1,234 research outputs found
Explore a probabilistic network model application for biopharma manufacturing process
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GW150914 and gravitational-wave astronomy
On September 14, 2015, the first detection of gravitational waves at the advanced Laser Interferometer Gravitational- Wave Observatory (LIGO) detectors, in the United States, marked the beginning of "gravitational-wave astronomy", that opens a new window looking into the violent sides of our Universe. It is very promising that at other wavelengths detections of gravitational waves with various space-based and ground-based observatories will show up in the near future of this century. These observatories include space-based laser interferometer antennas, pulsar timing arrays, cosmic microwave background satellites, etc
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Reference trajectory modification based on spatial iterative learning for contour control of 2-axis NC systems
Contour error is a main factor that affects the quality of products in numerical control (NC) machining. This paper presents a contour control strategy based on digital curves for high-precision control of computer numerical control (CNC) machines. A contour error estimation algorithm is presented for digital curves based on a geometrical method. The dynamic model of the motion control system is transformed from time domain to space domain because the contour error is dependent on space instead of time. Spatial iterative learning control (sILC) is developed to reduce the contour error, by modifying the reference trajectory in the form of G code. This allows system improvement without interference of low-level controllers so it is applicable to many commercial controllers where interpolators and feed-drive controllers cannot be altered. The effectiveness of this method is verified by experiments on a NC machine, which have shown good performance not only for smooth trajectories but also for large curvature trajectories
Identification of Free and Bound Exciton States and Their Phase-Dependent Trapping Behavior in Lead Halide Perovskites
In this work we probe the sub-gap energy states within polycrystalline and
single crystal lead halide perovskites to better understand their intrinsic
photophysics behaviors. Through combined temperature and intensity-dependent
optical measurements, we reveal the existence of both free and bound exciton
contributions within the sub-gap energy state manifold. The trapping and
recombination dynamics of these excitons is shown to be strongly dependent on
the structural phase of the perovskite. The orthorhombic phase exhibits
ultrafast exciton trapping and distinct trap emission, while the tetragonal
phase gives low monomolecular recombination velocity and capture cross-sections
(~10-18 cm2). Within the multiphonon transition scenario, this suppression in
charge trapping is caused by the increase in the charge capture activation
energy due to the reduction in electron-lattice interactions, which can be the
origin for the unexpected long carrier lifetime in these material systems.Comment: 5 figure
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