32results about How to "Good quality and reliability" patented technology

The invention discloses a separately precast and assembled bent cap which comprises a plurality of precast components for being assembled to be the bent cap; the precast components are a plurality of separately precast bent caps formed by dividing the bent cap along the length direction; and the separately precast bent caps form fixed connection by adopting a prestress connection way during assembling. The invention further discloses a construction technology for the separately precast and assembled bent cap. The separately precast and assembled bent cap disclosed by the invention has the advantages of simple structure and convenience in assembling. The construction technology for the separately precast and assembled bent cap has the benefits that a support is not required to be erected, limitations from auxiliary equipment are less, and environmental impacts are small.

The invention relates to a smart micro-grid system. The smart micro-grid system comprises a local control layer, a network communication layer, a master station layer and a software layer, wherein the local control layer is in communication with the master station layer through the network communication layer, and the master station layer is in communication with the software layer through an information interaction bus. The smart micro-grid system integrates photovoltaic power generation, wind power generation, multiple types of energy storage systems multiple in capacity and modern power electronic, communication and control technologies. While high-reliability power supply is achieved, optimized allocation of renewable energy resources and high-reliability power supply to loads in a micro-grid are achieved; the interaction relation between the micro-grid and an external power grid is reflected correctly, and the effect of distributed energy on improvement of power supply reliability is fully shown; operation data of photovoltaic, wind power and energy storage systems and the micro-grid systems can be collected and stored, and the operation data are accumulated for researches on key technologies about micro-grids. The smart micro-grid system solves the problems that an existing micro-grid system is low in energy utilization ratio and poor in environmental benefit, electric energy quality and power supply reliability.

The invention discloses low-temperature resistant low-alloy structural steel. The low-temperature resistant low-alloy structural steel comprises the following ingredients in percentage by mass: 0.13-0.20% of C, 0.15-0.55% of Si, 1.00-1.75% of Mn, not higher than 0.015 of P, not higher than 0.005 of S, 0.02-0.12% of V, 0.015-0.050% of Nb, 0.010-0.035% of Als, 0.020-0.050% of Re, not higher than 0.010% of Ti, not higher than 0.35% of Cr, not higher than 0.55% of Ni, not higher than 0.15% of Cu, not higher than 0.020% of As, not higher than 0.020% of Sn, not higher than 0.0025% of Pb, not higher than 0.025% of Sb, not higher than 0.005% of Bi, not higher than 15ppm of [O], not higher than 2.0ppm of [H] and the balance of Fe and unavoidable impurities. A wind power generator tower tube flange, which is manufactured through forging a steel billet prepared from the steel, has the advantages that the mechanical properties are stable, the low-temperature impact property is excellent, and the internal quality is excellent.

The invention provides a power distribution network fault positioning method and system based on a micro PMU and dichotomy search. The power distribution network fault positioning method comprises thesteps of calculating a positive sequence component of a fault current at a fault point by utilizing a power supply before and after fault measurement by the micro PMU in a fault observable configuration and a current at a load, and injecting the positive sequence component into the assumed fault point to construct a positive sequence fault additional component network; performing fault point searching on lines on the basis of dichotomy in the positive sequence fault additional component network in sequence, and according to an admittance matrix formed in the search process and the positive sequence component of the fault current, obtaining voltage positive sequence fault component calculation values of all PMU configuration nodes; calculating voltage deviation norms between the voltage positive sequence fault component calculation values of all the PMU configuration nodes and actual measurement values, and determining fault positions corresponding to the minimum values of the positivesequence voltage deviation norms of the lines as candidate fault points; and screening out the candidate fault points corresponding to the minimum values of the positive sequence voltage deviation norms corresponding to the candidate fault points to serve as actual fault points.

The invention belongs to the technical field of parts surface treatment, and relates to a graphene-modified laser absorbing layer coating and a coating method thereof; the coating is mainly composed of polyurethane resin, black auxiliary materials, functional additives and deionized water; the invention uses graphite After olefin modification, a higher amplitude and deeper surface residual compressive stress distribution is produced on the surface of the part. The laser absorbing layer coating is coated on the surface of the part by high-pressure gas-driven spraying. After drying, a coating with uniform thickness is obtained on the surface of the complex part, and the bonding force between the coating and the part is good. It can be removed by hand peeling. The method has the advantages of high coating efficiency, good quality reliability, and high removal efficiency, and is beneficial to the processing of complex parts and its mass production.

The disclosed subject matter provides a composite semiconductor device which can include a common substrate, a first semiconductor light emitting structure, and a second semiconductor light emitting structure. The first semiconductor light emitting structure can include an epitaxial grown layer containing a light emitting layer formed on part of the common substrate either directly or via a bonding layer. The second semiconductor light emitting structure can be provided in a notch at at least one location to which the epitaxial grown layer is not bonded, or in a recess formed in the notch at one location. The disclosed subject matter also provides a method of manufacturing a composite semiconductor device having the above-described and other structures.

The invention discloses a multistage composite silencing silencer. The multistage composite silencing silencer comprises a pipe joint, a silencing cover, a lower shell, an upper shell, a silencing net, an exhaust pipe and sound absorbing materials. By arranging four stages of silencing chambers with ventilation net section area which is gradually increased, the silencing cover and the silencing net with alternating large and small holes for silencing and the sound absorbing materials for composite silencing, noises can be reduced by 20-25 decibels, the noises beside ears become gentle from harsh, high, medium and low hearable components in audio spectra are obviously decreased and interference and harm to people are reduced. The invention additionally provides a preparation method of the multistage composite silencing silencer. Riveting and roll welding processes are used for replacing an oxyacetylene welding process, the quality reliability is high, the appearance quality is obviously improved and the corresponding productivity is improved by 1-2 times.

The invention discloses a separately precast and assembled bent cap which comprises a plurality of precast components for being assembled to be the bent cap; the precast components are a plurality of separately precast bent caps formed by dividing the bent cap along the length direction; and the separately precast bent caps form fixed connection by adopting a prestress connection way during assembling. The invention further discloses a construction technology for the separately precast and assembled bent cap. The separately precast and assembled bent cap disclosed by the invention has the advantages of simple structure and convenience in assembling. The construction technology for the separately precast and assembled bent cap has the benefits that a support is not required to be erected, limitations from auxiliary equipment are less, and environmental impacts are small.