Abstract: The present disclosure belongs to the technical field of biology, and in particular relates to an attenuated strain of African swine fever virus (ASFV) with IPTG-induced deletion of a D1133L gene and use thereof. In the present disclosure, it is firstly found that the D1133L protein of ASFV can inhibit production of IFN-? and downstream cytokines ISG-15 and ISG-56, and can be used as an immunosuppressant with a relatively strong immunosuppressive effect. In addition, the attenuated strain of ASFV with IPTG-induced deletion of the D1133L gene is constructed. Specifically, a screening expression cassette is inserted into a position before the non-structural protein gene D1133L of the ASFV using an Escherichia coli lac operator-repressor system, to obtain a recombinant virus. In the presence of the IPTG, the recombinant virus has similar characteristics to a wild-type virus; and in the absence of the IPTG, the expression of the D1133L protein is inhibited.

Abstract: A system for catalytic cracking of hydrocarbon oils has a catalytic cracking reactor, a catalyst separation device, an optional reaction product separator, and a regenerator. A catalytic cracking reactor has a dilute-phase transport fluidized bed and a fast fluidized bed connected in series for reaction. In the fast fluidized bed, the axial solid fraction ? of the catalyst is controlled within the range of about 0.1 to about 0.2. When used for catalytic cracking of hydrocarbon oil feedstocks, particularly heavy feedstock oils, the process and system show lower yields of dry gas and coke, and good product distribution.

Abstract: The present disclosure discloses a method for automatically identifying south troughs by improved Laplace and relates to the technical field of meteorology. The method includes the following steps: acquiring grid data of a geopotential height field; calculating a gradient field of the geopotential height field in an x direction; searching for a turning point where a gradient value turned from being negative to being positive, and cleaning the gradient field; calculating a divergence of the x direction to obtain an improved Laplacian numerical value L?; performing 0,1 binarization processing on the L? to obtain a black-and-white image and a plurality of targets of potential troughs, merging the black-and-white image and the plurality of targets of the potential troughs by expansion, recovering original scale through erosion, and selecting an effective target through an angle of direction of a contour and an axial ratio.

Abstract: A method and an apparatus for inspecting security of an object to be detected. The method includes: guiding an exciting light to the object, collecting a first optical signal from the object and generating .a first spectrum from the first optical signal; guiding the exciting light to the object again after a certain time interval, collecting a second optical signal from the object and generating a second spectrum from the second optical signal; and comparing the first spectrum with the second spectrum to determine whether or not the object is damaged.

Abstract: The present disclosure provides Raman spectrum detection apparatus and method. The Raman spectrum detection apparatus includes: a laser configured for emitting excited light; an optics assembly configured to guide the excited light along a first light path to a sample to be detected and to collect a light signal from the sample along a second light path; and a spectrometer configured to process the light signal collected by the optics assembly so as to generate a Raman spectrum of the detected sample. The optics assembly includes a first optical element configured to move, during irradiation of the excited light onto the sample, so as to change a position of a light spot of the excited light on the sample.

Abstract: The disclosure provides a Raman spectrum detection apparatus, including: a laser configured to emit laser light to an object to be detected; a Raman spectrometer configured to receive Raman light from the object; an imaging device configured to obtain an image of the object; and a controller configured to control an operation of the detection apparatus based on grayscales of the image. There is further provided a Raman spectrum detection method.

Abstract: A detection apparatus includes: a laser configured to emit laser light towards an object to be detected; a Raman spectrometer configured to receive a Raman light signal from the object; a light sensor configured to receive portions of the laser light reflected and scattered by the object under irradiation of the laser light, and to determine power of the received portions of the laser light; and a controller configured to control an operation of the detection apparatus based on the power determined by the light sensor. Further, there is provided a detection method using the above detection apparatus.

Abstract: The present disclosure relates to a non-contact type security inspection and method, the system including: a laser source for emitting probe light beams which penetrate through a container or a packaging and are irradiated onto an inspected object contained in the container or the packaging; an optical collection device for collecting an exciting light excited by the probe light beams on the inspected object; a spectrum analyzer for analyzing spectral characteristics of the exciting light collected by the optical collection device so as to determine characteristics of the inspected object; and a shielding apparatus for preventing at least part of the exciting light excited by the probe light beams on the container or the packaging from entering an induction area of the optical collection device.

Abstract: A Raman spectrum inspection apparatus and a sample security inspecting method for Raman spectrum inspection are provided. The Raman spectrum inspection apparatus includes: an exciting light source configured to emit an exciting light to a sample; an optical device having a spectrum inspection optical path and a sample imaging optical path, wherein the spectrum inspection optical path is configured to collect a light signal from a location where the sample is irradiated by the exciting light, and the sample imaging optical path is configured to take an image of the sample; a spectrometer configured to receive a light signal from the spectrum inspection optical path, and to generate a Raman spectrum of the sample from the light signal; and a sample security decision device configured to determine security of the sample based on the image of the sample that is taken by the sample imaging optical path.

Abstract: The present disclosure provides Raman spectrum detection apparatus and method. The Raman spectrum detection apparatus includes: a laser configured for emitting excited light; an optics assembly configured to guide the excited light along a first light path to a sample to be detected and to collect a light signal from the sample along a second light path; and a spectrometer configured to process the light signal collected by the optics assembly so as to generate a Raman spectrum of the detected sample. The optics assembly includes a first optical element configured to move, during irradiation of the excited light onto the sample, so as to change a position of a light spot of the excited light on the sample.

Abstract: A detection apparatus, including: a laser configured to emit laser light towards an object to be detected; a Raman spectrometer configured to receive Raman light from the object; an imaging device configured to obtain an image of the object; a light sensor configured to receive light reflected and scattered by the object under irradiation of the laser light, and to determine the power of the received light; and a controller configured to control an operation of the detection apparatus based on the image obtained by the imaging device and the power determined by the light sensor. A detection method using the detection apparatus.

Abstract: The present invention provides reconstituted tobacco and a preparation method thereof, and belongs to the technical field of tobacco. The preparation method provided by the present invention includes the steps of: subjecting tobacco stems to hot-water extraction and pulping by mill successively to obtain tobacco stem pulp; mixing the tobacco stem pulp with alkaline matter for oxygen delignification in an oxygen environment to obtain oxygen-delignified tobacco stem pulp, where the alkaline matter includes one or more of sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate and sodium bicarbonate; mixing the oxygen-delignified tobacco stem pulp with tobacco pulp, calcium carbonate and a retention agent, and subjecting the mixture to a papermaking process in the paper machine to obtain reconstituted tobacco sheets; and coating the reconstituted tobacco sheets with a concentrated tobacco extracting solution to obtain reconstituted tobacco.

Abstract: A Raman spectrum inspection apparatus is provided, including: a exciting light source configured to emit an exciting light to a sample to be inspected; an optical device configured to collect an optical signal from a position, which is irradiated by the exciting light, of the sample to be inspected; and a spectrometer configured to generate a Raman spectrum of the sample to be inspected from the received optical signal, wherein an excitation optical path in which the exciting light passes from the exciting light device to the sample to be inspected and a detection optical path in which the optical signal received by the spectrometer passes from the sample to be inspected to the spectrometer are separated from each other.

Abstract: An embodiment of the present disclosure provides a spectrum inspecting apparatus. The apparatus includes a laser source; a focusing cylindrical lens configured to converge a light beam onto a sample; a light beam collecting device configured to collect a light beam signal, which is excited by the light beam, from the sample, so as to form a strip-shaped light spot; a slit configured to receive the collected light beam and couple it to downstream of a light path; a collimating device; a dispersing device configured to disperse the collected light beam so as to form a plurality of sub-beams having different wavelengths; an imaging device configured to image the sub-beams on the photon detector array respectively, wherein the light beam emitted from the laser source has a rectangular cross-section, the strip-shaped light spot impinges on the slit and its length is smaller than a length of the slit.

Abstract: A Raman spectrum inspection apparatus and a security monitoring method for a Raman spectrum inspection apparatus are provided. The Raman spectrum inspection apparatus includes: a laser device configured to emit an exciting light; an optical device configured to guide the exciting light to an object to be detected and collect a light signal from the object; a spectrometer configured to split the collected light signal to generate a Raman spectrum of the object; and a security detector configured to detect an infrared light emitted from the object.

Abstract: There are provided a Raman spectrum inspection apparatus (100a) and a method of monitoring detection security of the same. The Raman spectrum inspection apparatus (100a) includes: an optical device (20) configured to guide exciting light (11) to a sample (30) and collect a light signal from the sample (30); a spectrometer (40) configured to split the light signal collected by the optical device (20) so as to generate a Raman spectrum of the sample (30) which is detected; and a security monitor configured to monitor a security state of the sample (30) during irradiating of the exciting light (11) from the laser (10) onto the sample (30), and to provide a security indicating signal representing whether or not the sample (30) is damaged due to being irradiated by the exciting light (11).

Abstract: A security inspection apparatus and a security inspection method are disclosed. In one aspect, an example apparatus includes a CT inspection device and a Raman spectrum inspection device, the CT inspection device includes: a CT scanner scanning an object to be inspected to generate a CT image, an image recognizing device recognizing the CT image to check whether or not the object has a suspected hazardous article, and an object marking device making a predetermined marker on the object which has the suspected hazardous article. The Raman spectrum inspection device includes: a Raman spectrum measuring device extracting a Raman spectrum of the suspected hazardous article in the object, a Raman spectrum comparing device comparing the Raman spectrum of the suspected hazardous article with Raman spectra of known compositions to determine a composition of the suspected hazardous article, and an object marker recognizing device recognizing the predetermined marker on the object.