93results about How to "Extended time period" patented technology

The invention discloses a quantitative risk analysis method of pressure bearing equipment containing surface crack defects. The method comprises the following steps of: 1) carrying out non-destructive inspection on pressure bearing equipment to be analyzed; 2) calculating a stress strength factor KI of the pressure bearing equipment containing surface crack defects; 3) calculating plastic fracture degree Lr of the pressure bearing equipment; 4) calculating fracture failure degree Kr' of the pressure bearing equipment; 5) establishing a failure equation, substituting the Lr value and Kr' value into the equation, and carrying out calculation according to a formula Z=Kr'-(1-0.14Lr2)(0.3+0.7exp(-0.65Lr6); 6) calculating failure probability including surface cracks by using a Monte-Carlo method; and 7) determining a correction factor FD including surface crack defects and calculating failure probability of the pressure bearing equipment. According to the invention, the influences of the surface crack defects on the pressure bearing equipment are taken into consideration, the accuracy of risk analysis result is improved and the the pressure bearing equipment is inspected and maintained in a more target and more reasonable way.

The invention provides a non-initiating unlocking device and a locking and unlocking method thereof, which belongs to the field of unlocking devices. The device comprising a fastening cord, A hot knife assembly and at least two locking release members, the lock release member is used for fixing on the first member and the lock release member is used for fixing on the first member, the fastening cord is for providing a tightening force to the lock release member such that the lock release member locks the second member in a first state, the hot knife assembly comprises a hot knife and a hot knife mounting part, The hot knife mounting part is made of heat insulating material, the hot knife is arranged in the hot knife mounting part, the fastening rope is in close contact with the hot knife,and the hot knife is an electric heating element for generating heat to fuse the fastening rope, so that the locking releasing part returns to the second state and releases the second part. The invention avoids the carbonaceous fragments caused by the radial thrust, and the hot knife and the hot knife mounting part are structured under the space environment, and the performance is stable and the reliability is high.

The present invention relates to an exhaust-gas aftertreatment device for an internal combustion engine, wherein said device (1) comprises a catalytic converter (2), wherein the catalytic converter (2) comprises a tubular member (3) which defines a volume (4) within which a catalytic converter substrate (5) is located, and wherein the volume (4) with the catalytic converter substrate (5) communicates with an inlet portion (6) for receiving exhaust gas emissions from the internal combustion engine and with an outlet portion (7) for discharging said exhaust gas emissions after catalytic conversion thereof in said volume. The device (1) comprises a pipe member (8) within said tubular member (3) of the catalytic converter (2), which pipe member connects the inlet portion (6) with the volume (4) in said tubular member (3) and guides the exhaust gas emissions from said inlet portion in a first direction of flow (A), and said pipe member (8) opens downstream into a deflector means (9) which deflects the exhaust gas emissions into the volume (4) of the tubular member (3) of the catalytic converter (2) in a second direction of flow (B) other than said first direction of flow (A) ( Fig. 1 ).

The invention discloses a quantitative risk analyzing method for pressure equipment with embed crack defect. The quantitative risk analysis method comprises the following steps of: 1, carrying out nondestructive detection on the pressure equipment to be analyzed; 2, calculating a stress strength factor value of the pressure equipment with the crack defect; 3, calculating a degree of plastic failure occurrence of the pressure equipment Lr; 4, calculating a degree of brittle fracture failure occurrence of the pressure equipment Kr'; 5, establishing a failure equation, and substituting an Lr value and a Kr' value into the equation to calculate according to a formula Z=Kr'-(1-0.14Lr2)(0.3+0.7exp(-0.65Lr6)); 6, calculating failure probability of the crack defect by using a Monte Carlo method; and 7, determining a correction factor of the embed crack defect FD, and calculating the failure probability of the pressure equipment. The quantitative risk analyzing method for the pressure equipment with the embed crack defect provided by the invention considers the influence of the embed crack defect on the pressure equipment, so that the precision of a risk analyzing result is improved. The quantitative risk analyzing method for the pressure equipment with the embed crack defect has high pertinence and is more reasonable when the pressure equipment is checked and maintained.

The invention discloses an IMU error online calibration method based on a factor graph and relates to the field of combined navigation. According to the method, the scale factor error and the installation error of the IMU are modeled into a pre-integration model, and navigation information output by the IMU is fused with navigation information provided by other measurement sensors through an optimization theory based on a factor graph model. The error coefficient of the IMU can be obtained after optimization solution. Most traditional IMU error calibration methods are based on off-line calibration, and IMU errors are changed due to mechanical shock or other factors caused by carrier movement, so that the problem that the navigation precision is reduced is solved. The method can effectivelysolve the problem that the precision of the navigation system is reduced due to changes of IMU errors, and can be applied to various integrated navigation systems based on inertial navigation.

The invention provides a method for acquiring and processing remote control information of unmanned aerial vehicle steering engines based on an FPGA. The method provides an FPGA module which comprises a rising edge and falling edge signal acquisition circuit and a filter algorithm signal processing circuit; the method specifically comprises the following steps: each steering engine of the unmanned aerial vehicle is connected to a steering engine driver, each steering engine driver is connected with the FPGA module, the rising edge and falling edge signal acquisition circuit acquires a signal transmitted by a remote control receiver, and the filter algorithm signal processing circuit is used for performing filtering processing on the acquired remote control steering quantity control information to obtain stable remote control steering quantity control information, and sending the information to the flight control unit of the unmanned aerial vehicle by use of a bus. The method is capable of effectively increasing the acquisition frequency of the control signals of multiple steering engines, greatly increasing the response speed and updating the control steering quantity in real time, thereby improving the flight stability of the unmanned aerial vehicle.

A lens has a body shaped to project light from a single compact source approximating a point source. The source projects light onto an inward facing surface of a sign panel, and the source is mounted adjacent to one edge of the sign panel. The lens body has a primary axis and a lateral axis perpendicular to the primary axis, whereby the lens body is intended to be mounted with the primary axis passing through a central plane of the sign assembly in a first direction of the sign assembly and the lateral axis is intended to pass through the central plane of the sign assembly in a second lateral direction of the sign assembly.

A system and method for conserving vacuum within a vehicle is described. In one example, vacuum is conserved via limiting volume expansion of a brake booster working chamber.

The invention discloses a method for preparing a few-layer Ti3C2Tx material with high etching rate and high stripping rate based on a secondary etching method. The method specifically comprises the following steps: pre-etching Ti3AlC2 with an HF aqueous solution to obtain a pre-etched product; preparing a salt solution formed after the reaction of LiF and HCl as a secondary etching agent; immersing the pre-etched product in the secondary etching agent for secondary etching to obtain a secondary etched product; and processing the secondary etched product to obtain the few-layer Ti3C2Tx materialwith high etching rate and high stripping rate. According to the method for preparing the few-layer Ti3C2Tx material with the high etching rate and the high stripping rate based on the secondary etching method, efficient stripping and dispersion of few-layer Ti3C2Tx in the aqueous solution are achieved, long-time ultrasonic stripping does not need to be conducted on Ti3C2Tx in the later period, the preparation efficiency and product performance of the few-layer Ti3C2Tx are improved, and the functionalized application range is enlarged.

The invention relates to a preparation method of a scale inhibitor for a reverse osmosis membrane.The preparation method is characterized by comprising: proportionally mixing and adding organic phosphoric carboxylic acid, polyacrylic acid, polyaspartic acid, cyclohexylamine, a nitro compound and deionized water in succession, heating to 50 DEG C, dropwise adding cyclohexylamine, charging the nitro compound and deionized water, reacting and stirring for about 1 h, and cooling to room temperature to obtain a product.The product has a molecular weight range of 1500 to 4000, and addition of the product in actual water treatment of the reverse osmosis membrane is 3-10 ppm.

A method of evaluating operating capability of a prime mover includes: starting the prime mover with a minimum load requirement threshold; obtaining a reference prime mover operation parameter for the prime mover; comparing the reference prime mover operation parameter with a standard prime mover operation parameter to determine a reference matrix; and adjusting via a TRS controller a standard operation threshold based on the reference matrix to obtain an optimal operation threshold.

A fire resistant and water resistant enclosure for an operable computer digital data storage device is provided. The enclosure has walls made of gypsum or concrete and, in one embodiment, has two small ventilation openings which remain open during normal operation of the digital data storage device and during the presence of fire In the presence of fire, air and superheated steam from inside the enclosure expand and flow outwardly through the ventilation passageways. As those gases flow outwardly, they simultaneously block or prevent the transfer of heat from the exterior fire inwardly through those passageways. A water resistant pouch or coating surrounding the storage device prevents damage from flood, water, steam generated by the insulation or smoke from passing through said passageways and damaging the storage device.

The invention relates to an adjusting system of an automobile steering column. The system comprises a steering column sleeve, an upper support, a clamping support, a cam disc and a handle assembly andfurther comprises frequency sheets arranged between a side board of the upper support and the steering column sleeve, wherein one side face of each frequency sheet is fixedly installed on one of theupper support and the steering column sleeve, the other side face of each frequency sheet is a sliding surface, the other one of the upper support and the steering column sleeve is provided with a sliding fit surface in sliding fit with the corresponding sliding surface, and oil storage structures are arranged on the sliding surfaces or the sliding fit surfaces. Through arrangement of the frequency sheets, the inherent frequency of the whole system can be improved, so that noise caused by gaps of the fit tolerance and the manufacturing tolerance is reduced. Through arrangement of the oil storage structures, the time period required for filling lubricating oil can be greatly prolonged, and the lubricating oil even does not need to be filled in the whole service life of the product.

The invention provides a strontium-containing xenogeneic bone scaffold. The bone scaffold comprises a strontium-ion-loaded xenogeneic bone scaffold body and a polymer biological material surface coating. The good porosity characteristic of the xenogeneic bone scaffold body is used, firstly, strontium is adsorbed on the surface of the scaffold body, and then the surface of the scaffold body is coated with a polymer biological material to protect strontium. Strontium can be loaded in the xenogeneic bone scaffold body quickly, the residence time and release period of strontium on the scaffold body can also be prolonged, and it is hopeful to improve the bone repair effect of traditional xenogeneic bone scaffolds.

Methods and devices that provide enhanced delivery of a composition to a body region of a patient utilizing radiofrequency energy include directing a first electrode and a second electrode coupled toa radiofrequency energy source to a location proximate to the body region. Radiofrequency energy is provided in modulated pulses from the radiofrequency energy source to the body region from at leastone of the first electrode and the second electrode to provide a delivery condition configured to enhance delivery of the composition. The composition is delivered proximate to the body region using acomposition delivery element. Devices for enhance composition delivery are also disclosed.