Abstract: A sensor having a converging shape (e.g., ellipsoidal) that causes a flow stream velocity to increase from the entry towards the center (narrowest region), in line to Bernoulli's principle. The sensor includes a trapped volume that can be used to detect gas molecules. The positioning of the sensor in a narrow region can expose it to higher velocity and higher ppm, which in turn lead to a better exchange of molecules between ambient and the void in front of a gas sensing element within the sensor, thereby improving the sensor's ability to detect gas molecules at lower concentrations and with a higher speed of response. The shape of the emission detection device allows for flow convergence regardless of the wind direction in 360°.

Abstract: A toilet bowl of a toilet, the toilet bowl comprising: a toilet base bowl comprising an upper portion and a toilet rim disposed in the upper portion of the toilet base bowl. The toilet rim comprises a tubular structure comprising a first end configured to receive water, a second end, and a middle section disposed between the first end and the second end. The water is configured to flow in a water flow direction towards the second end, and the second end is closed. The toilet rim also comprises a plurality of outlet conduits extending from the middle section directed towards an interior of the toilet base bowl. The plurality of outlet conduits is directed at an acute angle relative to the water flow direction, such that plurality of outlet conduits allow the water to enter the interior of the toilet base bowl in a swirl-flow manner.