Abstract The horizontal drilling trajectory of the anti-collision robot is taken as research object and its prediction model established in this paper. affected by many factors, such structural parameters auger, drill bit, process parameters, geological characteristics coal seam, etc., which results existence multi-level time-scale structure localization data time domain. wavelet analysis metho...

BACKGROUND Studies comparing internally linked (person-identifying) and unlinked (episodes of care) hospital discharge data (HDD) on hip fractures have mainly focused on incidence overestimation by unlinked HDD, but little is known about the impact of overestimation on patient profiles such as comorbidity estimates. In view of the continuing use of unlinked HDD in hip fracture research and the ...

Inverter circuits have been made by connecting two high-quality pentacene field-effect transistors. A uniform and pinhole-free 900 nm thick polyimide gate-insulating layer was formed on a flexible polyimide film with gold gate electrodes and partially removed by using a CO2 laser drilling machine to make via holes and contact holes. Subsequent evaporation of the gold layer results in good elect...

Taking into account the need for post-war reconstruction of country’s infrastructure, development high-quality drilling fluids based on Ukrainian mineral raw materials becomes a particularly urgent problem. Detailed studies rheological properties aqueous dispersions Na+-bentonite from Cherkasky deposit (Ukraine) were carried out in relation to horizontal directional drilling. The effect pH, ion...

Rotational drilling was a revolution in drilling technology. It made the drilling process more efficient and faster and more depth of well could be achieved through rotation method. Besides all of its advantages, the rotation approach induced some problems like pipe sticking and downhole cleaning to the drilling procedure. Hole cleaning and reduction of torque and drag seems to be vital in incl...

Directional drilling in the oil fields relies particularly on “on-fly” measurements of natural magnetic field (measurements while drilling; MWD); MWD are eventually used to construct well path. These superposition signals from internal, core and crustal, external, ionospheric magnetospheric sources noise elements borehole assembly. The internal mostly constant time accounted for through Earth's...

Blast furnace slag (BFS) was added into drilling fluid as a mud cake modifier (MCM) for the reuse of BFS. The effects of MCM on drilling fluid rheology and shear strength of cementformation interface (SSCFI) were evaluated. The experimental results showed that the optimized formula of the drilling fluid has 1.0 wt% MCM. The simulation results showed that SSCFI increased significantly with the a...

Traditional methods of chromite exploration are mostly based on geophysical techniques and drilling operations. They are expensive and time-consuming. Furthermore, they suffer from several shortcomings such as lack of sufficient geophysical density contrast. In order to overcome these drawbacks, the current research work is carried out to introduce a novel, automatic and opto-geometric image an...

During an earthquake, structures are subjected to both horizontal and vertical shaking. Most structures are rather insensitive to variations in the vertical acceleration history and primary considerations are given to the impact of the horizontal shaking on the behavior of structures. In the laboratory, however, most component tests are carried out under uni-directional horizontal loading to si...