MECHANOCHEMICAL TRANSFORMATION OF SHUNGITE IN THE DYNAMIC SLIP ZONE

2016 ◽  
Keyword(s):  
Slip Zone ◽  
Mechanochemical Transformation ◽  
Dynamic Slip

Carbonization of Carbonates and Fractionation of Stable Carbon Isotopes in a Dynamic Slip Zone

2020 ◽  
Vol 58 (9) ◽  
pp. 981-993
Author(s):  
Yu. A. Morozov ◽  
V. S. Sevastianov ◽  
A. Yu. Yurchenko ◽  
O. V. Kuznetsova
Keyword(s):  
Carbon Isotopes ◽  
Stable Carbon Isotopes ◽  
Slip Zone ◽  
Stable Carbon ◽  
Dynamic Slip

Study of nanocrystals in the dynamic slip zone

2012 ◽  
Vol 48 (9-10) ◽  
pp. 684-692 ◽  
Author(s):  
G. A. Sobolev ◽  
S. M. Kireenkova ◽  
Yu. A. Morozov ◽  
A. I. Smul’skaya ◽  
V. I. Vettegren ◽  
...  
Keyword(s):  
Slip Zone ◽  
Dynamic Slip

scholarly journals In Situ Shear Test for Revealing the Mechanical Properties of the Gravelly Slip Zone Soil

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6531 ◽  
Author(s):  
Zongxing Zou ◽  
Qi Zhang ◽  
Chengren Xiong ◽  
Huiming Tang ◽  
Lei Fan ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Plastic Deformation ◽  
Shear Test ◽  
Slip Zone ◽  
Three Gorges Reservoir Area ◽  
Silty Clay ◽  
Sigmoid Function ◽  
In Situ Test ◽  
Deformation Stage

Slip zone soil is usually composed of clay or silty clay; in some special geological environments, it contains gravels, which make the properties of the slip zone soil more complex. Unfortunately, in many indoor shear tests, gravels are removed to meet the demands of apparatus size, and the in situ mechanical property of the gravelly slip zone soil is rarely studied. In this study, the shear mechanical property of the gravelly slip zone soil of Huangtupo landslide in the Three Gorges Reservoir area of China was investigated by the in situ shear test. The test results show that the shear deformation process of the gravelly slip zone soil includes an elastic deformation stage, elastic–plastic deformation stage, and plastic deformation stage. Four functions were introduced to express the shear constitutive model of the gravelly slip zone soil, and the asymmetric sigmoid function was demonstrated to be the optimum one to describe the relationship of the shear stress and shear displacement with a correlation coefficient of 0.986. The comparison between the in situ test and indoor direct shear test indicates that gravels increase the strength of the slip zone soil. Therefore, the shear strength parameters of the gravelly slip zone soil obtained by the in situ test are more preferable for evaluating the stability of the landslide and designing the anti-slide structures.

Study of a mechanochemical transformation in iron pyrite

2000 ◽  
Vol 298 (1-2) ◽  
pp. 306-309 ◽  
Author(s):  
J.P Eymery ◽  
F Ylli
Keyword(s):  
Iron Pyrite ◽  
Mechanochemical Transformation

Characteristics of the fault-related rocks, fault zones and the principal slip zone in the Wenchuan Earthquake Fault Scientific Drilling Project Hole-1 (WFSD-1)

2013 ◽  
Vol 584 ◽  
pp. 23-42 ◽  
Author(s):  
Haibing Li ◽  
Huan Wang ◽  
Zhiqin Xu ◽  
Jialiang Si ◽  
Junling Pei ◽  
...  
Keyword(s):  
Wenchuan Earthquake ◽  
Fault Zones ◽  
Slip Zone ◽  
Earthquake Fault ◽  
Scientific Drilling ◽  
The Wenchuan Earthquake ◽  
Drilling Project

scholarly journals The Verdesca landslide in the Agri Valley (Basilicata, southern Italy): a new geological and geomorphological framework

2015 ◽  
Vol 15 (11) ◽  
pp. 2585-2595 ◽  
Author(s):  
E. Gueguen ◽  
M. Bentivenga ◽  
R. Colaiacovo ◽  
S. Margiotta ◽  
V. Summa ◽  
...  
Keyword(s):  
Time Domain ◽  
Southern Italy ◽  
Time Domain Reflectometry ◽  
Slip Zone ◽  
Economic Activities ◽  
The West ◽  
Field Surveys ◽  
Significant Movement ◽  
Translational Slide ◽  
Siliciclastic Sediments

Abstract. A landslide, to the west of Montemurro (a small village in southern Italy), has recently caused damage to buildings and other infrastructure in an urbanized area; as a result the development of new economic activities has been prohibited. The landslide phenomenon started in the last century and has been studied since the 1990s using classical geotechnical methods; however the sliding body continues to move. This paper presents the results of a study carried out using field surveys, geognostic investigations and TDR (time domain reflectometry) measurements in order to reconstruct the stratigraphy of the sediments involved and to further understand the geological and geomorphological context of the slope. This study is part of a larger multidisciplinary project, the results of which will also be presented in this paper. The landslide (rotational slide in the upper sector, developing into a translational slide in the lower part) affects Quaternary continental clastic deposits resting on a bedrock formed by Tertiary siliciclastic sediments of the Gorgoglione Flysch. TDR measurements did not show any significant movement during the period monitored (January 2013–January 2014). Slip zone geometries were hypothesized using inclinometric measurements taken from previous studies, stratigraphic data and geomorphological interpretations of topographic scarps. Feedback from monitoring will confirm this hypothesis.

scholarly journals Voltage Recovery Control Techniques of Grid Connected Variable Speed Wind Turbines at a Short Circuit

2019 ◽  
Vol 8 (2) ◽  
pp. 868-873
Keyword(s):  
Wind Turbine ◽  
Power Quality ◽  
Wind Turbines ◽  
Short Circuit ◽  
System Stability ◽  
Normal Operation ◽  
Pitch Control ◽  
Control Techniques ◽  
Voltage Recovery ◽  
Dynamic Slip

The documented investigation in this paper examines main power quality for wind turbines and its connection with the public grid. This main goal has been to investigate most popular type of wind turbines which are grid connected using doubly-fed induction generators (DFIG) at normal operation, as well as voltage control of these wind turbines after clearing a lines short circuit in the utility grid. This paper introduces the configuration of main portions of grid connected turbines, which have an importance in the wind power plants operation. It also proposes a new compact modeling of these wind turbines, which has a feature that the expressions of most plant portions are free of any complex or details that described in other past models. Most of last models are spotted on the normal operation of single wind turbines, without consideration of gird interaction faults. The proposed control techniques are new combined and concentrated on the voltage recovery, which plays very important role in the power quality and stability of wind turbines plants which are connected with the grid. Net simulation results show that the combination of pitch control and dynamic slip control could to have power system stability efficiently, and restore the voltage to its normal condition. A simulation of wind turbine using pitch control and dynamic slip control are developed by the simulation program is called power system computer aiding design (PSCAD) and carried out the stability investigations respecting to short circuit in external power lines system. After clearing of the fault, the recovery of voltage at the terminals of wind turbine should to rebuild, then the wind power turbine should going to its normal case. Control of the pitch angle or generator slip can adjusting the aerodynamic torque and the electromagnetic torque at the turbine which can be help to recovery the voltage at the terminals of wind turbine. The results of case study simulation are proved that pitch and dynamic slip controls are methods to improve the recovery of voltage effectively and going to the system stability quickly, especially the combined controls of dynamic slip and pitch angel together.

Effects of varying injection rate on dynamic slip nucleation along a frictional weakening fault

2021 ◽  
Author(s):  
Federico Ciardo ◽  
Antonio Pio Rinaldi ◽  
Stefan Wiemer
Keyword(s):  
Boundary Element ◽  
Shear Crack ◽  
Fractured Reservoirs ◽  
Injection Rate ◽  
Numerical Results ◽  
Small Scale ◽  
Rate Variation ◽  
Injection Strategy ◽  
Seismicity Rates ◽  
Dynamic Slip

<div> <p><span>Anthropogenic injection of fluid into tight fractured reservoirs is known to alter the stress state of the Earth`s crust,  inducing micro-seismicity and eventually significant earthquakes. The injection scenario, in terms of injection pressure or injection rate, is one of the key controlling parameters for injection-induced seismicity. Although a number of studies have been carried out on understanding the effects of injection strategy on seismicity rates, less is known about its effect on the nucleation of dynamic slip on a pressurized fault, especially for non-stationary injection protocols.</span></p> </div><div> <p><span>In this contribution we study the effects of injection rate variation on the transition between aseismic and seismic slip along a frictional weakenig fault. Notably, we parametrize the injection strategy by assuming an initial linear increase of injection rate in time, up to a value after which it remains constant. We perform a scalying analysis and identify the governing parameters that control the fault response. We solve numerically the coupled hydro-mechanical problem using a fast boundary element solver for localized inelastic deformations [1]. Upon benchmarking the numerical results with the semi-analytical ones of Garagash and Germanovich [2] for the specific case of constant injection rate, we investigate the effect of injection rate variation on critically stressed and marginally pressurized faults. We derive analytical expressions for nucleation time and we confirm them via numerical results. Furthermore, we present a small scale yielding solution for marginallly pressurized faults and investigate the influence of injection scenario on shear crack run-out distances (when occuring).</span></p> </div><div> <p><span> </span></p> </div><div> <p><strong><span>References   </span></strong></p> </div><div> <p><span>[1] Ciardo, F., Lecampion, B., Fayard, F., and Chaillat, S. (2020), A fast boundary element based solver for localized inelastic deformations, </span><em>Int J Numer Methods Eng</em>. 2020; 1–23.</p> </div><div> <p><span>[2] Garagash, D., and L. N. Germanovich (2012), Nucleation and arrest of dynamic slip on a pressurized fault, <em>J. Geophys. Res</em>., 117, </span>B10310<span>.</span></p> </div>

scholarly journals Investigating the Contact Responses of the Roller Cavity Surfaces in the Compressor Blade Rolling Process

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Qichao Jin ◽  
Wenhu Wang ◽  
Ruisong Jiang
Keyword(s):  
Shear Stress ◽  
Contact Pressure ◽  
Rolling Process ◽  
Compressor Blade ◽  
Rolling Contact ◽  
Slip Zone ◽  
Sliding Velocity ◽  
Forward Slip ◽  
Forming Process ◽  
Forward Slip Zone

The investigation of the contact responses is the key for evaluating the local wear of dies in the plastic forming process. This paper investigated the contact load distributions and evolutions of the roller cavities in the compressor blade rolling process by the FEM. It was the first study to quantify the distributions and evolutions of the contact responses for rolling irregular components. The results indicated that the maximum contact pressure is generally present at the center of the contact interfaces, and the magnitudes of contact pressure decreased with evolution of the blade rolling process. The rolling contact interfaces can be divided into the backward slip zone, the stick zone, and the forward slip zone based on the shear stress distributions. The stick zone was a narrow belt which separated the forward and the backward slip zone, and the shear stress in the stick zone was nearly zero. The shear stress magnitudes in the forward slip zone were smaller than those in the backward slip zone, and the directions of shear stress in forward and backward slip zones were adverse. The magnitudes of shear stress over the forward and backward slip zones decreased with evolution of the blade rolling process. The distributions of local sliding were in a V-shape, the local sliding in the stick zone was nearly zero, and the bigger sliding in backward and forward slip zones was present at the boundaries of rolling entrance and exit sections. The local sliding velocity magnitudes in the backward slip zones were always bigger than those in the forward slip zones, and the magnitudes of local sliding at the rolling entrance sections were bigger than those at the rolling exit sections. In general, the local sliding velocity magnitudes increased firstly and decreased sharply at 2T/3. The current paper develops the distributions and evolutions of contact responses in the blade rolling process. The contact responses can be used for studying the wear of roller cavities to avoid the accuracy inconsistency of the shaped blade.

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