Abstract: Broadly applicable and stereoselective formation of glycosidic linkage remains challenging yet of critical importance in giycoscience. By developing an SN2 glycosylation, this work advances a general solution to this challenge via stereoinversion at the anomeric position of glycosyl ester donors. This SN2 process is enabled by a basic directing-group in the leaving-group, which is activated by a cationic gold catalyst or any other electrophilic reagent. Unlike all the reported directing group approaches, this strategy is applicable to any glycosyl donors—a long sought-after yet unmet goal in carbohydrate chemistry; moreover, the basic directing-group upon glycosylation is lost as part of the leaving-group and hence traceless in the glycoside products, therefore avoiding potential complications in downstream transformations. Highly selective construction of glycosidic bonds including challenging 1,2-cis glycosidic bonds is achieved in excellent yields.

Abstract: Disclosed are a special tooling and method for electron beam welding of a cavity body and a beam tube of a superconducting niobium cavity. The special tooling includes a first clamping device for fixing a flange and a second clamping device for fixing a semi-cavity body, wherein the first clamping device and the second clamping device are fixedly connected. A pressing ring of the first clamping device is disposed around a beam tube of a superconducting niobium cavity and cooperates with a base plate to clamp and fix the flange. The second clamping device includes clamping arms evenly distributed along a circumference of the semi-cavity body, and each clamping arm includes a second pressing plate axially disposed along the beam tube and a pressing block that is disposed on an end portion of the second pressing plate and fixes an edge of the semi-cavity body.

Abstract: Systems and techniques are described for depth sensing. For example, a method can include obtaining a first depth image of a scene. The first depth image of the scene is associated with a first illumination configuration including illuminating the scene with a first type of illumination. The method can include obtaining a second depth image of the scene, wherein the second depth image is associated with a second illumination configuration, different from the first illumination configuration. The second illumination configuration includes illuminating the scene with a second type of illumination. The method can include determining, based on the second depth image, multipath interference (MPI) associated with the first depth image. The method can further include generating based on determining the MPI associated with the first depth image an adjusted depth image including one or more pixels from the first depth image and one or more adjusted pixels.

Abstract: A purification method of a recovered aluminum melt for an automobile hub includes nitrogen degassing of a gas permeable brick pouring ladle bottom layer arranged on a lower portion of a gas permeable brick pouring ladle and argon degassing of a rotor degasser arranged on an upper portion. The invention has a good degassing and deslagging effect and high purification efficiency, and achieves energy conservation and environmental protection.

Abstract: A light-emitting diode (LED) includes a semiconductor structure, a transparent conducting layer, a first electrode, and a second electrode. The semiconductor structure has a lower surface and an upper surface, and includes a first semiconductor layer, an active layer, and a second semiconductor layer that are sequentially stacked in a laminating direction from the lower surface to the upper surface. The transparent conducting layer is located on the second semiconductor layer. The first electrode is located on the first semiconductor layer. The second electrode is located on the transparent conducting layer. When viewing the semiconductor structure and the transparent conducting layer from above the LED. The semiconductor structure has a shortest side with a length of X ?m.

Abstract: The disclosure relates to an omni-directional horizontally oriented deflecting tool for a coiled tubing, which includes an inner central pipe, an outer central pipe, a conical outer cylinder, a piston outer cylinder, an anchoring mechanism, a sealing mechanism, a reversing mechanism and a steering mechanism. The anchoring mechanism includes a cone, an O-shaped sealing ring I, a cone spring, a slip, a slip spring, a slip seat, a claw I and a pin shaft I, and the sealing mechanism includes a piston, an O-shaped sealing ring II, a claw II, a pin shaft II, an upper rubber cylinder seat, a rubber cylinder, a connecting cylinder, a lower rubber cylinder seat and a gasket.

Abstract: A clock spread spectrum circuit, an electronic equipment, and a clock spread spectrum method are disclosed. The clock spread spectrum circuit includes a control circuit, a signal generation circuit, and a duty cycle adjustment circuit. The duty cycle adjustment circuit is configured to generate a target voltage having a duty cycle that is equal to a target duty cycle, the control circuit is configured to generate a frequency control word according to a modulation parameter, and the frequency control word changes discretely with time; and the signal generation circuit is configured to receive the target voltage and the frequency control word and generate and output a spread spectrum output signal that is spectrum-spread according to the target voltage and the frequency control word, and the spread spectrum output signal corresponds to the frequency control word and a duty cycle of the spread spectrum output signal is the target duty cycle.

Abstract: A clock spread spectrum circuit, an electronic equipment, and a clock spread spectrum method are disclosed. The clock spread spectrum circuit (10) includes a control circuit (11) and a signal generation circuit (12). The control circuit (11) is configured to generate a frequency control word according to a modulation parameter, and the frequency control word changes discretely with time; and the signal generation circuit (12) is configured to receive the frequency control word and generate and output a spread spectrum output signal that is spectrum-spread according to the frequency control word, and the spread spectrum output signal corresponds to the frequency control word.

Abstract: A device includes a storage unit and a processing unit. The processing unit includes a processor and is coupled to the storage unit. The processing unit operates a big operating system (BOS) and a little operating system (LOS) and can dynamically switch between the BOS and the LOS according to the system loading status of the device, wherein power consumption and resource requirements of the BOS are different than those of the LOS.

Abstract: The disclosure provides an apparatus and method for resuming playing of a media source, where if a smart televisions switches from a first media source to a second media source, then buffered video data after the position where the first media source is being played while it is being switched will be obtained and stored. Since the buffered video data can be played for a period of time longer than the playing-start time of the media source, if the smart television switches from the second media source back to the first media source, then the buffered video data will be played, and playing of the first media source will be resumed from the end position of the buffered video data in the media source.

Abstract: A device includes a storage unit and a processing unit. The processing unit includes a processor and is coupled to the storage unit. The processing unit operates a big operating system (BOS) and a little operating system (LOS) and can dynamically switch between the BOS and the LOS according to the system loading status of the device, wherein power consumption and resource requirements of the BOS are different than those of the LOS.

Abstract: A low-power wearable device includes a storage unit and a processing unit. The processing unit includes a processor and is coupled to the storage unit. The processing unit operates a big operating system (BOS) and a little operating system (LOS) and can dynamically switch between the BOS and the LOS according to the system loading status of the wearable device, wherein power consumption and resource requirements of the BOS are different than those of the LOS.

Abstract: The disclosure provides an apparatus and method for resuming playing of a media source, where if a smart televisions switches from a first media source to a second media source, then buffered video data after the position where the first media source is being played while it is being switched will be obtained and stored. Since the buffered video data can be played for a period of time longer than the playing-start time of the media source, if the smart television switches from the second media source back to the first media source, then the buffered video data will be played, and playing of the first media source will be resumed from the end position of the buffered video data in the media source.

Abstract: A low-power wearable device includes a storage unit and a processing unit. The processing unit includes a processor and is coupled to the storage unit. The processing unit operates a big operating system (BOS) and a little operating system (LOS) and can dynamically switch between the BOS and the LOS according to the system loading status of the wearable device, wherein power consumption and resource requirements of the BOS are different than those of the LOS.