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Effect of Elliptical Dimples on Hydrodynamic Lubrication Jinghu Ji 1,a, Hao Wang1,2,b and Yonghong Fu1,c 1School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu Province, China 2Intellectual Property Research Center of Jiangsu Province, Jiangsu University, Zhenjiang, Jiangsu Province, China ajijinghu@ujs.edu.cn (corresponding author), bwanghaozl@126.com, cfyh@ujs.edu.cn, Keywords: hydrodynamic lubrication, surface texturing, elliptical dimple, slender ratio, inclination angle Abstract.
Introduction It has been proved that surface texturing can improve tribological performance in mechanical components. [1].
Theoretical and experimental studies have indicated that the geometrical parameters of textures are the most important factors to optimize texturing benefits [2,3].
It was found that the dimple shape, orientation and size affect the hydrodynamic lubrication significantly.
Hence, the range affected by the ends effect in hydrodynamic lubrication may be a reasonable analysis by the length of a dimples column.

In ceramic/metal composites such as tetragonal ZrO2/Ni[2, 3, 4, 5], Al2O3/Ni[6, 7] have been found to show superior magnetic and mechanical properties.
Cobalt is often used as additive for TiNi phase in order to control its phase stability and related electric properties.
Mechanical and electrical properties of these composites were investigated in order to develop high performance ceramic/intermetallics composites.
Therefore, the fracture strength of 3Y-TZP/TiNi composites is supposed to be influenced by two factors.
The mechanical and electrical properties are summarized as follows

As a consequence, the patient has to use a collar, which supports and prevents movements, which affect the damaged zone.
Cervical Plate The Mechanical properties considered for the materials are shown in table 1.
Mechanical Properties for the FEM Cervical Model. 3.
The mechanical behavior of this material may be considered as orthotropic.
Rehabilitation Med, 4, p.110-113. (1972) [5] Holly, L. & Et. al., Cervical spine trauma associated with moderate and severe head injury: incidence, risk factors, and injury characteristics.

The preliminary trials concentrated on integrating air into concrete mixtures to decrease weight without substantially affecting strength.
Variations in the mix design, including the kind and quantity of cement, the inclusion of retarders or accelerators, and environmental factors like temperature and humidity, can affect the first setting time.
Controlling these factors on big building sites can be challenging, which may result in possible quality shortcomings.
Liu, “A novel lightweight concrete-fabrication and its thermal and mechanical properties,” Constr.
Wang, “Mechanical, thermal insulation, thermal resistance and acoustic absorption properties of geopolymer foam concrete,” Cem.

The previous researches focus on the parameters affecting the elastic constants or compressive properties of re-entrant honeycombs.
Scarpa, Mechanical Properties of Auxetic Carbon/Epoxy Composites: Static and Cyclic Fatigue Behaviour, Physica Status Solidi B-Basic Solid State Physics, 246(9) (2009) 2102-2110
Lumley, Trends in Acoustic Properties of Iron Particle Seeded Auxetic Polyurethane Foam, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 218(2) (2004) 241-244
Evans, The Mechanical Properties of Conventional and Auxetic Foams.
Evans, The Mechanical Properties of Conventional and Auxetic Foams.

Ti-6Al-4V is an alloy that is increasingly used in aeronautics due to its high mechanical properties coupled with the lightness.
Previous studies showed that the key factor that rules the mechanical properties and the fatigue life of the joint is its morphology.
The underfill and reinforcement defects not only influence the appearance of the weld joints, but mainly causes a stress concentration at the weld edges, which have a great effect on the mechanical properties of the weld joint, in particular on the fatigue behavior.
Effect of welding parameters on morphology and mechanical properties of Ti-6Al-4V laser beam welded butt joints.
Investigation on the microstructure and mechanical properties of Ti-6Al-4V alloy joints with electron beam welding.

Such pressure sores disrupt every aspect of a person's life—affecting health, employment, education, and social interaction.
It is further influenced by the type, property of the cushion material and nature of loading.
References [1] Kosiak M. (1976), A mechanical testing surface: It’s effect on pressure distribution.
Human Factors. 29(5), 563-575
J Rehabil Res, 27(2):135-140 [9] Chow WW: Mechanical properties of gels and other materials with respect to their use in pads transmitting forces to the human body.

The propagation of microwave through the material can be affected by these variation in properties.
One way is to monitor the hazard factors, such as water content in concrete, which is closely related to material or structural deterioration processes.
In this respect, the hazard factors that may induce the change of permittivity or permeability can be detected and quantified, through the monitoring of these coefficients.
When material properties are known, the concrete thickness can be easily estimated through Eq. 14.
Neville: Properties of Concrete, Fourth Edition (Pearson Education Limited, England, 1999)

The most important factors in developing the mineral wool core are optimization of the Curing system and density of the used resin.
These 'shots' impair the insulation properties of the final product [1].
Properties of edge region in mineral wool board.
IEA Annex 24 Final Report, vol. 3, Task 3 Material Properties.
N., "Acoustical properties of fibrous absorbent material", Applied Acoustics, 1970, Vol.3, pp.105- 106

The improved measures, which is under the premise of not affecting power performance and economic efficiency of IC engine, combining the emission process of IC engine was presented, it needs some measures to improve the quality of biodiesel and the system of IC engine to control the emission of the harmful substances, in this way the problem of energy shortage and environmental pollution can be ameliorated.
Introduction Petroleum resource is an important factor that the development of human society relays on, which is related to national economic stability and national security.
Factors affecting cetane number of biodiesel including two parts: one is that cetane number of animal oil methyl ester is higher than that of vegetable oil methyl esters; the other is that long carbon chain contributes to the improvement of cetane number, the less unsaturated double bonds, the higher the cetane number [18].
Depressants can improve the cold flow properties of biodiesel, making the engine work at low temperature.
[14] Kwanchareon P, Luengnaruemitchai A and Jai-In S: Solubility of a diesel–biodiesel–ethanol blend, its fuel properties, and its emission characteristics from diesel engine.