Abstract: Provided is a GABAA receptor agonist phenol derivative that has a novel structure and better efficacy, can effectively reduce side effects, and is safer for clinical use. Specifically disclosed are a compound as represented by the following formula (I), a stereoisomer and pharmaceutically acceptable salt thereof, a pharmaceutical composition containing same, and an application of the compound or composition of the present invention in the central nervous field, thereby providing more and better choices for medicaments for inducing and/or maintaining anesthesia in animal or human bodies, facilitating sedation and hypnosis, and treating and/or preventing anxiety, nausea, vomiting, migraine, convulsion, epilepsy, neurodegenerative diseases, and central nervous system-related diseases.

Abstract: A low-heat-loss operation method of a line-focusing heat collection system and the line-focusing heat collection system are provided. The method includes the following steps. Solar energy is utilized to preheat a collector tube in an empty tube state, so that the collector tube is in a preheating mode. After a set preheating temperature is reached, a heat transfer working medium is injected into the collector tube. In the injection process of the heat transfer working medium, an injection section of the collector tube is converted into a focusing mode from a preheating mode. After heat collection is finished, the circulation of the heat transfer working medium is stopped, and the focusing mode of the collector tube is kept. In the drainage process of the heat transfer working medium, an emptying section of the collector tube is converted into a light heat-tracing mode from a focusing mode.

Abstract: Provided are a voice processing method and an apparatus, the method including: acquiring, during playback of a content of a first type, a first voice inputted by a user, where the first voice instructs a terminal to switch a played content to a content of a second type; and where the terminal plays a content of a predefined type before playing the content of the first type; playing a first reply voice according to the first voice, prompting the user to determine whether to continue to play the content of the second type after the content of the predefined type during a predefined period; and continuing to play a content of a target type after the content of the predefined type during the predefined period, where the target type is related to the user's feedback on the first reply voice, thus improving a reliability for the terminal.

Abstract: In the technical field of metal melting, a unisource high-strength ultrasound-assisted method for casting large-specification 2XXX series aluminum alloy round ingots applies in an ingot guiding process, a unisource high-strength ultrasonic vibration system to the center of a hot-top crystallizer, ultrasound directly acts on the center position of a crystallizer, and enough ultrasonic field energy is provided for a melt by controlling the power of the ultrasonic vibration system, so that an aluminum alloy solidification process is implemented under the effect of ultrasound, homogenization of microstructures and components of ingots is promoted, and the existing problems that microstructures are thick and crystal phases are enriched due to slow cooling of centers of large-specification round ingots are effectively solved, meanwhile, the problems of great operation difficulty and heavy workload during multisource ultrasonic coupling are avoided.

Abstract: Provided are a voice processing method and an apparatus, the method including: acquiring, during playback of a content of a first type, a first voice inputted by a user, where the first voice instructs a terminal to switch a played content to a content of a second type; and where the terminal plays a content of a predefined type before playing the content of the first type; playing a first reply voice according to the first voice, prompting the user to determine whether to continue to play the content of the second type after the content of the predefined type during a predefined period; and continuing to play a content of a target type after the content of the predefined type during the predefined period, where the target type is related to the user's feedback on the first reply voice, thus improving a reliability for the terminal.

Abstract: Embodiments of the present disclosure provide a method and a device for visually presenting data preloading, where the method includes: acquiring a current playback progress of digital media content; presenting a first icon on a progress bar of a player of the digital media content; determining a parameter that is used to indicate a data preloading speed of the digital media content; and presenting, at least one data point in the part, of the progress bar, that has not been played, so as to indicate the data preloading speed. According to the method and the device for visually presenting data preloading provided in the embodiments of the present disclosure, a parameter that is used to indicate a data preloading speed is acquired; therefore, visual presentation of data preloading can be implemented, so that a user can know the data preloading speed, and user experience can be effectively improved.

Abstract: A transconductance-enhancing passive frequency mixer comprises a transconductance amplification stage, a frequency mixing stage, and an output transresistance amplifier. The transconductance amplification stage has a pre-amplification transconductance-enhancing structure, so that the transconductance is greatly enhanced, thereby obtaining the same transconductance value at a lower bias current. A radio-frequency current is modulated by the frequency mixing stage to generate an output mid-frequency current signal. The mid-frequency current signal passes through the transresistance amplifier, to form voltage output, and finally obtain a mid-frequency voltage signal. The transresistance amplifier has a transconductance-enhancing structure, thereby further reducing input impedance, and improving current utilization efficiency and port isolation. The frequency mixer has the characteristics of low power consumption, high conversion gain, good port isolation, and the like.

Abstract: Embodiments of the present invention provide a text input method and apparatus. The method includes: presenting a text input interface on a display apparatus; detecting a first input of an input apparatus, where the first input is used to trigger a query of a text database; presenting, according to the first input, a text set image corresponding to the text database on the text input interface and displaying a cursor in a default position of the text set image, where the text set image includes texts arranged along a circle and the cursor is used to indicate a current selected text; detecting a second input, where the second input is used to select a text in the text set image; and presenting, according to the second input, an input set that matches the text selected in the text set image on the text input interface for inputting.

Abstract: A transconductance-enhancing passive frequency mixer comprises a transconductance amplification stage, a frequency mixing stage, and an output transresistance amplifier. The transconductance amplification stage has a pre-amplification transconductance-enhancing structure, so that the transconductance is greatly enhanced, thereby obtaining the same transconductance value at a lower bias current. A radio-frequency current is modulated by the frequency mixing stage to generate an output mid-frequency current signal. The mid-frequency current signal passes through the transresistance amplifier, to form voltage output, and finally obtain a mid-frequency voltage signal. The transresistance amplifier has a transconductance-enhancing structure, thereby further reducing input impedance, and improving current utilization efficiency and port isolation. The frequency mixer has the characteristics of low power consumption, high conversion gain, good port isolation, and the like.

Abstract: A test system emulates the analog processing portion of a communication device and adjusts input signals based on distortions specified by a user and control signals generated by a baseband processing portion of the communication device. The distortions can be specified in terms of the baseband. One or more of the control signals can be bypassed to investigate the effect of each of the control signals alone, or in various combinations. An operator interface can be provided that allows the user to set up and conduct the tests, and monitor the results. Facilities are also provided to allow the reference voltage at the baseband processing portion to be adjusted while maintaining the appropriate reference voltage for components in the test system.

Abstract: A test system emulates the analog processing portion of a communication device and adjusts input signals based on distortions specified by a user and control signals generated by a baseband processing portion of the communication device. The distortions can be specified in terms of the baseband. One or more of the control signals can be bypassed to investigate the effect of each of the control signals alone, or in various combinations. An operator interface can be provided that allows the user to set up and conduct the tests, and monitor the results.