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71 articles for “Friction”
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Research ArticleOpen accessIn the abstractInteraction of Soil Static and Dynamic Stiffness and Buried Pipeline Under Harmonic VibrationAlireza Mirza Goltabar Roshan, Hossein Khalilpasha, Mohsen GhorbaniProblem statement: When earthquake is occur, many damages were occurred in pipelines that San Francisco (1906) and Manson (1908), Kobe (Japan) and ate are samples of this topic. So many researchers studied on the pipelines and dynamic forces. Approach: Determine static and dynamic performance parameters of the pipeline and the surrounding soil such as static stiffness, dynamic stiffness, damping and … …American Journal of Engineering and Applied Sciences, Vol. 3, Issue 2 · 30 Jun 2010 · 7,727 accessesView PDFCite
Research ArticleOpen accessIn the abstractFinite Element Modeling of Transient Temperatures in a Small-Caliber ProjectileM. Brian Thomas, Leon DozierProblem statement: Future generations of intelligent munitions will use Microelectromechanical Systems (MEMS) for guidance, fuzing logic and assessment of the battlefield environment. The temperatures fund in a gun system, however, are sufficient to damage some materials used in the fabrication of MEMS. The motivation of this study is to model the dynamic temperature distribution in a typical small-caliber projectile. Approach: … …American Journal of Engineering and Applied Sciences, Vol. 3, Issue 2 · 30 Jun 2010 · 8,045 accessesView PDFCite
Research ArticleOpen accessIn the abstractKinematics Model of Snake Robot Considering Snake ScaleRaisuddin Khan, M. Watanabe, A. A. ShafieProblem statement: In snake robot research, one of the most efficient forms of locomotion is the lateral undulation. However, lateral undulation, also known as serpentine locomotion, is ill-suited for narrow spaces, as the body of the snake must assume a certain amount of curvature to propel forward. Approach: To overcome the inability to adapt to narrow spaces, a novel type … …American Journal of Applied Sciences, Vol. 7, Issue 5 · 31 May 2010 · 8,130 accessesView PDFCite
Research ArticleOpen accessIn the abstractFemtotechnology: Nuclear Matter with Fantastic PropertiesA. A. BolonkinProblem statement: At present the term 'nanotechnology' is well known-in its' ideal form, the flawless and completely controlled design of conventional molecular matter from molecules or atoms. Such a power over nature would offer routine achievement of remarkable properties in conventional matter and creation of metamaterials where the structure not the composition brings forth new powers of matter. But even … …American Journal of Engineering and Applied Sciences, Vol. 2, Issue 2 · 30 Jun 2009 · 8,681 accessesView PDFCite
Research ArticleOpen accessIn the abstractAn Investigation of Valve Lift Effect on Air Flow and Coefficient of Discharge of Four Stroke Engines Based on ExperimentAbdul Rahim Ismail, Rosli Abu Bakar, SeminThe coefficient of discharge (CD) is defined as the ratio of actual discharge to ideal discharge. In an engine environment, ideal discharge considers an ideal gas and the process to be free from friction, surface tension, etc. Coefficients of discharge are widely used to monitor the flow efficiency through various engine components and are quite useful in improving the performance … …American Journal of Applied Sciences, Vol. 5, Issue 8 · 31 Aug 2008 · 7,431 accessesView PDFCite
Research ArticleOpen accessIn the abstractTribochemical Performance of Cell-treated Nickel MatrixBing Shi, Thomas B. Kuhn, Hong Liang, Lawrence K. DuffyNickel (Ni) has been studied as a biomaterial for a long time because of the unique mechanical properties and corrosion resistance. In this study, the frictional properties and wettability of Ni under dry and lubricated conditions, including cell treatment, were compared in order to investigate its tribological performance under conditions similar to that in a human body. The wettability was … …American Journal of Biochemistry and Biotechnology, Vol. 3, Issue 3 · 30 Sep 2007 · 6,477 accessesView PDFCite
Research ArticleOpen accessIn the abstractReservoir Oscillations with Through FlowA.A. KhanThe two-reservoir problem with through flow is a common feature in wastewater treatment plants. The start of the through flow may cause water surface oscillations in the reservoirs and velocity variations in the connecting pipe during the initial unsteady phase that may adversely affect the operation and under certain conditions may cause overtopping of the upstream reservoir. The classical solution … …American Journal of Environmental Sciences, Vol. 3, Issue 1 · 31 Mar 2007 · 7,030 accessesView PDFCite
Research ArticleOpen accessIn the abstractRelationship Between Shear Strength and Soil Water Characteristic Curve of an Unsaturated Granitic Residual SoilThamer Ahmed Mohamed, Faisal Hj. Ali, S. Hashim, Bujang B.K. HuatShear strength parameters are crucial for stability analyses of slopes against slope failures and landslides. The three shear strength parameters that are required to define a failure envelope of an unsaturated soil are c’ (apparent cohesion), Φ’ (effective angle of friction) and Φb (shear strength change with change in matric suction). A soil-water characteristic curve (SWCC) that relates the water … …American Journal of Environmental Sciences, Vol. 2, Issue 4 · 31 Dec 2006 · 7,350 accessesView PDFCite
Research ArticleOpen accessIn the abstractNumerical Investigation of Flow Control by Suction and Injection on a Subsonic AirfoilM. H. Shojaefard, A. R. Noorpoor, A. Avanesians, M. GhaffarpourThis study presents a numerical study concerning flow control by suction and injection. The case studied is the flow field over a subsonic airfoil with four suction and injection slots on the suction side of the airfoil. Five different angles of attack, 0, 5, 10, 13.3 and 20 with the Mach number of 0.15 are studied. Three cases are studied … …American Journal of Applied Sciences, Vol. 2, Issue 10 · 31 Oct 2005 · 7,428 accessesView PDFCite
Research ArticleOpen accessIn the abstractThe Effects of Oil Film Shape on Piston Ring and Liner Tribology Under Mixed LubricationAbbas Razavykia, Cristiana Delprete, Eugenio Brusa, Yaser HosseiniMechanical power loss reduction at lubricated reciprocating and rotating components is recognized as an approach to improve the efficiency and to reduce the emissions of Internal Combustion Engines (ICEs). To achieve these goals, the instantaneous investigation of lubrication characteristics is required. Piston ring pack is of paramount importance as it is known as major contributor to frictional losses and energy … …American Journal of Engineering and Applied Sciences, Vol. 14, Issue 4 · 10 Nov 2021 · 6,523 accessesView PDFCite