42results about How to "Reduced Diffusion Effects" patented technology

An optical element, includes: a diffractive functional layer which diffracts at least part of incident light; and a grid formed on a first surface of the diffractive functional layer, the grid including a plurality of fine wires and having a polarization separation function; wherein the optical element reflects a part of the incident light while transmitting another part of the incident light, the first surface of the diffractive functional layer including a plurality of first regions; a plurality of second regions, a height thereof relative to a second surface of the diffractive functional layer being different from that of the first regions, the second surface being an opposite surface to the first surface; and a step provided at a border between the first regions and the second regions.

The invention provides a Terahertz modulator based on a silicon-based microstructure on SOI, a manufacturing method and a modulation system. The Terahertz modulator successively comprises an Al2O3 substrate of a bottom layer, a SiO2 isolation layer, the silicon-based microstructures, and an Al2O3 passivation layer from bottom to top. The silicon-based microstructures are periodically arranged on the SiO2 isolation layer. Each silicon-based microstructure comprises a two-layer square Si-based step structure. The modulation system comprises a semiconductor laser, a laser modulator, the Terahertzmodulator, a Terahertz radiation source, and a Terahertz detector. In the invention, a reflectivity which is lower than 22% is achieved for a Terahertz wave of 0.4 THz to 0.85 THz and a minimum of 18% can be reached at 0.82 THz so that the reflectivity of a modulation device to the Terahertz wave can be significantly reduced and a utilization rate of the Terahertz wave is improved. A 64.5% modulation depth can be achieved under 808 nm laser radiation with 1200 mw power. Compared with a traditional silicon-based Terahertz modulator, a Terahertz imaging diffusion area can effectively increase aresolution and make the resolution reach above 21.9% in an imaging system.

The invention discloses a gas channel measurement parameter selecting method applied to engine gas channel analysis. The gas channel measurement parameter selecting method applied to engine gas channel analysis includes the steps that gas channel measurement parameters and health parameters are determined according to a working state of an engine; a first sensibility influence coefficient array H of the gas channel measurement parameters and the health parameters is obtained; a second influence coefficient array S is generated; sensibility of each health parameter corresponding to each gas channel measurement parameter is obtained; fuzzy nearness among all the gas channel measurement parameters is obtained, and a measurement parameter nearness array R is formed; an overall relative coefficient beta is calculated; multiple groups of class group data are formed; a health parameter nearness array E is formed; an overall redundancy coefficient psi is calculated; the optimal class group data are screened out; the steps are repeated to obtain the optimal class group data of the engine in all working states. By means of the method, a gas channel measurement parameter optimum selection scheme can be determined fast.

The invention discloses a plasma nitrogen treatment apparatus. The plasma nitrogen treatment apparatus comprises a vacuum treatment cavity for supporting a pedestal of a substrate with a silicon dioxide film, a gas supply mechanism for supplying a nitrogen-containing gas to the vacuum treatment cavity, a plasma generating mechanism for ionizing the nitrogen-containing gas to nitrogen plasma, and a cooling mechanism for cooling the pedestal to -100 DEG C to 0 DEG C before injecting the nitrogen plasma in the silicon dioxide film. The invention also provides a gate medium layer preparation device with the plasma nitrogen treatment apparatus, and a corresponding gate medium layer preparation method. According to the invention, the reliability of a gate medium layer can be effectively improved.

The invention discloses a UWB (Ultra Wide Band) gap tunnel junction used for connecting with a broad-band gap sub-battery in a multijunction solar battery. The UWB gap tunnel junction comprises an n-type Alx-Ga-InP layer and a p-type Aly-Ga-As layer which are sequentially arranged in parallel, wherein x is not less than 0.01 and is not more than 0.5, and y is not less than 0.1 and is not more than 0.9; an n-type dopant is Te of which the doping concentration is 5*10<18>-5*10<19>cm<-3>; the P-type dopant is C of which the doping concentration is 5*10<18>-5*10<20>cm<-3>; and the thickness ranges of the n-type Alx-Ga-InP layer and the p-type Aly-Ga-As layer are 10-100nm. The UWB gap tunnel junction provided by the invention is combined by a UWB gap material, so that good electrical contact between a top battery in a UWB solar battery and a sub-battery below the UWB solar battery can be formed, and the difficult problem that a current density tunnel junction with high peak is difficultly prepared can be solved.

Illuminated inner trim for vehicles comprising a substrate, a decorative lining, and integrated between these a set of LEDs that can provide a decorative illumination such that when on they are visible through the decorative lining as well-defined points of light, while when off they are unseen. Specifically, when said LEDs are on and the vehicle occupants change their angle of vision with respect to the LEDs, a set of points of light will be seen with variable intensity due to the contrast between areas of direct light and areas of shade, causing a sparkling effect.

An embodiment of the invention relates to an environment-friendly waterborne block copolymer dispersant and a preparation method thereof. The environment-friendly waterborne block copolymer dispersantis made from, by mass, 20-30% of a polymerization monomer, 5-10% of cyclic alkyl sultone, 5-10% of a long-chain alkyl monomer, 1-3% of polysiloxane, 1-3% of an initiator, 0.5-1% of an activator, 2-5%of a chain transfer agent, 1-3% of waterborne RAFT (reversible addition-fragmentation chain transfer polymerization) agent, 1-2% of a neutralizer, and 45-55% of deionized water. The environment-friendly waterborne block copolymer dispersant provided by an embodiment of the invention has the special structure block copolymer and allows characteristics of different homopolymers to be integrated, amorphism and elasticity of flexible block and crystallinity and rigidity of rigid block help pigment-filler and mineral powdery particles to dispersedly suspend in the solutions, such as a paint base,for long time, macroscopic separation can be prevented, secondary flocculation is avoided, and a prepared colored paint system has good storage stability and brighter color that lasts for long time.

The invention relates to a purification method of semaglutide. The method comprises the following steps that 1) cracking resin prepared through a solid-phase synthesis method and semaglutide crude peptide from which a protecting group is removed are obtained, and the semaglutide crude peptide is dissolved by using a phosphate buffer solution containing an organic solvent; 2) a semaglutide crude peptide solution is filtered by using an organic filter membrane of 0.22 micro meter, and a filtrate is collected for later use; 3) in first-step purification, by taking a reversed-phase filler as a stationary phase, a phosphate buffer solution containing an organic solvent as a phase A and acetonitrile as a phase B, gradient elution is conducted; 4) in second-step purification, by taking a reversed-phase filler as a stationary phase, a dilute acetic acid solution as a phase A and acetonitrile as a phase B, gradient elution is conducted; and 5) freeze drying is conducted on a concentrated sampleto obtain the semaglutide. According to the method, the phosphate buffer solution containing the organic solvent is used for dissolving the crude peptide, and the pH value of the dissolved crude peptide solution is more stable and crude peptide is not prone to separate out, so that the blockage of a chromatographic column and equipment is avoided, and the separation effect is improved.

The invention relates to an air hydrostatic bearing of a machine making free piston type reciprocating motion. The air hydrostatic bearing comprises a piston, a cylinder, a discharger, a compressing cavity and an air storage groove, wherein a first orifice, a first annular shallow groove and a first pressure equalizing shallow groove are formed in the outer side of the outer circumference of the outer sleeve of the piston along the circumferential direction; the first pressure equalizing shallow groove is communicated with the first annular shallow groove at two sides of the first orifice; the first orifice is communicated with the first annular shallow groove through the first pressure equalizing shallow groove; double-row second orifices are formed in the outer side of the outer circumference of the inner sleeve of the piston along the circumferential direction; a second annular shallow groove and a second pressure equalizing shallow groove are formed in the inner side of the inner circumference; the second pressure equalizing shallow groove is communicated with the second annular shallow groove at two sides of the second orifices; and the second orifices are communicated with the second annular shallow groove through the second pressure equalizing shallow groove. The bearing capacity and air film rigidity of the air hydrostatic bearing are improved, the service life of the piston is prolonged, the air consumption is lowered and the efficiency of the machine making free piston type reciprocating motion is increased.

The embodiment of the invention provides an aqueous environmentally-friendly nano-copolymer multifunctional defoamer and a preparation method thereof. The raw materials of the defoamer comprise, by mass, 20-26% of a natural vegetable fatty alcohol, 10-15% of a higher fatty alcohol, 5-10% of an amide, 5-8% of a nano-hydrophobic agent, 0.5-1% of a fluorine monomer, 3-6% of a silane, 2-5% of an initiator, 1-2% of an active polymerization agent, 0.5-1% of a catalyst, 1-2% of a thickener, 1-2% of an antifreeze agent and 30-45% of deionized water. The defoamer provided by the embodiment of the invention is prepared by raw material selection and a copolymerization synthesis mode, a nano-material group is introduced to change the polymer structure, and harmful substances such as a conventional emulsifier, formaldehyde and silicone oil are not used, so the versatility, the weather resistance, the stain resistance, the high corrosion resistance and the auto-cleaning property are improved. The product can be decomposed by hydrolysis, photodegradation and biodegradation without causing cumulative effects, so the product is very safe to water sources and the environment.

The invention provides a method for semi-quantitative determination of ethyl carbamate through a thin layer chromatography. According to the method, mixed liquor of cinnamyl aldehyde and phosphoric acid is used as a fluorescence derivating agent, mixed liquor of methyl tertiary butyl ether, petroleum ether and methyl alcohol is used as mobile phase developing solvent, a chromatographic sheet is used as an immobile phase, after the ethyl carbamate developed by a thin layer is reacted with the fluorescence derivating agent, accordingly, green fluorescent spots can be observed at the position of 365 nm through a common ultraviolet analysis meter, the Rf value is 0.85, and the lowest drug loading capacity of a thin layer plate is 50 ng of ethyl carbamate. According to the limiting standard of 5 mg/L ethyl carbamate in wine, 2.5 mg/L EC can be detected directly, and the sample application amount of the thin layer plate is generally 20 microliters maximally. The method is small in number of needed samples, rapid, high in sensitivity, simple in step, small in number of needed equipment and easy to operate. In accordance with the principle, a rapid test kit can be researched and developed, and the method is used for rapidly detecting the ethyl carbamate in alcoholic beverages and fermented food.

The invention provides a method for preparing a plasma nitrided gate dielectric layer. The method is characterized in that the method includes the steps of providing a substrate, forming a silicon dioxide layer on the substrate and doping nitrogen into a silicon oxide layer under the temperature condition of minus 100 degrees to 0 degree. With the nitrogen doped under the low temperature of minus 100 degrees to 0 degree; diffusion effect of nitrogen ions is reduced; more nitrogen ions gather on the upper surface of the silicon dioxide layer; more bonding between Si-O bond and nitrogen ions is interrupted; nitrogen content on the upper surface of the plasma nitrided gate dielectric layer is increased. Thus, not only is leakage current density reduced but also a high gate capacitance is provided. Furthermore, reliability of the device is improved, and B+ is inhibited from diffusing from gate polysilicon to gate oxide.

A side-gusset bag has front and back face panels each having two longitudinally extending side edges. Two folded side panels are each joined to the face panels at the side edges and each having a center longitudinally extending crease between the respective side edges. A handle assembly consists of a pair of substantially identical handle halves each formed by two longitudinally spaced ends fixed to one of the side folds to a respective side of the crease thereof and a middle section extending between the respective ends and formed unitarily therewith of plastic film. The middle sections are transversely spaced and form an open longitudinally extending gap at least 2 mm wide and aligned with the respective crease. The middle sections extend transversely over less than 80% of a transverse width of the one side fold and have outer edges space at least 5 mm from the respective side edges.

The invention discloses a variable cross-section Hopkinson pressure bar device, and belongs to the field of impact dynamic mechanical property experiments. The device comprises an air pressure power system, a mounting frame arranged at the front end of the air pressure power system, a dynamic impact rod part system arranged on the mounting frame, a data collection system arranged on the dynamic impact rod part system, a safety protection system arranged on the side of the dynamic impact rod part system and a residual air pressure discharge system, according to the invention, a variable cross-section incident rod is not adopted in the experiment process; compared with an existing mode that an incident rod is manufactured into a variable cross-section rod, the diffusion effect is reduced, the shape and experiment precision of incident waves are prevented from being influenced by the diffusion effect, experiment protection measures are taken through a safety protection system, personnel safety is high. Meanwhile, residual air pressure is eliminated through a residual air pressure exhaust system, the experiment frequency is reduced, and experiment efficiency is improved.

Embodiments relate to use of graphite nanoplatelets (GnP) to enhance the mechanical and durability characteristics of cement that may be used as cement sheaths in wellbores of oil and gas wells. Generally, undesired permeability of cement is caused by diffusion of trapped oil and/or natural gas through the cementitious matrix of the cement, leading to material degradation of the cement. Methods disclosed involve using modified GnPs (having physically modified surfaces or chemically modified surfaces energies) to generate a cementitious nanocomposite with uniformly dispersed GnPs, which can effectively arrest the undesired diffusion mechanism. Modified GnPs can also increase the strength of interfacial adhesion (e.g., interfacial bonds and interfacial energies) between the GnP and the cement matrix (e.g., hydrations of the cement). Physical modification of GnP can involve non-covalent treatment techniques. Chemical modification of GnP can involve covalent treatment techniques.

The invention discloses a method for forming a semiconductor structure, which comprises the following steps of: providing a layer to be etched and an initial sacrificial layer positioned on the layer to be etched; a patterned structure is formed on the initial sacrificial layer, an opening is formed in the patterned structure, and the opening exposes part of the surface of the initial sacrificial layer; taking the patterned structure as a mask, removing a part of the initial sacrificial layer, forming a groove in the initial sacrificial layer, the depth of the groove being smaller than the thickness of the initial sacrificial layer; modifying the initial sacrificial layer on the surface of the side wall and the surface of the bottom of the groove by taking the patterned structure as a mask to form a modified layer, and enabling the initial sacrificial layer to form a sacrificial layer; after the modified layer is formed, a mask structure is formed in the groove, and the surface of the mask structure is flush with the surface of the sacrificial layer; and after the mask structure is formed, the sacrificial layer is removed, a pattern structure is formed on the to-be-etched layer, and the pattern structure comprises a modified layer and the mask structure located on the modified layer. The semiconductor structure formed by the method is good in morphology.