Structural Design and Test of ROP Improving Tool with Adjustable Impact Frequency
Shiyou jixieRocks below the Permian are less drillable, leading to low rate of penetration(ROP), which can hardly be improved by only applying the drilling tool with single impact frequency.In this study, a ROP improving tool with adjustable impact frequency was ...
Tian Yu +5 more
doaj
PDC Bit Optimization and Application in Panyu Oilfield of the South China Sea
Shiyou jixie, 2016 Panyu Oilfield of the South China Sea is subject to several technical problems.For example, soft and hard formations are repeatedly staggered to possibly damage drill bits and tools; plastic soft clay is prone to bit balling; high requirements are raised
Tian Zhixin, Liu Jun
doaj
What Drives High Penetration Rates of Social Media A Qualitative Comparative Analysis Across Countries [PDF]
, 2022 A. F. M. Jalal Ahamed, Wen Gong
openalex +1 more source
How Fast Does Information Leak out from a Black Hole?
, 1993 Hawking's radiance, even as computed without account of backreaction, departs from blackbody form due to the mode dependence of the barrier penetration factor. Thus the radiation is not the maximal entropy radiation for given energy.
A. A. Starobinsky +31 more
core +1 more source
Structural insights into an engineered feruloyl esterase with improved MHET degrading properties
FEBS Letters, EarlyView.A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa +5 more
wiley +1 more source
Dynamics of Circumferential Torque Hydraulic Shock Generator
Shiyou jixie, 2015 The circumferential torque hydraulic shock generator may effectively inhibit "stuck and slip" during the process of drilling operations.This paper presents the structure and principles of the circumferential torque hydraulic shock generator,and provides ...
Li Meiqiu +4 more
doaj
Evolution of penetration mechanism induced by strain rate effect
EPJ Web of Conferences, 2018 According to the dynamic mechanical properties, in the striking velocity range, the strain rate of the projectile and target caused by penetration can reach 104~106 /s. The strain rate effect increases sharply and then tends to saturation.
Li Gan, Song Chunming, Wang Mingyang
doaj +1 more source
Consumer Learning and Hybrid Vehicle Adoption [PDF]
We study the diffusion of hybrid vehicles among consumers. Using data on sales of 11 different models over seven years, we identify the effect of the penetration rate--total cumulative hybrid sales per capita--on new hybrid purchases.
Heutel, Garth, Muehlegger, Erich
core +1 more source
Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system
FEBS Letters, EarlyView.Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley +1 more source
Structural Design and Performance Analysis of Novel Torsional Impact Tool
Shiyou jixie, 2017 The existing impact and rotary-impact rock breaking technology mostly use the axial impact and the shear action of the PDC bit to achieve high-efficiency rock breaking, but excessive axial force will cause the failure of PDC bit shear force, resulting in
Fu Chuanhong +5 more
doaj