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140results about How to "Large margin" patented technology

Broadband mobile communication method and system based on multi-beam GEO satellite

The invention discloses a broadband mobile communication method based on a multi-beam GEO satellite. The broadband mobile communication method based on the multi-beam GEO satellite mainly comprises the steps that spot beams at the Ka frequency band are adopted by NG+1 bidirectional feed links between a satellite-borne device and a ground station device, so that space division multiplexing is achieved for NG+1 times; a cellular network with NB cells is formed through NB bidirectional user links between the satellite-borne device and NT mobile user terminals based on an NB-beam satellite antenna, and space division multiplexing is achieved for NB/4 times with every four cells as a group, so that a 260 MHz bandwidth resource can be shared. The invention further discloses a broadband mobile communication system based on the multi-beam GEO satellite. According to the broadband mobile communication method and system based on the multi-beam GEO satellite, any one of the NT mobile user terminals can serve as an independent multimedia communication terminal as well as a local area network connected with a public Internet and can have access to a remote URL through the satellite links of the system, and an Internet service on the level similar to the 4G mobile communication level can be provided for a large number of people on various vehicles.
Owner:XIDIAN UNIV

Welding method of ultra-thick and high-strength water-power steel

The invention relates to a welding method of ultra-thick and high-strength water-power steel, belonging to the welding field. Welding is realized by adopting a mixed welding mode, i.e. hand welding is adopted as a basis for filling the bottom, and gas shielded welding is adopted for a middle layer and a cover part, multilayer and multi-pass welding are adopted, a carbon arc is cropped out after a single side is filled, and the input of welding heat is controlled within 65 kJ / cm. A welding bevel adopts an asymmetric U-shaped bevel, a thick steel plate of 145-155 mm is preheated to 100 DEG C before welding, the inter-layer temperature is kept between 100 DEG C to 160 DEG C, and heat treatment stress is not carried out after welding, and the problem of reheat embrittlement of a welding joint of the high-strength water-power steel is solved. The invention needs simple welding equipment, realizes welding through a combined welding process on the basis of the traditional equipment, reduces the filling amount of welding metal, and achieves the welding effect of a narrow gap. Compared with the hand arc welding, the invention greatly improves the welding efficiency of the thick steel plate and lowers the possibility of welding defects easily generated on the hand arc welding of an ultra-thick steel plate, such as cold cracks, incomplete fusion, crisp fusion, and the like.
Owner:SHOUGANG CORPORATION +1

Cable protection sleeve and cable assembly

The invention provides a cable protection sleeve and a cable assembly. The cable protection sleeve includes a threading sleeve body, the periphery of the threading sleeve body is provided with a circular groove, at least one of two groove walls of the circular grove is provided with a sealing skirt edge extending towards the other groove wall opposite to the groove wall and used for pressing against a hole edge of a wire outlet hole, an outer circumferential surface or an inner circumferential surface of the sealing skirt edge is a conical surface used for being pushed by the hole edge of the wire outlet hole and clinging to the hole edge through radial slippage elastic deformation and axial compression elastic deformation so as to seal the wire outlet hole, and the conical surface gradually closes or opens in a direction from front to back. In use, radial and axial deformation of the sealing skirt edge on the groove wall of the circular groove occur when the sealing skirt edge is extruded by the hole edge of the wire outlet hole, and enable the sealing skirt edge to have a very large deformation amount, when deformation of the wall groove of the circular grove occurs due to a swing or bending of a cable, the sealing skirt edge does not completely disengage from the hole edge, thereby ensuring that the sealing skirt edge is capable of clinging to the hole edge at all times, and relatively high sealing waterproofness is achieved.
Owner:CHINA AVIATION OPTICAL-ELECTRICAL TECH CO LTD

Steel for nuclear power pressure-bearing equipment and manufacturing method thereof

ActiveCN103160732AGood intensity levelLittle decrease in strengthChemical compositionNon-metallic inclusions
The invention discloses steel used for nuclear power pressure-bearing equipment and a manufacturing method thereof. The steel comprises the following chemical components by weight: 0.12%-0.18% of C; 0.15%-0.35% of Si; 1.20%-1.65% of Mn; less than or equal to 0.015% of P; less than or equal to 0.010% of S, 0.50%-0.85% of Ni; less than or equal to 0.15% of Cr; 0.020%-0.050% of Al; less than or equal to 0.02% of V; less than or equal to 0.02% of Ti, and the balance Fe and unavoidable impurities. At the same time, non-metallic inclusions in the steel are controlled, and A, B, C and D impurities are guaranteed less than or equal to grade 1.5. The manufacturing method mainly includes steel smelting, rolling, as well as quenching and tempering treatment. Through further optimization of the chemical components, a heat treatment process, and reduction of gas and non-metallic inclusions in steel, the method enables the mechanical properties of a steel plate to be maintained at a high level under a heat treatment state, a simulated post-weld heat treatment state, and a 200DEG C high temperature state, so that the steel plate completely meets the technical index requirements. Meanwhile, the 0DEG C impact absorption energy is still maintained at a high level, and good matching of steel plate strength and toughness is reflected, so that the steel provided in the invention is completely suitable for nuclear power pressure-bearing equipment.
Owner:ANGANG STEEL CO LTD

Steel for pressure bearing boundary part of steam generator in nuclear power plant and manufacturing method of steel

The invention discloses steel for a pressure bearing boundary part of a steam generator in a nuclear power plant and a manufacturing method of the steel. The steel comprises 0.15% to 0.22% of C, 0.10%to 0.30% of Si, 0.55% to 0.75% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.30% to 0.60% of Ni, 0.70% to 1.10% of Cr, 0.80% to 1.50% of Mo, 0.020% to 0.040% of Al, 0.010% to 0.030% of Nb, 0.0005% to 0.002% of B, less than or equal to 0.05% of Cu and the balance of Fe and unavoidable impurities. A converter-continuous casting process is adopted when the thicknessof a steel plate is less than 80mm, wherein the heating temperature is 1180-1250 DEG C, the rolling starting temperature is greater than or equal to 1100 DEG C, and the rolling finishing temperature is greater than or equal to 900 DEG C; an electric furnace-die casting process is adopted when the thickness of the steel plate is greater than or equal to 80mm, wherein the heating temperature is greater than or equal to 1200 DEG C, the rolling starting temperature is greater than or equal to 1050 DEG C, and the rolling finishing temperature is greater than or equal to 850 DEG C; quenching and tempering treatment are performed on the steel plate after rolling; and the produced steel plate of 30-150mm has good high temperature performance and strong strength-toughness matching.
Owner:ANGANG STEEL CO LTD

Three-dimensional storage device and method for forming contact hole in step region

PendingCN108899322AReduce the probability of etch punch-throughLarge marginSolid-state devicesSemiconductor devicesEtchingInsulation layer
The invention provides a method for forming a contact hole in a step region of a three-dimensional storage device. The method comprises the following steps of providing a semiconductor structure, wherein the semiconductor structure has a step region, the step region has a plurality of step structures, and each step structure comprises at least one medium layer and at least one conducting layer inalternate stacking from top to bottom; removing a part of conducting layer material from the exposed side wall of at least one conducting layer of each step structure so as to form recessed parts opposite to the adjacent medium layers; covering an insulation layer in the step region; filling each recessed part by the insulation layer; removing the medium layer and the insulation layer on the uppersurface of the step region so as to expose the first conducting layer on the top of each step structure; meanwhile, remaining the insulation layer positioned at each recessed part; forming a second conducting layer on the first conducting layer on the top of each step layer; forming the contact hole on each step structure. The thickness of the conducting layer on the step region is increased, sothat greater allowance can be provided for the etching of the contact hole, so that the contact hole etching penetration probability is reduced.
Owner:YANGTZE MEMORY TECH CO LTD

Corporate aircraft engine upper placement and front swept wing duck type layout

InactiveCN103231795AReduce stallGuaranteed control efficiencyHeat reducing structuresJet aeroplaneAviation
The invention provides a corporate aircraft engine upper placement and front swept wing duck type layout, which belongs to the aviation field, and relates to a high lift drag ratio airplane total layout scheme. The airplane comprises a fuselage, duck wings, wings, a vertical fin, an engine and a rear body edge strip; the wing leading edge inner segment sweeps back; the wing leading edge outer segment sweeps forward, and the engine is supported on an upper surface of a rear body edge strip between a wing trailing edge and an edge strip rudder by an engine, and in the top view projection, an engine axis crosses the corner of the wing leading edge inner segment and the wing leading edge outer segment, and an elevator is arranged at the wing trailing edge, and an inner side elevating auxiliary wing is arranged at the inner side of the wing trailing edge inner side, and an outside elevating auxiliary wing is arranged at the outer side of the wing trailing edge; an edge strip rudder is arranged at the rear edge of the rear body edge strip, and a rudder is arranged at the rear edge of the vertical fin. The wing trailing edge inner segment is connected with a rear body edge strip; the edge strip rudder at the rear body edge strip trailing edge is in cracking type, and is composed of an upper rudder surface and a lower rudder surface, and the shapes of the fuselage and the wing are in smooth transition. The invention has the advantages of high rising and landing lift coefficient and high trim lift drag ratio, light structure weight, long endurance and long voyage.
Owner:AVIC CHENGDU AIRCRAFT DESIGN & RES INST
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