Results 221 to 230 of about 1,204 (263)

Endoscopic endonasal resection of a craniopharyngioma in a 23-month-old patient: illustrative case. [PDF]

J Neurosurg Case Lessons
Eaton J, Raub S, Ronsley R, Roth CL, Ermoian R, Friedman SD, Emerson SN, Ferreira M, Lee A, Bly RA, Ruzevick J.   +10 more
europepmc   +1 more source

The Earth's Greatest Porous Media

Perspectives of Earth and Space Scientists, Volume 7, Issue 1, December 2026.
Abstract How deeply does modern meteoric water circulate into the continental crust? How deep is the Earth's Critical Zone (CZ), the top layer of the continental lithosphere that co‐evolves with the atmosphere, hydrosphere, and biosphere, extending from vegetation canopy down to fresh bedrock and the base of active groundwater circulation?
Ying Fan, William E. Dietrich, Jérôme Gaillardet, Steve E. Ingebritsen   +3 more
wiley   +1 more source

Early warning signals of the termination of the African Humid Period(s). [PDF]

Nat Commun
Trauth MH, Asrat A, Fischer ML, Hopcroft PO, Foerster V, Kaboth-Bahr S, Kindermann K, Lamb HF, Marwan N, Maslin MA, Schaebitz F, Valdes PJ.   +11 more
europepmc   +1 more source

Sternberg canal defect and intracranial hypertension: a synergistic etiopathology in spontaneous cerebrospinal fluid rhinorrhea. Illustrative case. [PDF]

J Neurosurg Case Lessons
Rudd G, Park R, Ang T, Sritharan N, Di Ieva A.   +4 more
europepmc   +1 more source

Integrated geological datasets for the Zandrivierspoort Formation banded iron formation, Rhenosterkoppies Greenstone Belt, South Africa. [PDF]

Data Brief
Tibane LV, Mamba D, Nkosi ZH.
europepmc   +1 more source

An overview of techniques for monitoring and compensating tool wear in micro-electrical discharge machining. [PDF]

Heliyon
Nadda R, Nirala CK, Singh PK, Lee D, Kumar R, Singh T.   +5 more
europepmc   +1 more source

Stability of the marine nitrogen cycle over the past 165 million years. [PDF]

Nat Commun
Godfrey LV, Omta AW, Tziperman E, Li X, Hu Y, Falkowski PG.   +5 more
europepmc   +1 more source

Theory calculation and testing of air injection parameters in ice core drilling with air reverse circulation

Polar Science, 2018
Drilling with air reverse circulation is considered one of the most promising technologies in ice core drilling, especially in firn-ice drilling, as it has many advantages in preventing air circulation loss, improving stability of the borehole, and ...
Pinlu Cao, Baoyi Chen
exaly   +2 more sources

Research and Application of Gas-lift Reverse Circulation Drilling Technology to Geothermal Well Construction in Dalian Jiaoliu Island

Procedia Engineering, 2014
This paper describes the principle of air-lift reverse circulation drilling, and its process feature, equipment selection, drilling assembly, drilling parameters and technical measures.
Luheng, Qi, Xiumin, Ma, Yue, Chen
exaly   +2 more sources

Technical Improvements and Application of Air-lift Reverse Circulation Drilling Technology to Ultra-deep Geothermal Well

Procedia Engineering, 2014
Air-lift reverse circulation drilling technology is often used in geothermal well drilling, but there are many problems along with drilling depth increasing, such as double-wall drill pipe leaking, air-water mixer blocked, water way of bit blocked, Kelly
Jianliang, Zhang, Yong, Zhang, Zhang Jianliang, Zhang Yong   +3 more
exaly   +2 more sources