Abstract: A case with screw thread in a sealed manner for communication equipment includes an upper cover and a bottom cover. The inner surface of the upper cover has an internal screw thread. The outer surface of the bottom cover has an external screw thread. When the external screw thread is fixed with the internal screw thread, the inner surface of the upper cover is in contact with the outer surface of the bottom cover in a sealed state, and the upper cover and the bottom cover form a receiving space. The case provides the following advantages: quickly and repeated assembly and disassembly; no need for any space for bolts so as to minimizes the size; without bolt, no need for washers or sealant; good sealing properties and good waterproof effect so as to prevent water from entering the case.

Abstract: A hoop net for deep water crab and lobster fishing includes a smaller upper double ring coupled to a larger lower double ring via lateral support beams, and covered by a net with an opening defined by the upper double ring, and further including a smaller inner double ring affixed to the bottom of the net and located centrally relative to the upper and lower double rings.

Abstract: A deep-water squid jig is provided to have a one-piece solid spine on which a main body in the shape of a squid, a number of sub-bodies or orbs and a series of multi-prong hooks are threaded. The main body and orbs are made of a luminous glow-in-the-dark plastic material. A swivel is attached to a looped top of the spine for the fishing line hook up. A number of multi-prong hooks are provided to catch the squid as it attacks the lure hooking itself on the multiple hooks. Also, a cylindrical handle is installed on the top portion of the spine above the main body to manipulate the jig and a squid caught out of the water. To the lower end of the jig is attached a lead weight which may be held there by a couple of O-rings seated on grooves formed at the lower end of the spine. The weighted deep-water squid jig may have lead molded directly into the body of the lure. So, fishermen would not have to add weights to the lure that is conventional in the art of squid fishing.

Abstract: A pocketed crab and lobster hoop net comprising a larger outer upper ring, a smaller inner lower ring, and located inside the outer upper ring when the net is laid flat on the sea floor. An intermediate net is woven of mesh between the rings. The mesh conforms to the rings and forms a net having selvage woven around rings retaining the mesh to the ring. A first central net is woven inside the inner lower ring. A second central net is woven inside the inner lower ring parallels the first central net sharing a majority of common selvage. The cord defining a chord and forms an arc shaped pocket opening in cooperation with a first central net, the pocket definition cord having two opposite ends attached to two end points near the circumference of the inner lower ring. A bait pocket is formed between the slack of the second central net and first central net, the pocket capable of holding bait pleasing to crustaceans.

Abstract: A pocketed crab and lobster hoop net comprising a larger outer upper ring, a smaller inner lower ring, and located inside the outer upper ring when the net is laid flat on the sea floor. An intermediate net is woven of mesh between the rings. The mesh conforms to the rings and forms a net having selvage woven around rings retaining the mesh to the ring. A first central net is woven inside the inner lower ring. A second central net is woven inside the inner lower ring parallels the first central net sharing a majority of common selvage. The cord defining a chord and forms an arc shaped pocket opening in cooperation with a first central net, the pocket definition cord having two opposite ends attached to two end points near the circumference of the inner lower ring. A bait pocket is formed between the slack of the second central net and first central net, the pocket capable of holding bait pleasing to crustaceans.

Abstract: A pocketed crab and lobster hoop net comprising a larger outer upper ring, a smaller inner lower ring, and located inside the outer upper ring when the net is laid flat on the sea floor. An intermediate net is woven of mesh between the rings. The mesh conforms to the rings and forms a net having selvage woven around rings retaining the mesh to the ring. A first central net is woven inside the inner lower ring. A second central net is woven inside the inner lower ring parallels the first central net sharing a majority of common selvage. The cord defining a chord and forms an arc shaped pocket opening in cooperation with a first central net, the pocket definition cord having two opposite ends attached to two end points near the circumference of the inner lower ring. A bait pocket is formed between the slack of the second central net and first central net, the pocket capable of holding bait pleasing to crustaceans.

Abstract: A distributed fiber-grating-based sensing system, the system comprises one or more scanned birefringence fiber interferometers to detect the small wavelength shift of the light reflected from the fiber grating, a wavelength demultiplexer to separate the lights from each fiber grating, a reference fiber grating for determining the absolute optical wavelengths. Compared with the prior art, the system has advantages of easier fabrication, better stabilization, and can be customized for different applications.