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To reduce the risk of infection, improving the anti-infection ability of Ti-based implantation has become a very meaningful task. In this work, by employing polydopamine (PDA) as a carrier and curcumin (CUR) as an anti-biotic/inflammatory, a series of Ti-PDA@CURx (x = 0.5, 1.0, 1.5, 2.0, 2.5) was successfully fabricated and characterized by scanning electron microscopy, Fourier transform infrared spectrometry, X-ray diffraction, X-ray photoelectron spectroscopy, and the water contact angle, where Ti plates were firmly coated by PDA@CUR. The test result of CUR content shows that the maximum loading of CUR in PDA can reach 0.6506%, where the CUR concentration is 1.5 mg/mL. The antibacterial test results demonstrate that Ti-PDA@CUR-x (x = 0.5, 1.0, 1.5, 2.0, 2.5) exhibit significant antibacterial activities against Escherichia coli and S. aureu, where Ti-PDA@CUR1.5 has the highest antibacterial rate of 62.7% against Escherichia coli and 52.6% against S. aureus. The cytotoxicity test shows that Ti-PDA, Ti-PDA@CUR-x (x = 0.5, 1.0, 1.5, 2.0, 2.5) has almost no toxicity. [ABSTRACT FROM AUTHOR]

To meet the measurement needs of multidimensional high-g acceleration in fields such as weapon penetration, aerospace, and explosive shock, a biaxial piezoresistive accelerometer incorporating tension–compression is meticulously designed. This study begins by thoroughly examining the tension–compression measurement mechanism and designing the sensor's sensitive structure. A signal test circuit is developed to effectively mitigate cross-interference, taking into account the stress variation characteristics of the cantilever beam. Subsequently, the signal test circuit of anti-cross-interference is designed according to the stress variation characteristics of the cantilever beam. Next, the finite element method is applied to analyze the structure and obtain the performance indices of the range, vibration modes, and sensitivity of the sensor. Finally, the process flow and packaging scheme of the chip are analyzed. The results show that the sensor has a full range of 200,000 g, a sensitivity of 1.39 µV/g in the X direction and 1.42 µV/g in the Y direction, and natural frequencies of 509.8 kHz and 510.2 kHz in the X and Y directions, respectively. [ABSTRACT FROM AUTHOR]

Aiming at the problems of low efficiency of the traditional method for detecting smooth plug gauges and poor repeat accuracy of measurement parameters, a measuring system for the diameter of a smooth plug gauge based on machine vision technology is designed. This system drives the work-piece to move by two-dimensional work platform and collects image data through CCD, and the diameter parameters of the smooth plug gauge are obtained by processing the image which uses the threshold neighborhood location and segmentation method. In this paper, the mechanical structure and control structure of the measuring system are designed, the measurement principle and calibration method are explained, the relationship between the diaphragm and the threshold value under a fixed light intensity, and the relationship between the light intensity and the threshold value under a fixed diaphragm are studied. Finally, experiments have verified that the measuring system can complete the measurement efficiently, automatically, and with high precision within 20 s, and the repeatability of the measurement does not exceed 1 μm. [ABSTRACT FROM AUTHOR]