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[Purpose/Significance] Analyzing the process and development achievements of the research on Humanities and Social Sciences carried out by UNESCO in recent years will help to promote China's international participation and research level, and enhance China's discourse power in the field of Humanities and Social Sciences. [Method/Process]Using the methods of informetrics and scientific knowledge graph, this paper analyzes the topic structure, hotspot areas, evolution trend and international cooperation of UNESCO research in the field of Humanities and Social Sciences from 2011 to 2020. [Results/Conclusions]The research on Humanities and Social Sciences of UNESCO has obvious interdisciplinary characteristics. Ecological environment, educational research and political ecology are its hot research fields, and sustainable development is the core topic throughout. In the international cooperation of UNESCO, European countries occupy the leading position. China should rely on its advantages, pay attention to interdisciplinary research and hot field research, promote international cooperation, and enhance its influence and voice.

A compact five-element integrated ultrasonic transducer was designed and manufactured for the inspection of defects in the split pins of control rod guide tubes in nuclear power plants. The transducer consists of three types of ultrasonic elements to detect cracks in the entire volume of the split pins. In the transducer design, two main factors were investigated: the coupling of elements in confined space and measurement sensitivity. The experimental results demonstrated that the developed transducer has good acoustic performance and defect response capabilities and can detect 10 mm × 2 mm × 0.5 mm notches in the three areas of the split pins. This work provides a foundation for applications in nuclear site inspections.