Abstract: A projection system includes a control module, a projection tube, an aiming driver, an observation device and an observation driver. The control module is configured to issue a first control command and a second control command. The aiming driver is electrically connected to the projection tube and configured to control, in response to the first control command, a projection viewing-line of the projection tube to be aligned with a calibration point. The observation driver is electrically connected to the observation device and configured to control, in response to the second control command, an observation viewing-line of the observation device to be aligned with the calibration point. The projection tube and the observation device are controlled asynchronously.

Abstract: A kinematics model-free trajectory tracking method for a robotic arm includes the following steps. Obtain an actual trajectory equation ra(t) of the robotic arm at time t according to a sensor, and combines the actual trajectory equation ra(t) with a predetermined target trajectory equation rd(t) to obtain a first error function e(t). Obtain a differential equation (I) of a state change rate of a driver of the robotic arm. Obtain a second error function ?(t). Pass the second error function c(t) through the applied gradient neural network to obtain equation (IV). Jointly solve equation (I) and equation (IV) to obtain an joint state vector ?(t) of the robotic arm. Drive a motion of the robotic arm by a controller according to the joint state vector ?(t) of the robotic arm to complete trajectory tracking.

Abstract: A photonic-crystal resonator (PhCR) and associated methods of design and manufacture. The PhCR includes spontaneous optical-pulse generation and includes a ring whose geometry is correlated to a mode structure or dispersion of the PhCR while also taking into account a desired type of nonlinear optical output from the PhCR, such as an optical frequency comb, or a particular type of pulse. The PhCR includes a periodic nanopatterning on an inner radial wall of its ring and is able to spontaneously generate a nonlinear optical output. The nanopatterning of the inner radial wall is designed to form a desired output, such as one of a classic soliton pulse that has a sech type temporal profile, or a gaussian profile, or a sink pulse profile.

Abstract: A display device including a substrate, a cholesteric liquid crystal layer, and a transparent electrode layer that are sequentially stacked is provided. The cholesteric liquid crystal layer includes cholesteric liquid crystal molecules and a plurality of transparent photoresist structures. Each of the transparent photoresist structures is a closed structure, and the cholesteric liquid crystal molecules are respectively accommodated in a plurality of patterned areas respectively surrounded by the transparent photoresist structures, so as to form a plurality of cholesteric liquid crystal patterns. The transparent electrode layer includes a plurality of sub-electrodes. The cholesteric liquid crystal patterns are respectively driven by the sub-electrodes. An orthogonal projection of each of the transparent photoresist structures on the substrate falls in an orthogonal projection of a corresponding sub-electrode of the sub-electrodes on the substrate.

Abstract: A projection system includes a control module, a projection tube, an aiming driver, an observation device and an observation driver. The control module is configured to issue a first control command and a second control command. The aiming driver is electrically connected to the projection tube and configured to control, in response to the first control command, a projection viewing-line of the projection tube to be aligned with a calibration point. The observation driver is electrically connected to the observation device and configured to control, in response to the second control command, an observation viewing-line of the observation device to be aligned with the calibration point. The projection tube and the observation device are controlled asynchronously.

Abstract: A digital currency payment method and system, and an apparatus, a security chip, and an application method, which relate to the technical field of computers. The payment method includes: generating a transaction amount, or acquiring, by means of a communication connection between a first client and a second client, the transaction amount sent by the second client; and sending a payment request to the second client by means of the communication connection, where the payment request indicates a first digital currency corresponding to the transaction amount or a circulation identifier of the first digital currency, so as to enable a second currency management apparatus corresponding to the second client to cash a second digital currency corresponding to the transaction amount to a first currency management apparatus corresponding to the first client.

Abstract: In a general aspect, a system for measuring radio frequency (RF) electromagnetic waves includes a laser system configured to generate plurality of input optical signals. The system also includes an RF measurement device having first and second mode converters and an internal cavity therebetween. The internal cavity contains a vapor that is configured to produce an output optical signal based on the plurality of input optical signals. The RF measurement device also includes an RF waveguide that extends between the first and second mode converters and is configured to carry the second RF waveguide mode through the internal cavity. The system also includes an optical detector system configured to generate a detector signal in response to receiving the output optical signal. The system additionally includes a signal processing system configured to generate data in response to receiving the detector signal.

Abstract: The invention provides an electrode having a conformal polymer layer disposed thereon, wherein the conformal polymer layer has a thickness of 3 to 10,000 nm and includes: a polymer comprising one or more zwitterionic moieties; and/or fluorinated polymer. Also provided are energy storage devices comprising the inventive electrode, methods of preparing the electrode and the energy storage device, and further methods, including methods of enhancing conformality and/or elasticity of a conformal polymer layer on an electrode.

Abstract: A decoration panel includes a first substrate, a first transparent conductive element, a transparent structure, a second substrate, a second transparent conductive element, and a first cholesteric liquid crystal layer. The first transparent conductive element is disposed on the first substrate. The transparent structure is disposed on the first substrate. The second substrate is disposed opposite to the first substrate. The second transparent conductive element is disposed on the second substrate. The first cholesteric liquid crystal layer is disposed between the first transparent conductive element and the second transparent conductive element. A display apparatus is adapted to render a decoration pattern, and the decoration pattern corresponds to the transparent structure. Moreover, a display apparatus including the decoration panel is also provided.

Abstract: In a general aspect, a radio frequency (RF) measurement device includes first and second mode converters, each configured to convert a mode of the RF electromagnetic wave between a first RF waveguide mode and a second RF waveguide mode. The RF measurement device also includes an internal cavity between the first and second mode converters that contains a vapor or a source of the vapor. The vapor includes Ryberg atoms or molecules. The RF measurement device additionally includes an RF waveguide extending between the first and second mode converters and configured to establish a circular polarization of the RF electromagnetic wave in the internal cavity.

Abstract: A computer-implemented method and system for optimally retraining a supervised machine learning model based on newly received data. The method comprises receiving, from a requestor device, a new data set for updating a previously-trained model generated using a first training data set and tested using a first testing data set. Then, the new data set is checked for components having an association to both the first training data set and the first testing data set; and where such components are found, they are deleted. Once all of the components of the new data have been examined, remaining components of the new data set are assigned to one of the first training or testing data set in dependence upon a relationship connectivity therewith to form at least one of an updated testing and training data set for building the updated model.

Abstract: A display device including a substrate, a cholesteric liquid crystal layer, and a transparent electrode layer that are sequentially stacked is provided. The cholesteric liquid crystal layer includes cholesteric liquid crystal molecules and a plurality of transparent photoresist structures. Each of the transparent photoresist structures is a closed structure, and the cholesteric liquid crystal molecules are respectively accommodated in a plurality of patterned areas respectively surrounded by the transparent photoresist structures, so as to form a plurality of cholesteric liquid crystal patterns. The transparent electrode layer includes a plurality of sub-electrodes. The cholesteric liquid crystal patterns are respectively driven by the sub-electrodes. An orthogonal projection of each of the transparent photoresist structures on the substrate falls in an orthogonal projection of a corresponding sub-electrode of the sub-electrodes on the substrate.

Abstract: Disclosed is an HDR film source playing method. The method includes following operations: determining state information of a color temperature control switch according to an application that is currently opened; playing an HDR film source on the application according to a color temperature of a display screen when the state information is on; and playing the HDR film source according to a color temperature corresponding to the application when the state information is off. Further disclosed are an HDR film source playing device and a computer-readable storage medium.

Abstract: A magnetic apparatus includes a first magnetic member, a second magnetic member, a first winding, and a second winding, where the first magnetic member includes a first magnetic cylinder, a second magnetic cylinder, a third magnetic cylinder, and at least one fourth magnetic cylinder, and where the first winding is wound around the first magnetic cylinder and the second magnetic cylinder, the second winding is wound around the first magnetic cylinder and the third magnetic cylinder, and a direction in which the first winding is wound around the second magnetic cylinder is opposite to a direction in which the second winding is wound around the third magnetic cylinder.

Abstract: A digital currency payment method and system, and an apparatus, a security chip, and an application method, which relate to the technical field of computers. The payment method includes: generating a transaction amount, or acquiring, by means of a communication connection between a first client and a second client, the transaction amount sent by the second client; and sending a payment request to the second client by means of the communication connection, where the payment request indicates a first digital currency corresponding to the transaction amount or a circulation identifier of the first digital currency, so as to enable a second currency management apparatus corresponding to the second client to cash a second digital currency corresponding to the transaction amount to a first currency management apparatus corresponding to the first client.

Abstract: A digital currency payment method and system, and an apparatus, a security chip, and an application method, which relate to the technical field of computers. The payment method includes: generating a transaction amount, or acquiring, by means of a communication connection between a first client and a second client, the transaction amount sent by the second client; and sending a payment request to the second client by means of the communication connection, where the payment request indicates a first digital currency corresponding to the transaction amount or a circulation identifier of the first digital currency, so as to enable a second currency management apparatus corresponding to the second client to cash a second digital currency corresponding to the transaction amount to a first currency management apparatus corresponding to the first client.

Abstract: Computer-implemented methods and systems for colour-based image tagging and colour-based searching. The method may include identifying, using image analysis, one or more dominant colours of a product based on an image of the product and receiving selection of at least one of the one or more dominant colours. In response to receiving the selection of the at least one of the one or more dominant colours, a search for products matching the at least one of the one or more dominant colours may be initiated to obtain one or more results of the searching, the one or more results including at least one product matching the at least one of the one or more dominant colours.

Abstract: When a merchant ships a product to a buyer, the merchant may wish to push shipping status updates to the buyer. Moreover, the buyer may wish to receive a notification when a shipping event has occurred in order to remain informed regarding the shipping status of their package without actively checking the package's status with the carrier. In some embodiments, there is provided a computer-implemented system and method that obtains a tracking identifier for a package, transmits the tracking identifier to a carrier's computing interface (e.g. the carrier's API), receives back an indication of the most recent shipping event, predicts the time of a next shipping event at least based on the most recent shipping event, and retransmits the tracking identifier to the computing interface based on the predicted time of the next shipping event.