Abstract: The cryogenic liquid medium provided by the present invention includes at least one of an alkane composition, an olefin composition, an alcohol composition and an ether composition, and each of the alkane composition, the olefin composition, the alcohol combination and the ether composition includes a corresponding non-toxic and harmless substance having a melting point lower than ?110° C. and a standard boiling point higher than 50° C. Since the cryogenic liquid medium is formed by the non-toxic and harmless single substance having the melting point lower than ?110° C. and the standard boiling point higher than 50° C. or a binary, ternary and multi-component mixture thereof, the cryogenic liquid medium has a lower atmospheric boiling point, and is difficult to volatilize. The eutectic crystal of the specific mixture can be used to achieve the liquid requirements of low temperature, especially the temperature below ?110° C.

Abstract: Disclosed is a novel water-soluble natural polysaccharide antibacterial material. The molecules of the novel water-soluble natural polysaccharide antibacterial material not only contain guanidyl, but also contain amino acid groups, so that the biosafety of material is taken into consideration while the antibacterial performance of chitosan is improved, and the novel water-soluble natural polysaccharide antibacterial material has a low cytotoxicity and is a green antibacterial product.

Abstract: A compound ammonium fluoroborate, a nonlinear optical crystal of ammonium fluoroborate, and a preparation method and use thereof; the compound has the chemical formula of NH4B4O6F with a molecular weight of 176.28, and is prepared by a solid phase reaction process; the crystal has the chemical formula of NH4B4O6F with a molecular weight of 176.28, belongs to the orthorhombic system, and has a space group of Pna21 and the following unit cell parameters: a=7.615(3) ?, b=11.207(4) ?, c=6.604(3) ?, Z=4, V=563.6 ?3. The nonlinear optical crystal can be obtained by the method of the present invention. The present invention provides uses of the nonlinear optical crystal in producing harmonic light and a deep-ultraviolet frequency-multiplied light below 200 nm; and in making a frequency multiplication generator, a frequency up or down converter or an optical parametric oscillator.

Abstract: A compound ammonium fluoroborate, a nonlinear optical crystal of ammonium fluoroborate, and a preparation method and use thereof; the compound has the chemical formula of NH4B4O6F with a molecular weight of 176.28, and is prepared by a solid phase reaction process; the crystal has the chemical formula of NH4B4O6F with a molecular weight of 176.28, belongs to the orthorhombic system, and has a space group of Pna21 and the following unit cell parameters: a=7.615(3) ?, b=11.207(4) ?, c=6.604(3) ?, Z=4, V=563.6 ?3. The nonlinear optical crystal can be obtained by the method of the present invention. The present invention provides uses of the nonlinear optical crystal in producing harmonic light and a deep-ultraviolet frequency-multiplied light below 200 nm; and in making a frequency multiplication generator, a frequency up or down converter or an optical parametric oscillator.

Abstract: An oxychloride infrared nonlinear optical crystal and the preparation method and use thereof, the optical crystal has a general chemical formula of Pb2+xOCl2+2x, therein 0<x<0.139 or 0.141<x<0.159 or 0.161<x?0.6. The crystal is non-centrosymmetric, belongs to orthonormal system with space group of Fmm2, cell parameter is a=35.4963(14)±0.05 ?, b=5.8320(2)±0.05 ?, c=16.0912(6)±0.05 ?. The crystal is prepared by high temperature melt method or flux method. The crystal has a strong second harmonic generation efficiency of 4 times that of KDP (KH2PO4) tested by Kurtz method, it is phase machable, transparent in the range of 0.34-7 ?m. The laser damage threshold is 10 times that of the current commercial infrared nonlinear optical crystal AgGaS2. No crystalline water exists in lead oxychloride, and it is stable in the air and has good thermal stability.

Abstract: The invention relates to a lithium metaborate crystal and a preparation method and use thereof. The crystal has a chemical formula of LiBO2, a molecular weight of 49.75, and is a member of the monoclinic crystal system. The crystal has a P21/c space group and lattice constants of a=5.85(8) ?, b=4.35(7) ?, c=6.46(6) ?, ?=115(5)°, and Z=4. The crystal can be applied in wavelengths of infrared-visible-deep ultraviolet, and is grown by utilizing a melt crystallization method or a flux method. The crystal obtained using the method described in the invention is easily grown and processed, and can be used in the manufacture of a polarizing beam splitting prism such as a Glan prism, a Wollaston prism, a Rochon prism or a beam-splitting polarizer, and other optical components, enabling crucial applications in the fields of optics and communication.

Abstract: A nonlinear optical crystal of cesium fluorooxoborate, and a method of preparation and use thereof. The crystal has a chemical formula of CsB4O6F and a molecular weight of 291.15. It belongs to an orthorhombic crystal system, with a space group of Pna21, crystal cell parameters of a=7.9241 ?, b=11.3996 ?, c=6.6638 ?, and ?=?=?=90°, and a unit cell volume of 601.95 ?3. A melt method, high temperature solution method, vacuum encapsulation method, hydrothermal method or room temperature solution method is used to grow the crystal of CsB4O6F.

Abstract: A preparation method and application of a Na3Ba2(B3O6)2F birefringent crystal, the crystal having a chemical formula of Na3Ba2(B3O6)2F, and belonging to a hexagonal crystal system, the space group being P63/m, and the lattice parameters comprising a=7.3490(6) ?, c=12.6340(2) ?, V=590.93(12) ?3, Z=2; the crystal is used for an infrared/deep ultraviolet waveband, and is an uniaxial negative crystal, ne<no, the transmission range being 175-3,350 nm, the birefringence of 0.090 (3,350 nm)-0.240 (175 nm), and the crystal being grown by employing a melting method or a flux method; the crystal prepared via the method has a short growth cycle, high crystal quality and large crystal size, is easy to grow, cut, polish and store, is stable in the air, and difficult to deliquesce, and can be used for preparation of various polarization beam polarization beam splitter prism and infrared/deep ultraviolet waveband optical communication elements.

Abstract: The invention relates to a lithium metaborate crystal and a preparation method and use thereof. The crystal has a chemical formula of LiBO2, a molecular weight of 49.75, and is a member of the monoclinic crystal system. The crystal has a P21/c space group and lattice constants of a=5.85(8) ?, b=4.35(7) ?, c=6.46(6) ?, ?=115(5) I°, and Z=4. The crystal can be applied in wavelengths of infrared-visible-deep ultraviolet, and is grown by utilizing a melt crystallization method or a flux method. The crystal obtained using the method described in the invention is easily grown and processed, and can be used in the manufacture of a polarizing beam splitting prism such as a Glan prism, a Wollaston prism, a Rochon prism or a beam-splitting polarizer, and other optical components, enabling crucial applications in the fields of optics and communication.

Abstract: A method of preparing collagen active peptides with antiproliferative activity against cancer cells. The collagen active peptides are obtained by hydrolysis of papain and trypsin and a specific purifying process. The collagen active peptides have antiproliferative activity against cancer cells, such as ovarian carcinoma cells including SKOV3, OVCAR3, 436 and SRO82 and the prostate cancer cells including PC3, LnCAPC1, and LnCAPC2.

Abstract: A maskless photolithoghrapic system includes a laser point-by-point scanning exposure unit, a plane-projection exposure unit, a mobile station and a calculation control unit that decomposes a pattern to be exposed, so that a pattern portion with a precision requirement below a pre-determined threshold is exposed by the laser point-by-point scanning exposure unit, and a pattern portion with a precision requirement greater than the pre-determined threshold is exposed by the plane-projection exposure unit; when conducting laser point-by-point scanning exposure on a sample on the mobile station, the light emitted by the laser point-by-point scanning exposure unit moves relative to the sample according to the pattern portion with a precision requirement below the pre-determined threshold; and when conducting plane-projection exposure on the sample, the plane-projection exposure unit emits light with a corresponding pattern shape onto the sample according to the graph with a precision requirement greater than the p

Abstract: A compound of cesium fluorooxoborate, a nonlinear optical crystal of cesium fluorooxoborate, and a method of preparation and use thereof. The compound has a chemical formula of CsB4O6F and a molecular weight of 291.15. It has a crystal structure, which is prepared by a solid-state synthesis method or a vacuum encapsulation method. The crystal has a chemical formula of CsB4O6F and a molecular weight of 291.15. It belongs to an orthorhombic crystal system, with a space group of Pna21, crystal cell parameters of a=7.9241 ?, b=11.3996 ?, c=6.6638 ?, and ?=?=?=90°, and a unit cell volume of 601.95 ?3. A melt method, high temperature solution method, vacuum encapsulation method, hydrothermal method or room temperature solution method is used to grow the crystal of CsB4O6F.

Abstract: An oxychloride infrared nonlinear optical crystal and the preparation method and use thereof, the optical crystal has a general chemical formula of Pb2+xOCl2+2x, therein 0<x<0.139 or 0.141<x<0.159 or 0.161<x?0.6. The crystal is non-centrosymmetric, belongs to orthonormal system with space group of Fmm2, cell parameter is a=35.4963(14)±0.05 ?, b=5.8320(2)±0.05 ?, c=16.0912(6)±0.05 ?. The crystal is prepared by high temperature melt method or flux method. The crystal has a strong second harmonic generation efficiency of 4 times that of KDP (KH2PO4) tested by Kurtz method, it is phase machable, transparent in the range of 0.34-7 ?m. The laser damage threshold is 10 times that of the current commercial infrared nonlinear optical crystal AgGaS2. No crystalline water exists in lead oxychloride, and it is stable in the air and has good thermal stability.

Abstract: A potassium fluoroboratoberyllate crystal oblique-incidence laser frequency multiplier, comprising: a flake-like potassium fluoroboratoberyllate crystal having parallel front and back polished surfaces; a front antireflection film and a back antireflection film; a columnar crystal support provided with a square holding slot and a light through-hole; and external heating jackets; the crystal is disposed in the square holding slot, the front and back surfaces of the crystal conforming to a main surface of the square holding slot, a normal of the main surface of the holding slot forming an angle ? with the central axis of the crystal support; a laser at a fundamental frequency passes through the front antireflection film, and a frequency-multiplied laser generated in the crystal is transmitted out through the back antireflection film. The present invention has a simple structure and a low cost, and is suitable for medium- and high-power laser systems.

Abstract: A method for preparing stably dispersed cellulose nanofibers comprises the following steps: 1) mixing cellulose and an organic solvent, the percentage of the cellulose being 1% to 15% in weight; 2) adding an esterification agent into the resultant mixture of step 1), the molar ratio of the esterification agent to the cellulose being from 1:0.1 to 4; and 3) physically breaking the resultant mixture of step 2) until a suspension liquid with stably dispersed cellulose nanofibers of 2-1000 nm in diameter and 10-100 ?m in length is obtained, an esterification reaction of hydroxyl group(s) on the surface of cellulose fibers occurring at the time of the breaking. Also disclosed are dispersed cellulose nanofibers with improved compatibility to the matrix than the untreated cellulose and an improved strength of the composite materials.

Abstract: The present invention relates to a barium tetraborate compound and a barium tetraborate non-linear optical crystal, and a preparation method and use thereof, wherein the chemical formulae of the barium tetraborate compound and the non-linear optical crystal thereof are both BaB4O7, with a molecular weight of 292.58; the barium tetraborate non-linear optical crystal has a non-centrosymmetric structure, which belongs to a hexagonal system, and has a space group P65 and lattice parameters of a=6.7233(6) ?, c=18.776(4) ?, V=735.01(17) ?3, and Z=6, wherein the powder frequency-doubled effect thereof is two times that of KDP (KH2PO4), and the ultraviolet cut-off edge is lower than 170 nm.

Abstract: A potassium fluoroboratoberyllate crystal oblique-incidence laser frequency multiplier, comprising: a flake-like potassium fluoroboratoberyllate crystal having parallel front and back polished surfaces; a front antireflection film and a back antireflection film; a columnar crystal support provided with a square holding slot and a light through-hole; and external heating jackets; the crystal is disposed in the square holding slot, the front and back surfaces of the crystal conforming to a main surface of the square holding slot, a normal of the main surface of the holding slot forming an angle ? with the central axis of the crystal support; a laser at a fundamental frequency passes through the front antireflection film, and a frequency-multiplied laser generated in the crystal is transmitted out through the back antireflection film. The present invention has a simple structure and a low cost, and is suitable for medium-and high-power laser systems.

Abstract: A laser micro/nano processing system (100, 200, 300, 400) comprises: a laser light source used to provide a first laser beam having a first wavelength and a second laser beam having a second wavelength different from the first wavelength, with the pulse width of the first laser beam being in the range from a nanosecond to a femtosecond; an optical focusing assembly used to focus the first laser beam and the second laser beam to the same focal point; and a micro mobile platform (21) controlled by a computer. Also disclosed are a method for micro/nano-processing photosensitive materials with a laser and a method for fabricating a device with a micro/nano structure using laser two-photon direct writing technology. In the system and methods, spatial and temporal overlapping of two laser beams is utilized, so as to obtain a micro/nano structure with a processing resolution higher than that of a single laser beam, using an average power lower than that of a single laser beam.

Abstract: A preparation method and application of a Na3Ba2(B3O6)2F birefringent crystal, the crystal having a chemical formula of Na3Ba2(B3O6)2F, and belonging to a hexagonal crystal system, the space group being P63/m, and the lattice parameters comprising a=7.3490(6) ?, c=12.6340(2) ?, V=590.93(12) ?3, Z=2; the crystal is used for an infrared/deep ultraviolet waveband, and is an uniaxial negative crystal, ne<no, the transmission range being 175-3,350 nm, the birefringence of 0.090 (3,350 nm)-0.240 (175 nm), and the crystal being grown by employing a melting method or a flux method; the crystal prepared via the method has a short growth cycle, high crystal quality and large crystal size, is easy to grow, cut, polish and store, is stable in the air, and difficult to deliquesce, and can be used for preparation of various polarization beam polarization beam splitter prism and infrared/deep ultraviolet waveband optical communication elements.

Abstract: The present invention relates to a borate birefringent crystal applicable to ultraviolet (UV) or deep ultraviolet (DUV) range, with chemical formula of Ba2Mg(B3O6)2. The borate birefringent crystal belongs to a trigonal system, with space group of R-3 wherein a=0.70528(3) nm, c=1.65520(9) nm and Z=12. The barium magnesium borate birefringent crystal is negative uniaxial (ne<no) with a birefringence of 0.077-0.229 and a transmission range of 177-3000 nm. The crystal is easy to cut, grind, polish, and preserve, and is stable in air and is not easy to deliquesce. The barium magnesium borate birefringent crystal can be grown by the Czochralski method, flux method or the method of spontaneous crystallization from a melt, and has larger birefringence (no?ne=0.077-0.229). The crystal has important applications in the fields of optics and communications, e.g. for fabricating the polarizing beam splitter prism.