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...

INtrODUctION The science of Archaeology has been in existence for a long time and the way an archaeological excavation is conducted hasn't changed much. However, the way archaeological data is recorded has changed dramatically by the progress of technology and the widespread use of computers. Nowadays, almost any archaeological excavation uses databases to record not only the objects which have...

BACKGROUND Whilst being the most prevalent disease worldwide, dental caries is increasingly concentrated in high-risk populations. New caries treatments should therefore be evaluated not only in terms of their cost-effectiveness in individuals, but also their effects on the distribution of costs and benefits across different populations. To treat deep caries, there are currently three strategie...

Abstract—Excavation and retaining walls are of challenging issues in civil engineering. In this study, the behavior of one important type of supporting systems called Contiguous Bored Pile (CBP) retaining wall is investigated using a physical model. Besides, a comparison is made between two modes of free end piles (soft bed) and fixed end piles (stiff bed). Also a back calculation of effective ...

Changes in cultivable flora in dentine samples collected before and after hand excavation were examined in association with clinical status of the cavity surface, light microscopy and scanning electron microscopy (SEM). Thirty-five extracted permanent molar teeth with an occlusal caries lesion were excavated with hand instruments according to the atraumatic restorative treatment (ART) approach....

An archeological excavation is usually a rapidly evolving environment: several factors (weather, costs, permissions) force the work to be concentrated in a few weeks. Moreover, excavating is essentially a mono-directional operation, which constantly modifies the state of the site. Since most of the interpretation is performed in a second stage, it is necessary to collect a massive amount of doc...

The Jinan Jiluo Road Crossing the Yellow River Tunnel North Extension Project will intersect Queshan reservoir, which currently supplies 60% of domestic water in City. During excavation process large-diameter slurry type shield used this project, it may lead to fracturing stratum front face and blow-out from surface if support pressure is too high. leakage pollute reservoir water, safety be thr...

Abstract The mud cake is easily formed during the tunnel boring machine (TBM) excavation in clay soils or rocks containing minerals. Mud will lead to soil disturbance of face, clogging cutterhead and even affect construction efficiency personnel safety. In this study, a discrimination method formation based on temperature was proposed. An online monitoring system designed installed slurry balan...

OBJECTIVE To describe the clinical and imaging findings in patients with focal choroidal excavation. METHODS Retrospective observational case series. The medical records of 12 patients (13 eyes) with focal choroidal excavation were reviewed. Clinical histories and imaging findings (including color photography, fundus autofluorescence imaging, fluorescein angiography, indocyanine green angiogr...