Barite is an important additive material to increase the weight of excavation mud. It has been used extensively in the excavation mud industry. The barite particle sizes used in excavation mud is very important. There is a direct relationship between the amount on the sift of 200 and 325 mesh. By reducing particle sizes of the 200 and 325 mesh, the specific gravity of the barite power increased...

Shipwrecks in deep water are often found by their surface expressions, such as exposed ceramic containers. Fully investigating or excavating those sites, however, requires understanding what is buried beneath, including organic materials and the remains of ship structure. This paper lays out the archaeological and technical justification for a high-frequency, narrow-beam sub-bottom profiler. It...

Introduction In 1752 antiquity hunters were tunneling down into a large villa on a hill overlooking Herculaneum and the Bay of Naples when they made the discovery of manuscripts. This villa probably once belonged to the wealthy Roman aristocrat Lucius Calpurnius Piso Caesoninus, a well-known Roman politician, who was a patron of Epicurean philosophers. The villa was lost from history in A.D. 79...

In Vietnam, the solution of designing and constructing deep foundation pits with geology sandy or clayey sand is very difficult, especially in case soil mix mud. some pits, unreasonable treatment causes bottom plug pit to be pushed up not pump a dried. Solving those problems, this article introduces particular study, sealing for no14 Yen Xa drainage works Jet grouted hydraulic barriers. To trea...

The coral excavating sponge Cliona delitrix is one of the most aggressive and conspicuous excavating sponges on Caribbean reefs. While C. delitrix is very prominent displaying its typical encrusting growth form (β-stage) on the Caribbean island of Bonaire, it is rather elusive and only exhibits a papillated habitus (α-stage) on the neighboring island of Curaçao. Here I document the first two en...

polyanionic cellulose polymer is used as an additive in drilling mud in order to decrease water loss and mudcake- thickness. in this study effect of bulk and nanosize polyanionic cellulose on water loss and mud-cakethickness in mud drilling is investigated. polyanionic cellulose nanoparticles are made by using of ball milling. size of nanoparticles is measured by particle size analyzer. polyani...