Abstract: A pyridyl-containing compound represented by formula I and a preparation method therefor, and the use thereof in the preparation for a drug for treating tumors.

Abstract: A double-sided ultrasonic rolling cooperative strengthening system and a control method thereof are provided. The system includes a first mechanical arm subsystem, a second mechanical arm subsystem, a first ultrasonic rolling strengthening subsystem, a second ultrasonic rolling strengthening subsystem and a servo turntable (13); the servo turntable (13) is configured to fix a blade to be processed; the first ultrasonic rolling strengthening subsystem is provided at an end of the first mechanical arm subsystem; and the second ultrasonic rolling strengthening subsystem is provided at an end of the second mechanical arm subsystem.

Abstract: A double-sided ultrasonic rolling cooperative strengthening system and a control method thereof are provided. The system includes a first mechanical arm subsystem, a second mechanical arm subsystem, a first ultrasonic rolling strengthening subsystem, a second ultrasonic rolling strengthening subsystem and a servo turntable (13); the servo turntable (13) is configured to fix a blade to be processed; the first ultrasonic rolling strengthening subsystem is provided at an end of the first mechanical arm subsystem; and the second ultrasonic rolling strengthening subsystem is provided at an end of the second mechanical arm subsystem.

Abstract: An internal power generation circuit comprises: a first internal power generation circuit, configured to generate a first power signal based on an external power signal, and including an NMOS transistor, voltage of the first power signal being lower than voltage of the external power signal by threshold voltage of one NMOS transistor, wherein the circuit further includes: a booster unit performing boosting on the first power signal, voltage of a boosted signal being higher than the voltage of the first power signal by at least the threshold voltage of one NMOS transistor; a self-starting feedback circuit configured to generate an output voltage signal based on the boosted signal and the external power signal, wherein before the output voltage signal reaches a target voltage, the output voltage signal follows the external power signal, and after the output voltage signal reaches the target voltage, the output voltage signal holds the target voltage.

Abstract: A method for conveying and dropping seedlings based on a device for conveying and positioning a seedling tray of an automatic transplanter, wherein the device for conveying and positioning the seedling tray of the automatic transplanter includes a platform for conveying the seedling tray, a first sensor, a second sensor, a plurality of push rods, and a control system. The platform is configured for conveying the seedling tray to be below seedling picking claws. The push rods are evenly distributed on the platform. The seedling tray is placed between adjacent two of the push rods. The first sensor is mounted close to the seedling picking claws and configured for identifying the seedling tray. The second sensor is mounted on a rack of the platform for conveying the seedling tray and configured for identifying the push rods. The control system controls the platform for conveying the seedling tray.

Abstract: Embodiments of the present disclosure relate to projection stabilization systems and maskless lithography systems having projection stabilization systems. The projection stabilization system compensates for propagating vibrations that move image projection systems (IRS's). The IRS's are in a processing positon prior to operation of the maskless lithography process. One or more stiffeners are coupled to the IPS. The one or more stiffeners apply pressure to flexures coupled to each stiffener. The flexures are coupled to the IPS to provide stabilization to the IPS during the operations of the maskless lithography process. For example, the one or more of stiffeners protect the IPS from vibrations that propagate through the system during operation.

Abstract: A method for conveying and dropping seedlings based on a device for conveying and positioning a seedling tray of an automatic transplanter is provided. The device for conveying and positioning the seedling tray of the automatic transplanter includes a platform for conveying the seedling tray, a first sensor, a second sensor, a plurality of push rods, and a control system. The platform is configured for conveying the seedling tray to be below seedling picking claws. The push rods are evenly distributed on the platform. The seedling tray is placed between adjacent two of the push rods. The first sensor is mounted close to the seedling picking claws and configured for identifying the seedling tray. The second sensor is mounted on a rack of the platform for conveying the seedling tray and configured for identifying the push rods. The control system controls the platform for conveying the seedling tray.

Abstract: An optical-resolution photoacoustic microscopy (OR-PAM) system for visualizing water content deep in biological tissue uses an all-fiber 1930-nm hybrid optical parametrically-oscillating emitter. The emitter includes a tunable laser source whose output is amplified by a first erbium-doped fiber amplifier (EDFA). The output of the first amplifier is modulated with a Mach-Zehnder amplitude modulator that receives an RF signal with a nanosecond pulse width and a multiple kilohertz repetition rate. A second EDFA further amplifies the signal and passes it to a fiber circulator that in turn delivers it to a 1950/1550 mm fiber wavelength-division-multiplexing coupler WDM. The coupler introduces the signal to a cavity that includes a spool of highly nonlinear fiber and a Thulium-doped fiber amplifier TDFA. From the TDFA the signal reaches a 50/50 fiber coupler that sends part to a second output TDFA and guides part back to the cavity through a port of the WDM.