92 results about "Withdrawal rate" patented technology

Computerized methods for administering variable annuity plans are disclosed. In certain embodiments, minimum payment features and mechanisms for adjusting current payments in response to cumulative payment totals are provided. Other embodiments provide withdrawal features under which certain guarantees are provided if withdrawals do not exceed predetermined withdrawal rates.

Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.

The present invention relates to a dissolvent with effective ingredient extracted from the plant-and-animal raw material and the extraction method thereof. One subcritical fluid extraction solvent includes an extraction solvent of a compound or composition extracted from the raw material containing compound or composition as component element, and the solvent is mainly characterized in that the liquid sulfur hexafluoride works as the extraction solvent. The invention also includes a method for extracting the subcritical fluid extraction solvent. The advantage of the invention is that the extraction and separation of the target component in the natural product are optionally executed to further increase the extraction rate of the intermediate product and the usage factor of the raw material while the unique dissolving character of the sulfur hexafluoride and the mixed solvent thereof to the liposoluble active ingredient is used. The physical features of strong dissolving capacity and low boiling point of the sulfur hexafluoride and the mixed solvent thereof are used to reduce the consumption quantity of the energy source, dissolvent of the system and the cost, and increase the market competition ability of the intermediate product.

Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.

The invention provides a method for improving recovery efficiency through huff and puffoil recovery of a tight oil fractured horizontal well. When reservoir pressure is reduced to a certain optimized pressure, the horizontal well is subjected to sand washing out and well flushing, water is injected into the reservoir at the specified daily water-injection rate, water injection is stopped when pressure at the end of injection life is maintained to be 100%, and then the accumulated water-injection rate is equal to accumulated fluid withdrawal rate in the previous production stage of the well; after water injection is ended, the horizontal well is closed and enters a closing-in stage to depend on imbibition replacement and other effects, so that crude reservoir oil enters a high-permeability channel; and during oil extraction, when formation pressure in the control area of the horizontal well is reduced to rated pressure, the well is closed, and second round of huff and puff oil recovery is performed. According to the method for improving recovery efficiency through the huff and puffoil recovery of the tight oil fractured horizontal well disclosed by the invention, crude oil in dense reservoir rock matrix pores developed in natural fracture is further extracted, the single well yield of an oil well is improved by comprehensively utilizing formation energy rising, injected water and crude reservoir oil imbibition replacement and other principles, and a new approach is developed for increasing the crude oil recovery rate of the dense oil reservoir.

The invention discloses an optical fiber preform manufacturing method which comprises the following steps: an upper laser of a first laser instrument measures the diameter d of a sandwich layer, a lower laser measures the top end shape P of a powder preform, and a system determines the withdrawal rate of the powder preform according to the top end shape P; an upper laser and a lower laser of a second laser instrument measure diameters of an upper point and a lower point of a coating layer respectively to further calculate the slope K of the deposition coating layer. An analytical system compares the differences between the actual parameters d1, P1 and K1 and the set parameters d0, P0 and K0 of the deposition powder preform. During the deposition process of the powder preform, a measuring system (a laser diameter measuring instrument), a control system and the analytical system are in closed cycle, the system is in real-time measurement, analysis and adjustment processes, and the deposition process can be controlled through the K value at the initial period when the top end shape of the coating layer deviates from the control mid-value so as to obtain the coating layer with uniform external diameter and improve the quality of the powder preform.

A casting method and apparatus are provided for casting a near-net shape article, such as for example a gas turbine engine blade or vane having a variable cross-section along its length. A molten metallic melt is provided in a heated mold having an article-shaped mold cavity with a shape corresponding to that of the article to be cast. The melt-containing mold and mold heating furnace are relatively moved to withdraw the melt-containing mold from the furnace through an active cooling zone where cooling gas is directed against the exterior of the mold to actively extract heat. At least one of the mold withdrawal rate, the cooling gas mass flow rate, and mold temperature are adjusted at the active cooling zone as the melt-containing mold is withdrawn through the active cooling zone to produce an equiaxed grain microstructure along at least a part of the length of the article.

The invention relates to a method for separating and purifying effective ingredients in a natural product. The method comprises the following steps: 1) extracting effective ingredients of the natural product; 2) removing impurities through membrane separation; and 3) purifying through adsorption. The beneficial effects of the invention are as follows: 1) the separation and purification technological processes are considered from an overall perspective, thus making up the defects of membrane separation in the aspect; 2) compared with the traditional 'water extraction and alcohol precipitation' method, the method of the invention uses water as solvent or adds a certain proportion of ethanol according to the characteristics of effective ingredients of the natural product; 3) compared with the ultra-low temperature freezing technology, the method does not adopt the ultra-low temperature state and is more convenient; and 4) compared with the supercritical or subcritical solvent extraction, continuous operation can be realized at room temperature without phase transition course, the technology is simple and is not harsh to devices, the extraction rate is higher, and the final product has high purity.

Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.

Separation methods for producing an extract and a raffinate from a solvent extraction feed material, wherein the feed material is derived from a process for recovering bitumen from oil sands. The methods may include producing an intra-stage recycle component from an overflow zone of a solvent extraction stage and recycling the intra-stage recycle component to the solvent extraction stage, and/or the methods may include providing an underflow component withdrawal rate for a solvent extraction stage other than a final solvent extraction stage which is greater than an underflow component withdrawal rate for the final solvent extraction stage.

The present invention provides an automatic sampling and dilution apparatus for use in a polymer analysis system. The apparatus comprises (a) a primary mixing chamber; (b) a primary pump capable of continuously withdrawing a variable viscosity liquid from a reactor at a selectable, fixed withdrawal rate over a varying viscosity range of about 50 to about 5,000,000 centipoise (cP) for continuously conveying the variable viscosity polymer-containing liquid into the primary mixing chamber; (c) a first dilution pump for continuously delivering a first dilution solvent into the primary mixing chamber at a selectable, fixed flow rate to mix with the variable viscosity liquid in the mixing chamber and thereby form a diluted polymer-containing liquid therein; and (d) a secondary pump for continuously conveying the diluted polymer-containing liquid into a flow-through detector. A polymer analysis system utilizing the automatic sampling and dilution apparatus is also provided.

The invention discloses a rotary shoulder technique for growing sapphire crystal by a kyropoulos method. In the sapphire growth process employing the kyropoulos method, the power is reduced to enter the shoulder stage after seeding of the crystal is finished; the crystal is kept in a rotary state at this stage, and meanwhile, the withdrawal rate of the crystal is kept; the diameter of the crystal is gradually enlarged along with an upward pulling process; rotation of the crystal is stopped when the growth weight achieves 8-10% of inventory; and the crystal enters an equant growth stage in a vertical pulling state. By adopting the rotary shoulder technique disclosed by the invention, vortex rotating along with the crystal is formed by flux on a solid-liquid interface along with rotation of the crystal; and an air bubble gathered on the solid-liquid interface is gradually discharged along with flow of the flux. Therefore, the content of the air bubble can be effectively reduced; the quality and the utilization rate of the crystal are improved; crystal sticking on crucible caused by over-quick crystal growth in one direction and uneven temperature field also can be effectively avoided; molding of the appearance of the crystal is facilitated; subsequent crystal manufacturing procedures are facilitated; the stick cutting rate can be improved; and the product usage is also improved.

The invention discloses a preparation method of oxideeutecticstructureceramic powder. The method comprises the following steps: preparing an eutecticmaterial with fine and uniform tissue through a laser floating zone melting technology, then preserving a microcosmiceutectic structure with strong interface bonding into eutectic powder through crushing and screening, and further preparing eutectic powder with certain particle size distribution, thereby effectively reserving an eutecticstructure in an initial eutectic sample into a sinteredeutectic crystalthrough reasonable collocation of lamellar spaces and eutectic powder particle size of the initial eutectic sample. Theoxideeutecticstructureceramic powder is in a typicaleutectic morphology; eutecticmaterials with different lamellar spaces are obtained by changing the withdrawal rate during a laser floating zone melting process; eutectic powder with differentparticle size distribution is obtained through the combination of the withdrawal rate and ball milling time.

The invention discloses a high-efficiency low-temperature wheat squeezing-cutting smashing milling process which comprises a shelling process, a sizing process, a reduction process, a tail grinding process and a purifying process. In the shelling process, four times of shelling are carried out, in the sizing process, two times of sizing are carried out, and in the reduction process, four times of reduction are carried out; a high-speed squeezing-cutting smashing machine is adopted for the third shelling, a minimum gap between a rotor pin and a stator pin of the high-speed squeezing-cutting smashing machine is 0.3 to 1mm, and a linear speed of the rotor pin on the outermost circle is 30m/s to 70m/s; the high-speed squeezing-cutting smashing machine adopted in the third shelling machines coarse bran flake produced in the second shelling. The invention further discloses a milling device using the high-efficiency low-temperature wheat squeezing-cutting smashing milling process. According to the invention, the milling process is redesigned; the third shelling, the fourth shelling and the first sizing adopt the high-speed squeezing-cutting smashing machine; a reduction system adopts a water-cooling high-speed squeezing-cutting smashing machine; germ extraction is carried out in the second sizing, so that a germ extraction rate of a production line is improved by at least twice, flour accuracy and a total flour extraction rate are improved, investment of the production line is greatly reduced, and original fragrance of the wheat is kept.

The invention mainly relates to a microwave continuous extraction process, belonging to pharmacy, food and chemical industry so on, which extracts material in microwave and evaporates and concentrates it in single-effect external cycle. It comprises a microwave extraction equipment (1), a collector for air foam (2) for collecting the foam generated in heating process to material, a filter (3) at the bottom of microwave extraction equipment (1), a concentration heater (5) connected with the filter (3) through a transporting pipe (12), a concentration and evaporation room (4) for heated extraction liquid by pressure and concentration differences, a cooling system (6), an oil-water separator (7) for cooling the gaseous available component and collecting aromatic stem oil material, a liquid storage tank (8), a vacuum pumping system (9) and a blow-off valve (10) set on the liquid storage tank (8). The whole extraction and concentration process is continuous and at the same time so that producing time, energy source and manpower are saved greatly. It is provided with high extraction rate, low using cost and it is the most advanced extraction and concentration process. It can extract continuously and also extract in cold-hot reflux.

The invention pertains to a process for producing methane by a two-stage anaerobic digestion of organic feed, comprising i) subjecting an organic feed suspension (a) to acidogenesis and methanogenesis in a first reactor (1); ii) withdrawing an effluent (b) from said first reactor and subjecting it to solid/liquid separation (2), thus obtaining effluents high (d) and low (c) in solids, wherein the volatile fatty acid (VFA) concentration in said first reactor is controlled by the withdrawal rate; iii) subjecting the effluent low in solids (c) to acidogenesis and methanogenesis in a second reactor (3), thus producing methane gas in said first and second reactor.

The invention discloses a stock prediction method and system based on reinforcement learning, and the method comprises the following steps: a, obtaining the historical data of a target stock, carryingout the normalization processing of the historical data, enabling all kinds of numerical values in the historical data to be zoomed to the same scale, and forming a training set; b, constructing a stock prediction model based on the reinforcement learning theory, wherein the stock prediction model comprises an input layer, a hidden layer and an output layer; inputting the training set into a stock prediction model for training; c, performing stock prediction by using the trained stock prediction model, and evaluating the stock prediction model on the basis of the summer general ratio and themaximum withdrawal rate. The method can achieve the purpose of predicting the stock price trend direction, helps a stock market investor to reduce the risk degree of stock investment, and obtains expected benefits.

The invention discloses a method for extracting a borneol camphor tree leaf crude extract. The method comprises the following steps of: mixing borneol camphor tree leaves and petroleum ether according to a material to liquid ratio of the petroleum ether to the borneol camphor tree leaves of 34-36 ml/g, and extracting at the temperature of 48-49 DEG C for 2 to 2.1 hours; and evaporating the obtained extract as the petroleum ether serving as a solvent, thus obtaining the borneol camphor tree leaf crude extract. The invention also provides a method for optimizing the borneol camphor tree leaf crude extract extraction method by response surface methodology. The following three variables are provided, namely the liquid to material ratio of the borneol camphor tree leaves to the petroleum ether, the extraction temperature and the extraction time; and optimization is executed according to Box-Behnken design by using design expert software. By the extraction method, the extraction rate of ice sheets can be increased, and consumption of solvents and resources is reduced, and production and emission of pollutants during production are reduced.