A shaped article can include a substrate formed from a glass material, a glass ceramic material, or a combination thereof and a cavity formed in the substrate. A sidewall of the cavity can have a random textured surface with a surface roughness of less than or equal to 300 nm. A method of machining a protrusion in a graphite block can include translating a cutting tool in a first longitudinal direction toward the graphite block to engage the graphite block with the cutting tool while rotating the cutting tool about a rotational axis without translating the cutting tool in a lateral direction, then translating the cutting tool in a second longitudinal direction away from the graphite block without translating the cutting tool in the lateral direction to disengage the cutting tool from the graphite block. A shaped article can be formed by pressing a preform with a monolithic graphite mold.

A shaped article can include a substrate formed from a glass material, a glass ceramic material, or a combination thereof and a cavity formed in the substrate. A sidewall of the cavity can have a random textured surface with a surface roughness of less than or equal to 300 nm. A method of machining a protrusion in a graphite block can include translating a cutting tool in a first longitudinal direction toward the graphite block to engage the graphite block with the cutting tool while rotating the cutting tool about a rotational axis without translating the cutting tool in a lateral direction, then translating the cutting tool in a second longitudinal direction away from the graphite block without translating the cutting tool in the lateral direction to disengage the cutting tool from the graphite block. A shaped article can be formed by pressing a preform with a monolithic graphite mold.

In a structure for cooling a component member of a gas turbine using a working gas, a plurality of heat transfer enhancement ribs having W shapes are provided so as to project from the wall surface of a passage wall facing a cooling medium passage through which a cooling medium flows. In each heat transfer enhancement rib, outside corner portions facing toward the upstream side are formed in an angled shape, and at least any one of inside corner portions and outside corner portions other than the outside corner portion facing toward the upstream side are formed in a curved shape.

In a structure for cooling a component member of a gas turbine using a working gas, a plurality of heat transfer enhancement ribs having W shapes are provided so as to project from the wall surface of a passage wall facing a cooling medium passage through which a cooling medium flows. In each heat transfer enhancement rib, outside corner portions facing toward the upstream side are formed in an angled shape, and at least any one of inside corner portions and outside corner portions other than the outside corner portion facing toward the upstream side are formed in a curved shape.

Provided herein are muzzle brakes, firearms, and methods for manufacturing the same. A muzzle brake for attachment to a muzzle end of a firearm includes a body defining a first end that engages a muzzle end of the firearm, a second end opposite the first end, and an axis extending therebetween. The body further defines one or more openings intersecting the axis to form a channel extending between the first end and the second end along the axis. The body further defines a first port extending from the channel to an exterior surface of the body and a second port extending from the channel to the exterior surface of the body between the first port and the second end. In operation, the first port directs gas from the channel to an external environment of the muzzle brake that disrupts gas directed by the second port from the channel.

Various embodiments relate to a case included in an electronic device, and according to one embodiment, an electronic device case comprises: an exterior case formed by processing an upper surface of a base material of the electronic device case by means of a first head of a CNC device, and at least one pattern formed by processing a lateral surface of the exterior case by means of second and third heads of the CNC device, wherein at least one pattern includes first and second patterns, the first pattern is processed at the lateral surface of the exterior case by means of the second head, and the second pattern can be processed at the first pattern by means of the third head. In addition, other various embodiments are possible.

In some embodiments, the present disclosure relates to a method that includes bonding a first wafer to a second wafer to form a wafer stack and removing a top portion of the second wafer. A first trim blade having a first blade width is aligned over the second wafer. The first trim blade is used to form a trench that separates a central portion of the second wafer from a peripheral portion of the second wafer. The trench is arranged at a first distance from an outer perimeter of the second wafer, and extends from a top surface of the second wafer to a trench depth beneath the top surface of the first wafer. A second trim blade having a second blade width is aligned over the peripheral portion, the second blade width being greater than the first blade width. The peripheral portion is removed using the second trim blade.

In some embodiments, the present disclosure relates to a method that includes bonding a first wafer to a second wafer to form a wafer stack and removing a top portion of the second wafer. A first trim blade having a first blade width is aligned over the second wafer. The first trim blade is used to form a trench that separates a central portion of the second wafer from a peripheral portion of the second wafer. The trench is arranged at a first distance from an outer perimeter of the second wafer, and extends from a top surface of the second wafer to a trench depth beneath the top surface of the first wafer. A second trim blade having a second blade width is aligned over the peripheral portion, the second blade width being greater than the first blade width. The peripheral portion is removed using the second trim blade.

Machining ball tracks and guiding webs of an inner part for a constant velocity joint in a clamping arrangement includes mechanical machining of at least one first ball track in a first rotational position; rotating the articulated inner part into a second rotational position for machining at least one further ball track; wherein at least one guiding web is mechanically machined during the rotating of the inner joint part from the first rotational position into the second rotational position. A corresponding device is used for machining ball tracks and guiding webs of an inner joint part.

Machining ball tracks and guiding webs of an inner part for a constant velocity joint in a clamping arrangement includes mechanical machining of at least one first ball track in a first rotational position; rotating the articulated inner part into a second rotational position for machining at least one further ball track; wherein at least one guiding web is mechanically machined during the rotating of the inner joint part from the first rotational position into the second rotational position. A corresponding device is used for machining ball tracks and guiding webs of an inner joint part.