Abstract: In an embodiment of the disclosure, there is provided a handheld vision tester for vision self-testing by a user. The handheld vision tester comprises a touchscreen display, a control, and an interface port. The touchscreen display is configured to present different shapes, either statically or dynamically, to the user for the vision self-testing. One of the different shapes may be a modulated version of another similar shape displayed at the same time and includes a modulated edge. The control is configured to allow a user to trigger operations of the tester and allow the user to select one of the different shapes. The handheld vision tester is configured to determine results of the vision self-testing from the user selections and store the results in the handheld vision tester. The interface port is configured to transmit the stored results to a healthcare provider who uses the results to enhance treatment routines.

Abstract: A pneumatic vibration device with a rotatable piston shaft comprises a piston body and a gas diverter. The piston body comprises a piston shaft, an input shaft and a piston cylinder body. The piston shaft comprises a hollow spindle with two ends connected to a first piston and a second piston through connection bearings respectively. The first piston and the second piston are connected through an inner sleeve. The spindle is connected to a rotary connection member. The input shaft stretches into the inner sleeve and is matched and connected with the rotary connection member. The gas diverter comprises a first gas diversion port and a second diversion port. The pneumatic vibration device is compact in structure and high in adaptability, and can realize rotation and vibration of drilling tools.

Abstract: Provided are a method and apparatus for evaluating insulation performance of a submarine cable, and a medium. The method includes: obtaining a first measured dielectric loss value, first current-limiting resistance, and first insulation resistance of a submarine cable; substituting the above parameters into an expression of the first measured dielectric loss value to calculate a first actual dielectric loss value, where the expression of the first measured dielectric loss value is calculated based on a preset expression of a total dielectric loss value, and the expression of the total dielectric loss value includes a first product and the to-be-solved first actual dielectric loss value; and evaluating insulation performance of the submarine cable based on the first actual dielectric loss value to obtain an insulation performance evaluation result. The present disclosure can solve a problem of low reliability of the insulation performance evaluation result of the submarine cable.

Abstract: An APFC converter control method includes: obtaining an output voltage, an input voltage and an inductor current of the APFC converter; obtaining a voltage adjustment value according to a voltage error value between a preset reference voltage and the output voltage; obtaining a reference current according to the voltage adjustment value and the input voltage; obtaining a current error value according to the reference current and the inductor current; obtaining an adjustment coefficient of the proportional integration parameter; adjusting an integration parameter and a proportional parameter according to the adjustment coefficient; calculating an output control value according to the integration parameter, the proportional parameter and the current error value; and comparing the control value with sawtooth harmonics to adjust the duty cycle and to output a PWM signal.

Abstract: Embodiments of the disclosure provide a method, an apparatus, a device and a storage medium for session interaction. The method includes: in a session between a user and a digital assistant, in response to receiving a first session message of the user, presenting a first reply message of the digital assistant for the first session message, the first reply message comprising first content, the first content being generated by a model based on a user requirement corresponding to the first session message; in response to receiving a collection request for the first content, adding the first content in the first reply message to a content collection page of the user; and in response to detecting a content viewing request, presenting second content in the content collection page, the second content being regenerated by the model based on the user requirement.

Abstract: Methods for fabricating coiled polymer fibers and yarns (high-spring-index coiled fibers and yarns). Methods include inserting twist separately into individual fibers or yarns, plying the fibers or yarns by inserting plying twist, setting the ply structure without permanently binding together the fibers or yarns of different plies so that the ply structure is substantially stable against untwist when torsionally untethered, and then unwrapping the plied fibers or yarns so that a high-spring-index fiber or yarn can be obtained. In some embodiments, the unwrapped fibers or yarns are further set so that these are further stabilized. The methods can eliminate the need for a mandrel, and can be quickly applied for applications where high-spring-index thermally-driven artificial muscles are presently employed, such as for presently commercialized comfort-adjusting jackets.

Abstract: Embodiments of the disclosure provide a method, an apparatus, a device and a storage medium for session interaction. The method includes: presenting, in a session between a user and a digital assistant, a reply message of the digital assistant for a session message of the user, the reply message including a summary content matching the session message; and in response to detecting the detail viewing operation on the summary content, presenting a detail content including an extension to the summary content. In this way, flexible viewing of the summary content and the detail content of the content can be supported in the session with the digital assistant, thereby improving an extended presentation manner of complex content.

Abstract: The embodiments of the disclosure provides methods, apparatuses, devices, and storage medium for message processing. The method includes: receiving, in an interaction between a user and a digital assistant, a conversation message of the user for the digital assistant; determining a processing result for the conversation message by a model, the processing result indicating target content matching a user requirement corresponding to the conversation message; and presenting, based on a first message presentation mode corresponding to an interaction channel in which the conversation message is received, a reply message of the digital assistant for the conversation message in the interaction channel, the reply message presenting at least a portion of the target content.

Abstract: Improved electrochemical yarn energy harvesters that convert mechanical energy to electrical energy. These harvesters include an ionically conducting electrolyte, and an electronically conducting material, and a material that can undergo charge injection, which can also be the electronically conducting material. At least one device electrode is either twisted, twisted and coiled, or twisted and plied.

Abstract: Previous electrochemically-powered yarn muscles cannot be usefully operated between extreme negative and extreme positive potentials, since strokes during electron injection and during hole injection partially cancel because they are in the same direction. Unipolar-stroke carbon nanotube yarn muscles are described in which muscle strokes are additive between extreme negative and extreme positive potentials, and stroke increases with potential scan rate. These electrochemical artificial muscles include an electrically conducting twisted or coiled yarn and a material that dramatically shifts the potential of zero charge of the electrochemically actuated yarn.

Abstract: A method and system for optimizing the charging process of lithium-ion batteries by utilizing a determined parameter (e.g., Lyapunov Exponent) as a cell degradation (e.g., anode overpotential) indicator are disclosed. The system and method enable intelligent charging, which may involve integrating a controller that adjusts the charging current in real-time (or near real time or otherwise) based on the cell degradation indicator, calculated from probing the battery. This approach has various possible benefits to which the method and system may be tuned including extending battery lifespan, charge timing, and safety.

Abstract: Aspects of the present disclosure involve methods, which may be to manage control of a battery such as through charging, comprising obtaining a value indicative of at least one of a dynamic state of equilibrium, periodic behavior, quasi-periodic behavior, chaotic behavior and random behavior of a battery, which may involve electrodynamic parameters of Lyapunov Exponent, Correlation Dimension, Sample Entropy and Hurst Exponent, among others, the value obtained from a voltage measurement or a current measurement from the battery, and based on the value, operating the battery to maintain the battery within one of the dynamic states.

Abstract: Disclosed is a rotatable ultrasonic vibration device. The ultrasonic vibration device includes: a shell; a hollow locking rod having a center hole; a piezoelectric transducer surrounding the hollow locking rod; a first amplitude-change pole mounted in the center hole, one end of the first amplitude-change pole being fixedly connected to the hollow locking rod, and at least a portion of the length of the first amplitude-change pole being located in the space surrounded by the piezoelectric transducer; an instrument rod connected to the other end of the first amplitude-change pole, an instrument working portion being located outside the shell and connected to the instrument rod, and the instrument rod being rotatable relative to the first amplitude-change pole; and a rotation transmission assembly rotatably mounted on the shell and matched with the instrument rod to transmit rotation torque to the instrument rod.

Abstract: A pneumatic vibration device with a rotatable piston shaft comprises a piston body and a gas diverter. The piston body comprises a piston shaft, an input shaft and a piston cylinder body. The piston shaft comprises a hollow spindle with two ends connected to a first piston and a second piston through connection bearings respectively. The first piston and the second piston are connected through an inner sleeve. The spindle is connected to a rotary connection member. The input shaft stretches into the inner sleeve and is matched and connected with the rotary connection member. The gas diverter comprises a first gas diversion port and a second diversion port. The pneumatic vibration device is compact in structure and high in adaptability, and can realize rotation and vibration of drilling tools.

Abstract: Disclosed are a method and device for realizing advanced nitrogen removal of mature landfill leachate and sludge reduction by using sludge fermentation products as carbon source, belonging to the field of biological treatment of sludge of high ammonia nitrogen wastewater.

Abstract: A root canal therapy device with a mechanical vibration mode and a rotation drive mode includes a head, a handle, a first flexible drive shaft and a second flexible drive shaft. The head includes an outer main part, a mandrel part for mounting a root canal file, a first drive input shaft part and a second drive input shaft part. The mandrel part is mounted in the outer main part. A first drive motor and a second drive motor are disposed on the handle. The invention has the following beneficial effects: the root canal file can rotate and vibrate during root canal preparation, so that the wall of a root canal is efficiently cut by the file; and the file can also vibrate, so that cutting resistance and cutting temperature are effectively reduced, a smear layer is avoided, and the quality and efficiency of root canal preparation are improved.

Abstract: Disclosed are a detection collimation unit, a detection apparatus and a SPECT imaging system. The detection collimation unit includes: a scintillation crystal array configured to receive a gamma photon emitted by a radioactive source in a detected object; and a number of photoelectric devices configured to receive the gamma photon and converting the gamma photon into a digital signal. The scintillation crystal array includes a number of scintillation crystals. The number of scintillation crystals are arranged substantially in parallel and are spaced from each other. Each scintillation crystal has a side face configured to receive a ray emitted by the radioactive source and an end face. The number of photoelectric devices are coupled to the end faces of the number of scintillation crystals.

Abstract: An electronic device includes a circuit structure, an electronic component electrically connected to the circuit structure, an antenna unit disposed on the circuit structure, and a shielding layer surrounding the electronic component. The circuit structure has a first surface and a second surface opposite to the first surface. The first surface has a first portion, a second portion, and a third portion, wherein the third portion connects the first portion and the second portion. In the normal direction of the electronic device, the third portion is closer to the second surface than the first portion or the second portion, thereby forming a recess. The electronic component is disposed in the recess. The antenna unit is disposed on the first surface of the circuit structure and is electrically connected to the electronic component through the circuit structure.