摘要:
[Task to be Solved] One of the principal objects of the invention is to collect minute diamond particles of D50 of 20 nm and smaller, by MICROTRAC UPA 150, in high precision and high definition.[Means for Solving the Task] The minute diamond particles of the invention are recovered by a method comprising: (1) joining or combining a hydrophilic functional group with a surface of diamond powder that comprises particles of a primary particle size of 50 nm or less, so as to impart hydrophilic nature on the surface, (2) placing the hydrophilic diamond particles to hold in suspension in water to form a slurry, (3) subjecting said slurry to a hyper-centrifugal process at a centrifugal force of 4×103 G and at the same time a centrifugal load product of 200×103 G·min. or more, in order to remove by depositing a fraction of coarser particles from the slurry, said load product being defined as product of centrifugal force, loaded, in G and duration of loading in minutes, where G represents the gravitational acceleration constant; (4) adding cations to said slurry, whereby the diamond particles in suspension in the water are deposited.
摘要:
[Task to be Solved]One of the principal objects of the invention is to collect minute diamond particles of D50 of 20 nm and smaller, by MICROTRAC UPA 150, in high precision and high definition.[Means for Solving the Task]The minute diamond particles of the invention are recovered by a method comprising: (1) joining or combining a hydrophilic functional group with a surface of diamond powder that comprises particles of a primary particle size of 50 nm or less, so as to impart hydrophilic nature on the surface, (2) placing the hydrophilic diamond particles to hold in suspension in water to form a slurry, (3) subjecting said slurry to a hyper-centrifugal process at a centrifugal force of 4×103 G and at the same time a centrifugal load product of 200×103 G·min. or more, in order to remove by depositing a fraction of coarser particles from the slurry, said load product being defined as product of centrifugal force, loaded, in G and duration of loading in minutes, where G represents the gravitational acceleration constant; (4) adding cations to said slurry, whereby the diamond particles in suspension in the water are deposited.
摘要:
An object of this invention is to provide a fine powder of diamond particles of less than 50 nm with a narrow particle size range. The diamond is single crystalline and characterized with a lot of sharp edges and sharp points. Another object is to provide a method for efficiently producing such fine powder.The method comprises mechanically crushing a raw material of single crystalline diamond particles to prepare starting minute particles of diamond, then imparting hydrophilic quality to the surface of diamond particles. As hydrophilic the diamond particles are dispersed in water to form a slurry, which is set and kept weakly alkaline. The slurry is then subjected to a preliminary grading step, whereby the slurry is removed of a top particle size fraction of the diamond particles that has a D50 size of 60 nm or more. Eliminated of said top particle size fraction, the slurry is then diluted with water to regulate the diamond concentration to 0.1% (by weight) or less. The slurry so conditioned is subjected to a centrifugal force, whereby a coarser particle size fraction of the diamond particles is condensed to a solid cake and removed from the slurry. Effluent slurry is taken out from the centrifugal grading that contains a fraction of the diamond particles having decreased particle sizes.
摘要:
An object of this invention is to provide a fine powder of diamond particles of less than 50 nm with a narrow particle size range. The diamond is single crystalline and characterized with a lot of sharp edges and sharp points. Another object is to provide a method for efficiently producing such fine powder.The method comprises mechanically crushing a raw material of single crystalline diamond particles to prepare starting minute particles of diamond, then imparting hydrophilic quality to the surface of diamond particles. As hydrophilic the diamond particles are dispersed in water to form a slurry, which is set and kept weakly alkaline. The slurry is then subjected to a preliminary grading step, whereby the slurry is removed of a top particle size fraction of the diamond particles that has a D50 size of 60 nm or more. Eliminated of said top particle size fraction, the slurry is then diluted with water to regulate the diamond concentration to 0.1% (by weight) or less. The slurry so conditioned is subjected to a centrifugal force, whereby a coarser particle size fraction of the diamond particles is condensed to a solid cake and removed from the slurry. Effluent slurry is taken out from the centrifugal grading that contains a fraction of the diamond particles having decreased particle sizes.
摘要:
An image processing apparatus converts an input color signal into a color signal which falls within a color reproduction range of an image output device. The image processing apparatus includes a representative color setting unit that sets plural representative colors, a first hue setting unit that sets hue for an equi-hue line connecting the representative color and black, a hue correcting unit that corrects hue of the input color signal referring to the first hue setting unit, and a mapping unit that maps the input color signal after whose hue is corrected to a color signal within a color range of the image output device.
摘要:
When performing predetermined color correction/modification processing on RGB image data including red, green and blue color components so as to perform hue correction thereon, a frequency distribution of respective tone values is obtained for at least one of these red, green and blue color components of the RGB image data; it is determined from the frequency distribution whether or not the RGB image data has already undergone tone transformation; and the predetermined color correction/modification processing is performed on the RGB image data so as to perform the hue correction thereon only when it is determined that the RGB image data has not undergone tone transformation yet.
摘要:
A color image processing apparatus realizes color reproduction in a color image output apparatus by controlling the total amount of coloring material used while making full use of the color reproduction range of the color image output apparatus. To this end, a signal C′M′Y′K′, obtained after a &ggr; conversion (gamma conversion), is converted into an amount of ink drops V (CMYK) at a conversion unit. Then, at a total ink drop quantity control unit, a total ink quantity of the amount of ink drops converted at the conversion unit and a limit value (maximum total ink drop quantity) stored in a maximum total ink quantity memory unit are compared, and the total ink quantity is controlled to be lower than the limit value. Then, the controlled amount of ink drops is converted into a recording control signal C″M″Y″K″ at a control signal conversion unit.
摘要:
A color matching process which can respond to a type of object to be processed is automatically performed by a printer driver. The color conversion method converts first color image information into second color image information output to a color image outputting apparatus. It is determined whether or not the first color image information includes an instruction for designating a color matching method. A type of each object included in the first color image information is discriminated when the first color image information does not include the instruction for designating a color matching method. One of a plurality of color matching methods suitable for the type of each object is selected in accordance with previously prepared correspondence information between each type of object and each color matching method. A color matching process is performed on each object in the first color image information by using the selected color matching method so as to convert the first color image information into the second color image information.
摘要:
According to an embodiment, a color tone control device includes circuitry. The circuitry is configured to extract, from a master image in which a color patch is added outside a printing image area, a color measurement target area in the printing image area; calculate a color measurement area of the color patch from the master image; and generate a gradation correction parameter for correcting gradation depending on a color tone variation amount that is based on the color measurement area of the color patch and the color measurement target area in the printing image area.
摘要:
A converting unit converts a first color signal into a second color signal and a third color signal. A first correcting unit corrects a magnitude relation between hue angles of the third color signal such that a magnitude relation between hue angles of the second color signal corresponding to the first color signal is maintained in the hue angles of the third color signal. The first color signal is a device-dependent input red, green, blue color signal. The second color signal is a color signal of a hue, lightness, saturation color space. The third color signal is a color signal of CIECAM02 color space.