In this article, we survey various non-contact, non-destructive testing methods by way of terahertz (THz) spectroscopy and imaging designed for use in various industrial sectors. A brief overview of the working principles of THz spectroscopy and imaging is provided, followed by a survey of selected applications from three industries—the building and construction industry, the energy and power industry, and the manufacturing industry. Material characterization, thickness measurement, and defect/corrosion assessment are demonstrated through the examples presented. The article concludes with a discussion of novel spectroscopy and imaging devices and techniques that are expected to accelerate industry adoption of THz systems.
The war in Ukraine has triggered varying responses from people with Chinese heritage worldwide. These responses to the war highlight the diversities within global Chinese communities. They also serve as a lens through which we can observe how different Chinese communities intersect and interact through the internet and social media in a globalised world. This paper creates a few snapshots of juxtaposing opinions on the war in Ukraine among global Chinese communities. It identifies three preliminary patterns underlying these diverse opinions, pointing to directions for subsequent empirical studies. It also discusses how opinions toward the war in Ukraine expose the complex and complicated diversities and connections among global Chinese communities, calling for more scholarly efforts to situate Chinese studies within the global context.
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