45results about How to "Economic unity" patented technology

The present invention belongs to the technical field of water ecological restoration, and specifically discloses a rapid method for constructing a river way water ecosystem, the method includes the following steps: 1, collecting of to-be-repaired river way water ecological information; 2, detailed analysis of pollution information, sewage interception reoxygenation and blackness and odor removal by microbial decomposition; 3, planting of emergent proper aquatic plants, submerged plants and the like according to water and hydrological information; 4, control of algae by aquatic animals; and 5, water ecosystem maintenance; wherein aquatic plants are usually harvested in November each year, and plant body residues are cleaned up in early spring. Through combination of an ECO-EGG plug-flow aerator and the constructed river way water ecosystem, physical, chemical and biological-ecological approaches are effectively combined for phased treatment, water quality is rapidly improved, water eutrophication is controlled, water self-purification capacity can be improved, the water ecological structure and function can be restored, water quality can be long term and effectively improved, meanwhile the effectiveness, long effectiveness, economical efficiency and ecological compatibility of polluted water treatment can be unified.

The invention discloses a method for recycling of soybean whey wastewater by a membrane separation technology. The method includes: sterilization pretreatment; flocculation and centrifugal separation for impurity removal; whey protein recovery by ultrafiltration membrane continuous separation; whey protein powder recovery; oligosaccharide syrup recovery by nanofiltration membrane continuous concentration; oligosaccharide recovery; and dialysis water recovery by reverse osmosis membrane continuous concentration. The method provided in the invention can avoid whey wastewater rancidity and ultrafiltration membrane pollution and plugging, and improves the product quality. Employment of the continuous separation concentration mode reduces stay of intercepted objects or protein, impurity concentrated liquors in a membrane assembly to the utmost, and back-and-forth circulation between a membrane liquid inlet tank and a membrane system no longer exists. Meanwhile, the membrane surface flow speed is controlled, so that the problems of membrane pollution and low separation efficiency are solved. An osmosis filtration membrane washing process is adopted, and water is added automatically for filter wash, so that the membrane pollution and plugging problems are solved, and the product quality is improved. The selection of high temperature resistant hydrophilic membrane materials guarantee a high water flux and help to reduce membrane pollution.

The invention discloses a rock slope anchoring calculation method based on safety and economy multi-objective optimization. The rock slope anchoring calculation method comprises the following steps: step 1, drawing up calculation parameters of a rock slope; step 2, carrying out stress analysis on the rock slope; step 3, establishing a dual-objective function of rock slope safety and economy; step4, establishing a rock slope safety and economy multi-objective optimization nonlinear mathematical programming model which uses the double-objective function and combines rock balance equation constraint conditions, structural surface yield conditions and anchor rod additional constraint conditions at the same time; step 5, constructing an evaluation function by using a weighted sum method, and converting the nonlinear mathematical programming model for solving the multi-objective optimization into a nonlinear mathematical programming model for solving the single-objective optimization; and solving the model by using a penalty function method of nonlinear programming to obtain a safety coefficient and an anchoring cost which meet the optimal safety and economy at the same time, and an optimal anchoring angle. According to the method, the unification of economy and safety is achieved.

The invention discloses a method for computing an optimal anchoring angle of a rock slope wedge, and belongs to the technical field of analyzing the stability of a rock slope and strengthening the rock slope. A security coefficient of the wedge-shaped slope serves as an objective function, the angle and the direction of anchoring force serve as optimization variables, constraint conditions such as the balance equation of the wedge, the yield condition of a structural surface and the boundary condition are combined, and the method which is used for computing the optimal anchoring angle of the wedge and can maximize the security coefficient is provided. The computing method can compute and obtain the optimal anchoring angle of the wedge accurately, easily and conveniently, has the advantages of being clear in concept, high in computing accuracy and the like, and brings convenience for engineering technicians to carry out optimal design for strengthening the wedge so as to achieve the purpose of being safe and economical.

Provided is a distribution transformer optimal selection method with fault risk and whole life cycle cost influence being taken into consideration. The method quantifies the fault risks of the distribution transformer under different overloads, makes cost compositions in a whole life cycle model clear, obtains whole life cycle cost considering fault risk by adding fault risk to the model, and carries out assessment decision on capacity selection risk due to distribution transformer overload by combining a decision-making tree method so as to determine an optimal distribution transformer selection scheme. The distribution transformer optimal selection method realizes integration of energy saving performance and economical performance of capacity selection of the distribution transformer by comprehensively comparing each cost in the whole life cycle of the distribution transformer; and meanwhile, the fault risk of the distribution transformer under the overload condition is taken into consideration, so that the corrected whole life cycle model is allowed to meet the practical situation better, and the method provides more reliable data support for the optimal selection of the distribution transformer.

The invention discloses a formula and a production technology of a saggar for firing a cathode material for a lithium battery. The formula comprises a surface composite layer formula and a sagger mainbody formula, wherein the surface composite layer formula comprises the following components in percentage by mass: 18 to 22 percent of zircon sand with 200 meshes, 8 to 10 percent of superfine zircon sand with 8000 meshes, 16 to 20 percent of alumina powder with 800 meshes, 16 to 23 percent of cordierite with 100 meshes or below and 30 percent of Suzhou kaolin with 325 meshes; the sagger main body formula comprises 8 to 12 percent of cordierite with 8 to 16 meshes, 20 to 24 percent of cordierite with 16 to 60 meshes, 3 to 7 percent of cordierite with 60 to 100 meshes, 1 to 5 percent of cordierite with 100 meshes or above, 9 to 12 percent of mullite with 16 to 60 meshes, 18 to 22 percent of alumina powder with 800 meshes, 25 percent of No.2 hand-selected Suzhou kaolin with 325 meshes and3 to 5 percent of yellow dextrin. The formula and the production technology disclosed by the invention have the beneficial effects that firstly, in the formula of the saggar, the zircon sand is used to replace ZrO2, and the price of the zircon sand is relatively low, so that the production cost of the saggar is greatly reduced; secondly, the saggar prepared by adopting the formula and the technology disclosed by the invention has a zircon sand composite layer and higher corrosion resistance; thirdly, the economy and the high performance are perfectly unified.

The invention discloses a micro-grid energy optimization method considering economic dispatch and loop current suppression. The micro-grid energy optimization method considering the economic dispatch and loop current suppression includes steps that initializing parameters of a micro-grid system; using an evolutionary game theory to obtain an active power reference value of each micro-source to realize the dynamic economic dispatch of the micro-grid; combining with a virtual impedance technology to realize the loop current suppression between micro-grids; outputting the energy optimization result of the whole micro-grid system. The micro-grid energy optimization method considering the economic dispatch and loop current suppression uses the evolutionary game theory to realize the dynamic economic dispatch of the micro-sources based on cost-effectiveness functions of each micro-source; and meanwhile, the micro-grid energy optimization method considering the economic dispatch and loop current suppression uses the virtual impedance technology and a droop control technology to design an equivalent output impedance of each parallel inverter to enable each micro-source to distribute power according to the power reference value obtained through the evolutionary game theory so as to realize the loop current suppression of the whole micro-grid system.

The invention discloses a step-by-step method for controlling the total amount of air pollution. The method includes: performing basic reduction quantity calculation of pollution sources; calculating affirmative reduction quantity with a multi-source model method; performing optimal allocation of total amount controlled load. An A-P value method and the multi-source model method are integrated, an optimal allocation model is introduced, and a method system which is reasonable in technology and economically feasible is formed.

The invention discloses a manufacturing method of a graphite-contained high-speed steel centrifugal composite steel core roller, and belongs to the field of mechanical casting. Chemical elements of B and N are introduced in a traditional high-speed steel component, MC type and / or M2C type dotted and / or blocky high-hard alloy carbides, nitrides and borides with the total area percentage of 20% to 35% are dispersed and distributed in a work layer base body structure; through carbide, nitride and boride modification, graphite is subject to two-step treatment of modification and inoculation, graphite is precipitated in an original structure, and therefore the high-speed steel roller has the advantages of the specific high-temperature wear resisting of traditional high-speed steel and meanwhile the problem that an original traditional high-speed steel roller is large in friction coefficient is solved; wear-resisting performance of the high-speed steel is fully developed, the lubricating effect between the roller and a workpiece in the rolling process is achieved, and happening of the steel bonding phenomenon is avoided; due to the heat conduction performance and the lubricating characteristic of graphite, the defects that the high-speed steel roller is sensitive to hot impact and hot-cracking susceptibility, steel bonding is prone to happening, and surface roughing is prone to happening can be overcome, and particularly when a finished product rack is used, the surface bright degree of a rolled material is obviously improved.

The invention discloses a method for separating and extracting raw material metal salt from wastewater in production of a copper-based catalyst. The method comprises the following steps of 1. separating and collecting the wastewater; 2. pretreating the wastewater; 3. concentrating an RO (reverse osmosis) membrane; and 4. separating an NF (nanofiltration) membrane. The method has the advantages that the high valence metal salt can be recovered from the wastewater and utilized according to each process for producing the copper-based catalyst, the recovery rate reaches more than 90%, the operation is simple, the secondary pollution is avoided, the efficiency is high, the economy is realized, the environment-friendly effect is realized, and the like. The timely treatment of the wastewater is carried out through the whole catalyst production line, the wastewater generated in different working sections is separated and collected, the necessary assurance is provided for the subsequent separating treatment of the wastewater, and the uniformity of the economy and the technique is realized in the whole process.

The invention relates to a method for arresting ductile fracture of natural gas pipelines of level X100 and above, wherein two or more fracture arresting steel pipes, which are relatively low in strength level but relatively high in wall thickness and toughness, are connected among X100 or higher-level steel pipes at intervals of 50-100 steel pipes and by a length within a range of 600-1200 m; and the wall thickness of the fracture arresting steel pipe is calculated according to pressure bearing capacity the same as that of a main pipeline, while the toughness thereof is determined by a method recommended in Petroleum and Natural Gas Industries-Steel Pipe for Pipeline Transport System ISO 3183: 2007 and the appendix G of Pipeline Steel Pipe Standards (Version 44) API Spec5L: 2007. The manufacturing technical difficulty and the manufacturing cost of the fracture arresting steel pipe with low strength level and high toughness are low, and the toughness index thereof is easy to achieve, so that the safety requirements of the pipeline fracture arrest are met, and unification of safety and economical efficiency is realized.

The invention discloses a method for recycling of soybean whey wastewater by a membrane separation technology. The method includes: sterilization pretreatment; flocculation and centrifugal separation for impurity removal; whey protein recovery by ultrafiltration membrane continuous separation; whey protein powder recovery; oligosaccharide syrup recovery by nanofiltration membrane continuous concentration; oligosaccharide recovery; and dialysis water recovery by reverse osmosis membrane continuous concentration. The method provided in the invention can avoid whey wastewater rancidity and ultrafiltration membrane pollution and plugging, and improves the product quality. Employment of the continuous separation concentration mode reduces stay of intercepted objects or protein, impurity concentrated liquors in a membrane assembly to the utmost, and back-and-forth circulation between a membrane liquid inlet tank and a membrane system no longer exists. Meanwhile, the membrane surface flow speed is controlled, so that the problems of membrane pollution and low separation efficiency are solved. An osmosis filtration membrane washing process is adopted, and water is added automatically for filter wash, so that the membrane pollution and plugging problems are solved, and the product quality is improved. The selection of high temperature resistant hydrophilic membrane materials guarantee a high water flux and help to reduce membrane pollution.

The invention discloses a method and a device for configuring a phase modulator of a high-capacity VSC converter station. The method comprises the following steps of: collecting a response curve of active power of a VSC-HVDC system about time in each expected fault, and a response curve of the active power of the VSC-HVDC about the time in each expected fault when phase modulators with different quantities are configured; calculating the effect indexes of the configured phase modulators for improvement of the VSC-HVDC system alternating current fault ride-through capacity according to the response curves; calculating the effect-cost comprehensive evaluation indexes of the configured phase modulators for improvement of the VSC-HVDC system alternating current fault ride-through capacity according to the effect indexes; and selecting the optimal configuration quantity of the phase modulator according to the effect-cost comprehensive evaluation indexes. The method and a device for configuring a phase modulator of a high-capacity VSC converter station achieves the unification of the safety and the economy of the phase modulator configuration and provides a technical idea for the near-zone dynamic reactive compensation configuration of the high-capacity converter station.

The invention discloses a water recycling process used in a copper-based catalyst production process. The invention belongs to the technical field of copper-based catalyst preparation. According to the invention, a sodium nitrate aqueous solution obtained by precipitation and filtration of the copper-based catalyst, and a sodium nitrate aqueous solution obtained in a filter cake washing process are processed through a water-processing system with reverse osmosis as a core processing manner; when fresh water reaches a reutilization standard, the fresh water is reutilized in a production line; and concentrated sodium nitrate aqueous solution is subjected to multi-effect evaporation, such that a sodium nitrate product is obtained. The technology is suitable to be used in production processes of copper-based catalyst used in methanol synthesis, methanol cracking hydrogen production, gas-phase dehydrogenation, gas-phase hydrogenation, carbon monoxide low-temperature shift, and the like.

The present invention discloses an underground gas storage well safety status grade evaluation method. The method comprises the steps of making the concrete test evaluation items, wherein the evaluation items comprise the external macroscopic situation, the wellhead thread corrosion damage, the material, the internal corrosion, the external corrosion thinning, the crack, the well cementation, a pressure-tight test and an air-tight test; according to the test situations of the items, evaluating separately, and taking the lowest item grade as the gas storage well safety status evaluation grade. The underground gas storage well safety status grade evaluation method solves the disadvantages that a conventional fixed pressure container safety status evaluation method lacks pertinency for the underground gas storage wells, is not strong in applicability and lacks operability.

The invention relates to a control method of a clutch based on revolving speed and belongs to the field of clutch control. The control method provided by the invention is characterized that a clutch MAP figure control strategy is adopted in slipping stage of a clutch, the MAP figure lookup calculation is carried out according to the revolving speed difference of an output torque of the clutch and the input shaft of the clutch and the output shaft of the clutch, thereby controlling the position of the clutch; and driving intention of a driver is judged to output a clutch rotation speed target value curve according to the size and variable rate of an engine throttle; the D-value of the target value and actual value of the clutch revolving speed is calculated by virtue of PID (proportion integration differentiation), the position of the clutch is subjected to fine tuning, thereby meeting different driving intentions and travelling conditions. Compared with fuzzy control and a neural network, the control method provided by the invention has the advantages of small computational load, simple structure, and strong control instantaneity, and overcomes the delay problem of a controller singlechip caused by complicated control, and overcomes the influence from the variation in load of vehicles on the combined process; the dynamic property and economy of the automobile are unified by virtue of building MAP on a great deal calibration test, and the relation of the parameter characteristic and control objective in control process is clear and definite.

The invention provides a steel slag modifier with structural grinding aid and surface coating functions and a preparation method thereof. The steel slag modifier with the structural grinding aid and surface coating functions comprises the following raw materials, by weight, 5.0%-20.0% of ethylene glycol, 5.0%-20.0% of triisopropanolamine, 5.0%-20.0% of triethanolamine, 35.0%-70.0% of liquid paraffin and 15.0%-50.0% of kerosene. Compared with the prior art, the steel slag modifier are compounded by the raw materials, the stirring temperature, the stirring speed and the stirring time are controlled, a steel slag compounding agent with the structural grinding aid and surface coating functions is obtained, and the obvious effects on improving the grindability and dispersibility of steel slag are achieved. According to the steel slag modifier with the structural grinding aid and surface coating functions and the preparation method thereof, the energy consumption of steel slag grinding can be reduced, the production process is environment-friendly and pollution-free, furthermore, the components are simple, the cost is low, the unification of economy and environment friendliness is realized, the economic benefit and social benefit are obvious, and the popularization and application of steel slag ultrafine powder are facilitated.

The invention provides a steel plate concrete shear wall column reinforcement design method which comprises the following steps: firstly, analyzing and calculating an overall structure model to obtaina design internal force, an axial force, a bending moment and a shear force of each wall column; calculating the axial compression ratio of the wall column, and determining the type of an edge component so as to determine the minimum value of the corresponding construction measure requirement; determining the profile steel area Aa configured in the shadow part of the edge component; determining the area Ap of a steel plate configured in the shear wall according to the shear section limit value condition, and determining the type of a calculation formula according to the numerical range of theAp; determining the reinforcement ratio of the vertical distribution bars of the wall column; checking and calculating the bearing capacity of the normal section, obtaining the area As of the longitudinal reinforcing steel bars configured in the shadow part of the edge component by taking the larger value of the bias voltage and bias tension calculation result, and determining the calculation mode according to whether As exceeds the limit or not; calculating the shear capacity of the oblique section to obtain the area Ash of the horizontally distributed steel bars of the shear wall, and determining the calculation mode according to whether the area Ash of the horizontally distributed steel bars of the shear wall exceeds the limit or not.

The invention discloses an aircraft with wings capable of rotating integrally. The aircraft comprises a fuselage, the wings, a power mechanism and a mounting groove; the head of the fuselage is front-rear symmetrically provided with balance canards, the middle part of the upper end of the fuselage is provided with the mounting groove, and the wings and the power mechanism are installed in the mounting groove; the power mechanism includes a first power motor and a power gear, and the first power motor is a double shaft motor, and two motor shafts of the first power motor are correspondingly provided with power gears; and the inner parts of the wings are provided with a first rotating shaft, the front and rear sides of the first rotating shaft are correspondingly provided with rotating shaftseats in a sleeving mode, and the middle position of the first rotating shaft is provided with a first fixed gear. According to the aircraft with wings capable of rotating integrally, the adjustmentof the wing angle during taking-off, flight and landing can be achieved through structural parts such as the power mechanism, the first rotating shaft, the rotating shaft seats and a first brake mechanism, so that the aircraft can realize vertical taking-off and landing, and at the same time, the aircraft can take off at the most economical and reasonable wing angle so as to realize the unity of safety, stability, economy and comfort level.

The invention discloses a boiler thermal efficiency online calculation method of a household garbage incineration boiler, and relates to the technical field of energy conservation of household garbage incineration boilers. The problem that in the prior art, the boiler heat efficiency of the household garbage incineration boiler with the external steam air preheater cannot be accurately obtained in real time is solved. Smoke exhaust heat loss heat Q2, gas incomplete combustion heat loss heat Q3, solid incomplete combustion heat loss heat Q4, boiler heat dissipation loss Q5, ash physical heat loss heat Q6 and input heat Qin are obtained through collected data, and then the boiler heat efficiency eta'is obtained through the collected data Q2, Q3, Q4, Q5, Q6 and Qin; and the boiler thermal efficiency online calculation platform corrects the boiler thermal efficiency eta'through an iterative algorithm, so that the corrected boiler thermal efficiency eta 'is obtained, and finally online calculation of the boiler thermal efficiency is completed. The invention is mainly used for on-line calculation of the thermal efficiency of the boiler.

The invention relates to a method for stabilizing the network side voltage of a wind power generator unit, which comprises the following steps of: (1) constructing a reactive power regulating reactance network which meets the requirement that the network side voltage of the wind power generator unit is regulated to realize stable running of the unit; (2) controlling a main body to detect the network side voltage of the wind power generator unit; and (3) when the network side voltage of the wind power generator unit is deflected from the voltage range for the stable running of the unit, controlling the main body to confirm reactive power current needed by voltage regulation and outputting or inputting the current by a current transformer for adjusting the network side voltage of the unit. The invention realizes network side voltage regulation by utilizing the reactive power ability of the current transformer of the wind power generator unit, has the advantages of low regulating cost, less power grid construction investment, high system reliability, high regulating efficiency, and the like and is easy to realize the unification of effectiveness and economy of voltage regulation.

The invention discloses a method for calculating the optimal excavation slope ratio of a mine slope. The invention takes the mine slope as the research object, and establishes a multi-objective optimization non-linear mathematical programming model for the stability, safety and excavation economy of the mine slope. The model takes the maximum value of the safety factor and the maximum value of the excavation benefit as the objective function; and takes the excavation slope rate, the shear force and the normal force of the structural surface as the decision variables, and the balance equation constraints of the slope sliding mass , The yield condition of the structural surface is a constraint condition, and the gravity function constructed in the constraint condition can change with the change of the excavation slope rate, so that the constraint condition of the limit equilibrium of the slope sliding mass can be well connected with the mine slope Safety and economy, thus more in line with the actual mine slope excavation requirements; through the method of the present invention can directly obtain the optimal excavation slope ratio of the mine slope, so that the excavation benefit is the highest while the stability and safety factor is the largest, thereby achieving Unification of excavation economy and stability and safety.

The invention discloses a manufacturing method of a graphite-contained high-speed steel centrifugal composite steel core roller, and belongs to the field of mechanical casting. Chemical elements of B and N are introduced in a traditional high-speed steel component, MC type and / or M2C type dotted and / or blocky high-hard alloy carbides, nitrides and borides with the total area percentage of 20% to 35% are dispersed and distributed in a work layer base body structure; through carbide, nitride and boride modification, graphite is subject to two-step treatment of modification and inoculation, graphite is precipitated in an original structure, and therefore the high-speed steel roller has the advantages of the specific high-temperature wear resisting of traditional high-speed steel and meanwhile the problem that an original traditional high-speed steel roller is large in friction coefficient is solved; wear-resisting performance of the high-speed steel is fully developed, the lubricating effect between the roller and a workpiece in the rolling process is achieved, and happening of the steel bonding phenomenon is avoided; due to the heat conduction performance and the lubricating characteristic of graphite, the defects that the high-speed steel roller is sensitive to hot impact and hot-cracking susceptibility, steel bonding is prone to happening, and surface roughing is prone to happening can be overcome, and particularly when a finished product rack is used, the surface bright degree of a rolled material is obviously improved.

The invention discloses a direct-current transmission line protection configuration setting method with the electromagnetic coupling relationship taken into consideration. The method comprises the step one of line fault analysis and judgment, the step two of protection starting, the step three of pole logic selection, the step four of disturbance elimination and the step five of boundary determination. According to the method, the situation of possible occurrence of faults of a high-voltage direct-current transmission line is objectively and accurately taken into consideration, influence on normal poles from the faulty poles due to the electromagnetic coupling relationship among polar lines is also taken into consideration, the problem that existing protection is not comprehensive enough is solved, the logic is adjusted without replacing hardware of original line protection, the engineering availability is high, the disturbance-resisting capacity of high-voltage direct-current transmission line protection to false operation possibly occurring due to the electromagnetic coupling relationship is improved, the sensitivity and the effectiveness to the line faults are enhanced, and the unification of the technicality and the economy and the unification of the reliability and the sensitivity of high-voltage direct-current transmission line protection engineering are achieved.

The invention relates to the field of micro-grids, in particular to a multi-target hierarchical economic dispatching method for a micro-grid containing an electric vehicle, which comprises the steps of upper-layer source grid-level dispatching of the micro-grid and lower-layer load-level dispatching of the micro-grid. An optimization target is established for the micro-grid in a hierarchical manner based on the operation characteristics of each dispatching participating unit of the micro-grid to carry out coordination control. Micro-grid economic dispatching is divided into upper-layer source network-level dispatching and lower-layer load-level dispatching, the upper-layer source network-level dispatching obtains an optimal energy storage plan according to real-time power and capacity limitation of a distributed renewable energy unit, an energy storage system and a conventional load in the micro-grid, and lower-layer load-level optimization operation considers electric vehicle access. And according to the unbalanced power in the micro-grid after the upper-layer source network level optimization, the charging electricity price of the electric vehicle is formulated, and an ordered charging strategy of the electric vehicle is solved. According to the method, the consumption level of renewable energy sources in the microgrid can be improved, and a basis is provided for unification of economy and safety of the microgrid, an electric vehicle group and a power system main network.

The invention relates to a method for recycling copper and zinc in catalyst production wastewater. The method mainly uses an ultra-filtration system unit, a nano-filtration system unit and an electrodialysis system unit. The method comprises the following steps: a, removing SS and colloid in catalyst production wastewater by using the ultra-filtration system unit, and introducing produced water into the nano-filtration system unit; b, separating and concentrating copper and zinc ions in the water produced by the ultra-filtration system unit by using the nano-filtration system unit technology, introducing nano-filtration produced water into a salt recovery system, and introducing nano-filtration concentrated water into the electrodialysis system unit; and c, effectively separating mono-valent ions and divalent ions in the nano-filtration concentrated solution by the electrodialysis system unit, efficiently enriching copper and zinc ions, recycling the copper and zinc ions, and introducing electrodialysis produced water into a salt recycling system. According to the method, copper and zinc in the catalyst production wastewater are efficiently recycled, the copper and zinc ion recovery rate reaches 95% or above, the technological conditions are simple and stable, no additional agent exists, pollution and toxicity are avoided, and the economic benefits are remarkable.

The invention discloses a method for calculating the optimal excavation slope ratio of a mine slope. The method comprises the steps: taking a mine slope as a research object, and establishing a multi-objective optimization nonlinear mathematical programming model of mine slope stability safety and excavation economy, wherein the model takes the maximum value of the safety coefficient and the maximum value of the excavation benefit as objective functions at the same time; taking the excavation slope ratio and the shearing force and the normal force of the structural surface as decision variables, and taking the balance equation constraint condition of the slope slip mass and the yield condition of the structural surface as constraint conditions, wherein a gravity function constructed in the constraint conditions can change along with the change of the excavation slope ratio; therefore, the constraint condition of the limit balance of the slope slip mass can be well related to the safety and the economy of the mine slope, and the actual mine slope excavation requirement is better met; by means of the method, the optimal excavation slope rate of the mine slope can be directly obtained, and the excavation benefit is the highest; meanwhile, the stability safety coefficient is the maximum, and then the unification of excavation economy and stability safety is achieved.

The invention discloses a manufacturing method of a graphite-containing high-speed steel roll and belongs to the technical field of mechanical casting. B and N chemical elements are introduced into a conventional high-speed steel component, and MC type and / or M2C type dotted and / or blocky high-hardness alloy carbide, nitride and boride with the total percentage of the area being 20%-35% are / is distributed in a matrix structure of a work layer; graphite is separated out of original tissue through two steps including modification of carbide, nitride and boride and metamorphic inoculation of graphite, so that the high-speed steel roll not only reserves the advantage of peculiar high-temperature wear resistance of conventional high-speed steel, but also solves the problem that an original conventional high-speed steel roll has a large friction coefficient, the wear-resisting property of the high-speed steel is sufficiently played, the lubricating function between the roll in rolling and a workpiece is realized, and the steel bonding phenomenon is prevented; by means of the heat conductivity and lubrication characteristics of graphite, the defects that high-speed steel rolls are sensitive to heat shock and heat cracking and are prone to steel bonding and surface texturing can be overcome, and particularly, when the graphite-containing high-speed steel roll is used in a finished rack, the brightness degree of the surface of the roll material is remarkably improved.