Results 81 to 90 of about 9,104 (217)

Drill string Vibration Modeling Including Coupling Effects

International Journal of Industrial Engineering and Production Research, 2007
Abstract: The governing equations of motion for a drill string considering coupling between axial, lateral and torsional vibrations are obtained using a Lagrangian approach. The result leads to a set of non-linear equations with time varying coefficients.
H. Ahmadian, S. Nazari, H. Jalali
openaire   +1 more source

Quantum Emitters in Hexagonal Boron Nitride: Principles, Engineering and Applications

Advanced Functional Materials, Volume 36, Issue 20, 9 March 2026.
Quantum emitters in hexagonal boron nitride have emerged as a promising candidate for quantum information science. This review examines the fundamentals of these quantum emitters, including their level structures, defect engineering, and their possible chemical structures.
Thi Ngoc Anh Mai, Md Shakhawath Hossain, Nhat Minh Nguyen, Yongliang Chen, Chaohao Chen, Xiaoxue Xu, Quang Thang Trinh, Toan Dinh, Toan Trong Tran   +8 more
wiley   +1 more source

Modeling Friction Performance of Drill String Torsional Oscillation Using Dynamic Friction Model

Shock and Vibration, 2017
Drill string torsional and longitudinal oscillation can significantly reduce axial drag in horizontal drilling. An improved theoretical model for the analysis of the frictional force was proposed based on microscopic contact deformation theory and a ...
Xingming Wang, Ping Chen, Zhenhua Rui, Fanyao Jin   +3 more
doaj   +1 more source

4D Printing of Magnetically Responsive Shape Memory Polymers: Toward Sustainable Solutions in Soft Robotics, Wearables, and Biomedical Devices

Advanced Science, Volume 13, Issue 15, 13 March 2026.
Merging 4D printing with magneto‐responsive shape memory polymers opens new avenues for intelligent, reconfigurable systems. This review navigates cutting‐edge fabrication techniques, magnetic fillers, and smart polymer matrices, unveiling their potential in soft robotics, biomedical devices, and wearable tech.
Kiandokht Mirasadi, Mohammad Amin Yousefi, Liuchao Jin, Davood Rahmatabadi, Majid Baniassadi, Wei‐Hsin Liao, Mahdi Bodaghi, Mostafa Baghani   +7 more
wiley   +1 more source

Some aspects of operational reliability of the drill string and its components in well construction process [PDF]

, 2013
The paper considers operational efficiency of the well deepening procedure based on the probable drilling performance and the state of drill string components.
Hohol, V. I., Ohorodnikov, P. I., Svitlytskyi, V. M.   +2 more
core  

Control of a class of multibody underactuated mechanical systems with discontinuous friction using sliding-mode [PDF]

, 2016
This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record.This paper studies sliding-mode control of a class of multibody underactuated systems with discontinuous friction presenting on the ...
Liu, Y
core   +1 more source

Observation of Edge‐Confined Acoustic Hyperbolic Polaritons in van der Waals Materials

Advanced Science, Volume 13, Issue 14, 9 March 2026.
This work demonstrates a new type of light wave—edge‐confined acoustic hyperbolic polaritons—in hexagonal boron nitride on gold. These waves travel along crystal edges with nanoscale confinement and strongly interact with molecular vibrations, enabling highly sensitive detection of tiny molecular layers.
Tianning Zhang, Xiaojie Jiang, Xiaosheng Yang, Xinliang Zhang, Peining Li   +4 more
wiley   +1 more source

Influence mechanism of the rubbing of drilling pipe for the stability of hole wall [PDF]

, 2016
The hole wall appears because of the gas drainage of the coal seam, the hole wall is divided for the elastic area and plastic area, according to the elastic mechanics and rock mechanics established borehole wall stress model, caused by gas drilling ...
Chen-xu, L. (LUO), Shi-feng, W. (WANG), Xiao-ming, H. (HAN)   +2 more
core  

Drilling Within the Critical Zone

Hydrological Processes, Volume 40, Issue 3, March 2026.
This review synthesises 30 years of critical zone drilling methodologies for studying subsurface weathering, water storage, and biogeochemical processes. We evaluate drilling techniques, sampling strategies, downhole logging, and long‐term monitoring approaches while addressing contamination control and core preservation challenges.
Amanda Donaldson, Russell P. Callahan, W. Jesse Hahm, David N. Dralle, Anders Noren, Rachel E. Breunig, Berit M. Hudson Rasmussen, Laura V. Krone, Susan L. Brantley, A. Joshua West, Lin Ma, Clifford S. Riebe, Margaret Zimmer, Ashlee Dere, Daniella Rempe   +14 more
wiley   +1 more source

The effect of high-frequency torsional impacts on the dynamic response of a drill string in a stick state

Advances in Mechanical Engineering, 2019
Stick–slip vibration is common in the oil well drilling process and is detrimental to down-hole equipment and drilling efficiency. In recent years, a new type of drilling technology, torsional impact drilling, has been developed to mitigate the stick ...
Liping Tang, Wei He, Xiaohua Zhu
doaj   +1 more source