257 results about "Minor axis" patented technology

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 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 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.

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 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.

To provide a technology capable of enhancing heat conductivity of the whole adhesive member while maintaining flexibility, in the adhesive member.SOLUTION: A holding member comprises a first member, a second member, and an adhesive member for bonding the first and second members together. The adhesive member contains a filler. The filler contains a spherical filler and an amorphous filler. An average diameter of the spherical filler is smaller than a maximum value of a minor axis of the amorphous filler.SELECTED DRAWING: Figure 1

To address the issues of insufficient performance and high cost associated with integral casting and additive manufacturing methods for parts with small-entry elliptical gradient deep cavities, and the difficulties, low efficiency, and high cost of metal removal methods, this invention proposes a machining method for elliptical gradient deep cavities with small entry points. The method involves first rough drilling and rough turning to obtain a deep hole. Then, a step-by-step machining approach is adopted, dividing the part into regions and machining them axially and radially. First, the part is tilted to machine the regions on both sides of the major axis of the ellipse. Then, the part is turned upright to machine the regions on both sides of the minor axis of the ellipse. During the upright machining, a radial layering and thin-cutting fast-running method is used. Several layers are machined using the first toolpath until the machining residue in the undercut and triangular regions is removed. Then, a second toolpath is used for contour machining to obtain a gradient deep cavity with an elliptical cross-section. Finally, the gradient deep cavity is precision milled until its internal dimensions and surface roughness meet the design requirements.

A steel sheet according to the present disclosure which has the chemical composition described in the description, wherein: the bainite area ratio is 70% or more, the aspect ratio As of crystal grains HAGB is 4.00 or more, and the maximum value HVmax of the Vickers hardness is 240HV or less in a surface layer region extending from the surface of the steel sheet to a depth of 0.5mm; the bainite area ratio is 50% or more and the minor axis of bainite crystal grains HAGB is 30.0μm or less in a t / 4 region; and the aspect ratio As of the crystal grains HAGB in the surface layer region and the aspect ratio At / 4 of the crystal grains HAGB in the t / 4 region satisfy formula (1).　(1): 1.00≤As / At / 4≤5.00

In the present invention, provided is a steel sheet having a predetermined chemical composition and a metallographic structure, in which A / B, which is a ratio of a length A of an interface between epitaxial ferrite and ferrite to a length B of an interface between the epitaxial ferrite and martensite in a cross section that is along a rolling direction and perpendicular to a surface of the steel sheet at a position of ¼ of a sheet thickness from the surface of the steel sheet is more than 1.5, a ratio of a major axis to a minor axis of the martensite is 5.0 or more, and a tensile strength is 980 MPa or more.

This invention relates to the field of shipbuilding technology and discloses a method for lofting and unfolding a sloping cylindrical structure, comprising the following steps: S1, creating a side view and a normal section view; S2, obtaining the minor axis projection line HV in the side view; S3, obtaining the minor axis section projection line H1V1 and the major axis section projection line P1W1 in the normal section view; S4, obtaining the major axis projection line PW in the side view; S5, drawing perpendicular lines from points P and W to the center line of the cylinder to obtain line segment QT; S6, dividing the normal section view into equal parts, projecting each division point onto line segment QT to obtain equal division projection points, and unfolding the sloping contour to obtain unfolding points; S8, repeating S7, smoothly connecting each unfolding point; S9, obtaining the generatrix unfolding points, connecting two generatrix unfolding points to complete the lofting and unfolding diagram of the sloping cylindrical structure. Using the minor axis projection line and the major axis projection line as a reference, the lofting and unfolding of the cylinder is achieved, realizing accurate lofting and unfolding of any sloping cylindrical structure, facilitating cylinder installation.

The invention discloses a light guide glass calendering roller and a preparation method and application thereof, and relates to the technical field of calendering rollers, the surface of a roller body of the light guide glass calendering roller is provided with a plurality of groups of convex columns which are distributed in parallel and have semi-elliptical sections, the length ratio of the long axis to the short axis of the semi-ellipse is 1: (10-20), and the distance between every two adjacent convex columns is smaller than or equal to 5 microns. Due to the design of the convex columns on the surface of the roller body, lines corresponding to the distribution state of the convex columns can be pressed on the surface of the light guide glass when the light guide glass is rolled, so that the light guide performance of the light guide glass is improved; meanwhile, the Co-Cr alloy plating layer is arranged outside the roller body, so that in the actual production process, when the calendering roller rotates, the roller is often damaged due to the impact of molten foreign matters in molten glass; the addition of cobalt in the Co-Cr alloy coating can form a finer and more uniform co-deposition structure, reduce brittle phases, improve the energy absorption capability of the Co-Cr alloy coating under dynamic load, and further improve the impact resistance of the calendering roller.

To provide a microstrip antenna that can improve the efficiency of energy conversion from an electric signal to a radio wave.SOLUTION: A microstrip antenna includes a radiating element. The radiating element has a first radiating region having a first major axis parallel to a first direction and a first minor axis perpendicular to the first major axis, and a second radiating region having a second major axis parallel to the first direction and longer than the first major axis, and a second minor axis perpendicular to the second major axis. The length of the second minor axis is shorter than the length of the first minor axis.SELECTED DRAWING: Figure 1

The present invention relates to a metal powder containing a metal of Au, Ag, Cu, or an alloy thereof, having an average particle size of 0.1 μm or more and 0.4 μm or less, and purity of 99.9% by mass or more. In this metal powder, a presence ratio, in terms of the number of particles, of non-spherical particles in the metal powder having a ratio (b / a) of a minor axis “a” and a major axis “b” of 3 or more is 1% or less. As a method for producing such a metal powder, in a wet reduction method including a metal colloid synthesis step and a metal powder granulation step of granulating metal colloidal particles into a metal powder, surfactants having alkyl groups having carbon numbers falling within specified ranges are preferably used as first and second dispersants in the metal colloid synthesis step and the metal powder granulation step.