Abstract: This disclosure relates to slow- and controlled-release fertilizers (S-CRF), and more particularly to a microelement amino acid chelate-urea formaldehyde (UF) slow-release fertilizer and a method for preparing the same by reactive extrusion. The microelement amino acid chelate-UF slow-release fertilizer includes a biodegradable UF polymer and a microelement amino acid chelate. The macromolecular chains of the biodegradable UF polymer interpenetrate in the cross-linked network structure of the chelate, so as to form a polymer composite with a semi-interpenetrating network structure.

Abstract: The present disclosure belongs to the field of photoacoustic signal detection, and specifically relates to a quantum-enhanced all-optical photoacoustic signal detection device and method. The problem of low sensitivity of photoacoustic signals based on interference measurement is solved, and high-sensitivity detection of photoacoustic signals generated by living organisms including human bodies can be achieved. A degenerate optical parametric oscillator based on a first-type phase matching crystals is used for preparing a vacuum squeezed state light field, a coherent control technology is used for locking the squeezed angle to obtain the quadrature phase vacuum squeezed state, the prepared quadrature phase vacuum squeezed state light field is injected into the vacuum channel of a Michelson interferometer, and a balanced homodyne detection mode is used for achieving detection of the quantum-enhanced photoacoustic signals.

Abstract: The present disclosure provides a kinship verification method based on generalized multi-view graph embedding, including the following steps: extracting features for multiple views of facial images from a training set and generating sample pair; constructing an intrinsic graph and a penalty graph of each of the multiple views based on semantic information, and converting and correcting a graph embedding method; implementing generalized fusion for the multiple views, and solving generalized eigenvalue decomposition; and calculating a similarity between the facial images, and outputting a kinship discrimination result.

Abstract: An apparatus and a method for measuring a microwave electric field at continuous frequencies based on an alternating current (AC) Stark effect of Rydberg atoms. A cesium vapor cell is used as an atomic sample cell. A cesium atom is excited to a Rydberg state by using detection light and coupling light that are emitted by two laser light sources, an electromagnetically induced transparency spectrum is generated. Further, a strong electric field is used as a local field EL, to cause AC Stark frequency shift and splitting of a Rydberg energy level. ES of to-be-detected signal electric field is applied. In this case, the Rydberg atom serves as a frequency converter, to directly read a beat frequency signal ?f of the local field and the signal field. From the beat signal, the strength of Es of signal filed can be directly read out.

Abstract: A method for ecological filling with mixed coal gangue and fly ash includes the following steps: S1: construction of a double-impermeable base layer: leveling a pit or gully, laying a fly ash-based cementitious material, compacting and curing; spraying a layer of polymer waterproof coating on a surface of the fly ash-based cementitious material, and fully curing to obtain a double-impermeable protective structure; S2: three-dimensional layered filling: dumping coal gangue and fly ash in sequence on the double-impermeable protective structure formed in S1, where the coal gangue and the fly ash are three-dimensionally layered and well graded; the coal gangue is coal gangue after coal washing, which is used as an aggregate; the fly ash is used as a filler and cementitious material to achieve a compact filling structure; and S3: rolling: rolling by a roller after the three-dimensional layered filling.

Abstract: A magnesium-based fly ash porous sound-absorbing material with a surface hydrophobically modified, and a preparation method thereof are provided. In the preparation method, a basic magnesium sulfate cement is adopted as a cementing agent and a fly ash is adopted as a mineral admixture to prepare a slurry; foaming is conducted through a physical foaming process in a foaming machine to obtain a foam; and the foam is mixed with the slurry, and a resulting mixture is poured and cured, and then subjected to a surface hydrophobic modification through vapor deposition to obtain the sound-absorbing material. The sound-absorbing material has a density of 251 kg/m3 to 306 kg/m3, a noise reduction coefficient (NRC) of 0.65 to 0.7, a compressive strength of 1.8 MPa to 2.2 MPa, and a water contact angle of 129° to 151°.

Abstract: A frequency measurement method and a system thereof are provided. The method includes: generating to-be-detected emergent light under an action of the electro-optical crystal when a light source irradiates an electro-optical crystal disposed in the microwave electric field; detecting, by a single-photon detector, the to-be-detected emergent light to obtain a detection result of the single-photon detector; and determining a frequency of the microwave signal based on the detection result of the single-photon detector and a Fourier transform algorithm.

Abstract: A method for ecological filling with mixed coal gangue and fly ash includes the following steps: S1: construction of a double-impermeable base layer: leveling a pit or gully, laying a fly ash-based cementitious material, compacting and curing; spraying a layer of polymer waterproof coating on a surface of the fly ash-based cementitious material, and fully curing to obtain a double-impermeable protective structure; S2: three-dimensional layered filling: dumping coal gangue and fly ash in sequence on the double-impermeable protective structure formed in S1, where the coal gangue and the fly ash are three-dimensionally layered and well graded; the coal gangue is coal gangue after coal washing, which is used as an aggregate; the fly ash is used as a filler and cementitious material to achieve a compact filling structure; and S3: rolling: rolling by a roller after the three-dimensional layered filling.

Abstract: The present disclosure relates to a test paper counting technology, in particular to a portable test paper counting device and method based on a single photon detector. A portable test paper counting device based on a single photon detector is provided, which includes a box-shaped housing, two guide rail pairs, two hanger rods, a laser, a reflecting mirror, a single photon detector, a power supply, and a PC computer. A rectangular operating hole penetrating from left to right is formed in a lower edge of a right side wall of the box-shaped housing. A right part of a bottom wall of the box-shaped housing is provided with an assembly hole penetrating from up to down. A left side wall of the box-shaped housing is provided with a threading hole penetrating from left to right. Sliders of the two guide rail pairs both face downwards.

Abstract: The present disclosure relates to the field of ecological restoration of a coal gangue hill, and in particular, to a solid waste-based porous material, a method for preparing the solid waste-based porous material, and a method of ecological restoration of the coal gangue hill by applying the solid waste-based porous material. A coal-based solid waste restoration material and mycorrhizal solid bacterial agent are mixed to restore the coal gangue hill, the coal-based solid waste restoration material is prepared by mixing coal-based solid waste porous materials, low-rank coal, and waste organic matter and adding a microbial quickly decomposition agent for aerobic fermentation and standing.

Abstract: A Ni—Al2O3@Al2O3—SiO2 catalyst with coated structure is provided. The catalyst has a specific surface area of 98 m2/g to 245 m2/g, and a pore volume of 0.25 cm3/g to 1.1 cm3/g. A mass ratio of an Al2O3 carrier to active component Ni in the catalyst is Al2O3:Ni=100:4˜26, a mass ratio of the Al2O3 carrier to an Al2O3—SiO2 coating layer is Al2O3:Al2O3—SiO2=100:0.1˜3, and a molar ratio of Al to Si in the Al2O3—SiO2 coating layer is 0.01 to 1. Ni particles are distributed on a surface of the Al2O3 carrier in an amorphous or highly dispersed state and have a grain size less than or equal to 8 nm, and the coating layer is filled among the Ni particles.

Abstract: The present disclosure relates to the field of ecological restoration of a coal gangue hill, and in particular, to a solid waste-based porous material, a method for preparing the solid waste-based porous material, and a method of ecological restoration of the coal gangue hill by applying the solid waste-based porous material. A coal-based solid waste restoration material and mycorrhizal solid bacterial agent are mixed to restore the coal gangue hill, the coal-based solid waste restoration material is prepared by mixing coal-based solid waste porous materials, low-rank coal, and waste organic matter and adding a microbial quickly decomposition agent for aerobic fermentation and standing.

Abstract: A device and a method for measuring thermal load caused by excited state absorption in laser gain crystal are disclosed. Thermal focal lengths on the tangential and sagittal planes of the laser gain crystal are obtained by obtaining the threshold when the pump power is decreased, the optimal operating point, and cavity parameters of the single-frequency laser. Individual ABCD matrices of the laser gain crystal on the tangential plane and the sagittal plane are obtained based on thermal focal length.

Abstract: A frequency measurement method and a system thereof are provided. The method includes: generating to-be-detected emergent light under an action of the electro-optical crystal when a light source irradiates an electro-optical crystal disposed in the microwave electric field; detecting, by a single-photon detector, the to-be-detected emergent light to obtain a detection result of the single-photon detector; and determining a frequency of the microwave signal based on the detection result of the single-photon detector and a Fourier transform algorithm.

Abstract: The disclosure relates to a quartz-enhanced photoacoustic spectroscopy gas detection apparatus and method based on beat effect. Provided is a quartz-enhanced photoacoustic spectroscopy gas detection apparatus based on beat effect, comprising a photoacoustic signal detection module, a gas chamber, a light source module and a data acquisition module. In the present invention, by detecting the beat signal generated by mixing the piezoelectric signal output from the quartz tuning fork with the demodulation signal of the lock-in amplifier, the electrical parameters of the quartz crystal oscillator and the concentration of the gas to be measured can be obtained accurately in a time period on the order of milliseconds.

Abstract: A pulsed light high-speed polarization locking method of a continuous variable quantum key distribution system is disclosed. An integral type optical detector is used for converting energy of a single pulsed light into a peak voltage of an output electric pulse in real time so as to achieve real-time measurement of light pulse energy without conducting high-speed data sampling and simplify the data acquisition and processing. By utilizing the FPGA hardware, a conditional simulated annealing algorithm is quickly operated to search the target polarization state and achieve high-speed polarization locking under the pulsed light. In addition, the power change of a local oscillator is monitored in real time to strengthen the resistance of the system against local oscillator dithering attack. The present invention can effectively solve a problem of rapid fluctuations of polarization state of pulsed light caused by complex external environments.

Abstract: A device and a method for measuring a thermal load caused by energy transfer upconversion in a laser gain crystal. Increasing the pump power multiple times so that the power meter obtains multiple thresholds for a single-frequency laser; obtaining an average pump threshold of the output laser; obtaining cavity parameters of the single-frequency laser; obtaining thermal focal lengths on the tangential and sagittal planes of the laser gain crystal inside the single-frequency laser; obtaining individual ABCD matrices of the laser system on the tangential and the sagittal planes; obtaining a thermal load at the threshold based on the ABCD transfer matrix of the laser gain crystal on the tangential plane, the ABCD transfer matrix of the laser gain crystal on the sagittal plane, and the average pump threshold of the laser system; obtaining a thermal load caused by ETU at threshold based on the thermal load at the threshold.

Abstract: A one-dimensional modulation continuous-variable quantum key distribution method is provided. The method includes transmitting, at a transmit end, a signal light field that passes through a first amplitude modulator and a first signal adjustment apparatus, and a reference light field, to an optical fiber combiner, and to a receive end through a quantum transmission channel. The method also includes separating, at the receive end, a quantum signal after the quantum signal passes through a second signal adjustment apparatus and an optical fiber splitter; and transmitting a separated reference light field and a separated signal light field to a measurement apparatus after the separated reference light field passes through a third signal adjustment apparatus and a phase modulator. Signal amplitude modulation and phase locking can be implemented by an amplitude modulator and a phase modulator, thereby simplifying the structure of the apparatus and reducing production costs.

Abstract: The present invention discloses a method for measuring a spatial rotation angle of an object, comprising steps of: controlling projection of probe light onto an object whose rotation angle is to be measured; controlling a balance homodyne detector, by which the probe light reflected or transmitted by the object whose rotation angle is to be measured is detected to obtain light parameters of the reflected or transmitted probe light; and calculating a rotation angle of the object whose rotation angle is to be measured, according to the light parameters detected by the balance homodyne detector. The device of the present invention is simple, easy to operate, and high in practicality. The measurement precision is high, and measurements of a rotation angle beyond the SNL (shot noise limit) can be realized. The present invention can be applied in high-tech fields such as precise manufacturing, spatial remote-sensing and bioimaging.

Abstract: The disclosure relates to a quartz-enhanced photoacoustic spectroscopy gas detection apparatus and method based on beat effect. Provided is a quartz-enhanced photoacoustic spectroscopy gas detection apparatus based on beat effect, comprising a photoacoustic signal detection module, a gas chamber, a light source module and a data acquisition module. In the present invention, by detecting the beat signal generated by mixing the piezoelectric signal output from the quartz tuning fork with the demodulation signal of the lock-in amplifier, the electrical parameters of the quartz crystal oscillator and the concentration of the gas to be measured can be obtained accurately in a time period on the order of milliseconds.