scholarly journals A New Plugging Technology and Its Application for the Extensively Collapsed Ore Pass in the Non-Empty Condition

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1599
Author(s):  
He Chen ◽  
Shibo Yu ◽  
Zhixiu Wang ◽  
Ye Yuan
Keyword(s):  
Empty Condition ◽  
Ore Pass

scholarly journals The Deltah Lab, a New Multidisciplinary European Facility to Support the H2 Distribution & Storage Economy

2021 ◽  
Vol 11 (7) ◽  
pp. 3272
Author(s):  
Sara Stelitano ◽  
Alberto Rullo ◽  
Luigi Piredda ◽  
Elisabetta Mecozzi ◽  
Luigi Di Vito ◽  
...  
Keyword(s):  
Storage Capacity ◽  
Renewable Energy Sources ◽  
Energy System ◽  
System Transformation ◽  
Life Tests ◽  
Storage Methods ◽  
Complementary Techniques ◽  
H2 Effect ◽  
Empty Condition ◽  
New Facility

The target for European decarburization encourages the use of renewable energy sources and H2 is considered the link in the global energy system transformation. So, research studies are numerous, but only few facilities can test materials and components for H2 storage. This work offers a brief review of H2 storage methods and presents the preliminary results obtained in a new facility. Slow strain rate and fatigue life tests were performed in H2 at 80 MPa on specimens and a tank of AISI 4145, respectively. Besides, the storage capacity at 30 MPa of a solid-state system, they were evaluated on kg scale by adsorption test. The results have shown the H2 influence on mechanical properties of the steel. The adsorption test showed a gain of 26% at 12 MPa in H2 storage with respect to the empty condition. All samples have been characterized by complementary techniques in order to connect the H2 effect with material properties.

Application of Numerical and Block Geomechanical Modelling to Determine Parameters of Large-Section Chambers

2021 ◽  
pp. 127-131
Author(s):  
M.A. Sonnov ◽  
A.V. Trofimov ◽  
A.E. Rumyantsev ◽  
S.V. Shpilev
Keyword(s):  
Rock Mass ◽  
Strain State ◽  
Stress And Strain ◽  
Underground Structures ◽  
Geomechanical Model ◽  
Principal Stresses ◽  
Mine Support ◽  
History Of ◽  
Crushing Plant ◽  
Ore Pass

The study is exemplified by complex workings of a main ore pass that include a variety of underground structures, usually with unique dimensions which depend on the function and size of the equipment placed. The technical solutions for the underground crushing plant and associated structures envisage construction of chambers with the height of up to 35 m and the width of up to 20 m at the depths exceeding 800-1000 m. Such conditions call for a closer attention to be paid to the mine support parameters, especially the bolting depth. A block geomechanical model was designed in the Micromine Mining Software for the rock mass of the new main ore pass. Geotechnical boreholes logs and results of physical and mechanical rock tests were used as the input data for the model. Four domains were identified in the block geomechanical model for subsequent numerical modelling. A 3D model of the stress-and-strain state of the rock mass was made using the CAE Fidesys software based on the Micromine wire-frame model of the main ore pass. The history of the rock mass incremental loading was reconstructed for correct simulation of its stress-and-strain state. Prior to the excavation, the rock mass is pre-stressed by the weight of the rock strata. The excavation phase was then simulated in the stepwise manner. An array of points with the values of maximum principal stresses was downloaded from the numerical model post-processing program and interpolated into the block geomechanical model to refine the SRF parameter of the Barton's Q rating. Based on the obtained Q values, the mine support parameters for chambers were determined using the Barton, Hutchinson and Potvin empirical methods.

Performance of a Track Geometry Car-Based Real-Time Dynamics Simulator Using Multiple Vehicle Types

2003 ◽  
Author(s):  
Clifford S. Bonaventura ◽  
Joseph W. Palese ◽  
Allan M. Zarembski
Keyword(s):  
Real Time ◽  
Dynamic Model ◽  
Dynamic Simulation ◽  
Simulation System ◽  
Time Dynamic ◽  
Track Geometry ◽  
Time Dynamics ◽  
Rail Vehicle ◽  
Empty Condition ◽  
Traveling Speed

A real-time dynamic simulation system designed to identify sections of track geometry that are likely to cause unsafe rail vehicle response is discussed. Known as TrackSafe, this system operates onboard a track geometry vehicle where the geometry measurements are passed as inputs to the dynamic model of one or more rail vehicle types. In order to comprehensively analyze the effect of the existing geometry on rail vehicle behavior, the system is capable of simultaneously simulating the response of several vehicle models, each over a range of traveling speeds. The resulting response predictions for each modeled vehicle and each simulated traveling speed are used to assess the track geometry condition and to identify locations leading to potentially unsafe response. This paper presents the latest work in the development of TrackSafe, specifically, the development and testing of eight new vehicle models is presented. The new car types modeled include a box car, flat car, and both a long and short tank car. Each can be simulated in a fully loaded or empty condition. Accuracy of the models is discussed in detail.

scholarly journals Study on Parameters of a New Gas–Water Spray in Ore Pass Dedusting Based on Experiment and Numerical Simulation

ACS Omega ◽  
2020 ◽  
Vol 5 (35) ◽  
pp. 21988-21998
Author(s):  
Yapeng Wang ◽  
Zhongan Jiang ◽  
Feng Xu ◽  
Jiuzhu Wang ◽  
Guoliang Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Water Spray ◽  
Ore Pass

Digital surface modeling of an ore pass to reveal orientation of principal stresses and effect of rock fracturing

2020 ◽  
pp. 28-32
Author(s):  
M. P. Sergunin ◽  
◽  
T. P. Darbinyan ◽  
S. Yu. Shilenko ◽  
I. P. Grinchuk ◽  
...  
Keyword(s):  
Surface Modeling ◽  
Rock Fracturing ◽  
Principal Stresses ◽  
Ore Pass

Response to Graded Exercise Testing in Patients Treated with CAPD

1984 ◽  
Vol 4 (2_suppl) ◽  
pp. 94-97 ◽  
Author(s):  
P.L. Painter ◽  
D. Messer ◽  
C. Widener ◽  
S.W. Zimmerman
Keyword(s):  
Blood Pressure ◽  
Exercise Tolerance ◽  
Maximal Oxygen Consumption ◽  
Systolic Pressure ◽  
Dynamic Exercise ◽  
Exercise Session ◽  
Graded Exercise Testing ◽  
Graded Exercise ◽  
Blood Pressure Responses ◽  
Empty Condition

Exercise tolerance in patients treated with CAPD is low compared to normals, however comparable to most studies of patients treated with hemodialysis. Blood pressure responses to graded exercise in the CAPD patients are abnormal, with dramatic yet non-symptomatic decreases in systolic pressure. In three patients tested with and without dialysate present in the abdomen, blood pressure responses were more appropriate (no fall in systolic pressure) in the empty condition. Recommendations at this time for exercise training for these patients is walking a minimum of three days per week at an intensity of 65–80% of maximal oxygen consumption (or below which any fall in systolic blood pressure occurs), working up to 30 minutes per exercise session. Patients exhibiting abnormal blood pressure responses to graded exercise should exercise with no fluid in the abdomen. Exercise tolerance in renal patients treated with hemodialysis has been reported to be low (1–4). A goal of CAPD is to allow the patient to be more active, however, little is known about the effect of CAPD on exercise tolerance and hemodynamics during dynamic exercise. The present study was designed to quantitate exercise tolerance in patients treated with CAPD and evaluate heart rate, electrocardiogram, and blood pressure responses to graded dynamic exercise.

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