Results 11 to 20 of about 735,590 (286)

Adaptive color space model based on dominant colors for image and video compression performance improvement

open access: yesКомпьютерная оптика, 2021
This paper describes the use of some color spaces in JPEG image compression algorithm and their impact in terms of image quality and compression ratio, and then proposes adaptive color space models (ACSM) to improve the performance of lossy image ...
S. Madenda, A. Darmayantie
doaj   +1 more source

Characterization and Impact of Waste Plastic Oil in a Variable Compression Ratio Diesel Engine

open access: yesEnergies, 2021
The characterization of pyrolysis oil obtained from mixed waste plastics and its utilization in a compression ignition engine were investigated. The chemical compositions and physicochemical properties of distilled waste plastic oil (WPO) and crude waste
Khatha Wathakit   +7 more
doaj   +1 more source

Performance of Curzon-Ahlborn engine along with its engine speed and compression ratio

open access: yesJournal of Thermal Science and Technology, 2019
We evaluated the ideal limits of performance (power and efficiency) of heat engines operated with external heat sources along with their engine speed and compression ratio, using the method of adjoint equations based on variational principle. It is known
Shinji KOJIMA
doaj   +1 more source

First-principles investigation of anisotropic constitutive relationships in pentaerythritol tetranitrate [PDF]

open access: yes, 2008
First-principles density functional theory (DFT) calculations have been used to obtain the constitutive relationships of pentaerythritol tetranitrate (PETN-I), a crystalline energetic material.
Conroy, M. W.   +3 more
core   +1 more source

PCBMS: A Model to Select an Optimal Lossless Image Compression Technique

open access: yesIEEE Access, 2021
This article presents a parameter combination-based method selection (PCBMS) approach to select an optimal lossless data compression technique and provides an analysis based on experimental results to show its effectiveness.
Md. Atiqur Rahman, Mohamed Hamada
doaj   +1 more source

Multi-level quantum Diesel engine of non-interacting fermions in a one-dimensional box

open access: yes, 2020
We consider the toy model of quantum Diesel cycle without temperature constructed from non-interacting fermions, which are trapped in a one-dimensional box.
Ram, Shish, Singh, Satnam
core   +1 more source

Improving the Efficiency of Spark-Ignition Internal Combustion Engine Using a Novel Electromagnetic Actuator and Adapting Increased Compression

open access: yesEnergies, 2023
This paper presents an empirical study of a spark-ignition internal combustion engine with modifications made to increase its effectiveness. The modification was implemented bi-directionally in terms of changes to the compression ratio and changes to the
Jarosław Mamala   +4 more
doaj   +1 more source

Synchrotron radiation X-ray diffraction analysis of pyrophyllite under high-pressure

open access: yes矿业科学学报, 2019
High-pressure synchrotron radiation X-ray diffraction experiment on pyrophyllite powders of Mentougou in Bejing were carried out.It was found that the (002) peak of pyrophyllite was diminished when pressure up to 15 GPa,the layered orderly stacking ...
Deng Wenli   +4 more
doaj   +1 more source

Hardware architecture for lossless image compression based on context-based modeling and arithmetic coding [PDF]

open access: yes, 2007
In this paper we present a novel hardware architecture for context-based statistical lossless image compression, as part of a dynamically reconfigurable architecture for universal lossless compression.
Canagarajah, CN   +3 more
core   +2 more sources

Characteristics of homogeneous charge compression ignition (HCCI) combustion and emissions of n-heptane [PDF]

open access: yes, 2005
This paper reports the outcome from a systematic investigation carried out on HCCI (Homogeneous Charge Compression Ignition) combustion of a diesel type fuel.
Ladommatos, N, Ma, T, Peng, Z, Zhao, H
core   +1 more source

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