As a physiochemical property, asphaltenes are known to be one the most surface active compounds in crude oil. Due to such property, their behavior is most probably influenced by fluid-fluid interactions at the contact surface (interface). Potentially and naturally, in most cases, water is in contact with crude oil and is co-produced with it as well. Considering that asphaltene molecules are pol...

background; various industries produce and discharge wastes containing different heavy metals into the environment. apart from using living biomass, dead and dried biomasses have been introduced as a new field of biotreatment technology. method; the cadmium (cd) (ii) removal characteristics of live (growing), dead (autoclaved), and oven-dried biomasses of aspergillus versicolor were examined as...

Research papers usually contain a significant number of links to other resources. For the most part, they reference other printed research papers, but there are also a non-trivial number of links to resources on the World Wide Web. Unlike printed research papers, references to WWW resources may become invalid after time. The server containing the page may be taken offline, be temporarily unavai...

Asphaltene precipitation/deposition is considered a problem of formation damage, which can reduce the oil recovery factor. In addition, asphaltenes be deposited in pipelines and surface installations, causing serious complications guaranteeing runoff, decreasing production wells. The precipitation minimized by reducing flowrate or using chemical inhibitors. Analyzing stability trend petroleum v...

Abstract This paper mainly studies the tribological performance of friction pairs and poor lubrication during piston movement. Based on average Reynolds equation comprehensively considering variable viscosity density characteristics lubricating oil, a transient hydrodynamic model ring-cylinder liner pair is established. By solving established model, oil film thickness value, value other paramet...