4results about How to "Less energy consumption" patented technology

The invention relates to a preparation method of a caffeine impurity C. The preparation method of the caffeine impurity C can effectively solve the problems of preparation of the caffeine impurity C, effective control of impurity content in caffeine and guarantee of coffee quality, and the preparation method comprises the following steps: mixing theophylline, a catalyst triethylene diamine, N, N-dimethylformamide and dimethyl carbonate, heating for reaction, distilling, adding water for recrystallization, and filtering to obtain the caffeine impurity C. Recrystallized jellyfish liquid is obtained; and adding a halogenated hydrocarbon solvent, standing until a solid is separated out between the water layer and the halogenated hydrocarbon solvent layer, filtering, and drying to obtain the product. The invention provides the caffeine impurity preparation method which is simple and easy to implement, mild in condition and low in energy consumption and pollution, so that the preparation vacancy of the impurity at present is filled up, powerful technical support is provided for quality research and quality control of caffeine, and the method has practical popularization and application values.

The application discloses an air-to-air missile evading method based on drum maneuvering, and the aircraft performs drum maneuvering, the speed direction of the aircraft is opposite to that of the missile, and the missile attack is evaded; in the process of evading the missile, the aircraft obtains a guidance law of the aircraft according to current position and a desired motion trajectory, in the desired motion trajectory, the aircraft performs circular motion in a vertical plane and uniform motion in a forward direction. The air-to-air missile evading method based on drum maneuvering can realize drum evading action of the aircraft on the missile, and the evading effect is good.

The application discloses a variable-rigidity frame and relates to the technical field of automobile parts. The variable-rigidity frame comprises a first frame, a second frame, a first sliding block, a second sliding block, a third sliding block and a fourth sliding block. The first sliding block, the second sliding block, the third sliding block and the fourth sliding block are respectively hinged with a first sliding rod, a second sliding rod, a third sliding rod and a fourth sliding rod. The first sliding rod, the second sliding rod, the third sliding rod and the fourth sliding rod are respectively connected with a third arc spring, a first arc spring, a fourth arc spring and a second arc spring. The third arc spring, the first arc spring, the fourth arc spring and the second arc spring are respectively hinged with a second supporting rod, a first supporting rod, a fourth supporting rod and a third supporting rod. The variable-rigidity frame can conveniently and quickly change different configurations, so that the frame has different rigidity. Different from a traditional fixed frame, the variable-rigidity frame can meet the requirements of vehicle driving on different terrains, and greatly meets the requirements of current vehicle driving.

This invention provides a ducted air conditioner structure and control method. The ducted air conditioner structure is installed within a temperature-controlled space. A first mounting plate is connected to the top wall of the temperature-controlled space; an exhaust port is provided on the first mounting plate; a second mounting plate is connected to the side wall of the temperature-controlled space; the second mounting plate is connected to the first mounting plate, so that the first mounting plate, the second mounting plate, the top wall, and the side wall form an accommodating space; a ducted air conditioner housing is installed within the accommodating space; a ducted air conditioner assembly is used to allow airflow entering the ducted air conditioner housing from the air inlet to pass through heat exchange and then exit from the first air outlet; a damper component is used to guide the airflow within the ducted air conditioner housing, so that at least a portion of the airflow within the ducted air conditioner housing exits from the second air outlet, passes through the obstruction of the second mounting plate, and then enters the ducted air conditioner housing from the air inlet, thus solving the technical problem of excessive energy consumption in related technologies for ducted air conditioners.