A method, a device, and a system using the device, for avalanche control using an unmanned aerial vehicle to transport an explosive charge to a snow surface or snowpack. A holder of the device holds the explosive charge in a container. A receiver of the device receives a release signal. The holder releases the explosive charge in response to the release signal. A coupler couples the holder to the unmanned aerial vehicle. The explosive charge is fuzed to detonate after release from the holder to trigger an avalanche.

An energy conversion system may comprise a substrate including a first conductive trace and a second conductive trace electrically isolated from the first conductive trace. A housing may be coupled to the substrate. An ignition compound may be located in the housing. A solder may be thermally coupled to the ignition compound such that ignition of the ignition compound melts the solder. The housing may be configured to output the solder onto the first conductive trace and the second conductive trace.

A downline wire for connecting a location on surface to at least one detonator in a blast hole, the downline wire including at least two flexible electrical conductors, a respective flexible layer of an insulating material which encases each conductor, and a flexible sheath in which the insulated conductors are embedded, wherein each conductor comprises a steel core which is clad with copper, the insulating material is selected from a filled flexible polyvinylchloride (PVC) composition and a polyester elastomer, and the sheath is made from a medium or high density polyethylene compound which includes carbon black.

A downline wire for connecting a location on surface to at least one detonator in a blast hole, the downline wire including at least two flexible electrical conductors, a respective flexible layer of an insulating material which encases each conductor, and a flexible sheath in which the insulated conductors are embedded, wherein each conductor comprises a steel core which is clad with copper, the insulating material is selected from a filled flexible polyvinylchloride (PVC) composition and a polyester elastomer, and the sheath is made from a medium or high density polyethylene compound which includes carbon black.

Examples relate to a linear shaped charge support structure configured to support a linear shaped charge in a canted configuration with at least part of the linear shaped charge canted about a longitudinal axis of the linear shaped charge. Examples relates to a linear shaped charge, the linear shaped charge support structure comprising a linear shaped charge, and a support frame comprising the linear shaped charge support structure and a non-linear shaped charge support structure.

Examples relate to a linear shaped charge support structure configured to support a linear shaped charge in a canted configuration with at least part of the linear shaped charge canted about a longitudinal axis of the linear shaped charge. Examples relates to a linear shaped charge, the linear shaped charge support structure comprising a linear shaped charge, and a support frame comprising the linear shaped charge support structure and a non-linear shaped charge support structure.

Apparatus includes a conveyance device and a first shearable deployment bar connected to the conveyance device at a first distal end of the first shearable deployment bar, where the first shearable deployment bar has a deployment bar section and a shearable section. The shearable deployment bar is configured to carry a ballistic signal from an initiating charge, through the shearable deployment bar, and to a donor charge. The apparatus further includes a first set of perforating guns connected to the first shearable deployment bar at a second distal end thereof, and the first set of perforating guns are configured to receive the ballistic signal from the donor charge to ultimately fire the perforating guns at a targeted location in a wellbore. A second shearable deployment bar may be connected to the first set of perforating guns, and a second set of perforating guns connected to the second shearable deployment bar.

Apparatus includes a conveyance device and a first shearable deployment bar connected to the conveyance device at a first distal end of the first shearable deployment bar, where the first shearable deployment bar has a deployment bar section and a shearable section. The shearable deployment bar is configured to carry a ballistic signal from an initiating charge, through the shearable deployment bar, and to a donor charge. The apparatus further includes a first set of perforating guns connected to the first shearable deployment bar at a second distal end thereof, and the first set of perforating guns are configured to receive the ballistic signal from the donor charge to ultimately fire the perforating guns at a targeted location in a wellbore. A second shearable deployment bar may be connected to the first set of perforating guns, and a second set of perforating guns connected to the second shearable deployment bar.

A breaching device includes a body having a tamping material. The body has a target surface that is configured to face a target to be breached and a backing surface that is opposite the target surface. The tamping material is formed of gel and is configured to reflect an explosive force directed way from the target surface towards the target surface.

An avalanche control device includes a detonation initiator unit and a bio-degradable linear bag. The initiator unit is elongated and includes an ignition end, an inflation end, and a stepped transition zone in between that gets progressively greater in diameter as it extends from the ignition end towards the inflation end. The inflatable bag is adapted for connection to the inflation end of the initiator unit. The design of initiator unit is fixed and reusable, while the bag dimensions can be tailored to the desired blast strength for the end user, in terms of length, diameter, and mixture ratio.