News

PolyU researchers use novel satellite laser ranging technique to reveal accelerated global average sea-level rise

A research team led by Prof. CHEN Jianli, Core Member of Research Institute for Land and Space (RILS) and Chair Professor of Space Geodesy and Earth Sciences, has utilised advanced space geodetic technologies to deliver the first precise 30-year (1993–2022) record of global ocean mass change (also known as barystatic sea level), revealing its dominant role in driving global mean sea-level (GMSL) rise. Their research further indicates that GMSL has been increasing at an average rate of approximately 3.3 mm per year with a notable acceleration observed, highlighting the growing severity of climate change. The research findings have been published in the Proceedings of the National Academy of Sciences, with Dr NIE Yufeng, a Research Assistant Professor in Prof. CHEN’s team being the lead author. GMSL is primarily driven by two factors: the thermal expansion of seawater, as the oceans absorb around 90% of the excess heat in the Earth’s climate system; and the increase in global ocean mass, which is mainly caused by the influx of freshwater from melting land ice. Therefore, long-term monitoring of global ocean mass change is essential for understanding present-day GMSL rise. In the past, scientists have relied on long-term observations from satellite altimetry to monitor sea-level rise. Barystatic sea level records based on satellite gravimetry only became available with the launch of the Gravity Recovery and Climate Experiment in 2002. SLR is a traditional space geodetic technique used to accurately measure the distance between satellites and ground stations via laser ranging. However, fundamental constraints of SLR, such as the limited number of satellites and ground stations, the high altitude of the satellites (which means SLR-derived gravitational changes capture only the longest wavelengths) and the low-degree gravitational measurements, have restricted its direct application in estimating ocean mass change To effectively utilise SLR-derived gravitational fields for accurate estimates of ocean mass change, the research team implemented an innovative forward modelling technique that tackles spatial resolution limitations by incorporating detailed geographic information of ocean-land boundaries. This approach enables long-term monitoring of global ocean mass changes The research revealed that an increased rate of GMSL resulted in a global average sea-level rise of approximately 90 mm between 1993 and 2022, with about 60% of this rise attributable to ocean mass increase. Since around 2005, the rise in GMSL has been primarily driven by the rapid increase in global ocean mass. This overall increase is largely driven by the accelerated melting of land ice, particularly in Greenland. Throughout the entire study period, land ice melt from polar ice sheets and mountain glaciers accounted for over 80% of the total increase in global ocean mass. Press release: https://polyu.me/4g6ioDd   Online coverage: wn.com - https://polyu.me/45YB4jj Mirage News - https://polyu.me/46iGlni Oriental Daily News - http://polyu.me/4lV48hJ Ta Kung Pao - https://polyu.me/4n9KAXN Hong Kong Commercial Daily - https://polyu.me/47XmMC9 Line Today - https://polyu.me/3JZcVSo hkong.hk - https://polyu.me/4m5iLPO CCTV - http://polyu.me/4n9SYGQ Wuxi Daily - https://polyu.me/4n7EAPg Technology Networks - https://polyu.me/45Z6SVo Beijing-Hong Kong Academic Exchange Centre - https://polyu.me/4oYTadL Zhuhai Net - https://polyu.me/4mMXpYz Medium - https://polyu.me/4272D8X Guangzhou Daily - https://polyu.me/4p2SZ16 Nanfang Daily - https://polyu.me/4p5N3V2

Prof. DING Xiaoli pens article for Hong Kong Economic Times on development strategies for Northern Metropolis

Prof. DING Xiaoli, Director of Research Institute for Land and Space (RILS) and Chair Professor of Geomatics, and Dr GUO Jian, Project Fellow of RILS, penned an article in Hong Kong Economic Times on 1 September 2025, offering an in-depth discussion on the planned population density of the Northern Metropolis. The authors believe that the development of the Northern Metropolis will help release a substantial amount of land, for building a new, liveable and business-friendly area with a residential population of about 2.5 million in the northern New Territories adjacent to Shenzhen. This would break Hong Kong’s long-standing “south over north” spatial development pattern, promote the integration between northern Hong Kong and southern Shenzhen, and support the construction of an international innovation and technology hub in the Guangdong–Hong Kong–Macao Greater Bay Area. It would also serve China’s national strategy for technological self-reliance and strength, carrying profound significance for both regional and national development. In terms of population density, the two scholars consider that the Northern Metropolis has the potential for accommodating more people. Hong Kong has a land area of approximately 1,090 square kilometres (excluding inland water areas) and a population of about 7.52 million in 2024, making it one of the most densely populated regions in the world. The Northern Metropolis currently has a population of around 1 million, with a density of only 3,488 people per square kilometre. Even if its population increases to 2.5 million in the future, the density will only be 8,333 people per square kilometre, far lower than some of the other urban areas. Excluding country parks, the population density of the Northern Metropolis remains relatively low among Hong Kong’s eighteen districts. They pointed out that, the Northern Metropolis should be cherished as it is the last large tract of land in Hong Kong available for large-scale development, and its population density should be appropriately increased to improve land use efficiency and provide resources for future development. For example, if each square kilometre could accommodate an additional 2,000 people, this would accommodate a population of about 500,000, which is equivalent to that of the Kau Yi Chau Artificial Islands project, and could save approximately HK$580 billion in construction costs. Of course, in the long run, Hong Kong still requires land created through land reclamation to support sustainable development.   Online coverage: Hong Kong Economic Times - https://polyu.me/3I0tnRM (Chinese only)

PAIR Newsletter · Issue 15 · September 2025 is now available

We are excited to release the latest issue of the PAIR Newsletter! As Issue 15 is published, our brand-new initiative, the PAIR Advanced Education Programme, also commences.  Offered in dual mode and designed for learners from all backgrounds, our Programme addresses some of the biggest societal challenges facing the world today and the solutions to these problems.  Please stay tuned for news about our upcoming courses and join us on a scientific learning journey. This Issue presents a collection of compelling articles and important academy updates.  The Feature Stories section includes interviews of three leading scholars from distinct disciplines, who offer their perspectives on mental health research, photonics development and clean air actions.  Prof. QIU Anqi, Director of Mental Health Research Centre, explains how mental health diagnosis and intervention can be supported by engineering and data-driven approaches. PAIR Senior Fellow, Prof. YAO Jianping of the University of Ottawa, Canada, addresses the current development in and challenges facing the photonics industry. Prof. David PUI, also a PAIR Senior Fellow, describes how the giant air cleaning towers he and his collaborators designed help contribute to cleaner air in China and India. The Research Achievements section takes a closer look at several studies at PAIR which bring unique insights into sustainability, cultural heritage and human health.  The News & Events section summarises the latest knowledge-exchange activities, including international conferences, lectures and seminars conducted by PAIR and its constituent units. The Knowledge Transfer section highlights healthy ageing technologies developed by PAIR researchers that integrate medical engineering and artificial intelligence. The People section reports on the recent achievements by our scholars, including recognition as tech leaders and best scientists in their respective fields. Read on to discover the latest updates at PAIR! PAIR Newsletter · Issue 15: https://www.polyu.edu.hk/pair/publications/issue-15/

Prof. CAO Jiannong visits China Mobile IoT and appointed as Chief Visiting Expert

Prof. CAO Jiannong, Acting Vice President (Education), Otto Poon Charitable Foundation Professor in Data Science, Chair Professor of Distributed and Mobile Computing, and Director of Research Institute for Artificial Intelligence of Things (RIAIoT), paid a visit to China Mobile IoT Company Limited (CMIoT) on 24 August 2025. During the visit, both parties engaged in in-depth discussions on topics such as industrial application of large AI models, key technologies for passive IoT and mechanisms for joint university-enterprise research initiatives. They reached a consensus to embark on substantive cooperation in areas including national strategic research projects, cultivation of high-end talent, and the formulation of international technical standards, working together to promote the development of national strategic emerging industries and their expansion into global markets. Prof. Cao was also appointed as Chief Visiting Expert, with an appointment ceremony held on the same day. CMIoT highly commended Prof. Cao’s reputation in the fields of distributed systems, wireless sensing and networks, big data, and artificial intelligence, noting that his research directions are closely aligned with CMIoT’s strategic focus on large AI models and passive IoT. This exchange not only deepened mutual trust and understanding between the two parties, but also strengthened collaboration in innovative research and high-end talent development, laying a solid foundation for future joint laboratory establishment, collaborative research projects, and the transformation of scientific research achievements.   Online coverage: youth.cn - https://polyu.me/41pPN5y Toutiao - https://www.toutiao.com/article/7543071590293733942/?channel=&source=search_tab

Two PolyU education research projects awarded under Theme-based Exercise of Public Policy Research Funding Scheme

The Hong Kong Polytechnic University (PolyU) is committed to leveraging its outstanding research capacity to make a profound impact on the development of education in society. PolyU has secured support for two projects through the Theme-based Exercise specially launched under the Public Policy Research Funding Scheme (PPRFS) 2025/26 of the Chief Executive’s Policy Unit (CEPU). A total of eight projects received funding under the scheme focusing on education-related policies. Among all applicant institutions, PolyU ranked first in both the number of funded projects and the awarded amount. The two projects, led by scholars from the Department of Applied Social Sciences and the Mental Health Research Centre (MHRC), have collectively received approximately HK$1.6 million. They are recognised as being aligned with the future strategic positioning and development needs of Hong Kong. The two PolyU projects are (by project number): Principal Investigator Prof. YU Lu Associate Head and Associate Professor of the Department of Applied Social Sciences at PolyU Co-Investigators Prof GU Mingyue (Professor and Dean of Graduate School, EdUHK) Dr WU Ka-yu Florence (Section Head (Counselling and Wellness), Student Affairs Office, PolyU) Prof. HE Jingwei (Associate Professor, Division of Public Policy, HKUST) Prof. Ronnel Bornasal KING (Associate Professor, Department of Curriculum and Instruction, CUHK) Prof. LIN Li (Assistant Professor, Department of Psychology, LU) Prof. PAN Jiayan (Associate Professor, Department of Social Work, BU) Prof. YE Shengquan (Associate Professor, Department of Social and Behavioural Sciences, CUHK) Prof. ZENG Min (Assistant Professor, Faculty of Education, HKU) Project Title Enhancing Adaptation, Integration, and Career Development of Non-local University Students in Hong Kong Funded Amount HK$905,993.00 Duration 12 months   Principal Investigator Prof. CHEN Xiaohua Sylvia Associate Dean Faculty of Health and Social Sciences, Chair Professor of Social and Cultural Psychology of the Department of Applied Social Sciences at PolyU Co-investigators Prof. NG Chi Kit Jacky (Assistant Professor, APSS, PolyU) Dr AU Kit Yee Algae (Research Assistant Professor, APSS, PolyU) Dr LU Yiqing Erin (Senior Research Fellow, APSS, PolyU) Dr WU Ka-yu Florence (Section Head (Counselling and Wellness), Student Affairs Office, PolyU) Project Title Enhancing Cultural Integration for Non-local Students in Hong Kong: A Multicultural Acquisition Approach to Policy Development Funded Amount HK$694,257.55 Duration 12 months The PPRFS aims to encourage local think tank experts and scholars (including universities and civil society think tanks) to apply their expertise to conduct evidence-based research on key public policy issues, facilitate the knowledge transfer of research findings to policy considerations, and serve as a channel for the Government to tap into the public policy research expertise of society.

RiFood members featured on HOY TV’s programme on novel fungus-based fat replacer and new food regulations

Prof. Amber CHIOU Jiachi, Associate Director of the Research Institute for Future Food (RiFood), Associate Head and Associate Professor in the Department of Food Science and Nutrition, and Dr Gail CHANG Jinhui, Research Assistant Professor in the same department and Member of RiFood, were featured on HOY TV’s programme “InnoAction”, where they introduced AkkMore™, a novel fungus-based fat replacer developed by their research team.  Dr Chang explained, “Mushrooms have a very low fat content, typically only 0.5% to 3%. Our primary focus is on high-fat foods, and we are trialling the use of AkkMore™ in biscuits. This fat replacer can reduce the fat content in biscuits by half, and in cream cakes and similar products, it can reduce fat by 25%. It is user-friendly and suitable for any factory or home kitchen; simply add the powder during food preparation process.” Prof. Chiou added, “AkkMore™ can help reduce calorie intake. Furthermore, it can promote the growth of good bacteria in the gut. In our experiments on mice, we observed that obese mice exhibited anxiety symptoms showed alleviation of symptoms after consuming our formula. Their overall health also improved notably, with better control of blood sugar and lipid levels.” The two researchers noted that some fat substitutes currently available on the market may not be easily accepted by consumers due to factors such as their ingredients and taste. They will continue to research this mushroom-derived fat substitute, with the aim of bringing more innovative and healthy foods to consumers. Given that novel foods are expected to become a major trend in the future food market, Prof. Kevin KWOK, also Associate Director of RiFood, Associate Head and Associate Professor in the Department of Food Science and Nutrition, commented during the interview that whether new regulations are needed for such foods depends on their ingredient composition and production methods.   Online coverage: HOY TV - https://www.i-cable.com/%E6%96%B0%E8%81%9E%E8%B3%87%E8%A8%8A/380837/%E6%99%BA%E5%89%B5%E6%9C%AA%E4%BE%86-%E6%96%B0%E9%A3%9F%E6%9D%90-%E6%96%B0%E5%81%A5%E5%BA%B7 (14:58-17:13 and 20:48-22:55) (Chinese only)    

Dr LI Ming featured in Hong Kong Commercial Daily on real-world assets development

Dr LI Ming, Associate Researcher of Research Institute for Artificial Intelligence of Things (RIAIoT) and Executive Chairman of Hong Kong Web3.0 Standardisation Association, recently gave an exclusive interview to the Hong Kong Commercial Daily, in which he provided an in-depth analysis of the development trends and standardisation efforts in the Real-World Asset (RWA) sector. He pointed out that RWA tokenisation is developing rapidly, with legislation related to stablecoins also progressing at pace. RWA has now moved from the exploratory stage to practical application, with numerous projects urgently requiring standardised models and technical support to facilitate financing and ecosystem expansion. Dr Li emphasised that stablecoins and RWA are currently the two hottest topics in the industry, but they are fundamentally different: RWA leans towards project-level financial services and requires a comprehensive business model for support, whereas stablecoins are payment tools rather than investment assets. He reminded the public not to misunderstand the purpose of stablecoins, stressing that their core value lies in payment scenarios. The industry should strengthen public education to address misconceptions. Regarding the development of stablecoins, Dr Li proposed three main pathways: inter-institutional clearing and settlement; cross-border supply chains; and consumer-facing transfers and payments. He believes that stablecoin applications require an entirely new technological infrastructure, which traditional finance cannot achieve. Related business systems must find balance between regulatory compliance and innovation. In the future, large-scale technology integration service companies are expected to emerge, integrating resources from law firms and securities brokers to provide one-stop services including rights confirmation, valuation, issuance, and circulation. On the regulatory front, RWA presents new opportunities. Regulators are gradually establishing transparent regulatory principles and sandbox testing mechanisms, providing a compliant path for industry innovation. Most countries are adopting transparent regulation, establishing licensing regimes and regulatory sandboxes to offer a controlled testing environment for innovative applications. Hong Kong’s sandbox mechanism has become a key driver in promoting standards. Dr Li revealed that joint formulation of technical and business standards has already commenced, with over a dozen industry proposals under discussion. The standard documents are expected to be released next year, expecting to reach a consensus on industry self-regulation before further communication with the SAR government on related implementation. For enterprises interested in entering the RWA field, Dr Li recommends clarifying their business models and further streamlining the stablecoin industry chain. The emergence of integrated service providers will benefit the sector. The core value of Web3.0 lies in improving the efficiency of business model cycles, supporting financing and scale expansion. Building a clear, trustworthy, and transparent docking platform is crucial. Dr Li concluded by stating that stablecoin legislation, licensing, technological implementation, and business innovation all require long-term effort, and the healthy development of the industry depends on standardisation and rational understanding.   Online coverage: Hong Kong Commercial Daily - https://polyu.me/4fIzEy2 (Chinese only)

Prof. YANG Guang and Prof. LI Gang publish review article on perovskite/silicon tandem solar cells

A review article titled “Towards efficient, scalable and stable perovskite/silicon tandem solar cells” co-authored by Prof. YANG Guang, Assistant Professor in the Department of Electrical and Electronic Engineering, and Prof. LI Gang, Chair Professor in the same department, was recently published in the Nature Photonics. Perovskite/silicon tandem solar cells (TSCs) have emerged as a highly promising technology for photovoltaic energy harvesting, already surpassing the efficiency limits of traditional single-junction solar cells. Although recent power conversion efficiencies have approached 35%, perovskite/silicon TSCs still face a significant gap compared to their theoretical maximum. Additionally, challenges related to long-term operational stability and large-scale manufacturing must be overcome before this technology can be widely commercialised. This review provides a comprehensive overview of the latest advancements in perovskite/silicon TSCs, with a particular focus on three critical aspects: efficiency, stability, and scalability. The authors also offer a critical assessment of the remaining challenges and discuss the prospects for the future development of this technology. Prof. Yang is currently a Member of the Photonics Research Institute (PRI), Otto Poon Charitable Foundation Research Institute for Smart Energy (RISE) and Research Institute for Advanced Manufacturing (RIAM). Prof. Li serves as the Associate Director of RISE, Management Committee Member of PRI, and Member of Research Institute for Intelligence Wearable Systems (RI-IWEAR) and Research Institute for Sustainable Urban Development (RISUD). Read the full paper: https://www.nature.com/articles/s41566-025-01732-y

Prof. CAI Jing pioneer safer, AI-powered MRI imaging for nasopharyngeal carcinoma

PolyU researchers have made a breakthrough in MRI imaging for nasopharyngeal carcinoma (NPC). Traditionally, MRI scans for NPC rely on gadolinium-based contrast agents (GBCAs) to enhance tumour visibility. However, GBCAs pose health risks, including nephrogenic systemic fibrosis and potential accumulation of gadolinium in human brain. Led by Prof. CAI Jing, Management Committee Member of Research Institute for Intelligent Wearable Systems (RI-IWEAR), Research Institute for Smart Ageing (RISA), Professor and Head of Department of Health Technology and Informatics, and his team have developed an AI-powered, contrast-free MRI imaging, offering a safer diagnostic alternative. Their innovative Multimodality-Guided Synergistic Neural Network (MMgSN-Net) synthesises virtual contrast-enhanced images using information from T1- and T2-weighted scans, eliminating the use of GBCAs. Building on this, the team has introduced the Pixelwise Gradient Model with Generative Adversarial Network for Virtual Contrast Enhancement (PGMGVCE), which further improves image texture and detail. Comparative studies show that PGMGVCE matches MMgSN-Net in accuracy and excels in texture representation, which is crucial for precisely delineating the boundaries of NPC tumours. The findings highlight the importance of integrating multiple imaging modalities and advanced AI techniques to enhance diagnostic quality. These advancements promise safer MRI procedures for NPC patients, particularly those experiencing side-effects from contrast agents, and pave the way for improved cancer diagnosis and treatment planning. Future research will focus on expanding datasets and incorporating more MRI modalities to further boost diagnostic capabilities. Online coverage: Eurek Alert - https://polyu.me/45hPQ5R Bioengineer - https://polyu.me/413mNAp Technology Network - https://polyu.me/4mH2bWU Mirage News - https://polyu.me/3UsjhvF

Prof. WENG Qihao publishes comment article on urban visual-spatial intelligence

Prof. WENG Qihao, Associate Director of the Research Institute for Land and Space (RILS), Chair Professor of Geomatics and Artificial Intelligence and Global STEM Scholar in the Department of Land Surveying and Geo-Informatics, together with his research team has recently published an article titled “Urban visual-spatial intelligence: linking human and sensor perception for sustainable urban development” in npj Urban Sustainability.  The article points out that UVSI integrates human perception with advanced sensor technologies, moving beyond traditional smart city models that prioritise technology alone. By combining data from sources such as satellite imagery, IoT sensors, mobile devices, and social media, UVSI provides a real-time, multi-dimensional understanding of urban environments. A central feature of UVSI is its collaborative framework, ensuring continuous feedback between residents, technology, and urban spaces. This adaptive approach supports dynamic urban management and aligns with the United Nations Sustainable Development Goals, particularly SDG 11 for sustainable cities. UVSI informs policy-making, infrastructure planning, disaster monitoring, and climate action, while upholding privacy and public trust. Nonetheless, challenges persist, especially the integration of diverse types of data across geographical contexts and addressing associated biases. The research team believes that future research will focus on open-source models, digital twins, and ethical, AI-driven urban planning. As cities expand, UVSI’s holistic method promises more resilient, inclusive, and liveable urban environments by bridging technology and human experience, ensuring urban development remains responsive to the needs of all communities. Read the full paper: https://www.nature.com/articles/s42949-025-00256-2