نتایج جستجو برای: rotational abrasion test
تعداد نتایج: 844310 فیلتر نتایج به سال:
Small mammals play important roles in many ecosystems, and understanding their response to disturbances such as cattle grazing is fundamental for developing sustainable land use strategies. However, how small mammals respond to cattle grazing remains controversial. A potential cause is that most of previous studies adopt rather simple experimental designs based solely on the presence/absence of...
The piston ring which prepares mechanical sealing of a combustion chamber, should have significant abrasion resistance and less friction loss, using appropriate ring coating. The coating widely used is CrN, because of its good abrasion resistance at room temperature. However, it suffers from some shortcomings, such as high abrasion rate at temperatures above 200°C and lack of self-lubricating p...
Ferritic stainless steels are widely used in equipment, including parts in turbines, electrical industries, aerospace, automotive and decorating industries. One of the problems with this type of steels is their low wear resistance. One of the ways to overcome this problem is to apply a wear-resistant coating on the surface of steel. In this research, nickel phosphorus-titanium oxide coating was...
OBJECTIVE Bioactive glass air abrasion is a conservative technique to remove initial decalcified tissue and caries. This study examined the shear bond strength of composite resin to sound and decalcified enamel air-abraded by bioactive glass (BAG) or alumina using etch-and-rinse and self-etch adhesives. MATERIALS AND METHODS Forty-eight permanent molars were root-amputated and sectioned mesio...
OBJECTIVES The aim of this study was to investigate the effects of erosion and toothbrush abrasion on different restorative materials and human enamel. METHODS Human enamel and 5 kinds of tooth-colored restorative materials were used. The restorative materials included three composite resins (Filtek Silorane, Tetric EvoCeram, and Tetric EvoFlow), a polyacid-modified composite (Dyract Extra), ...
one arm. The dry proteins are dissolved in weak caustic soda and a drop placed on the abrasion. The test is complete in half an hour. An urticarial wheal with an erythematous blush around constitutes a positive reaction. Out of nearly 800 cases suffering from asthma or hay fever 200 positive reactions were obtained. Of these 28 reacted positively to some animal emanation. The largest number of ...
Inner Mongolia is located in the north of China, where the development of wind power industry is outstanding. Because of the surrounding environment’s destruction by frequent sandstorm phenomena in recent years, wind fan blades are severely damaged. The purpose of this paper is to use PLC and touch screen to realize quantitative content of sediment erosion wear in accurate control. The whole te...
A 54-year-old man with severe left upper extremity pain presented to the emergency department 1 day after a minor abrasion to the forearm. Physical examination of the extremity revealed warmth, erythema, exquisite tenderness, blue/violet skin discoloration, and tense bullae containing serous fluid. Systemically, the patient was hypotensive, tachycardic, febrile, and had a white blood cell count...
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