Origin of MeV ion irradiation-induced stress changes in SiO2

2000 ◽  
Vol 88 (1) ◽  
pp. 59-64 ◽  
Author(s):  
M. L. Brongersma ◽  
E. Snoeks ◽  
T. van Dillen ◽  
A. Polman
Keyword(s):  
Ion Irradiation ◽  
Induced Stress ◽  
Stress Changes

How to exploit ion-induced stress relaxation to grow thick c-BN films

2002 ◽  
Vol 74 (3) ◽  
pp. 489-492 ◽  
Author(s):  
P. Ziemann ◽  
H.-G. Boyen ◽  
N. Deyneka ◽  
P. Widmayer ◽  
F. Banhart
Keyword(s):  
Stress Relaxation ◽  
Compressive Stress ◽  
Ion Irradiation ◽  
Cubic Phase ◽  
Medium Energy ◽  
High Quality ◽  
Induced Stress

A recently developed procedure is reviewed allowing thick (>1 mm), high-quality c-BN films (>80 % c-BN) to be grown. It is based on the observation that compressive stress inevitably present in such films can be released by medium-energy (some hundred keV) ion irradiation without destroying the cubic phase.

A note on induced stress changes in hydrocarbon and geothermal reservoirs

1998 ◽  
Vol 289 (1-3) ◽  
pp. 117-128 ◽  
Author(s):  
Paul Segall ◽  
Shaun D. Fitzgerald
Keyword(s):  
Geothermal Reservoirs ◽  
Induced Stress ◽  
Stress Changes

scholarly journals Predator-induced stress changes parental feeding behavior in pied flycatchers

2010 ◽  
Vol 22 (1) ◽  
pp. 23-28 ◽  
Author(s):  
Vallo Tilgar ◽  
Kadri Moks ◽  
Pauli Saag
Keyword(s):  
Feeding Behavior ◽  
Induced Stress ◽  
Parental Feeding ◽  
Stress Changes

MULTISTAGE HYDRAULIC FRACTURING WITH PRODUCTION INTERVALS—A PROMISING TECHNOLOGY FOR RESERVOIRS SUBJECT TO REVERSE FAULTING STRESS REGIMES

2006 ◽  
Vol 46 (1) ◽  
pp. 89
Author(s):  
M.K. Rahman
Keyword(s):  
Stress State ◽  
Hydraulic Fracturing ◽  
Basic Mechanism ◽  
Deformation Analysis ◽  
Small Scale ◽  
Stress Regime ◽  
Induced Stress ◽  
Stress Changes ◽  
Reverse Faulting ◽  
Reservoir Conditions

The performance of hydraulic fracturing technology has not been so promising for some Australian tight-gas reservoirs. The existence of reverse faulting stress regimes (i.e. the vertical stress is the minimum one) in these reservoirs is found to be one reason among many others. Previous studies have established that the vertical hydraulic fracture initiated from a vertical well in a reverse faulting stress regime severely turns and twists to become horizontal while fracturing fluid is injected for further propagation of the fracture. This severely turned and twisted fracture impedes the fluid and proppant (engineered sand grains) injection and thus the fracturing job results in a short and constricted fracture. This is considered to be one of the major reasons for premature screen-outs that occur at extremely high-pressure on many occasions in the field, and the subsequent disappointingly low production rates. The aim of this paper is to present the results of an investigation with a model-scale gas reservoir to avoid this problem by carrying out the fracture treatments in a number of stages with production intervals. The basic mechanism that would allow the growth of a long, planar, productive fracture in such a manner is the production-induced stress change around the fracture tip. A simplified propped fracture configuration is modelled in a hypothetical small-scale reservoir with idealistic material properties. Production is simulated in time by varying different parameters and the production-induced stress changes are characterised by coupled fluid flow and deformation analysis. It is found from parametric results that the non-uniform reservoir pressure depletion induces a suitable stress state at the fracture tip for further planar propagation. The duration of production to induce the suitable stress state is found to be dependent on a number of parameters. The paper also highlights the implications and limitations of the concept for hydraulic fracturing in the mentioned reservoir conditions, and discussed further research directions.

Seismic hazard induced by mechanically interactive fault segments

1993 ◽  
Vol 83 (2) ◽  
pp. 436-449
Author(s):  
C. Allin Cornell ◽  
Shen-Chyun Wu ◽  
Steven R. Winterstein ◽  
James H. Dieterich ◽  
Robert W. Simpson
Keyword(s):  
Final Section ◽  
Three Dimensional ◽  
Earthquake Risk ◽  
Physical Interaction ◽  
Earthquake Recurrence ◽  
Induced Stress ◽  
Stress Changes ◽  
Temporal And Spatial ◽  
Gross Behavior ◽  
Analytical Expressions

Abstract This paper presents a phenomenological stochastic model for earthquake recurrence processes involving physical interaction among fault segments. Slip on one segment may reduce (or increase) the time to the next event on another segment or possibly induce an immediate slip on that segment as well. The gross behavior of this model is first observed through simulations; temporal and spatial disorder are observed even when the stochastic aspects are minimized. To estimate the strength of these interactions, we derive factors from the output of three-dimensional elastic dislocation analyses, relating induced stress changes to temporal changes in next-event dates. In a final section, we derive approximate analytical expressions and numerical results for future probabilistic earthquake risk and site hazard, conditional on the elapsed times since events on all relevant fault segments and on the number of events since that may have caused stress changes (interactions).

UV-induced stress changes in phosphorous-doped fibers drawn at different drawing tensions

2003 ◽  
Author(s):  
F. Dürr ◽  
H. G. Limberger ◽  
R. P. Salathé ◽  
F. Cochet ◽  
A. A. Rybaltovsky ◽  
...  
Keyword(s):  
Induced Stress ◽  
Stress Changes ◽  
Doped Fibers
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