Abstract: A method for providing an enhanced estimate of reference barometric pressure. The method uses multiple, dissimilar pressure references, such as in airport weather stations, personal weather stations, and wireless terminals such as smartphones, in order to provide the enhanced estimate of reference barometric pressure. The method generates an enhanced estimate of reference barometric pressure based on a first estimate of reference barometric pressure from a first pressure reference network made up of airport weather stations, for example. The method also uses a second estimate of reference barometric pressure from a second pressure reference network made of up personal weather stations, for example, and a third estimate of reference barometric pressure, also from the second network. The first, second, and third estimates of reference barometric pressure are combined such that both measurement accuracy and timeliness are improved in the resulting, enhanced estimate.

Abstract: Printable inks based on a 2D semiconductor, such as MoS2, and its applications in fully inkjet-printed optoelectronic devices are disclosed. Specifically, percolating films of MoS2 nanosheets with superlative electrical conductivity (10?2 s m?1) are achieved by tailoring the ink formulation and curing conditions. Based on an ethyl cellulose dispersant, the MoS2 nanosheet ink also offers exceptional viscosity tunability, colloidal stability, and printability on both rigid and flexible substrates. Two distinct classes of photodetectors are fabricated based on the substrate and post-print curing method. While thermal annealing of printed devices on rigid glass substrates leads to a fast photoresponse of 150 ?s, photonically annealed devices on flexible polyimide substrates possess high photoresponsivity exceeding 50 mA/W.

Abstract: A polyfluoroalkoxy resin and a method of preparing the same. The method includes: S1: charging deionized water, an organic solvent, a surfactant, and a chain transfer agent to a polymerization kettle; S2: after heating to a set temperature ranging from 50° C. to 80° C., charging an appropriate amount of polymerization monomer consisting of tetrafluoroethylene and perfluoroalkyl vinyl ether till reaching a set pressure ranging from 0.7 MPa to 1.5 MPa, followed by charging an initiator to start reaction; S3: adding additional polymerization monomer and perfluoroalkyl vinyl ether polymerization promoter, and maintaining the pressure in the polymerization kettle till end of reaction, whereby a polyfluoroalkoxy emulsion is obtained; S4: condensing, washing, and pelleting the polyfluoroalkoxy emulsion from step S3 to obtain the polyfluoroalkoxy resin.

Abstract: A method and a device of designing an optical system, and a storage medium are provided. The method includes: S1. determining an initial structure parameter of the optical system according to a design requirement; S2. optimizing the initial structure parameter according to the ray tracing method, and obtaining a theoretical structure parameter; S3. performing a discretization on a phase of a metalens of the theoretical structure parameter and obtaining a discrete phase; S4. performing an optical field propagation simulation according to the discrete phase, and obtaining an imaging performance index; S5. if the image performance index meets the design requirement, obtaining a target structure parameter; if the image performance index doesn't meet the design requirement, re-optimizing the image performance index and obtaining the target structure parameter.

Abstract: Provided is an athermal metalens, the metalens includes: a substrate and a plurality of nanostructures; the plurality of nanostructures are set on at least one side of the substrate, and are arranged in a periodicity; where a thermal refractive index coefficient of the plurality of nanostructures is less than a reference thermal refractive index coefficient; or each nanostructure is composed of at least two materials, and the product of the thermal refractive index coefficient of the at least two materials is less than 0. Thus, the effective refractive index of the nanostructures is insensitive to the temperature changes, and the reduced imaging performance of the metalens caused by temperature drift is improved.

Abstract: A synthetic method and catalyst for preparing 3-(3-oxo-2-pentyl)cyclopentyl dimethyl malonate are disclosed. The synthetic method uses 2-pentyl-2-cyclopentenone and dimethyl malonate as raw materials, and reacts them in the presence of a catalyst to prepare 3-(3-oxo-2-pentyl)cyclopentyl dimethyl malonate, the catalyst is a basic ionic liquid, the pH value of the basic ionic liquid is greater than or equal to 10, and the catalyst is prepared by a method comprising the steps of: mixing the nitrogen-containing heterocyclic compound with an aliphatic carboxylate or hydroxyl aliphatic carboxylate or fluorophosphate under stirring. The synthetic method is environmentally friendly, stable in reaction and low-cost, and the conversion of 2-pentyl-2-cyclopentenone is significantly improved due to the use of the above-mentioned basic ionic liquid as catalyst.

Abstract: A magnetic tunnel junction is disclosed wherein the reference layer and free layer each comprise one layer having a boron content from 25 to 50 atomic %, and an adjoining second layer with a boron content from 1 to 20 atomic %. One of the first and second layers in each of the free layer and reference layer contacts the tunnel barrier. Each boron containing layer has a thickness of 1 to 10 Angstroms and may include one or more B layers and one or more Co, Fe, CoFe, or CoFeB layers. As a result, migration of non-magnetic metals along crystalline boundaries to the tunnel barrier is prevented, and the MTJ has a low defect count of around 10 ppm while maintaining an acceptable TMR ratio following annealing to temperatures of about 400° C. The boron containing layers are selected from CoB, FeB, CoFeB and alloys thereof including CoFeNiB.

Abstract: A perpendicularly magnetized magnetic tunnel junction (p-MTJ) is disclosed wherein a boron containing free layer (FL) is subjected to a plasma treatment with inert gas, and a natural oxidation (NOX) process to form B2O3 before overlying layers are deposited. A metal layer such as Mg is deposited on the FL as a first step in forming a Hk enhancing layer that increases FL perpendicular magnetic anisotropy, or as a first step in forming a tunnel barrier layer on the FL. One or more anneal steps are essential in assisting B2O3 segregation from the free layer and thereby increasing the FL magnetic moment. A post-oxidation plasma treatment may also be used to partially remove B2O3 proximate to the FL top surface before the metal layer is deposited. Both plasma treatments use low power (<50 Watts) to remove a maximum of 2 Angstroms FL thickness.

Abstract: A method of forming a MTJ with a tunnel barrier having a high tunneling magnetoresistance ratio, and low resistance×area value is disclosed. The method preserves perpendicular magnetic anisotropy in bottom and top magnetic layers that adjoin bottom and top surfaces of the tunnel barrier. A key feature is a passive oxidation step of a first Mg layer that is deposited on the bottom magnetic layer wherein a maximum oxygen pressure is 10-5 torr. A bottom portion of the first Mg layer remains unoxidized thereby protecting the bottom magnetic layer from substantial oxidation during subsequent oxidation and anneal processes that are employed to complete the fabrication of the tunnel barrier and MTJ. An uppermost Mg layer may be formed as the top layer in the tunnel barrier stack before a top magnetic layer is deposited.

Abstract: A perpendicularly magnetized magnetic tunnel junction (p-MTJ) is disclosed wherein a boron containing free layer (FL) is subjected to a plasma treatment with inert gas, and a natural oxidation (NOX) process to form B2O3 before overlying layers are deposited. A metal layer such as Mg is deposited on the FL as a first step in forming a Hk enhancing layer that increases FL perpendicular magnetic anisotropy, or as a first step in forming a tunnel barrier layer on the FL. One or more anneal steps are essential in assisting B2O3 segregation from the free layer and thereby increasing the FL magnetic moment. A post-oxidation plasma treatment may also be used to partially remove B2O3 proximate to the FL top surface before the metal layer is deposited. Both plasma treatments use low power (<50 Watts) to remove a maximum of 2 Angstroms FL thickness.

Abstract: Printable inks based on a 2D semiconductor, such as MoS2, and its applications in fully inkjet-printed optoelectronic devices are disclosed. Specifically, percolating films of MoS2 nanosheets with superlative electrical conductivity (10?2 s m?1) are achieved by tailoring the ink formulation and curing conditions. Based on an ethyl cellulose dispersant, the MoS2 nanosheet ink also offers exceptional viscosity tunability, colloidal stability, and printability on both rigid and flexible substrates. Two distinct classes of photodetectors are fabricated based on the substrate and post-print curing method. While thermal annealing of printed devices on rigid glass substrates leads to a fast photoresponse of 150 ?s, photonically annealed devices on flexible polyimide substrates possess high photoresponsivity exceeding 50 mA/W.

Abstract: A point cloud projection system provided by the present disclosure includes: a laser source array and a metalens array. The laser source array and the metalens array are set on the same optical axis. The laser source array is located at the focal plane in the object space of the metalens array. The metalens array have a positive focal length in a working waveband of the laser source array.

Abstract: An endoscopic probe is provided, and the endoscopic probe includes: an optic fiber and a metalens. The optic fiber includes: a signal input fiber core, a signal output fiber core and a coating; the signal input fiber core is used to transport an input laser signal. The metalens includes: a translucent substrate, a plurality of nanostructures arranged on the one side of the surface of the substrate. The plurality of nanostructures are arranged in array and attached to a distal surface of the signal input fiber core, so as to focus the input laser signal on an inner surface of tissues to be detected; and the signal output fiber core is used for transporting a laser signal reflected through the inner surface of the tissue to be detected, so as to obtain an image of the inner surface of the tissue to be detected after the reflected laser signal processing.

Abstract: Provided is a metalens array and a wavefront sensor system, and the metalens array includes: at least a metalens array unit; and the metalens array unit includes: a transmittive metalens array, the transmittive metalens array includes: a plurality of transmittive metalens at different working waveband, and the plurality of transmittive metalens have the same focal length and can be used for focusing incident lights of different wavelengths to different positions of a first plane. According to the present disclosure, a plurality of transmittive metalens with different working wavelengths may focus the light of different wavelengths at different positions in the focal plane and obtain the focal point offset of different wavelengths, so as to calculate wavefront of multiple wavelengths.

Abstract: Disclosed herein are processes for preparing 8-(3-(4-acryloylpiperazin-1-yl)propyl)-6-(2,6-dichloro-3,5-dimethoxyphenyl)-2-(methylamino)pyrido[2,3-d]pyrimidin-7(8H)-one and FGFR inhibitor, as well as polymorphs and/or salt forms thereof.

Abstract: A unit cell, a phase-tunable metasurface and an optical system are provided by this disclosure. The unit cell includes: an electrode layer, an electrical actuating layer and a nanostructure; the nanostructure is a sub-wavelength structure; the electrode layers are setting on the both sides of the electrical actuating layer; the nanostructure is setting on the one side of the electrode layer away from the electrical actuating layer, the electrical actuating layer can move in the height axial direction of the nanostructure under the action of the electric field provided by the electrode layer.

Abstract: A method of designing a metasurface, a beam shaper, a device and electronic equipment are provided. The method of designing the metasurface includes: determining a type of an incident beam and parameters of the incident beam; determining a type of an outgoing beam and a parameter of the outgoing beam; based on the parameters of the incident beam and the parameter of the outgoing beam, determining an initial value of a diffraction phase distribution; the diffraction phase distribution represents a phase distribution configured to modulate the incident beam to the outgoing beam; based on the type of the incident beam and the type of the outgoing beam, iteratively optimizing the diffraction phase distribution to obtain an optimized diffraction phase distribution; generating a target phase distribution according to the optimized diffraction phase distribution; and generating the metasurface according to the target phase distribution.

Abstract: According to a song recommendation method and apparatus, an electronic device, a storage medium, a computer program product and a computer program provided in embodiments of the present disclosure, a first page can be displayed firstly, and the first page includes a target song selected according to a song release date; then, in response to a trigger operation performed for the target song on the first page, the first page is switched to a second page of the selected target song. The song release date of the target song in the present embodiment is determined according to release information and auditory perception information of a song, and in this way, a real song release date of a song can be effectively identified, which in turn enables the target song shown on the first page to be selected based on the real song release date thereof.

Abstract: A fan, comprising blades (102), an upper hub (111), and a lower hub (112). Each blade (102) comprises a connecting part (211). The connecting part (211) is clamped between a lower surface of the upper hub (111) and an upper surface of the lower hub (112). The lower surface of the upper hub (111) is provided with an upper hub connecting area, and the upper surface of the lower hub (112) is provided with a lower hub connecting area. An upper surface and a lower surface of the connecting part (211) are separately provided with a junction surface extending from the connecting part (211). The lower surface of the upper hub (111) and the upper surface of the lower hub (112) are separately provided with a matching surface matching the junction surface.

Abstract: Provided is a method, device and electronic device of designing an anti-reflection film of a metalens, the method including: step S1: selecting a filler material; step S2: calculating an effective refractive index and an equivalent extinction coefficient of respective filled unit cells; step S3: obtaining a refractive index and an extinction coefficient of the filled metalens by calculating a weighted average of the effective refractive index and the equivalent extinction coefficient of the respective filled unit cells; step S4: calculating a parameter of an initial anti-reflection film based on the refractive index and the extinction coefficient of the filled metalens; step S5: optimizing the parameter of the initial anti-reflection film to obtain an optimized parameter of the anti-reflection film.