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Now showing items 1 - 4 of 4

  • Ship draught detection apparatus and its detection method

    The present invention discloses a ship draught detection apparatus and its detection method. The ship draught detection apparatus includes two servo motors, a guide rail, a sonar detection device, a traction device, a locating device, and a control device. Compared with the provision of a series of sonar detection devices in the prior art, the provision of one sonar detection device reduces the cost and there is no mutual interference between adjacent sonars. Meanwhile, because a lock gate width of a ship lock is greater than a width of the ship, in order to improve the detection precision, the locating device is configured to predict in advance an accurate position of the ship when passing the ship lock according to the position of the ship and the orientation of a ship bow, and the control device controls the rotation speed and the direction of the two servo motors, and makes the sonar detection device move along the guide rail through the ropes, so that the sonar detection device is located just below the ship when the ship passes the ship lock, thereby improving the detection precision.
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  • The effect of deformation on metastable pitting of 304 stainless steel in chloride contaminated concrete pore solution

    Xingguo Feng   Xiangyu Lu   Yu Zuo   Ning Zhuang   Da Chen  

    Highlights • The lifetime and peak current density of individual metastable pits increase with increasing strains of up to 10%. • Secondary metastable pitting always occurred in the severely deformed stainless steel sample in the chloride-contaminated pore solution. • The growth rates of individual metastable pits are only modestly influenced by the strain level and carrier density, whereas the repassivation rates decrease dramatically with the two factors. Abstract Metastable pitting of tensile-stressed 304 stainless steel in a simulated concrete pore solution was studied via potentiostatic polarization and Mott–Schottky plots. The results revealed that the carrier density of passive films increases significantly with increasing magnitude of the strain. In addition, the lifetime of metastable pitting increases with the strain and secondary metastable pitting always occurred in the severely deformed samples. The growth rates of individual metastable pits were only slightly influenced by the strain level and carrier density. However, the repassivation rates of pitting dramatically decreased with deformation and carrier density when the strain is below 10%.
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  • Investigation on flow distribution of supercritical natural gas in a printed circuit heat exchanger

    Jinghan Wang   Ning Zhuang   Chengyong Hu   Yabin Wang   Qian Zhang   Min Zeng   Qiuwang Wang   Ting Ma  

    Printed circuit heat exchanger is considered as an promising candidate for floating storage and regasification unit of liquefied natural gas due to its high compactness and efficiency. The flow maldistribution is an essential issue in practical applications of the printed circuit heat exchanger, which leads to the performance degradation. In this study, the flow distribution of supercritical natural gas in a printed circuit heat exchanger plate is three-dimensionally simulated, and the thermal-hydraulic performance of the channels is investigated. To save the computational cost, a simplified two-dimensional model is proposed. The comparisons of results between the two- and three-dimensional models show that the effects of backflows, vortex, interaction between properties and flow distribution are the reasons that result in the differences between the two models. The findings suggest that the simplified two-dimensional model is capable for engineering demands with the satisfaction of computational accuracy and efficiency. It helps to overcome numerical difficulties and save computational resources in engineering applications such as the PCHE design.
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  • Experimental study of cement strength grade and mixing ratio to cement-soil mechanical properties

    Da Chen   Yingdi Liao   Ning Zhuang   Chaohua Jiang  

    Cement-soil mixing method is commonly used in strengthening soft soil foundation; the choice of cement strength grade and mixing ratio influence cement-soil strength and cost of engineering sales. Based on the characteristics of China southeast coastal silt soil; mechanical properties of cement-soil was studied in the condition of different strength grade. In addition; a function was proposed to predict cement quantity for different strength grade in the same ground compressive strength requirement; it has important significance to optimal proportioning and control engineering cost.
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