Abstract: A laser fusion welding device includes a 1.9 ?m laser light source, a control unit and a light spot adjusting device. The control unit is configured to control the laser light source and the light spot adjusting device to adjust a laser power density at an object to be subjected to fusion welding. The 1.9 ?m laser light source has output power of 100-500 W. The control unit includes a time control unit, a power control unit and a light spot control unit. The time control unit is configured to control a turn-on time of the laser light source. The power control unit is configured to control the output power of the laser light source. The light spot control unit is configured to control the light spot adjusting device to adjust a size of a light spot at the object to be subjected to fusion welding.

Abstract: Disclosed in the present invention is a nonlinear optical crystal. The chemical formula of the nonlinear optical crystal is MHgGeSe4, M being selected from Ba or Sr. The nonlinear optical crystal has no symmetrical center, belongs to an orthorhombic crystal system, and has a space group Ama2. The nonlinear optical crystal is an infrared nonlinear optical crystal, and has the advantages of great nonlinear optical effect, wide light transmitting band, high hardness, good mechanical properties, breakage resistance, deliquescence resistance, easiness in processing and preserving, etc. Also disclosed in the present invention are a method for preparing the nonlinear optical crystal and application thereof.

Abstract: The present disclosure relates to a magnon spin valve device, a magnon sensor, a magnon field effect transistor, a magnon tunnel junction and a magnon memory. A magnon spin valve device may comprise a first ferromagnetic insulation layer, a non-magnetic conductive layer disposed on the first ferromagnetic insulation layer, and a second ferromagnetic insulation layer disposed on the non-magnetic conductive layer.

Abstract: One aspect of the present invention relates to a recovery method of 226Ra, and the recovery method of 226Ra includes a step (A1) of immersing a solid-state 226Ra containing substance and a carrier having a function of adsorbing 226Ra ions in a processing solution, and then irradiating the processing solution with ultrasonic waves.

Abstract: A calcium metaborate birefringent crystal and a preparation method and use thereof, the crystal having a chemical formula of CaB2O4 and a molecular weight of 125.70, and belonging to the orthorhombic crystal system and space group Pbcn with unit-cell parameters a=11.60(4)?, b=4.28(8)?, c=6.21(6)?, and Z=4, wherein the calcium metaborate birefringent crystal is a negative biaxial crystal with a transmission range of 165-3400 nm and a birefringence between 0.09-0.36; the crystal is applicable to infrared-visible-ultraviolet-deep ultraviolet bands, and is grown by a melt method, a flux method, a Bridgman method or a heat exchange method; the crystal obtained by the method of the present invention is easy to grow and easy to process; and can be used for making polarizing beam-splitting prisms.

Abstract: A method for measuring concentrations of multiple gases by using an infrared band laser light includes: pumping Ho crystal by using a 1.9 ?m single thulium-doped solid-state laser to obtain a 2 ?m band near-infrared laser output; controlling a light-emitting angle of 2 ?m band laser light; allowing the 2 ?m laser light to enter a first measurement cell at a first emergent angle, and measuring a concentration of methane gas in the first measurement cell; generating and introducing the 3-5 ?m mid-infrared laser light into a second measurement cell to measure concentrations of ammonia gas and carbon monoxide in the second measurement cell; generating and introducing the 6-12 ?m far-infrared laser light into a third measurement cell to measure concentrations of carbon dioxide, acetylene, ethylene and ethane gas in the third measurement cell.

Abstract: A nonlinear optical crystal of guanidinium tetrafluoroborate has a chemical formula of [C(NH2)3]BF4 and a molecular weight of 146.89, belongs to the trigonal crystal system, has a space group of R3m; has lattice parameters of a=7.4634(10)?, b=7.4634(10)?, c=9.1216(19) (6)?, and Z=3; has an ultraviolet cutoff edge of 200 nm; and has a frequency-multiplication response that is 4-5 times that of the commercialized nonlinear optical crystal KDP. A hydrothermal method, a room-temperature solution method, an evaporation method or a solvothermal method is used to grow the crystal in a centimeter-scaled size. The crystal can produce frequency-doubling, frequency-tripling, frequency-quadrupling, frequency-quintupling or frequency-sextupling harmonic light output from the fundamental frequency light of 1064 nm generated by a Nd:YAG laser, and/or can produce ultraviolet and deep-ultraviolet frequency-multiplication light output below 200 nm.

Abstract: The present disclosure relates to a magnonic magnetoresistance (MMR) device and an electronic equipment including the same. According to one embodiment, a core structure of a MMR device may include: a first ferromagnetic insulating layer (Ferro-magnetic Insulator, FMI1); a two-dimensional conductive material layer (Spacer) set on the first ferromagnetic insulating layer; and a second ferromagnetic insulating layer (Ferro-magnetic Insulator, FMI2) set on the two-dimensional conductive material layer. The MMR device of the present disclosure may enhance interface effect in spin electron transmission and thus improve performance of the MMR device.

Abstract: An insoluble transdermal microneedle patch, includes microneedles and a backing. The microneedles include bases and needlepoints located on the base, and materials made for the microneedles include crosslinked sodium alginate. The backing is connected with the bases, and parts of the backing corresponding to the needlepoints are hollow portions. The microneedle patch can act in the skin for a long time, during it is used for transdermal delivery, drugs can enter skin micropores to be absorbed into a body through pores formed after swelled microneedles acting on the skin absorbs water, thereby increasing a bioavailability of the drugs during the transdermal delivery. After drug administration end, the microneedles are completely removed without increasing a metabolic burden in the body, soluble materials are prevented from being accumulated in the body, and the microneedles have good biological safety. A preparation method of the insoluble transdermal microneedle patch and application thereof are provided.

Abstract: A method for preparing high-purity granatin A: by means of a combination of low-temperature liquid phase chromatography and an isomerization conversion purification method, using pomegranate peel extract as a source material, granatin A of over 98% purity can be acquired, and can be used as a standard product for quality control of pomegranate peel, pomegranate flower, or other medicinal material with granatin A as the active ingredient.

Abstract: A method for measuring multiple parameters of mixed gases based on broadband infrared light source is provided, including: filtering a broadband infrared laser, and forming a laser beam including three narrow-linewidth wavelengths; dividing the laser beam into a first sub-laser beam and a second sub-laser beam; focusing and transmitting the first sub-laser beam to a gas sample cell; focusing and transmitting the first sub-laser beam to a first reflector; reflecting and transmitting the first sub-laser beam; reflecting and transmitting the second sub-laser beam to the second beam splitter; combing the first sub-laser beam transmitted by the second beam splitter and the second sub-laser beam reflected by the second beam splitter, measuring the multiple parameters; combining and transmitting the second sub-laser beam transmitted by the second beam splitter and the first sub-laser beam reflected by the second beam splitter to a spectrometer for measuring concentrations the mixed gases.

Abstract: A fiber optic sensing head includes a single-mode optical fiber, a twin hole optical fiber including a cladding region and a core region surrounded by the cladding region, and the core region includes a second core located at an axis center, as well as a first and second round holes symmetrically distributed with respect to the second core; an incoming end of a gradient refractive-index fiber is connected to an outgoing end of the twin hole optical fiber with the incoming end of the gradient index fiber aligned with the outgoing end of the single-mode optical fiber at center. A thermal-sensitive structure is filled in a preset length part of the second round hole extending along an axial direction of the twin hole optical fiber. An incoming end of the twin hole optical fiber is connected to an outgoing end of the gradient index optical fiber with displacement.

Abstract: The present invention provides a patterned silicon substrate-silicon germanium thin film composite structure comprising a silicon substrate having a patterned structure, a silicon germanium buffer layer positioned on the silicon substrate, a silicon germanium/silicon superlattice layer positioned on the silicon germanium buffer layer and a silicon germanium thin film layer positioned on the silicon germanium/silicon superlattice layer, wherein the silicon germanium/silicon superlattice layer comprises silicon germanium layers and silicon layers which are grown alternately. The present invention also provides a preparation method of the patterned silicon substrate-silicon germanium thin film composite structure of the present invention. The present invention also provides an application of the patterned silicon substrate-silicon germanium thin film composite structure of the present invention in strained silicon devices.

Abstract: A method for preparing perovskite nanopowder through a rheological phase reaction at low-temperature that can include: taking hydroxide and metallorganic compound as initial reactants; mixing and stirring the reaction raw materials to form a solid-liquid rheological phase mixture; and controlling the reaction temperature and period, under a low-temperature condition, to prepare perovskite nanopowder in nearly spherical shape and a size of 20-100 nm. This allows for advantages such as controllable product size, low cost, high yield per unit volume, environmental friendliness, high yield per unit volume, and high repeatability. The perovskite nanopowder obtained by this way is nearly spherical, are uniform in size distribution and have controllable granularity. This can be used as the ceramic substrate for electronic components such as high-end chip capacitors and PTC thermistors, etc., as well as the raw material for manufacturing ceramic 3D printing additives and electronic ceramic ink.

Abstract: A method of preparing a recombinant adeno-associated virus (rAAV) including: (1) preparing a shuttle plasmid and a corresponding recombinant bacmid including a baculovirus genome, where the shuttle plasmid includes at least an rAAV gene of interest flanked by inverted terminal repeats (ITR-GOI) integrated with a heterologous functional gene fragment, and the recombinant bacmid includes an expression cassette of functional protein components necessary for assembly of the rAAV; (2) integrating the rAAV ITR-GOI and the expression cassette of functional protein components by using the shuttle plasmid and the recombinant bacmid, to yield a recombinant bacmid including a recombinant baculovirus genome; and (3) transfecting, with the recombinant bacmid, a host cell line.

Abstract: The present disclosure relates to a spin wave switch and a filter based on a magnonic crystal. According to one embodiment, a magnonic crystal device may include a ferromagnetic layer and an antiferromagnetic planar periodic structure set on the ferromagnetic layer. The magnonic crystal device of the present disclosure may be used as a spin wave switch to effectively regulate and control the transmission coefficient of the spin wave, or may be used as a spin wave filter to filter the spin wave of a specific frequency.

Abstract: Embodiments of the present disclosure are a pitch-based negative electrode material for a sodium-ion battery and related methods and applications. The method comprises: placing a pitch recursor into a muffle furnace to allow the pitch precursor to experience pre-oxidation for 2 to 6 hours at a temperature ranging from 200° C. to 350° C., to obtain pre-oxidized pitch; placing the pre-oxidized pitch into a high-temperature carbonization furnace, and increasing the temperature to 1300° C. to 1600° C. at a temperature increase speed of 0.5° C./min to 5° C./min, and carrying out thermal treatment on the pre-oxidized pitch in an inert atmosphere for 1 to 10 hours, to allow the pre-oxidized pitch to experience carbonization reactions, oxygen in the pre-oxidized pitch being used for breaking an ordered structure of the pitch during the carbonization of the pre-oxidized pitch, so as to form a wedge-shaped voids disordered structure.

Abstract: Provided is a prelithiation material, comprising a lithium-containing compound and an inorganic non-metallic reductive agent. Further provided is a method for preparing the prelithiation material of the present invention. Further provided is use of the prelithiation material of the present invention in a lithium ion battery. By mixing the prelithiation material provided by the present invention with a positive electrode material or coating the side of a separator near the positive electrode with the same, a battery is assembled, and during first cycle, active lithium can be released so as to compensate active lithium lost from a negative electrode. The prelithiation material provided by the present invention has a good compatibility with currently commercially available positive and negative electrodes, and is very suitable for current secondary lithium ion batteries.

Abstract: A compound strontium fluoroborate, nonlinear optical crystal of strontium fluoroborate, preparation method thereof; the chemical formula of the compound is SrB5O7F3, its molecular weight is 310.67, and it is prepared by solid-state reaction; the chemical formula of the crystal is SrB5O7F3, its molecular weight is 310.67, the crystal is of the orthorhombic series, the space group is Ccm21, and the crystal cell parameters are=10.016(6) ?, b=8.654(6)(4) ?, c=8.103(5) ?, Z=4, and V=702.4(8) ?3. A SrB5O7F3 nonlinear optical crystal has uses in the preparation of a harmonic light output when doubling, tripling, quadrupling, quintupling, or sextupling the frequency of a 1064-nm fundamental-frequency light outputted by a Nd:YAG laser, or the generation of a deep-ultraviolet frequency doubling light output lower than 200 nm, or in the preparation of a frequency multiplier, upper or lower frequency converter, or an optical parametric oscillator.

Abstract: Methods and devices are described for performing an all-phase measurement of an ultra-fast laser pulse having a spectral range of greater than one octave. The ultra-fast laser pulse may be split into a first beam comprising a fundamental light with a wavelength ?0 and a second beam comprising a light with a wavelength 2?0. The light with the wavelength 2?0 may be frequency doubled to a light with a wavelength ?0 to generate an interference with the fundamental light. Fourier transform may be performed on an interference spectrum of the interference, and a relative envelope delay (RED) between the fundamental light and the frequency doubled light and a carrier envelope phase (CEP) may be acquired based on a result of the Fourier transform.