Results 51 to 60 of about 177 (131)

Study on Construction Technology of Rock-socketed Pile Group for Offshore Wind Turbine Generators

Renmin Zhujiang, 2020
This paper simulates and analyzes the driveability of steel pipe pile under complex geological conditions by the GRLWEAP software,and studies the construction technology of integrated rock-socketed pile group based on the statistical analysis of the ...
CHENG Zishuo
doaj  

Use of the Rotary-Percussion Drilling Technology in the OKR Mining Conditions and by Drilling the Wells for Purposes of Heating Pump Installation [PDF]

Acta Montanistica Slovaca, 2004
Sedimentary rocks in the Ostrava-Karviná Coalfield (OKR) especially the Saddle Seams of the Karviná Formation are marked with considerable abrasive property following from the high content of siliceous component in these rocks.
Koníèek Jiøí, Mazáè Josef
doaj  

Static‐Guided Endodontics for Complex Intracanal Obstructions and Zirconia Post Removal: Report on Three Cases

Clinical Case Reports, Volume 14, Issue 7, July 2026.
ABSTRACT A standardized static‐guided framework integrating CBCT and intraoral scanning provides predictable, minimally invasive management for diverse intracanal obstructions. This unified digital workflow ensures precise root canal localisation in severe obliteration and conservative retrieval of fractured fiber or ultra‐hard posterior zirconia posts
Xinxuan Wang, Xuguang Li, Baicheng Yi
wiley   +1 more source

Immediate Placement of an Implant Connected to a Customized Zirconia Membrane in Compromised Sockets: First Two Case Reports

Clinical Case Reports, Volume 14, Issue 7, July 2026.
Digital planning of the implant and CZM in the maxilla. (a, b) CBCT measures; (c) ZM in blue and axis of the future abutment in yellow; (d) connection of the implant (red) to the ZM connector at the inner surface (green arrow); (e) position of the assembly ZM/Implant; (f) ZM for clinical use with perforations; (g) the ZM connector; (h) screw fixation ...
Laith Glissa, Latifa Berrezouga
wiley   +1 more source

Research on Chip Removal Performance of Rotary Percussive Ultrasonic Drill for Planetary Rock Sampling

Aerospace
The objective of the kinematic model of rock chips is to examine the impact of the driving parameters of drilling tools on the effective chip removal speed, with a view to analyze the chip removal performance of rotary percussion ultrasonic drilling. The
Yinchao Wang, Dongdong Zheng, Zihao Yin, Weiwei Zhang, Lin Zu, Guanghong Tao, Suyang Yu   +6 more
doaj   +1 more source

A Stepwise Approach to Managing Bilateral Maxillary Sinus Tracts: A Case Report

Clinical Case Reports, Volume 14, Issue 7, July 2026.
ABSTRACT This case report describes a rare presentation of bilateral intraoral sinus tracts of odontogenic origin associated with a maxillary right first molar (Universal #3). A key diagnostic challenge was differentiating an endodontic infection from vertical root fracture (VRF) in a previously treated tooth; no J‐shaped probing defect was detected ...
Ali Chamani, Maryam Forghani, Reza Shakiba, Arsalan Shahri   +3 more
wiley   +1 more source

Simulation Study on Compound Percussion Frequency Matching Characteristics

Shiyou jixie, 2019
There are many researches on the traditional axial impact rock breaking and torsional impact rock breaking mechanism. But researches on the rock breaking mechanism of compound percussion drilling are few and are still in infancy state.
Li Yumei, Zhang Tao, Su Zhong, Yu Liwei, Liu Jianming   +4 more
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Coral reef and mangrove interplay during Holocene sea level changes, Belitung Island, Indonesia

Earth Surface Processes and Landforms, Volume 51, Issue 7, July 2026.
The fate of mangroves and coral reefs during the ongoing sea level rise depends not only on our ability to preserve the ecosystems but also on their geological preconditioning. Therefore, strategies to preserve mangrove ecosystems, while undoubtedly essential, wecan only be successful if accounting for their geological history. Abstract Coral reefs and
Tubagus Solihuddin, Gino de Gelder, Dwi Amanda Utami, Frida Sidik, Rima Rachmayani, Marfasran Hendrizan, Sri Yudawati Cahyarini, Meggi Rhomadona Purnama, Dilruba Erkan, Millary Widiawaty, Mary Elliot, Laurent Husson   +11 more
wiley   +1 more source

Structural Design and Motion Behavior Analysis of Composite Percussion Drilling Tool

Shiyou jixie, 2019
The high strength, poor drillability and strong breaking-resistance of deep complex hard formation rocks often result in stick-slip vibration and premature wear of the PDC bit.
Wang Wei, Liu Gonghui, Li Jun, Zha Chunqing, Huang Tao   +4 more
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Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

Materials Research Express, 2020
Modern manufacturing industries prefer laser drilling processes owing to the adequate controlled drilling in comparison with existing alternatives. The presented experimental study mainly accounts defocusing impact along with other technical parameters ...
Saad Nawaz, Muhammad Kashif, Naseem Abbas, Muhammad Farooq, Muhammad Farhan, Muhammad Amjad, Fahad Noor, Rizwan Ali Naqvi   +7 more
doaj   +1 more source