Displacement Monitoring Articles

  • Helium and MRI Rooms Around the World

    Helium gas is something most people feel fairly familiar with.  Children are enthralled with the magical beauty of a floating balloon, watching it reach toward the sky and hoping not to lose their grip on the string.  Helium feels safe, and while people surround themselves with flying wonders filled with this lightweight gas, the real magic of helium is taking ...

  • Numerical analyses of the hangingwall failure due to sublevel caving: study case

    The sublevel caving used in Kiirunavaara mine induces failure and subsidence of the hangingwall. Two sections of the mine were studied by means of numerical analyses. Numerical models were developed using finite element and discrete element codes. The former was applied to calculate the location of new failure surfaces in the hangingwall and to estimate the break angle when mining advances ...


    By Inderscience Publishers

  • Why the use of a CO2 monitor may not be the best solution for protecting workers against leaks from beverage dispensing systems in the fast food industry

    Carbon Dioxide (CO2) is the primary compressed gas used for dispensing beverages at fast food chains. This gas is also used in restaurants, gas stations, and grocery stores. When CO2 leaks into a confined space or basement, it creates a very unsafe environment for employees because it lowers the concentration of breathable oxygen.  History seems to repeat itself all too often while ...

  • The beverage industry`s incorrect way of monitoring for CO2 leaks

    Carbon Dioxide (CO2) is the primary compressed gas used for beverages at major fast food chains. This gas is also used in restaurants, gas stations, and grocery stores. When CO2 leaks into a confined space or basement, this creates a very unsafe workplace for employees by lowering the breathable oxygen. History seems to repeat itself all too often while dealing with CO2. Due to the CO2 leaks ...

  • Rainstore3 insitu testing results

    From 10 February to 17 February 2000 Invisible Structures Inc. (ISI) and Advanced Terra Testing, Inc. (ATT) conducted insitu testing on the Rainstore3 product produced by ISI. ISI excavated the test hole, installed the product per their specifications, and supplied and operated the loading vehicles. ATT installed the load cells and displacement transducers, organized the testing parameters, ...


    By Invisible Structures, Inc.

  • Soil-Geogrid Reinforcement Interaction by Pullout and Direct Shear Tests

    Pullout and direct shear tests have been conducted to investigate the soil-reinforcement interaction behavior in pullout and direct shear mechanisms. An apparatus—discussed in this paper—has been developed that is capable of performing both pullout and direct shear tests. Displacement measurements to monitor dilatancy on the backfill soil during pullout tests are incorporated in the apparatus. ...


    By ASTM International

  • A Multiple Purpose Soil Testing Apparatus

    A relatively compact soil testing system that is capable of performing monotonic/cyclic triaxial and torsional simple shear tests has been developed. A high-torque direct-drive, servo/stepper motor is used to provide the driving force. Under the servo mode, the motor could be controlled to provide a constant torque, which is used in stress-controlled tests. Strain-controlled tests are conducted ...


    By ASTM International

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