Abstract: According to the embodiments of the present disclosure, a method for conversion evaluation comprises: extracting a resource feature from resource-related data of a target resource; extracting an audience feature of the target audience group from audience-related data of a target audience group of the target resource, the target audience group being to be distributed with a recommended content item related to the target resource; and determining, based on the resource feature and the audience feature, a target predicted conversion rate for the target resource through a predetermined association between resource features, audience features and predicted conversion rates, the target predicted conversion rate indicating a predicted probability of the target audience group performing a conversion for the target resource. According to the scheme, the accuracy of the conversion rate evaluation may be improved, thereby improving distribution effect of the recommended content item for a resource.

Abstract: A control method and control device for a heat pump-type double-circulation hot-air drying system, relating to a device for supplying or controlling air or gas for drying solid materials or products, and in particular to a control method and control device for a heat pump-type hot-air drying system. The method comprises: configuring a temperature control parameter, and saving a preset temperature control curve parameter; detecting and monitoring an outlet air temperature, and the temperature and humidity of a drying room; dynamically adjusting a set temperature according to a preset temperature control curve; and selecting, according to a current set temperature, a double-circulation dynamic operation mode of a system. The control device uses a micro-processor to realize program control. By building an inner circulation loop for large-volume air circulation, the latent heat of condensation in a refrigerant is fully absorbed, to improve the basic air temperature.

Abstract: Disclosed are a multi-stage gravity-type sludge drying apparatus and a sludge drying method using the same. The drying apparatus includes: a dryer, a preheater, a steam generator, a filter, a steam or water separation buffer tank, a steam compressor, a cooling water pump, a sealed discharge device, pipes and valves. The dryer includes several indirect dryer modules. The transportation of sludge in the dryer is achieved by gravity. The inner cavity of respective indirect dryers is filled with high-temperature steam to dry the sludge by indirect heating. The condensate water in the cavity is recycled and fed into the preheater to perform preheating and impurity removal on the wet sludge. The secondary steam generated in the dryer is filtered, compressed and overheated to become a new heat source for indirect heating in the cavity and convection drying at a bottom of the dryer.

Abstract: Disclosed are a multi-stage gravity-type sludge drying apparatus and a sludge drying method using the same. The drying apparatus includes: a dryer, a preheater, a steam generator, a filter, a steam or water separation buffer tank, a steam compressor, a cooling water pump, a sealed discharge device, pipes and valves. The dryer includes several indirect dryer modules. The transportation of sludge in the dryer is achieved by gravity. The inner cavity of respective indirect dryers is filled with high-temperature steam to dry the sludge by indirect heating. The condensate water in the cavity is recycled and fed into the preheater to perform preheating and impurity removal on the wet sludge. The secondary steam generated in the dryer is filtered, compressed and overheated to become a new heat source for indirect heating in the cavity and convection drying at a bottom of the dryer.

Abstract: A control method and control device for a heat pump-type double-circulation hot-air drying system, relating to a device for supplying or controlling air or gas for drying solid materials or products, and in particular to a control method and control device for a heat pump-type hot-air drying system. The method comprises: configuring a temperature control parameter, and saving a preset temperature control curve parameter; detecting and monitoring an outlet air temperature, and the temperature and humidity of a drying room; dynamically adjusting a set temperature according to a preset temperature control curve; and selecting, according to a current set temperature, a double-circulation dynamic operation mode of a system. The control device uses a micro-processor to realize program control. By building an inner circulation loop for large-volume air circulation, the latent heat of condensation in a refrigerant is fully absorbed, to improve the basic air temperature.

Abstract: The present invention relates to a toothbrush and provides an electric toothbrush comprising a hollow hand-held casing; the hand-held casing is disposed therein with a rechargeable lithium battery via a battery mount, and a brushless motor via a motor mount. The battery mount accommodates a PCT connected with the rechargeable lithium battery. The PCB is disposed with a control switch via a waterproof mount and a waterproof switch case. The press portion of the control switch is exposed from the switch hole of the hand-held casing. The vibration shaft of the brushless motor passes through the motor mount to an exterior of the hand-held casing. The vibration shaft is connected to a toothbrush head. The hand-held casing is threadedly connected to the rear cap at a bottom end thereof. The hand-held casing has a cross section in shape of a circle.

Abstract: The present invention relates to a toothbrush and provides an electric toothbrush comprising a hollow hand-held casing; the hand-held casing is disposed therein with a rechargeable lithium battery via a battery mount, and a brushless motor via a motor mount. The battery mount accommodates a PCT connected with the rechargeable lithium battery. The PCB is disposed with a control switch via a waterproof mount and a waterproof switch case. The press portion of the control switch is exposed from the switch hole of the hand-held casing. The vibration shaft of the brushless motor passes through the motor mount to an exterior of the hand-held casing. The vibration shaft is connected to a toothbrush head. The hand-held casing is threadedly connected to the rear cap at a bottom end thereof. The hand-held casing has a cross section in shape of a circle.