IMPACT OF USING VIRTUAL AND CONCRETE MANIPULATIVES ON STUDENTS’ LEARNING OF FRACTIONS



Sealing Failure Analysis on V-Shaped Sealing Rings of an Inserted Sealing Tool Used for Multistage Fracturing Processes

The inserted sealing tool is a critical downhole implement that is used to balance the downhole pressure in multistage fracturing operations and prevent fracturing fluid from overflow and/or backward flow.The sealing ring of an inserted sealing tool plays an important role in downhole sealing since a sealing failure would ail the fracturing operati

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Stand-alone tsunami alarm equipment

One of the quickest means of tsunami evacuation is transfer to higher ground soon after strong and long ground shaking.Ground shaking itself is a good initiator of the evacuation from Cosmetic Bag disastrous tsunami.Longer period seismic waves are considered to be more correlated with the earthquake magnitude.We investigated the possible applicatio

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