Inspired by the Mimosa plant’s folding response to touch, researchers have engineered a material that folds when in contact with water.
Many of us have fond childhood memories of poking the ubiquitous Mimosa pudica plant’s leaflets, then exclaiming in delight when they fold up at even the slightest touch. This spontaneous, protective motion, which is more complicated than it looks, is triggered by a cascade of reactions and pressure waves. Now, researchers from Hong Kong and Australia have drawn inspiration from the ever-so-sensitive plant to develop self-organizing soft materials that fold themselves into predetermined shapes when wet.
The study is published in the journal Science Advances.
City University of Hong Kong (Abbreviation: CityU; Chinese: 香港城市大學) is a public research university located in Kowloon, Hong Kong, in the affluent neighborhood of Kowloon Tong.
It was founded in 1984 as City Polytechnic of Hong Kong and became a fully accredited university in 1994. It is one of the eight government-funded degree-granting tertiary institutions.
City University of Hong Kong is organized into three colleges and four schools, including College of Business, College of Liberal Arts and Social Sciences, College of Science and Engineering, School of Creative Media, School of Energy and Environment, School of Law, and School of Veterinary Medicine which was established in partnership with Cornell University. CityU offers over 50 bachelor’s degree programmes through its constituent colleges and schools. It also offers dual degree programs with world renowned universities such as Columbia University. Postgraduate degree programmes are offered by the Chow Yei Ching School of Graduate Studies.
City University of Hong Kong is globally recognised as a top institution of higher learning and research. CityU is ranked #57 in the world in the QS World University Rankings. In particular, the College of Business is well known for their cutting-edge research. It is ranked #57 in the world and #2 in Asia by the U.S. News & World Report. It is also ranked #33 in the world and #2 in Asia in the UTD Top 100 Business School Research Ranking.
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City University of Hong Kong research articles from Innovation Toronto
An international team of scientists has set a new record for the complexity possible on a quantum computing chip, bringing us one step closer to the ultra-secure telecommunications of the future.
A key component of quantum science and technology is the notion of entangled particles – typically either electrons or particles of light called photons. These particles remain connected even if separated over large distances, so that actions performed by one affect the behaviour of the other.
In a paper, published today in the journal Science, the research team outlines how it created entangled photon states with unprecedented complexity and over many parallel channels simultaneously on an integrated chip.
Importantly, the chip was also created with processes compatible with the current computer chip industry, opening up the possibility of incorporating quantum devices directly into laptops and cell phones.
The researchers were led by Professor David Moss, the newly appointed Director of the Centre for Micro-Photonics at Swinburne University of Technology, and Professor Roberto Morandotti from the Institut National de la Recherche Scientifique (INRS-EMT) in Montreal, Canada.
The researchers used ‘optical frequency combs’ which, unlike the combs we use to detangle hair, actually help to ‘tangle’ photons on a computer chip.
Their achievement has set a new record in both the number and complexity of entangled photons that can be generated on a chip to help crack the code to ultra-secure telecommunications of the future.
It also has direct applications for quantum information processing, imaging, and microscopy.
“This represents an unprecedented level of sophistication in generating entangled photons on a chip,” Professor Moss says.
“Not only can we generate entangled photon pairs over hundreds of channels simultaneously, but for the first time we’ve succeeded in generating four-photon entangled states on a chip.”
Professor Morandotti says the breakthrough is the culmination of 10 years of collaborative research on complementary metal–oxide–semiconductor (CMOS) compatible chips for both classical and quantum nonlinear optics.
“By achieving this on a chip that was fabricated with processes compatible with the computer chip industry we have opened the door to the possibility of bringing powerful optical quantum computers for everyday use closer than ever before,” Professor Morandotti says.
The groundwork for the research was completed while Professor Moss was at RMIT. The collaboration includes the City University of Hong Kong, University of Sussex and Herriot Watt University in the UK, Yale University, and the Xi’an Institute in China.
A team of Chinese scientists evaluates the impact of a website based on the interaction between its users with the entire Web
A new study shows that small websites, in terms of daily user flux based on number of clicks, have a disproportionally high impact when it comes to traffic generation and influence compared to larger websites. These findings, about to be published in EPJB, have implications for estimating the value of sites and related advertising revenue. They result from the work of Lingfei Wu from the City University of Hong Kong and Jiang Zhang from the School of Management, at Beijing Normal University, China.
Previous studies have analysed hyperlinks, while individual browsing records provide insight for understanding local surfing behaviour. However, they fail to provide information on more internet-wide collective browsing behaviour. Hence, to understand the complex interactions between websites, it is necessary to analyse the transportation of traffic, referred to as the flow of clickstreams between websites.
In this study, the authors analyse the clickstream networks composed of the 1,000 most popular websites. They rely on models of clickstream networks based on so-called Markov matrices. They then validate their findings through network flow analysis, tracking users’ movement.
Wu and Zhang found that the accessibility of websites in the clickstream network increases more slowly than the level of traffic for the sites studied. Unlike previously thought, this study based on clickstreams reveals that the web is not solely dominated by a few hubs. And relatively small sites have a greater chance of acquiring popularity than larger ones.