Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 93 for “"Compression Ratio"”.
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Variable compression ratio for dirigible engines
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1933.
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High compression ratio turbo gasoline engine operation using alcohol enhancement
… This auto-ignition is dangerous to the operation of an internal combustion engine, as it can severely damage engine components. As engine designers are trying to improve the efficiency of the internal combustion engine, engine knock is a key limiting factor in engine design. Two methods …
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The effect of compression ratio on emissions from an alcohol-fueled engine
… emissions from alcohol fuels with respect to compression ratio. Compression ratio has been selected as the primary variable for this study, because alcohol-fueled vehicles are usually modified to have higher compression ratios than their gasoline-fueled counterparts in order to take advantage …
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Effects of operating conditions, compression ratio, and gasoline reformate on SI engine knock limits
… performed to investigate the effects of air-fuel ratio, inlet boost pressure, hydrogen rich fuel reformate, and compression ratio on engine knock behavior. For each condition the effect of spark timing on torque output was measured. Knock limited spark advance was then found for a range of octane …
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Design and analysis of a variable-compression, ratio internal-combustion engine : the Alvar engine concept
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Closed-Loop Combustion Control of a Multi Cylinder HCCI Engine using Variable Compression Ratio and Fast Thermal Management
… results in unnecessarily high CO2 emissions. The Compression Ignited (CI) engines have higher efficiency and hence lower CO2 emissions, but suffer from higher Nitrogen Oxide (NOx) and Particulate Matter (PM) emissions, and no three-way catalyst can be used. Large efforts are made to reduce the …
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Effect of Vertebroplasty with Bone Filler Device and Comparison with Balloon Kyphoplasty
… popular procedures for osteoporotic vertebral compression fractures. Although the kyphoplasty has a superior effect, it destroys normal vertebral trabecular structure and it has a higher cost. PURPOSE: To analyze vertebroplasty with a bone filler device compared with conventional kyphoplasty. …
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Performance evaluation of different data aggregation algorithms for different types of sensors in WSN based cluster
… consumption, average of absolute error and data compression ratio. The simulation results show that the best performance is shown by the CS-RD algorithm. The ADAM show intermediate performance for all sensors. In the average result, it can be said that the accuracy of CD-PF is better than other …
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Computational Investigation of Ethanol and Bifuel Feasibility in Solstice Engine
… the combustion chamber facilitates a higher compression ratio, thus increasing engine power and efficiency. Three dimensional computational simulation is used to investigate the feasibility of ethanol and gasoline-ethanol mixtures as a fuel over varying compression ratios in a GDI engine. …
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More effective use of fuel octane in a turbocharged gasoline engine : combustion, knock, vehicle impacts
Turbocharging, increasing the compression ratio, and downsizing a spark-ignition engine are well known strategies for improving vehicle fuel economy. However, such strategies result in higher in-cylinder pressures and temperatures which increase the likelihood of engine knock above that of …
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Investigation of Different Video Compression Schemes Using Neural Networks
Image/Video compression has great significance in the communication of motion pictures and still images. The need for compression has resulted in the development of various techniques including transform coding, vector quantization and neural networks. this thesis neural network based methods are …
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Hardware Implementation of a Novel Image Compression Algorithm
… bringing the need for efficient and effective compression. Image compression is important for effective storage and transmission of images. Many techniques have been developed in the past, including transform coding, vector quantization and neural networks. In this thesis, a novel adaptive …
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Practical algorithms for image compression and surface estimation
Practical Algorithms for Image Compression and Surface Estimation describes three algorithms for image compression and one algorithm for surface estimation that incorporates kriging and parametric cubic splines. Two of the image compression algorithms are innovative extensions of the Run Length …
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Unsupervised Morphological Word Clustering
… The clustering that yields the lowest lexicon compression ratio is considered the optimum. In addition, the hypothesis that the lowest compression ratio suffix clustering yields the best word clustering is tested. The system is tested on the CELEX English, German and Dutch lexicons and its …
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Satellite Image Processing for Remote Sensing Applications
This thesis investigates areas of image compression with particular reference to remote sensing imagery. The research described was carried out in four specific areas, namely, discrete cosine transform (DCT) for remote sensing imagery, lossless image compression based on conditional statistics, …
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The possibility of increasing compression ratios by using water as an anti-detonant
… of the heat of combustion. (3) Increasing the compression ratio requires a decrease in spark advance.
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Optimizing the scavenging system for high efficiency and low emissions: a computational approach
… internal combustion engine operating on high compression ratio, HCCI combustion is being developed to significantly improve the thermal efficiency and exhaust emissions relative to conventional crankshaft-driven SI and Diesel engines. A two-stroke scavenging process recharges the engine and is …
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Estimating File Compressibility Using File Extensions
Adaptive compression systems dynamically choose a compression strategy — including no compression — by monitoring CPU usage, output rate, expected time to compress, and perhaps most importantly, the estimated compressibility of the data. Many adaptive compression systems were designed with the …
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