Abstract: Semiconductor structures and methods are provided. A semiconductor structure according to the present disclosure includes a first active region extending lengthwise along a first direction and having a first width along a second direction perpendicular to the first direction, a second active region extending lengthwise along the first direction and having a second width along the second direction, and an epitaxial feature sandwiched between the first active region and the second active region along the first direction. The first width is greater than the second width.

Abstract: An open type breathing-out particles capture and filtration device includes a mask having an air-in space defined between an upper edge of the mask and a user's face; a suction assembly including an air expelling pipe communicable with the air-in space and a fan; filtering materials located upstream of the fan; and a power supply driving the fan to rotate and produce a suction airflow. External air flowed into the mask via the air-in space and air breathed out of the user's nose and mouth is sucked by the suction airflow to pass through the filtering materials, so that air discharged from the air expelling pipe is clean air without any infection source. With the air-in space, an additional load applied to the mask by the suction airflow is reduced and contact areas between the mask and the user's face is also reduced, making the mask more comfortable for wearing.

Abstract: A nebulizer with orientation independent operation is provided. The nebulizer includes an outer tube, an inner tube provided in the outer tube, and a mesh structure disposed above an end of the outer tube. A first channel, a main channel, and a second channel are formed between the outer tube and the inner tube. When in use, capillary force is created in the main channel, such that a liquid contained in the inner tube can be transported sequentially through the second channel, the main channel, and the first channel to the mesh structure. The liquid is nebulized and dispersed into the air through vibrations of the mesh structure actuated by an annular vibration source.

Abstract: A nebulizer with orientation independent operation is provided. The nebulizer includes an outer tube, an inner tube provided in the outer tube, and a mesh structure disposed above an end of the outer tube. A first channel, a main channel, and a second channel are formed between the outer tube and the inner tube. When in use, capillary force is created in the main channel, such that a liquid contained in the inner tube can be transported sequentially through the second channel, the main channel, and the first channel to the mesh structure. The liquid is nebulized and dispersed into the air through vibrations of the mesh structure actuated by an annular vibration source.

Abstract: A size-selective sampler includes: a base body having a receiving space and a concave surface curved toward the receiving space, wherein the concave surface has opposite first and second sides; an inlet port formed on the first side of the concave surface and communicating with the receiving space; and an outlet port formed on the second side of the concave surface and communicating with the receiving space. The inlet port has a length of at least 20 mm along the first side of the concave surface so as to reduce penetration of particles in an air flow. Further, the particle penetration curve is roughly equal to the ISO curve.