Results 71 to 80 of about 69,267 (280)

Recent advances in multifunctional soft robots: A materials–structures–systems co‐design perspective for synergistic integration

FlexMat, EarlyView.
Abstract Soft robots, engineered from highly compliant materials, offer superior adaptability and safety in unstructured environments compared to their rigid counterparts. Recent advancements, fueled by bio‐inspiration and material programmability, have led to the rapid co‐evolution of their core modules: actuation, sensing, protection, energy, and ...
Qiulei Liu, Zicao Peng, Chong Sun, Haitao Yang   +3 more
wiley   +1 more source

Research on the Influence of Deep-Water Drilling Risers on Drillstring Motion Trajectory and Vibration Characteristics

Machines
The swing of the riser in deep-water drilling can significantly impact the drill string. In this study, we establish a riser model that considers the combined disturbance of periodic dynamic wind and wave loads. By coupling it with the drill string model,
Weiguo Hai, Yingming He, Qilong Xue
doaj   +1 more source

Analysis of longitudinal, torsional and bending vibrations of drill string [PDF]

, 2013
The paper considers longitudinal, torsional and bending vibrations of the drill string that occur during the bottom-hole deepening. The equations are presented that show the possibility of applying vibration velocity to evaluate the strength and ...
Hohol, V. I., Ohorodnikov, P. I., Svtlytskyi, V. M.   +2 more
core  

The behavior of enclosed-type connection of drill pipes during percussive drilling [PDF]

, 2015
Percussion drilling is the efficient method to drill small holes (>= 70 mm) in medium-hard and harder rocks. The existing types of drill strings for geological explorations are not intended for strain wave energy transfer. The description of the improved
Saruev, Lev Alekseevich, Shadrina, Anastasiya Viktorovna   +1 more
core   +1 more source

Stress Analysis on Drilling String Vibration in Gas Drilling

Energy Procedia, 2012
AbstractUsing the finite element method, attempting to solve the serious drilling tools failure in gas drilling, this paper modelled the transient response of string vibration, and worked out the distribution regularity of the transient stress at two different drilling states: gas and mud drilling.
Jianhong, Fu, Kexiong, Song, Zhi, Zhang, Dezhi, Zeng, Fei, Liu, Xin, Xie, Xin, Zheng   +6 more
openaire   +1 more source

Drought Risk in Mango and Avocado Orchards: Insights Into Plant Water Relations and Irrigation‐Related Agronomic Solutions

Irrigation and Drainage, EarlyView.
ABSTRACT Climate change is making water availability more uncertain, with growing consequences for the productivity and long‐term sustainability of tropical and subtropical fruit orchards. Mangifera indica L. and Persea americana Mill. both require large amounts of water to sustain growth and productivity.
Eleonora Cataldo
wiley   +1 more source

Побудова математичної моделі компенсатора вертикальних переміщень бурильної колони підкронблочного типу [PDF]

, 2014
Буріння свердловин в умовах надглибокого моря має низку особливостей в порівнянні із аналогічним процесом на суші, основною із яких є неможливість забезпечення стаціонарного положення бурової установки над свердловиною внаслідок її хитавиці.
Слабий, О. О.
core  

A REVIEW DYNAMIC VIBRATION ON DRILL STRING IN DRILLING OPERATION

Sebatik, 2019
For decades, researchers have investigated the phenomenon of vibrations in drilling activities. One of the interesting things is the vibration in the drillstring. Vibration might be caused by Interfere with each other between the drilling mud and drilling string, contact forces between the drillstring and wellbore, and interfere with each other between
Hasan Basri, Afriansyah Afriansyah
openaire   +2 more sources

Deliberate Practice Supervision to Enhance the Effectiveness of Behavioral Activation for Depression: A Case Study

Journal of Clinical Psychology, Volume 81, Issue 6, Page 526-537, June 2025.
ABSTRACT Deliberate Practice (DP) is a model of behavioral skill acquisition structured by several key tasks. The past decade has shown a consistent growth in interest in this form of learning for psychotherapy skills, with promising research suggesting DP training is superior to traditional learning methods of psychotherapy. This paper presents a case
Dan Sacks
wiley   +1 more source

Natural Frequency Analysis of a Stepped Drill String in Vertical Oil Wells Subjected to Coupled Axial–Torsional–Lateral Vibrations

Energies
Drilling oil and gas wells is a complex process that requires a combination of several parameters to dig into the ground. Inappropriate drilling parameter settings and reaction forces can lead to unwanted vibrations, which can negatively impact the drill
Mohamed Zinelabidine Doghmane
doaj   +1 more source