Abstract: A power steering device for inflatable boat includes a boat body, an underwater propeller is fixed on one side of the bottom surface of the boat body, a rudder is arranged on the other side of the bottom surface of the boat body, and a swinging handle is provided on the top surface of the boat body, a swinging joint is fixed to one end of the swinging handle, and the swinging joint and the swinging handle are connected by a connection mechanism, the boat body is provided with a mounting hole passed through the boat body, and the rudder and the swinging joint are respectively mounted two openings of the mounting hole, and the rudder is fixed to the swinging joint so as to rotate synchronously.

Abstract: A rotary inflating and deflating pump includes a housing and a pump core, the housing is provided with a chamber therein, the inner bottom wall of the chamber is provided with a housing hole; the pump core includes a pump shell and a driving member; the pump shell is detachably installed into the pump shell; a pump chamber is provided inside the pump shell, and an inlet hole and an outlet hole are provided on one end of the pump shell near the housing hole and respectively communicated with the pump chamber; the driving member is provided inside the pump chamber and used to drive gas to enter the pump chamber from the inlet hole and then flow out from the outlet hole; by rotating the pump core clockwise or counterclockwise, the pump can be changed to inflate or deflate, which is more convenient to use.

Abstract: A rotary inflating and deflating pump includes a housing and a pump core, the housing is provided with a chamber therein, the inner bottom wall of the chamber is provided with a housing hole; the pump core includes a pump shell and a driving member; the pump shell is detachably installed into the pump shell; a pump chamber is provided inside the pump shell, and an inlet hole and an outlet hole are provided on one end of the pump shell near the housing hole and respectively communicated with the pump chamber; the driving member is provided inside the pump chamber and used to drive gas to enter the pump chamber from the inlet hole and then flow out from the outlet hole; by rotating the pump core clockwise or counterclockwise, the pump can be changed to inflate or deflate, which is more convenient to use.

Abstract: Some aspects relate to technologies for category recommendation for a listing platform using a cascading category recommender. The cascading category recommender includes a candidate category model, a per-user category encoder, and a category prediction model. Given a sequence of interacted categories for a user, the candidate category model selects candidate categories from a category set that sets forth categories for item listings on a listing platform. The per-user category encoder generates a category embedding for each interacted category based on interacted items for the user corresponding to each interacted category. The category prediction model selects categories for recommendation using the candidate categories, the sequence of interacted categories, and the category embeddings.

Abstract: An integrated inflating and deflating pump includes an outer cylinder, a one-way valve mechanism arranged at a bottom of the outer cylinder, and an inflating and deflating mechanism placed in the outer cylinder in a forward or reverse direction; the outer cylinder is connected to a product to be inflated or deflated; the inflating and deflating mechanism has an air inlet; when the inflating and deflating mechanism is placed in the forward direction, the air inlet is close to the product, the one-way valve mechanism seals the outer cylinder, the inflating and deflating mechanism deflates the product; when the inflating and deflating mechanism is placed in the reverse direction, the air inlet is close to the one-way valve mechanism, the one-way valve mechanism is opened, the outer cylinder is in communication with the outside, and the inflating and deflating mechanism inflates the product.

Abstract: An integrated inflating and deflating pump includes an outer cylinder, a one-way valve mechanism arranged at a bottom of the outer cylinder, and an inflating and deflating mechanism placed in the outer cylinder in a forward or reverse direction; the outer cylinder is connected to a product to be inflated or deflated; the inflating and deflating mechanism has an air inlet; when the inflating and deflating mechanism is placed in the forward direction, the air inlet is close to the product, the one-way valve mechanism seals the outer cylinder, the inflating and deflating mechanism deflates the product; when the inflating and deflating mechanism is placed in the reverse direction, the air inlet is close to the one-way valve mechanism, the one-way valve mechanism is opened, the outer cylinder is in communication with the outside, and the inflating and deflating mechanism inflates the product.

Abstract: A modified zeolite material used for removing metal impurities from an organic solvent composition; the modified zeolite material comprising (i) a hydrogen-based zeolite having hydrogen functionalities, (ii) an ammonium-based zeolite having ammonium functionalities, or (iii) a combination of a hydrogen-based zeolite having hydrogen functionalities and an ammonium-based zeolite having ammonium functionalities; the zeolite material containing a pore size of from 3 ? to 20 ?; and the zeolite material selectively removing metal impurities present in the solvent, to an impurity content of less than 1 ppb; a process for preparing the above modified zeolite material; and a process for removing contaminants from organic solvents using the above modified zeolite material.

Abstract: A power steering device for inflatable boat includes a boat body, an underwater propeller is fixed on one side of the bottom surface of the boat body, a rudder is arranged on the other side of the bottom surface of the boat body, and a swinging handle is provided on the top surface of the boat body, a swinging joint is fixed to one end of the swinging handle, and the swinging joint and the swinging handle are connected by a connection mechanism, the boat body is provided with a mounting hole passed through the boat body, and the rudder and the swinging joint are respectively mounted two openings of the mounting hole, and the rudder is fixed to the swinging joint so as to rotate synchronously.