Purpose Automatic robots can improve the efficiency of liquefied petroleum gas (LPG) tank inspection and maintenance, but it is difficult to achieve high-precision spatial positioning and navigation on tank surfaces. The purpose of this paper is to develop a spatial positioning robotic system...

This article describes the design of the evaluation of Healthy for Life (HFL), an adolescent health promotion project involving students in 21 middle schools in Wisconsin. The original design was a blocked random assignment of 21 schools to one of three conditions. However, most of the...