A Novel Joint Motion Compensation Algorithm for ISAR Imaging Based on Entropy Minimization.

Space targets move in orbit at a very high speed, so in order to obtain high-quality imaging, high-speed motion compensation (HSMC) and translational motion compensation (TMC) are required. HSMC and TMC are usually adjacent, and the residual error of HSMC will reduce the accuracy of TMC. At the same time, under the condition of low signal-to-noise ratio (SNR), the accuracy of HSMC and TMC will also decrease, which brings challenges to high-quality ISAR imaging.

Influence of Alkali Treatment on Properties of Bamboo Portland Cement Particle Board.

Bamboo contains water-soluble saccharides and carboxylic acid which have an anticoagulation effect on Portland cement; the anticoagulation ingredients can directly influence the adaptability of the Portland cement and bamboo shavings and finally influence the mechanical properties of bamboo Portland cement particle board. In order to improve the adaptability of bamboo and the Portland cement, bamboo shavings are pretreated with 1% NaOH solution, 2% NaOH solution, or 3% NaOH solution. High-performance liquid chromatography is adopted to analyze the influences of treatment based on different concentrations of NaOH solutions on the content of water-soluble saccharides and carboxylic acid in the bamboo shavings, and a Fourier infrared spectrometer and an X-ray diffractometer are utilized to analyze the characteristic peak changes and crystallization property changes, respectively, of the chemical ingredients of the bamboo shavings before and after the three types of pretreatment.

Research on the Compatibility of Bamboo and Portland Cement.

This paper researches the compatibility of bamboo and Portland cement by measuring the hydration temperature of Portland cement. Meanwhile, bamboo shavings and Portland cement, which were utilized as main raw materials, were prepared into bamboo Portland cement particle boards through cold compression forming, so as to further verify the compatibility of bamboo and Portland cement and research the practicability of preparing bamboo Portland cement particle boards by using bamboo. Research studies show that bamboo contain water-soluble saccharides, such as polysaccharide, disaccharide, and glucose, and organic carboxylic acids, such as formic acid and acetic acid.