NOPR Collection:

Performance Evaluation of NAS Parallel Benchmarks in Hypervisor using Design of Experiment

2014-02-07T16:52:43Z

Title: Performance Evaluation of NAS Parallel Benchmarks in Hypervisor using Design of Experiment Authors: Prasad, Bhukya Devi; Sony, A L Reeta Abstract: Server Consolidation is desired in order to make efficient use of available servers. This is achieved by using the concept of hypervisor. A large number of hypervisors are available in the market. Users have to choose a hypervisor depending on the type of application. Due to the large difference in the architecture of various hypervisors, it is very difficult to find which hypervisor will be best suitable for the application. The aim of this paper is to benchmark the hypervisors and examine the performance of NAS Parallel Benchmarks. Two hypervisors i.e. Xen and VMware were identified and their performance was measured against various factors. Page(s): 81-86

Preparation, Characterization and Application of Zeolite-based Catalyst for Production of Biodiesel from Waste Cooking Oil

2014-02-07T16:30:43Z

Title: Preparation, Characterization and Application of Zeolite-based Catalyst for Production of Biodiesel from Waste Cooking Oil Authors: Hassani, Maryam; Najafpour, Ghasem D; Mohammadi, Maedeh; Rabiee, Mahmood Abstract: Zeolite-based catalyst was prepared from a fine powder and kaolinite by pelletization method and used to synthesize fatty acid methyl esters (FAME) known as biodiesel from waste cooking oil (WCO) containing high amounts of free fatty acids (FFA). The prepared catalyst was characterized by Thermogravimetric analysis (TG/DTA), X-ray Diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy and Brunauer-Emmett-Teller (BET) surface area analysis. The zeolite-based catalyst was employed to simultaneously catalyze the esteriﬁcation of fatty acids and transesteriﬁcation of triglycerides present in the waste oil feedstock to biodiesel. The condition for biodiesel synthesis was optimized in terms of reaction temperature (50-85 ^oC), methanol/ WCO molar ratio (2.6-6.0) and reaction time (2-10 h). Maximum triglyceride conversion of 46 % was achieved at the near optimum conditions. These conditions were defined at reaction temperature of 70 ^oC, methanol/ WCO molar ratio of 5.1 and reaction time of 6 h. Page(s): 129-133

Design of High Speed Low Power Counter using Pipelining

2014-02-08T16:53:53Z

Title: Design of High Speed Low Power Counter using Pipelining Authors: Vijeyakumar, K N; Sumathy, V; Pramod, P; Saravanakumar, S Abstract: We present high-speed scalable counter architectures for high operating frequencies. The design methodology implemented in a 16 bit counter architecture uses basic module and subsequent modules for count generation. The triggering pulses for a subsequent module is generated from state transitions of basic module and preceding subsequent modules using State Exciting Logic (SEL) in case of synchronous operation where clock pulses trigger all the modules simultaneously. As an extension, we connected the modules in asynchronous mode where the most significant bit (MSB) of module/stage is used as clock pulse for the immediate succeeding module. The novelty of the design is the realization of all subsequent modules with equal number of gates, which maintain uniform setup time for all the D Flip Flops (FFs) in the module. And, thus the D FFs when triggered by clock pulse gives uniform output. The proposed counter is designed using VHDL code and simulated using Altera Quartus II EP1C20F400C7 device. Analysis reveals that the power dissipation of our proposed counter is 80.47 mW and 80.46 mW with delay parameter of 9.097 ns and 22.476 ns for synchronous and asynchronous connection respectively at 250 MHz. Page(s): 117-123

An experimental investigation on off-grid solar photovoltaic power system using matrix converter

2014-02-11T16:30:43Z

Title: An experimental investigation on off-grid solar photovoltaic power system using matrix converter Authors: Sumithira, T R; kumar, A Nirmal Abstract: This article investigates the possibility of providing electricity from off grid solar photovoltaic power systems (OGSPVPS) for a remote location without electricity connection in the state of Tamil Nadu. Crucial review of literature disclose that, in the design of a solar photovoltaic power system, matrix converters are not dealt with so far to produce better quality and low distortion power efficiently to the loads. However, cascaded H bridge multilevel inverters are widely used to obtain a stepped sinusoidal output voltage in solar photovoltaic application. In this work, an attempt has been made to design and develop an OGSPVPS by incorporating single phase matrix converters in order to obtain a feasible solution for medium power applications at remote locations. Also, the proposed matrix converter for solar photovoltaic application claim a total harmonic distortion of less than 7%. Finally, simulation results are presented to prove the feasibility and the experimental work was investigated to validate the results. Furthermore, the capability of matrix converters to operate in rectifier mode is presented, thereby substantiating that it can facilitate grid connected solar photovoltaic uninterruptible power supply (UPS) in addition to off-grid system. Page(s): 124-128