62 results about "Return period" patented technology

The invention discloses a tree planting method and a tree planting structure in a coastal saline and alkaline area. The tree planting method comprises the steps of building a cofferdam, arranging a lifting layer, carrying out salt pressing and alkali discharging on the lifting layer, digging planting holes, paving waterproof geotechnical cloth, paving a broken stone water filter layer, paving a straw curtain water filter layer, backfilling planting soil and planting trees. According to the tree planting method disclosed by the invention, after the steps and measures are comprehensively adopted, the salt returning period of saline and alkali soil can be slowed down, good conditions are created for the surviving and the growth of the trees due to the soil fertility of the planting soil, and a greenery landscape can be easily formed after the trees are planted; since the terrain is lifted, saline and alkaline original soil is relatively reduced, alkali discharging pipes are not needed to be paved in specific construction, the period of salt discharging and alkali controlling is reduced, and the cost is reduced. The tree planting method and the tree planting structure, disclosed by the invention, are suitable for being popularized and applied in a greening process of the coastal saline and alkaline area.

The present invention discloses an impact force simulation device during a debris flow movement erosion-deposition process. The device comprises a supply box and an accumulation plate which are fixed on a support separately, and a circulation groove is connected between the supply box and the accumulation plate. The circulation groove is equipped with the debris flow laser mud level meters and the optical fiber pressure sensors according to different gradients, vibration string pressure sensors are arranged on the accumulation plate, and a camera and a data acquisition unit are also arranged on the support. The simulation method comprises the steps of 1 setting the gradient of the circulation groove and the accumulation plate; 2 setting a boundary condition; 3 simulating a debris flow medium; 4 setting an initial condition; 5 determining a time step; 6 setting a beta value; 7 acquiring and tidying experiment data; 8 cleaning an experiment platform. According to the present invention, the impact force simulation and experiment during the debris flow movement erosion-deposition process can be realized, and the circulation groove can be adjusted according to different gradients and different boundary conditions. According to the present invention, the circulation groove boundary conditions can satisfy the experiment requirements of the debris flows of different volume-weights, thereby obtaining the impact forces and the accumulation ranges under different return periods and during the movement erosion-deposition process.

The invention relates to a design method for simplifying fatigue for a semi-submersible type platform structure, comprising the following steps: (1) a semi-submersible type platform wave loading long-term forecast is carried out; (2) semi-submersible type platform structure stress long-term Weibull distribution shape parameter is determined; (3) the return-period maximum permissible stress range curve of the semi-submersible type platform structure life period is determined; (4) the return-period hotspot stress range of the semi-submersible type platform structure life period is calculated; (5) the fatigue life of the semi-submersible type platform structure is estimated. Compared with the existing fatigue design method of the platform structure, the design method for simplifying fatigue for semi-submersible type platform structure provided by the invention has the advantages of small workload and accurate calculation result, and can be used in the structure fatigue design of the semi-submersible type platform in the South China Sea.

The invention relates to the field of environmental protection facilities and equipment, in particular to a marsh gas preparation method of a system for preparing marsh gas from domestic garbage. Themarsh gas preparation method comprises the following steps: pretreating, by a pretreatment apparatus on garbage, storing and transporting the pretreated garbage by virtue of a storage and transportation apparatus, transporting the garbage to a crushing apparatus, crushing the garbage, fermenting the crushed garbage by virtue of a fermentation apparatus, storing the fermented garbage by virtue of astorage apparatus, desulphurizing and dehydrating the stored garbage by virtue of a desulphurization and dehydration apparatus, pressurizing the desulphurized and dehydrated garbage by virtue of a pressurizing apparatus, purifying by virtue of a purifying apparatus, and finally storing the purified marsh gas in a storage tank. By adopting the marsh gas preparation method, the recycling degree ofthe garbage can be maximally increased, the equipment is simple, the garbage is thorough in treatment, the cost is low, the investment return period is short, the energy utilization rate is high, thewaste utilization is realized by preparing the marsh gas from the garbage, the living fuel and electric charge can be saved, and the application prospect is promising.

The invention provides a method for pre-estimating an overhead power transmission line wire designed ice thickness. The method includes the step of collecting basic data and establishing fine grid meteorological background field data of past years, the step of estimating a fine grid wire icing thickness, the step of correcting the fine grid wire icing thickness and the step of estimating a wire icing thickness in a return period. The method for pre-estimating the overhead power transmission line wire designed ice thickness provides an effective solution for determining power transmission line wire designed ice thicknesses of regions lack of icing basic data and regions with complex terrain.

A method includes transmitting a next transmission after an inter-frame period after a previous transmission, wherein the inter-frame period is long enough to allow a return signal responding to the previous transmission. A network device includes a receiver to receive a transmission from a source device and a transmitter at least to transmit a return signal to the source device indicating successful receipt or lack thereof of the transmission during a return period forming part of an inter-frame period after the transmission.

The invention provides a method for calculating a multiyear return period wave height of a self-affine fractal on the basis of the Hurst rule. The method comprises the following steps: a, determining a period, periodically acquiring wave height extreme value data and analyzing the wave height extreme value data by utilizing a rescaled range analysis method, wherein the wave height extreme value data meets the Hurst rule; b, according to an analysis result, acquiring parameters of a self-affine fractal model by a least square method; c, calculating the multiyear return period wave height by utilizing the self-affine fractal model. Compared with a calculating result obtained by a conventional method, a calculating result obtained by the method provided by the invention has the advantage that when a designed wave height calculation return period is long, compared with a designed wave height calculated by the conventional method, the designed multiyear return period wave height calculated by the method is more accurate and reliable in obtained result.

The invention discloses a power transmission line icing real-time drawing method for a plateau micro-terrain. The method comprises the steps of step 1, constructing a K.J model and calculating a real-time ice thickness value of each spatial site by utilizing real-time meteorological parameters such as heavy rainfall, air liquid water content, a horizontal wind speed of a vertical lead wire and an air temperature value; step 2, calculating standard ice thickness of each spatial site; step 3, performing spatial interpolation for a Kriging model to obtain a Kriging interpolation ice zone distribution diagram A; step 4, according to the conditions of historical ice observation data, terrain factors and meteorological factors, performing zone division of an ice chart in a multi-year return period; step 5, establishing altitude and ice thickness distribution models of different similar icing zones; step 6, obtaining an ice zone distribution diagram B; and step 7, making a research on a real-time ice zone distribution model. Therefore, the problems of high cost, low efficiency, high risk and the like for manual ice observation caused by the defect of non full consideration of a power transmission line icing research model in real-time meteorology and plateau micro-terrain in the prior art are solved.

The invention discloses a cultivation method for mixed sowing of forage grass in arid desert areas. The method includes the following steps: (1) soil preparation and fertilization: applying farmyard manure after soil preparation, deep tillage, insolation, ditch application of phosphate fertilizer and ploughing and leveling; (2) seed selection: selecting smooth brome grass and clear water alfalfa or red bean grass as mixed seeds; (3) seed dressing and sowing: seed dressing with a compound fertilizer agent and then drilling and sowing; and (4) irrigation and fertilization: (1) irrigation: combining the above-ground spray irrigation and micro-spray with surface spray irrigation, and mainly irrigating leguminous plants in the growth period, specifically, preforming the above-ground spray irrigation in the green returning period and branching period of forage grass each stubble; preforming micro-spray irrigation with surface spray irrigation in a bud stage, a flowering stage and a mature stage; and (2) fertilization: during the first growth period of each alfalfa crop, applying a nitrogen fertilizer of 5-7 kg/mu, 2-3 kg/mu and 2-3 kg/mu along with irrigation water. By adopting the cultivation method for mixed sowing of forage grass, the yield and feeding value of forage grass are obviously improved, water resources are saved, the water utilization rate is improved, and the sustainable development of animal husbandry in arid desert regions is facilitated.

A manufacturer's product registration system includes a database system storing product registration information concerning a plurality of products, for example, consumer electronics products. The product registration information includes, for each unit, a unique identifier or serialization associated with that unit, the date on which that unit was shipped to a retailer, and, if the unit was sold to a consumer, the date on which the unit was sold to a consumer. In addition, the information stored in the database system (which could include one or more databases) includes return policy information concerning a pre-established return policy for each retailer. The product registration system also comprises an interactive voice response (IVR) system for permitting a retail clerk to telephonically enter a Serial Number to query the database system to determine the identity of a particular retailer that sold a particular unit, and to determine whether the particular unit is within a pre-established return period for the retailer that sold that unit. The system also includes a returns tool that provides a means by which a retailer can request a return merchandise authorization (RMA) for one or more units to be returned to the manufacturer. The returns tool is adapted to communicate over a network with the database system.

The invention discloses a typhoon influence considered method for calculating a combined return period of an ocean extreme value, comprising the specific steps of: (1), determining four constraint conditions of a two-dimensional maximum entropy distribution function; (2), deducing a two-dimensional maximum entropy combined distribution mode; (3), determining an integer explicit expression of a mixed distribution moment of an extreme value wave height and an extreme value water level; (4), deducing an undetermined parameter equation set relevant to the mixed distribution moment; (5) constructing a nested composite maximum entropy distribution new mode for calculating the combined return period of the extreme value wave height and the extreme value water level in a typhoon influenced sea area; and (6), verifying the effectiveness of the new method. In the invention, the extreme value wave height and the extreme value water level are comprehensively considered, the influence on the extreme value wave height and the extreme value water level from the typhoon is considered and the whole mode is based on the maximum entropy principle so that the apriority and the artificial assumption of the mode are avoided. The integer explicit expression of the new mode is convenient for the engineering application; and through two groups of ten undetermined parameters, the new mode can be used for fitting the observation data of different sea areas more precisely and flexibly, thereby having wider range of application.

The invention discloses a sea-crossing bridge dynamic response calculation method based on wind wave load combination. The sea-crossing bridge dynamic response calculation method comprises the following steps that 1, Establishing the coupling relationship between wind and wave and wind flow respectively; Step 2: Determining the wind, wave and flow parameters of different return periods, and obtainWind-wave-flow combination in a certain return period according to the coupling relationship of step 1.; Step 3: Determining the wind load point coordinates to generate a random wind field to obtainthe wind load; Step 4: Determining the wave flow point coordinates to generate a random wave flow field, and obtaining the wave load and the water flow load; 5: According to the wind-wave-flow combination obtained in step 2 and the load obtained in steps 3 and 4, obtaining the wind- wave-lfow load combination T; step 6: bringing the combination obtained in step 5 into the bridge across the sea toobtain dynamic response of the bridge. the invention fully considers the coupling relationship between the wind and the waves, and is more suitable for the actual situation, and is applied to the engineering design to reduce the engineering cost.

The invention discloses a rooting agent used for transplanting tobacco crops and playing a role in resisting diseases and promoting growth. The rooting agent comprises the following ingredients in parts by weight: 40-45 parts of a compound microorganism bacterium agent, 20-25 parts of fulvic acid potassium, 40-50 parts of fulvic acid and 1-2 parts of sodium alginate. The rooting agent is simple in process, reasonable in composition proportion and convenient to use, can effectively solve various problems of long seedling returning period, lowering of root activity and the like after tobacco seedlings are transplanted, and can prevent plant diseases and insect pests and improve the drought resistance of the crops. The ingredients of the rooting agent for transplanting does not contain artificially synthesized hormone. Compared with a traditional transplanting method, the rooting agent for transplanting has the advantages that the seedling returning period of large fields is shortened, the growth of lateral roots is promoted, the active absorbing area of the roots is increased, the physiological metabolism strength in the roots can be improved, the disease resistance of tobacco seedlings is improved, and the transplanting survival rate is enhanced.

The invention discloses a Copula function-based flood double-variable improved joint return period ascertaining method. The method comprises the following specific steps of: 1, determining two featurevariables for expressing flood of a certain region; 2, determining a probability statistics model for the feature variables for expressing the flood of the certain region; 3, determining a Copular model for the selected two feature variables of the certain region; 4, calculating a flood double-variable joint return period; 5, deducing a flood double-variable joint return period-based improved joint return period ascertaining method; and 6, verifying effectiveness of the new method. According to the method, the influences of double-variable integral manner in double-variable flood frequency calculation process are considered, so that the influences, on determination of reasonable dangerous regions, of the traditional double-variable integral manner are avoided; the improved joint return period ascertaining method is improved on a joint return period, so that the dangerous region and the integral manner are re-defined, and the method is effective for any Copula function; and the new method is capable of more correctly describing flood dangerous regions, and has wider applicability.

The invention discloses a water and fertilizer management method for whole growth duration of rice. The method comprises the steps of 1 field management, wherein soil is turned at the depth of 30 cm to 40 cm, base fertilizer is applied at 150-200 kg/mu, irrigation and wet tillage are conducted, and after soaking is conducted for 1 d to 2 d, furrowing and transplanting are conducted; 2 transplanting-green returning period, wherein the state that a water layer in a field does not submerge uppermost completely-leafed auricles of rice seedlings is kept; 3 green returning-tillering period, wherein intermittent irrigation is conducted; 4 tillering-ear breeding period, wherein tillering fertilizer topdressing is conducted, and watering is conducted until the water layer height is 3 cm to 4 cm; 5 ear breeding-earing period, wherein earing fertilizer is sprayed on the leaf surfaces, and meanwhile intermittent irrigation is conducted; 6 filling period, wherein the earing fertilizer is sprayed on the leaf surfaces, intermittent irrigation is conducted, and water draining for field drying is conducted 5-7 days before harvesting. According to the method, the fertilizer and the water are scientifically managed, the fertilizer is regulated by the water, shallow and frequent irrigation is conducted, promotion and control are combined, qi is regulated by the water, roots are nourished by qi, leaves are protected by the roots, the yield is guaranteed by the leaves, therefore, the environmental conditions are improved, pathogenic bacterium reproduction and infection are controlled, the rice grows healthily and strongly, and the disease resistance is improved; in addition, the rice has the advantages of being high in effective tillering rate, long in ear and high in setting rate in the grow period.

The invention discloses an urban water logging forecasting method, electronic equipment and a storage medium. The method includes the following steps: establishing an urban water logging model; developing design rainfall of different return periods according to a local storm intensity formula and a Chicago rainfall pattern; inputting the design rainfall into the urban water logging model for performing calculation to obtain urban water logging data with different times of a rainfall process, and storing the data in a database; obtaining urban forecast rainfall, and obtaining urban water logging data corresponding to the urban forecast rainfall according to the corresponding design rainfall of the return periods in an urban forecast rainfall inquiry database; and performing waterlogging risk forecast according to urban water logging data corresponding to the urban forecast rainfall. According to rainfall forecast information released by an urban meteorological bureau in advance, the method can determine corresponding design rainfall by comparison of the design rainfall in the database, thereby determining corresponding urban water logging data, forecast in advance of urban water logging risk information is achieved, and urban water logging risk forecast efficiency and precision are greatly improved.

The invention discloses a Halphen B distribution-based flood frequency analysis method and system, and belongs to the field of hydrologic analysis and computation. The method comprises the steps of firstly introducing Halphen B distribution in flood frequency analysis; constructing a flood probability density function; realizing parameter estimation of the Halphen B distribution by adopting a maximum entropy principle according to characteristics of a distribution function; and deducing a design flood value in a T-year return period by utilizing the flood probability density function. The invention furthermore realizes the Halphen B distribution-based flood frequency analysis system. The flood frequency analysis method and system is very suitable for hydrologic frequency analysis, and a fitting result of the Halphen B distribution is basically superior to that of other conventional distribution in hydrologic frequency analysis; and a more effective way is provided for the hydrologic frequency analysis.

The invention discloses a method for determining a return period of chlorophyll a. The joint distribution of the chlorophyll a and environment variables is constructed by Copula functions to research the relevance between the chlorophyll a and the environment variables so as to determine the return period of the chlorophyll a. According to the method, the relevance between the chlorophyll a and environmental factors is researched by a Copula function method, the relativity between the chlorophyll a and the environmental factors can be determined through Kendall 'st, and the joint distribution of the chlorophyll a and the environmental factors can be acquired under the conditions of not assuming edge distribution types, so that the return period of the chlorophyll a is predicted under the condition of different environment variable changes, and a scientific decision-making basis for lake eutrophication management is provided.

The invention discloses a selection method for an initialization-and-refresh (IR) state returning period of a robust header compression (ROHC) device. The method comprises: a current channel quality parameter is obtained and is sent to a trained support vector machine, and an IR state returning period is selected based on the current channel quality parameter by using the support vector machine; and an IR state returning period of the ROHC device is adjusted according to the IR state returning period selected by the support vector machine. In addition, the invention also discloses a selection apparatus for an IR state returning period of an ROHC device.