Abstract: A multifunctional nail polishing head includes a grinding head and a grinding handle, a plurality of first helical grooves are defined on a circumferential wall of the grinding head at intervals, the grinding head is provided with a rack between every two adjacent ones of the plurality of first helical grooves, in a radial section of the grinding head, a plurality of sets of large tooth segment are formed along a circumferential direction of the grinding head, each set of the plurality of sets of large tooth segment consists of a plurality of racks, an arrangement density of the plurality of racks in one set of the plurality of sets of large tooth segment is from sparse to dense, or from dense to sparse, or alternates dense and sparse along the circumferential direction of the grinding head.

Abstract: The present invention provides a method for multiproduct resin reuse (MRR) utilizing ionic exchange chromatography columns. The methods of the invention outline the cleaning steps necessary for reuse as well as the analytical processes used in determining product carryover from production of one product to the next. The invention outlines a successful MRR strategy that can be utilized not just in lab-scale studies, but in a GMP manufacturing setting.

Abstract: Provided is a treadmill capable of adjusting rising and falling by a folding block, including: a running platform; a running frame, configured to bear the running platform; and at least one adjusting mechanism, arranged below the running frame and including a supporting frame and a folding block. The supporting frame is connected to the running frame; the folding block includes a rotating connection part rotatably connected to the supporting frame, and a supporting part fixedly connected to the rotating connection part; and the adjusting mechanism adjusts a slope of the treadmill by the folding block rotatably connected to the supporting frame.

Abstract: Provided is a treadmill capable of adjusting slope rising and falling by a screw rod, including: a running platform; a running frame, configured to bear the running platform; a lifting frame, arranged below the running frame, configured to adjust the slope of the treadmill and including a side arm, one end of the side arm being pivoted to the running frame; and a driving mechanism, including a lead screw, the lead screw being in sleeving connection with a screw sleeve in a matching manner, and an outer side of the screw sleeve being rotatably connected to a supporting arm. The driving mechanism is arranged between the running frame and the lifting frame; the screw sleeve is driven by rotating the lead screw, so that the screw sleeve reciprocates on the lead screw; and the lifting frame is driven by the supporting arm to adjust the slope of the treadmill.

Abstract: A treadmill, including a running platform, which includes a driving piece, a supporting piece and a border; the border is movably connected to the driving piece; the supporting piece is movably connected to the driving piece and is movably connected to the border; and the driving piece optionally drives the supporting piece to move to drive the border to move. In this way, a shorter translation stroke of the driving piece is converted into a longer rotating stroke of one end of the supporting piece through the supporting piece. Therefore, a stroke of the driving piece driving the running platform to move up and down can be enlarged, so that in a case that a longer stroke is required for adjustment, in-place adjustment can be achieved within a short time, and the requirement of rapid adjustment by a user can be met while energy consumption, noise and cost are reduced.

Abstract: Embodiments of this application provide a voltage conversion circuit, a control method, a DC/DC converter and a device. The voltage conversion circuit includes a failure isolation module, a soft start module, and a voltage conversion module. The voltage conversion module includes an output filter capacitor. Both a first terminal of the failure isolation module and a first terminal of the soft start module are connected to a positive electrode of a first battery, both a second terminal of the failure isolation module and a second terminal of the soft start module are connected to a first terminal of the output filter capacitor, and a second terminal of the output filter capacitor is connected to a negative electrode of the first battery. The soft start module is configured to connect the first battery and the output filter capacitor, so that the first battery charges the output filter capacitor.

Abstract: An electronic device includes a camera assembly, a function assembly, and a controller. The camera assembly is configured to capture a first depth image of a first user and a second depth image of the first user. The controller is configured to determine a first spatial position between the first user and the camera assembly according to the first depth image, and control the function assembly to execute a first action according to the first spatial position. The controller further configured to determine a relative displacement between the first user and the camera assembly according to the first depth image and the second depth image, and control the function assembly to execute a second action according to the relative displacement. The second action is an action to adjust a result of the function assembly based on the first action. A method and a non-transitory storage medium are also provided.

Abstract: A folding mechanism for an armrest handle of a treadmill is provided, including: an armrest handle having left and right bottom ends that are configured to be connected to a treadmill; a rotational assembly, including: a connecting rod, a limiting member being provided on a left section of the connecting rod, and a diameter of the limiting member being greater than a diameter of the connecting rod; a rotation control plate, an arc-shaped sliding groove being disposed on the rotation control plate, one end of the sliding groove being provided with a limiting hole that is in communication with the sliding groove, a width of the sliding groove being greater than a width of the connecting rod and less than a width of the limiting member, and a diameter of the limiting hole being greater than the diameter of the limiting member.

Abstract: The invention relates to 3D printed parts made with thermoplastic polymers having a low stiffening temperature. 3D printed parts of the invention have very good Z layer adhesion, have a high elongation at break in the Z direction, preferably of more than 50 percent, and have at least an 80 percent ratio of Z to XY stress at yield or at break. The resulting part may be nearly isotropic—having similar mechanical properties in the XY and Z print directions. The excellent layer adhesion makes the resultant printed part more robust—able to withstand many cycles of use. Certain polymers of the invention produce printed parts that have a very low haze, and are nearly transparent.

Abstract: Foldable substrates have a first portion, a second portion, and a central portion positioned therebetween with a first transition region having a first central surface area of the central portion with a first average angle. In aspects, the first average angle is from about 176.10 to about 179.9° or from about 177.0° to about 179.9°. In aspects, a polymer angle is from 178.3° to about 179.9° or from about 179.10 to about 179.9°. Methods comprise disposing an etch mask over the first major surface of the foldable substrate before etching the foldable substrate. In aspects, the etch mask comprises a first polymer layer positioned between a first barrier layer and the first major surface. In aspects, the etch mask comprises a plurality of ink-jet printed shapes. Methods of measuring a contrast ratio comprise impinging a transparent apparatus with a collimated beam.

Abstract: The invention relates to an ink based on near-infrared light polymerization. The method and technology of direct writing three-dimensional printing belong to the field of material processing technology area. The method is: direct writing nozzles move in three-dimensional space or stationery, the ink is squeezed out of the direct writing nozzle, receiving the near-infrared light irradiation, after curing, complete the three-dimensional object forming and curing. The solidifying time t does not exceed the ratio of near-infrared light diameter dl and the ink extrusion speed vi, that is, t?dl/vi. Since near-infrared light has a better medium mass penetration, can penetrate the structure during molding to promote both internal and external to a higher degree of curing, so as to achieve cross-scale structure 3D printing, and the method provided by the present invention accurately controls solidifying process of the ink and therefore achieve the DIW array 3D structure real-time curing.

Abstract: The present application relates to a mini foldable treadmill, a lower end of the strut is rotatably connected to one end of a running plate; a part of the swivel arm near the middle of the swivel arm is hinged to the strut by an second rotation axis, a connector is disposed at the lower end of the swivel arm, which is connected to the upper end of the transmission portion, the lower end of the transmission portion is connected to the upper end of the spring pin, the spring pin is slidably mounted at the lower end of the strut, a fastener is disposed on the running plate, a pin hole is disposed thereon, and the spring pin is driven to extend so that the strut is in an upright state or driven to retract so that the strut is not in an upright state.

Abstract: A nanowire electrode array has a plurality of vertical nanowires extending from a substrate, each of the nanowires including a core of unitary first dielectric material that also covers the substrate and is unitary with the substrate. Each core has a sharp sub-100 nm diameter tip and a wider base, electrode leads on sidewalls to the tip of the nanowire, and second dielectric covering the electrode leads. The tips in the array can penetrate individual cells in cell culture, such as a mini-brain culture. The substrate can include a window for simultaneous optical imaging and electrophysiological recording.

Abstract: The invention relates to thermoplastic filament for use in 3-D printers, in which the core of the filament is non-solid or mono-filament. The filament may contain a multitude of small micro-voids, (a micro foam), be a foam-core structure, be hollow, or have a monofilament core. The filament of the invention is especially useful with crystalline and semi-crystalline polymers, and reduces the negative effect of filament voids, formed by shrinkage during the cooling of the filament.

Abstract: An optimal viewing angle adjustment method for a multi-dimensional spatial three-dimensional display screen, including steps of setting optimal angle parameter data between the multi-dimensional spatial three-dimensional display screen and a viewer at a front end of the multi-dimensional spatial three-dimensional display screen, disposing a detection device on the multi-dimensional spatial three-dimensional display screen for viewer identification and distance identification, identifying a distance between the viewer and the multi-dimensional spatial three-dimensional display screen by the detection device in real time, and transmitting a position and a direction of the viewer to the multi-dimensional spatial three-dimensional display screen, and controlling the multi-dimensional spatial three-dimensional display screen to zoom in or out according to the position and the direction of the viewer.

Abstract: A packaging structure is provided and may include a housing and a power component. The power component is disposed inside the housing. The housing may include a top cover and a bottom housing. The top cover may have a first heat transfer medium channel inside. The bottom housing may have a second heat transfer medium channel inside. The power component may include a first circuit board and a second circuit board. At least one first heating device may be disposed on the first circuit board. The first heating device may press against an inner wall of the top cover. At least one second heating device may be disposed on the second circuit board, and the second heating device may press against an inner wall of the bottom housing. When the foregoing structure is used, high power density and high heat dissipation efficiency can be achieved.

Abstract: The invention relates to the use of a compatible thermoplastic material (film, sheet, or raft) as the base sheet or layer for 3-D printing an article. The use of the base film provides a means of printing a large article, and of reducing warpage by printing directly on the film. The printed article adheres to the film better than to traditional printer surfaces (glass, metal, glue, or reusable films), because the printed article and film weld together by forming chain entanglements, due to being compatible, miscible, or semi-miscible in the melt.

Abstract: A method is described for preparing metal ink for additive manufacturing based on photo-thermal synergistic curing, relating to functional ink technology. The ink includes 50%-95% metal powder, 1%-35% photosensitive resin, 1%-35% photosensitive monomer, 0.1%-7% photoinitiator, 0.1%-5% thermal initiator, 0.1%-5% up-conversion material, and 0%-2% auxiliary agent. The method includes adding metal ink to the ink tank of a direct ink writing 3D printer, extruding the metal ink from the nozzle under computer control to the printing specific shapes on the platform, and curing under real-time illumination of a specific light source to obtain the green body. The method includes performing high-temperature debinding treatment on the obtained green body in a specific atmosphere. The treated green body is subjected to a high-temperature and high-pressure sintering treatment in a specific atmosphere and then cooled to room temperature.