Results 21 to 30 of about 1,257 (175)
Study of oxide nanoparticles as additives for vegetable lubricants [PDF]
Materials Research, 2014 Currently, vegetable oils have been studied as biolubricants in order to reach new environmental standards. Besides being non-renewable, mineral oils from petroleum bring consequences to the environment due to its low biodegradability.
Marinalva Ferreira Trajano +3 more
doaj +1 more source
Materials Research, 2022 The development of new environmentally-friendly cutting fluids is an important technological advancement. The aim of this study was to assess the tribological behavior of microemulsions (W/O) developed with epoxidized soybean oil and nonionic surfactants
Erinéia da Silva Santos +6 more
doaj +1 more source
Effect of desulfurization of diesel and its blends with biodiesel on metallic contact [PDF]
Materials Research, 2014 The current environmental scenario has required changes in fuel nature, in order to minimize the harmful effects caused by sulfur in diesel. However, reductions in sulfur content promote loss of its lubricity and consequently wear in the injection system
Valdicleide Silva e Mello +4 more
doaj +1 more source
Extraction and tribological investigation of top piston ring zone oil from a gasoline engine [PDF]
, 2006 With tightening emission regulations, increased expected fuel economy, and longer drain intervals impacting on lubricant formulation, greater understanding of how oil degrades in an automotive engine is becoming ever more important.
Chung, S. +6 more
core +1 more source
Evaluation of Lubricating Properties of Diesel Based Fuels Micro Emulsified With Glycerin [PDF]
Materials Research, 2017 The mineral diesel oil sold in Brazil, due to environmental reasons; presents sulfur concentration of 10 ppm, which causes a deficiency of lubricity, since sulfur is one of the chemical species that gives a good lubricating characteristic. Poor lubricity
Igor Micael Alves Uchôa +4 more
doaj +1 more source
二聚酸抗磨剂对航空煤油润滑性的影响Effects of dimer acid antiwear agent on lubricity of jet fuel
Zhongguo youzhi, 2023 为考察二聚酸抗磨剂对加氢精制航空煤油润滑性的改善作用，同时验证不同二聚酸抗磨剂的改善效果，分别采用桐油、棉籽油及妥尔油酸为原料进行了二聚酸的合成与精制，利用液相色谱仪、红外光谱仪、核磁共振波谱仪等验证了桐油基、棉籽油基及妥尔油酸基二聚酸的分子结构，采用球柱润滑性评定仪（BOCLE）法和高频往复试验机（HFRR）法考察了3种不同原料来源的二聚酸对航空煤油润滑性的改善作用，用显微镜分析试验球的磨痕形貌，并提出抗磨机制。结果表明：随着二聚酸添加量的不断增大，磨痕直径、表面划痕及深度不断减小；在BOCLE法中 ...
张雁玲， 王姝凡， 王宜迪， 杨卫亚， 李澜鹏， 曹长海 ZHANG Yanling, WANG Shufan, WANG Yidi, YANG Weiya, LI Lanpeng, CAO Changhai
doaj +1 more source
The Lubricity Analysis of Cutting Fluid Emulsions [PDF]
Materials Research, 2017 The new generation of cutting fluids should have some characteristics, such as low toxicity and biodegradability. A bio-cutting fluid emulsion are an excellent option because they present those properties, as well as good mechanical performance.
Erinéia da Silva Santos +5 more
doaj +2 more sources
Analysis of Sinus Variability in a Group of Cameroonian Athletes. [PDF]
J Sports Med (Hindawi Publ Corp)Background. Heart rate variability (HRV) analysis is a useful method for assessing the heart’s ability to adapt to endogenous and exogenous loads. Data from African population on HRV are scarce and even more so in sports populations. This study aimed to compare cardiac autonomic modulation response in Cameroonian athletes and sedentary. Methodology. We
Djientcheu DFY +7 more
europepmc +2 more sources
Micro and nanometric wear evaluation of metal discs used on determination of biodiesel fuel lubricity [PDF]
Materials Research, 2014 The contact of diesel fuel with engine subsystems demands a good wear resistance. Lubricity is an important feature for integrity of injection system and the sulphur composites are primarily responsible for lubrication of the injector nozzle.
Aline Cristina Mendes de Farias +2 more
doaj +1 more source
Materials Research, 2023 High Chromium Cast Iron (HCCI) has demonstrated its effectiveness as a potential material for applications in severe environments due to its remarkable wear resistance attributed to the volumetric fraction of carbides in the microstructure.
Willian Martins Pasini +10 more
doaj +1 more source