112 results about "Long term safety" patented technology

A special controlled-release fertilizer for long-acting corn and its preparation method. The fertilizer core accounts for 80-92% of the total weight of the fertilizer, wherein the weight sum of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer calculated by pure nitrogen, phosphorus pentoxide and potassium chloride is the fertilizer 25%-50% of the total weight, the weight ratio is: 2-4:1-2:1-3; the coating coating accounts for 8-20% of the total weight of the fertilizer, including: 69.5-93% sulfur, 530 % polyethylene wax, 0.5-2% leveling agent. Melt sulfur, add montmorillonite and stir evenly, then add leveling agent, stir evenly to form molten sulfur. The molten sulfur and polyethylene wax are simultaneously sprayed on the surface of the fertilizer core to form a slow-release coating layer. The process occupies less land, requires less investment in equipment, and consumes less energy. It has the characteristics that one fertilization can meet the nutrient needs of corn throughout the growth period. The fertilizer effect is long and safe, and fertilization is simple.

An implantable ischemia detection system in which a white LED (105) produces a continuous, visible, broadband light illuminating a target site (125). Light backscattered by the target is collected by a sensor (155), allowing for an index of ischemia to be determined, and subsequently transmitted by a sending unit (167). Power is provided by an internal power source (179). The entire implantable device is encapsulated by a biocompatible shell (102) to add long-term safety with regard to implantation.

An implantable ischemia detection device in which a broadband light source produces a continuous, visible, broadband light illuminating capillary sites within a well localized target tissue is provided. Light backscattered by the target tissue is collected by a sensor, allowing for an index of ischemia to be determined, and subsequently transmitted by a sending unit. Optionally, the device may be provided with an internal power source, the entire device encapsulated by a biocompatible shell to add long-term safety while implanted at a target tissue site.

A storage device of car event data recorders is revealed. The storage device of car event data recorders includes at least two sets of memory or at least one memory set with at least two memory areas. The first memory module (or area) is used to record real time audio/video data with continuous attributes while the second memory module (or area) is for retrieving and recording audio/video data at the time of the accident and/or pre-alarm audio/video data before the accident and/or post-alarm audio/video data after the accident. The interval before or after the accident may be a few decades of seconds. Thereby the storage device of car event data recorders can perform long-term safety control operations and completely record real time audio/video data during, before and after each event. Therefore, certain audio/video data is stored for long-term preservation and checked. Thus the efficiency of the storage device of car event data recorders is improved.

The invention belongs to the technical field of buildings and traffic bridges, and particularly relates to a method for recognizing the load of a single vehicle passing through a multi-girder type bridge. According to the method, the weight of the vehicle is back calculated through response of the bridge when the vehicle passes through the bridge; the axle weights of all shafts of a large car are obtained according to an axle load distribution ratio after the weight of the vehicle is obtained; goodness fit is conducted on the total weight of a small car and the axle weight of the large car, and the distribution and the parameters obeyed by the vehicle weight and the axle weights are obtained; the distribution of the axle weights of all axles of the large car is obtained, and a vehicle model better meeting the reality is set up; the response of the bridge is obtained under the effect of the vehicle load, the Monte Carlo method or other methods can be used for generating a random traffic flow meeting the local reality, generated random vehicles are analyzed, the safety condition of the bridge under the normal traffic operation condition is evaluated, and a basis is provided for long-term safety evaluation of the bridge.

To provide high energy density, good cycle properties and rate characteristics and long-term safety of a lithium ion battery containing at least an ionic liquid and a lithium salt. The above problems are solved by suppressing reduction and decomposition of the ionic liquid on an anode by using a graphite coated with an amorphous carbon or onto which an amorphous carbon is deposited as an anode active material.

The invention discloses a method for determining a long-term strength parameter of surrounding rock of an underground water seal petroleum storage cavern. The long-term strength parameter of the underground water seal petroleum storage cavern is calculated through a stress-strain isochronous curve or a rheological rate in a constant-speed steady-state rheological stage according to rheological test data, obtained from triaxial rheological mechanics tests, of a rock sample. According to the method, a relatively actual long-term strength parameter can be obtained by fully considering a stress-seepage flow coupling effect for judging the stability of the surrounding rock of a cavern group. The method is actual and reliable, in the method, the stress-seepage flow coupling effect is fully considered for the first time during the determining of the long-term strength parameter of the surrounding rock of the underground water seal petroleum storage cavern, and the value of the long-term strength parameter is smaller than a value of a long-term strength parameter obtained without considering the seepage effect, relatively accurately reflects the characteristic of the surrounding rock of the underground water seal petroleum storage cavern, and has a reference value for accurately evaluating the long-term safety stability of the underground water seal petroleum storage cavern.

The invention discloses a shield tunnel pipe piece designing method taking double-liquid synchronous grouting layer performance degradation into consideration. The method comprises a first step of determining different distributing patterns of gel calcium silicate in cement-water glass double liquid based on careful observation and analysis, a second step of calculating occurrence frequency, occupied area proportion and structural effect influence coefficient of the gel calcium silicate in different distributing patterns, a third step of carrying out discount calculation on the mechanical property of the cement-water glass double liquid which is degraded by the gel calcium silicate according to a calculated result, and a fourth step of calculating the internal force and the deformation of a shield tunnel pipe piece lining structure by the adoption of the modified routine method. By means of the method, an accurate and effective evaluation can be carried out on the long-term mechanical property of the cement-water glass double liquid which is degraded by the gel calcium silicate which is a reaction product of the double liquid, then the evaluation is carried out on the long-term safety performance of a tunnel structure and other building structures using the cement-water glass double liquid, the method is used for designing shield tunnel pipe pieces, and the result is realer and more reliable.

The invention discloses a supercritical unit CCS side primary frequency modulation method. The method comprises the following steps: 1, the sum of an AGC power instruction and a primary frequency modulation power change requirement value is solved; 2, the sum value acquired in the first step and a power lower limit value are compared, and the larger value between the two is taken; and 3, the larger value acquired in the second step and a power upper limit value are compared, and the smaller value between the two is taken as power instruction output. Thus, the unit primary frequency modulation function can achieve long-term safety input, the unit primary frequency modulation performance is excellent, an important role is played in safety and reliability of a power grid and a power plant, frequency modulation requirements by the power grid can be fully met, and on the above premise, speed control system modeling work of the unit of the kind can be developed smoothly.

The invention belongs to the technical field of well drilling and discloses an underground natural gas storage injection-production pipe column designing method. By comprehensively considering the influence on a pipe column from self weight of a pipe body, the temperature effect, the pressure effect and the friction effect generated by fluid flowing, on the basis of design of an existing pipe column, compression loads are considered and matched with the compression efficiency of a pipe column connector to design an underground natural gas storage injection-production pipe column, it is ensured that the compression efficiency of a connector of the designed pipe column meets the operation compression load and sealing requirements, and meanwhile as the triaxial stress of the pipe column is considered for design, the overall structural intensity of the injection-production pipe column can meet the operation load requirement. The underground natural gas storage injection-production pipe column designing method not only can meet the airtightness under stretching loads, but also can meet the airtightness of the pipe column after stretching and compression loads interchange, improve the sealing performance of the pipe column under the interchanged loads and ensure long-term safety operation of the injection-production pipe column.

The invention discloses a method for safety precaution of a producing area of a farm product for a long term, which comprises the following steps: taking a standard data of producing area environment of a non-polluted farm product, a product standard data and a background data of actual environment of the producing area as basis to construct a weight matrix of indexes influencing composite index of the producing area environment; calculating composite index of respective year of the producing area through historical actual measurement data of the producing area environment; and finally outputting a line graph of the composite index and a predictor formula of the producing area by using a double exponential smoothing method of a time sequence so as to carry out prediction and warning of composite index and the deterioration speed of a producing area of a future farm product. The method discloses a law that the producing area safe condition changes along with the time through the historical data of the time sequence and predicts the future, has high reliability and accuracy, can carry out prediction and prewarning of an evolution trend, the direction and the speed of the producing area safety of different areas, and can make foreseeable judgment on a system and the like so that pertinence measures are taken, alarming source is eliminated, and agroecosystem safety can be ensured; and the method has wide applicability.

The invention discloses a compound coating coronary medicament eluting stent and a preparation method thereof. The compound coating coronary medicament eluting stent comprises a supporting naked stent, a phosphorylcholine polymer coating and a degradable medicament carrying polymer coating, wherein the phosphorylcholine polymer coating is coated on the surface of the naked stent; and the degradable medicament carrying polymer coating is coated on the surface of the phosphorylcholine polymer coating. The stent is transplanted at a lesion position in the bodies of the coronary disease patients, the outer degradable medicament carrying polymer coating gradually degrades and releases the loaded medicament to restrain the blood restenosis caused by smooth muscle proliferation in the blood vessels, after the outer medicament carrying coating degrades completely, the stent of the phosphorylcholine polymer coating is left, the pseudo membrane characteristics of the phosphorylcholine radical makes the metal stent more biocompatible, so cell coverslips are increased, the poststage coalescence of the stent and the blood vessel is promoted, stent endothelialisation is promoted, and better curative effects and long-term safety are provided.

The invention discloses a mould casting type flexible direct-current cable soft joint reaction force cone structure designing method. The method is characterized by comprising the following steps: (I) determining the parameters of a cable conductor, and calculating the temperature difference between the insulating inner and outer surfaces of a direct-current cable body; (II) calculating the electric field intensity at the center of a direct-current cable insulation layer; (III) calculating a direct-current cable soft joint reaction force cone curve equation; and (IV) obtaining a reaction force cone structure to obtain the specific structure of the cable soft joint. The method has the following advantages: the problem of electrical resistivity mismatching between the cable body insulation material and the mould casting insulation material and consequent field intensity accumulation at the interface of the two are avoided; meanwhile, the influence of temperature and electric field factors on the electrical resistivity is considered, electric field distribution in flexible direct-current cable terminal insulation is proposed, and a theoretical basis is provided for designing a flexible direct-current cable soft joint; uniform electric field at the flexible direct-current cable soft joint is guaranteed; and the electrical property requirement of the whole flexible direct-current cable system on the joint is met, and long-term safety and reliability of the flexible direct-current cable system are guaranteed.

The invention relates to an all-backheating drainage system of a heat supply network heater for a supercritical concurrent boiler thermal power plant. Condensed water in a condenser passes through a shaft seal cooler of a condensed water system and then enters into a condensed water precision processing device; a drainage water cooling section is arranged in the heat supply network heater, and drainage water in the heat supply network heater is cooled by the drainage water cooling section; the cooled drainage water is boosted by a drainage pump, then passes through a drainage water cooler and exchanges the heat with condensed water from the condensed water precision processing device in the drainage water cooler; the heat-exchanged drainage water and the condensed water from the shaft seal cooler of the condensed water system are mixed to enter the condensed water precision processing device; and the condensed water from the condensed water precision processing device returns to the system after heat exchange, therefore, the desalting of more than 80 percent of a unit steam-water system through a chemical processing system is ensured, the boiler feedwater quality is ensured, and the long-term safety operation of a supercritical concurrent boiler and the heat exchange between the drainage water of the heat supply network heater and the heat supply network are also ensured; and compared with schemes of partially recovering the heat and then discharging the heat to the condenser, the invention improves the efficiency by a larger extent.

The invention discloses a long-term monitoring method for bridge structural stress. The method comprises the steps: monitoring the structural stress of a bridge through a pre-embedded sensor and a surface mounting sensor; respectively building stress-time curve of the pre-embedded sensor and the surface mounting sensor to seek a correlated parameterization function of two stress-time curve; and reversely educing the stress of the bridge structure under the action of dead load and live load by combining the stress result of the surface mounting sensor and the correlated function, after the pre-embedded sensor is ineffective. The invention has the advantages that the method analyzes and induces the correlation obtained by two stress monitoring means of the pre-embedded sensor and the surface mounting sensor, realizes the complementary advantages of the two stress monitoring means, and realizes long-term safety monitoring for the bridges in operation period.

A spring coil and a preparation method thereof. The spring coil is formed by a winding wire strand. The wire strand comprises a degradable material and a radiopaque material that are processed to form an integral structure. A volume of the radiopaque material accounts for less than 10% of a volume of the wire strand. After the spring coil is implanted, biological materials induce a thrombus to form and organize. As the biological materials degrade, an aneurism gradually shrinks, and is finally reduced to less than 10% of an original size. The spring coil can accelerate healing, solving problems of long-term safety and space occupying effect of a bare metal spring coil in a body.

The invention discloses a preparation method for a zirconolite type manmade rock. The preparation method is characterized by comprising the following steps: preparing materials from CuO powder, CaO powder, Ti powder, TiO2 powder and ZrO2 powder; performing dry-process ball-milling on the raw materials, uniformly mixing the raw materials and enabling the raw materials to pass through a 100-mesh sieve; feeding 10-50g of the mixed materials into a stainless steel mould, and pressing the mixed materials into cylindrical blank; introducing the blank into a self-propagating quasi-isostatic device, igniting the blank through a tungsten filament to react, and applying pressure of 50-200MPa after the combustion reaction is ended, thereby preparing the high-compactness zirconolite type manmade rock. The preparation method disclosed by the invention can be used for synthesizing the zirconolite type manmade rock within several minutes by adopting a self-propagating high-temperature combined quick compacting process, has the advantages of being high in synthesis speed, high in efficiency, high in reaction temperature, high in product purity, low in energy consumption, simple, and the like; the prepared zirconolite type manmade rock is suitable for long-term safety solidification treatment and disposal of actinide in high-level waste.

The present invention provides a pre-embedded/pre-built-in hole creating apparatus for buildings, including: a pipe casing for a pipe or a pipeline system of the building to pass there through; at least one thermal-expandable foam detachably accommodated within the pipe casing; an inspection annulus detachably joined with the pipe casing; and a slide cover installed onto the pipe casing and secured to the building structure. The at least one thermal-expandable foam in the hole creating apparatus embedded in the building structure can be removed via the detachable structure for inspection and replacement so as to maintain the flame-retardant function of the hole creating apparatus. Said apparatus further includes an annular shielding plate providing functions of airtight and smoke blocking for the through pipes as well as includes an identifying device providing information, tracking and service associated with the apparatus in order to guarantee long term safety.

The invention relates to an intracranial drug eluting stent system and a preparation method thereof, in particular to an intracranial drug eluting stent used for treating the intracranial atherosclerotic stenosis disease .The intracranial drug eluting stent is composed of a metal stent body and a coating structure covering the surface of the metal stent body, the coating structure comprises one or more stent substrate coatings and drug coatings, and the drug coatings contain a biodegradable drug carrier and a drug inhibiting excessive proliferation of VSMCs .According to the intracranial drug eluting stent, the diseased artery is expanded with the stent to improve intracranial artery blood perfusion, the drug carried by the stent can prevent excessive proliferation of endangium, and thus the probability of in-stent restenosis is lowered; meanwhile, stent healing in the artery can be rapidly achieved, and thus long-term safety and effectiveness are ensured for patients.

The invention relates to a soil passivation restoration agent and a preparation method thereof. Melamine wide in source is used as a core, the cost is low, the characteristic that phosphonyl groups have strong heavy metal ion chelating effect is utilized to design the soil passivation restoration agent provided with 30 phosphonyl radical groups, the phosphonic acid radical groups in the soil passivation restoration agent are far greater than that in existing soil passivation agent molecules in number, and the soil passivation restoration agent is strong in chelating effect, big in molecular space volume and difficult to migrate, has the good performance of stabilizing heavy metals in soil and good acid and alkali resistance capability, meets the long-term safety requirement of the soil, meanwhile is mild in reaction condition, facilitates a large-scale preparation method, is applied to the fields of restoration of industrial and mining heavy metal soil and paddy field and the like and has wide prospect.

The invention provides a method for directly determining long-term strength of a rock mass by quick creep test. The method comprises the following steps of (1) performing graded loading creep test on the studied rock mass, so as to obtain a graded loading creep test curve of the rock mass; (2) according to the graded loading creep test curve, judging the minimum load value of viscous plasticity deformation; (3) for the test curve with viscous plasticity deformation, using a creep deformation formula to fit, so as to obtain the viscous plasticity deformation rate; (4) according to the relationship between the viscous plasticity deformation rate and the stress level, extrapolating to obtain the stress when the viscous plasticity deformation rate is 0, namely the long-term strength. The method has the advantages that the creep test time can be shortened, the long-term strength of the rock mass can be directly determined by the graded loading creep test curve, the artificial judging of inflection points is not needed, and then a reliable basis is provided for the long-term safety evaluation of the rock mass structure.

The invention is a photoelectric compound railway digital signal cable, comprising a cable core, which comprises plural groups of signal lines, where at least a group of signal lines is an inner-screened four-line group and at least another group of signal lines is a group of loose tube optical-fibers, gaps between signal lines are filled with water stop ointment, the cable core is coated in order with inner jacket layer, outer water stop belt, aluminum jacket layer, metallic armouring layer, and outer jacket layer, the outer water stop belt is made from water soluble expansive material, and water stop glue is filled between the metallic armouring layer and aluminum jacket layer. And it can ensure long-term safety and reliability of railway digital communication and be maintained without aeration, largely saving the operating cost.

A prestressed anchor bolt interface shear stress measurement device, comprising a rod body, a PVC pipe arranged parallel to the rod body above it for the introduction of wires, and at least one PVC pipe ring connected to the PVC pipe and nested on the outside of the rod body at intervals. Rectangular holes are set on both sides of the PVC pipe ring. The rod body includes an inner anchorage section extending into the surrounding rock and a free section extending out of the surrounding rock. Strain gauges are pasted on both sides of the rod body corresponding to each position where the PVC pipe ring is installed. Ⅰ, and thin steel bars are hinged at this position. Strain gauges Ⅰ are distributed on the inner anchorage section of the rod body according to the test requirements. , The contact parts of the PVC pipe ring and the PVC pipe are all provided with reserved holes for wires to pass through, and the external strain gauges are respectively connected to the strain gauge I and the strain gauge II through the wires. It provides help for better research on the long-term safety and durability of geotechnical prestressed anchorage structures.