초록 ▼

A method and system are disclosed for fumigating at least one region with a nonflammable gaseous mixture including phosphine. A sensor senses the concentration of phosphine for atmosphere of the region and a flow controller controls flow to the region in response to the sensed concentration. A recyc

A method and system are disclosed for fumigating at least one region with a nonflammable gaseous mixture including phosphine. A sensor senses the concentration of phosphine for atmosphere of the region and a flow controller controls flow to the region in response to the sensed concentration. A recycling passage removes a portion of the atmosphere from the region and returns the atmosphere to create a recycle flow through the region. In addition, a gas mixing system is provided to supply the non-flammable mixture by mixing phosphine from a phosphine source and an inert substance from an inert substance source.

대표청구항 ▼

A method and system are disclosed for fumigating at least one region with a nonflammable gaseous mixture including phosphine. A sensor senses the concentration of phosphine for atmosphere of the region and a flow controller controls flow to the region in response to the sensed concentration. A recyc

A method and system are disclosed for fumigating at least one region with a nonflammable gaseous mixture including phosphine. A sensor senses the concentration of phosphine for atmosphere of the region and a flow controller controls flow to the region in response to the sensed concentration. A recycling passage removes a portion of the atmosphere from the region and returns the atmosphere to create a recycle flow through the region. In addition, a gas mixing system is provided to supply the non-flammable mixture by mixing phosphine from a phosphine source and an inert substance from an inert substance source. upport having a coupling portion at one end thereof detachably coupled to one of the first and second mounting holes, thereby enabling said back support to be extended from the corresponding mounting hole toward one peripheral side of said frame base which defines with the other end of said back support a triangle that supports the picture frame on a flat surface; and wherein each of said first and second mounting holes is comprised of an inside chamber inside said frame base and an opening in said back side of said frame base in communication with said inside chamber, said opening having an insertion portion and an elongate extension portion extending from said insertion portion toward the border of said frame base, said extension portion having a width smaller than the diameter of said insertion portion; said coupling portion of said back support having two parallel clamping strips extending from one end thereof and a stop portion disposed at an opposite end thereof, said clamping strips being respectively clamped on the inside and outside of the mounting hole of said frame base in which said coupling portion is connected and the stop portion of said coupling portion is stopped outside the opening of the corresponding mounting hole after installation of said coupling portion in the corresponding mounting hole. 2. The multi display mode picture frame as claimed in claim 1, wherein said frame base comprises two first mounting holes respectively bilaterally spaced between the center of said back side of said frame base and the mid points of said short peripheral sides of said frame base, and two second mounting holes respectively bilaterally spaced between the center of said back side of said frame base and the mid points of said long peripheral sides of said frame base. 3. The multi display mode picture frame as claimed in claim 1, wherein said back support comprises a supporting base, said supporting base having two straight end edges, the contained angle defined between extension lines of said straight end edges being an acute angle, one of said straight end edges forming a positioning portion, the other of said straight end edges being fixedly connected to said coupling portion, said parallel clamping strips being forwardly extended from one end toward said contained angle in a perpendicular relationship with said supporting base; said coupling portion of said back support having a chamfered angle disposed at an outer side adjacent to said stop portion. 4. The multi display mode picture frame as claimed in claim 1, wherein said back support is a flat member detachably coupled and closely attached to the back side of said frame base. 5. The multi display mode picture frame as claimed in claim 4, further comprising a recessed mounting portion and a peg respectively provided in said back support and the back side of said frame base and adapted for enabling said back support to be detachably fastened and closely attached to the back side of said frame base by engaging said peg into said recessed mounting portion. 6. The multi display mode picture frame as claimed in claim 5, wherein said frame base further comprises a flange protruded from the back side and extended along the border thereof, a long rib protruded from the back side in parallel to said long peripheral sides, a short rib protruded from the back side in parallel to said short peripheral sides and intersected with said long rib at the center of the back side of said frame base, at least one first protruded block respectively formed integral with said long rib and defining said at least one first mounting hole, and at least one second protruded block respectively formed integral with said short rib and defining said at least one second mounting hole; said peg is formed in one of the long and short ribs adjacent to the center of the back side of said frame base; said back support comprises a supporting base, said supporting base having one end connected to said cou