Abstract: The invention discloses a fastening member with external threads, which is capable of mating with a fastening member with internal threads via the external threads and the internal threads; each external thread includes a leading flank and a trailing flank; the external thread further includes an oblique surface extending between the leading flank of the external thread and the trailing flank of the external thread; a joint between the oblique surface of the external thread and the leading flank of the external thread is farther away from an axis the external thread, compared with a joint between the oblique surface of the external thread and the trailing flank of the external thread; the oblique surface of the external thread is attached against the oblique surface of the internal thread. The invention also provides a threaded fastening assembly.

Abstract: A landfill system having a waste pit with a base portion. The base portion is covered with a liquid impermeable sheet and there is disposed at least one filtration zone below the base portion. Waste water is prevented from entering the natural substrate and the water table before it is directed through the filtration zone wherein the waste water is treated to remove contaminants prior to entering the natural substrate. Also included is a method for constructing a landfill system wherein a waste pit is cleared of debris and a liquid impermeable sheet is disposed on the base portion. In the base portion a filtration system is installed to capture waste water prior to entry into the natural substrate.

Abstract: This invention relates to a collapsible and movable support for wardrobe comprising a collapsible main frame consisting of two parallel frames, each of which having three hollow tubes connected one after another, a bottom plate to which the lower ends of said main frame are secured being provided on the underside with a pair of wheels, a supporting means pivotally secured to said bottom plate and opposite to said wheels, and a wardrobe capable of being secured to said main frame and said bottom plate hence to provide a collapsible and movable support for wardrobe for the users.