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64 results about "Subduction" patented technology

Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced to sink due to gravity into the mantle. Regions where this process occurs are known as subduction zones. Rates of subduction are typically in centimeters per year, with the average rate of convergence being approximately two to eight centimeters per year along most plate boundaries.

Pressurized water reactor nuclear power plant loss of coolant accident radioactive source term evaluation method

InactiveCN108537424AActivity classification calculationCalculations are reasonableResourcesNuclear engineeringPressurized water reactor
The invention relates to the field of nuclear radiation safety and particularly relates to a pressurized water reactor nuclear power plant loss of coolant accident radioactive source term evaluation method. The method comprises the following steps: (1) based on reactor equilibrium cycle life end core burden and the release share of radionuclides from the core to a containment atmosphere, the initial radioactivity of radionuclides released to the containment atmosphere by the reactor core is calculated; (2) the radionuclides are divided to three types according to decay types, and according tothe initial value of radionuclides in the containment atmosphere and a generation term and a subduction term during migration and release processes of the radionuclides in the containment, the radioactivity of each radionuclide in the containment atmosphere at different time is classified and calculated; and (3) according to the leakage rate of the containment and the radioactivity of the radionuclides in the containment atmosphere obtain in the second step, the radioactivity of the radionuclides released to the environment is subjected to integral calculation. The calculation method providedin the invention considers a complete nuclide decay chain, and the method is scientific and reasonable and strong in generality.
Owner:NUCLEAR & RADIATION SAFETY CENT

Ecological grassed swale simulation experiment device and experiment operating method thereof

The invention provides an ecological grassed swale simulation experiment device. The ecological grassed swale simulation experiment device comprises a runoff generation device, a flow-through device, a collecting device and a monitoring device, wherein an ecological grassed swale to be analyzed is arranged in the flow-through device; according to the ecological grassed swale simulation experiment device, experiment used water with different pollutant concentrations is prepared to generate surface runoffs with different pollutant concentrations; a water pump is adjusted to generate the surface runoffs with different hydraulic loadings and flow rate conditions; a corresponding valve is used for controlling to generate one or more of rainfall runoff, road runoff and green space runoff; different ecological grassed swales to be analyzed are quantitatively analyzed; the impact degree of the ecological grassed swales with different surface measures and different soil structures on rainwater interception and pollutant subduction is quantitatively analyzed, the structure of the ecological grassed swale suitable for different surface environments can be found, therefore, the simulation experiment device has very important significances on urban rainwater utilization, control of regulation and storage of urban rainfall surface runoff and pollution control. The invention also provides an experiment operating method.
Owner:SHANGHAI JIAO TONG UNIV

Explosive welding method of arranging multiple reinforcing ribs between large-area double-layer steel plates

The invention discloses an explosive welding method of arranging multiple reinforcing ribs between large-area double-layer steel plates. The explosive welding method comprises the following steps of first-stage explosive welding: respectively fixing a die plate I, a die plate II and the reinforcing ribs on a base plate in a spot welding way, putting gap posts on the die plate I, putting an upper panel on the gap posts, arranging explosive on the upper surface of the upper panel, and carrying out the explosive welding; and second-stage explosive welding: overturning welded object obtained in the first stage, taking away the die plate I and the die plate II, filling a die plate III, covering the die plate I on the die plate III, putting the gap posts on the die plate I, putting a lower panel on the gap posts, arranging explosive on the upper surface of the lower panel, and carrying out the explosive welding. According to the explosive welding method disclosed by the invention, compared with the explosive loading amount adopted in an engineering practice in the past, the explosive loading amount is saved by about 18%; a boundary effect subduction method, which refers to a method of additionally arranging lengthened plates at two ends of a cover plate along a detonation spread direction, is adopted; and the explosive using amount is reduced, the welding rate is up to 100%, the strength of a combination interface exceeds that of base material, and the explosive method has the advantage of manufacturing large-area reinforcing rib double-layer steel structural components in good quality and low price.
Owner:中国人民解放军理工大学野战工程学院 +2

UUV 2D sea route planning method based on geographical circumvention theory

The invention provides a UUV 2D sea route planning method based on the geography circumvention theory. The method comprises the following steps: 1. reading parameters of a sea route origin point Ob, a sea route terminal point Oe and each barrier from a mission text; 2. conducting expansion processing on barriers, calculating parameters of each expanded barrier; 3. establishing a set of circumvention points S; 4. if the current point Oc is planned to be the sea route terminal point Oe, or the current point Oc and the sea route terminal point Oe are planned to be visible, turning to step 6, and if not, executing the step 5; 5. searching for the barrier which is nearest to the current point Oc, based on the shape of the barrier, circumventing the barrier, obtaining circumvention points and putting the circumvention points to the set of the circumvention points S, updating the planning of the current point Oc, turning to the step 4; 6. putting the sea route terminal point Oe to the set of the circumvention pints S; 7. conducting subduction on the set of circumvention points S, which completes the planning. According to the invention, the method implements circumvention of the barriers through a simple geography theory, and enables the UUV to obtain a safe and untouched 2D sea route in a rapid and efficient manner in an environment with complex barriers.
Owner:HARBIN ENG UNIV

Natural mineral repairing agent

The invention provides a natural mineral repairing agent. The natural mineral repairing agent is prepared from the following main components of natural zeolite powder, kieselguhr and polymeric aluminum chloride. The natural mineral repairing agent provided by the invention takes natural minerals as the main components, the natural mineral repairing agent not only can be added in a dry powder form,but also can be used by adding water for dissolving, the operation is convenient, the natural mineral repairing agent is environment-friendly and cannot generate secondary pollution after use, a subduction function on bottom mud is obtained, desilting cost can be saved, the treatment effect is lasting, and recurrence is not easy; when the natural mineral repairing agent is used for treating fivekinds of surface water and aquaculture wastewater, pollutants such as COD (Chemical Oxygen Demand), ammonia nitrogen and total phosphorus in water can be rapidly reduced; the natural zeolite in the natural mineral repairing agent has very strong adsorption property on the ammonia nitrogen and is capable of removing 90 percent or above of ammonia nitrogen in the water, so that the natural mineral repairing agent has a very good purifying effect aiming at the water with overproof ammonia nitrogen.
Owner:HUANYA TIANJIN ENVIRONMENTAL PROTECTION TECH CO LTD

Novel vertical deep ocean pipe with slug flow subduction

The invention relates to a novel vertical deep ocean pipe with slug flow subduction. The novel vertical deep ocean pipe with slug flow subduction integrates multiple functions such as slug flow trapping, gas lifting of the bottom part of the vertical pipe, gas-liquid separating of the top part of the vertical pipe, and online monitoring of pressure in the vertical pipe into a whole; an inner pipe and an outer pipe of the vertical pipe are designed; a certain number of communicating holes with definite size are formed in the bottom part and the top part of an inner pipe wall, so that pressure balance of the inner pipe and the outer pipe is kept; one-way floating valves are designed on the communicating hole parts in the top part of the inner pipe wall, so that a fluid of the outer pipe one-way enters the inner pipe; a gas lifting system is designed, and gas enters the inner pipe through communicating holes on an outer pipe wall, so that the density, the speed and the length of a slug flow are changed, and the slug flow subduction under different working conditions is realized; a floating type separator on the top part of the vertical pipe is designed, so that an oil-gas separation effect is produced; and a pressure on-line monitoring system is designed, and pressure sensors are arranged on the bottom part, the middle part and the upper part of the vertical pipe, so that the pressure change in the vertical pipe is monitored in real time, and a basis is provided for gas lifting gas flow regulation.
Owner:SOUTHWEST PETROLEUM UNIV

Preparation method of bacterial cellulose immobilized laccase POPs subduction material

The invention discloses a preparation method of a bacterial cellulose immobilized laccase POPs subduction material. The preparation method is characterized by comprising the following steps: transferring an inclining bacterial strain into a seed culture medium, performing the dynamic culture, then performing the transferring static culture, and obtaining a bacterial cellulose membrane film; processing 0.1 percent NaOH in a water bath, flushing by using deionized water until the neutrality, freeze drying, and obtaining a cellulose dry membrane; and finally preparing the immobilized laccase material by adopting an adsorption-cross linking method, wherein the immobilized laccase material can be used for processing a durability organic pollutant in natural water. The method is simple in operation, safe, environment-friendly and high in controllability. By adopting the bacterial cellulose film prepared in the invention, the laccase can be safely and efficiently immobilized, the enzyme activity can be maximally kept, the problems of the traditional free laccase for degrading the POPs pollutants in the water such as severe loss, difficulty in reusability and the like can be avoided, and the POPs in the natural water can be efficiently and safely degraded and eliminated.
Owner:ZHEJIANG SCI-TECH UNIV

A Robust Trajectory Design and Optimization Method for Self-seeking Short-Range Topping Anti-Tank Missile

The invention relates to a trajectory design and optimization method, in particular to a method for robust trajectory design and parameter optimization of short-distance topping anti-tank missiles, and belongs to the technical field of missile trajectory design. A self-seeking short-distance topping anti-tank missile robust ballistic design and optimization method of the present invention solves the optimal problem of the short-distance topping performance of the image self-seeking anti-tank missile, and then the present invention can be used under constraint conditions And from the initial disturbance situation, a robust ballistic form of image self-seeking short-distance topping anti-tank missile is determined, and the program control section adopts the attitude command form θ c = θ -cq; at line of sight angle q 0 As the starting control condition of the final proportional guidance; the coefficient of the final proportional guidance is N. The ballistic designed by this method is not only robust and practical, but also has near-optimal performance, and can realize dive attack and precise strike at a relatively short target distance. The present invention can be widely used in the ballistic design of self-seeking anti-tank missiles Among them, it has important military application prospects.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Method for determining SWMM water quality scouring model parameter

The invention relates to a method for determining an SWMM water quality scouring model parameter and belongs to the crossing fields of municipal engineering and environmental engineering crossing and the like. First surface runoff water samples are obtained through a surface runoff sampling device, surface runoff water samples at different moments are obtained at the same interval time, pollutant concentration Wt is detected, and the rainfall intensity value qt at the moment t is recorded; a pollutant deposition load value is obtained by combination with detection of earth surface deposition collected in dry days, a unit area pollutant deposition amount initial value undergoes scouring subduction at the moment t to obtain a remaining pollutant cumulant Bt, and Bt, Wt and qt values at different moments in a rain are substituted into an index scouring function formula; each scattered point is drawn through the excel, a tendency chart and a tendency function are added, and values of S1 and S2 are obtained from the tendency function formula. By comparison of engineering practice monitoring results and model simulation results, water quality parameter obtaining correctness is found, and it is indicated that the method has scientificity and practical values.
Owner:BEIJING UNIV OF TECH
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