340 results about "Non detection" patented technology

An apparatus for detecting chemical substances which is high in sensitivity and selectivity is provided.

An organic acid or an organic acid salt is used to generate an organic acid gas from an organic acid gas generator 3 to be mixed with a sample gas for introduction into an ion source 4 for ionization, thereby obtaining a mass spectrum by a mass analysis region 5. A data processor 6 determines the detection or non-detection of a specific m/z of an organic acid adduct ion obtained by adding a molecule generated from the organic acid to a molecule with specific m/z generated from a target chemical substance to be detected based on the obtained mass spectrum. When there is an ion peak with the m/z of the organic acid adduct ion, the presence of the target chemical substance to be detected is determined, and an alarm is sounded. False detection can be prevented.

A system and method for detecting islanding in a Distributed Generation utility grid is described. In some examples, the system, via an inverter, injects a frequency disturbance to a location of the utility grid associated with a DG generator, measures both the frequency error due to the disturbance and the frequency drift of the location of the utility grid, and determines islanding based on a maximum value of the frequencies. In some cases, the system is able to reduce or minimize the Non-Detection Zone of the inverter by detecting islanding without always relying on a detectable frequency error due to an injected waveform.

A device detects a wake-up keyword from a received speech signal of a user by using a wake-up keyword model, and transmits a wake-up keyword detection/non-detection signal and the received speech signal of the user to a speech recognition server. The speech recognition server performs a recognition process on the speech signal of the user by setting a speech recognition model according to the detection or non-detection of the wake-up keyword.

There is provided a lane departure warning apparatus capable of preventing false warnings and absence of a warning regarding lane departure which is attributed to special road geometries such as junctions and tollgates. The lane departure warning apparatus for outputting a warning signal upon determining departure of a vehicle from a lane, performing the steps of: when one dividing line in a vehicle width direction of the vehicle is non-detected, estimating a position of the one dividing line based on a position of the other dividing line as a first estimation dividing line; estimating a position of the non-detected one dividing line based on a position of the one dividing line prior to non-detection as a second estimation dividing line; and comparing the first estimation dividing line with the second estimation dividing line to determine lane departure.

The invention relates to an island detection method of a photovoltaic grid-connected system. In views of the problems that independently-adopted passive detection mode is effective only when effective when mismatching degrees of source and load are large and a large non-detection zone (NDZ) can be accordingly provided; and when an active detection mode is independently-adopted, the system is disturbed, and therefore the disturbance results in instability of the system, and accordingly over-voltage / under-voltage is provided. An over-frequency / under-frequency detection method is combined with an improved impedance detection method to conduct island detection to the system, and therefore the NDZ is reduced to a minimum, quality of electric energy is improved and total harmonic distortion (THD) is reduced.

An access point establishing a wireless LAN is constructed to have a monitor system ‘b’ for monitoring an available channel for communication, in addition to a communication system ‘a’. In the event of detection of radar/radio signals, the access point changes a communication channel used for wireless communication from a current active channel to the monitored channel. Each terminal belonging to the wireless LAN recognizes and follows this channel change by detection of a beacon broadcasted by the access point. In the case of non-detection of radar/radio signals for one minute at the monitored channel, the wireless communication is reestablished immediately at the monitored channel recognized as a CAC (channel availability check)-finished channel. This series of processing is also applicable to inter-access point communication, for example, communication in a WDS (wireless distribution system) mode. This arrangement desirably prevents the potential interruption of wireless communication in a 5 GHz frequency band for a significant period, in the event of detection of radar/radio signals, for example, a weather radar.

The invention provides a method for detecting the signals randomly accessed to a signal channel. The method comprises the steps: A. after a base station acquires N time domain correlation values R(m) of the u root sequence, and all m values corresponding to the N time domain correlation values are used as detection points; B. among all detection points, the detection point m_max corresponding to the biggest time domain correlation value is found out, when the biggest time domain correlation value R(m_max) is bigger than the peak detection threshold, whether lead codes randomly accessed to the signal channel is detected by a circular shift search window corresponding to the m_max is judged, the m_max and the point m1 and/or point m2 of the present detection points are used as non-detection points, wherein m1=(N+m_max-du)mod N, and m2=(m_max+du)mod N; C. if detection points are still left, the biggest time domain correlation value of the remained detection points is bigger than the peak detection threshold, the step B is jumped to, N is more than and equal to Nzc.

A battery pack for an electric device is disclosed which includes: a group of battery cells interconnected in series; discharge control circuitry for converting DC voltage of the group into AC voltage; an AC-output terminal through which an output of the discharge control circuitry is supplied to the device; charge control circuitry for converting AC voltage of a commercial power source into DC voltage, to thereby charge the group; and a charging terminal through which electric power of the source is supplied into the group, wherein the AC-output terminal is connectable with a power-input connector of the device, and the charging terminal is connectable with a charging connector of the source, the pack further comprising a detector for detecting insertion of the power-input connector into the AC-output terminal, wherein the discharge control circuitry initiates a discharge control sequence for the group, if the insertion is detected, and does not initiate the discharge control sequence, in response to non-detection of the insertion.

A power window apparatus includes a movable member, a motor, a pulse generator that generates a pulse as the motor rotates, and a controller. The controller includes a reference position setting unit that sets a pulse reference value corresponding to a reference position, a position detecting unit that detects a level of the height of the movable member on the basis of pulses, a lock detecting unit that, on the basis of pulses, detects a locked or unlocked state of the motor, a pinch detecting unit that, in the case where the locked state of the motor is detected, determines, on the basis of whether the level of the height of the movable member is positioned in a non-detection area, whether the movable member has reached the upper-end lock position or a pinch has occurred, and a voltage detecting unit that detects a driving voltage applied to the motor.

An operational amplifier has an input biased at a predetermined reference voltage. A control unit opens both second switches and third switches corresponding to unit batteries being non-detection object, closes fourth switch. The control unit further closes both one of first switches and one of third switches corresponding to one unit battery being a detection object to charge corresponding one of first capacitors. Thereafter, the control unit opens the fourth switch. The control unit further closes one of the second switches corresponding to the one unit battery being the detection object, instead of the one of the first switches. Thus, the control unit detects a voltage of each of the unit batteries.

A device includes a proximity sensor configured to detect when an object is within a predetermined proximity range of the device, and input detection circuitry configured to detect when an input operation is performed on the device. The terminal device includes control circuitry configured to determine a proximity detection state of the device, wherein an object detection state corresponds to a proximity state in which the object is detected within the predetermined proximity range, and an object non-detection state corresponds to a proximity state in which the object is not detected within the predetermined proximity range; control a suspended state of the device, wherein the suspended state is a state of reduced processing and/or power consumption; and control the input detection circuitry such that, when the device is in the suspended state and in the object detection state, the input detection circuitry stops input operation detection processing.

The invention provides an island detection method based on phase-frequency positive feedback and relates to the technical field of grid-connected inverter control. The island detection method includes: acquiring voltage signals of inverter grid-connected points through an analog to digital (AD) converter, utilizing a phase-locking ring to perform phase locking, and obtaining power grid frequency f and a voltage phase theta; calculating a power grid frequency average value F through cumulative number N of the power grid frequency f; obtaining an offset angle d theta through calculation according to the power grid frequency average value F, compensating the phase, obtaining a compensated output phase, measuring frequency f' of an inverter grid-connected point according to the output phase, and judging whether an inverter is in an island operation state. Compared with a traditional algorithm, the island detection method cannot be influenced by current, power and load impedance, has no non-detection zone and no artificial disturbance of frequency, the phase and the like, and does not lead harmonic wave toward a power grid. The island detection method is simple, rapid, reliable and accurate and improves island detection speed.

The invention discloses a three-band integrated atmospheric aerosol particle scattering coefficient measuring instrument and a three-band integrated atmospheric aerosol particle scattering coefficient measuring method. The measuring instrument comprises an optical measurement chamber, a light-emitting-diode (LED)-based integrating sphere light source (7) is arranged at the top of the chamber, a plurality of diaphragms (19, 20, 21, 22, 23 and 24) are arranged in the chamber, and a reflector (9) is arranged at a non-detection end to prevent multiple times of scattered light from entering a detector (11); and a sample gas inlet port (17) and a gas outlet port (18) are formed in the chamber, and the sample gas is extracted through a sampling pump (13) and enters a scattering cavity (8) from the gas inlet port. When the integrating sphere light source (7) is lightened, the light emitted from the light source is irradiated on the sample gas, and the actual measured scattered light intensityis received through a single photon detector (11) and converted into the measured photon number; a frosted glass (28) with stable performance is used for generating scattered light to eliminate errors caused by light intensity fluctuation of a light source and magnification drift of a photoelectric multiplier tube; through the standard gas and the zero gas, the measured scattering coefficient is calibrated and the air Rayleigh scattering background is deducted; and the single photon detector converts the received scattered light signals into electrical signals, then the electrical signals areprocessed and controlled by a micro processing control circuit, the scattering coefficient is measured in real time, and the data are transmitted to a touch screen (16) and displayed. The measuring instrument has good instantaneity, high measurement precision and stable system, and is easy for maintenance.

In a method of automatically powering on and powering off a display device, the display device is switchable between a power on mode, where the display device is operable to show an image frame, and a power off mode, where the display device is unable to show an image frame. The method includes the steps of: (A) while the display device is in the power on mode, enabling the display device to detect whether there is an image signal input; and (B) in response to non-detection of the image signal input in step (A), enabling the display device to switch operation to the power off mode. The method dispenses with the need to provide a power switch button on the display device, and power consumption of the display device can be further lowered due to operation in the power off mode.

The embodiment of the invention provides a method and base station for determining non-detection of down link control information. The method comprises that: a receiving terminal sends data through a physical uplink shared channel (PUSCH), and the data is demodulated, so a demodulation result is obtained; and if the signal quality threshold value of the demodulation result is smaller than a preset lowest threshold value, the terminal is determined that the down link control information is not detected. The base station comprises a processing module and a determining module. The scheme provided by the embodiment of the invention can effectively detect the non-detection of DCI0 at UE side, so caused by non-detection are avoided, and the spectral efficiency of the base station is improved.

An X-ray detector including: a substrate that is divided into a light detection area and a non-detection area and includes a plurality of pixels; a photodiode disposed on the light detection area; a thin film transistor that is disposed on the non-detection area and is electrically connected to a lower portion of the photodiode; a plurality of wires that are electrically connected to the thin film transistor and are positioned on the non-detection area; at least one insulating layer disposed so as to cover at least the thin film transistor and the plurality of wires; a scintillator layer disposed on the at least one insulating layer over an entire surface of the substrate; and a shielding part disposed between the at least one insulating layer and the scintillator layer to shield the non-detection area.

Disclosed is a high sensitivity ultrasonic probe comprising a connecting head (1), a shell (2), a damping block (3), a cable line (4), a diode (5), an acoustic lens (6) and a cable line (7); the probe is characterized in that: the high sensitivity ultrasonic probe comprises two to twenty elements (8) that can transmit and receive supersonic waves; wherein: the connecting head (1) is fixedly connected with the shell (2), the damping block (3) is fixedly arranged inside the shell (2), the cable line (4) is connected with the diode (5) and disposed inside the shell (2), and the acoustic lens (6) is arranged under the elements (8) that can transmit and receive supersonic waves. The ultrasonic probe has the advantages of: high sensitivity in defect detection, high signal-noise ratio, strong resolving power to adjacent defects, small non-detection zone, being easy in accurate positioning to defects and accurate measurement of sizes of defects, and good directivity.

A semiconductor acceleration sensor, which prevents an adhesion of a movable electrode to a first or second fixed electrode due to an electrostatic attracting force generated therebetween. The sensor has a weight portion and movable electrodes formed on both sides of which, and first and second fixed electrodes each engaging with the each of the movable electrodes. Each of the first and second fixed electrodes is disposed in parallel with each of the movable electrodes so that side faces thereof determine a detection interval and non-detection interval larger than the detection interval with side faces of adjoining two of the movable electrodes. Protrusions are formed on both of the side faces of each of the first and second fixed electrodes. These protrusions prevent the movable electrodes from adhering to the first or second fixed electrode in both of the detection interval and non-detection interval.