In order to solve the problem that current geophysical method is difficult locate in mud of bored piles, effective exploration karst caves at bottom author puts forward application Internet Things technology and sonar construction pile foundation a high altitude environment. Combined with propagation characteristics stress waves, detection for piles proposed, detector (JL-SONAR) signal analysis...

In recent decades the West Antarctic Ice Sheet has experienced warming and glacial retreat. Despite receiving growing attention, knowledge of glacial dynamics in this region remains limited. Snow accumulation data is sparse and fails to capture true spatial variability. A shallow firn core, drilled at the triple ice divide between Pine Island Glacier, Institute Ice Stream, and Rutford Ice Strea...

Introduction: The Chesapeake Bay impact structure, 35 Myr old and 85 km in diameter, is one of the largest and best preserved impact structures on Earth [1]. The structure was drilled in the central part at Eyreville in 2005-2006 during an ICDP-USGS drilling project. Three drill cores (Eyreville A, B, and C), intersecting the impact structure to a total depth of 1766 m, were recovered within th...

The mean annual effective dose from natural radionuclides for users of drilled wells was estimated to be 0.41 mSv, for users of wells dug in the ground 0.05 mSv and for people using water from waterworks 0.02 mSv. The highest effective dose from drinking water was caused by 222Rn (Fig. 2) constituting 75% and 60% of the total effective dose caused by all natural radionuclides for drilled-well u...

Abstract The current paper studies the dynamics and age of Triangle du Tacul (TDT) ice apron, a massive volume lying on steep high-mountain rock wall in French side Mont-Blanc massif at an altitude close to 3640 m a.s.l. Three 60 cm long cores were drilled bedrock (i.e. wall) 2018 2019 TDT apron. Texture (microstructure lattice-preferred orientation, LPO) analyses performed one core. two remain...

metal contents viz., cu, ni, co, zn and cd in sediment cores recovered from the vembanad lake, the largest estuarine-lagoonal system on the west coast of india, were analysed to understand the pollution levels and the impact on the coastal environment. of the three cores studied, vc-10 shown enrichment in all metals compared to other cores, as it is located in the vicinity of industrial area. f...

In this paper, the authors investigate the question of when a partition of n ∈ N is an s-core and also a t-core when s and t are not relatively prime. A characterization of all such s/t-cores is given, as well as a generating function dependent upon the polynomial generating functions for s/t-cores when s and t are relatively prime. Furthermore, characterizations and generating functions are gi...

OBJECTIVE Percutaneous cochlear implantation (PCI) surgery uses patient-specific customized microstereotactic frames to achieve a single drill-pass from the lateral skull to the cochlea, avoiding vital anatomy. We demonstrate the use of a specific microstereotactic frame, called a "microtable," to perform PCI surgery on cadaveric temporal bone specimens. STUDY DESIGN Feasibility study using c...