Abstract: A method for generating a model for recommendations from an item data set for a target data set includes embedding a set of targets from the target data set in a shared coordinate space using a first embedding function, embedding a first set of items from the item data set in the shared coordinate space using a second embedding function, selecting at least one target from the set of targets, and identifying a second set of items from the first set of items that are proximate to the at least one target as candidates from the recommendations.

Abstract: Provided are a filtration device and an air conditioner. The filtration device is applied in the air conditioner, and includes a frame and a filtration structure. The filtration structure is detachably connected to the frame by a first buckle. The frame is configured to be mounted at a housing of the air conditioner. In the filtration device according to the present disclosure, the filtration structure is detachably connected to the frame by the first buckle. After the filtration device is used for a period of time, a user can disassemble the filtration structure for cleaning, maintenance, or replacement.

Abstract: A power transformation apparatus between DC light element and ballast is provided, including: a first inductance, a second inductance, and a rectifier module. The first inductance includes a first input end and a second input terminal, and at least one of the first input terminal and the second input terminal is electrically connected to an output terminal of the ballast. The second inductance has a third input terminal and a fourth input terminal, and at least one of the third input terminal and the fourth input terminal is electrically connected to another output end of the ballast. The rectifier module has two input terminals, and the two input terminals are electrically connected to the first inductance and the second inductance, respectively. The rectifier module inputs a rectified direct current, so as to provide the electricity to the DC light elements. When the ballast is electrical ballast, the impedance value of the first inductance and the second inductance are between 150? and 800?.

Abstract: A power transformation apparatus between DC light element and ballast is provided, including: a first inductance, a second inductance, and a rectifier module. The first inductance includes a first input end and a second input terminal, and at least one of the first input terminal and the second input terminal is electrically connected to an output terminal of the ballast. The second inductance has a third input terminal and a fourth input terminal, and at least one of the third input terminal and the fourth input terminal is electrically connected to another output end of the ballast. The rectifier module has two input terminals, and the two input terminals are electrically connected to the first inductance and the second inductance, respectively. The rectifier module inputs a rectified direct current, so as to provide the electricity to the DC light elements. When the ballast is electrical ballast, the impedance value of the first inductance and the second inductance are between 150? and 800?.

Abstract: Disclosed is a supported nonmetallocene catalyst and preparation thereof. The supported nonmetallocene catalyst is characterized by a high catalyst activity for olefin polymerization and a significant monomer effect. Further disclosed is use of the supported nonmetallocene catalyst in olefin homopolymerization/copolymerization. The polymer produced therewith is characterized by superior particle morphology, a high bulk density, and/or a narrow molecular weight distribution.

Abstract: A lighting device is provided. The lighting device includes a switch-mode power supply module, an electronic ballast power supply module, a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, a fourth single-pole double-throw switch, and a direct-current driven lighting module. The lighting device is connected with the ballast, one input of the ballast is connected to an AC power supply. The switch-mode power supply module and the electronic ballast power supply module are used to convert AC into DC. The common end of four single-pole double-throw switch is connected with the ballast. When the ballast is an inductive ballast, the common end of four single-pole double-throw switch is connected to the input of the switch-mode power supply module. When the ballast is the electronic ballast, the common end of four single-pole double-throw switch is connected to the output of the electronic ballast power modules.

Abstract: A lighting device is provided. The lighting device includes a switch-mode power supply module, an electronic ballast power supply module, a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, a fourth single-pole double-throw switch, and a direct-current driven lighting module. The lighting device is connected with the ballast, one input of the ballast is connected to an AC power supply. The switch-mode power supply module and the electronic ballast power supply module are used to convert AC into DC. The common end of four single-pole double-throw switch is connected with the ballast. When the ballast is an inductive ballast, the common end of four single-pole double-throw switch is connected to the input of the switch-mode power supply module. When the ballast is the electronic ballast, the common end of four single-pole double-throw switch is connected to the output of the electronic ballast power modules.

Abstract: This invention relates to a supported nonmetallocene catalyst and preparation thereof. The supported nonmetallocene catalyst can be produced with a simple and feasible process and is characterized by an easily controllable polymerization activity. This invention further relates to use of the supported nonmetallocene catalyst in olefin homopolymerization/copolymerization, which is characterized by a lowered assumption of the co-catalyst as compared with the prior art.

Abstract: Disclosed is a supported nonmetallocene catalyst and preparation thereof. The supported nonmetallocene catalyst is characterized by a high catalyst activity for olefin polymerization and a significant monomer effect. Further disclosed is use of the supported nonmetallocene catalyst in olefin homopolymerization/copolymerization. The polymer produced therewith is characterized by superior particle morphology, a high bulk density, and/or a narrow molecular weight distribution.

Abstract: This invention relates to a supported nonmetallocene catalyst and preparation thereof. The supported nonmetallocene catalyst can be produced with a simple and feasible process and is characterized by an easily controllable polymerization activity. This invention further relates to use of the supported nonmetallocene catalyst in olefin homopolymerization/copolymerization, which is characterized by a lowered assumption of the co-catalyst as compared with the prior art.