Bis(ethyl­enedithio)tetra­thia­fulvalenium–tetra­chloridocobaltate(II) (3/2)

The structure of the electrochemically crystallized title compound, (C10H8S8)3[CoCl4]2, consists of two types of bis­(ethyl­enedithio)tetra­thia­fulvalene (BEDT-TTF) radical cation stacks separated by sheets of tetra­hedral [CoCl4]2− anions. One of the BEDT-TTF mol­ecules is generated by inversion. There are short S⋯S contacts between the stacks in the a direction and short C—H⋯Cl contacts between the radical cations and the anions

Study on dynamic strength and liquefaction mechanism of silt soil in Castor earthquake prone areas under different consolidation ratios

Under the Castor earthquake, there is a risk of liquefaction instability of saturated tailings, and the evolution of dynamic pore pressure can indirectly reflect its instability process. Before applying dynamic loads, the static stress state of soil is one of the main factors affecting the development of soil dynamic strength and dynamic pore pressure, and there are significant differences in soil dynamic strength under different consolidation ratios. This paper conducted dynamic triaxial tests on saturated tailings silt with different consolidation ratios, and analyzed the dynamic strength variation and liquefaction mechanism of the samples using the discrete element method (PFC3D). The results showed that 1) as the Kc′ gradually increased, and there was a critical consolidation ratio Kc′ during the development of the dynamic strength of the sample. The specific value of Kc′ was related to the properties and stress state of saturated sand. The Kc′ in this research was about 1.9. When Kc < 1.9, dynamic strength was increased with the increase in Kc; when Kc > 1.9, dynamic strength was decreased with the Kc. 2) Under the impact of cyclic load, when samples were normally consolidated (Kc =1), the pore water pressure would tend to be equal to the confining pressure to cause soil liquefaction. In the case of eccentric consolidation (Kc > 1), the pore water pressure would be less than the confining pressure, thus, the soil liquefaction would not be induced, and the pore pressure value would decrease with the increase of consolidation ratio. This paper provides engineering guidance value for the study of dynamic strength and liquefaction mechanism of tailings sand and silt in Castor earthquake prone areas under different consolidation ratios

Study on optical fiber multi-parameter sensor

Based on the principle of fiber Bragg grating detection,an optical fiber sensor for detecting wind speed and temperature and humidity in underground space was designed.The designed optical fiber wind speed sensor was based on the thermal flow detection method,which has high sensitivity to low wind speed.For the speed rising from 0 to 0.5 m/s,the wavelength variation is about 800 pm.For the demodulator with sensitivity of 1 pm,the speed resolution is 0.7 mm/s.Fiber optic humidity sensor was fabricated by uniform surface coating of FBG element in polyimide solution,and detection sensitivity of 4.2 pm/% RH was achieved with accuracy less than ± 3% RH

Simulation and analysis of radiant intensity for critical

Atmospheric oxygen A-band (759-767nm) airglow has strong radiation intensity in the visible band, and the global atmospheric temperature field can be obtained based on the oxygen A-spectrum line. In order to realize the marginal observation of oxygen A-airglow, the intensity distribution and change at different heights need to be simulated. Firstly, the body emissivity at different heights and solar zenith angles is obtained based on the photochemical model of oxygen A-band airglow. Secondly, the oxygen airglow radiation transmission process is established based on the observation geometry of the edge. Then, the airglow radiation intensity is simulated based on the detection geometry path of the edge to obtain the airglow spectrum lines at different observation heights of the edge