[en] This article gives and demonstrates six radiological protection criterions after a nuclear accident: leave criterion, delay criterion, control criterion, shield criterion, cut off criterion, clear off criterion. Compared with three radiological protection principles, six criterions are easy to catch for all the people, so they can help people better. (authors)

[en] Based on sliding mode variable structure control theory, the path tracking problem of automatic guided vehicle is studied, proposed a controller design method based on the terminal sliding mode. First of all, through analyzing the characteristics of the automatic guided vehicle movement, the kinematics model is presented. Then to improve the traditional expression of terminal sliding mode, design a nonlinear sliding mode which the convergence speed is faster than the former, verified by theoretical analysis, the design of sliding mode is steady and fast convergence in the limited time. Finally combining Lyapunov method to design the tracking control law of automatic guided vehicle, the controller can make the automatic guided vehicle track the desired trajectory in the global sense as well as in finite time. The simulation results verify the correctness and effectiveness of the control law. (paper)

[en] For identification the relationship between the sedimentary subfacies and the sandstone uranium deposit mineralization, the all drill hole data in the north belt of Shihongtan uranium deposit is arranged, the depositional sys- tem and sedimentary subfacies of ledge is established. Based on the depositional system and sedimentary subfacies controlled on the ground water direction, interlayer oxidization zone shape and uranium mineral ore shape are researched, that the interlayer oxidization zone shape and uranium mineral ore shape are completely controlled By the sedimentary subfacies the sedimentary subfacies is fount out and the significance of researching on the depositional system and the sedimentary subfacies in the Uranium deposit exploration is put out. In the conclusion the paper point out that survey project is arranged directed by the depositional system could acquire obvious result. (authors)

[en] The Late-reformation stages, types, distribution features in Ordos Basin are researched based on contact relation, sedimentary formation, tectonic deformation, main tectonic disturbance and isotopic age determination. Late-reformation of Ordos Basin occurs after Middle-Late Jurassic Epoch,and are divided into 5 phase, such as Late Jurassic, early Cretaceous, early Cretaceous end-paleocene epoch, Eocene epoch -miocene epoch, Miocene epoch-now. the main Late-reformation types are uplifting and weathering, thrust fold, fault depression ,deep burial with superimposition, and thermodynamic reforming. their space distributions are uniformity. Relationship between the Late-reformation and Sandstone-Type Uranium deposits are analyzed to think that Multi-uplifting and weathering after Middle-Late Jurassic Epoch controlle the formation of Sandstone-Type Uranium deposits, specially, uplifting tilting area confroled the space distribution of sandstone-type Uranium deposits, but thrust fold, fault depression, deep burial with superimositon is unfavorable to metallogenetic of sandstone-type Uramium, because the later change the form, depth of bearing-ore layers local groundwater discharge. (authors)

[en] By applying geological exploration,sulfur isotopes and inclusions measurement, researches targeting main Uranium production layer in Lower Cretaceous in the southwestern margin of the Ordos Basin has been done, it indicates that 3 alteration periods has occurred for the target layer, as the early period with brick red oxidation primary alteration; medium period as gray, white-gray and green-gray sandstone discoloration and alteration, the alteration minerals are mainly pyrite, chalcopyrite, bright crystal calcite and a small amount of chlorite; and late period alteration mainly contains brown-yellow and purple-red oxidation and alteration, and the alteration minerals are powdery limonite and pitchblende. The uranium gathering and mineralization is related with the gray, white-gray and green-gray sandstone discoloration and alteration, purple-red, brown-yellow spots or zones are usually discovered besides, and main Uranium minerals are sequences as asphalt Uranium ore, coffinite, and calcite-chalcopyrite. (authors)

[en] More than 10 kW power was generated by a W-band, third harmonic gyrotron. A cylindrical open cavity with an iris structure was used. The operation mode of the third harmonic gyrotron was TE₀₂. In the test, the pulse duration was 20 μs. The beam voltage and current were 45 kV and 3 A, respectively. When the magnetic field was 1.2 T, the frequency observed was 95.22 GHz. The output power was 13.4 kW, corresponding to the efficiency of 9.9%. (authors)

[en] A position sensitive neutron detector was used to measure the differential cross sections of 14.8 MeV neutrons scattered in the angular range of 2.5deg to 16deg from Fe, Ni and Cr. The daata were corrected for flux attentuation, multiple neutron scattering and finite geometry by Monte Carlo method. The angular distributions were calculated with coupled channels code ECIS79. The measured and calculated results were compared and discussed. (orig.)

[en] By theoretical analysis of potential and electric field distribution of a gyrotron electron beam, the formula of velocity ratio measurements is presented. The electron beam is equivalent to transmission-line inner conductor. A ceramic capacitance divider is proposed for velocity ratio measurements. The design and processing technique of the measurement system, the calibration method and result interpretation of the ceramic capacitance divider are presented. At last, the result of primary experiment is introduced. Capacitance divider was selected for the velocity ratio measurement because it does not perturb the electron beam and normal operation of the gyrotron is preserved as a result. This technology can be used to guide the design of magnetron injection gun and the gyrotron experiments. (authors)

[en] High-quality BiOCl with {001} facets were successfully synthesized via a facile solvothermal method by controlling the volume ratio of ethanol (ET) and ethylene glycol (EG). The diameters of BiOCl nanosheets with {001} facets varied from 600 to 50 nm with the increase of EG content while the thickness nearly remained the same (∼20 nm). In the meantime, the morphologies of BiOCl turned into 3D hierarchical microspheres from 2D nanosheets. The 91.84 % {001} facets-exposed BiOCl nanosheets with diameter of 300–600 nm exhibited the best photocatalytic activity for the degradation of rhodamine B (RhB) under visible-light irradiation on account of the strong adsorption property of the effective electron injection as well as the sequent reactive radical formation. More importantly, the RhB-sensitized BiOCl nanosheets showed effective photocatalytic property for breaking down methylene blue (MB) and methyl orange (MO) while RhB keeping almost intact until MB and MO had been photodegraded. It was found that the sensitizer radical cation (·RhB"+) could react with MB and MO and their suitable redox potential confirms that as well. These findings may provide a promising approach method for synthesizing other metal oxyhalide materials with controllable diameters of nanosheets and deepen our comprehending for the role of the semiconductor in the sensitization process.

[en] A cyclotron superradiance(SR) which combines the merits of cyclotron and SR has a potential advantage in developing superradiant HPM sources operating at millimeter and submillimeter wavebands. The working characteristics of the cyclotron SR was analyzed using 3D PIC simulation, based on which the working parameters were optimized. A square relation between the beam pulse width and the peak power was given, which proved that the system worked in the SR regime. Preliminary experiment shows that when the beam parameters were 210 kV, 250 A and the guiding magnetic field was 1.73 T, microwave pulses were acquired, with the peak power of 6 MW, the peak power conversion efficiency of 11.4%, the frequency of 37.2 GHz and TE₀₁ output mode. The results are in accordance with the simulation ones. (authors)