Coal mine roadway deformation measurement system based on line scanning principle

When 3D laser scanning technology is used in measuring coal mine roadway deformation, there are problems of limited effective scanning distance, low density of acquired point cloud, serious lack of details, low measurement accuracy and low efficiency. In order to solve these problems, a coal mine roadway deformation measurement system based on line scanning principle is proposed. The system shoots a light strip image of a light plane projected by a line scanning laser on the roadway's surface through a measurement robot's measurement camera. The line structured light strip center extraction technology is used for light strip images to obtain the light strip center coordinates. The light strip center coordinates are substituted into the light plane equation fitted by the light plane calibration technology. The light strip image point cloud data of the roadway surface under the measurement camera coordinate system are solved. The rotary motor drives the line scanning laser and the measurement camera to rotate synchronously to obtain all the point cloud data of the roadway. The multiple groups of tracking cameras are used to capture the target image on the robot, so as to realize the continuous tracking and measurement of the robot's pose. Combined with the robot pose measurement results, all the point cloud data of the roadway are spliced to reconstruct the point cloud of the coal mine roadway. The point cloud slice is used to process the point cloud of the coal mine roadway to realize the rapid measurement of coal mine roadway deformation. The experimental results show that the measurement error of the system is less than 7 mm. The system has the characteristics of simple operation, high flexibility, fast measurement speed, wide measurement range and high measurement precision

The impacts of lithium and silicon coating on the W source in EAST

Application of lithium (Li) or silicon (Si) wall coating in the Experimental Advanced Superconducting Tokamak (EAST) has proven to be an effective method to reduce fuel recycling and control impurity level, and also to improve the plasma performance. In 2014, the upper graphite divertor in EAST was upgraded into a full tungsten (W) one with ITER-like actively water-cooled monoblock structure. Note that there is still large surface area of first wall covered by graphite tiles, including the lower divertor, NBI shine through armor, the outboard guard limiters, etc. In 2016 spring campaign, both Li and Si were used to coat the first wall in experimental sequences that lasted more than one month each. The spectroscopic observation reveals that compared to Si coating, Li coating more effectively suppresses in-vessel impurities, thus mitigating the W source in upper divertor. This is further quantified by a reduction of the effective W sputtering yield calculation. Carbon (C) impurity is suggested as the main impurity governing W sputtering, and correlates inverselywith the wall coating evolution during both one-day experiments and the whole campaign. The impurity concentration increases measurably after every vacuum vessel exposure to air during the campaign; substantial time is required for impurities to return to baseline levels. Real-time Li aerosol injection into the upper divertor effectively reduces the W sputtering by cooling the edge plasma and dissipating the power flux to divertor target, consequently providing an active tool for radiation divertor control. Keywords: Lithium and silicon coating, Tungsten erosion, Impurity concentration, Spectroscopic diagnosi

Enhancement of edge turbulence concomitant with ELM suppression during boron powder injection in EAST

Data supporting the manuscript "Enhancement of edge turbulence concomitant with ELM suppression during boron powder injection in EAST" published in Plasma of Physics, 2021.The dataset includes the data shown in the figures of the accepted paper [Z. Sun et al, 2021, Plasma of Physics]

Integrated ELM and divertor power flux control using RMPs with low input torque in EAST in support of the ITER research plan

Experiments have been carried out at the EAST tokamak to study ITER-relevant scenario integration issues, related to edge localized mode (ELM) control in H-mode plasmas by the application of three-dimensional (3D) resonant magnetic perturbations (RMPs), which have a large impact on the execution of the ITER research plan. The EAST experiments have successfully demonstrated ELM suppression at normalized torque inputs similar to ITER. The application of RMP fields with high toroidal mode number (n = 4) reduces the impact of ELM control on energy and particle confinement compared to those use lower n (n = 1, 2) RMPs. Injection of successive pellets is found to be effective in increasing the plasma density in ELM-suppressed H-modes and reducing the divertor power without triggering large ELMs at EAST. Access to high recycling and radiative divertor conditions while maintaining ELM suppression has been demonstrated in EAST by the use of gas fuelling and neon impurity seeding. Both approaches have been found to be effective in reducing power fluxes to the divertor strike points in near-separatrix lobes for both n = 2 and n = 4 RMPs. However, reduction of power fluxes in off-separatrix lobes is only effective for n = 4 RMP application, which is consistent with magnetic topology modelling (including plasma response) results showing a shallow penetration into the confined plasma region of field lines connected to these lobes compared to n = 2. The EAST results support the use of high n 3D fields for ELM suppression in ITER high QDT scenarios since they provide optimum integration features regarding energy and particle confinement, pellet fuelling, radiative divertor operation while eliminating ELM transient power loads and being compatible with low torque inpu

Randomized control study of the use of faropenem for treating patients with pulmonary tuberculosis

ABSTRACT: Objectives: Faropenem has antituberculosis activity in vitro but its utility in treating patients with tuberculosis (TB) is unclear. Methods: We conducted an open-label, randomized trial in China, involving newly diagnosed, drug-susceptible pulmonary TB. The control group was treated with the standard 6-month regimen. The experimental group replaced ethambutol with faropenem for 2 months. The primary outcome was the treatment success rate after 6 months of treatment. Noninferiority was confirmed if the lower limit of a 95% one-sided confidence interval (CI) of the difference was greater than −10%. Results: A total of 227 patients eligible for the study were enrolled in the trial group and the control group in a ratio of 1:1. Baseline characteristics of participants were similar in both groups. In the modified intention-to-treat population, 88.18% of patients in the faropenem group achieved treatment success, and 85.98% of those in the control group were successfully treated, with a difference of 2.2% (95% CI, −6.73-11.13). In the per-protocol population, treatment success was 96.04% in the faropenem group and 95.83% in the control group, with a difference of 2.1% (95% CI, −5.31-5.72). The faropenem group showed noninferiority to the control group in the 6-month treatment success rates. The faropenem group had significantly fewer adverse events (P <0.01). Conclusions: Our study proved that oral faropenem regimen can be used for the treatment of TB, with fewer adverse events. (Chinese Clinical Trial Registry, ChiCTR1800015959)