Time filter

Source Type

Mamilla V.R.,St Peters University | Rao G.L.N.,QIS Institute of Technology
Procedia Engineering | Year: 2013

In this paper a single cylinder constant speed air-cooled four-stroke direct injection diesel engine of 4.4 kW is selected for the experimental investigations to evaluate the performance and emission characteristics fuelled with Jatropha oil (JTME), and its blends (20%, 40%, 60%, 80% and 100%). The performance parameters are analyzed include Brake thermal efficiency whereas exhaust emissions include oxides of nitrogen, HC, Smoke and CO. The results of the experiment in each case were compared with baseline data of diesel fuel. It concluded that lower blend of biodiesel 20% JTME act as best alternative fuel among all tested fuel at full load condition. The experimental investigations on the effect of 20% Jatropha methyl esters (JTME) with diesel on performance, combustion and emission characteristics of diesel engine with different combustion chamber geometries (Spherical, toroidal and Re-entrant).Brake thermal efficiency for toroidal combustion chamber was found higher than that of other two combustion chambers. Smoke density, carbon monoxide and hydrocarbons was observed slightly lower for toroidal combustion chamber compared to the other two but those are lower when compared with standard diesel (SCC). However, nitrogen oxides were slightly lower for toroidal combustion chamber compared to the other two but it is higher when compared with standard diesel (SCC). © 2013 The Authors. Published by Elsevier Ltd.


Saravanan S.,Sri Venkateswara College of Engineering | Nagarajan G.,Anna University | Lakshmi Narayana Rao G.,QIS Institute of Technology | Sampath S.,Rajalakshmi Engineering College
Energy | Year: 2014

The present work explores the possibility of simultaneous reduction of NOx and smoke of a stationary CI (compression ignition) engine fuelled with biodiesel blend. Fuel injection timing is retarded which resulted in lower NOx emission with an increased smoke intensity. NOx emission of the biodiesel at the standard and retarded injection timing was predicted with the help of developed correlations and the same was compared with the NOx emission experimentally determined. It was observed that the predicted NOx emission of biodiesel is comparable with the experimentally determined. Fuel injection pressure was increased at the retarded injection timing and its effect on NOx and smoke emission was investigated. It was observed that the increase in smoke intensity resulting from the retarded injection timing was reduced significantly by increasing the fuel injection pressure. © 2014 Elsevier Ltd.


Muppalla S.,QIS Institute of Technology | Vaddempudi K.R.,QIS Institute of Technology
International Conference on Signal Processing and Communication Engineering Systems - Proceedings of SPACES 2015, in Association with IEEE | Year: 2015

In an industrial working environment employing multiprocessor communication using UART, noise is likely to affect the data and data may be received with errors. This kind of error occurrence may affect the working of the system resulting in an improper control. Several existing UART designs are incorporating error detection logic. This kind of logic, if detects errors, requires retransmission of corresponding data frames which take additional time for automatic repeat request (ARQ) and retransmission of data. Linear block codes like hamming code have forward error correction (FEC) as well as error detection capability. This paper presents a novel VLSI implementation of UART designed to include (8,4) extended hamming code called SEC-DED code that can correct upto one error and detect upto two errors. This improves the noise immunity of the system optimizing the error free reception of data. The whole design is implemented in Xilinx ISE 12.3 simulator targeted to Xilinx Spartan 6 FPGA. © 2015 IEEE.


Harshavardhan C.,QIS Institute of Technology | Koteswara Rao V.,QIS Institute of Technology
International Journal of Applied Engineering Research | Year: 2016

Now a days on chip communication has become complicated owing to the presence of many a number of slaves as well as masters. Communication protocols such as OCP (Open Core Protocol) and AXI (Advanced eXtensible Interface) have been developed to support the innumerable transactions that may happen on the bus connecting the masters and slaves. Besides the ordered transactions, the out of order transactions are not uncommon on the bus. In order to improve the communication efficiency, the responses from the out of order transactions may need be received in an order different from the request order. While doing so, a bus deadlock is possible if the bus system goes into an unsafe state with the arrival of the requests forming a trivial cycle. Bus deadlock avoidance techniques such as DALS (Deadlock Avoidance by Least Stalling) can avoid deadlock by not forwarding the request that may cause deadlock until the previous requests are fulfilled. In case the last request is of high priority its response may unduly be delayed. This paper presents a design of bus system with reconfigurable arbiter to prioritize the requests in the desired manner at the time the deadlock is likely to occur and executes them one by one in the prioritized order so that the prioritized transactions shall not be delayed. © Research India Publications.


Lavanya K.,QIS Institute of Technology | Rao V.K.,QIS Institute of Technology
2015 IEEE Power, Communication and Information Technology Conference, PCITC 2015 - Proceedings | Year: 2015

Convolution and deconvolution algorithms play a key role in digital processing applications. They involve many multiplication and division steps and consume a lot of processing time. As such, they play a vital role in determining the performance of the digital signal processor. Convolution and deconvolution implemented with Vedic mathematics proved fast as compared to those using conventional methods of multiplication and division. This paper presents a novel VHDL implementation of convolution and deconvolution algorithm with multiplier using radix-256 booth encoding to reduce the partial product rows by eight fold and carry propagate free redundant binary addition for adding the partial products, thus, contributing to higher speed. The design had been implemented for 16 bit signed and unsigned sequences. The delay was reduced by 18.27%. The entire design was implemented in Xilinx ISE 13.1 targeted towards Virex-7. © 2015 IEEE.


Saravanan S.,Sri Venkateswara College of Engineering | Nagarajan G.,Anna University | Lakshmi Narayana Rao G.,QIS Institute of Technology
International Journal of Sustainable Engineering | Year: 2016

The main objective of this work is to control the NOx emission of a stationary diesel engine fuelled with crude rice bran oil methyl ester blend with less sacrifice on smoke density and brake thermal efficiency (BTE) and also to investigate the factors influencing the objective. Fuel injection timing, percentage of exhaust gas recirculation and fuel injection pressure are chosen as the promising factors for the objective and NOx emission, smoke density and BTE are considered as response variables. Tests were conducted as per Taguchi’s L9 orthogonal array and the most influencing factor for each response variable and also the significance of each factor on the same was found out through analysis of variance (ANOVA). Response graph was drawn for each response variable and from the results of response graph and ANOVA the optimum combination of the factor levels in achieving the objective was obtained and the same was confirmed experimentally. © 2016 Taylor & Francis


Saravanan S.,Sri Venkateswara College of Engineering | Rao G.L.N.,QIS Institute of Technology
International Journal of Oil, Gas and Coal Technology | Year: 2014

This work attempts to reduce the smoke density of diesel engine by advancing the fuel injection timing and also the NOx emission of the engine by introducing EGR at the advanced injection timing. A single cylinder 4.4 kW air cooled, naturally aspirated, stationary diesel engine was utilised for the investigation. Engine tests were conducted at different loads at standard injection timing and advanced injection timing with and without EGR and performance and emission parameters were measured. It was observed that the smoke density was decreased by 33% at advanced injection timing with 20% increase in NOx emission. As a result of EGR, NOx emission was decreased by 63% with marginal increase in smoke density. The increase in smoke density resulted from EGR is lower than the smoke density of the engine at standard injection timing. Advanced injection timing with EGR increases the maximum heat releases rate of the engine. Copyright © 2014 Inderscience Enterprises Ltd.


Lakshmi Tulasi R.,QIS Institute of Technology | Srinivasa Rao M.,Jawaharlal Nehru Technological University | Usha K.,Center for Studies | Goudar R.H.,Center for Studies
Procedia Computer Science | Year: 2016

Numerous educational video lectures, CCTV surveillance, transport and other types have upgraded the impact of multimedia video content. In order to make large video databases realistic, video data has to be automatically indexed in order to search and retrieve relevant material. An annotation is a markup reference made to data in video in order to improve the video accessibility. Video annotation is used to examine the massive quantity of multimedia data in the repositories. Video annotation refers to the taking out of significant data present in video and placing this data to the video can benefit in "retrieval, browsing, analysis, searching comparison and categorization". Video annotation implies taking out of data and to attach such metadata to the video which will "accelerate the retrieval speed, ease of access, analysis and categorization". It permits fast and better understanding of video content and improves the performance of retrieval and decreases human time & efforts for better study of videos. Video annotation is imperative technique that assists in video access. Proposed system provides effortless access to the data of the video and decrease the time necessary to access and evaluate the video. Ontology-based video annotation helps the user to get the semantic information from video, which is essential to search the needful data from a video. © 2016 Published by Elsevier B.V.


Rao V.K.,QIS Institute of Technology | Lavanya K.,QIS Institute of Technology
Asia Pacific Conference on Postgraduate Research in Microelectronics and Electronics | Year: 2015

There has always been a quest going on for improving the performance of the multiplier as it is the key component in determining the performance of the digital signal processor. The Q-format multiplier implemented with Urdhva Triyagbhyam sutra of Vedic mathematics proved to be faster and area efficient. Yet, a further quest for increasing the performance of the Q-format multiplier resulted in the outcome of this paper. This paper presents a novel method using Booth encoding towards generation of reduced number of partial products and redundant binary adder for adding these partial products for implementation of 64 bit Q-format signed multiplier which substantially improved the performance by 22.60%, area reduced by 19.20%. This method has also been implemented for 16 bit and 32 bit multipliers along with 64 bit Q-format signed multiplier using Booth encoding and RB addition in VHDL targeted towards Xilinx FPGA Virtex-7 and results compared with those obtained by using Vedic Urdhva Triyagbhyam Sutra with CLA and found to have significant improvement in performance. © 2015 IEEE.


Arjunan S.,SRM University | Arjunan S.,QIS Institute of Technology | Kavitha H.P.,SRM University | Ponnusamy S.,SRM University | And 2 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2016

A novel amino acid stabilized composite ZnS/CuS photocatalyst working under visible light was successfully prepared by a co-precipitation method. The ZnS/CuS nanocomposites with different mole ratios were synthesized and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy and transmission electron microscopy. Absorption ranges and band gap energies, which correspond to photocatalytic behavior, were investigated by UV–Vis spectroscopy. The photocatalytic activities of ZnS/CuS nanocomposites were evaluated against the degradation of an organic dye, methylene blue, under UV light and a blue emitting LED. In this study, visible light driven photocatalysis was designed based on photo-induced direct interfacial charge transfer introduced through the modification of ZnS with CuS nanoparticles. The obtained ZnS/CuS nanocomposites exhibited excellent photocatalytic activity and good reusability compared with pure ZnS nanoparticles. Results clearly showed that the ZnS/CuS nanocomposite at a 4:1 mol ratio exhibited the highest photocatalytic activity indicated by the degradation of methylene blue under UV and visible light. © 2016 Springer Science+Business Media New York

Loading QIS Institute of Technology collaborators
Loading QIS Institute of Technology collaborators