Frequency of structural failure globally has necessitated geophysical investigation subsurface geology a site for engineering construction works. Combined very low frequency electromagnetic (VLF-EM) and electrical resistivity methods were used to provide detailed information on subsoil profile documentation references durable sustainable Thirteen traverses established from which data acquired. ...

lthough software engineers generally agree that software measurement must be goal oriented, little has been published on the results of shifting to goal-orientation and still less on how to systematically make that transition. Thus, when we at Schlumberger RPS decided to adopt the Goal/Question/Metric approach, we resolved to document each step and record our experiences at each stage of the tr...

It is assumed that many measurement programs fail because of the lack of normative models to assess a measurement program in advance. Our last years ESCOM presentation was about enhancing GQM with the characteristics of software development and software products. This enhancement improves the definition process of a measurement program. Schlumberger RPS is continuing its measurement program suc...

uniform linear array (ula)-based tapped-delay line (tdl) structure has good performance metrics when the signal sources are located at the middle angles. it offers poor performance when the signal sources are close to the array endfire. in this paper, a new approach is proposed which offers higher performance and desired beamforming on tdl structure when the wideband uncorrelated radio sources ...

A new four elements compact antenna array is presented and discussed to achieve enhanced phase resolution without sacrificing the array output power. This structure inspired by the Ormia Ochracea’s coupled ears. The analogy between this insect acute directional hearing capabilities and the electrically compact antenna array is used to enhance the array sensitivity to direction of arrival estima...

Vertical Electrical Soundings (VES) afford fast and economical measurements used in geophysical exploration. VES was for groundwater exploration at the permanent site of Waziri Umaru Federal Polytechnic, Birnin Kebbi. Eighteen (18) Sounding (Schlumberger array, maximum AB/2 distance 100 m) were performed, data acquired using ABEM terrameter (SAS 300c), to determine geoelectric units subsurface ...

A geophysical method of investigation has been deployed in order to give a quick overview the nature and rapidly changing subsurface lithologies that characterized Yikpata, Share, Kwara State, Nigeria. total nine (9) vertical electrical soundings (VES), using Schlumberger Array uniformly divided into three groups: basement, basement/sedimentary boundary sedimentary terrain, horizontal profiling...

The Steiner tree problem which is known to be NP-Complete is the following. Given a weighted undirected graph G = (V;E), and a set X V of terminals, the objective is to nd a tree of minimum cost which connects all the terminals. If the graph is directed, in addition to X, we are given a root r 2 V , and the objective is to nd a minimum cost arborescence which connects the root to each of the te...