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To improve the microwave dielectric properties of SrBiNbO ceramics, the Ca element was selected as the substitute for Sr site. The CaSrBiNbO ceramics were prepared by the conventional solid-state ceramic route. The crystal structure, microstructural evolution and microwave dielectric properties of CaSrBiNbO (x = 0.0, 0.3, 0.6 and 1.0) were investigated. With the content of Ca ions increasing, the dielectric constant ε decreased from 145 to 98 and Q × f value increased from 167 to 672 GHz, respectively. Increasing sintering temperature can effectively promote the dielectric properties of CaSrBiNbO ceramics. The optimal microwave dielectric property of ε = 98, Q × f = 672 GHz was obtained for the CaBiNbO ceramic sintered at 1050 °C for 5 h. The relatively low sintering temperature and high dielectric properties in microwave range would make CaSrBiNbO ceramics promising for application in electronics. [ABSTRACT FROM AUTHOR]

This paper aims to improve the visual quality of endoscopic pictures by employing the Contrast Limited Adaptive Histogram Equalization (CLAHE) method and modifying the RGB channels using a gain matrix. In this paper endoscopic images are improved without requiring expensive equipment improvements. Clinicians can successfully recognize anomalies, lesions, and pathological features by enhancing picture clarity and contrast. This improvement may result in better patient outcomes and less dependence on expensive imaging equipment, which would ultimately be advantageous to patients and medical professionals. A range of endoscopic pictures taken in various settings will be used for extensive testing and confirmation. [ABSTRACT FROM AUTHOR]