Anomaly detection in hyperspectral image is affected by redundant bands and the limited utilization capacity of spectral-spatial information. In this article, we propose a novel Improved Isolation Forest (IIF) algorithm based on the assumption that anomaly pixels are more susceptible to isolation than the background pixels. The proposed IIF is a modified version of the Isolation
Recently, LI Dabing’s group from Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences (CAS) cooperating with DENG Huixiong from Institute of Semiconductors, CAS, have reported a method to realize high efficiency p-type in ultra-wide-gap III-nitrides by non-equilibrium quantum doping scheme. They found that the introduction of GaN quantum dots into the high Al content AlGaN materials can locally raise the band maximum (VBM) of the material, resulting in a great reduction of the activation energy for the Mg acceptor. Thus the AlGaN samples with low resistance and high hole concentration are obtained and are used to preparing high-performance deep UV LED.
Fourier ptychographic microscopy (FPM) is a recently developed computational imaging technique, which has high-resolution and wide field-of-view (FOV). However, due to the lower light efficiency of the off-axis LEDs, one has to balance the exposure time of dark-field images to improve the signal-to-noise of dark-field images. In addition, effected by the spherical illumination wavefronts of LEDs, the wavevectors of full-FOV are different. Hence, the full-FOV has to be divided into sub-fields and reconstructed sequentially, and then stitch them to obtain a full-FOV high-resolution images.
Researchers of Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Sciences, have developed a new medical endoscope which they say allows surgeons to see 3D images of the areas they are operating on while seeing the cancer tissues they need to remove highlighted in fluorescence at the same time.
Digital polymerase chain reaction(dPCR) is an absolute quantitative PCR reaction which can disperse the sample into numerous independent reaction units, in order to realize absolute quantitative detection in the sense of single molecule.
Metamaterial perfect absorbers (MPAs) often consist of metal and dielectric elements with dynamic control features of only subwavelength thicknesses. MPAs can achieve unity absorptivity of corresponding electromagnetic waves, and the sizes are much smaller than the working wavelength bands. These special absorbers with fixed absorption performance show great potentials in many important scienti？c and technical applications such as thermal emitters, energy harvesting, infrared detection and imaging.
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