The rotation of a ship’s propeller can accelerate the water flow around it,which puts pressure on seabed *** pressure on the seabed can significantly trigger erosion and sedimentation of coastal *** the impact that c...
The rotation of a ship’s propeller can accelerate the water flow around it,which puts pressure on seabed *** pressure on the seabed can significantly trigger erosion and sedimentation of coastal *** the impact that can be caused,the ship’s propeller rotation limit needs to be determined to avoid damage to the aquatic *** research determines the threshold of ship propeller rotation based on the water flow velocity *** has been carried out at the Hydrodynamics Laboratory on several variations of propeller rotation Rrmp(r/min) and water depth using empirical approaches,numerical simulations,and scale model *** based on general standard criteria for erosion and sedimentation shows that a propeller with a diameter (Dp) of 1.5 m is safe for propeller rotation at 25 r/min at all water ***,the propeller rotation of 75 r/min is safe for a distance between the propeller axis and the bottom of the water equal to ***,rotation at 120 r/min is safe at a minimum distance of 1.5 Dp,and 230 r/min is safe for a minimum distance of 2.0 *** propeller rotation threshold criteria are essential to determining the new under-keel clearance for environmentally friendly ship *** values vary based on seabed particle type and water depth.
OBJECTIVES: To estimate the rates of and identify risk factors for disease in women with atypical glandular cells of undetermined significance (agus). METHODS: From 1998-2001, 477 pap tests at Hartford Hospital were c...
详细信息
OBJECTIVES: To estimate the rates of and identify risk factors for disease in women with atypical glandular cells of undetermined significance (agus). METHODS: From 1998-2001, 477 pap tests at Hartford Hospital were classified as agus and met the inclusion criteria of this study. Findings were evaluated for 2 years from the initial test. Disease was defined as histology results with a finding of high-grade squamous intraepithelial lesion or greater. RESULTS: Disease was diagnosed in 9%of the women, including malignancy in 3%. Women with malignant-appearing agus pap tests had a higher rate of disease (29%) than women with benign-appearing (5%, p pecified agus pap tests (13%, p agus pap tests. Women aged less than 35 years were more likely to have disease than women aged 35 years or older (p persistent agus pap tests had a 31%rate of disease. The rate of disease among women with agus pap tests collected by liquid-based cytology was 11%, compared with 6%among samples collected by the conventional method. CONCLUSION: These data suggest that women with atypical glandular cells are at substantial risk for dysplasia and malignancy. The rate of disease varies with the method of pap test collection, age, presence of persistent agus pap tests, and agus subclassification.
暂无评论