286 results about "Minor axis" patented technology

A gemstone includes a crown, a pavilion, and a girdle disposed between the crown and the pavilion. The girdle has an elliptical cross-section with a major axis and a minor axis. The surface of the gemstone is generally divided into a number of groups of interlocking facets disposed at a variety of angles. The groups of facets comprising the surface of the crown generally include star facets, upper intermediate crown facets, lower intermediate crown facets, main crown facets, and upper girdle facets. The upper girdle facets generally abut an upper edge of the girdle. The groups of facets comprising the surface of the pavilion include culet-adjacent facets, candle facets, main pavilion facets, and lower girdle facets. The lower girdle facets generally abut a lower edge of the girdle.

The invention discloses a stride-adjustable elliptical machine, which comprises a pulling part, which comprises a swing rod which is pulled to realize the swing of the pulling part; the treading part comprises a supporting rod with one end hinged to the bottom end of the swing rod and a pedal arranged on the supporting rod; the adjusting part comprises a rotating assembly arranged at the non-end position of the swing rod and an adjusting assembly for adjusting the position of the rotating assembly relative to the swing rod; one end of the connecting rod is rotationally connected with the rotating assembly; the wheel disc is rotationally arranged in the vertical plane, a fixing shaft rotationally connected with the other end of the connecting rod is arranged on the side wall of the wheel disc, a rotating wheel is further arranged on the side wall of the wheel disc, and the other end of the supporting rod is placed above the rotating wheel and abuts against the periphery of the rotating wheel in a relative sliding mode. According to the elliptical machine arranged in the mode, under the condition that the short axis of the track ellipse is not changed, amplitude adjustment of the long axis of the track ellipse, namely adjustment of the stride length of a user, is achieved, the inclination degree of the pedals is not changed, and therefore the comfort degree of the user is improved.

The utility model discloses a thermal field structure for X-cut lithium niobate crystal growth, the X-axis is defined to extend upwards, the thermal field structure comprises a thermal insulation structure and a crucible, both the thermal insulation structure and the crucible are elliptical cylinders with open upper ends and closed lower ends, when the thermal field structure is used, the crucible is placed in the thermal insulation structure, the central axes of the crucible and the thermal insulation structure coincide, and the central axes of the crucible and the thermal insulation structure coincide. The heat preservation structure is provided with a long axis a1 and a short axis b1, the crucible is provided with a long axis a2 and a short axis b2, the long axis of the heat preservation structure and the long axis of the crucible both extend in the Y-axis direction, the short axis of the heat preservation structure and the short axis of the crucible both extend in the Z-axis direction, and the grown lithium niobate crystal is an elliptic cylinder. According to the utility model, the problem that the crystal is easy to crack in the prior art is solved, and the success rate of the growth of the X-axis lithium niobate crystal is improved.

Methods, systems and apparatuses may provide for technology that determines a major axis length of an ellipse in texture space based on a transformation matrix associated with a circle in screen space, inverts the major axis length, determines a product between the inverted major axis length and a determinant of the transformation matrix, and determines a minor axis length based on a modulus of the product between the inverted major axis length and the determinant of the transformation matrix. In one example, the technology selects a level of detail in the texture space based on the major axis length, the minor axis length, a direction of the major axis length, and a direction of the minor axis length.

The invention belongs to the technical field of scanning measurement, particularly relates to a cable outer diameter and ovality measurement method and system based on line laser contour scanning, and aims to solve the technical problem of low measurement precision caused by the fact that an existing algorithm is sensitive to noise, asymmetry of light strips and contour discrete points. The measurement method comprises the following steps: S1, performing anisotropic Gaussian filtering on a pixel according to a local tangential direction of a preliminary center line; s2, calculating a second derivative value and a third derivative value of the sub-pixel center point in the normal direction; s3, performing initial weighted least square ellipse fitting by using the corrected contour point set and the corresponding fitting weight to obtain parameters of an initial ellipse; and S4, based on the lengths of the long axis and the short axis of the fitting ellipse, calculating to obtain the outer diameter and the ellipticity of the cable. According to the measurement method, the interference of abnormal data points introduced by local flaws such as oil stains and scratches on the surface of the cable is eliminated, and the accuracy and the stability of a fitting result are improved.

The present invention provides glass fibers that make it possible to achieve excellent long-term production stability and that, when used in a glass fiber–reinforced resin molded article, can reduce the linear expansion coefficient in the MD direction and thereby reduce anisotropy. Glass fibers according to the present invention include a plurality of glass filaments. Relative to the total mass thereof, the glass fibers include 60.0–69.0 mass% of SiO2, 18.0–26.0 mass% of Al2O3, 8.0–14.0 mass% of MgO, and 0.0–4.9 mass% of CaO, the total SiO2, Al2O3, MgO, and CaO content being at least 95.0 mass%. The glass filaments have a flat cross-sectional shape, the ratio (major axis / minor axis) of the major axis to the minor axis is 1.2–5.5, and the SiO2 content S, the Al2O3 content A, the MgO content M, the CaO content C, and the ratio (major axis / minor axis) D of the major axis to the minor axis satisfy expression (1).　(1) 228.9≤(S / A)×(C+M)2 / D1 / 4≤588.9

The invention provides a polarization selectivity all-dielectric high-saturation structural color metasurface with a maintainable color center. The metasurface sequentially comprises a SiO2 semi-ellipsoid layer, a GaN elliptic cylinder array and a PDMS flexible substrate from top to bottom, wherein the SiO2 semi-ellipsoid layer and the GaN elliptic cylinder array form a periodically arranged double-layer all-dielectric nanostructure unit. Under the condition of x polarization incidence, the structure generates a narrow-band high-reflection structural color in a visible light wave band, the full width at half maximum of a main reflection peak is about 9 nm, the peak reflectivity can reach 99.8% or above, and the reflectivity of a secondary reflection peak on the short wave side is lower than 0.01; and under the y polarization incidence condition orthogonal to the light source, the reflectivity near the corresponding wavelength is lower than 2%, and the light source shows remarkable polarization selectivity. The inventor further finds that when the equivalent radius change of the nano unit causes the reduction of the reflection efficiency, the reflectivity of the main peak can be recovered by adjusting the long-short axis ratio of the GaN elliptic cylinder and the SiO2 semi-ellipsoid, and the central wavelength of the main formant is basically kept unchanged, so that the brightness adjustment is realized on the premise that the color center is basically constant. The structure is suitable for flexible or wearable optical devices, polarization-related structural color display and other applications.

A filter that is self-locking to a filter manifold includes a flange having a major axis and a minor axis in plan view, and that is longer along the major axis than the minor axis. The filter further includes a stopper on the major axis, that can contact a filter manifold when the filter is inserted into the manifold and rotated. The filter can be used with a filter manifold having a slot with an opening having a width greater than the length of the minor axis and smaller than the length along the major axis of the flange, and past the opening, has sufficient width to accommodate the length of the major axis. This arrangement allows the flange to be inserted into the slot in an insertion orientation, but does not permit the flange to pass through the opening of the slot when it is in a locking position.

The invention provides a silicon nitride material and a preparation method thereof, and a structural member, the silicon nitride material comprises a silicon nitride crystal, and the average minor axis grain size of the silicon nitride crystal is less than or equal to 3.5 [mu] m. The silicon nitride material provided by the invention comprises the silicon nitride crystal, the average short-axis grain size of the silicon nitride crystal is smaller than or equal to 3.5 microns, and the grain size is small, so that concentrated stress can be effectively reduced, dislocation slippage can be retarded, defects and discontinuity at a grain boundary can be reduced, a phonon transmission path is optimized, and the service life of the material is prolonged. Therefore, the silicon nitride material has the characteristics of high hardness and high thermal conductivity.

There are provided a pair of breast covers, each breast cover forming a cup shape defining a concave inner surface and a convex outer surface, defining an ovular cross section having a major axis and a minor axis, being symmetric with respect to the major axis and asymmetric with respect to the minor axis. Each cover further comprises a peripheral adhesive layer on the inner surface thereby defining an adhesive-free central portion at an intersection of the axes. Wearing the covers comprises adhering the covers to respective breasts in first orientations generally symmetric with a centre line therebetween for a first type of garment and in second orientations generally symmetric with the centre line therebetween for a second type of garment.

The utility model relates to the field of precision nets, in particular to a net composed of micron-sized silk threads and a manufacturing method and application of the net. The screen comprises an area used for printing, the area is composed of micron-sized silk threads which are staggered in two directions, the diameter of the micron-sized silk threads is 0.1-50 microns, or the long diameter of the micron-sized silk threads is 5-80 microns, or the short diameter of the micron-sized silk threads is 2-30 microns; the silk threads are divided into transverse threads and longitudinal threads, all the transverse threads are located on the same layer, and all the longitudinal threads are located on the other layer different from the layer where the transverse threads are located. The transverse lines are arranged in parallel; the longitudinal lines are arranged in parallel; the transverse line and the longitudinal line are in contact at an angle of 0-90 degrees, and the transverse line and the longitudinal line are fixedly connected at each contact point of the transverse line and the longitudinal line; the silk threads are made of metal. The manufacturing process of the screen is simple, and the requirements of high-precision application scenes (such as silicon wafer silk-screen printing) can be met.

There is discussed a method of picking and placing bulbs, in which bulbs are supplied on a supply surface of a bulbs supply system; the bulbs being identified and picked from the supply surface with a pick-and-place head; wherein the bulbs are reoriented about a minor axis before being placed.

An aluminum nitride powder according to the present invention has an average particle size of 5 to 50 µm and an oxygen content of 0.5 % by mass or less, has polyhedral particles having at least two smooth surfaces 'a' under observation with a scanning electron microscope at 500x magnification, in which for the polyhedral particles with a major axis (L) of 5 µm or more, the average value of the ratio (L / D) of the major axis (L) to the minor axis (D) is within the range of 1 to 1.4. According to the present invention, an aluminum nitride powder having high thermal conductivity when filled in a resin to obtain a resin composition, and good fluidity, can be provided.

The invention discloses a deep hole inner diameter calculation method based on ellipse fitting, belongs to the technical field of size measurement, and solves the problems that the actual contours of some deep holes are not perfect circular holes, the inspection size pays more attention to the minimum value of the inner diameter, and the consistency of the diameter obtained by using circle fitting is not ideal. Comprising the following steps of: 1, scanning the inner wall of a deep hole by using an optical distance measuring sensor to obtain a plurality of pieces of inner hole surface distance data; 2, performing ellipse fitting on the scanning data to obtain a parameter equation of the scanning data; and 3, calculating the short axis length of the ellipse as the inner diameter of the deep hole according to the equation. According to the invention, the inner diameter size of the deep hole can be quickly and accurately calculated, and the consistency of measurement results is effectively improved.

A shank adapter, forming part of a drilling assembly, has a main body extending axially between a first end and a second end, an externally threaded male spigot portion provided at the second end, and a non-threaded shank positioned axially intermediate the main body and the threaded section. A radially projecting shoulder is positioned axially between the main body and the male spigot portion. The shank has a transition section positioned adjacent to the shoulder at the second end having an outside diameter that increases in a direction from the spigot portion to the shoulder. A cross-sectional shape profile of the outer surface of the transition section has a segment of an ellipse having a semi-major axis (a), a semi-minor axis (b) and an exponential factor (n) according to the equation:<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"< / annotation>< / semantics>xa<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"< / annotation>< / semantics>n+<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"< / annotation>< / semantics>yb<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"< / annotation>< / semantics>n=1A ratio of the semi-major to semi-minor axes (a:b) is within the range 2b<a<8b.

The application provides a wafer double-side grinding device and method using a special-shaped grinding wheel. The device comprises: a carrier ring for loading and positioning a wafer; a driving assembly connected with the carrier ring for driving the carrier ring to rotate; a first static pressure plate arranged on one side of the carrier ring, the first static pressure plate being provided with air holes and water holes, the air holes being used for adsorbing and fixing the wafer when the wafer is positioned on the carrier ring; a second static pressure plate arranged on the other side of the carrier ring, the second static pressure plate also being provided with air holes and water holes, the air holes and water holes on the first static pressure plate and the second static pressure plate being used for spraying water and air on the wafer at the same time when the wafer is ground; and two elliptical grinding wheels symmetrically arranged on two sides of the wafer, the two elliptical grinding wheels being used for rotating in different directions to grind the wafer, wherein the minor axis of the elliptical grinding wheel passes through the center of the wafer, and the major axis of the elliptical grinding wheel covers the end face of the wafer. The device can disperse periodic stress and solve the problem of concentric ring lines.

A connector (10) for coupling a tube (12) to a receptacle comprises an end piece (14) formed at the end of the tube (12), which is arranged such that it can be inserted into the receptacle in an assembly position and slid into a latched position. A retaining element surrounds the receptacle and has first and second legs (62) that extend into the receptacle. The legs (62) each have a cross-section with a first minor axis that is smaller than a second major axis. The end piece (14) engages the minor axis of the legs (62) and presses the legs (62) into a spread state, while the end piece (14) slides from the assembly position into the latched position. In the latched position, the legs (62) retract into a relaxed state and are engaged in a groove (13, 50) in the end piece.

To provide a polyacetal resin composition which can achieve further improvement of physical properties such as mechanical strength, creep resistance and low warpage, while using a heteromorphic cross-sectional glass fiber.SOLUTION: A polyacetal resin composition contains, with respect to 100 pts.mass of (A) a polyacetal resin, 1 to 100 pts.mass of (B) a heteromorphic cross-sectional glass fiber, and 0.001 to 2 pts.mass of (C) one or more binding agents selected from a quaternary onium salt compound and a boric acid compound. As (B) the heteromorphic cross-sectional glass fiber, a glass fiber having a flat cross-sectional shape with a ratio (heteromorphic ratio) of a major axis of the cross section to a minor axis of the cross section of 1.2 or more is preferable.SELECTED DRAWING: None

Provided are: a calcium-based carbonic acid compound, the shape of which is controlled so as to have a high aspect ratio; and an inorganic molded body. The present invention provides a calcium-based carbonic acid compound wherein: the content of phosphorus atoms is 1,000-15,000 ppm; the content of sulfur atoms is 2,000 ppm or less; and the aspect ratio of the average major axis to the average minor axis is 6-19.

A phase difference sheet including a substrate and a phase difference film as a tilt film, wherein, in a biaxial refractive index ellipsoid exhibiting a refractive index anisotropy, of three principal refractive indexes nx, ny, nz, the principal refractive index in the length direction of a columnar structure, i.e., the X-axis direction, is nx, the principal refractive index in the major axis direction of an ellipse perpendicular to the X-axis, i.e., the Y-axis direction, is ny, and the principal refractive index in the minor axis direction, i.e., the Z-axis direction, is nz, the following conditional expression (1) is satisfied, and, in a case where the incident angle of a direction tilted to the X-axis side with the normal as a reference is positive, the phase difference of incident light at an incident angle of +30° is Re(+30), the phase difference of incident light at an incident angle of -30° is Re(-30), and the ratio of Re(+30) to Re(-30), i.e., the phase difference ratio, is Re(30) ratio, the following conditional expression (2) is satisfied, ny > nx > nz (1), Re(30) ratio = Re(30) / Re(-30) = 1.1 to 4.0 (2).

A drill string comprising: an elongate hollow main length section (101); a male casing portion (108) provided at a second end (106), the male casing portion having an externally threaded section (107) and a non-threaded shank (109) axially positioned intermediate the main length section (101) and the threaded section (107); the shank (109) having a transition section (206) positioned adjacent a radially protruding shoulder (110) at the second end (106) or the main length section (101), the transition section (206); wherein a cross-sectional shape profile of an outer surface of the transition section (206) in a plane of a longitudinal axis (204) comprises a segment of an ellipse having a semi-major axis (a), a semi-minor axis (b); wherein a ratio of the semi-major axis to the semi-minor axis (a:b) is within a range 2b

An annuloplasty band having a differentiation in area moment of inertia, where the area moment of inertia in the out of plane direction is much less than the area moment of inertia in the plane of the annulus. This makes the band stiff enough to hold the annulus in the correct shape while being flexible enough out of plane to minimize the risk of suture dehiscence or breakage. One example is a C-shaped band with a core formed of nitinol and having a constant cross-section with a wider radial dimension than an axial dimension. The cross-section may be rectangular. The band is asymmetric across a minor axis with one end extending around the anterior side farther than the other. The free ends rise up from adjacent lateral sides, and a continuous posterior mid-section also rises upward.

The present invention discloses a method for forming an elliptical concave-convex electrode plate for a large-scale water electrolysis hydrogen production electrolyzer. The outer contour of the electrode plate is an ellipse, and the minor axis of the ellipse is along the width direction of the rolled slab. The maximum minor axis length can be close to the maximum width of the rolled slab, and the major axis of the ellipse is along the length direction of the rolled slab, so the major axis length is theoretically not limited by the width of the rolled slab, which solves the problem that the traditional circular electrode plate is limited by the maximum width of the rolled slab and the effective working area of ​​the electrode plate cannot be further increased. The present invention adopts a progressive stamping forming method to solve the technical problems of high mold material cost, high mold processing cost, high mold processing and matching precision requirements, the inability of the overall mold to adapt to the changes of protrusions and pits, and the need for large countertops and large-tonnage special equipment, breaking through the limitations of the electrode plate diameter and effective working area and greatly reducing the production and manufacturing costs of the electrode plate.

The utility model relates to the technical field of medical instruments, and provides an eyeball surface flushing unit and a flusher, the flushing unit comprises a needle seat and a hollow needle tube, the needle tube comprises a flushing end and a connecting end, the connecting end is connected with the needle seat, the cross section of the needle tube is oval or kidney-round, the long axis of the cross section is 1.4-3mm, and the short axis of the cross section is 1.0-2mm. And the end part of the flushing end of the needle tube is blunt and flat. A trumpet-shaped flushing part is arranged at the flushing end of the needle tube, and a flushing opening of the flushing part is oval or kidney-shaped. And the length of the needle tube is 3-5cm. The needle tube has the advantages that the size of the hole of the needle tube is larger than that of a traditional needle tube, water flow is thicker, compared with traditional thin water flow, the impact force of the water flow is smaller, the situation that the water flow is splashed to pollute the full retinoscope and form water drops due to too large impact force of the water flow is avoided, the view of an operator cannot be affected, and smooth operation is guaranteed. In addition, the oval section is combined, water flow is flattened, and the flushing effect is better compared with a circular design.

To provide a grease composition having low torque.SOLUTION: A grease composition comprises a base oil (A) and a thickener (B), wherein when a minor axis and a major axis of the thickener (B) in the grease composition are measured using a dielectric constant observation system of a scanning electron microscope, an aspect ratio (minor axis / major axis) of the thickener (B) is less than 0.23.SELECTED DRAWING: None

The present application discloses an object size measurement method, related devices, an X-ray security inspection machine, and a storage medium. The object size measurement method includes: detecting a first scanned image of an object to be measured on an inspection channel by an X-ray security inspection machine to obtain a detection result, and acquiring device parameters including at least a scaling factor when the X-ray security inspection machine forms an image; obtaining a physical distance between a first intersection point of a first light ray on the inspection channel and a second intersection point of a second light ray on the inspection channel based on the scaling factor and a coordinate difference; establishing a target coordinate system with the center of the target ellipse as the origin, the direction of the major axis of the target ellipse as the horizontal coordinate axis, and the direction of the minor axis of the target ellipse as the vertical coordinate axis; constructing a first equation of the first light ray and a second equation of the second light ray based on the target coordinate system; and solving for a physical radius based on the first equation, the second equation, and the physical distance. The above solution can automatically and accurately measure the physical radius of an object to be measured during the security inspection process.

This invention provides a calcium carbonate compound and an inorganic molded body with shape controlled by having a high aspect ratio. The invention relates to a calcium carbonate compound having a phosphorus content of 1000 ppm or more and 15000 ppm or less, a sulfur content of 2000 ppm or less, and an aspect ratio (mean major axis to mean minor axis) of 6 or more and 19 or less.

An apparatus for generating a defined laser illumination (12) on a work plane (14) has a laser light source (20) that generates a raw laser beam (22). An optical assembly (24) receives the raw laser beam (22) and shapes it into an illumination beam (26) along an optical axis (40). The illumination beam (26) defines a beam direction (28) that intersects the work plane (14). The illumination beam (26) has a beam profile (42; 42') in a region of the work plane (14) that has a major axis (44) perpendicular to the beam direction (28) with a major axis beam width and a minor axis (46) with a minor axis beam width. The optical assembly (24) includes a beam transformer (30) with an exit aperture, a first set of optical elements (56, 60, 62, 64) for beam shaping on the major axis, and a second set of optical elements (34, 36, 38) for beam shaping on the minor axis. The beam transformer (30) widens the raw laser beam (22) on the major axis to generate a widened raw laser beam. The first set of optical elements (56, 60, 62, 64) includes a homogenizer (56) that homogenizes the widened raw laser beam on the major axis. The second set of optical elements (34, 36, 38) includes at least one lens (38) that images the exit aperture of the beam transformer (30) into the work plane. The first set of optical elements (56, 60, 62, 64) generates an intermediate image (66) behind the homogenizer (56) and further implements an imaging optical unit that images the intermediate image (66) into the work plane (14).

An X-ray source is provided comprising a target generator configured to generate a liquid jet having an elongated cross with a major axis and a minor axis; an electron source configured to generate an electron beam arranged to interact with the liquid jet in an interaction region to generate X-ray radiation; and an X-ray transparent window arranged to transmit X-ray radiation generated in the interaction region, wherein the X-ray transparent window is located for extraction of X-ray radiation at an angle α relative to the major axis; wherein the target generator is configured to generate the liquid jet such that said jet has a thickness at the interaction region, along a propagation direction of the electron beam, that is less than an electron penetration depth of the electron beam in the liquid jet. A corresponding method for generating X-ray radiation is also provided.

Provided are a molded article that has excellent flame retardancy, and even though it contains fibers, can exhibit a small amount of deformation caused by flame contact that can be suppressed to a level comparable to that before deformation, and a propylene-based resin composition capable of producing the molded article. A polypropylene-based resin composition contains a polypropylene-based polymer (A), a flame retardant (B), and fibers (C), in which the fibers (C) include a fiber having a flat cross-sectional shape in which a ratio of a major axis to a minor axis [major axis / minor axis] in a cross section is 2.0 or more, and a molded article contains the polypropylene-based resin composition.