to make indentations of different dimensions. Thus, Vickers hardness was considered. The Vickers pyramid has a square base with an angle between opposite faces of 1361, so a correlation between the side length of the square (L) and the depth (d) can be computed and is approximately equal to 5 (L¼d  2  tg(1361/2)) (Fig. 3).
Fig. 4 shows the matrix of defects produced in steel, aluminium and copper as shown in micrographs presented in Fig. 4b–d, respectively. Distance between indentations was equal to 300 mm in line and in column. The letters correspond to different defect dimensions (Fig. 4a). This matrix configuration aimed to guarantee that near a small defect there was always a large one to guarantee that the suspension of bacteria that did not entered a small defect, but entered a nearby large one, was not due to a lack of suspension availability, but due to a physical limitation of the technique, namely, size and motility of bacteria, as well as capillarity phenomena. Thus, a detection limit can be estimated.
to make indentations of different dimensions. Thus, Vickers hardness was considered. The Vickers pyramid has a square base with an angle between opposite faces of 1361, so a correlation between the side length of the square (L) and the depth (d) can be computed and is approximately equal to 5 (L¼d  2  tg(1361/2)) (Fig. 3).
Fig. 4 shows the matrix of defects produced in steel,อลูมิเนียมและทองแดง ดังแสดงในรูปที่แสดงใน micrographs 4B และ D ตามลำดับ ระยะห่างระหว่างเยื้องเท่ากับ 300 มิลลิเมตรในบรรทัดและคอลัมน์ ตัวอักษรที่สอดคล้องกับมิติของเสียต่าง ๆ ( รูปที่ 4 ) This matrix configuration aimed to guarantee that near a small defect there was always a large one to guarantee that the suspension of bacteria that did not entered a small defect, but entered a nearby large one, was not due to a lack of suspension availability, but due to a physical limitation of the technique, namely, size and motility of bacteria, as well as capillarity phenomena. Thus,มีขีดจำกัดนะ
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