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Method for Assessment of Changes in the Width of Cracks in Cement Composites with Use of Computer Image Processing and Analysis

scale-invariant keypoints, International Journal of Computer Vision, 2004, 60 (2), 91-110. [5] KANELLOPOULOS A., QURESHI T.S., AL-TABBAA A., Glass encapsulated minerals for self-healing in cement based composites, Construction and Building Materials, 2015, 98, 780-791. [6] PAWLIK P., MIKRUT S., Wyszukiwanie punktów charakterystycznych na potrzeby zdjęć lotniczych, Automatyka, 2006, 10 (3), 407-411. [7] SZELĄG M., FIC S., Analiza rozwoju spękań klastrowych w zaczynie cementowym modyfikowanym mikrokrzemionką, Budownictwo i

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Reinforcement of Underground Excavation with Expansion Shell Rock Bolt Equipped with Deformable Component

-56. [4] CAMPOLI A., OLDSEN J., WU R., Yielding bolt support for burst prone working, Proceedings of Seventh International Symposium: Rockbolting and Rock Mechanics in Mining, Aachen, 2012, 205-212. [5] CHARETTE F., PLOUFFE M., A new rock bolt concept for underground excavations under high stress conditions, Proceedings of 6th International Symposium on Ground Support in Mining and Civil Engineering Construction, Johannesburg, 2008, 225-240. [6] CHEN Y., LI C.C., Performance of fully encapsulated rebar bolts and D-Bolts under combined

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Powered Roof Support – Rock Strata Interactions on the Example of an Automated Coal Plough System

us to predict the deformation of longwall excavations at the distance of 100 m ahead of the face. The software encapsulates the statistical significance analyses of critical parameters impacting on the support loading ( Table 3 ). These parameters include Table 3 Statistical significance of model parameters. Effect Parameter evaluation: z sigma parameterisation with constraints Acceptance condition: p min ≥24 MPa, p max ≤42 MPa, t p ≤30 min Leg pressure factor Leg pressure, Standard error Leg pressure, t-value Leg

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