The motion of a stone skimming over a water surface is considered. A simplified description of the collisional process of the stone with water is proposed. The maximum number of bounces is estimated by considering both the slowing down of the stone and its angular stability. The conditions for a successful throw are discussed. © 2003 American Association of Physics Teachers. @DOI: 10.1119/1.151...

The spur dike is widely used in the waterway renovation project upper reaches of Yangtze River as a remediation structure, but its water destruction very common, and influence permeable characteristics riprap on stability has been neglected many studies. Through method combining generalized flume test theoretical analysis, submerged degree dike, porosity body, size void nearby turbulent kinetic...

Introduction: Some plants show antimicrobial activity against wide range of microorganism. The aim of this study was to investigate the antimicrobial activity and stability of Zataria multiflora Boiss and Satureja khuzestanica essential oil (EO). Materials and methods: First, these plants (Zataria multiflora Boiss and Satureja khuzestanica) were collected, verified by a botanist, dried, and gr...

background: although various surface disinfectants have been introduced, most of them are toxic. the use of natural antimicrobial agent e.g. phytol, extracted from leptadenia pyrotechnica is a new strategy. the aim of this study was to evaluate the antimicrobial activity, toxicity, and stability of phytol. methods: the serial concentrations of phytol were prepared, and separately incubated with...

Among all of the slope stability methods, use of stone columns and geosynthetic elements can be a good way for stabilizing. One of the efficient ways in order to reinforce earth slopes is Geogrid Encased Stone Column (GESC). This technique can dramatically increase bearing capacity and decrease settlement rate. The aim of this paper is experimentally to investigate a comparison between the beha...

Background: Although various surface disinfectants have been introduced, most of them are toxic. The use of natural antimicrobial agent e.g. phytol, extracted from Leptadenia pyrotechnica is a new strategy. The aim of this study was to evaluate the antimicrobial activity, toxicity, and stability of phytol. Methods: The serial concentrations of phytol were prepared, and separately incubated with...