281 results about "Phase stability" patented technology

The invention discloses a method for preparing a rare earth oxide doped zirconia thermal barrier coating with a craze crack structure, which solves the problems of low thermal shock resistance property, difficult further thermal conductivity reduction and the like of the thermal coating prepared by conventional plasma spraying. Under the condition of the plasma spraying technology, the preheating temperature of a base body, the moving speed of a plasma spraying gun and a powder delivery rate are adjusted, then a rare earth oxide doped zirconia thermal barrier coating (BH-TBCO1) with a craze crack structure and stable thermodynamics is prepared. The rare earth oxide doped zirconia thermal barrier coating with a craze crack structure has good high-temperature phase stability at the temperature below 1300 DEG C; the thermal insulation property of the thermal barrier coating is further enhanced, and the thermal insulation temperature achieves more than 150 DEG C and is enhanced by more than 50% when compared with the coating prepared by the conventional plasma spraying; the thermal shock life of the coating exceeds 4000 cycles and is enhanced by more than 1 time when compared with the coating prepared by the conventional plasma spraying.

This invention relates to thermal spray coatings on a metal or non-metal substrate. The thermal spray coating comprises a partially or fully stabilized ceramic coating, e.g., yttria stabilized zirconia coating, and has sufficiently high thermodynamic phase stability to provide corrosion and / or erosion resistance to the substrate. This invention also relates to methods of protecting metal and non-metal substrates by applying the thermal spray coatings. The coatings are useful, for example, in the protection of integrated circuit manufacturing equipment, internal chamber components, and electrostatic chuck manufacture.

Antiperspirant emulsions which exhibit excellent phase stability even in the presence of an effective concentration of antiperspirant salts in solution and which are thickened are obtainable by dispersing a hydratable polymer and particularly an amphoteric or cationic modified starch in an aqueous emulsion forming a viscous emulsion, often at an elevated temperature, subjecting the emulsion to high shear, thereby reducing the droplet size of the dispersed oil phase, bringing the emulsion to below 40° C. and introducing the antiperspirant, preferably in aqueous solution. The viscous emulsion subjected to high shear mixing desirably has a Sheer Stress of 10 to 500 Pa. The resultant emulsions show good phase stability even when they contain aluminium / zirconium antiperspirant salts that promote instability and even at elevated storage temperatures such as at 50° C.

The present invention integrates the surface plasmon resonance and common-path phase-shift interferometry techniques to develop a microscope for measuring the two-dimensional spatial phase variation caused by biomolecular interactions on a sensing chip without the need for additional labeling. The common-path phase-shift interferometry technique has the advantage of long-term stability, even when subjected to external disturbances. Hence, the developed microscope meets the requirements of the real-time kinetic studies involved in biomolecular interaction analysis. The surface plasmon resonance microscope of the present invention using common-path phase-shift interferometry demonstrates a detection limit of 2×10−7 refractive index change, a long-term phase stability of 2.5×10−4π rms over four hours, and a spatial phase resolution of 10−3 π with a lateral resolution of 100 μm.

An antenna device comprises a reflecting plate, a top shielding cover arranged on one side of the reflecting plate, a first frequency band feed network, a substrate, a first frequency band radiating face, a first frequency band medium layer, a second frequency band radiating face, a second frequency band medium layer, at least one first frequency band feed probe, a second frequency band feed probe, a second frequency band feed network arranged on the other side of the reflecting plate and a low-noise amplifying circuit. The top shielding cover is fixed on the substrate, the first frequency band radiating face is connected to the first frequency band feed network through the first frequency band feed probe, the second frequency band radiating face is larger than the first frequency band radiating face and positioned on the second frequency band medium layer, the second frequency band radiating face is connected to the second frequency band feed network through a second frequency band feed probe, and the first frequency band feed network and the second frequency band feed network are connected with the low-noise amplifying circuit. The invention further provides a receiving system. By means of the antenna device and the receiving system, mutual interference between all frequency points is avoided, the phase stability of an antenna is improved, and the measuring accuracy is improved.

The invention discloses a microwave optical fiber link device for long-distance transmission of radar reference frequency signals and relates to the technology of radar detection. The microwave optical fiber link device consists of an optical emitter, an optical receiver, a Faraday rotating mirror, an optical circulator, a polarization maintaining optical fiber, a radio-frequency power amplifier and the like. By subjecting microwaves to electric-optical and optical-electric conversion and utilizing the advantages of low insertion loss and high-temperature phase stability of the optical fiber, the microwaves are transmitted in low phase fluctuation and loss in the long distance. The microwave optical fiber link device can be used for transmission of rate-aided signals of spatial long-base line interference synthetic aperture radar (SAR) and transmission of reference frequency signals of radar systems such as phased array radars and multi-base radar monitoring net. Besides, phase changes caused by environmental factors such as temperature and irradiation can be accurately compensated during long-distance transmission of X-wave band microwave signals, and meanwhile, the microwave optical fiber link device has ultrawide radio-frequency (RF) working band and can be developed for transmission of radar reference frequency signals ranging from 50MHz to18GHz.

The invention discloses a natural rubber liquid slurry containing chitosan / sericin and a preparation method thereof, and belongs to the field of high polymer chemistry. The invention is characterized in that the preparation method comprises the following steps: respectively preparing a chitosan water solution and a sericin water solution, mixing the two solution, and regulating the pH value of the mixture to 9-11 by using ammonia water and a citric acid solution; and adding the obtained chitosan / sericin mixed solution to a natural latex slurry, adding a laurate surfactant, and mechanically stirring the mixture uniformly to obtain the natural rubber liquid slurry containing chitosan / sericin. The invention has the advantages that the chitosan has the functions of adsorbing water soluble proteins in the latex, inhibiting bacteria and viruses from breeding, and the like; and the sericin has the functions of oxidation resistance, allergy resistance, hydrophilia, oil resistance and the like, thereby enhancing the emulsion phase stability and the preservation effect of the natural latex. In particular, the product obtained by using the method overcomes the defects of short service life, easy aging and sticking, poor oil resistance, initiation of protein allergy and the like in the traditional natural latex product.

The invention discloses a lithium manganate material for surface treatment and a preparation method thereof. The lithium manganate material for surface treatment takes doped and modified lithium manganate as a basal body, the basal body is coated by a surface treatment material to form a surface coating layer which is a product of the surface treatment material, a product obtained by partially decomposing the surface treatment material, or a product obtained by completely decomposing the surface treatment material, and the concentration of the surface coating layer is in graded distribution namely gradually reducing from outside to inside; and the general formula of the basal body is LixMn2-yMyO4-zXz, wherein x is more than or equal to 0.95 and less than or equal to 1.15, y is more than or equal to 0 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.4, M is one or more of Li, Cr, Co, Ni, Mg, Ca, Sr, Ba, Na, K, Al, Be, B, Ti, Zr, Cu, Zn, Ga, Sn or V, the doping element X is one or more of F, Cl, Br, I or S, and the surface treatment material is one or more of organic substances containing Ti and / or Al. Through the surface treatment on the doped and modified lithium manganate, the compatibility of the lithium manganate material with an electrolyte is increased, less Mn is dissolved out in the electrolyte, the high-temperature storage performance and high-temperature cycle performance of the lithium manganate material are improved, and the bulk phase stability and the surface stability of the material are improved at the same time.

The invention relates to a method and a system for improving phase stability of a photon microwave signal. The method comprises the following steps that: light output by a laser device is divided into two beams of vertical polarized light by a polarized light beam splitter; a reference light is combined with transmission light via a polarized light beam combiner after frequency-shift, and passes through the polarized light beam splitter after passing through a light micro-wave modulation and a light delay link, finally the reference light is interfered by the transmission light after being rotated and polarized by a faraday rotation mirror, and then a beat frequency signal is detected through a low-speed photodetector; the beat frequency signal is subjected to phase comparison with a 25MHz reference signal to obtain a phase disturbance situation of a transmission system, and the signal output by a phase discriminator is used as a control signal of a microwave photonic phase shifter after being processed. The system comprises a DFB (distributed feedback) laser device, the polarized light beam splitter, an acoustooptic frequency shifter, the polarized light beam combiner, an RF (radio frequency) signal generator, a Mach-Zehnder modulator, the photon microwave signal phase shifter, the polarized light beam splitter, an optical interferometer, a low-frequency optical receiver phase discriminator and a proportion integrator.

Optimized Cu—Mn spinel compositions, with optimal spinel phase formation and phase stability properties, for a plurality of ZPGM catalysts in underfloor and closed-loop coupled catalyst applications are disclosed. Plurality of Cu—Mn spinel compositions are prepared with variations of molar ratios. Effect of calcination temperature is analyzed to determine spinel phase formation and phase stability, as well as the effect of calcination temperature on lattice parameter of spinel, as correlated to spinel phase formation and phase stability of optimal Cu—Mn spinel compositions disclosed. Disclosed Cu—Mn spinels with enhanced spinel phase formation and phase stability may be suitable for ZPGM catalyst systems used in a vast number of TWC applications.

The invention discloses a multi-component rare earth oxide-doped modified YSZ thermal spraying powder and a preparation method thereof. A coating prepared by the above powder is obviously improved in high-temperature phase stability and resistance to high-temperature sintering performance, compared with that of the conventional 8 YSZ material. The Gd2O3-Yb2O3-Y2O3-ZrO2(HfO2) power provided in the invention is composed of 5.5-6.5 wt% of Y2O3, 2.5-3 wt% of Gd2O3, 2.5-3.5 wt% of Yb2O3, 87-89.5 wt% of ZrO2-HfO2, and 2 wt% or less of HfO2, wherein HfO2 is the associated material of the ZrO2. Raw materials are prepared through subjecting the slurry to the sparying, drying, agglomerating, granulating, drying, sieving, high-temperature calcination, plasma densification treatment, drying and sieving process. In this way, the loose density of obtained spherical thermal spraying powders is 1.8-2.3 g / cm<3>, and the fluidity of obtained spherical thermal spraying powders is smaller than 50s / 50g, wherein most of the obtained spherical thermal spraying powders are in metastable tetragonal phase. The powder is prepared through multiple different heat treatment means, so that the high-temperature stability and the performance of the spraying powder and the sprayed coating are improved. Meanwhile, the heat-shock life of a plasma sprayed coating prepared by the above powder is up to over 2300 times at 1200 DEG C, and is far higher than that of a 8 YSZ coating in the same condition.

The invention provides a quadruplicated frequency signal optical fiber arbitrary point steady-phase distribution system based on phase conjugation and belongs to the technical field of optical fiber steady-phase distribution; the system comprises an annular optical fiber link structure mainly composed of a local end, n far-end stations, n +1 sections of optical fiber links and n optical fiber couplers, wherein the local station comprises a microwave source, a dual-carrier wave optical signal generating module, a phase conjugated optical signal generating module, an optical fiber coupler, a first photoelectric detector and an optical fiber circulator; and each of the far-end stations respectively comprises an electro-optical frequency mixing module, an optical amplifier, a second photoelectric detector, an electric amplifier and an electric filter. The main device used by the system is a photonic device; due to the high-frequency broadband characteristic of the photonic device, the system can achieve optical fiber long-distance stable phase distribution of higher frequency signals; and the problem of deterioration of the phase stability precision caused by local oscillator leakage and harmonic interference introduced when an electric mixer is used is effectively avoided.

The effect of aging temperature on oxygen storage materials (OSM) substantially free from platinum group (PGM) and rare earth (RE) metals is disclosed. Samples of ZPGM-ZRE metals OSM, hydrothermally aged at a plurality of high temperatures are found to have significantly high oxygen storage capacity (OSC) and phase stability than conventional PGM catalysts with Ce-based OSM. ZPGM-ZRE metals OSM includes a formulation of Cu—Mn stoichiometric spinel structure deposited on Nb—Zr oxide support and may be converted into powder to be used as OSM application or coated onto catalyst substrate. ZPGM-ZRE metals OSM, after aging condition, presents enhanced level of thermal stability and OSC property which shows improved catalytic activity than conventional PGM catalysts including Ce-based OSM. ZPGM-ZRE metals OSM may be suitable for a vast number of applications, and more particularly in underfloor catalyst systems.

The invention discloses a co-extraction method of boron and lithium in brine; and a mixing extraction system is adopted to synchronously extract boron and lithium in the brine to realize separation ofboron and lithium from a brine basal body. Lithium and boron in an organic phase are reversely extracted by adopting acid solution and alkali solution to realize separation of boron and lithium. Lithium-contained reverse extracting liquid is condensed for cooling crystallization to prepare lithium chloride or precipitation to prepare lithium carbonate, and is directly condensed for crystallization to prepare boron sand or is acidified for concentration crystallization to prepare boric acid. The method only relates to conventional separation and enrichment operations, is simple in process andclosed in circulation, and realizes efficient recovery of boron and lithium. In addition, as boron and lithium are synchronously extracted, on the basis of simplifying operations and process steps, the problems of low extraction rate, weak organic phase stability and the like caused by mutual interference between boron extraction and lithium extraction organic phases in step-by-step boron and lithium extraction are solved.

An apparatus containing an integrated optical circuit that enhances phase stability of the injection-locking process of two slave lasers. The integrated optical circuit helps to reduce phase noise by keeping environmental or mechanical perturbations uniform everywhere on that circuit. Also, the integrated optical circuit provides connections for additional components to be coupled, which can monitor and control the performance characteristics of the integrated optical circuit and the injection-locking process.

The present disclosure describes ZPGM material compositions including LaMnO3 perovskite structure mixed with a plurality of support oxide powders to develop suitable ZPGM catalyst materials. Bulk powder ZPGM catalyst compositions are produced by physically mixing bulk powder LaMnO3 perovskite with different support oxide powders calcined at about 1000° C. XRD analyses are performed for bulk powder ZPGM catalyst compositions to determine La—Mn perovskite phase formation and phase stability for a plurality of temperatures to about 1000° C. ZPGM catalyst material compositions including La—Mn perovskite structure mixed with doped zirconia, La2O3, cordierite, and ceria-zirconia support oxides present phase stability, which can be employed in ZPGM catalysts for a plurality of DOC applications, thereby leading to a more effective utilization of ZPGM catalyst materials with high thermal and chemical stability in DOC products.

The invention relates to an LCL grid-connected inverter impedance remodeling method for restraining the influence of power grid background harmonic waves. The method comprises the following steps of:establishing a frequency domain model of an inverter grid-connected system, under the condition of considering a power grid operation mode, determining the value range of the system cutoff frequency,and introducing common point voltage feedforward compensation to perform advanced compensation on the phase of a frequency band near the cutoff frequency of the output impedance of the inverter; and increasing the phase angle stability margin of the system; and performing optimizing according to the target of the suppression effect of the background harmonic of the power grid and by taking the factors that the increasing of the fundamental frequency impedance of the inverter does not influence the output efficiency of the inverter and the phase stability margin of the medium-low frequency bandafter correction is larger than 30 degrees as constraint conditions, and determining the maximum value of the gain compensation coefficient of the compensation link within a limit value. The LCL grid-connected inverter impedance remodeling method for restraining the influence of power grid background harmonic waves has the advantages that the suppression effect on the background harmonic waves ofthe power grid is optimal while the stability of the grid-connected system is considered.

The invention relates to a high-gain multilayer dielectric composite dual-circular-polarization micro-strip array antenna, and belongs to the technical field of antennas. The high-gain multilayer dielectric composite dual-circular-polarization micro-strip array antenna comprises nine micro-strip antenna units, two groups of feed networks, a lower-layer dielectric substrate, an upper-layer dielectric substrate, a metal support, dielectric struts and a 90-degree bridge circuit. The high-gain multilayer dielectric composite dual-circular-polarization micro-strip array antenna is based on a micro-strip antenna theory, double layers of the micro-strip antenna units are capable of improving the gain of the antenna by 2dB as compared with the traditional micro-strip antenna units, the two groups of feed networks with equal amplitudes and identical phases are provided with one-dividing-into-two unequal power dividers, one-dividing-into-three equal power dividers and one-dividing-into-six equal power dividers and are reasonably arranged in limited space, and excellent amplitude and phase stability of each feed end is guaranteed; and a left-hand circular polarization mode and a right hand circular polarization mode can be implemented simultaneously, so that right hand circular polarization electromagnetic signals can be transmitted or received while left hand circular polarization electromagnetic signals are transmitted or received.

Systems and methods of self-referenced quantitative phase microscopy (SrQPM). The SrQPM systems and methods provide single-shot, full-field imaging capability for increased imaging speed, and near-common-path geometry for increased phase stability, allowing the study of internal structures of biological cells, live cell dynamics, and the like.

A resin blend composition is provided containing a polyol, an ethoxylate propoxylate surfactant initiated by a short chain compound, and a hydrocarbon blowing agent. The solubility and / or compatibility of the hydrocarbon carbon blowing agent in the polyol is increased and the phase stability of the resin blend composition is improved by the ethoxylate propoxylate surfactant. The resin blend is suitable for reaction with polyfunctional organic isocyanates to make cellular polyurethane and polyisocyanurate foams.

The present invention integrates the surface plasmon resonance and common-path phase-shift interferometry techniques to develop a microscope for measuring the two-dimensional spatial phase variation caused by biomolecular interactions on a sensing chip without the need for additional labeling. The common-path phase-shift interferometry technique has the advantage of long-term stability, even when subjected to external disturbances. Hence, the developed microscope meets the requirements of the real-time kinetic studies involved in biomolecular interaction analysis. The surface plasmon resonance microscope of the present invention using common-path phase-shift interferometry demonstrates a detection limit of 2×10−7 refractive index change, a long-term phase stability of 2.5×10−4π rms over four hours, and a spatial phase resolution of 10−3 π with a lateral resolution of 100 μm.

The invention discloses an in-situ synthesis method for preparing a composite thermal barrier coating, which comprises the following steps: mixing R2O3 / ZrO2 mixed powder, which is obtained by mixing R2O3 powder and ZrO2 powder and carrying out ball milling, with YSZ powder; and spraying a bonding layer surface on a high-temperature alloy matrix by a plasma spraying method, putting in a resistance furnace, and sintering at 1000-1400 DEG C under air conditions to prepare the R2Zr2O7-dispersed YSZ ceramic layer. The method eliminates the interface between the R2Zr2O7 rare-earth zirconate ceramic layer and the YSZ ceramic layer, so that the thermal barrier coating has high-temperature phase stability, has lower heat conductivity than the traditional YSZ, and lowers the oxygen permeability of the ceramic layer; and compared with the simple rare-earth zirconate ceramic layer, the composite thermal barrier coating has longer service life, and can satisfy the requirements for hot-end component long-term service, high-temperature oxidation resistance and the like.

The invention discloses a CMAS-resisting ceramic layer and a slurry method for preparing the CMAS-resisting ceramic layer, and belongs to the field of thermal barrier coating materials and preparation for the same. The CMAS-resisting ceramic layer is a LaPO4 ceramic layer. The slurry method is used for preparing the LaPO4 ceramic layer on a YSZ ceramic layer, and the wettability of the LaPO4 ceramic layer to molten CMAS is poor; after thermal treatment of 1250 DEG C is carried out, a mutual reaction layer is formed on the interface between the LaPO4 ceramic layer and the CMAS, so that further permeation of the molten CMAS is effectively prevented, and the original phase stability of the YSZ ceramic layer is maintained. Accordingly, the prepared LaPO4 ceramic layer can prevent permeation of the molten CMAS, has superior CMAS corrosion resistance and obviously prolongs the service life of a thermal barrier coating under the CMAS coupling effect.

The present invention details fabrication guidelines of integrated optoelectronic oscillators with frequency and phase stability, having higher frequency selectivity in a relatively small size (compared to the larger size of a higher order electrically realized RF filter), reduced temperature sensitivity, and minimized frequency drift. The integrated photonic components and RF oscillator may use Silicon photonics and microelectronic integration using CMOS and BiCMOS technology, eliminating the need for bulky and / or discrete optical and microwave components.

Variations of metal oxide materials used as support oxide for Cu—Mn spinel powder for ZPGM TWC applications are disclosed. Bulk powder catalyst samples of Cu—Mn spinel structure on MgAl2O4, Al2O3-9% BaO, Al2O3—SrO, Al2O3—CeO, CeO2—ZrO2 support oxides and among others are prepared using incipient wetness method. BET-surface area analysis is performed for selected support oxides before and after deposition of Cu—Mn spinel to analyze thermal stability. XRD analysis is performed for bulk powder catalyst samples to investigate Cu—Mn spinel phase formation, and phase stability for a plurality of temperatures to about 1000° C. Activity measurements under isothermal steady state sweep test condition may be performed under rich condition to lean condition for different aging temperature at about 800° C. and about 1000° C. Catalytic activity of samples may be compared to analyze the influence that selected support oxides may have on thermal stability and TWC performance of ZPGM materials for a plurality of TWC applications.

The invention discloses a time sequence processing method and device for a distributed target InSAR with enhanced space-time coherence. The method comprises the steps of carrying out threshold separation on a permanent scatterer (PS) and a distributed scatterer (DS) on the basis of an obtained single complex image data stack; performing phase stability analysis on separated PS candidate points bymeans of a StaMPS approach to obtain PS points; carrying out covariance matrix estimation on DS candidate points one by one through a maximum likelihood estimator and refining a covariance matrix through a bootstrapped coherence estimator; performing time sequence phase optimization on each DS candidate point; selecting DS points; constructing a two-layer network for the selected PS and DS points;carrying out phase error separation on an unwrapping phase after three-dimensional phase unwrapping is performed on the PS points and the DS points; utilizing the maximum likelihood estimator and a phase model to estimate geophysical parameters. The method can reduce the uncertainty of InSAR time sequence analysis caused by coherence loss and an ill-conditioned matrix, improve the quality controlof time sequence data processing and thus improve the estimation precision and reliability of products.