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In port dock engineering, high-piled wharves represent one of the primary structural forms. Damage to the foundation piles is a common issue, influenced by external loads such as impact forces during vessel berthing, slope deformations, and operational loads. This study focuses on the Jungong Road Wharf in Shanghai, utilizing FLAC 3D version 6.0 to conduct dynamic calculations under ship impact loading. The dynamic responses of the structure were analyzed, and various internal forces were extracted during the impact event. By combining concrete cracking failure criteria and fatigue damage theories, the effects of ship collisions on the cracking damage of high-piled wharf structures under different scenarios were assessed. Additionally, the applicability of modal flexibility in high-piled wharf scenarios was evaluated through finite element simulations. The results indicate that the dynamic amplification factor caused by dynamic loading is approximately 1.5, underscoring the necessity of considering this effect in the design and impact analysis of high-piled wharves. The impact loading significantly influences the bending moments of the piles, with inclined piles showing the greatest sensitivity. When a designed ship model collides with the high-piled wharf structure at a speed of 0.2 m/s, the tensile stress in the inclined piles reaches 87% of the ultimate tensile strength of the reinforcement. The impact loading has a relatively minor effect on the axial forces of the piles, a limited influence on the bending moments of the beams, but a considerable impact on the axial forces of the beams. Berthing by oversized vessels and unexpected incidents can lead to more severe damage to high-piled wharf structures. In the finite element simulations, modal flexibility effectively identified the locations of damage, with greater changes in modal flexibility correlating with increased damage severity. [ABSTRACT FROM AUTHOR]

A photonic instantaneous microwave frequency measurement scheme based on frequency-to-time mapping and channelization is proposed. An unknown signal is divided into four channels and mixed with a broadband linear frequency-modulated signal. The frequency information is converted to the time domain, and the frequency measurement range has been expanded due to channelization. A simulation system has been constructed to demonstrate the effectiveness of the proposed method. A proof-of-concept experimental result shows that the frequency measurement errors can be kept in 20 MHz with a 10 MHz resolution, and the frequency measurement range is 1 GHz to 39 GHz. [ABSTRACT FROM AUTHOR]

Co-innovation is a new paradigm and a new hot spot in the field of technological innovation. This study uses bibliometric analysis and CiteSpace to analyze the co-innovation related literature published at domestic and abroad during 2010-2022 to explore the current status and development trend of co-innovation research. The research results show that co-innovation research at domestic and abroad is developing rapidly and increasingly becoming a research hotspot in the field of technological innovation. Compared with foreign scholars who have begun to quantify and case study the technological paths of co-innovation, domestic research still mainly relies on qualitative methods to theoretically explore the institutional mechanism of co-innovation, which can hardly meet the development needs of co-innovation policy and practice. Therefore, this study proposes future research directions for co-innovation in four major aspects: mechanism of action, network model, empowerment mechanism and governance mechanism. As the first systematic study of co-innovation literature in China and abroad, this study has important theoretical significance and practical value.

Although literary awards have increasingly honored the diversity of America's foremost writers, few literary prizes are devoted to the celebration of immigrant writing. Fewer still are dedicated to providing a [...]

A poem "Improvisation" by Anni Liu is presented. First Line: When you knew me, I was a church accompanist; Last Line: I heard the music and knew what it is to be accompanied,

A poem "On The Anniversary Of Becoming A Resident Alien" by Anni Liu is presented. First Line: There are many ways to resolve; Last Line: Salt blue, salt blue, blue.