摘要:
The present invention provides a cold cathode electron source and a method for manufacturing the cold cathode electron source. The cold cathode electron source includes a substrate on which are deposited a catalyst metal layer, an insulation layer, and a gate metal layer; a cavity section formed through the catalyst metal layer, the insulation layer, and the gate metal layer; and an emitter realized through a plurality of carbon nanotubes, which are grown from walls of the catalyst metal layer exposed in the cavity section and which have long axes parallel to the substrate. The method includes depositing a catalyst metal layer, an insulation layer, and a gate metal layer on a substrate; forming a cavity section by removing a portion of the gate metal layer, the insulation layer, and the catalyst metal layer using a photolithography process; and forming an emitter by mounting the substrate on a chemical vapor deposition reactor and growing carbon nanotubes in a low temperature atmosphere of 500˜800 degrees Celsius (° C.).
摘要:
Provided is a leakage detection system and method using an image that may detect a leakage of high temperature high pressure steam using an image. The leakage detection method may include: obtaining an image of a target where a leakage of high temperature high pressure steam occurs; detecting, in the obtained image, an edge image before the leakage occurs and an edge image after the leakage occurs; detecting only a leakage edge image by comparing the edge image before the leakage occurs and the edge image after the leakage occurs; removing noise from the leakage edge image; and displaying the leakage edge image in which the noise is removed.
摘要:
An electron emission material includes an electron emission material main body, a base metal layer disposed on the electron emission material main body, and a thermal electron emission layer disposed on the base metal layer.
摘要:
An electron emission device is provided having a first substrate and a first electrode on the first substrate. A second electrode is electrically insulated from the first electrode. An electron emission source is electrically connected to the first electrode. A blocking layer is between the first electrode and the second electrode.
摘要:
A inhibition method of target mRNA expression includes: (a) obtaining binding energy of a double combination section on a dsRNA sequence of all combination comprising complementary nucleotides to a random target mRNA; (b) dividing the binding energy into four sections on the dsRNA sequence of each combination to obtain a difference of the mean binding energy between each section and convert into a score of a relative combination energy pattern; (c) selecting siRNA whose inhibition efficiency to target mRNA is expected to be high by applying the converted score to the dsRNA sequence with other factors that affect the efficiency of siRNA; and (d) inhibiting target mRNA expression using the selected siRNA. As a result, a researcher or an experimenter can analyze patterns of a relative binding energy on base sequences of unknown siRNA without actual experiments to determine whether the siRNA is effective or ineffective rapidly, thereby design and production efficiency of siRNA can be maximized and target mRNA can be effectively inhibited with efficient siRNA to the target mRNA.
摘要:
An electron emission device which can uniformly emit electrons and can be simply manufactured at a reduced cost, and a display apparatus having improved uniform brightness of pixels by using the electron emission device. In addition, a simple method of manufacturing the electron emission device. The electron emission device includes: a first substrate; a cathode electrode and an electron emission unit disposed on the first substrate; a gate electrode electrically insulated from the cathode electrode; an insulating layer disposed between the cathode electrode and the gate electrode to insulate the cathode electrode from the gate electrode; and an electron emission source including carbon nanotubes (CNTs) that contact the cathode electrode, wherein distances between the gate electrode and the tips of the CNTs are uniform.
摘要:
An electron emission source including a carbon-based material coated with metal carbide in the surface coating layer, of which the metal has a negative Gibbs free energy when forming the metal carbide at 1,500 K or lower, a method of preparing electron emission sources, and an electron emission device including the electron emission source. The electron emission source includes a carbon nanotube coated with metal carbide or a carbon nanotube having a metal carbide layer and a metal coating layer, which are sequentially formed thereon. Thus, the electron emission source has long lifespan without deterioration of electron emitting characteristics. The electron emission source can be used to manufacture electron emission devices with improved reliability.
摘要:
Provided is a method and device for low frequency vibration excitation, which may generate a low frequency using a plurality of ultrasonic generators for high frequency. The method generates ultrasonic waves using a plurality of ultrasonic generators attached to a target structure to induce a beat phenomenon, and extract a frequency lower than a frequency of each of the plurality of the ultrasonic generators to measure a property of the target structure, and thereby may be freely applied to a target structure, regardless of a shape of the target structure such as a plate, a curved pipe, and the like, using a relatively small-sized ultrasonic sensor for high frequency, and may excite a specific frequency of an acceleration range, so that the ultrasonic excitation method may be applicable in a relatively poor Signal-to-Noise Ratio (SNR) range.
摘要:
A method and system for measuring structural vibration using curve fitting from a video signal, which can reduce an error in vibration measurement displacement, is provided. A method for measuring structural vibration using curve fitting from a video signal, the method includes the steps of: obtaining a video signal of the object; converting the video signal of the object into a gray video signal; adjusting the brightness of the converted video signal; separating an area to be measured from the brightness-adjusted video signal; selecting an edge area of the object from a video signal of the separated area; removing noises from the edge regions; and performing curve fitting with respect to the noise-removed video signal of the edge area. Accordingly, a displacement error is reduced, so that vibration can be more exactly measured.
摘要:
A method of forming a Carbon NanoTube (CNT) structure and a method of manufacturing a Field Emission Device (FED) using the method of forming a CNT structure includes: forming an electrode on a substrate, forming a buffer layer on the electrode, forming a catalyst layer in a particle shape on the buffer layer, etching the buffer layer exposed through the catalyst layer, and growing CNTs from the catalyst layer formed on the etched buffer layer.