Abstract: Provided is a light backdoor attack method for a physical world. The method includes: generating, by a flashlight, a light trigger on a traffic sign; capturing and acquiring, by a camera, a backdoor training set, and marking all images in the backdoor training set as a target label; constructing a training set according to the backdoor training set and a clean training set; training a backdoor model using the training set to obtain a trained backdoor model; and evaluating effectiveness of light backdoor attack by applying the trained backdoor model to a testing set. The method can poison DNNs to achieve a more covert backdoor attack and provide a new idea for physical backdoor attack field.

Abstract: Disclosed is an active control Stewart vibration damping platform, including a load-bearing platform, a base, and six telescopic rods. Each telescopic rod includes a driving motor, a rotating shaft, a sleeve, and a moving rod. One end, away from the driving motor, of the rotating shaft is provided with a cylindrical cavity, one end of the moving rod penetrates through the cylindrical cavity, and the sleeve is sleeved outside the rotating shaft. The rotating shaft is in running fit with the sleeve through a first bearing, and the moving rod is in sliding fit with the sleeve through a second bearing. The moving rod and the rotating shaft are respectively provided with a spiral permanent magnet. The spiral permanent magnet on the rotating shaft can drive the moving rod to move in an axial direction of the rotating shaft through the spiral permanent magnet on the moving rod when rotating.

Abstract: Disclosed is a method for preparing high-strength coral aggregate concrete under low pressure conditions, including the following steps: weighing cement, mineral admixture, coral aggregate, mixing water, water reducer, and defoamer; mixing the cement and the mineral admixture well to obtain a cementing material; putting the coral aggregate, sea water, water reducer, defoamer, and 55-85% of the cementing material into a closed mixing system to stir for 10-15 min under low pressure conditions, and pouring the remaining cementing material into the mixing system to stir for additional 10-15 min to prepare the high-strength coral aggregate concrete. The high-strength coral aggregate concrete obtained has advantages of high mechanical properties, high compactness, excellent impermeability and durability, drawing on local resources in construction engineering on remote islands and reefs, and maximum resource utilization.

Abstract: Disclosed is an active control Stewart vibration damping platform, including a load-bearing platform, a base, and six telescopic rods. Each telescopic rod includes a driving motor, a rotating shall, a sleeve, and a moving rod. One end, away from the driving motor, of the rotating shaft is provided with a cylindrical cavity, one end of the moving rod penetrates through the cylindrical cavity, and the sleeve is sleeved outside the rotating shall. The rotating shaft is in running lit with the sleeve through a first bearing, and the moving rod is in sliding fit with the sleeve through a second bearing. The moving rod and the rotating shaft are respectively provided with a spiral permanent magnet. The spiral permanent magnet on the rotating shaft can drive the moving rod to move in an axial direction of the rotating shaft through the spiral permanent magnet on the moving rod when rotating.

Abstract: A method of preparing high strength coral concrete, wherein the high strength coral concrete is prepared from raw materials of the following parts by mass: 25˜63 parts of cementing materials, 45˜58 parts of coral aggregate, 10˜16 parts of mixing water and water reducer 2˜5% the weight of the cementing materials; the weighed coral aggregate, mixing water, water reducer and 55˜85% of the cementing materials are stirred in an agitator for 10˜15 minutes; the rest of cementing materials are added in batches before initial setting and stirred; then poured and removed from the mould after 24 hours, cured in mixing water at normal temperature for 28 days, to get the high strength coral concrete.

Abstract: Disclosed are various embodiments for an anomaly detection system for detecting and identifying anomalies in electrical devices based on an energy profile associated with the electrical devices. Energy profile data associated with electrical devices or components in a power network can be obtained using an energy meter. The energy profile data can be analyzed to determine one or more conditions of the electrical devices. An anomaly of the electrical devices can be determined based on the energy profile data and conditions. Further, a root cause of the anomaly can be determined.

Abstract: Disclosed is a method for preparing high-strength coral aggregate concrete under low pressure conditions, including the following steps: weighing cement, mineral admixture, coral aggregate, mixing water, water reducer, and defoamer; mixing the cement and the mineral admixture well to obtain a cementing material; putting the coral aggregate, sea water, water reducer, defoamer, and 55-85% of the cementing material into a closed mixing system to stir for 10-15 min under low pressure conditions, and pouring the remaining cementing material into the mixing system to stir for additional 10-15 min to prepare the high-strength coral aggregate concrete. The high-strength coral aggregate concrete obtained has advantages of high mechanical properties, high compactness, excellent impermeability and durability, drawing on local resources in construction engineering on remote islands and reefs, and maximum resource utilization.

Abstract: A semiconductor structure and a method for forming same, the forming method including: providing a base, where a dummy gate structure is formed on the base, an interlayer dielectric layer is formed on the base the dummy gate structure exposes, and the interlayer dielectric layer exposes the top of the dummy gate structure; forming an isolation structure in the interlayer dielectric layer between adjacent dummy gate structures, where the isolation structure further extends into the base; after forming the isolation structure, removing the dummy gate structure and forming a gate opening in the interlayer dielectric layer; filling a gate electrode material into the gate opening, where the gate electrode material further covers the top of the interlayer dielectric layer; and performing at least one polishing treatment to remove the gate electrode material above the top of the interlayer dielectric layer and retaining the gate electrode material in the gate opening as a gate electrode layer, where the step of the

Abstract: A semiconductor structure and a method for forming same, the forming method including: providing a base, where a dummy gate structure is formed on the base, an interlayer dielectric layer is formed on the base the dummy gate structure exposes, and the interlayer dielectric layer exposes the top of the dummy gate structure; forming an isolation structure in the interlayer dielectric layer between adjacent dummy gate structures, where the isolation structure further extends into the base; after forming the isolation structure, removing the dummy gate structure and forming a gate opening in the interlayer dielectric layer; filling a gate electrode material into the gate opening, where the gate electrode material further covers the top of the interlayer dielectric layer; and performing at least one polishing treatment to remove the gate electrode material above the top of the interlayer dielectric layer and retaining the gate electrode material in the gate opening as a gate electrode layer, where the step of the

Abstract: A flywheel based energy storage apparatus includes a housing and a hub-less flywheel mounted within the housing. The hub-less flywheel has a mass which is shifted radially outwards from a central axis of the hub-less flywheel thus increasing the energy density of the apparatus. The flywheel includes an outer axially extending annular surface, an inner axially extending surface and two radially extending side surfaces. The inner axially extending surface has a plurality of magnets aligned to form a rotor. A plurality of coils is supported by the housing and is aligned with the rotor to form a motor/generator. A controller controls the motion of the hub-less flywheel to reduce vibrations and controls electrical power transfer to and from the motor/generator.

Abstract: This disclosure describes systems and methods for recommending bundles of items to users. A bundle can include an item that is substitutable for an item selected by a user and one or more related items that complement the substitutable item. For example, if a user has selected a wireless device on a page of a network application, a bundle recommendation can be provided that includes a similar wireless device and related accessories, a compatible service plan, and the like. Recommending bundles of items can be beneficial for providing users with access to items that they might like to purchase together, without requiring users to separately find each item.

Abstract: This disclosure describes systems and methods for recommending bundles of items to users. A bundle can include an item that is substitutable for an item selected by a user and one or more related items that complement the substitutable item. For example, if a user has selected a wireless device on a page of a network application, a bundle recommendation can be provided that includes a similar wireless device and related accessories, a compatible service plan, and the like. Recommending bundles of items can be beneficial for providing users with access to items that they might like to purchase together, without requiring users to separately find each item.

Abstract: A flywheel based energy storage apparatus and method are disclosed. The flywheel based energy storage apparatus includes a housing and a hub-less flywheel mounted within the housing. The hub-less flywheel has a mass which is shifted radially outwards from a central axis of the hub-less flywheel thus increasing the energy density of the apparatus. The flywheel includes an outer axially extending annular surface, an inner axially extending surface and two radially extending side surfaces. The inner axially extending surface has a plurality of magnets aligned to form a rotor. A plurality of coils is supported by the housing and is aligned with the rotor to form a motor/generator. A controller controls the motion of the hub-less flywheel to reduce vibrations and controls electrical power transfer to and from the motor/generator.

Abstract: A pad conditioner is provided for conditioning a polishing pad in chemical mechanical planarization (CMP). The pad conditioner comprises a plastic abrasive portion having a first hardness and optionally a brush portion having a second hardness less than the first hardness. The plastic abrasive portion comprises a base plate and a plurality of plastic nodules formed on a surface of the base plate, each of the plastic nodules having a planar top surface, wherein the planar top surface is positioned to substantially contact a polishing pad. The brush portion may be positioned adjacent to the plastic abrasive portion, the brush portion having a plurality of brush elements positioned to substantially contact the pad.

Abstract: One embodiment provides a retaining ring assembly. The retaining ring assembly comprises a retaining ring configured to circumferentially surround and retain the substrate within an inner surface of the retaining ring, and a flexure coupled to the retaining ring. The flexure is configured to maintain a gap between an inner surface of a carrier ring and an outer surface of the retaining ring, and the carrier ring is circumferentially surrounding the retaining ring.

Abstract: One embodiment provides a retaining ring assembly. The retaining ring assembly comprises a retaining ring configured to circumferentially surround and retain the substrate within an inner surface of the retaining ring, and a flexure coupled to the retaining ring. The flexure is configured to maintain a gap between an inner surface of a carrier ring and an outer surface of the retaining ring, and the carrier ring is circumferentially surrounding the retaining ring.