76 results about "Minimum density" patented technology

A light guide plate having a pattern to minimize generation of a dark zone and a backlight unit including the same are disclosed. The light guide plate includes an intaglio pattern consisting of recesses formed in a surface opposite to a light emitting surface thereof to have a cross section having major-axis and minor-axis diameters and depth, the recesses being spaced apart from one another in first and second directions by first and second distances respectively. The density of the intaglio pattern is directly proportional to the major-axis and minor-axis diameters and depth, and is inversely proportional to the first and second distances. The intaglio pattern has the minimum density in a first region adjacent to a light source, and the maximum density in a second region that is the maximum distance from the light source. A density ratio of the maximum density to the minimum density is 900.

The invention discloses a method for preparing a fiber base material and silicon dioxide aerogel composite heat insulating sleeve, and belongs to the technical field of materials. The method comprises the following steps: preparing wet gel from polyethoxydisiloxanes, water, a solvent and a catalysts serving as raw materials; and pouring the wet gel into a sleeve die in which a fiber base materialis laid evenly in advance, ageing, putting into an autoclave for drying heat treatment, and reducing temperature and releasing pressure to obtain the fiber base material and silicon dioxide aerogel composite heat insulating sleeve. The method has the advantages of reasonable design and simple operation; the obtained composite heat insulating sleeve has the advantages that: 1, the minimum thickness of the wall of the sleeve is only 0.5mm, the pressive strength can reach over 1MPa, and special dimensions or other special products can be manufactured by a similar process; 2, the minimum density can reach 100kg/m3, and the minimum heat conductivity is only 0.015w/m.k; and 3, the sleeve can resist maximum temperature of 800 DEG C. The sleeve is particularly suitable for the field of aviation with special requirements on heat insulating properties.

Techniques are provided for optimizing the pattern density in the circuit layout design of a circuit layer. A layer in circuit design is analyzed to define fill regions that can be filled with fill polygons A pattern of fill polygons also is generated, to fill the fill regions. The layout design for the layer then is divided into separate areas or “windows,” and a target density for each window is determined. More particularly, each window is analyzed to determine a target density for the window that will satisfy specified density constraint values, such as a minimum density constraint, a maximum density constraint, or a maximum density gradient constraint. In some implementations, the target density will be the smallest density that will comply with each of the specified density value constraints. Once the target density for the window has been determined, the fill polygons required to most closely approach this target density are selected and added to the circuit layout design. With some implementations, this process may be repeated for fill polygons of different sizes or shapes.

An image processing apparatus includes a maximum/minimum density detecting unit which detects a center pixel of a matrix of N×N pixels in image data that has a maximum or minimum density. A determination unit determines whether the absolute value of a difference between an average of densities of diagonal pixels of the matrix and a density of the center pixel is larger than a threshold value. A peak pixel detecting unit detects peak pixels of the matrix, each peak pixel being the center pixel having a maximum or minimum density, and the absolute value of the difference with respect to the center pixel being larger than the threshold value. A dot region detecting unit detects one of neighboring pixels of the matrix as being a dot region based on the number of the peak pixels in a target region and the number of the peak pixels in each of neighboring regions.

The invention provides a heat-resistant magnesium alloy, and the compositions in mass percentage of the alloy are: more than or equal to 3 percent and less than or equal to 7 percent of Al, more than or equal to 0.5 percent and less than or equal to 7 percent of Zn more than or equal to 0.5 percent and less than or equal to 2 percent of Ti, more than or equal to 1 percent and less than or equal to 6 percent of Sn, more than or equal to 0.01 percent and less than or equal to 0.1 percent of La, more than or equal to 0.5 percent and less than or equal to 4 percent of Si and more than or equal to 0.05 percent and less than or equal to 0.6 percent of Zr and the balance being manganese. The heat-resistant magnesium alloy uses only such normal non-precious rare elements as Al, Zn, Ti, Sn, La, Si and Zr, has low cost and keeps good heat-resistant property without adding the elements; and the plastic deformation rate of the alloy is 0.2 to 0.35 percent at the temperature of 250 DEG C and under the stress of 30Mpa, and the alloy can be widely applied in the working environment of high temperature. The heat-resistant magnesium-based porous composite material consists of heat-resistant magnesium alloy and a minimum-density heat-resistant inorganic porous material, has heat-resistant function and good damping property below the temperature of 250 DEG C, can be widely applied to the heat-resistant vibration-absorption parts and components of rapid machinery like an automobile, and has the advantages of good vibration-absorption, sound insulation and voice confusion. The composite material is simple in preparation process and low in production cost.

An image processing apparatus includes: an acceptance section; an edge detection section; and a screen processing section, wherein the edge detection section includes: a first edge determination section that subjects a pixel of interest to edge determination by reference to information about a density of the pixel of interest and information about densities of pixels around the pixel of interest determined by an edge detection window; and a second edge determination section that compares minimum density information among the information about densities of pixels determined by the edge detection window with a predetermined background threshold value, and that redetermines the pixel of interest, which is determined to belong to an edge portion by the first edge determination section, as belonging to anon-edge portion in cases where the minimum density is equal to or greater than the background threshold value.

Areas, allowed to overlap, are set for respective pixels in an image, and a maximum density value and a minimum density value, among inherent density values of the pixels in each area, are extracted and specified as maximum and minimum density values common to the pixels in the area. Among the density values specified from the overlapping areas, the largest minimum density value is set as a local minimum value and the smallest maximum density value is set as a local maximum value to thereby generate a minimum density plane and a maximum density plane including the pixels having the values. The density values of the pixels at the corresponding positions in the minimum density plane and the maximum density plane are corresponded to the common minimum and maximum values set separately, to thereby linearly convert the whole. Thereby, the pixel density values of the original image are linearly converted simultaneously.

The present invention relates to a method for manufacturing a tool part for an injection molding process, a hot embossing process, nano-imprint process or an extrusion process. First, there is provided a master structure (10) with a surface area comprising nanometre-sized protrusions (11) with a minimum density of approximately 105 protrusions/mm2, the protrusions being positioned in a non-periodic, irregular pattern, said protrusions being created by a process comprising alternating passivation and etching into the master structure. Secondly, there is made a transfer of the master structure into a metal insert (20), the metal insert having a corresponding nanometre-sized pattern (21) from said protrusions, and thirdly, adapting the metal insert into a tool part (30) for enabling nanometre-sized patterns being formed by the tool part. The invention provides an easier and faster way of manufacturing the master structure, e.g. a black silicon wafer. It is a further advantage of the present invention that it provides an advant ageous way of making tools capable of producing self-cleaning surfaces without the need for chemical coating.

The invention discloses a method for amplifying mesenchymal stem cells of a human umbilical cord and a human placenta in vitro. The method comprises the following steps of: using human umbilical cord and placenta as a cell source; digesting tissues by using II type collagenase, centrifuging the product the digestion; removing supernate in the product of the centrifugation; washing the remaining product of the centrifugation by using D-Hank's liquid for three times to obtain single cell suspension; inoculating the single cell suspension in a culture plate or a culture flask; fully replacing the liquid when cell (P0) are adhered after 24 to 72 hours; when 80 to 90 percent of cells are mixed, performing subculture once (P1); inoculating the cells in a roller bottle according to a minimum density of 1,400 cells per cubic centimeter; comparing the growing status, cell amplification time and colony-forming capability of the mesenchymal stem cells between different culture systems to obtain an efficient and stable amplification culture system; and amplifying the mesenchymal stem cells in a large scale in the roller bottle by using the optimal amplification system.

The present invention provides an image forming apparatus that adjusts the amount of light of a light-emitting unit with high accuracy and suppresses an increase in control time that is required to adjust the amount of light, a scanning optical apparatus, and control methods thereof. To accomplish this, the image forming apparatus of the present invention derives a threshold current and a bias current of the light-emitting unit. Further, the image forming apparatus of the present invention supplies the bias current to the light-emitting unit when causing the light-emitting unit to emit light in an amount of light corresponding to the minimum density level, and supplies a current that is larger than the threshold current to the light-emitting unit when causing the light-emitting unit to emit light in an amount of light corresponding to a density level that is larger than that minimum density level.

The invention discloses a preparation method of a chlorinated polyethylene/polyvinyl chloride composite foaming material, which belongs to the technical field of foaming material preparation. In the present invention, polyvinyl chloride absorbs dioctyl phthalate and swells to make it soft and elastic, and then blends it with crosslinking agent dicumyl oxide and stearyl acrylate, and adds nucleating agents calcium carbonate, chlorine The chlorinated polyethylene/polyvinyl chloride masterbatch is obtained by cooling and discharging the chlorinated polyethylene/polyvinyl chloride masterbatch. The chlorinated polyethylene/polyvinyl chloride masterbatch is heated and formed in a mold, and then the non-polluting supercritical carbon dioxide is used as a physical foam agent, increase the expansion ratio, and generate uniform and fine cells, thereby obtaining the method of chlorinated polyethylene/polyvinyl chloride composite foam material. Examples prove that the reaction of the preparation process of the present invention is mild, and while maintaining the advantages of low cost and high flame retardancy, the density of the prepared chlorinated polyethylene/polyvinyl chloride composite foam material is the smallest, the cell distribution is uniform, and the strength is also high. has been significantly improved.