1242 results about "Retention rate" patented technology

An electronic commerce system integrating plurality of content provider servers with plurality of merchant servers having integration server communicating request for commercial transaction to at least one merchant server, thus enabling the user of the client computer connected to the content provider server to initiate commercial transactions to at least one merchant server without being redirected to the merchant server away from the content provider server. The system increases customer retention on the content provider server, thereby increasing incentive for content providers to join the commerce system, thereby increasing the number of sites advertising products offered by merchants. The system also simplifies integration of multitude of servers, thereby reducing cost and time required for such integration.

A business intelligence and data management system is disclosed comprising a database for storing multi-dimensional business data from multiple online educational institutions; a usage tracking engine for recording within a user profile the time and duration of access to disparate system features. A reporting engine provides periodic and custom reports and a benchmarking engine facilitates comparison of internal institution data with aggregate data from multiple institutions, to compare student retention, course completion, student satisfaction, and student performance. The reporting engine provides reports on course retention rates, course evaluations, faculty evaluations, enrollment, student performance, and course run rates. The usage tracking engine, benchmarking engine, and reporting engine facilitate determination of best practices to improve student enrollment, student retention, course completion, student performance, and student satisfaction. A custom query engine facilitates freeform searches of business data and a data mining engine provides access to detailed data supporting the periodic reports.

A method of providing a rate guarantee to individual or groups of flows in a router through intelligent management of buffers. Rate guarantees are provided by intelligently allocating and isolating the buffers available to each flow. In its most basic form, the method applies to output queued network devices with a simple FIFO scheduler, where a number of streams some with rate reservations are sought to be multiplexed onto an outgoing link. The method involves strictly partitioning the buffer into portions strictly reserved for each flow in proportion to its link reservation. This ensures that each stream obtains the link reservation rate in a scalable manner. A particular embodiment of the invention allow for a portion of the buffer to be strictly partitioned while allowing streams full access to the remainder of the buffer. Other embodiments utilize the use of a link scheduler to divide bandwidth amongst a number of queues, while using buffer management to facilitate bandwidth amongst a number of flows in each queue.

An anode active material is provided. The anode active material includes a silicon thin film containing crystalline silicon having a Raman shift in a Raman spectrum ranging from about 490 to about 500 cm−1 and a full width at half maximum (FWHM) ranging from about 10 to about 30 cm−1. The volume of the anode active material does not change significantly during charging and discharging. Thus, a lithium battery employing the anode active material has an excellent capacity retention rate and a longer cycle lifetime.

A method and system for determining a useful life of financial instruments, such as financial assets and liabilities. A dynamic calculation of a first retention rate is performed for each of several financial assets; a steady-state calculation of a second retention rate is performed for the financial assets; and the first and second retention rates are combined to determine a predicted useful life of the combined financial assets.Optionally, one of several variables affecting at least one of the retention rates is selected. A sensitivity of financial asset variables to other financial asset variables is determined. Scenarios are forecast, extrapolated from the retention rate. The financial assets may include deposits and / or financial instruments. Outliers in the financial assets may be checked, in one variation of the invention. Exogenous variables may be included in at least one of the calculations. The exogenous variables are selected from the set including seasonal variables, day-of-the-month variables, treasury interest rates, deposit rates, local unemployment rate, local personal income, and local retail sales, and the like. Interest rate spread may be included in at least one of the calculations. Forecast scenarios may include future values for use in at least one of the calculations. The future values may be selected from the set including forecast treasure rates, forecast horizon, forecast deposits, forecast retention rates, and forecast interest rates, and the like.

The invention provides a high-temperature resistant environment-friendly polyvinyl chloride material for wires and cables. A raw material formulation mainly comprises the following materials in weight portion: 80 to 120 portions of loose-type polyvinyl chloride resin, 20 to 55 portions of tetraoctyl pyromellitate, 5 to 35 portions of polyester plasticizer and 12 to 18 portions of calcium-zinc stabilizer, wherein the polymerization degree of the loose-type polyvinyl chloride resin is between 2,000 and 3,000; in the calcium-zinc stabilizer, the total content of lead, cadmium, mercury and hexavalent chromium is less than or equal to 10 ppm of the total weight of the calcium-zinc stabilizer; the polyester plasticizer is polypropylene-1, 2-glycol adipate or polypropylene-1, 3-butylene terephthalate; and the molecular weight of the polyester plasticizer is between 3,000 and 4,000. After the material is aged in a hot-air oven for 168 hours at 158 DEG C, the retention rate of tensile strength is up to 106 percent; the retention rate of elongation at break is 97 percent; and the material is good in mechanical physical properties and insulating property. Therefore, the material meets the temperature-resistant requirement on long-term operating temperature at 125 DEG C in UL1581.

A thermal bonding conjugate fiber constituted from a first component comprising a polyester resin and a second component comprising a polyolefin resin with a melting point lower than that of the polyester resin by not less than 20° C., characterized in that a post-heat treatment bulk retention rate thereof is 20% or more when calculated by the following measurement method: Bulk retention rate=(H1 (mm)2 / H0 (mm))×100 (%) (wherein H0 is the web height when a 0.1 g / cm2 load is applied to a web with a mass per unit area of 200 g / m2; and H1 is the web height after a heat treatment for 5 min at 145° C. when a 0.1 g / cm2 load is applied to that web).

The invention discloses a power battery life prediction method. The power battery life prediction method comprises the following steps: determining battery capacity fading stages according to battery cell life decay rate; establishing a capacity fading model for capacity retention rate with chemical reaction rate and time; obtaining a cycle life decay module and a calendar life decay module in combination with the battery capacity fading stages; training the cycle life decay module and the calendar life decay module on the basis of battery cell test data and determining parameters in the models; generating a cycle life decay curve and a calendar life decay curve according to the cycle life decay module and the calendar life decay module; superposing the two curves in a predetermined ratio to obtain a battery life prediction curve. On the basis of Arrhenius equation an internal resistance increase principle, multiple variables are provided for comprehensive consideration, and the battery life prediction curve bettering meeting the actual use conditions of a battery is obtained, so that larger prediction errors are effectively avoided, and the accuracy of a prediction model is improved substantially.

The invention relates to a method for increasing the retention rate of calcium carbonate in paper-process reconstituted tobacco sheets. The purpose of the invention is to solve the problems that: since the prior art directly adds calcium carbonate, the bonding force between the calcium carbonate and tobacco fibers is weak, as a result, loss is severe, the material utilization rate is low, the amount of waste water to be treated is large, and the treatment cost is high. The technical point is that: needed chemical constituents are extracted from tobacco material, residue is ground into pulp after extraction, and the concentration of the pulp is regulated between 3 percent and 25 percent; the solution of soluble carbonate accounting for 4 percent to 40 percent of the weight of dry fibers in the pulp is added into the pulp, and is fully stirred and uniformly mixed, and impregnation is then carried out for 20 to 150 minutes, so that the fibers of the pulp can be impregnated with the soluble carbonate; the solution of soluble calcium salt, the molar mass of which is approximately equal to the molar mass of the soluble carbonate, is added into the impregnated pulp, and is fully stirred and uniformly mixed, static reaction is then carried out for 30 to 180 minutes, and the reaction temperature is controlled at 5 DEG C to 50 DEG C; and after the static reaction, the pulp is made into reconstituted tobacco sheets by papermaking equipment.

The invention discloses a method for rapidly recognizing a life decline characteristic of a power battery system. Based on a pre-established relationship between a polarized internal resistance increase rate and a capacity retention rate, voltage and current data for parameter recognition are acquired under an actual operating condition of an electric car, on-line parameter recognition is performed by a vehicle-mounted computer, and the actual capacity of a battery can be obtained on line without full charge, full discharge or other operations on the battery; the polarized internal resistance increase rate and the capacity retention rate are used as an input and an output, so that influence of inconsistency of the internal resistance and the capacity between batteries on capacity prediction is avoided. The recognized model internal resistance parameters can be not only applied to capacity estimation, but also applied to SOC estimation and the like.

A new routing protocol for routing service requests in a contact center is provided that takes into account the results of games played by the agents and the game actions of the agents. The system communicates the game to the agent. Agents in turn select game actions. The results of the agent games and the agent actions in these games help determine which agents handle the different types of service requests. The routing protocol takes account of those game results and actions while still routing calls in a systematic, coordinated and efficient manner. Additionally, by dynamically restructuring the game, management may communicate incentives dynamically to agents to incentivize agents to change their game actions in ways that lead to call routing following management priorities. Management may further influence routing by adjusting management preferences, which may be taken into account along with agent game results and game actions when routing calls. By incorporating agent game results and game actions in the routing scheme, agents are engaged and entertained, so that their work is less boring and monotonous. The agents are also given more control over their work, thus tending to increase job satisfaction and therefore agent retention and contact-center performance.

The present invention provides an electrolyte solution and a lithium ion secondary battery which maintain for a long period high battery characteristics represented by the discharge capacity retention rate after the charge / discharge cycle, and simultaneously achieve also the high safety represented by the flame retardation. The present invention provides an electrolyte solution containing a nonaqueous solvent, an electrolyte, a specific compound having a perfluoroalkyl group in the molecule, and an additive having a fluorine atom and / or a phosphorus atom in the molecule.

The invention discloses a preparation method for a negative electrode material with a core-shell coated structure and for a lithium ion battery. The preparation method is simple in process and easy to control. The preparation method comprises the following steps: preparing a graphene oxide material; then preparing a core-shell-structured carbon-coated silicon material from nanometer silicon; blending graphene oxide with carbon-coated silicon powder according to a certain ratio; after uniform blending, carrying out pumping filtration so as to obtain a two-dimensional film; and then carrying out thermal reduction so as to obtain the core-shell-structured carbon-coated silicon / graphene composite material. The electrode material prepared by using the method has initial charge and discharge capacities of 835.8 mAh / g and 1452.3 mAh / g respectively when current density is 200 mA / g and has charge and discharge capacities of 705.1 mAh / g and 710.9 mAh / g respectively after 100 cycles, so the electrode material has a capacity retention rate of 84.4% and good cycle stability.

The invention discloses a positive pole material of multiple composite lithium iron battery and a production method thereof, the technical issue to be solved is to improve electrochemical performances of the positive pole material, the positive pole material of the invention has the general formula: Li0.8-1.2NixCoyzO2, the crystal structure of the positive pole material is hexagonal system; crystal lattice is doped with more than one elements selected from the group consisting of Ti, Al, Mg, Cr, Zn, Ce, La, Lu, Y and F, the production method of the positive pole material comprises the steps of: synthesis of substrate materials, doping of substrate crystal lattices, mixing with lithium source compounds, sintering. As compared with the prior art, the produced positive pole material of multiple composite lithium iron battery of the invention combines into the simulative battery with metallic lithium sheets, and discharges and charges at 0.3C of discharge and charge current density, when the discharge and charge voltage is 2.5-4.2V, the maximum discharge capacitance reaches over 160mAh / g, the first Coulomb efficiency reaches more than 90%, the capacitance retention rate after circulation for 100 weeks is above 92%, the costs of raw materials and production are low, accordingly, the invention is apt for large-scale industrial production.

The invention relates to a high-temperature-resistant wave-transparent silicon nitride fiber-reinforced composite material and a preparation method thereof. The method comprises the following steps: by using a two-dimensional fabric laying or three-dimensional four-direction knitted continuous silicon nitride fiber preform as a reinforcing body, carrying out interface coating preparation on the reinforcing body fiber surface with a polyboron azane precursor by half-vitrification; compounding the precursor mainly composed of polyboron azane with an impregnation liquid to prepare a base; and carrying out vacuum pressure impregnation, desolventization, pressure crosslinking curing and cracking densification to obtain the final silicon nitride fiber-reinforced composite material. The preparation method greatly enhances the impregnation efficiency, enhances the material density by 18-40%, and finally obtains the novel wave-transparent material system with excellent high temperature resistance. The strength retention rate of the material at 1200 DEG C and 1500 DEG C is 70-94%. Compared with the silicon nitride ceramic material, the novel wave-transparent material has obviously higher breaking strain.

Provided is an electrode mix for a secondary battery containing an electrode active material, comprising a PVA having a degree of polymerization of more than 2500 and a degree of saponification of more than 90% as a binder, and a lithium secondary battery comprising the same. Use of the binder according to the present invention can provide advantageous effects such as improved adhesive strength between the electrode mix and current collector and between the electrode mixes, prevention of the peeling and separation of the active material even after repeated charge / discharge cycles, and inhibition of decreases in the capacity or output power retention rate of the secondary battery.

The invention discloses a biology base polymer aerogel oil absorption material. The oil absorption material is prepared by the following steps: at first, crosslinking biology base polymers by a crosslinking agent, to obtain a precursor liquid, then freeze-drying the precursor liquid to obtain aerogel, and finally grafting silane onto the aerogel surface to obtain the hydrophobic biology base polymer aerogel oil absorption material. The density of the oil absorption material is 3.8 to 23.1 kg / m3. The water contact angle is at least 117.8 degrees. The adsorption capacities on gasoline, paraffin oil, chloroform, and crude oil are 30.5-109.0 g / g, 33.2-131.2 g / g, 58.2-163.0 g / g, and 24.7-95.8 g / g. After 50 times of gasoline adsorption-extrusion circulation, the retention rate of adsorption capacity is 43 to 99%. The disclosed aerogel oil absorption material has the advantages of large oil absorption capacity and high oil absorption efficiency. Moreover, the oil absorption material can be repeatedly used by simply extruding the oil absorption material, while a high retention rate of adsorption capacity can be maintained. At the same time, the raw material sources are wide, the raw materials are cheap and easily available, the preparation is simple, the technology is matured, the method is environment-friendly, and the requirements of sustainable development can be met.

The invention provides a nickel-rich concentration gradient type lithium nickel cobalt aluminum oxide positive pole material, a preparation method thereof and a lithium ion battery. The nickel-rich concentration gradient type lithium nickel cobalt aluminum oxide positive pole material has a near-spherical appearance and a core-shell structure, wherein the content of Ni element in an inner layer is high, the content of Mn element in an outer layer is high, bulk molybdenum element doping is performed, and the surfaces of particles are coated with aluminum oxide. The reversible discharge capacity of the nickel-rich concentration gradient type lithium nickel cobalt aluminum oxide positive pole material provided by the invention under the current density of 350mA / g is more than 172mAh / g, and the capacity retention rate after 100 times of charge and discharge cycles at the rate of 2C is more than 85%. The lithium ion battery which takes nickel-rich concentration gradient type lithium nickel cobalt aluminum oxide as the positive pole material has the prominent advantages of high capacity, good thermal stability, good cycling stability, excellent rate property and the like, and has broad application prospects in the fields of electronic equipment, communication, transportation and the like.

The invention discloses a method for preparing a stannic oxide battery anode material on a carbon nano tube by using an electro-deposition process. The method comprises the steps of: making electro-deposition solution, treating the solution with water bath, preparing the carbon nano tube pole piece, pressing on a foam nickel base, putting the base carrying the carbon nano tube pole piece into the electro-deposition solution so as to perform vacuum treatment, and then perform the electro-deposition treatment under a constant current on the vacuumized pole piece so as to acquire the battery anode material on the carbon nano tube carrying the stannic oxide. The battery anode material prepared by using the method has higher power property and has a quality specific capacity kept between 350 and 450 F / g under a high scanning speed of 200 mV / s. The material applied in a super capacitor has higher volumetric properties, excellent cycling stability and long cycling life, first discharging specific capacity ranged between 410 and 588 F / g under a constant current density of 15 A / g, cycling times more than 5000 times and specific capacity retention rate ranged between 90 to 95 percent.

An e-learning system provides learning content and interactive learning games to users using computer. The e-learning system includes an authoring system allowing the creation of customized learning content and interactive learning games. A content presentation module presents learning content to users. A data collection module receives user data indicating the user's performance with the interactive games. A user data presentation module analyzes the user data and presents a report including user data. The data presentation module may also present rankings of user data for interactive games. The interactive learning games are designed to reinforce and measure users' understanding of the instructional content provided by the content presentation module. While playing interactive games, access to corresponding instructional material can be enabled to enhance users' retention or disabled to assess users' knowledge. Open games can be used to calibrate user responses to model responses and to aggregate and evaluate users' suggestions.

The invention discloses a composite cathode material for a lithium ion power and energy storage battery and a preparation method thereof and a battery, which aims to solve the technical problem of improving high rate discharge performance of the battery. The composite cathode material is made up of composite particles obtained by combining hard carbon with natural graphite or the hard carbon with artificial graphite or the hard carbon with the natural graphite and the artificial graphite. The preparation method comprises the following steps: mixing the hard carbon and the natural graphite and / or the artificial graphite with a dispersant and water to obtain a mixture, drying and carrying out thermal treatment on the mixture to obtain the composite cathode material. The battery of the invention adopts the cathode material. Compared with the prior art, the first specific capacity of a battery cathode is more than 489.3mAh / g, capacity retention rate at 1C after 300 cycles is more than 95% at high temperature of 60 DEG C, and capacity retention rate at 1C after 300 cycles is more than 86% at low temperature of minus 30 DEG C. The composite cathode material has simple preparation process and low cost, and the cathode material is suitable for the lithium ion power and energy storage battery and the lithium ion battery for various portable devices, electric tools and electric motor cars.

The invention relates to a preparation method for composite graphite particles for a lithium secondary battery. The method comprises the following steps: 1, heating and kneading spherical natural graphite particles, adhesive capable of being graphitization, and graphitized catalyst to form a kneaded thing; 2, pressing the kneaded thing into block to form a formed kneaded thing; 3, under the protection of an inert gas, carbonizing the formed kneaded thing at the temperature of 800-1,500 DEG C, and cooling the kneaded thing to room temperature; 4, under the protection of the inert gas, allowing the formed kneaded thing to be subjected to catalysis and graphitization high-temperature processing at the temperature of 2,800-3,200 DEG C; and 5, performing classifying or screening after the kneaded thing is smashed. The invention further relates to composite graphite particles for the lithium secondary battery prepared by the method. The composite graphite particles have higher compacted density, large discharge capacity, good circulation performance, good electrochemistry performance, better high-current charge-discharge performance, and better safety, discharge platform availability and higher platform retention rate.

The invention discloses an immersion-resistant single-component deacidified organic silicon sealant composition and a preparation method thereof. The composition comprises the following components in parts by weight: 100 parts of alpha, omega-dihydroxy polydimethyl siloxane, 5-50 parts of fumed silica, 10-30 parts of polydimethylsiloxane, 5-15 parts of a crosslinking agent, 0.01-0.5 part of a catalyst, 1-5 parts of a waterproof agent and 0.1-1 part of a tackifier. The single-component deacidified organic silicon sealant has excellent adhesive property, and the safety and stability of the single-component deacidified organic silicon sealant in the using process are ensured; and the single-component deacidified organic silicon sealant still has excellent adhesive property with a base material after being subjected to long-term immersion or short-term high-temperature boiling treatment and is high in mechanical property retention rate and better in waterproofness as comparison with a common silicone sealant.

The invention discloses silicon dioxide coated phase-change microcapsules and a preparation method and an application thereof, wherein the phase-change microcapsules include a core material and a wall material; the core material includes a phase-change material, and the wall material is silicon dioxide; the enthalpy value retention rate of the silicon dioxide coated phase-change microcapsules is 20-99%; the average particle size of the microcapsules is 0.1-100 microns. Through a sol-gel reaction on an emulsion interface, the silicon dioxide coated phase-change material is obtained by one step; no toxic substances are generated in the preparation process, so the preparation process is green and environmentally friendly; the prepared phase-change energy-storage microcapsules are high in coating rate and low in damage rate, the supercooling degree of the phase-change material is effectively reduced, the obtained phase-change material has no volatile gases, the use is safe, and an application scope is expanded; the preparation method has the advantages of simple process, low cost, cheap and easily obtained used raw materials, and easily achieved industrialization. The phase-change energy-storage microcapsules can be widely applied to the fields of textile, building energy conservation, electronic part and component thermal management, waste heat recovery and the like.

The invention discloses a low smoke halogen-free flame retardant material applicable to a photovoltaic cable, and a manufacturing method of the material. The manufacturing method is simple in process and easy for industrial popularization and production, the produced material is a low-smoke environment-friendly product, is free of halogen, heavy metal or other substances harmful to the environment, and has good surface property, good insulation and excellent water resistance, acid-base corrosion resistance and high / low temperature resistance. 3MPa water resistance tests prove that the photovoltaic cable prepared from the material disclosed by the invention has the insulation resistance retention rate being greater than 98%; after the photovoltaic cable is soaked in 5% saline water at 90 DEG C for 14 days, the physical and mechanical property retention rate e of the cable material is greater than 80%; the test if rapid aging for 100 hours at 185 DEG C shows that the physical and mechanical property retention rate of the cable material is greater than 65%, and the extrapolation prolonged service life can be 25 years.

The invention relates a rapid prediction method of cycle life of lithium-ion battery, comprising the steps of conducting short-term test of cycle performance of battery to be evaluated for different cycle times, recording corresponding capacity retention rate of different cycle times; dismantling the battery and placing it in high temperature oven for baking until the electrolyte is dried and removed, utilizing quality minusing method to calculate retention rate of electrolyte after cycle; conducting fitting calculation according to test data of cycle times, capacity retention rate and electrolyte retention rate, to predict cycle life of battery. Compared with conventional cycle life test method, the invention is easy to operate and greatly shortens test period of cycle life, and compared with pure theoretical calculation and experience model prediction, the invention has higher universality and better consistency with actual test result.

The invention relates to a polyamide composition with high dimensional stability and a preparation method thereof. The polyamide composition comprises the following components in parts by weight: 60 to 90 of fatty polyamide composition, 2 to 10 of compatilizer, 1 to 10 of inorganic metal compound, 0 to 5 of polysiloxane with low molecular weight and 0 to 2 of auxiliary agent. The preparation method comprises the following steps of: premixing the raw materials in a high-speed mixer for 10 to 30min, controlling the temperature to be 40 to 60 DEG C, then adding premix into a double-screw extruder, conveying, melting, shearing, extruding, cooling and granulating so as to prepare a polyamide composition product with high dimensional stability. Compared with the prior art, the invention shows excellent dimensional stability and heat distortion temperature with high retention rate, is suitable for occasions with higher requirement to the dimensional stability, such as the panel of the air conditioner of an automobile, an instrument panel, a camera bracket, a sports apparatus and the like, and can be directly processed by injection molding or other forming methods.

The invention discloses a method for regenerating waste and old graphite anode materials. The method comprises the following step of: carrying out crushing, screening, impurity removal, coating, heat treatment and the like on the waste and old graphite cathode materials to obtain graphite anode material products. When the graphite cathode material is applied to an anode material of a lithium-ion battery, a first power generating capacity of the graphite anode material is higher than 320mAh / g, and 100-times circulation retention rate is 98.75 percent, and thus market requirements are met. The method for regenerating the waste and old graphite cathode materials, disclosed by the invention, has the characteristics of simple flow and high additional value and has remarkable economic benefits and social benefits.