Abstract: A spunbond nonwoven fabric includes hollow polymeric multicomponent fibers. The spunbond nonwoven fabric has a thickness of at least 1 mm. The thickness of the spunbond nonwoven fabric is according to DIN EN ISO 9073-2:1997-02. The spunbond nonwoven fabric may have a thickness according to DIN 9073-2/1997 in the range of 1 to 25 mm.

Abstract: An automatic racket stringing system includes: two lens modules, respectively shooting a racket thread hole on a racket at a first preset position from different two angles, and the lens modules are based on the angles and determine a first relative coordinate of the racket line hole through a triangulation method; and a control unit controls a robotic arm to grab the racket from an initial position and move the racket to the first preset position; the control unit controls the robotic arm to a second preset position clamps a first end of a racket line, and when the first end of the racket line extends a preset length, it is cut by the robotic arm.

Abstract: An automatic racket stringing system includes: two lens modules, respectively shooting a racket thread hole on a racket at a first preset position from different two angles, and the lens modules are based on the angles and determine a first relative coordinate of the racket line hole through a triangulation method; and a control unit controls a robotic arm to grab the racket from an initial position and move the racket to the first preset position; the control unit controls the robotic arm to a second preset position clamps a first end of a racket line, and when the first end of the racket line extends a preset length, it is cut by the robotic arm.

Abstract: A hollow polymeric fiber includes: a tetragonal shape sectional area having four corner points and four edges. The four corner points form a square. All four edges are concave or straight. The fiber has a cross sectional area hollowness ranging from 12 to 25%. The fiber has a titer in a range of from 4 to 16 dtex.

Abstract: A solid polymeric fiber includes: a six- to ten-fingered sectional area having fingers having central axes. The fingers are positioned unsymmetrically to each of the central axes, and/or the sectional area of the fiber has no rotational axis. In an embodiment, the six- to ten-fingered sectional area is a six-fingered sectional area.

Abstract: A cell image segmentation method includes receiving a cell image, performing a nuclei initialization step to find an internal marker and an external marker to obtain a potential nuclei and a potential cell boundary, calculating a gradient map of the received cell image, performing a filtering step on the gradient map to generate a filtered gradient map, performing a nuclei detection step to obtain a segmented nuclei, and performing a nuclei validation step to obtain a valid nuclei. The nuclei initialization step includes performing a blob detection step to obtain a nuclei candidate, an outlier removal step to obtain the internal marker, a distance transform step to obtain a distance map, and a cell boundary initialization step to obtain the external marker. In another embodiment, a nuclear-to-cytoplasmic ratio evaluation method using the above cell image segmentation method is proposed.

Abstract: A cell image segmentation method includes receiving a cell image, performing a nuclei initialization step to find an internal marker and an external marker to obtain a potential nuclei and a potential cell boundary, calculating a gradient map of the received cell image, performing a filtering step on the gradient map to generate a filtered gradient map, performing a nuclei detection step to obtain a segmented nuclei, and performing a nuclei validation step to obtain a valid nuclei. The nuclei initialization step includes performing a blob detection step to obtain a nuclei candidate, an outlier removal step to obtain the internal marker, a distance transform step to obtain a distance map, and a cell boundary initialization step to obtain the external marker. In another embodiment, a nuclear-to-cytoplasmic ratio evaluation method using the above cell image segmentation method is proposed.