INTRODUCTION Angular encoder accuracy is often the key limiting factor in rotational metrology systems. Inconsistent spacing of the graduations and spindle error motion are major sources of encoder error. Through calibration, the repeatable components of encoder error can be eliminated. Calibration systems have been developed to measure the error map at 128 angular intervals, achieving 0.01" (a...

An algorithm for generating the structure of a directed acyclic graph from data using the notion of causal input lists is prest'nted. The algorithm manipulates the ordt'ring of the variables with operations which very much resemble arc reversal. Operations are only applied if the DAG after the operation repre­ sents at least the independencies represented by the DAG before the operation until n...

The Takomkane Pro ject is a multiyear bed rock map ping pro gram ini ti ated by the BC Geo log i cal Sur vey in 2005. This pro gram will con cen trate on Me so zoic arc vol ca nic and plutonic rocks of the Quesnel Terrane in the vi cin ity of the Takomkane batholith, which strad dles the Bonaparte Lake (92P) and Quesnel Lake (93A) map sheets (Fig. 1). Pre vi ous bed rock maps of the area are ba...

T o develop a contour extraction tool for image simulations, the applicability of the Hopfield network is examined on the edge image around the roughly specified guide points. Our computational theory is that the edge map of the stretched belt-like images along the guide points should obey the following four constraints. (1) In thc longitudinal dircction, t l~c contour should consist of only on...

In this chapter, we review the historical arc of research on biogeomorphic interactions between fluvial geomorphology and riparian vegetation. We then report on an examination of the past 20 years of published research on this topic. Having classified studies according to the key relationships they have identified, we map those relationships to seek spatial patterns that emerge in terms of eith...

this paper presents a new arc starter circuit that is usable in manual metal arc welding (mma) power supplies. the proposed circuit uses an auxiliary circuit and a series coupling transformer for adding high frequency spikes to output dc voltage during arc striking. the proposed circuit is usable in inverter based arc welding supplies and it could result in a decrease of weigh, volume and expen...

the northwestern part of the kerman cenozoic magmatic arc (kcma) contains many areas with porphyry copper mineralization. in this research, we used the advanced space-borne thermal emission and reflection radiometer (aster) and enhanced thematic mapper plus (etm+) images of this region to map the distribution of hydrothermally altered rocks, based on their mineral assemblages. the spectral meas...

A volumetric modulated arc therapy (VMAT) approach to total body irradiation (TBI) has recently been introduced at our institution. The planning target volume (PTV) is divided into separate sub-volumes, each being treated with 2 arcs with their own isocentre. Pre-treatment quality assurance of beams is performed on a Sun Nuclear ArcCHECK diode array. Measurement of junction regions between VMAT...