Showing papers on "Frustum published in 2004"

Sensor with increaseed biocompatibility

Abstract: Sensors and methods for producing them are disclosed. A cavity is created and filled with a reagent that includes a conductive matrix, enzyme, catalyst, and binding agent, in a preferred embodiment. The cavity is substantially enclosed, leaving enough of an opening to allow the sample to enter. A portion of the material surrounding the cavity is preferably permeable to a substance useful for measuring reaction, but not to the reagent or the sample. Cavities that have the shape of a cone, conical frustum, pyramidal frustum, and right circular cylinder are given as examples. Other systems include a membrane that contains the sensor’s active area and defines an internal volume of fluid, where the membrane or internal volume has a particular geometric relationship to the active area.

Analysis and prediction of constriction resistance for contact between rough engineering surfaces

Abstract: The constriction resistance of a semi-infinite cylinder terminating in the frustum of a cone in a gaseous environment is analyzed numerically. The variation of constriction resistance with the ratio of contact radius to cylinder radius, the cone angle, and the gas-to-substrate thermal conductivity ratio is investigated. Nonlinear curve fitting is used to develop a comprehensive predictive correlation for the constriction resistance as a function of these parameters. The parameters are investigated over a wide range of values covering the range expected in practical applications. The correlation could be used in conjunction with an appropriate surface deformation model to predict the thermal contact resistance between rough metallic surfaces.

Trapezoidal shadow maps

Abstract: A method of real-time shadow generation in computer graphical representation of a scene, the method comprising defining an eye's frustum based on a desired view of the scene; defining a location of a light source illuminating at least a portion of the scene; generating a trapezoid to approximate an area, E, within the eye's frustum in the post-perspective space of the light, L; applying a trapezoidal transformation to objects within the trapezoid into a trapezoidal space for computing a shadow map; and determining whether an object or part thereof is in shadow in the desired view of the scene utilising the computed shadow map.

Retroreflection sheeting and film for use in retroreflection sheeting

Abstract: An object of the present invention is to provide a retroreflective sheeting that exhibits proper retroreflection even at a small incident angle with no or less halation, and has superior incident angularities and superior direction characteristics, as well as a film for use in the retroreflective sheeting. The retroreflective sheeting with the above characteristics is obtained by forming reflective elements of a specific triangular pyramidal frustum configuration in a close-packed state on one surface thereof. The shape of the triangular pyramid frustum element satisfies following requirements: one side length of the bottom surface is in the range of 50 to 400 μm, and a difference between a longest side and a shortest side is 200 μm or less; the length of a longest edge is in the range of 50 to 400 μm, and a difference between the longest edge and a shortest edge among the three edges is 100 μm or less; when a vertical line which intersects perpendicularly with the bottom surface is drawn from a top surface to the bottom surface, the length of a longest vertical line is in the range of 20 to 250 μm; and an angle between adjacent side surfaces is in the range of 85 to 95 degrees.

Retroreflection sheet and film used in that retroreflection sheet

Abstract: A retroreflection sheet having a proper retroreflection feature despite a small incident angle without causing halation and being excellent in incident angle characteristics and direction characteristics, and film suitably used in the retroreflection sheet. The retroreflection sheet having the above characteristics can be obtained by a triangular pyramid frustum prism retroreflection sheet in which a triangular pyramid frustum reflection element having a specific shape is disposed on one surface in the most densely filled form. The shape of the triangular pyramid frustum should satisfy such conditions that the length of one side of the bottom surface is 50-400μm, the difference between the longest side and the shortest side up to 200μm, the length of the longest ridge line 30-400μm, the difference between the longest ridge line and the shortest ridge line up to 100μm, the length of the longest one out of perpendiculars drawn from the bottom surface and crossing the top surface 20-250μm, and an angle between side surfaces 85-95°.

Dual scraped, thin film, heat exchanger for viscous fluid

Abstract: An apparatus for thermally effecting high viscous fluids and comprising of a matching set of frustum shaped heat transmitting bodies (1) and (2) having one or more grooves in the surface (7) whereby one or more strands of scapers are pretuding from the grooves (7) and whereby the bodies (1) and (2) have a reciprocally angular movement in relation to each other.

Generating shadow image data of a 3D object

Abstract: The image of at least one 3D object (706) is generated within a compositing space having at least one light source. A viewport (1704) is defined in the space configured with a frustum enclosing the 3D object (706), as well as a matte of the object in relation to the light source within the space. The matte is accumulated in an accumulating shadow texture, the object being rendered in an image frame defined by the frustum including the accumulating shadow texture. Realistic shadows cast from 3D objects in the compositing space can be shown, including combinations of shadows cast by a collection of objects.

Rapid image-display method and system for three-dimensional objects

Abstract: The invention discloses a rapid image-display method and system for three-dimensional objects The method comprises the following steps: dividing the 3D object model into plural open frustum regions; determining the extended front region based on the extended positive half space and open frustum region; when the intersection set between the view point and the extended front region of polygon is not an null set, taking the polygon is as a front-facing polygon for the view point; under the dynamic environment, converting the view point into the local coordinate of the object through a geometric conversion way, so as to obtain a front-facing section by using the intersection set of the extended front region; and gradually updating the bit string in the open frustum region to maintain the effectiveness and efficiency of the algorithm

Packaging container for confectionery

Abstract: PROBLEM TO BE SOLVED: To provide a packaging container for confectionery or the like in which the stored confectionery or the like hardly produces a deformation and cream or the like of the confectionery is scarcely adhered to the packaging material and its outer appearance is hardly deteriorated. SOLUTION: A sheet material such as paper or the like is formed into a box of an inverted frustum square pyramid. Foldable tongue pieces 8a, 8b that can be folded down to cover an upper opening part 5 are formed at a pair of opposing wall portions 4c, 4d in the wall portions 4a to 4d at locations where they become upper edges under their raised-up state. Protrusions 9a, 9b are formed at both ends of these tongue pieces 8a, 8b in their width direction so as to extend over the upper edges of the adjoining wall portions 4a, 4b and slightly protrude outward. Folded-down surfaces of these protrusions 9a, 9b are abutted against the upper edges of the wall portions 4a, 4b and ride on them. Due to this arrangement, even if the containers are transported or displayed at a store and the like while being stacked up, there occurs no possibility that any external force is applied to the stored confectionery 2 to cause itself to be crushed or deformed or the stored content in the confectionery 2 such as cream or the like is adhered to the packaging material 6 to deteriorate its outer appearance. COPYRIGHT: (C)2004,JPO&NCIPI

Fluidized bed polymerization reaction equipment

Abstract: The utility model discloses a fluidized bed polymerization device, consists of an expansion section on the upper end of the reaction device, a straight tube reaction section of the reaction device, a gas distributor, an air mixing chamber, the air mixing chamber is arranged with one or a plurality of gas flame deflector, the flame deflector comprises an annular plate, the inner ring of the annular plate is provided with a hollow inverted annular frustum, the center of the annular plate is arranged with a central firing pin, and is fixed by ribbed slabs of the hollow inverted annular frustum. The utility model has advantages that: 1) after the annular material enters the mixing chamber, the liquid phase material and the powders are uniformly distributed in the gas phase, the impact force which is made by the airflow in a central hole directly to a distribution plate is reduced, the entrained massive polymers are uneasy to enter distribution holes; 2) the utility model can safely and stably operated when the liquid content in the annular material ranges between 3% to 35% (wt), the space-time yield of the reaction device can be further improved to 250% of the original design value, the continuous operating period of the reaction device can be improved to more than twice of the original period, the adjusting time of the reaction device is reduced to 1/3 of the original time.

Noninsulated type semiconductor device

Abstract: PROBLEM TO BE SOLVED: To provide a noninsulated type semiconductor device capable of easily fixing an external electrode member to a base plate. SOLUTION: When fixing the external electrode member 4 to the base plate 1, by inserting a conical screw 5 into a first through-hole 7 of the base plate 1 from the back side of the plate 1, the head of the screw 5 is fitted to a frustum part of the through-hole 7. Further, screwing down the tip of the screw 5 with a nut 6 after inserting the tip of the screw 5 into a second through-hole 8 of the member 4 fixes the member 4 on the surface of the plate 1. At this time, the head of the screw 5 is fit to the frustum part formed at the lower part of the through-hole 7 of the plate 1. COPYRIGHT: (C)2005,JPO&NCIPI

Heat sink with EMI prevention function

Abstract: A heat dissipating plate with the function of anti-EMI has a plurality of heat dissipating holes which are orderly arranged into a heat dissipating hole array. The exterior margin of each heat dissipating hole extends to one side of the heat dissipating plate, thus forming a convex part. The convex part is a frustum structure formed by the outward impacting of the heat dissipating plate. The technic proposal can facilitate the heat dissipating plate to realize the two functions of heat dissipating and anti-EMI at the same time.

Permanent magnet device for low-voltage electrical apparatus

Abstract: The invention discloses a permanent magnetic device for low-voltage electrical apparatus characterized by that, a through bore is arranged on the permanent magnet, the upper shape of the bore is frustum, and the lower shape of the bore is column. The permanent magnetic bore according the invention is not equivalent to the mere column or frustum shape bore of the ring form permanent magnetic in that, the wall of the latter has magnetic attracting force, while the wall portion of the former has no or smaller magnetic attracting force.

Study on RF Plasma Modeling Between Unequal-Sized Electrodes Using One-dimensional Fluid Method

Abstract: In computational study on RF(Radio Frequency) plasmas, a 1D fluid models with an advantage of a short computational time are often adopted. However, in order to obtain realistic calculation results under a typical chamber geometry with unequal-sized electrodes, modeling of the plasma space is an issue to be investigated. In this paper, it is focused on that how much a 1D model can approximate a 2D model. 1D fluid models with unequal-sized electrodes, which have spherical and frustum geometry systems, were developed and their results were compared with those of 2D model with Gaseous Electronic Conference cell structure. Behavior of RF plasmas has been simulated using 1D and 2D fluid models and a technique to take account of unequal-sized electrodes in a 1D fluid models has been examined. Features of the plasma density and the electric potential were discussed as characteristic quantities representing the asymmetry of the chamber geometry.

Conical package and its securing construction, securing method and connection construction

Abstract: The invention discloses a cone portion, a flange portion and female thread, wherein the outboard surface of the cone portion has a cone frustum shape, the flange portion is formed on the cone portionopposite the expanding side of the cone frustum, and includes a vertical plane surface in respect to the axial direction of the conical shape portion, the female thread is the extension portion of the axial extension along the conical shape portion, the connecting piece forming the screwed joint structure is achieved by inserting the conical plug-in board into the holes when processing hole conical portion and the hole step portion simultaneously.