31 results about "Critical length" patented technology

The invention discloses a large-scale composite material wind-power blade which comprises a suction face shell (1), a pressure face shell (2) and a cutting webplate (3) fixedly connected between the two shells, wherein the suction face shell (1) and the pressure face shell (2) are both sandwich type structural parts of an envelope (4) for covering a core material; the core material comprises a main blade bearing beam (5), a flange reinforcement part (6) of the blade and a filling material (7) arranged between the main blade bearing beam (5) and the reinforcement part (6); and the main blade bearing beam (5) and the reinforcement part (6) both use mixtures of carbon fibers/glass fibers as an reinforcement material. The large-scale composite material wind-power blade has the advantages of light weight, extended critical length, excellent mechanical property, and the like.

A method of forming an electrical conductor, comprising forming electrically conductive segments incorporating electromigration-inhibiting plugs. A row of windows is formed in a planar surface and electromigraation-inhibiting material is deposited over the planar surface and into the windows to provide electromigration-inhibiting plugs in the windows. The plugs may be formed by depositing an electromigration-inhibiting liner in the windows and then depositing electrically conductive material to fill the windows. Portions of either or both of the plugs and conductive segments are removed such that the plugs and conductive segments have a coplanar surface. The plugs may be formed in windows in an electrically conductive layer defining the conductive segments. Embodiments of the method may be employed in manufacture of integrated circuit conductor.

The invention discloses a transverse-furrow and sequential-ridge mellow soil anti-corrosion farming method of a purple soil slope farmland and particularly relates to the field of a soil erosion management technique of the purple soil slope farmland. In the method disclosed by the invention, a transverse furrow is excavated along the contour line on the purple soil slope farmland at the slope length interval which is less than the rill erosion generation critical length of the modified slope surface; the cross section of the transverse furrow is in an arc shape; the formed transverse furrow divides the whole slope farmland plot into multiple small farming units in the transverse slope direction; the two ends of the transverse furrow are connected with the original drainage furrows at the two ends of the slope farmland plot; and the integral farming terrain conditions with alternate furrows and ridges are formed by adopting a sequential-slope ridging farming mode, i.e. alternately farming and ridging in the sequential slop direction and reverse slop direction. The method disclosed by the invention can reduce the water and soil loss and prevent and control the soil erosion of the slope farmland, is beneficial to the enhancement of the water content in the soil of the farmland plot in the descending direction of the transverse furrow, improves the drought resistance of crops, maintains the agricultural productivity of the slope farmland and realizes the sustainable utilization of slope farmland water and soil resources.

A wafer comprises a multi-layer structure. The multi-layer structure includes a first device structure neighbouring an area for receiving alignment markers. A plurality of alignment markers extend into the multi-layer structure and are located within the area for receiving alignment markers. The plurality of alignment markers is arranged to prevent propagation of a crack, when occurring, beyond a material-dependent critical length in a part of the multi-layer structure corresponding to the area for receiving the alignment structure. The material-dependent critical length is associated with the part of the multi-layer structure.

The invention discloses a monitoring and testing method, including acquisition of satellite monitoring sensitivity, for an electric-transmission-line mountain fire satellite monitoring system. The monitoring and testing method includes selecting a testing satellite, an open site, a season, weather, time and orbit azimuth angle conditions, preparing a ground monitoring and measuring device, taking firewood as a flaming material, laying a fire ground at the center of the site, recording coordinates of the fire ground, setting fire to the fire ground before satellite transition, observing a quick satellite view in real time and recording time spent by system preprocessing during satellite transition, repeating fire-point judgment after pre-processing, observing whether the satellite can find the test fire ground or not until finding the critical length of the testing satellite finding the fire ground, and squaring the critical length to acquire the sensitivity of the testing satellite. The monitoring and testing method can be used for acquiring sensitivity, distortionless reception range and fire-point judgment threshold of the monitoring system under the conditions such as different weather and territories, thereby having great guiding significance for operation and accuracy improvement of the electric-transmission-line mountain fire monitoring system.

The invention relates to a vehicle navigation method and a vehicle navigation system. When the vehicle navigation system is navigating, a view image in front of a vehicle is determined to be displayed based on a fact that whether the distance between the current position of the vehicle and a crossroad in front of the vehicle is less than a critical length. If the distance between the current position of the vehicle and the crossroad in front of the vehicle is less than the critical length, the view image in the front is displayed by the navigation system, and a navigation mark is indicated on the front view image based on the map information used by the system and the navigation path determined by the information, thereby accurately guiding a driver to drive on the navigation path.

The invention discloses a main bearing beam for a large wind power blade. The main bearing beam is a carbon fiber/glass fiber mixed composite material round bar sectional material combined body, and the combined body is formed through beam bunching and sizing of a plurality of carbon fiber/glass fiber mixed composite material round bar sectional materials via glass fiber felt or yarn. According tothe main bearing beam for the large wind power blade, the combined body is formed through beam bunching of the carbon fiber/glass fiber mixed composite material round bar sectional materials, complementation of carbon fiber performance and glass fiber performance is sufficiently utilized, the beneficial effects of high elasticity and lightness of carbon fiber are brought into sufficient play, therigidity and strength of the main bearing beam are greatly improved, and the critical length of the main bearing beam is increased; meanwhile, the price is greatly reduced compared with the cost of adoption of pure carbon fiber serving as reinforcing materials, and popularization and application of the carbon fiber to the field of the main bearing beam and the wind power blade are better facilitated. The invention further correspondingly provides a mixed spar composite material wind power blade and a preparing method of the mixed spar composite material wind power blade.

The invention discloses a method for measuring type II crack stress intensity factor threshold value of a metal material. The left end of a test sample is fixed through a test sample fixing mechanism,a horizontal gap extending from the right end face to the center is formed in the right end of the test sample, a triangular crack producing and expanding part with a tip facing towards the right endface is formed in the internal end part of the crack, a V-shaped notch is formed in a vertical edge in the tip position, and a supporting rod is inserted into the gap; stress conducting rods are arranged between an upper clamping part and an upper cantilever as well as a lower clamping part and an lower cantilever of a clamping part; a fatigue test machine applies reciprocating load through an upper column body at the upper part of the upper clamping part; after the test ends up, the test sample is split in perpendicular to the end face, the Type II crack is observed, the stress intensity factor amplitude corresponding to the critical length of the Type II crack is calculated, and the value is the Type II crack stress intensity factor threshold value of the metal material. By the method,production of the crack on the neutral surface is guaranteed, the shear stress is guaranteed to be reduced along with the increment of the length of the crack, and stable expansion of the crack alongthe neutral surface of the test sample is guaranteed.

A data processor compares a length of a pattern to be written into a layer sensitive to a charged particle beam with a critical length equal to the maximum length of a cross section of the charged particle beam or the maximum length of a variable sub-field to see whether or not the pattern is written through a radiation of the maximized cross section or through a radiation onto the maximized sub-field, and a main deflector and a sub-deflector guide a shot of charged particle beam to the layer if the answer is positive so that the pattern is prevented from deformation due to a low stitching accuracy.

A semiconductor device manufacturing method of the this invention having the step of forming an interlayer insulating film on a semiconductor substrate, the step of making interconnection groove in the interlayer insulating film, the step of filling the inside of the interconnection groove with a conductive film which is made of a first substance and is thicker than the depth of the interconnection groove, the step of thermally stabilizing the size of crystal grains in an Al film either at the same time or after the Al film has been formed, the step of forming a Cu film on the Al film, the step of selectively forming .theta. phase layers in a crystal grain boundary of the Al film by causing Cu to selectively diffuse into the crystal grain boundary of Al film and of allowing the .theta. phase layers to divide the Al film in the interconnection groove into fine Al interconnections shorter than the Blech critical length, and the step of removing the Al film and Cu film outside the interconnection groove.

A method and structure for preventing integrated circuit failure due to electromigration and time dependent dielectric breakdown is disclosed. A randomly patterned metal cap layer is selectively formed on the metal interconnect lines (typically copper (Cu)) with an interspace distance between metal cap segments that is less than the critical length (for short-length effects). Since the diffusivity is lower for the Cu/metal cap interface than for the Cu/dielectric cap interface, the region with a metal cap serves as a diffusion barrier.

The invention relates to a hot-rolled strip steel rolling technology for preventing high-speed breaking-away of a roughing mill, and belongs to the technical field of steel rolling processes in the metallurgical industry. According to the technical scheme, the technology is characterized by comprising the following steps of: 1, calculating whether a rough-rolled final plate blank is a short blank with the critical length S=S1-S2+S3+k; 2, determining a tail speed reducing point position of the final plate blank: S4=S2-k-S3; and 3, when the actual length of the rough-rolled final plate blank is smaller than the critical length S and the actual tail position of the final plate blank is equal to the tail speed reducing point position S4 of the final plate blank, or when the actual length of the rough-rolled final plate blank is greater than or equal to the critical length S and the actual head position of the final plate blank is equal to the head speed reducing point position S1 of the final plate blank, reducing the speed of the final plate blank, namely reducing the rolling speed of the final plate blank to the hot coil strip penetrating speed till the tail of the final plate blank is broken away. The technology has the advantages of accurately controlling the speed reducing point position and the speed of the final plate blank of the roughing mill, preventing the breaking-away condition of the roughing mill at a high speed, reducing influence on the roughing mill and equipment connected with the roughing mill, ensuring perfectness of the equipment and ensuring normal production.

The invention relates to two processes of roasting and shaping in a preparation process of a solid phosphoric acid catalyst (SPAC). The catalyst is applied to reactions such as oligomerization of low-carbon olefins and alkylation of propylene. In the past, SPAC preparation, roasting and shaping processes were carried out separately. The static method was used for roasting, and the materials could not be fully and evenly heated; the shredder was used for shaping, resulting in low yield of finished products, high crushing loss, high broken particles and powder, and "memory" inside the particles. crack. The inventor proposed the concept of critical strip length and defined the probability function of particle fracture: ζi=k·(Li‑Lcri)α. During the rotation of the kiln, homogeneous strips fall from the top of the built-in lifting board and hit the bottom. The strip length tends to be the same, and the dual-purpose rotary kiln is designed for roasting and shaping. The obtained SPAC particles have a narrow distribution of length and strength, which improves the conversion rate of the catalytic reaction and the selectivity of oligomers, reduces its muddy tendency, and prolongs the operating life. The particle length of the product of the present invention depends on the effective radius (rbs) of the roasting kiln. The present invention can be implemented industrially.