RanBPM and its interacting partners that have been investigated to date. Also, we have categorized the role of RanBPM into four divisions: RanBPM as a modulator/protein stabilizer, regulator of transcription activity, cell cycle and neurological functions.
Suresh Mikkili,Anup Kumar Panda 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.6
Commencing with incandescent light bulbs, every load today creates harmonics. Unfortunately, these loads vary with respect to their amount of harmonic content and their response to problems caused by harmonics. The prevalent difficulties with harmonics are voltage and current waveform distortions. In addition, Electronic equipment like computers, battery chargers, electronic ballasts, variable frequency drives, and switching mode power supplies generate perilous amounts of harmonics. Issues related to harmonics are of a greater concern to engineers and building designers because they do more than just distort voltage waveforms, they can overheat the building wiring, cause nuisance tripping, overheat transformer units, and cause random end-user equipment failures. Thus power quality is becoming more and more serious with each passing day. As a result, active power filters (APFs) have gained a lot of attention due to their excellent harmonic compensation. However, the performance of the active filters seems to have contradictions with different control techniques. The main objective of this paper is to analyze shunt active filters with fuzzy and pi controllers. To carry out this analysis, active and reactive current methods (id-iq) are considered. Extensive simulations were carried out. The simulations were performed under balance, unbalanced and non sinusoidal conditions. The results validate the dynamic behavior of fuzzy logic controllers over PI controllers.
Suresh Mikkili,Anup Kumar Panda 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.5
This research article presents a novel approach based on an instantaneous active and reactive power component (p-q) theory for generating reference currents for shunt active filter (SHAF). Three-phase reference current waveforms generated by proposed scheme are tracked by the three-phase voltage source converter in a hysteresis band control scheme. The performance of the SHAF using the p-q control strategy has been evaluated under various source conditions. The performance of the proposed control strategy has been evaluated in terms of harmonic mitigation and DC link voltage regulation. In order to maintain DC link voltage constant and to generate the compensating reference currents, we have developed Fuzzy logic controller with different(Trapezoidal, Triangular and Gaussian) fuzzy M.F.s. The proposed SHAF with different fuzzy M.F.s is able to eliminate the uncertainty in the system and SHAF gains outstanding compensation abilities. The detailed simulation results using MATLAB/SIMULINK software are presented to support the feasibility of proposed control strategy. To validate the proposed approach, the system is also implemented on a real time digital simulator and adequate results are reported for its verifications.