538results about How to "Reduce capacity requirements" patented technology

This invention proposes a method for completing an interval of an open-hole injection wellbore penetrating a subterranean formation, said wellbore being communicating with the formation by way of an interface that comprises at least a filter cake invaded zone comprising bridging materials and other embedded solid materials, said method comprising the steps of injecting a clean-up fluid and contacting it with the filtercake for a period of time sufficient to loose some of the other solids embedded in the filter cake; removing the loosened solids by a high-rate displacement fluid comprising suspending additives; and then injecting a dissolving fluid comprising a diverter and an effective amount of a salt or acid capable of dissolving the bridging material.

A data storage system and method for simultaneously providing thin provisioning and high availability. The system includes external storage volume and two storage subsystems coupled together and to external storage volume. Each of storage subsystems includes disk drives and a cache area, each of the storage subsystems includes at least one virtual volume and at least one capacity pool. The virtual volume is allocated from storage elements of the at least one capacity pool. The capacity pool includes the disk drives and at least a portion of external storage volume. The storage elements of the capacity pool are allocated to the virtual volume in response to a data access request. The system further includes a host computer coupled to the storage subsystems and configured to switch input/output path between the storage subsystems. Each of the storage subsystems is adapted to copy received write I/O request to other storage subsystems. Upon receipt of request from another storage subsystem, storage element of the capacity pool of storage subsystem is prevented from being allocated to the virtual volume of that storage subsystem.

A system and method for determining and communicating a traffic anomaly at a point to at least one receiving vehicle includes a traffic information center and at least one probe device. Each probe device is configured to determine and store within an on-board database a current value of a condition at the point during each of a plurality of trips, so as to build a history of condition values. The probe device is further configured to compare the current value to the historic values during each trip, and selectively transmit notification of an anomalous value to the center.

Data processing methods and systems are disclosed for use in industrial control. The methods and systems may include receiving control data from automation components of an industrial control system by a first computer system, the first computer system being coupled to the automation components by means of a first network, storing at least some of the control data in a first database by the first computer system, performing a database query of the first database for determination of a subset of the control data, aggregating the control data of the subset, and transmitting the aggregated control data to a second computer system over a second network.

The invention provides a PFC (power factor correction) control method with high input power factor and a control circuit thereof. The method comprises the steps of controlling a switching tube to be switched on and switched off according to the principle of leading impulse area to be equivalent, and leading input inductive current and sinusoidal half-wave current to have the equivalent impulse area in each switching period, thereby realizing the high power factor (PF); furthermore, the higher the switching frequency, the closer to 1 the PF value is. In the control circuit, a circuit topological structure of a Boost converter and a control circuit for realizing a variable duty ratio sequence jointly constitute a PFC stage of a commonly used LED (light-emitting diode) driving power supply, the front stage of the PFC stage is connected with the output end of a non-controllable rectifier bridge of a single-phase diode via an input filter capacitor, the back stage of the PFC stage is connected with a DC/DC (direct current/direct current) stage of the commonly used LED driving power supply via an output filter inductor and an output filter capacitor. By adopting the PFC control method, not only the very high input power factor can be realized, but also output voltage ripple can be reduced; furthermore, the control circuit is simple and easy to realize an analog circuit, thereby being conductive to large-scale integration.

A navigation method includes steps of calculating a first coordinate of a first position; taking the first coordinate to be a center of a predetermined range and calculating a first map data within the predetermined range according to a zoom scale of a map scale; downloading the first map data from a map server; storing the first map data; using the first map data to render a first graphic user interface map corresponding to the first coordinate; and displaying the first graphic user interface map.

The present invention discloses an energy-feedback type power quality disturbance generating device, which relates to a power quality disturbance generating device. The device comprises a harmonic source (1), a feedback link (2), a middle direct current capacitor (3), a control terminal (4), a first LCL filtering link (5), and a second LCL filtering link (6). The control terminal (4) adopts a DSP controller to realize that a control signal which is generated according to the setting of a user controls the harmonic source to partially generate current disturbance. The harmonic source and the feedback link are cascaded via the middle direct current capacitor to form an AC-DC-AC topological structure so as to realize power feedback. The alternating current side of the harmonic source is connected with a power network via the first LCL filtering link. The alternating current side of the feedback link is connected with the power network via the second LCL filtering link. The device is capable of simulating harmonic current, active current, inductance reactive current or capacitive reactive current of a plurality of combination frequencies, and the device is capable of simulating various working conditions of a plurality of nonlinear loads such as electric arc furnaces, medium frequency furnaces, welding machines and frequency converters, etc.

The battery charging apparatus has an auxiliary battery 1, a first charging circuit 20 for charging the auxiliary battery 1 with a first charging current derived from an externally connected commercial power source AC, and a second charging circuit 30 for charging the load battery LB with a second charging current that is higher than the first charging current and is derived from power from the auxiliary battery 1, which is charged by the first charging circuit 20. The first charging circuit 20 is connected to allow power supply to the auxiliary battery 1 and the second charging circuit 30. This makes charging circuit switching unnecessary and eliminates the need for components such as high-power switching devices. The charging apparatus has the positive features that stability and reliability are improved, and the load battery can be charged with the auxiliary battery 1 in a shorter time than using commercial power.

The invention provides a multi-unit device and a method for synchronically charging and discharging an accumulator. A main controller is respectively connected with a rectification (inversion) unit, a DC-DC converter unit, and an upper computer. The main circuit structure of the main controller comprises a front circuit part and a back circuit part. With the space vector pulse width modulation (SVPWM) technique used in the front circuit part of the inventive device, the power factor is approximately 1 in the charging mode and approximately -1 in the discharging mode, so as to improve the energy utilization efficiency, therefore, reducing the capacity requirement of an isolation transformer, and costs of other hardware. Meanwhile, the harmonic wave content is decreased and the pollution to a power grid is reduced. The device is in parallel connected with a plurality of independent two-way DC-DC converters, when a plurality of groups of battery units are synchronically charged or discharged, the residual electricity released by certain batteries can be charged into other batteries without passing through the power grid, so as to improve the service efficiency of the battery residual electricity and save electricity expenditure.

A sample nucleic acid sequence is compared against a database to find a matching sequence. In one embodiment, this comparison is accomplished with a table look-up approach that involves using sequences with collapsed homopolymer regions.

The invention relates to the technical field of computers, in particular to a mixed memory data backup system and method. The system is applied to the storage of data of a dynamic random access memory (DRAM) into a non-volatile memory. The system comprises: a user configuration module, used for selecting to-be-backed-up data from the data, carrying out priority determination on the to-be-backed-up data, determining a backup order of the to-be-backed-up data according to priority determination, generating state information of the to-be-backed-up data and sending the state information; a DRAM module, which is connected to the user configuration module, and dynamically and randomly accesses the data; a TABLE module, which is connected to the DRAM module and the user configuration module, and stores the state information of the to-be-backed-up data in the DRAM module; an NVM module, which is used to backup partial data and carry out nonvolatile storage on the partial data; and a controller, which is connected to the DRAM module, the NVM module and the TABLE module, and stores the data from the DRAM module to the NVM module according to the state information of the to-be-backed-up data in the DRAM module in the TABLE module.

The invention discloses a mobile charging method and device for an electric vehicle. The method comprises that a special-purpose charging lane is constructed beside a road, a high-frequency ac bus is laid under the lane, and multiple transmitting coils are connected with the ac bus in parallel to form an array; the tail end of the bus is connected with a shared adjustable resonant capacitor in series, and one or multiple transmitting coils and the shared adjustable resonant capacitor form an LC (Inductor-Capacitor) serial resonance circuit; and electric energy is transmitted via resonant coupling between the transmitting coils and a receiving coil of the electric vehicle, thereby charging a storage battery of the electric vehicle. The method and device of the invention can continuously and uninterruptedly charge the moving electric vehicle, thereby effectively lowering the requirement for the capacity of the battery, improving the endurance capability of the electric vehicle, reducing the pressure on the electrical work due to rapid charging, and being helpful for prompting large-scale applications of distributed power generation and electric vehicles.

The invention discloses a soft starting control method of a dual-active bridge DC converter applied to an intelligent power distribution network. According to the soft starting control method, a primary-side full bridge is unlocked, a secondary-side full bridge and closed-loop control of an external shift phase angle are shunted, the primary-side full bridge employs chopping control, a switch tubeQ3 and a switch tube Q4 are complementarily conducted at a duty ratio of 50%, the switch tube Q3 and the switch tube Q4 employs variable-duty ratio control, and the period of each switch is increasedat a certain step; when a secondary-side voltage is raised enough to drive the switch tubes and the duty ratios of a switch tube Q1 and a switch tube Q2 both are increased to 0.99, the secondary-sidefull bridge and the closed-loop control of the external shift phase angle are unlocked; and when an output voltage reaches a rated value, a load is switched, the output voltage is stable, and the starting process is completed. By the soft starting control method, the current overshoot of the dual-active bridge DC converter during the starting process is effectively prevented, the positive and negative symmetry of the current is ensured, the current-resistant requirement of the switch tubes is reduced, the cost is reduced, a magnetic biasing phenomenon of a transformer is prevented, and the capacity, the volume and the cost of the transformer are reduced.