47results about How to "Suppressed ionization" patented technology

A luminous lamination structure includes a first layer made of n-type nitride semiconductor and a second layer made of p-type nitride semiconductor and disposed over the first layer wherein a luminous region is defined between the first and second layers. The second layer is removed to expose the first layer in a first area which is a partial surface of the first layer. A p-side electrode is disposed on a surface of the second layer and electrically connected to the second layer. An insulating film covers the p-side electrode. An n-side electrode electrically connected to the first layer is disposed in the first area. A reflection film disposed on the insulating film extends to the n-side electrode and electrically connected to the n-side electrode. The reflection film is made of silver containing alloy or silver.

A system for delivery of low-pressure dopant gas to a high-voltage ion source in the doping of semiconductor substrates, in which undesired ionization of the gas is suppressed prior to entry into the high-voltage ion source, by modulating electron energy upstream of the high-voltage ion source so that electron acceleration effects are reduced to below a level supporting an electronic ionization cascade. The gas delivery system in a specific application includes a gas flow passage, a voltage generator electrically coupled with at least a portion of the gas flow passage to impose an electric field thereon, and an obstructive structure that is deployed to modulate acceleration length of electrons of the low-pressure gas in relation to ionization potential of the gas, to suppress ionization in the gas flow passage.

The invention discloses flaky iron phosphate, and a preparation method and application thereof. The microscopic morphology of the flaky iron phosphate is a primary particle in a sheet shape with a thickness of 10 to 50 nm, a length of 100 nm to 3 [mu]m and a width of 100 nm to 3 [mu]m. The preparation method comprises the following steps of: weighing a ferrous ion solution and adding phosphoric acid and a crystal modifier; weighing a phosphorus salt solution and adding an oxidizing agent; carrying out mixing to obtain a mixed solution C, controlling the pH value of the mixed solution C to be 1.5-2.2, and carrying out a reaction to obtain pale yellow iron phosphate slurry; converting the iron phosphate slurry into white or pink-white iron phosphate slurry containing crystal forms under theconditions of stirring and heating, reducing a stirring speed by 20%-50% after the completion of the conversion, and carrying out ageing and heat preservation; performing solid-liquid separation, andcollecting a solid portion to obtain a crystalline iron phosphate precipitate; and washing the precipitate and then performing calcination to obtain the flaky iron phosphate. The iron phosphate of theinvention can be used for preparing lithium iron phosphate with high compaction density.

A solid-state image device including pixels arranged two-dimensionally, the pixels each including a photoelectric converter for converting incident light into an electric signal, is provided. The solid-state image device includes an output amplifier configured to amplify a photoelectric conversion output from each of the pixels, and a reference voltage amplifier configured to output a reference voltage. The solid-state image device selectively outputs the photoelectric conversion output and the reference voltage.

The invention relates to an MnS@CoMn-LDH composite material, and a preparation method and an application thereof. The preparation method of the composite material comprises the steps of 1) dissolvingsoluble manganese salt in water, then adding sulfide, carrying out a primary hydrothermal reaction, and carrying out centrifuging, washing and drying to obtain MnS; and 2) dissolving the soluble manganese salt, soluble cobalt salt, ammonium fluoride and urea in the water, then adding the MnS, carrying out a secondary hydrothermal reaction, and carrying out cooling, centrifuging, washing and dryingto obtain the MnS@CoMn-LDH composite material. The composite material is prepared into a working electrode for a supercapacitor. Compared with the prior art, the MnS@CoMn-LDH composite material is synthesized through the two-step hydrothermal reactions; the composite material contains rich mesopores and micropores so as to achieve good electrochemical performance; the preparation method of the composite material is simple and environment-friendly; the synthesis time is greatly shortened; and the large-scale production of high-purity MnS@CoMn-LDH composite materials is facilitated.

The invention provides a preparation method of an active region failure analysis sample of a semiconductor device. A mixed solution of hydrofluoric acid and acetic acid replaces hydrofluoric acid simply used in the prior art to remove an oxidation layer; compared with strong corrosion of hydrofluoric acid simply used, acetic acid in the mixed solution also ionizes hydrogen ions, ionizing of hydrofluoric acid can be inhibited, and excessive fluorine ions are prevented from participating in reaction in a corrosion process, so that damages to an active region of the semiconductor device can be reduced or avoided in the corrosion process; ultrasonic waves are used for oscillating the semiconductor device to allow a polycrystalline silicon layer lower than the surface of the active region to be protruded; removal of the polycrystalline silicon layer with polycrystalline silicon glue subsequently is facilitated; and the damages to the active region of the semiconductor device in a polycrystalline silicon layer removal process are avoided.

In an embodiment of the present ambient ionization experiment, the abundance of background chemicals relative to ions of interest is decreased by reducing the overall abundance of background chemicals introduced into the ionizing region. In an embodiment of the present invention, the reduction of unwanted background chemicals in the ionization region can be effected by limiting the area which the sample volume is deposited. In an embodiment of the present invention, the reduction of unwanted background chemicals in the ionization region can be effected by decreasing the duration of time that the sample is exposed to the atmospheric pressure ionization source. In an embodiment of the present invention, the reduction of unwanted background chemicals in the ionization region can be effected by limiting the sample volume. In an embodiment of the present invention dilution of the sample with water can be used to reduce the contribution of the background chemicals. In an embodiment of the present ambient ionization experiment, an ion intensifier is used to suppress ionization of background chemicals to permit more efficient ionization and detection of the molecules of interest.

A high electron mobility transistor using a Group III-V compound semiconductor comprises an undoped second channel layer laminated on an InP substrate via a buffer layer, an undoped first channel layer laminated on the second channel layer, and a doped electron-supplying layer laminated on the first channel layer. The first channel layer is composed of In_1-xGa_xAs and has an energy level of conduction band lower than that of the electron-supplying layer at the interface. The second channel layer is composed of a Group III-V compound semiconductor using a Group V element other than P, has an energy level of conduction band higher than that of the first channel layer, and has a band gap wider than that of the first channel layer.

An image sensor array includes a substrate and a plurality of pixels. Each pixel includes a single photon avalanche detector (SPAD), a quench device coupled to a respective SPAD and configured to quench an avalanche current, and time measurement circuitry configured to measure a time-of-flight of a photon. The SPAD has a trench coupled to the substrate and having a lattice mismatch with the substrate, and a substantially defect-free region coupled to the trench and configured to generate the avalanche current when the photon is detected in the defect-free region, wherein the trench and the defect-free region form an electrode. An imaging system includes an infrared laser configured to provide a pulse of light, and the image sensor array configured to receive the pulse from the infrared laser.

Ion sources are described for producing negative ion beams with low mass bias in which a neutral vapor of an electropositive element ionizes neutral atoms or molecules.

The invention provides a flotation collecting agent, a flotation reagent and a flotation method for improving the separation efficiency of ilmenite and gangue of ilmenite.The flotation collecting agent comprises a collecting agent A, the collecting agent A has a formula shown in the specification. In the formula, R1 is C1-C15 alkyl, C4-C15 cycloalkyl, allyl, ethynyl, phenyl, benzyl or benzyloxy; and R2 is hydrogen, C1-C15 alkyl, C4-C15 naphthenic base, propenyl, ethynyl, phenyl or benzyl. The collecting agent A serves as the flotation collecting agent of the ilmenite, benefited from the special synergistic effect of the benzene ring and the phosphate group, the collecting agent A shows good flotation selectivity and recovery rate, and the recovery rate and grade of the ilmenite can be improved.

The invention discloses a method for stably controlling the concentration of an ion mobility spectrometry chemical dopant. According to the invention, the method comprises the steps: employing a photoionization ion mobility spectrometry technology as a basic detection technology; in a positive ion high-voltage mode, optimizing the types of dopants, employing a combined adding mode of mixed dopants, and then selecting a dopant control mode to effectively control the release concentration of the dopant. therefore, signals can be remarkably enhanced under the low-concentration condition of dopan,the service life of dopan can be effectively prolonged, and meanwhile, nodes needing to be replaced by reagents are judged by utilizing peak pattern changes caused by reagent concentration changes; according to the method, high signal intensity under the low-concentration condition of dopant can be realized, and the detection sensitivity of a target sample can be improved.

The invention provides a dephenolization extraction agent as well as a preparation method and application thereof. The dephenolization extraction agent comprises a combination of methyl isobutyl ketone, a synergistic extraction agent and an antioxidant, wherein the antioxidant comprises C6-C9 saturated aliphatic ketone and/or C7-C9 saturated aliphatic alcohol. According to the dephenolization extraction agent, through compounding of specific components, on one hand, synergistic interaction is achieved on the dephenolization efficiency, on the other hand, ionization and oxidation of phenolic substances in the extraction process can be effectively inhibited, and the content of pollutants such as phenoxy anions, quinones and derivatives thereof which are higher in removal difficulty and higher in toxicity in wastewater is remarkably reduced. The dephenolization extraction agent is used for treating phenol-containing wastewater, the volume ratio range and the pH application range are wide, industrial operation is easy to achieve, the extraction efficiency of monohydric phenol and polyhydric phenol is high, the single-stage total phenol extraction efficiency reaches 97.4% or above, the concentration of an oxidation product benzoquinone in the extracted wastewater is extremely low, the biotoxicity of the wastewater is reduced, and the subsequent biochemical treatment is facilitated.

The invention provides a method for measuring urotropine content of rice and flour and a rice-flour product. The method comprises the following steps: 1, making a product to be measured into a sample;2, weighing the sample to a centrifuging tube, adding ammonium acetate for performing ultrasonic extraction and centrifuging, and placing supernatant into a volumetric flask; 3, continuously adding the ammonium acetate into the centrifuging tube, performing ultrasonic extraction and centrifuging, placing the supernatant into the volumetric flask used in step 2, and metering the volume of the supernatant to 10 mL with the ammonium acetate to obtain a clear sample liquid; 4, performing filtering with a water-phase microfiltration membrane to obtain a sample liquid to be measured; 5, measuring peak areas of a urotropine standard working liquid and the sample liquid to be measured with an efficient liquid phase chromatograph to obtain a standard curve equation; 6, calculating the urotropine content in the product to be measured. The method has the characteristics of high urotropine extraction efficiency, easiness in operation, high accuracy, high stability and high repeatability, so thata stable and reliable method for detecting urotropine in the rice-flour product is provided.

Provided is a semiconductor device including an N-channel high-voltage MOS transistor, in which wiring metal connected to a drain region is laid above a boundary portion between an oxide film formed by LOCOS process or the like on a low impurity concentration region and a high impurity concentration region forming the drain region, to thereby alleviate an electric field concentration at the boundary portion which is a contact portion between the low impurity concentration region and the high impurity concentration region by an electric field generated from the wiring metal toward a semiconductor substrate.