Received: December 18, 2015 Revised: September 29, 2016 Accepted: October 18, 2016 Abstract: Background: Aiming at the challenges in control and perdition of roof strata which caused by the complexity of coal mine roof, the force and vibration characteristics of drill bit have been analyzed considering the coupling vibration between drill bit and coal rock, and the characteristics of coupled vi...

INTRODUCTION Groundwater plays an important part in many regolith processes (chemical weathering, solute dispersion, etc.), but collecting groundwater data usually requires drilling that can be: a) expensive analyses for porosity, permeability, etc in addition to drilling costs; b) problematic rig availability and access to remote sites; c) under-sampled entire groundwater regimes characterised...

Apache Drill is a distributed system for interactive ad-hoc analysis of large-scale datasets. Designed to handle up to petabytes of data spread across thousands of servers, the goal of Drill is to respond to ad-hoc queries in a low-latency manner. In this article, we introduce Drill's architecture, discuss its extensibility points, and put it into the context of the emerging offerings in the in...

Signs of microbial life on Mars, if they exist, will probably exist underground. This paper describes a robotics system for handling and sub-sampling cores taken from a robotic drill. The system prepares samples for analysis and life detection experiments. This system has been integrated with a drill and other instruments and tested in the field. This paper presents a description of the system ...

This paper proposes a Graph semantic based Object Oriented Multidimensional Data Model (GOOMD). The model defines a set of graph based formal constructs that are used to specify the conceptual level design of data warehouses (DW). Besides offering a novel graph based semantic for multidimensional data representation, the proposed GOOMD model renders a unified realization of different logical st...

Drilling tools currently used in surgery depends only on the surgeon’s manual skills to stop the penetration when completing a hole. This paper presents a modular mechatronic system for automatic bone drilling in surgery. The development of a “modular system” that is compatible with motor-driven drills that are commercially available, rather than developing a new surgical drill, is emphasized. ...

• Oil, gas, and geothermal exploration benefit from drill bit monitoring • Bits are expensive and may be damaged by high temperature or pressure • Bit orientation can be monitored to help guide bore hole • State of the art: mud modulation • Mud used to cool and lubricate drill bit • Collar near bit chokes flow to relay signal • Pressure sensor at surface decodes • Effective but slow, unidirecti...

SAS/GRAPH® software enables you to summarize your data and present a summary using various charting options and view it from different directions. Drill down graphs let you slice and dice ONLY what you see in the main chart. To literally drill into a graph for additional information and charting, further coding is required, but easy to do. The method presented makes a chart vastly more dynamic....

[no abstract available]