A smart mechanical component has a mechanical part main body; a mechanical part secondary body located inside of the mechanical part main body; a three dimensional three-dimensional (3-D) reserved space located between the mechanical part main body and the mechanical part secondary body; at least one connecting unit connecting the mechanical part main body and the mechanical part secondary body; wherein the mechanical part main body, the mechanical part secondary body and the three dimensional three-dimensional (3-D) reserved space form a capacitor; the connecting unit forms an inductor; the inductor and the capacitor forms an inductor-capacitor circuit.

A double-sided break-away bolt including a precision weakened area enabling the bolt to break into two or more sections upon predefined conditions is provided. The break-away bolt is adapted to connect a fire hydrant to a check valve with the weakened portion generally positioned at the junction between the hydrant and the valve. A force applied to the fire hydrant in a direction generally perpendicular to the break-away bolt (e.g., by a car colliding with the hydrant) may cause the break-away bolt to break at the weakened area. This in return facilitates the separation of the hydrant from the check valve allowing the check valve to close. The break-away bolt also includes a gripping element that becomes exposed upon the breaking of the bolt to facilitate the removal of the bolt from the check valve for replacement.

A double-sided break-away bolt including a precision weakened area enabling the bolt to break into two or more sections upon predefined conditions is provided. The break-away bolt is adapted to connect a fire hydrant to a check valve with the weakened portion generally positioned at the junction between the hydrant and the valve. A force applied to the fire hydrant in a direction generally perpendicular to the break-away bolt (e.g., by a car colliding with the hydrant) may cause the break-away bolt to break at the weakened area. This in return facilitates the separation of the hydrant from the check valve allowing the check valve to close. The break-away bolt also includes a gripping element that becomes exposed upon the breaking of the bolt to facilitate the removal of the bolt from the check valve for replacement.

A housing of an air-conditioning compressor comprising at least two housing components is proposed, wherein the at least two housing components are sealed with respect to each other and are connected to each other by means of screws, and the housing components comprise aluminum or an aluminum alloy and the screws are ultra-high-strength screws. UHS screws are means for further ensuring an excess pressure safety function.

A housing of an air-conditioning compressor comprising at least two housing components is proposed, wherein the at least two housing components are sealed with respect to each other and are connected to each other by means of screws, and the housing components comprise aluminum or an aluminum alloy and the screws are ultra-high-strength screws. UHS screws are means for further ensuring an excess pressure safety function.

A series tailored athermally stabilized optical (STASO) telescope system (STASOS) and method (STASOM) is disclosed. The disclosed system/method separates an optical mirror source (OMS) and an optical focal target (OFT) via a first metering rod (FMR), second metering rod (SMR), and third metering rod (TMR) where the FMR, SMR, and TMR each comprise a first retaining rod (FRR) comprised of a material having a first thermal expansion (FTE) coefficient and a second retaining rod (SRR) comprised of a material having a second thermal expansion (STE) coefficient. The FMR, SMR, and TMR are constructed so as to be athermally stabilized to ensure that the OMS and OFT remain separated at a constant or controlled distance over a predetermined temperature range by selection of appropriate FTE and STE coefficients.

A series tailored athermally stabilized optical (STASO) telescope system (STASOS) and method (STASOM) is disclosed. The disclosed system/method separates an optical mirror source (OMS) and an optical focal target (OFT) via a first metering rod (FMR), second metering rod (SMR), and third metering rod (TMR) where the FMR, SMR, and TMR each comprise a first retaining rod (FRR) comprised of a material having a first thermal expansion (FTE) coefficient and a second retaining rod (SRR) comprised of a material having a second thermal expansion (STE) coefficient. The FMR, SMR, and TMR are constructed so as to be athermally stabilized to ensure that the OMS and OFT remain separated at a constant or controlled distance over a predetermined temperature range by selection of appropriate FTE and STE coefficients.

A series tailored athermally stabilized optical (STASO) telescope system (STASOS) and method (STASOM) is disclosed. The disclosed system/method separates an optical mirror source (OMS) and an optical focal target (OFT) via a series connection of a first metering tube (FMT) and a second metering tube (SMT) that have been selected to have complementary thermal expansion characteristics so as to keep the OMS and OFT at a predetermined optical focal distance (OFD) from one another. This OFD may constitute a static distance and/or may incorporate a positive and/or negative expansion with temperature that complements thermal characteristics of the OMS and/or OFT so as to stabilize the OFD between the OMS and OFT over a predetermined range of temperatures.

A series tailored athermally stabilized optical (STASO) telescope system (STASOS) and method (STASOM) is disclosed. The disclosed system/method separates an optical mirror source (OMS) and an optical focal target (OFT) via a series connection of a first metering tube (FMT) and a second metering tube (SMT) that have been selected to have complementary thermal expansion characteristics so as to keep the OMS and OFT at a predetermined optical focal distance (OFD) from one another. This OFD may constitute a static distance and/or may incorporate a positive and/or negative expansion with temperature that complements thermal characteristics of the OMS and/or OFT so as to stabilize the OFD between the OMS and OFT over a predetermined range of temperatures.

A barrel nut with features for reducing tensile stresses under heavy load within the barrel nut has a partial-cylindrical body having a first planar end surface and a second planar end surface. A threaded bore extends through the partial-cylindrical body with a central axis substantially parallel to the first planar end surface and the second planar end surface. At least one groove is formed in each of the first planar end surface and the second planar end surface, the groove having a rounded surface extending at least a part of a distance between a curved upper surface of the partial-cylindrical body to a bottom surface thereof in a direction substantially parallel to the central axis of the threaded bore.