This study focuses on measurements of clastic rocks ranging from 3 Hz up to 500 kHz in the laboratory and their application to well log analysis and a time-lapse study in the North Sea. Measurements of elastic properties over a large frequency spectrum can provide a better understanding of the dispersion and attenuation mechanisms in rocks and help to predict and model these effects. Sandstones...

Dedication To my husband, Craig, who is my earthly rock, and to my son, Joshua, in whose eyes I am reminded that " I can do all things in Christ who gives me strength. " v Acknowledgements The author expresses a sincere thank you to her mentor, Dr. Hirofumi Tanaka, for the privilege of working in his laboratory and assistance in gaining the necessary skills to become an independent researcher. ...

We propose a chemo-mechanical model based on stress-dependent recruitment of myosin motors to describe how the contractility, polarization and strain in cells vary with the stiffness of their surroundings and their shape. A contractility tensor, which depends on the distribution of myosin motors, is introduced to describe the chemical free energy of the cell due to myosin recruitment. We explic...

We recently identified a novel human protein kinase, p160 ROCK, as a putative downstream target of the small GTPase Rho. Using the human ROCK cDNA as a probe, we isolated cDNA of two distinct, highly related sequences from mouse libraries. One encoded a mouse counterpart of human ROCK (ROCK-I), and the other encoded a novel ROCK-related kinase (ROCK-II). Like ROCK/ROCK-I, ROCK-II also bound to ...

the track stiffness experienced by a train will vary along the track. sometimes the stiffness variation may be very large within a short distance. one example is when an unsupported sleeper is hanging in the rail. track stiffness is then, locally at that sleeper, very low. at insulated joints the bending stiffness of the rail has a discontinuity implying a discontinuity also of the track stiffn...

In engineering practice, numerical simulations of deep tunneling are commonly based on isotropic linear–elastic perfectly plastic rock models. Rock, however, exhibits highly nonlinear and distinct direction-dependent mechanical behavior. The former is characterized by irreversible deformation, associated with strain hardening softening, the degradation stiffness; latter due to inherent structur...

The occurrence regularity of the coal mine earthquake under influence hard roof, fault, and mining was studied by theoretical analysis, field investigation, monitoring data analysis for phenomenon rock burst induced earthquakes. dissipation characteristics energy propagation considering a hypocenter scale were described, response analyzed. two principles fractured type earthquakes three princip...

This paper presents a three-dimensional analytical solution for deformation and stress change inside outside porous layer of rock subjected to prescribed axisymmetric disturbance in the pore fluid pressure. The is confined between two impermeable layers rock. Different mechanical moduli are considered confining strata. derived from Navier's equations static equilibrium while considering continu...

Drilling into a rock massif is energetically extremely consumptive process. Hence the optimization of drilling regime with objective of energy consumption minimization, is very important. Proposed article discusses partial problem of this problem. During the drilling process it is useful to know the drilled rock type, whereas to particular drilled rock needs convenient drilling regime, which is...