Abstract: The present invention describes a safe-and-arm device, mechanism or assembly (160) for a projectile (100,102) equipped with a second-stage propellant (124). The second-stage propellant (124) is ignited after the projectile has been ejected out from a launcher barrel. A lockpin (190), being urged by a spring (194), is responsive to ignition of the second-stage propellant; after the lockpin (190) and spring (194) sense and respond to the second propulsion, an unbalanced rotor (164) forming part of the safe-and-arm device or assembly (160), is released to rotate from a “safe” state to an “armed” state, as the projectile continues traveling along its trajectory to a target. In one embodiment, the projectile is configured with a 40 mm cartridge containing a first propellant (122). An impact sensor may trigger an electric detonator or a point detonator may trigger a stab detonator to set off explosives disposed in the projectile.

Abstract: Authenticating the location of a viewing device for receiving content includes storing a plurality of connection identifiers in a database, the connection identifiers being associated with a plurality of networking devices and a plurality of user accounts. A viewing device sends a request to access content which is received by a server. The request is associated with a user account. One or more first connection identifiers is selected from the database based on the user account to which the request is associated. A second connection identifier is obtained based on a connection between the viewing device and the server. It is determined if the second connection identifier matches one of the one or more first connection identifiers. Content is provided to the viewing device if the second connection identifier matches one of the one or more of the first connection identifiers.

Abstract: Authenticating the location of a viewing device for receiving content includes storing a plurality of connection identifiers in a database, the connection identifiers being associated with a plurality of networking devices and a plurality of user accounts. A viewing device sends a request to access content which is received by a server. The request is associated with a user account. One or more first connection identifiers is selected from the database based on the user account to which the request is associated. A second connection identifier is obtained based on a connection between the viewing device and the server. It is determined if the second connection identifier matches one of the one or more first connection identifiers. Content is provided to the viewing device if the second connection identifier matches one of the one or more of the first connection identifiers.

Abstract: The present invention describes an air-burst projectile (100) and a system (200) for deploying the airburst projectile to counter an unmanned aerial vehicle (UAV) 10. Each airburst projectile includes one or more spinners (140, 140a-140d); each spinner has a sleeve or a tube (146), a number of radial partition plates (148, 148a-148d) extending from the sleeve/tube and an annular rear plate (144) connected to the sleeve. Adjacent partition plates thus form a compartment (150). Disposed in each compartment is a streamer or streamers (170,170a,170b), which are formed in a coiled-up state. When the airburst projectile is deployed into a flight path of a target UAV, the spinners (140, 140a-140d) are ejected and the streamers (170,170a,170b) are dispersed in the flight path to create a streamer cloud, so that a streamer may entangle with propellers of the UAV and bring down the UAV, or as a warning or fence marking shot.

Abstract: The present invention describes an air-burst projectile (100) and a system (200) for deploying the airburst projectile to counter an unmanned aerial vehicle (UAV) 10. Each airburst projectile includes one or more spinners (140, 140a-140d); each spinner has a sleeve or a tube (146), a number of radial partition plates (148, 148a-148d) extending from the sleeve/tube and an annular rear plate (144) connected to the sleeve. Adjacent partition plates thus form a compartment (150). Disposed in each compartment is a streamer or streamers (170,170a,170b), which are formed in a coiled-up state. When the airburst projectile is deployed into a flight path of a target UAV, the spinners (140, 140a-140d) are ejected and the streamers (170,170a,170b) are dispersed in the flight path to create a streamer cloud, so that a streamer may entangle with propellers of the UAV and bring down the UAV, or as a warning or fence marking shot.

Abstract: Among other things, we describe a self-cleaning sensor housing. The self-cleaning sensor housing includes at least one sensor comprising a sensor aperture, a motor rotatable about a first axis of revolution, a substantially transparent screen rotatable about a second fixed axis of revolution, and a cleaning mechanism located proximate to the screen and configured to contact the substantially transparent screen. The screen is mechanically coupled to the motor and covers at least a portion of the sensor aperture. We also describe methods for performing self-cleaning operations.

Abstract: A head-mounted display device includes a display unit projecting an image beam to user's eyes, thus enabling the user to see an enlarged virtual image, a headphone unit configured to transmit sound information to user's ears, and a connecting unit. The connecting unit is substantially C-shaped and defines a C-shaped opening. A middle portion of the connecting unit couples to the display unit. Two opposite sides of the C-shaped opening of the connecting unit couples to the headphone unit. The connecting unit includes an outer frame, a connecting assembly, and an inner frame. The connecting assembly includes at least two independent connecting members. The connecting assembly couples to the outer frame. The inner frame couples to the connecting assembly, and portions near the two opposite sides fix to the outer frame, thus sandwiching the connecting assembly between the inner frame and the outer frame.

Abstract: Apparatus and method for a physical simulation experiment of fracturing an unconventional oil and gas reservoir layer by layer by spiral perforation via a horizontal well bore. The apparatus includes an outer wellbore provided with at least three layers of spiral perforations, and an inner wellbore provided with at least three layers of through-holes. The method includes injecting fracturing fluid into the inner wellbore, and opening a first layer cracks of a stratum by the fracturing fluid passing the first through-hole layer and the first spiral perforation layer, opening a second layer cracks of the stratum by the fracturing fluid passing second through-hole layer and second spiral perforation layer and opening a third layer cracks of the stratum by the fracturing fluid passing third through-hole layer and third spiral perforation layer.

Abstract: A piping system is provided, connecting a plurality of scrubbers which are disposed on a supporting structure, including a collecting pipe and a drain pipe. The collecting pipe has a main body and a plurality of protrusions, wherein the main body has an outer surface and a first central axis. The protrusions are protruding from the outer surface, and the first central axis is perpendicular to the supporting structure. The collecting pipe communicates with the scrubbers via the protrusions. The drain pipe is disposed under the supporting structure and has a second central axis, wherein the collecting pipe is extended through the supporting structure and connects to the drain pipe, and the first central axis is perpendicular to the second central axis.

Abstract: A head-mounted display device includes a display unit projecting an image beam to user's eyes, thus enabling the user to see an enlarged virtual image, a headphone unit configured to transmit sound information to user's ears, and a connecting unit. The connecting unit is substantially C-shaped and defines a C-shaped opening. A middle portion of the connecting unit couples to the display unit. Two opposite sides of the C-shaped opening of the connecting unit couples to the headphone unit. The connecting unit includes an outer frame, a connecting assembly, and an inner frame. The connecting assembly includes at least two independent connecting members. The connecting assembly couples to the outer frame. The inner frame couples to the connecting assembly, and portions near the two opposite sides fix to the outer frame, thus sandwiching the connecting assembly between the inner frame and the outer frame.

Abstract: Apparatus and method for a physical simulation experiment of fracturing an unconventional oil and gas reservoir layer by layer by spiral perforation via a horizontal well bore. The apparatus includes an outer wellbore provided with at least three layers of spiral perforations, and an inner wellbore provided with at least three layers of through-holes. The method includes injecting fracturing fluid into the inner wellbore, and opening a first layer cracks of a stratum by the fracturing fluid passing the first through-hole layer and the first spiral perforation layer, opening a second layer cracks of the stratum by the fracturing fluid passing second through-hole layer and second spiral perforation layer and opening a third layer cracks of the stratum by the fracturing fluid passing third through-hole layer and third spiral perforation layer.

Abstract: A piping system is provided, connecting a plurality of scrubbers which are disposed on a supporting structure, including a collecting pipe and a drain pipe. The collecting pipe has a main body and a plurality of protrusions, wherein the main body has an outer surface and a first central axis. The protrusions are protruding from the outer surface, and the first central axis is perpendicular to the supporting structure. The collecting pipe communicates with the scrubbers via the protrusions. The drain pipe is disposed under the supporting structure and has a second central axis, wherein the collecting pipe is extended through the supporting structure and connects to the drain pipe, and the first central axis is perpendicular to the second central axis.

Abstract: A point of sale system including a display subsystem including a viewable display array having multiple controllable display locations being operative to display non-trusted display content and trusted display content and a trusted/non-trusted display content controller operative to govern operation of the display subsystem and thereby to selectably allow a portion of the non-trusted display content from a non-trusted display content source to be viewed, at at least one display location on the viewable display array, which at least one display location is selected by the trusted/non-trusted content controller, without the trusted/non-trusted content controller needing to have knowledge of the non-trusted display content, to be incapable of enabling malicious content, forming part of the non-trusted display content, to be readably displayed, which could lead to unauthorized entry of confidential information by a user.

Abstract: According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.

Abstract: A point of sale system including a display subsystem including a viewable display array having multiple controllable display locations being operative to display non-trusted display content and trusted display content and a trusted/non-trusted display content controller operative to govern operation of the display subsystem and thereby to selectably allow a portion of the non-trusted display content from a non-trusted display content source to be viewed, at at least one display location on the viewable display array, which at least one display location is selected by the trusted/non-trusted content controller, without the trusted/non-trusted content controller needing to have knowledge of the non-trusted display content, to be incapable of enabling malicious content, forming part of the non-trusted display content, to be readably displayed, which could lead to unauthorized entry of confidential information by a user.

Abstract: According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.

Abstract: A molding device includes a male die, a master die core, a male die core located between the male die and the master die core, and a cutting mechanism received in the male die core. The cutting mechanism includes a cutting seat and a cutter. The cutting seat defines a latch slot. The latch slot includes a narrow portion and a wide portion communicating with the narrow portion. The cutter includes a plate body received in the narrow portion and a latch shaft located on the plate body. The latch shaft is engaged in the wide portion. When a plastic product is formed and a sprue gate is around the mold cavity, the plate body is configured to cut the sprue gate, and the plate body is movable relative to the cutting seat around the latch shaft, to prevent the plate body from sticking.

Abstract: A cutting apparatus configured for aligned with a gate of an injection molding part, includes a bottom board, a main adjustable mechanism attached to the bottom board, and a cutting mechanism. The main adjustable mechanism includes a driving device, a mounting member attached to the driving device, and a rotatable member rotatably attached to the mounting member. The rotatable member can be rotatable relative to the mounting member between a first position, where an acute angle is formed between the rotatable member and the mounting member, and a second position, where the rotatable member parallel to and abuts the mounting member.

Abstract: A molding device includes a male die, a master die core, a male die core located between the male die and the master die core, and a cutting mechanism received in the male die core. The cutting mechanism includes a cutting seat and a cutter. The cutting seat defines a latch slot. The latch slot includes a narrow portion and a wide portion communicating with the narrow portion. The cutter includes a plate body received in the narrow portion and a latch shaft located on the plate body. The latch shaft is engaged in the wide portion. When a plastic product is formed and a sprue gate is around the mold cavity, the plate body is configured to cut the sprue gate, and the plate body is movable relative to the cutting seat around the latch shaft, to prevent the plate body from sticking.

Abstract: A discrete cosine transform (DCT)-based orthogonal frequency-division multiplexing (OFDM) system is provided with a zero-padding guard interval and MMSE reception. The performance of the DCT-OFDM system with the zero-padding guard interval scheme and the minimum mean-square error (MMSE) receiver over time-varying multipath Rayleigh fading channels is investigated. The results show that employing the proposed DCT-OFDM system rather than the conventional DFT-OFDM system can provide better bit error rate performance in practical systems, by as much as 6 dB in signal-to-noise ratio.