Results 71 to 80 of about 16,082 (297)
Numerical Simulation on Rock Breaking of PDC Bit during Rotary Steerable Drilling
Shiyou jixie, 2021 When conventional PDC bits are used with rotary steerable tools, problems such as insufficient buildup rate and poor stability may occur, which seriously affect the normal operation of rotary steerable drilling systems.
He Wenhao +5 more
doaj
Retrieving virtual reflection responses at drill-bit positions using seismic interferometry with drill-bit noise [PDF]
, 2015 In the field of seismic interferometry, researchers have retrieved surface waves and body waves by cross-correlating recordings of uncorrelated noise sources to extract useful subsurface information.
Liu, Yi +3 more
core +1 more source
Advanced Materials Interfaces, EarlyView.A multifunctional heparinized polyamide membrane embedded with graphene quantum dots (GQDs) and hyperbranched polyethyleneimine (HPEI) is engineered for efficient bilirubin removal via a one‐step anticoagulation–adsorption process. The membrane demonstrates enhanced hemocompatibility, prolonged clotting times, and high bilirubin adsorption capacity ...
Abdur Rehman Mushtaq Ahmad +6 more
wiley +1 more source
STRUCTURAL OPTIMIZATION AND FATIGUE LIFE STUDY OF AIR HAMMER BIT
Jixie qiangduDue to the low fatigue life of the air hammer bit in the drilling process, the drilling efficieney is greatly reduced and the drilling cost is increased.
FENG ChunYu +5 more
doaj
Study on Dynamic Characteristics of drill String-drill Bit-rock System
Shiyou jixie, 2017 Drill bit, drill string and rock system as a whole, has coupled and interacted dynamic characteristics, which is neglected in most of researches. In view of this, considering the coupling of axial and lateral torsion of the lower drilling tool and the ...
Hu Zhiqiang +3 more
doaj
Study on Rock Breaking Characteristics of a Hybrid Bit
Shiyou jixie, 2020 Existing conventional PDC and roller bits are unable to meet the rock breaking requirements in deep and hard formations, difficult-to-drill formations and soft and hard formations.
吴泽兵 +4 more
doaj
Advanced Materials Interfaces, EarlyView.An all‐in‐fiber broadband polarization photodetector is demonstrated by integrating a PdSe2/2H‐MoTe2 van der Waals heterostructure onto a fiber endface. The device exhibits broadband response spanning 532 nm to 1630 nm, a fast response time of 59 µs, and a polarization ratio of 1.99. This work demonstrates a promising hardware strategy for polarization
Zexing Zheng +11 more
wiley +1 more source
Coherent interferometry migration for hard rock diamond drill-bit seismic [PDF]
, 2014 We use the direct wave interferometry migration with coherency measurement to image the diamond drill-bit. The success of such imaging can prove if the direct waves from the drill-bit can be detected.
Sun, Bai Chun +7 more
core +1 more source
Advanced Materials Technologies, EarlyView.This review explores advances in wearable and lab‐on‐chip technologies for breast cancer detection. Covering tactile, thermal, ultrasound, microwave, electrical impedance tomography, electrochemical, microelectromechanical, and optical systems, it highlights innovations in flexible electronics, nanomaterials, and machine learning.
Neshika Wijewardhane +4 more
wiley +1 more source
Alteration of the Thrust Force Versus Number of Drill Bit Usage in Cortical Bone Drilling
Journal of Orthopedic and Spine Trauma, 2016 Background: Bone drilling is a common step in orthopedic surgery. Thrust force is one of the most important parameters that can influence the quality of bone drilling.
Mohammad Javad Ein Afshar +3 more
doaj