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PolyU signs agreement with HKEIA to advance technology and talent development of Artificial Intelligence

The Faculty of Engineering (FENG) of The Hong Kong Polytechnic University (PolyU) signed a Statement of Intent today with the Hong Kong Electronic Industries Association (HKEIA) to collaborate in talent and application development of Artificial Intelligence (AI), and to establish an AI Laboratory on PolyU's campus for supporting relevant research in Hong Kong. Sponsored by HKEIA, a leading AI supercomputer platform will be built and operated by PolyU to support and bridge the gap between business and research in AI as well as to provide training to PolyU students and HKEIA members. New research facility with the world's fastest AI supercomputer platform To achieve both parties' research objectives, HKEIA will support the establishment of an AI Laboratory at the FENG and donate HK$3 million for purchasing equipment, including NVIDIA® DGX-2™, which is among the fastest AI supercomputer platforms in the world. It is also the first of its kind to be installed in Hong Kong and Macau. Ir Prof. Alex WAI, Vice President (Research Development) of PolyU, said, "PolyU strives to transfer impactful research into cutting-edge technologies and solutions for the benefit of industry and society. With the establishment of the AI Laboratory, we are confident to further contribute to the research development and application of AI in Hong Kong and the Greater Bay Area." At the AI Laboratory, PolyU researchers and students will work alongside members of HKEIA to conduct impactful research and help industry develop and deliver practical data-driven models and solutions.   Under the agreement, both parties will organise training in AI for HKEIA members, conduct research with industry stakeholders, encourage collaboration in AI between companies, and hold joint networking and briefing sessions during business missions. Addressing the signing ceremony, Dr NG Chi-ho, Chairman of HKEIA, said "With this collaboration between the industry and the academia, we hope to nurture more entrepreneurs, researchers and management professionals in the field of Artificial Intelligence for Hong Kong." One of the main priorities of the training programmes will be to equip industry professionals and engineers with AI-relevant skills. Joint webinars and seminars, workshops and other events will also be organised to explain AI-based technologies, products, services, and standards in the electronics industry and related sectors. The collaboration between PolyU and HKEIA will meet the fast-growing need for engineering talent and expertise in AI, a critical technology in Hong Kong's plans to promote re-industrialisation and the development of a smart city. [From PolyU Media Release] Related News Articles: 理大夥電子業商會 設人工智能實驗室 [星島日報 (Sing Tao Daily) / 經濟日報 (Hong Kong Economic Times)]

PolyU garners Four Awards at Silicon Valley International Invention Festival

The Hong Kong Polytechnic University (PolyU) garnered four prizes with two outstanding innovations at the Silicon Valley International Invention Festival (SVIIF) 2019. Its Smart Indoor Farming System won a Grand Award and a Gold Medal with the Congratulations of the Jury, while its Flexible Scoliotic Brace with Shape Memory Alloy Struts won a Gold Medal and a Special Merit Award, at SVIIF held in Santa Clara, California, the United States from 24 to 26 June. SVIIF attracted inventors from research institutions, academic bodies and business enterprises from about 30 countries/regions to showcase their inventions this year. It was also the first time that Hong Kong institutions participated in this global annual event. Well attended by multi-national companies, investors, entrepreneurs and financiers, SVIIF offers a platform for inventors, industries and businesses to explore opportunities for collaboration and commercialisation of innovations. The award-winning innovations of PolyU: (1) Smart Indoor Farming System Grand Award and Gold Medal with the Congratulations of the Jury Principal Investigator: Dr LOO Ka-hong, Department of Electronic and Information Engineering Applying Artificial Intelligence-based and data-driven technologies, the system can generate photosynthetic-active-radiation lighting, watering and nutrient supply programmes which are optimised for the growth of individual plant types. The system adopts advanced sensing technologies to collect real-time data for the plant growth and environmental data from growth chambers and farms using the system. By comparing the data collected with the growth profiles of different plant types, optimal sets of growth control parameters can be constructed and fed back to the user's system. The system will then automatically supply the optimal tailor-made essentials, such as light, water, temperature, nutrients, to enhance the growth performance of individual plants. Study shows that the growth cycle of Italian lettuce has been shortened by about 50% with the support of this system. Water consumption can also be substantially reduced to only 5% of that in conventional farming. The system can be set up in urban buildings to provide sustainable and stable sources of edible plants, such as salad greens, potatoes, beets, herbs, etc. (2) Flexible Scoliotic Brace with Shape Memory Alloy Struts Gold Medal and Special Merit Award Principal Investigator: Dr Joanne YIP Yiu-wan, Institute of Textiles and Clothing The innovative brace, designed for adolescents with scoliosis, is made of shape memory alloy, artificial hinges and soft light-weight materials. The design can apply strategic corrective forces to the spine and offer adequate support to the user. Users are more willing to wear this Scoliotic Brace for a longer period because of its enhanced level of comfort and mobility, thus making it more effective in treating spinal deformity. SVIIF is hosted by International Federation of Inventors' Association (IFIA), supported by the World Intellectual Property Organization (WIPO), Santa Clara City and the Santa Clara University, in collaboration with the US Patent and Trade Mark Office. For details, please visit the organiser's official website: https://www.sviif.com/.   [From PolyU Media Release] Related News Articles: 理大科研奪矽谷發明展4獎 [文匯報 (Wen Wei Po) / 星島日報 (Sing Tao Daily) / 香港商報 (Hong Kong Commercial Daily)]

Scholars honoured with national natural science award

Led by Prof. Cao Jian-nong and Dr Dan Wang of the Department of Computing, the research project titled “Theoretical Models and Techniques of Distributed Computing in Wireless Network” received a Second-Class Award in Natural Science in the Ministry of Education’s 2018 Higher Education Outstanding Scientific Research Output Awards (Science and Technology) in recognition of its significant contribution. [From excel@PolyU]

Outstanding PolyU Alumni Association (OPAA) Master Class 2019/2020 Mentorship Programme: Call for Mentees (Deadline: 7 October 2019)

The OPAA Master Class 2019/2209 Mentorship Programme is now open for student application. This Mentorship Programme is part of the annual signature event organized by the Outstanding PolyU Alumni Association with the aim to provide a platform for students to learn from outstanding PolyU alumni in respect of their invaluable expertise and experience. Please click here for more details, and submit your application on or before 7 October 2019. 傑出理大校友協會大師班2019/2020 師友計劃：學員招募 傑出理大校友協會大師班2019/2020 師友計劃現正接受學生報名。此計劃是協會其中一個重點活動，邀請多位來自不同界別的傑出校友與學生分享他們的豐富經驗。請按此瀏覽計劃詳情，報名表格須於2019年10月7日前遞交。

PolyU ranked eighth in field-weighted citation impact of AI research

According to a study on the citation impact of research papers in the area of artificial intelligence (AI), PolyU is ranked number eight, the highest ranking among Hong Kong universities by field-weighted citation impact among the global universities under this study. And the top three are Massachusetts Institute of Technology, Carnegie Mellon University and Nanyang Technological University, Singapore. In terms of field-weighted citation impact by region, Hong Kong was on the top three, with a citation impact score of 2.00 although it produced fewer than 2,500 publications on AI over the time frame. This study is held by Times Higher Education and supported by Elsevier’s Scopus database. AI is one of the emerging areas for the education and research development of PolyU which has established various research collaboration platforms and has been carrying out many projects in this advanced technology. For instance, PolyU - Alibaba Cloud on Artificial Intelligence Collaboration particularly in smart cities and smart healthcare, PolyU - Royal College of Art to set up AI powered Design Laboratory, PolyU's funded projects in Alibaba Innovative Research Program, AI-powered system in textile industry, etc. Institution Country Publications Field-Weighted Citation Impact Massachusetts Institute of Technology United States 1,011 3.57 Carnegie Mellon University United States 1,311 2.53 Nanyang Technological University Singapore 1,197 2.51 University of Granada Spain 587 2.46 University of Southern California United States 627 2.35 Technical University of Munich Germany 656 2.27 Institute of Automation, Chinese Academy of Sciences China 588 2.26 Hong Kong Polytechnic University Hong Kong 602 2.20 National University of Singapore Singapore 807 2.14 Chinese University of Hong Kong Hong Kong 530 2.09 Source: Elsevier/Scopus Source of article: Times Higher Education (THE), May 2017   [From PolyU ITDO]

PolyU develops a high-efficiency, high-quality ultra-precision polishing technology for different kinds of freeform surfaces

The Hong Kong Polytechnic University (PolyU) developed a novel curvature-adaptive multi-jet polishing (MJP) technology for different kinds of freeform surfaces, i.e. surfaces without symmetry axis, which are widely used in high end products such as compound lenses in 3D imaging, Head-up display (HUD) lenses used in automotive, optical components for augmented reality and virtual reality headsets, etc. Time efficiency and surface quality improvement are the main goals of the technology research. This technology can meet the stringent requirements for ultra-precision and high efficiency in polishing to reduce the surface roughness in high-value-added products, such as artificial joints, turbine blades of aeroplanes and other components with complex geometric shapes. PolyU’s technological breakthrough in high quality polishing will add great value to the high-end precision equipment manufacturing in the Greater Bay Area. The cutting-edge technology is developed based on the current Fluid Jet Polishing (FJP), an ultra-precision non-contact polishing technology that pumps the pre-mixed slurry, i.e. abrasive particles and water, through an adjustable nozzle directly towards a target surface at appropriate speed to polish the surface of the freeform products to the desired finish. PolyU’s research team customised multi-jet nozzles and developed a computerised system to automate the process and to control the fluid pressure and processing time of each jet according to the shape, variation of curvature and surface polishing requirements of a workpiece. The technology can thus be applied to most of the freeform products, including products with various complex curved designs and inner surface finishing of pipe-shaped products. Similar to FJP, MJP is also of high machining accuracy, suitable for polishing complex surfaces, and will not cause tool wear and temperature increase of the workpiece during polishing. MJP, however, has additional advantages in ultra-precision polishing. It can overcome the limitations of FJP to improve the material removal rate, and the polishing efficiency particularly for large-scale surfaces, lens array surfaces and inner surfaces polishing. The higher efficiency of MJP compared with that of FJP tool has been validated through an experiment. In the experiment, the FJP polishing procedure on a 4x4 lens units array took about 320 minutes as the lens in the array was polished one after another and each unit requires 20 minutes. However, if a MJP tool is used, it only takes 20 minutes to polish all the lens because they were polished simultaneously. In this case, the processing time for using the MJP tool has been significantly improved by about 16 times as compared to FJP. Leading this innovative project, Ir Professor Benny CHEUNG, Head of State Key Laboratory of Ultra-precision Machining Technology, PolyU, said, “Surface finishing especially for freeform surfaces can be expensive, time consuming, labor intensive, and error prone. FJP has its limitation in efficiency, so it has only been used in small size surfaces. MJP can be applicable to various industrial fields, such as high-precision optical components and moulds, aerospace components, automotive systems, semi-conductor plants, as well as biomedical engineering industries. The beauty of MJP solution includes high efficiency and lower cost without compromising on the polishing quality. We believe the technology could bring substantial benefits to the advanced manufacturing industries.” In terms of cost-saving, it will usually cost several millions (HK$) to purchase a FJP machine. However, the design and production cost of a MJP machine innovated by PolyU will only be at about two-third of the cost for the commercialized FJP machine. Moreover, the MJP system can be adapted and integrated into the existing polishing machines or robotic arms, which will further cut down the set-up cost. The novel technology has recently won a Silver Medal as well as two Special Merit Awards at the 47th International Exhibition of Inventions of Geneva, 2019. The research team plans to further enhance the technology by developing apparatus fit for plugging in 3-dimensional (3D) printers for enhancing the efficiency of post-process finishing of 3D-printed complex components. Note: Video on “Ultra-precision polishing technology” [From PolyU Media Release]

PolyU develops Palm-sized 3D Ultrasound Imaging System for Scoliosis Mass Screening and Frequent Monitoring

The Hong Kong Polytechnic University (PolyU) today shared that more youngsters can have their scoliosis conditions detected early and monitored frequently, thanks to the portable imaging system developed by PolyU’s experts in scoliosis research. The first-of-its-kind palm-sized 3D ultrasound imaging system for radiation-free scoliosis assessment, named “Scolioscan Air”, can bring accurate, safe and cost-efficient mass screening to schools and anywhere in the community. The portable Scolioscan Air developed by the research team of PolyU’s Department of Biomedical Engineering (BME) was recently awarded Grand Award, Gold Medal with the Congratulations of Jury, and Special Merit Award at the 47th International Exhibition of Inventions of Geneva held in April. Scoliosis is one of the most prevalent spinal diseases affecting adolescents. It is estimated that about 3% to 5% of adolescents in Hong Kong suffering from scoliosis, with increasing prevalence in recent years.1 A recent study in Guangzhou indicated that for girls aged 14 and 15, the prevalence is as high as 13.8%. About 15% of the adolescents with scoliosis would have condition deteriorating, and bracing or surgery would be required when curves progress to moderate or severe status. Early detection of scoliosis conditions and regular check-up during the rapid growing period of adolescent school-children is thus crucial. At present, X-ray imaging is the clinical gold standard for scoliosis assessment, but radiation exposure may pose increased risk for cancer. PolyU-developed scoliosis imaging technology Ir Professor ZHENG Yong-ping, Head of BME and Henry G. Leong Professor in Biomedical Engineering, who leads the research, said Scolioscan Air is a further advanced system based on the PolyU-developed 3D ultrasound imaging technology under the trademark “Scolioscan” (weighed about 150 kg). “Scolioscan” was successfully commercialised into a clinic-based facility in 2016. Being radiation-free and more cost-effective than prevailing X-ray imaging technologies, Scolioscan can facilitate mass screening and frequent follow-up monitoring. Clinical trials have proven the novel technology is very reliable, with accuracy of curve measurement comparable to X-ray assessment.2 3 Moreover, it can obtain image in any postures, provide vertebra rotation and muscle-related information, and form a 3D spinal model for the three-dimensional analysis of deformity of spine. All these cannot be achieved by X-ray imaging systems commonly used at present. Scolioscan can also be applied to conducting prognosis and monitoring treatment outcomes for each scoliosis patient so as to establish personalised treatment plan. Palm-sized Scolioscan Air facilitates screening anywhere, anytime The research team has recently applied the novel technology to a portable palm-sized Scolioscan Air they further developed, which weighed only 5 kg. “With this innovation, we can now literally bring the device and mass screening service to the youngsters anywhere, anytime. It would facilitate the implementation of school-based scoliosis screening to detect and treat spinal curvatures before they become severe enough to cause chronic pain or other health issues among adolescents,” said Professor Zheng. “Moreover, when providing non-surgical treatment for scoliosis patients, healthcare personnel can use Scolioscan Air to conduct real-time assessment, so as to optimise the treatment outcome.” Scolioscan Air consists of three hardware components: i) a palm-sized wireless ultrasound probe with an optical marker mounted at its bottom; ii) a depth camera; and iii) a laptop or tablet computer with dedicated software. The compact optical marker and depth camera replace the spatial sensor used in Scolioscan and thus help dramatically downsize the device. In addition, the technology for 3D ultrasound image reconstruction, visualisation and measurement, including a fully automatic curvature measurement method and 3D spinal deformity analysis software, developed by the team earlier can also be applied to Scolioscan Air. The newly developed optical 3D spatial tracking method for Scolioscan Air achieves a high degree of accuracy, which is comparable with Scolioscan. Moreover, the technological compatibility makes Scolioscan Air readily available for commercialisation for popular use. With dramatically reduced material cost, size and weight compared with other scanning systems, Scolioscan Air can be carried within a suitcase. Scolioscan has been registered as a medical device in different countries since 2016, including European Union and Australia. A total of 23 patents globally for the related technology have been awarded to, or filed by, PolyU and the collaborating company. The clinic-based systems have been installed in clinics in Hong Kong, Macau, the Mainland, Netherlands, Australia, Italy, etc; and have been used for scoliosis scanning for over 4,000 patients. Members of the PolyU research team of Scolioscan Air include Mr MENG Qiang, Mr Derek YANG De, Mr Joseph HUI Chi-ho, and Mr Henry WONG Yiu-hang. Note: Video on “Scolioscan Air”   [From PolyU Media Release] Related News Articles: 理大研發便攜式三維超聲波成像系統助大規模篩查脊柱側彎及監察病情和療效 [晴報 (Sky Post) / 星島日報 (Sing Tao Daily) / 明報 (Ming Pao Daily News) / 香港01 (HK01)] 準確度媲美X光 緊密追蹤病情 無輻射超聲波 30秒檢測脊柱側彎 [明報 (Ming Pao Daily News)]

Belt and Road Advanced Professionals graduated from University-Industry Collaborated Programme of PolyU-XJTU Silk Road International School of Engineering

Senior professionals from 12 countries/regions have benefited from the Belt and Road Advanced Professional Development Programme in Power and Energy run by The Silk Road International School of Engineering (SRISE) for the second consecutive year. The graduation ceremony for the 25 participants staged today on The Hong Kong Polytechnic University (PolyU) campus was officiated by Mr Matthew CHEUNG Kin-chung, Chief Secretary for Administration of the Hong Kong Special Administrative Region. The three-year Programme run by SRISE — a joint establishment of PolyU and Xi'an Jiaotong University (XJTU) — in partnership with State Grid Corporation of China (State Grid) and The Hongkong Electric Company, Limited (HK Electric) is the first cross-regional and multi-cultural project of its kind in Chinese Mainland and Hong Kong, and the first university-industry collaboration project of SRISE. Over the past two weeks, the 25 professionals in power and energy sector participated in field-trip studies and exchanges in Xi'an, Jinan and Hong Kong. Newly joining the Programme this year were participants from four nations, namely Brazil, Myanmar, Nigeria and Tanzania. The participants include senior executives from enterprises or government agencies, as well as veteran academics and researchers. Other officiating guests at the graduation ceremony today were: Dr Lawrence LI Kwok-chang, Deputy Council Chairman of PolyU; Professor XI Guang, Vice President, Xi'an Jiaotong University; Mr SU Qingmin, Director, Management Centre of Education Affairs, State Grid of China Technology College; and Mr WAN Chi-tin, Managing Director of HK Electric. Mr LIU Zhiming, Deputy Inspector, Department of Educational, Scientific and Technological Affairs, Liaison Office of the Central People's Government in the HKSAR,as well as a number of Consulate Generals or representatives from the Belt and Road region, including Malaysia, Russia and Tanzania, were also present. Addressing the ceremony, Mr Matthew CHEUNG Kin-chung, Chief Secretary for Administration of the HKSAR, said, "Embedded with 'five areas of connectivity', namely policy co-ordination, financial integration, unimpeded trade, facilities connectivity and people-to-people bonds, the Belt and Road Initiative provides new impetus not only to the global economy, but also sustainable development. I believe that as part of PolyU's Belt and Road Strategic Platform, this Programme echoes well with one of the key focuses of the Initiative on the establishment of energy partnerships. Hong Kong has a unique role to play in this vision. The strengths of Hong Kong's energy sector in system operation, manpower development and project financing are most pertinent." Dr Lawrence LI Kwok-chang, Deputy Council Chairman of PolyU, said, "The Belt and Road Initiative is a powerful engine that not only provides numerous opportunities of development, but also creates a huge demand for professional talents. Obviously, engineers are highly sought after. As PolyU excels in the engineering discipline, we are keen to capitalize on our strengths to support the training of engineers from Chinese Mainland as well as the Belt and Road countries……We need partners in order to do a good job. We are therefore very honoured to have partners from the higher education sector and industry in both Chinese Mainland and Hong Kong to run this professional development programme." Professor XI Guang, Vice President, Xi'an Jiaotong University, said, "Through this Programme, we hope to strengthen the cooperation in technology spectrum among Belt and Road countries/regions, and to introduce a new model for university-enterprise and university-community collaboration. We also aim to implement the work plans under the University Alliance of the Silk Road framework, so as to contribute towards nurturing elite talents with global vision." Mr SU Qingmin, Director, Management Centre of Education Affairs, State Grid of China Technology College, said, "The first workshop run jointly by XJTU, PolyU, HK Electric and State Grid Technology College in April last year has received very good feedback. This year, with great enthusiasm, the four partners have meticulously planned a series of technological lectures, field trips and cultural exchange events in Xi'an, Jinan and Hong Kong. State Grid Technology College has been responsible for the 4-day activities in Jinan. We are very proud to have such opportunity to share with backbone members and elites from the industry, universities and government sector."    Mr WAN Chi-tin, Managing Director of HK Electric said the company has been providing safe and reliable power supply for Hong Kong with a world-class reliability record of over 99.999% for 22 years consecutively. "As Hong Kong is taking steps to become a Smart City, we are keen to enable our customers to use energy smartly. That is why we are investing in infrastructure that promotes the widespread adoption of information and communication technologies.  And in line with the Government's Smart City initiatives, we plan to roll out smart meters for most of our customers over the next 7 years. Through this workshop, we are happy to share with our visitors our unique experiences, " he said. This year's Programme focused on "Ultra High Voltage, Smart Grid and Electricity Infrastructure for Resilient City". The participants had field-trip study at the State Key Laboratory of Electrical Insulation and Power Equipment in Xi'an, as well as various practical training facilities of State Grid in Jinan. In Hong Kong, they visited the System Control Centre and Lamma Power Station of HK Electric, and have exchanges with PolyU academia on Artificial Intelligence for Electricity Supply. The 11-day Programme enabled them to learn about cutting-edge technologies, modern management system and advanced design of the cities' special power supply facilities, and to gain practical knowledge and experiences from veteran academics and professionals from PolyU, XJTU, State Grid and HK Electric.   [From PolyU Media Release] Related News Articles: 張建宗：港成「一帶一路」專才平台 [香港商報 (Hong Kong Commercial Daily)]

PolyU develops unique electrostatically charged nanofiber with enhanced performance in filtering airborne pollutants and viruses

The Department of Mechanical Engineering of The Hong Kong Polytechnic University (PolyU) has recently developed an electrostatically charged nanofiber filter with multiple separator layers, which can capture pollutant particles that are below 100 nm in diameter (covering the most common airborne nano-particles and viruses). The novel nanofiber filter demonstrates better performance in terms of breathability, filtration efficiency (10% higher than the conventional electret microfiber filter), and shelf life (up to 90 days). Nano-aerosols of 100 nm and below in diameter exist everywhere in urban environments, and by virtue of their small sizes, can be easily inhaled into human bodies. Most airborne viruses, from influenza to epidemic viruses like Swine Flu or SARS, are also in the size range of 100 nm. It remains a challenging mission for scientists to develop user-friendly air filter or mask for effective capture of nano-particles and to protect people from harmful airborne contaminants and viruses that may affect health. The team led by Ir. Professor Wallace Leung Woon-Fong, Chair Professor of Innovative Products and Technologies, used and tested polyvinylidene fluoride (PVDF), a semi-crystalline thermoplastic commonly used as insulation on electrical wires, to fabricate nanofiber filters. Applying innovative technology in Corona Discharge, the team imparted electrostatic charges onto PVDF nanofiber, to induce electrical interaction with aerosols in close distance and capture the aerosols efficiently. Comparing with other filters made with charged microfibers or uncharged fibers on the market, PolyU’s novel filter have much enhanced filtration efficiency, yet without increasing pressure drop over time (higher pressure drop means a filter facing higher airflow resistance, and thus being less breathable for the mask user or reduced flow rate for a space filter). The PVDF nanofiber has proved to be stably charged, with charging effect staying for almost three months. In prior literatures on charging other nanofibers, the imparted charges usually dissipate within a day. Charged PVDF nanofiber filter In filtration tests for aerosols of various sizes conducted by the PolyU team, the charged PVDF nanofiber filter demonstrated pressure drop of only 5 Pa (Pascal / unit of pressure) and a filtration efficiency of about 54% for the 100 nm particle (i.e. after the air flow through the filter, 54% of the nano-particles of 100 nm in diameter being trapped), compared to 17% of non-charged PVDF nanofiber filter. There was also a 2.7 fold increase in “quality factor” — the ratio of filtration efficiency over pressure drop, or the benefit-to-cost ratio. The higher the quality factor, the better is the filter’s performance taking into account the importance of both filtration and breathability. Professor Leung said as viruses usually carry negative electrostatic charges, they can be captured very effectively by the positively charged PVDF nanofibers. “The filter or face mask applying our innovation would therefore be an ideal defense against virus during an outbreak.” Novel multiple electrostatic separator layers To further strengthen the electrostatic capture performance of the filter, the research team developed the configuration of multiple electrostatic separator layers — distributing the same weight of PVDF nanofibers in a single-layer filter into several filter layers with each layer insulated by a separator, in order to reduce the electrostatic interference among fibers of adjacent layers and increase the filter efficiency by electrostatic force. Filtration tests showed that filtration efficiency of the filters with charged multiple electrostatic separator layers (tests on two, three and four-layer) were 39% to 45% higher than the charged filter without the separator. Quality factor of the filters with charged multiple electrostatic separator layers were 2 to 3.5 times higher than the one without the separator. Stability and durability Charge on filter medium and its related electrostatic effect will dissipate with time. Filter durability test proved that PolyU’s novel electrostatically charged nanofiber filter with multiple separator layers could maintain a persistently high performance for an extended period, and is thus more durable and can store for a longer time. Filtration efficiency tests in humid ambient of 80% relative humidity (Hong Kong’s average annual percentage of humidity is 77.0%) for filters with four electrostatic separator layers (with 1.75 grams of fibers per square meter) showed that the filtration efficiency dropped only marginally after 15 days, and dropped only 1% after 90 days. Potential applications PolyU’s innovation can be widely applied in air filtration, from industrial to personal and household applications. Industrial usage includes dust-free rooms and fossil-fuel power stations. Air filtration can also be used to reduce particulate emission from exhaust of ships and vehicles. Personal and household usage of air filtration includes facemask, air purifier, vacuum cleaner, window filter screen, etc. The electret PVDF nanofiber filter can be used in Western Blot, an analytical technique widely used to detect or extract proteins. In the process, PVDF membrane is often used in transferring proteins separated from the original sample. The PolyU innovation can help greatly enhance the nanofiber mat’s electrostatic force in capturing protein, while maintaining the protein integrity without affecting its organization. The innovation can also be applied to effective release of protein-based drugs. Drugs made in powder form, for example asthma drug, can be captured electrostatically by the charged PVDF nanofiber mat for more effective release and inhalation by users. Other than drugs delivered by inhalation, the innovation can also be applied similarly to drugs for use topically over skin.   [From PolyU Media Release] Related News Articles: 理大研納米口罩 隔絕麻疹流感病毒 [星島日報 (Sing Tao Daily)] 理大研靜電納米口罩 過濾效率高一成 [明報 (Ming Pao Daily News)]

HK innovation to make world rail travel safer

中國日報香港版 (China Daily Hong Kong Edition)