162 results about "Crystal base" patented technology

The invention belongs to the technical field of nanometer biological materials, and particularly relates to rare earth-doped upconversion nanometer crystal-based fluorescent coding microspheres and a preparation method thereof. According to the principle that an upconversion material doped by different rare earth ions emits fluorescent light with different wavelengths under the excitation of an infrared light source, in the rare earth-doped upconversion nanometer crystal-based fluorescent coding microspheres, a strength ratio of the emitted fluorescent light with different wavelengths is usedas fluorescent codes, namely the number of the fluorescent codes is changed by changing the doping varieties and doping content of the rare earth ions in the process of synthesizing nanometer crystals or the fluorescent codes are regulated by controlling ratios of upconversion nanometer crystals of different varieties in a microsphere carrier material. By the fluorescent coding microspheres, the sensitivity and number of detection can be improved further, and a plurality of fluorescent report molecules with different colors can be used simultaneously. The coding microspheres has the wide application prospects in aspects of gene expression, mutual effect among proteins, the high-flux screening of biological samples, the detection of multichannel biological science, disease diagnosis, combined chemistry and the like.

A downhole crystal-based clock that is substantially insensitive to the factors that may cause frequency deviation as a result of downhole temperature. The clock may include a plurality of crystals, where a first crystal may be more stable, with respect to temperature, than a second crystal. The crystals may be thermally coupled together so that they may have substantially the same temperature. An error detector may monitor the differences between the frequencies associated with each crystal and provide this information to a storage device. This information may be determined prior to deploying the clock downhole. When deployed downhole, the signal from the error detector may be interpreted in light of the information in the storage device to provide a temperature measurement of the two crystals. The downhole temperature measurement then may be used to reduce frequency deviations in the downhole clock that may result from downhole temperatures.

A downhole crystal-based clock that is substantially insensitive to the factors that may cause frequency deviation as a result of downhole temperature. The clock may include a plurality of crystals, where a first crystal may be more stable, with respect to temperature, than a second crystal. The crystals may be thermally coupled together so that they may have substantially the same temperature. An error detector may monitor the differences between the frequencies associated with each crystal and provide this information to a storage device. This information may be determined prior to deploying the clock downhole. When deployed downhole, the signal from the error detector may be interpreted in light of the information in the storage device to provide a temperature measurement of the two crystals. The downhole temperature measurement then may be used to reduce frequency deviations in the downhole clock that may result from downhole temperatures.

A calibration method for calibrating at least one gamma radiation detector includes a monolithic scintillation crystal. The calibration method comprises obtaining event data for a plurality of scintillation events. The event data for each scintillation event includes a plurality of location sensitive signals observed by the at least one gamma radiation detector to be calibrated, applying an unsupervised learning algorithm to embed the event data on a low-dimensional manifold, and obtaining calibration data considering the low-dimensional manifold embedding.

The present invention provides a conductive paste characterized by a crystal-based corrosion binder being combined with a glass frit and mixed with a metallic powder and an organic carrier. Methods for preparing each components of the conductive paste are disclosed including several embodiments of prepare Pb—Te—O-based crystal corrosion binder characterized by melting temperatures in a range of 440° C. to 760° C. and substantially free of any glass softening transition upon increasing temperature. Method for preparing the conductive paste includes mixture of the components and a grinding process to ensure all particle sizes in a range of 0.1 to 5.0 microns. Method of applying the conductive paste for the formation of a front electrode of a semiconductor device is presented to illustrate the effectiveness of the crystal-based corrosion binder in transforming the conductive paste to a metallic electrode with good ohmic contact with semiconductor surface.

A system and method of detecting acousto-photonic emissions in optically turbid media that provide increased levels of detection sensitivity. The detection system includes an ultrasonic transducer, a laser, a photo-detector for detecting ultrasound-modulated laser light, and circuitry for processing the detected signals for subsequent analysis. The ultrasonic transducer generates an ultrasonic wave that propagates within an optically turbid medium. The laser generates a coherent light beam, which is split to form signal and reference beams. The signal beam is sent through the turbid medium, where it is phase modulated by the ultrasound. The ultrasound-modulated signal beam is provided to a photo-refractive crystal for subsequent interference with the reference beam to convert the phase modulation to intensity modulation. The DC offset of the signal beam intensity provides a measure of the magnitude of the mean phase shift induced by the ultrasound on the multiply scattered optical field within the turbid medium.

A process for reducing the poling field of congruent grown LiNbO3 and LiTaO3 crystal-based nonlinear optical devices and for the production of domain structures with precise reproducibility of the main parameters by depositing a thin layer of a stechiometric LiNbO3 film on the Z-face of a congruent LiNbO3 or LiTaO3 wafer. A new domain nucleation, evolution and stabilization process is provided to afford a uniform, short period domain superstructure for the conversion of near infra-red light to near ultraviolet, blue and green light

The invention discloses a method for processing soft and crisp LBO crystals based on a consolidated abrasive polishing pad, which is characterized by comprising the following steps: firstly, roughly polishing and machining LBO crystals by the polishing pad of diamond consolidated abrasive of which the granularity is less than or equal to 14 micrometers, wherein in the polishing and machining process, the polishing pressure is controlled to 50-600g / cm<2>, the revolving speed of a polisher is controlled to 10-200 rpm, the pH value of a polishing solution adopted by polishing is controlled to 2-6, and the temperature of the polishing solution is 20-30DEG C to roughly polish the LBO crystals; and then, finely polishing and machining the LBO crystals obtained from the rough machining by the polishing pad of cerium oxide consolidated abrasive of which the granularity is not more than 3 micrometers, wherein the polishing pressure is controlled to 50-600g / cm<2> in the fine polishing and machining process, the revolving speed for polishing is controlled to 10-200rpm, the pH value of a polishing solution adopted by polishing is controlled to 2-6, and the temperature of the polishing solution is 20-30DEG C until the surface quality satisfies a set requirement. The method has the advantages of high processing efficiency and high finished product rate and does not cause environmental pollution.

A piezoelectric ceramic composition that acquires excellent piezoelectric properties even when it is fired at a low temperature is offered. The piezoelectric ceramic composition possesses a composition corresponding to a solid solution that contains a first compound having a rhombohedral crystal-based perovskite structure, a second compound having a tetragonal crystal-based perovskite structure, and a third compound. The third compound is a compound oxide containing Bi as a first component element, Fe or Mn as a second component element, and a hexavalent metallic element as a third component element. The hexavalent metallic element is at least one kind selected from W and Mo.

A downhole crystal-based clock that is substantially insensitive to the factors that cause frequency deviation. The clock may be maintained at a predetermined temperature using a temperature sensing device and a heating device, where the predetermined temperature corresponds to the temperature at which the crystal experiences only slight frequency deviation as a function of temperature. A microprocessor may monitor the clock and compensate for long-term aging effects of the crystal according to a predetermined algorithm. The predetermined algorithm may represent long-term aging effects of the crystal which were derived by comparing the crystal clock to a more accurate clock (e.g., an atomic clock) prior to placing the clock downhole. In this manner, the crystal-based clock may be substantially free from the factors that cause frequency, and therefore time variations.

The invention belongs to a dye-sensitized solar cell and particularly discloses a solid electrolyte for a solar cell based on an ionic crystal. The solid electrolyte includes the following components: 50-89 percent by weight of non-polymerized ionic liquid, 10-40 percent by weight of ionic crystal and 1-10 percent by weight of iodine simple substances, wherein the non-polymerized ionic liquid is selected from one or a mixture of more than two (comprising two types) of compounds expressed by a chemical structural formula; in the formula, p is equal to 1-6; and a chemical structural general formula of the ionic crystal is shown in the description. According to the solid electrolyte disclosed by the invention, a crystal base element is introduced in the solid electrolyte, so that the light scattering phenomenon can be increased and further the efficiency of the battery is increased; and finally, the obtained solar cell is high in photoelectric conversion efficiency, wide in applicable temperature and capable of adapting to different light intensities.

A piezoelectric ceramic composition having a large piezoelectric constant (d) and as well having a large Qm value is to be provided. The piezoelectric ceramic composition aimed at has a composition corresponding to a solid solution containing a first compound possessing a rhombohedral crystal-based perovskite structure, a second compound possessing a tetragonal crystal-based perovskite structure, and a third compound. The third compound is a compound oxide containing Bi as a first component element, Mn as a second component element, and a tetravalent metallic element or a pentavalent metallic element as a third component element. The tetravalent metallic element is at least one member selected from the group consisting of Ti, Zr, Hf, and Sn. The pentavalent metallic element is at least one member selected from the group consisting of Nb, Ta, and Sb.

The invention discloses a two-camera diameter measurement method for Czochralski crystal based on a digital signal processor, which comprises a plurality of steps: collect the image at the stages of crystal growth and equi-diameter by adopting standard industrial double CCD camera; carry on the processes of edge detection, noise removal, data fitting, data filtering and data compression for the image information by utilizing a core processor with embedded structure based on DSP to realize the precise measurement on the diameter of monocrystalline silicon rod; finally, communicate the measurement radius and compressed image information with a host computer through the Ethernet interface and TCP / IP protocol. The two-camera diameter measurement method for Czochralski crystal based on a digital signal processor has the advantages that by utilizing the core processor with embedded structure, the measurement method has high reliability and no host machine resources are occupied; by adopting standard industrial double CCD camera to process the diameters at different stages respectively, the measurement method has high accuracy and low cost; by adopting the techniques of complex edge detection, noise removal, least squares fitting, extreme value filtering, data compression and algorithm level optimization, the measurement method has strong function, high accuracy and fast speed.

The invention belongs to the technical field of crystal growth and in particular relates to a method and device for growing silicon carbide signal crystals based on physical vapor transport technology. The method is characterized in that seed crystals are positioned at the bottom of a crucible and in the low temperature zone; the raw materials are positioned at the top of the crucible and in the high temperature zone; and in the growth process, the seed crystals are placed at the bottom of the crucible, without being stuck to or fixed on the crucible cover. The method is characterized by using the silicon carbide polycrystalline ingots as the raw materials and fixing the silicon carbide polycrystalline ingots at the top of the crucible. The method and the device can effectively avoid that the crystals obtained during seed crystal shedding or growing in the growth process have excessive stress due to improper seed crystal sticking or fixing, meanwhile, as the polycrystalline ingots are used as the raw materials, the gas phase components are distributed more uniformly in the growth cavity, and the grown crystals have better uniformity and higher growth repeatability.

The invention relates to a LaBr3(Ce) crystal-based multi-channel gamma energy spectrum logging instrument. The instrument comprises a probe part, an operating platform, a cable and a winch, wherein the probe part comprises a LaBr3(Ce) crystal gamma ray detector formed by combining LaBr3(Ce) and a photomultiplier, a spectroscope amplifier, a peak holding circuit, a pulse amplitude analyzer and a high and low voltage power supply; the operating platform comprises a power supply converter and a computer; and the spectroscope amplifier receives a pulse signal from the detector, the pulse signal is input into the pulse amplitude analyzer through the peak holding circuit after passing through the spectroscope amplifier, and digital information output by the pulse amplitude analyzer is connected with a 485 communication interface of the computer through a 485 communication interface of the probe, and the cable. The logging instrument can directly measure the characteristic energy spectra of various radionuclides such as a uranium family, a thorium family, potassium and the like in nuclear resource logging, and has the characteristics of high energy resolution, measuring efficiency and stability, and the like.

A piezoelectric ceramic composition that acquires excellent piezoelectric properties even when it is fired at a low temperature is offered. The piezoelectric ceramic composition possesses a composition corresponding to a solid solution that contains a first compound having a rhombohedral crystal-based perovskite structure, a second compound having a tetragonal crystal-based perovskite structure, and a third compound. The third compound is a compound oxide containing Bi as a first component element, Fe or Mn as a second component element, and a hexavalent metallic element as a third component element. The hexavalent metallic element is at least one kind selected from W and Mo.

A crystal foundation having dislocations is used to obtain a crystal film of low dislocation density, a crystal substrate, and a semiconductor device. One side of a growth substrate (11) is provided with a crystal layer (13) with a buffer layer (12) in between. The crystal layer (13) has spaces (13a), (13b) in an end of each threading dislocation D1 elongating from below. The threading dislocation D1 is separated from the upper layer by the spaces (13a), (13b), so that each threading dislocation D1 is blocked from propagating to the upper layer. When the displacement of the threading dislocation D1 expressed by Burgers vector is preserved to develop another dislocation, the spaces (13a), (13b) vary the direction of its displacement. As a result, the upper layer above the spaces (13a), (13b) turns crystalline with a low dislocation density.

A crystal foundation having dislocations is used to obtain a crystal film of low dislocation density, a crystal substrate, and a semiconductor device. One side of a growth substrate (11) is provided with a crystal layer (13) with a buffer layer (12) in between. The crystal layer (13) has spaces (13a), (13b) in an end of each threading dislocation D1 elongating from below. The threading dislocation D1 is separated from the upper layer by the spaces (13a), (13b), so that each threading dislocation D1 is blocked from propagating to the upper layer. When the displacement of the threading dislocation D1 expressed by Burgers vector is preserved to develop another dislocation, the spaces (13a), (13b) vary the direction of its displacement. As a result, the upper layer above the spaces (13a), (13b) turns crystalline with a low dislocation density.

A piezoelectric ceramic composition having a large piezoelectric constant (d) and as well having a large Qm value is to be provided. The piezoelectric ceramic composition aimed at has a composition corresponding to a solid solution containing a first compound possessing a rhombohedral crystal-based perovskite structure, a second compound possessing a tetragonal crystal-based perovskite structure, and a third compound. The third compound is a compound oxide containing Bi as a first component element, Mn as a second component element, and a tetravalent metallic element or a pentavalent metallic element as a third component element. The tetravalent metallic element is at least one member selected from the group consisting of Ti, Zr, Hf, and Sn. The pentavalent metallic element is at least one member selected from the group consisting of Nb, Ta, and Sb.

The invention relates to a phononic crystal structure and design method for ship vibration isolation. The structure comprises a phononic crystal base, a spring, and a tungsten slug, the phononic crystal base is of a honeycomb structure distributed periodically, the spring is symmetrically arranged on the inner wall of a honeycomb, the tungsten slug is arranged in a cavity in the inner portion of the honeycomb, the outer wall is abutted against the top of the spring, the top face and the four angles of the bottom face of the phononic crystal base are respectively connected with an upper link block and a lower link block, and the upper link block and the lower link block are connected with a ground wire. The phononic crystal structure and design method for ship vibration isolation use a local periodic resonance principle, have an elastic band wave gap, and increase the vibration isolation difference.

A downhole crystal-based clock that is substantially insensitive to the factors that cause frequency deviation. The clock may be maintained at a predetermined temperature using a temperature sensing device and a heating device, where the predetermined temperature corresponds to the temperature at which the crystal experiences only slight frequency deviation as a function of temperature. A microprocessor may monitor the clock and compensate for long-term aging effects of the crystal according to a predetermined algorithm. The predetermined algorithm may represent long-term aging effects of the crystal which were derived by comparing the crystal clock to a more accurate clock (e.g., an atomic clock) prior to placing the clock downhole. In this manner, the crystal-based clock may be substantially free from the factors that cause frequency, and therefore time variations.

The invention discloses a TiO2 mesoscopic crystal based trypsin photoelectrochemical detection method. According to the method, a polyethylenimine(PEI)-sensitized TiO2 octahedral anatase mesoscopic crystal is utilized as a photoactive substrate material, and a signal amplification function on the substrate material by boron-doped carbon quantum dot labeling peptide (B-CODs@petide) is utilized to prepare a photoelectrochemical sensor to be applied to trypsin detection. Based on the stability and excellent conductivity of PEI, PEI and OAM can be compounded to accelerate the transfer rate of photo-generated electrons and improve photocurrent signals; through the introductions of B-CODs with the competitive light capturing ability and space hampered peptide chains, the photocurrent signals can be significantly reduced; when a modified electrode is incubated in a trypsin solution, trypsin can conduct catalytic hydrolysis on peptide bonds, and B-CODs@petide can be released from the surface of the electrode, so as to improve the photocurrent signals; the photocurrent signals and the trypsin concentration are linear in the range of 1*10<-7> to 1.0 mg / mL. The method can be used for monitoring screening of various proteases and inhibitors in early diagnoses of different diseases.

The invention relates to a preparation method of a two-dimensional carbide crystal-based polyimide organic positive electrode material. A two-dimensional carbide crystal (MXene) with a structure is adopted as a substrate material, and polyimide (PI) is in-situ polymerized on the MXene substrate by a solvothermal method, and then carbonizing is carried out in a nitrogen atmosphere to obtain the two-dimensional carbide crystal-based polyimide organic positive electrode material. The PI obtained by the method is uniformly loaded on the MXene substrate, and the method has the advantages of simpleprocess, mild conditions, low cost and the like. The prepared carbide-based polyimide organic positive electrode material with a two-dimensional structure has excellent electrochemical performance when being used as a positive electrode of a lithium ion battery, has excellent rate performance that the capacity can reach 150 mAh*g<-1> under a charge-discharge current of 50 mA*g<-1> and the capacityis 30 mAh*g<-1> under 500 A*g<-1>, and has a super long circulation life that the capacity retention rate exceeds 70% after 1000 times of circulation at 0.5 A*g<-1>. The method provides good experimental data and theoretical support for research and application of MXene and organic materials in the electrochemical field.

A crystal oscillator-based module, which includes a crystal resonator receiving a conditioned signal from a first bus and passing a resonator signal to a sustaining stage amplifier. A synchronization range expansion circuit is connected between a gain control network and the resonator. A tri-state buffer has a main input connected to receive the resonator signal through a buffer. The output of the tri-state buffer is connected to a second bus, through a matching network if necessary. A synchronous clock system can be formed by connecting these modules alternately to the two busses. The tri-state buffer also has a control input, which may be connected to a delay circuit between Vcc and ground, so as to allow hot swapping and for other benefits.

The invention relates to a method for polishing LBO(lithium boric oxide) crystal based on crystal oxidant. The method for polishing LBO crystal comprises the following steps: corundum powder with particle size smaller than W10 is used as grinding material to grind LBO crystal; coarse polishing of LBO crystal is carried out by using cerium oxide polishing solution with particle size no more than 1 m; the alkaline colloid polishing solution with particle size of 50nm-100nm is used for polishing; the LBO crystal surface is immersed in organic solvent and treated with ultrasonic cleaning machine of ultrasonic etching treatment; the LBO crystal is re-polished on the asphalt plate by using anhydrous ethanol and ether mixture. Compared with the prior art, the method for polishing LBO crystal has the advantages that in the process of polishing, the crystal oxidant is added, and the LBO crystal can be polished more quickly and efficiently; besides, the design fixture can be applied to the low cost dual shafts lapping machine, which is suitable for laboratory and mass processing; the method for polishing LBO crystal is of simple operation and strong reliability, and is suitable for grinding and polishing various kinds of similar crystals, and the process flow is short in time and convenient for popularization.

The invention relates to a growth method for controlling the diameter of a rod-like sapphire crystal based on a protective atmosphere. An airflow introduction passage is distributed around the upper end of a mold within a thermal field when a crystal is grown, gas flowing in from the airflow introduction passage performs convection heat dissipation on the upper end of the mold, and the heat dissipation strength of the mold is controlled by adjusting the flow rate of the gas so as to adjust the thickness of a liquid film at the solid-liquid interface of the crystal and change the size and shape of a sapphire product; the purpose of changing the diameter of the crystal is fulfilled by controlling the flow rate of the gas scouring the surface of the mold based on the size and shape of the sapphire; when the diameter of the grown crystal needs to be increased, the velocity of the gas flowing into the airflow passage can be increased; when the diameter of the grown crystal needs to be reduced, the velocity of the gas flowing into the airflow passage can be reduced. The growth method disclosed by the invention has the advantages that the shape of the grown crystal is controlled by adopting the method of cooling the mold with gas flow, so that the influence of external disturbance on the shape of the crystal can be overcome in the growth process; in addition, the growth method can also be used for growing a crystal in a specific shape.

The invention discloses an electro-optical crystal based quick polarization control method, which is characterized by comprising a feedback control circuit composed of a polarization control module, a DSP module and a voltage amplification module, wherein the polarization control module comprises an electro-optical crystal array, a polarization-maintaining beam splitter and a polarization detector. A controlled light path is input into the polarization control module and is subjected to beam splitting by the polarization-maintaining beam splitter after passing through the electro-optical crystal array, wherein 95% of the light is output and the rest 5% is output to the polarization detector, after detection, four-way analog voltage related to polarization state is output and is sampled and operated by the DSP module, the DSP module outputs four-way analog voltage for controlling the electro-optical crystal array, the four-way analog voltage is loaded on the electro-optical crystal array in the polarization control module after being amplified by the voltage amplification module, and the polarization state of the controlled light path is changed, thus realizing polarization control. The feedback control speed and the accuracy of the polarization control method of the invention are superior to the feedback control speed and the accuracy of the traditional control methods.

A method of calibrating detectors in a detector ring of a PET scanner, each detector including a plurality of crystals, the PET scanner having a field of view, is disclosed. The method comprises collecting timing data indicative of coincidence events occurring between each pair of crystals within the field of view. The method further comprises determining a detector adjustment value for each detector, determining a crystal adjustment value for each crystal in each detector, and discretizing the crystal adjustment value for each crystal to produce a discretized crystal adjustment value for each crystal. Lastly, the method comprises calibrating each detector by applying the discretized crystal adjustment value for each crystal in each detector to the collected timing data indicative of coincidence events.

The invention discloses a preparation method of an enhanced multiphase crystal based on calcite and aragonite. The preparation method mainly solves the problems that in the prior art, a calcium carbonate preparation method is complicated, expensive and not easy to control whiteness. The preparation method comprises the steps of firstly mixing calcium chloride, magnesium chloride, sodium carbonate and sodium hydroxide with deionized water so as to prepare into solutions; then mixing the calcium chloride solution, the sodium carbonate suspension liquid and the sodium hydroxide suspension liquid, heating, and stirring to prepare into a calcite and aragonite multiphase suspension liquid; adding a magnesium chloride water solution into the calcite and aragonite multiphase suspension liquid, and preparing into the enhanced multiphase crystal based on calcite and aragonite; precipitating, cleaning, drying, and grinding to obtain lamellar crystals with the thickness being 0.05 to 0.1 micrometer, the diameter being 0.2 to 4 micrometers and uniform size distribution. According to the preparation method of the enhanced multiphase crystal based on calcite and aragonite provided by the invention, the whiteness of the crystal is improved, the used raw materials are cheap, the process is simple, and the enhanced multiphase crystal can be applied in manufacturing plastics, rubbers, catalysts, medicines, ceramics, papermaking, ink and coatings.

The invention discloses an ultraviolet laser. A frequency tripling crystal is fixed on a frequency tripling crystal base; three rotational degrees of freedom of the frequency tripling crystal can be adjusted through the frequency tripling crystal base; a frequency doubling crystal is fixed on a frequency doubling crystal base; and three rotational degrees of freedom of the frequency doubling crystal can be adjusted through the frequency doubling crystal base. Separate adjustment of the frequency tripling crystal and the frequency doubling crystal is realized, and mutual influences are avoided. The three rotational degrees of freedom of the frequency doubling crystal and the frequency tripling crystal can be adjusted independently through the frequency tripling crystal base and the frequency doubling crystal base, and adjustment of the degrees of freedom of the frequency doubling crystal and adjustment of the degrees of freedom of the frequency tripling crystal do not influence each other. Through adoption of the ultraviolet laser, rapid and convenient adjustment is realized, and higher efficiency and a better adjustment effect are achieved.