Results 71 to 80 of about 912,950 (301)
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
Bayesian prediction of TBM penetration rate in rock mass
Engineering Geology, 2017 Abstract One of the essential tasks in the excavation of tunnels with TBM is the reliable estimation of its performance needed for the planning, cost control and other decision making on the feasibility of the tunneling project. The current study aims at predicting the rate of penetration (RoP) of TBM on the basis of the rock mass parameters ...
Adoko, Amoussou Coffi +2 more
openaire +2 more sources
'Market penetration and pay-back period analysis of a solar photovoltaic system under Indian conditions' [PDF]
The use of pay-back period analysis for economic evaluation of solar photovoltaic (PV) system reinforces the importance of the duration of the system.
Mohan Lal Kolhe
core
The role of intermediate layers in the c-axis conductivity of layered superconductors
, 1997 A simplified model of c axis transport in the high T_c superconductors is presented. Expressions are found for the c axis optical conductivity, the d.c. resistivity, and the c axis penetration depth.
Atkinson +7 more
core +1 more source
Time after time – circadian clocks through the lens of oscillator theory
FEBS Letters, EarlyView.Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo +2 more
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
Research and Development of PDC Bits for Geothermal Well Drilling
Journal of MMIJPolycrystalline diamond compact (PDC) bits, which are widely used in oil and gas well drilling, have begun to be used in geothermal well drilling. Mitsubishi Materials Corporation, K. Maikai Co., Ltd, and National Institute of Advanced Industrial Science
Kuniyuki MIYAZAKI +4 more
doaj +1 more source
The newfound relationship between extrachromosomal DNAs and excised signal circles
FEBS Letters, EarlyView.Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley +1 more source
On the state of low luminous accreting neutron stars
, 2001 Observational appearance of a neutron star in the subsonic propeller state which is a companion of a wind-fed mass-exchange close binary system is discussed.
Arons +18 more
core +1 more source
In situ molecular organization and heterogeneity of the Legionella Dot/Icm T4SS
FEBS Letters, EarlyView.We present a nearly complete in situ model of the Legionella Dot/Icm type IV secretion system, revealing its central secretion channel and identifying new components. Using cryo‐electron tomography with AI‐based modeling, our work highlights the structure, variability, and mechanism of this complex nanomachine, advancing understanding of bacterial ...
Przemysław Dutka +11 more
wiley +1 more source