39results about How to "Avoid stress failure" patented technology

A heat resistant positive-working photosensitive PBO precursor composition comprising:(a) at least one polybenzoxazole precursor polymer;(a) at least one plasticizer compound;(b) at least one solvent;wherein the amount of the plasticizer present in the composition is an amount effective to reduce the sidewall angle of imaged and cured features in the coated film on the substrate to prevent stress failures in subsequent metallization of the substrate due to steep angles of the imaged features, and with the proviso that if the polybenzoxazole precursor polymer solely consists of polybenzoxazole precursor polymers that do not contain a photoactive moiety on the polymer, then(c) at least one photoactive compound is also present in the composition.

The invention discloses a tool framework for engine radiator tanks. The tool framework comprises a fixing bracket. Two first beams, two second beams and two third beams of the fixing bracket are fixed to the two ends respectively, stop bars are fixed between the first beams and the second beams side by side, and movable clamping plates are fixed to the second beams side by side. First supports are fixed to one side of one third beam side by side, second supports are fixed to one side of the other third beam side by side, and the first supports are opposite to the second supports in position. According to the tool framework, one radiator tank is fixed through one pair of fixed supports and one pair of movable clamping blocks, the radiator tanks are stored and transported by fixing several pairs of fixed supports and several pairs of movable clamping blocks to the framework side by side, and stress damage to the structures of the radiator tanks in storage and transport is avoided.

The invention discloses a butt strap structure construction method for bridgehead bumping. The butt strap structure construction method is characterized by comprising the following construction stepsof: (1) constructing cement mixing piles; (2) excavating a surface soil body of the concrete butt strap part; (3) implanting longitudinal drainage plates and water stop plates into the soil body; (4)paving a sandstone cushion layer at the part where transverse drainage plates is placed, and tamping the sandstone cushion layer; (5) inserting the transverse drainage plates into the grooves of the longitudinal drainage plates and the water stop plates; (6) drilling a water pumping holes in the left sides of the longitudinal drainage plates; (7) communicating the steel bars buried in the longitudinal drainage plates with a cathode of a power source, meanwhile, communicating the steel bars buried in the water stop plates with an anode of the power source, and pumping water synchronously through water pumping holes; (8) laying light filler on the transverse drainage plates, and arranging geotechnical cloth on the light filler; (9) inserting a dowel bar into the groove of a pavement slab; and (10) filling the deformation joint with hemp threads, and then laying a steel cover plate at the top of the deformation joint.

The invention provides a semiconductor ignition bridge with a composite self-heating reflective layer for energy gathering, which is formed by stacking a base layer, an insulating layer, a reflective layer, a semiconductor bridge layer, a discrete solder layer and a discrete electrode layer sequentially from bottom to top; rectangular Semiconductor silicon constitutes the base layer; silicon dioxide with the same size as the base layer forms an insulating layer, and the insulating layer covers the base layer; the reflective layer is made of monocrystalline silicon doped with concentrated boron (or phosphorus), and the size is the same as that of the base layer , deposited on the insulating layer; the semiconductor bridge layer is composed of concentrated boron (or phosphorus) implanted polysilicon, and the shape is wide at both ends and narrow in the middle; the two ends of the semiconductor bridge layer are coated with solder layers; then the electrode layer is directly bonded at high temperature on the solder layer. The invention has the functions of high electric energy utilization rate, large ignition output and good ignition promptness.

The present invention discloses surface bionic protection method of stone material and lithical cultural relic. The protection method includes cleaning the surface with detergent comprising deionized water or organic solvent, treating the surface with biological amphibpatic functional pre-treating liquid, and crystallizing supersaturated calcium oxalate solution on the surface to form fine and compact surface protecting calcium oxalate film. The present invention has the advantages of wide applicable range, excellent compatibility to stone material, high weather resistance, raised corrosion resistance, improved hydrophobicity, firm combination with base stone material and no influence on the outer appearance, color and hand feeling of original stone material.

The invention provides an automatic urine catheterization device for pressure measurement. The automatic urine catheterization device comprises a urine catheter connector, a Y-shaped tee joint, a urination connector, a pressure measurement connector, a pressure measurement device, and a plurality of sections of pipes for connecting the urine catheter connector, the Y-shaped tee joint, the urination connector, the pressure measurement connector and the pressure measurement device. The automatic urine catheterization device is characterized in that a one-way valve is arranged in the urine catheter connector, a first control valve, a second control valve and an electromagnetic valve are arranged on near Y-shaped tee joint, the pressure measurement connector is internally provided with a hydrophobic membrane allowing gas to pass through and preventing tissue liquid to pass through, and a liquid measurement device is arranged on the lower end of the pressure measurement connector. The automatic urine catheterization device has the advantages that the urine catheterization device is matched with a urine catheter commonly used clinically, so that the automatic control on urination is realized, and the trouble of artificial nursing on urination is avoided; the one-way valve can effectively prevent the back flowing of urine, so that the urinary tract infection caused by the back flowing of urine is avoided; and the hydrophobic membrane can effectively prevent the urine from flowing back to a pressure sensor.

The invention discloses a propeller power meter for a cavitation tunnel and relates to the field of a propeller hydrodynamic measuring device. A transmission system of the power meter is fixed on a cylinder body by a single-arm support frame and a double-arm support frame. An input shaft is in a thrust bearing set and is connected to the transmission system through a coupling. The thrust bearing set is connected to an opening cylinder section which is threadingly connected to a shaft sleeve of the transmission system. Two ends of a thrust torque sensor are connected to the input shaft and a paddle shaft, a signal input line of the thrust torque sensor passes through a hollow portion of the input shaft, is transferred through a slip ring, then goes out of the sealing ring and is connected to a signal output line in a watertight junction box. An end of the paddle shaft is supported by a water-lubricated bearing in a sealing sleeve. A contraction section is connected to a thrust bearing set and an end sealing sleeve through threads. The space where the thrust torque sensor is located is watertight and communicates with the atmosphere. The effects of small interference to a flow fieldand convenient disassembly and assembly of the paddle shaft are achieved.

The invention provides a process for making a biomimetic composite functional structure by using diatomite acid etching, including diatomite deep purification treatment, diatomite hydrofluoric acid pre-etching at room temperature, diatomite hydrofluoric acid ultrasonic heating acid Etching, diatomaceous earth hydrofluoric acid vacuum pressureless hot acid etching, polyvinyl alcohol atomization infiltration to strengthen the structure and other processes. Compared with the existing technology, the application of polyvinyl alcohol atomization and infiltration process plays a role in strengthening the bonding of diatomite particles that are partially bonded or in a discrete state after acid etching, which is beneficial to the bionic composite functional structure system The improvement of the overall mechanical strength of the finished product further promotes its practical effect and expected life; the external pressure does not always act on the whole process of the acid etching reaction, which avoids the stress damage to the bonding process between the diatom shells in the later stage of the reaction.

The invention relates to a steel structure connecting device which is easy to assemble and disassemble. It includes a metal plug-in board, the left and right side panels of the metal plug-in boards arranged at intervals for welding, and a "T"-shaped connecting board, and the bottom plate connection of the "T"-shaped connecting board is fixed on the left side Between the panel and the right panel, the protruding part of the middle plate of the "T"-shaped connecting plate protruding from the left and right panels is vertically inserted into the middle plate of the "mountain"-shaped frame, and in the "T" shape There are two horizontal slots on the protruding part of the connecting plate for bolt sliding connection, and a cover plate is welded on the top of the "mountain"-shaped frame, and there are two corresponding to the horizontal slots on the cover plate. Transverse slot 2, the screw rods of the two bolts are inserted through the horizontal slot 2 and the horizontal slot 1 in turn, and then slide forward to be in place and locked by nuts. After adopting the structure of the present invention, the front and rear steel crossbeams are butted through the front metal column hanger and the "mountain" shaped frame.