Abstract: A ventilation conduit is provided, the ventilation conduit being configured to be installed in a building structure with cement poured on said conduit. The ventilation conduit is configured to have a profile section comprising a plurality of layers, a first layer being of a first material and a second layer being of a second material having anti-corrosion properties. The first material may be any of galvanized steel, aluminum or stainless steel and the second material may be a polymer-based material. The layers are arranged in a configuration having periodic waves and sealing regions in a hook configuration. An anti-corrosion coating and a thermal insulation membrane may be applied on the first and second materials. A method for processing and installing a ventilation conduit is further provided, the method allowing the processing of ventilation conduits as described above.

Abstract: A method for laser keyhole welding of metal alloys is disclosed. The method independently adjusts power in a focused center beam and power in a concentric focused annular beam. At the termination of a weld, the power in the center beam is initially ramped up and then ramped down, while the power in the annular beam is ramped down. Increasing the power in the center beam enables a controlled and prolonged contraction of the keyhole and melt pool, thereby preventing undesirable cracking.

Abstract: A method for laser keyhole welding of metal alloys is disclosed. The method independently adjusts power in a focused center beam and power in a concentric focused annular beam. At the termination of a weld, the power in the center beam is initially ramped up and then ramped down, while the power in the annular beam is ramped down. Increasing the power in the center beam enables a controlled and prolonged contraction of the keyhole and melt pool, thereby preventing undesirable cracking.

Abstract: An aerodynamic bicycle frame may include one or more elongate frame members having a rounded leading edge, a blunt trailing edge, and a plurality of vortex-generating channels formed at opposite corners of the trailing edge. Successive pairs of such channels may be spaced apart by a selected distance, such as a distance corresponding to a wavelength of the expected flow instability.

Abstract: There is provided a device for motion identification, the device comprising: an enclosure and a plurality of sensors being provided with the enclosure and configured to measure acceleration in three axes and angular motion in three axes.

Abstract: A method of sustaining alertness of attendees during a meeting is provided, comprising the steps of (a) providing at least a meal from a meal plan to said attendees, each of said meals comprising at least a food and at least a fluid, said meal plan configured to enhance energy levels by selection of a quantity of each of said foods for said meal based on a nutritional value of said food; and a quantity of each of said fluids for said meal plan based on a nutritional value of said fluid; (b) providing a time schedule configured to promote attentiveness by providing break periods wherein foods and fluids from said meal plan are served to said attendees; and (c) providing an environment configured to promote concentration by manipulating atmospheric conditions of a meeting space wherein said meeting takes place.