Time series data file management method, device and equipment and storage medium thereof

The embodiment of the invention belongs to the technical field of data management, and relates to a time series data file management method and device, equipment and a storage medium thereof, and the method comprises the steps: obtaining table name information of a target storage table, and generating a management root directory for a file directory name; obtaining the cache storage time of each piece of cached to-be-managed time series data; based on the cache storage time and a preset table partition expression, performing partition processing on all the to-be-managed time series data; generating a management subdirectory under the management root directory; generating corresponding data management files under all management subdirectories according to the partition processing result and table structure information of the target storage table; and obtaining all the to-be-managed time series data, and writing the to-be-managed time series data into the corresponding data management file ...

Distortion offset bias circuit for improving amplifier linearity and method for improving linearity

The invention relates to a distortion offset bias circuit for improving amplifier linearity. The distortion offset bias circuit comprises a distortion current extraction circuit, a distortion current scaling circuit and a distortion current removing circuit. The distortion offset bias circuit is characterized in that the distortion current extraction circuit extracts distortion current generated by a reversal-biasing diode between a collecting electrode and a base electrode from a triode, the distortion current extracted are then sent into the distortion current scaling circuit for preliminary scaling processing, and the distortion current removing circuit sends the distortion current subjected to scaling back to the triode to be offset to complete distortion offset processing. The distortion offset bias circuit is ingenious in structural design, the entire distortion offset circuit is completed in the bias circuit of the triode, and signal processing of the triode is unaffected, so that ...

Amplifier, method for improving common mode feedback loop phase margin thereof and radio-frequency receiving chip

The invention discloses an amplifier and a method for improving common mode feedback loop phase margin thereof. The amplifier comprises an input stage circuit, an output stage circuit and a common mode feedback circuit; the input stage circuit and the output stage circuit comprise a plurality of transistors respectively; and the common mode feedback circuit comprises two transistors M19 and M20, the sources of the transistors M19 and M20 are grounded, and a resistor is connected between the grid and the drain of the transistor M19 or/and the transistor M20. According to the method for improving the common mode feedback loop phase margin of the amplifier, the resistor R introduced into the common mode feedback circuit improves the phase margin of a common mode feedback loop and improves the stability of the common mode feedback loop. From another perspective, the operational amplifier implemented by adopting the method can obtain better noise performance under the stable condition.

Grid-architecture-based plug-and-play type intelligent power grid experiment training system

Plug-and-play unit cabinet for intelligent power grid experiment training based on grid framework

The invention relates to a plug-and-play unit cabinet for intelligent power grid experiment training based on a grid framework, which comprises multiple unit cabinets, wherein each unit cabinet forms an m*n array; the m and the n are integers; each unit cabinet is provided with a primary system module, a secondary measurement and control module and a communication module; the primary system modules are provided with primary electric interfaces; the unit cabinets are connected with the adjacent unit cabinets and the secondary measurement and control modules through the primary electric interfaces; the secondary measurement and control modules finish measuring the current of each wire and the voltage of each bus in the primary system modules and controlling a breaker and convert the voltageand current of the primary system modules into the secondary voltage and the current which are consistent with an actual system and transmitted to a monitoring center; and the communication modules realize ...

Grid-architecture-based plug-and-play type intelligent power grid experiment training system

The invention relates to a grid-architecture-based plug-and-play type intelligent power grid experiment training system, which comprises a plurality of unit cabinets, wherein each unit cabinet forms m*n arrays (m and n are integers), and is provided with a primary system module, a secondary measurement and control module and a communication module; the primary system module is provided with a primary electric interface; the unit cabinet is connected with adjacent unit cabinets and the secondary measurement and control module through the primary electric interface; the secondary measurement and control module is used for measuring current and bus voltage of all circuits in the primary system module, controlling a circuit breaker, converting voltage and current of the primary system module into secondary voltage and current which are consistent with those of an actual system and transmitting the secondary voltage and current to a monitoring center; and the communication module communicates ...

Flotation clean coal classification re-flotation device and method

The invention relates to the technical field of coal slime separation, in particular to a flotation clean coal classification re-flotation device and method. The device comprises a classifying screen, a fine particle outlet is formed below the classifying screen, the fine particle outlet is communicated with a feeding port of secondary size mixing equipment, a discharging port of the secondary size mixing equipment is communicated with a feeding port of secondary flotation equipment, an overflow port of the secondary flotation equipment is connected with a feeding port of clean coal dewatering equipment, and the clean coal dewatering equipment is connected with a discharging port of the secondary flotation equipment. A discharge port of the clean coal dehydration equipment is connected with a clean coal product belt, an underflow port of the secondary flotation equipment is connected with a feed port of the concentration tank, an underflow port of the concentration tank is connected with ...

Crawler-type multi-stage coal-water separation integrated device

The invention relates to the field of mining equipment, in particular to a crawler-type multi-stage coal-water separation integrated device which comprises a supporting assembly, a coal-water separation assembly and a coal-water separation assembly. The gas-slag separation box assembly is used for adsorbing coal water at a drill bit of a drilling machine and can absorb a gas phase generated by the coal water; the primary filtering assembly is connected with the gas-slag separation box assembly and can receive a liquid phase obtained through separation of the gas-slag separation box assembly and separate large particles in the liquid phase; the secondary filtering assembly is connected with the primary filtering assembly and can receive the liquid phase filtered by the primary filtering assembly and separate smaller particles in the received liquid phase; and the power assembly is arranged on the supporting assembly and can provide power for the crawler belt, the gas-slag separation box ...

Blood sample culture device

The invention relates to a device for carrying out bacterial culture on a blood sample and particularly relates to a blood sample culture device. The blood sample culture device comprises a magnetic stirring device, wherein the a blood culture flask is fixed on the magnetic stirring device, a liquid medium is put in the blood culture flask, and a real-time detection and sampling device is fixed on the blood culture flask. The blood sample culture device is characterized in that the real-time detection and sampling device is provided with two channels, wherein the first channel is connected with a sampling pipe, a second channel is sequentially provided with a CO2 sensor and a pressure sensor, and the CO2 sensor and the pressure sensor are communicated with the inside of the blood culture flask through a hollow channel in the real-time detection and sampling device and are also linked with a computer. The blood sample culture device has the advantages of short detection cycle and high sensitivity ...

Phase-locked loop and automatic frequency calibration circuit thereof and phase-locked loop self-tuning locking method

The invention discloses a phase-locked loop and an automatic frequency calibration circuit thereof. The phase-locked loop comprises a phase/frequency detector, a charge pump, a filter, a voltage-controlled oscillator (VCO) and a first frequency divider which are connected in sequence, wherein the phase-locked loop further comprises the automatic frequency calibration circuit; the automatic frequency calibration circuit reduces the oscillation frequency CKV of the VCO when the oscillation frequency CKV of the VCO after undergoing frequency division by the first frequency divider is higher than the reference frequency CKR, and increases the oscillation frequency CKV of the VCO when the oscillation frequency CKV of the VCO is lower than the reference frequency CKR; and a precharging circuit A0 is connected at the input end of the filter and carries out precharging when AFC carries out searching. The phase-locked loop has the rapid self-tuning locking function and ensures the VCO to carry out ...

Prostrate nursing bed

A prostrate nursing bed comprises a bed body (1). The bed body (1) is provided with a head hole site (2) and two arm hole sites (3). An inflatable bed mattress (5) is arranged on the upper surface of the bed body (1), and pressure-sore-preventing air bags (5) are uniformly arranged on the inflatable bed mattress (5). The prostrate nursing bed has the advantages that the structure is simple, use is convenient and comfortable, the spiritual needs of patients are fully considered, books or electronic equipment can be arranged on a loading table when the patients lie prostrate, and then study or entertainment can be carried out; when needing rest, the patients can lie prostrate and go to sleep, and cover plates can be used for covering.

Phase frequency detector (PFD), phase frequency detection method thereof, phase locking loop (PLL) and frequency synthesizer

The invention discloses a phase frequency detector (PFD) and a phase frequency detection method thereof. When the phase of a feedback clock lags behind the phase of a reference clock, a pulse signal UP signal for improving the frequency is output by the PFD; when the phase of the feedback clock exceeds the phase of the reference clock, a pulse signal DOWN signal for reducing the frequency is output by the PFD; the PFD comprises two DFFs (D Flip-flops) capable of resetting; when the UP signal and the DOWN signal are both high, at least one of the two DFFs is subjected to time delay so as to ensure that the two DFFs are reset; and when a PLL (Phase Locking Loop) is locked, the PFD works in a linear area. When the PLL is locked, the PFD works in the linear area, thus the invention can be used for improving the in-band phase noise and strays.