摘要:
A detection apparatus and method for an ion migration spectrum include acquiring an ion migration spectrum of pure carrier gas and an ion migration spectrum of carrier gas containing a test substance sample and performing differential process on the ion migration spectrum of the pure carrier gas and the ion migration spectrum of the carrier gas containing the test substance sample to acquire a differential spectrum. The value of a characteristic peak of the differential spectrum represents properties of the sample of substances. The method avoids interferences on the migration spectrum from interference sources of the apparatus itself, thereby improving detection sensitivity and accuracy of the ion migration spectrum, and migration spectrum shift caused by variations in the environmental conditions can be found and corrected through the differential process on the migration spectrum of the pure carrier gas, thereby achieving self-stableness and self-correction of the ion migration spectrometer.
摘要:
A method and system for detecting special nuclear materials are disclosed. Said method and system detect the special nuclear materials by making use of the photofission characteristic and thermal neutron induced fission characteristic thereof. In one preferred embodiment, the high density and/or high atomic number region in the object to be detected is also detected first as a suspicious region.
摘要:
The invention discloses a data storage system and managing method thereof. The data storage system according to the invention includes N storage devices, a backup memory and a controller where N is a natural number. Each storage device has a respective write cache. Once the data storage system suffers from power failure, the backup memory still reserves data stored therein. The controller receives data transmitted from an application I/O request unit, executes a predetermined operation for the received data to generate data to be written, transmits the data to be written to the write caches of the storage devices, duplicates the data to be written into the backup memory, and labels the duplicated data in the backup memory as being valid in response to a writing confirm message sent from the storage devices.
摘要:
A mounting apparatus includes a chassis and a mounting piece. The chassis includes a rear plate. An expansion slot is defined in the rear plate, and a clipping portion extends from an edge of the expansion slot. The mounting piece includes a main body, an engaging piece extending from a first end of the main body, and an inserting portion extending from a second opposite end of the main body. The engaging piece defines a clipping slot, and two blocking portions are located on the opposite side of entrance of the clipping slot. The clipping portion is engaged in the clipping slot, and the two blocking portions prevent the clipping portion from being disengaged from the clipping slot.
摘要:
Disclosed is detection system for detection an object being conveyed along a convey path, the detection system comprises a DR imaging apparatus and a CT imaging apparatus which is provided at the downstream or upstream of the DR imaging apparatus along the convey path, wherein an average speed at which the object passes the DR imaging apparatus is higher than an average speed at which the object passes the CT imaging apparatus. The present invention also relates to a DR imaging apparatus for forming an image of an object by scanning the object, the object being conveyed along a convey path, the DR imaging apparatus comprising: an X-ray source; a detector for detecting passing of the object; a digital image processing unit; and a DR trigger module for data acquisition, wherein during the object passes the DR imaging apparatus, the DR trigger module triggers the DR imaging apparatus to perform data acquisition every time the object passes the DR imaging apparatus a predetermined distance A along the convey path.
摘要:
Disclosed is an ion mobility spectrometer. The ion mobility spectrometer comprises a sample injector (14), a semipermeable membrane (15), an ionization region (16), a terminal electrode (18), an ion storage region, a drift region and a Faraday plate (22), which are arranged along a drift tube in turn, wherein one or more air inlets (29) connected with a needle valve (30) and a first filtering device (31) are arranged in one side near the semipermeable membrane (15) of the ionization region (16), there is at least one opening in the terminal electrode (18), whose diameter is smaller than the diameter of the air inlets (29), an air outlet (28) connected with an air extracting pump (27) is arranged near the terminal electrode (18) in the ionization region (16), the drift region is separated from the ionization region (16) by a micropore structure of the ion storage region, another air outlet (25) connected with another air extracting pump (26) is arranged at one side near the Faraday plate (22) of the terminal electrode (18).
摘要:
The invention discloses a data storage system and managing method thereof. The data storage system according to the invention includes N storage devices, a backup memory and a controller where N is a natural number. Each storage device has a respective write cache. Once the data storage system suffers from power failure, the backup memory still reserves data stored therein. The controller receives data transmitted from an application I/O request unit, executes a predetermined operation for the received data to generate data to be written, transmits the data to be written to the write caches of the storage devices, duplicates the data to be written into the backup memory, and labels the duplicated data in the backup memory as being valid in response to a writing confirm message sent from the storage devices.
摘要:
An electronic device includes a computer, a backboard, a circuit board attached to the backboard, and a supporting base attached to the top surface of the circuit board. The computer case includes a bottom plate. The backboard is attached to the bottom plate. The backboard and the supporting base engage with the circuit board, and the backboard is located between the bottom plate and the circuit board, to prevent the circuit board from contacting the bottom plate.
摘要:
The present invention relates to a method of improving detection sensitivity of an ion mobility spectrometer, comprising: inserting a sample into a sample receiving device of the ion mobility spectrometer; triggering an operation of spectra acquisition through an optocoupler; when the number of the acquired spectra reaches the level required to contain enough information for accurate detection of explosives with relatively high vapor pressure, adding a dopant instantly to the ionization region by controlling the ON/OFF-state of an electromagnetic valve; when the number of the acquired spectra reaches the level required to contain enough information for accurate detection of explosives with relatively low vapor pressure, stopping the acquisition operation, and turning off the electromagnetic valve so as to stop adding the dopant to the ionization region; analyzing all of the acquired spectra to obtain the detection result. The addition time of the dopant is controlled such that the dopant can take effect on the detection of some explosives with relatively low vapor pressure while the explosives which can be detected with higher sensitivity when no dopant is added can be analyzed in the case that the dopant concentration is very low, thereby achieving the optimal detection performance of the apparatus by taking account of its response to various explosives.
摘要:
A hand-held sampling apparatus used for an ion mobility spectrometer and method of obtaining a sample are provided to prevent deformation of sampling wipes when detecting explosives and drugs. The apparatus has a body comprising a handle in the rear portion and a wiping sampling mechanism in the front portion, with a wiping surface located on its underside. The sampling wipe can be in full contact with the surface of the object during wiping to improve wiping efficiency. Correspondingly, a smaller sample inlet port can be disposed on the analyzer so as to save a large amount of sampling wipes. and meanwhile avoid sampling wipes from deformation and folds hard to restore, thereby ensuring subsequent sample insertion operation, enhancing the efficiency of both sample collection and sample injection and improving the detection performance for the analytes to be detected. The method of using said sampling device according to the present invention comprises the following steps: attaching a sampling wipe to the swiping surface; fixing the front end portion of the sampling wipe by using the front holder, and fixing the rear end portion of the sampling wipe by using the rear holder. The method of the present invention is simple and convenient.