Results 101 to 110 of about 2,424 (251)

Validation of Aortic Blood Flow Simulations During Extracorporeal Circulation Using Phase Contrast Magnetic Resonance Imaging

Artificial Organs, EarlyView.
This is the first study assessing in vivo blood flow profiles during extracorporeal circulation (ECC) scenarios. Magnetic resonance imaging data served for the calibration of computational fluid dynamics algorithms, enabling accurate replication of the hemodynamic conditions.
Anna Kathrin Assmann, Sinje Reimers, Jonah S. Schrauder, Lei Qu, Xiangge Yin, Amir Moussavi, Artur Lichtenberg, Susann Boretius, Michael Neidlin, Alexander Assmann   +9 more
wiley   +1 more source

Study on Drill String Fatigue Life in Deepwater Drilling

Shiyou jixie, 2016
Dynamic response of the deepwater drilling platform increases alternating loads of the drilling string.As a consequence,the calculation of drill string fatigue life becomes more complicated.By using the numerical simulation method,a method for studying ...
Wang Jiajia, Chen Jianmin
doaj  

Study on Mechanism of Stick–Slip Vibration Based on Torque Characteristics of PDC Bit

Applied Sciences
Stick–slip vibration (SV) of drill string systems is the main cause of fatigue failure of PDC bits under complex drilling conditions. Exploring its mechanism is helpful for identifying the causes of bit failure and developing preventive measures to ...
Lijun Li, Chunliang Zhang, Aixuan Wu
doaj   +1 more source

Neural Networks and Multivariate Analysis Based on Geochemical Data to Determine Stone Provenance From Ancient Calabrian Quarries (Southern Italy)

Archaeometry, EarlyView.
ABSTRACT This study shows an innovative approach to determine the origin of some Calabrian rocks quarried used in ancient times. Twenty‐five quarries, distributed in all the Calabrian provinces (Southern Italy), were studied and sampled. Ten samples were taken from each quarry, for a total of 250 samples.
Domenico Miriello, Stefano Columbu, Raffaella De Luca, Marco Lezzerini, Mirco Taranto, Fabrizio Antonelli   +5 more
wiley   +1 more source

Early Inspection of Drill String Fatigue Damage Based on Metal Magnetic Memory Method

Shiyou jixie, 2017
Drill string fracture frequently occurred during drilling operation seriously affected the exploration and development of oil and gas resources.To address the issue,the metal magnetic memory (MMM) detection technique was applied to the drill string ...
Hu Zhibin, Fan Jianchun, Cheng Caixia, Su Xuemei, Wu Jiafeng, Liu Shujie, He Yingming   +6 more
doaj  

Numerical Investigation of the Nonlinear Drill String Dynamics Under Stick–Slip Vibration

Vibration
This paper presents a comprehensive analysis of the influence of rotary table velocity, weight-on-bit, and viscous damping on the drill string stick–slip vibration.
Mohammad Javad Moharrami, Hodjat Shiri, Clóvis de Arruda Martins   +2 more
doaj   +1 more source

Importance of drill string assembly swivel in horizontal drilling

Acta Montanistica Slovaca, 2006
A part of the drill string – the swivel (rotational connector) – accomplishes an important task in the horizontal drilling. Its malfunctioning makes it impossible to draw in ( install) large diameter and length pipelines. The causes of the connector break-down during the horizontal drilling are investigated in the paper.
Edmund Tasak, Jan Artymiuk, Marek Capik, Stanislaw Bednarz   +3 more
openaire   +1 more source

A systematic review of generative AI in education: Empirical insights from a human–AI interaction perspective

British Journal of Educational Technology, EarlyView.
Abstract With the increasing application of GenAI in education, researchers and practitioners are paying more and more attention to its effectiveness and impact in teaching and learning. This can be evidenced by the increasing number of literature reviews on this topic published in recent years.
Zhiping Liang, Kaixun Yang, Lele Sha, Dragan Gašević, Lixiang Yan, Guanliang Chen   +5 more
wiley   +1 more source

Test on Bending Fatigue Damage of Full-size Drill String

Shiyou jixie, 2017
In the past, the study on the fatigue damage of drill string was mostly modeling or small-scale test, which could not accurately represent the fatigue damage of full-bore drill string.Based on the four-point bending fatigue test, taking the full-size ...
Cheng Caixia, Fan Jianchun, Hu Zhibin, Gao Weijun, Wu Jiafeng, Liu Shujie, He Yingming   +6 more
doaj  

Dynamic Characteristics of Horizontal Drilling with Flexible Drill String Based on ABAQUS Explicit Dynamics

Shiyou jixie
During the drilling of ultrashort-radius radial horizontal well with flexible drill string， the vertical shift of wellbore trajectory affects the encountering rate of target points.
Liu Xin Huang Zhongwei Wu Xiaoguang Li Gensheng Shi Huaizhong Wang Jiarui Wang Minghao, Huang Zhongwei, Wu Xiaoguang, Li Gensheng, Shi Huaizhong, Wang Jiarui, Wang Minghao   +6 more
doaj   +1 more source