18 research outputs found
BENDING FATIGUE BEHAVIOR OF AG NANOWIRE/CU THIN-FILM HYBRID INTERCONNECTS FOR WEARABLE ELECTRONICS
No full textEnhancing the mechanical reliability of metal interconnects is important for achieving highly reliable flexible/wearable electronic devices. In this study, Ag nanowire and Cu thin-film hybrid interconnects were explored as a novel concept to enhance mechanical reliability under bending fatigue. Bending fatigue tests were conducted on the Cu thin films and Cu/Ag nanowire/polyimide (CAP) interconnects. The increase in resistance was larger for the Cu thin films than for the CAP. The single-component Cu electrodes showed multiple crack initiation and propagation due to bending strain, which degraded the electrical conductivity. In CAP, however, no long-range cracks were observed, even after 300,000 cycles of bending, although a wavy structure was observed, probably due to the delamination of the Ag nanowires under repeated bending. Our study confirms that flexible Ag nanowire and metal thin-film hybrids can enhance the mechanical reliability of metal thin-film interconnects under bending fatigue
Multiplexed detection of pathogenic RNAs based on microfluidic cell-free protein synthesis
No full textHigh-throughput monodisperse droplet generation using a pushbutton-activated millipede microfluidic device
No full textProprioception, the regulator of motor function
No full textIn animals, proper locomotion is crucial to find mates and foods and avoid predators or dangers. Multiple sensory systems detect external and internal cues and integrate them to modulate motor outputs. Proprioception is the internal sense of body position, and proprioceptive control of locomotion is essential to generate and maintain precise patterns of movement or gaits. This proprioceptive feedback system is conserved in many animal species and is mediated by stretch-sensitive receptors called proprioceptors. Recent studies have identified multiple proprioceptive neurons and proprioceptors and their roles in the locomotion of various model organisms. In this review we describe molecular and neuronal mechanisms underlying proprioceptive feedback systems in C. elegans, Drosophila, and mice. © 2021 by the The Korean Society for Biochemistry and Molecular Biology. All Rights Reserved.1
On-chip microfluidic retrorefelctive Janus particle detection of pathogenic rRNAs using cell-free protein synthesis
No full textPushbutton-activated microfluidic platform for IA–TASER-based retroreflective Janus particle detection of pathogenic rRNAs
No full textHomeownership and life stability of expatriates in Hong Kong : a grounded theory analysis
No full textHomeownership is an important life milestone for most people and it can be an even greater milestone for expatriates who live outside of their home countries. This research focuses on understanding the significance of this topic by tracking and analysing the life trajectories of homeowner expatriates starting from when they first arrive in the destination country. More specifically, this dissertation investigates how living in a rented home and a self-owned home (types of housing tenure) relates to various aspects of their emotional subjective well-being. The expatriates studied in this research come from different parts of the world from various backgrounds and are all found in Hong Kong, one of the most expatriate-heavy metropoles in Asia and globally.
This study applies the methodology of Grounded Theory; data has been collected from a spectrum of circumstances and an iterative process of comparison and analysis has been conducted to conceptualize a theory on the life stability of expatriates. Research participants are current homeowners and expatriates who have lived in rented properties in Hong Kong. Most expatriates arrive in their destination country without a house of their own. The life stability theory of expatriates elaborates on the significance of life stability in pursuing happiness and emotional subjective well-being, and how homeownership is a critical element in the life stability for expatriates. This theory applies to relatively high-income immigrants defined as expatriates in this study, differentiating itself with existing related research on housing is focused on low-income immigrants. Based on true life stories of expatriates in Hong Kong, this study aims to share a unique perspective and philosophy on the topic of homeownership of expatriates and how it relates to their life stability and emotional subjective well-being.published_or_final_versionReal Estate and ConstructionDoctoralDoctor of Philosoph
Organic material-derived activated carbon for ecofriendly mulberry paper supercapacitor
No full textPaper has gained increasing attention as promising flexible substrate for deformable energy storage systems. However, since low mechanical strength and chemical resistance of commercial paper limited its practical application, mulberry paper (MP) has alternatively studied, which exhibits high holocellulose content, hydrophilicity, and strong bonding with active material. Herein, we prepared activated carbon (AC) using a one of common waste, orange peel (OP), and coated it on MP with additional coating of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), thereby, fabricating hybrid-coated MP for supercapacitor. The prepared AC exhibited enlarged surface area from 1.774 to 986.010 m2/g, and increased total pore volume of 0.639 cm3/g. Furthermore, additional coating of pseudocapacitive material enhanced electrochemical performance. Specific areal capacitance increased approximately 2.3 times, especially showing 78.95 ± 3.04 mF/cm2 under scan rate of 100 mV/s. Moreover, fabricated electrode exhibited enhanced energy density of 3.01 µW h/cm2 at current density of 0.5 mA/cm2, thereby, complementing low energy density of electric double layer (EDL) capacitive material. This approach, which combines biomass-derived AC and MP with hybrid PEDOT:PSS coating, presents a promising pathway for next-generation sustainable energy storage systems
Social Sustainability and Redevelopment of Urban Villages in China: A Case Study of Guangzhou
No full textRapid economic development in China has generated substantial demand for urban land for development, resulting in an unprecedented urbanization process. The expansion of urbanized cities has started to engulf rural areas, making the urban–rural boundary less and less conspicuous in China. Urban encroachment has led to a rapid shrinkage of the rural territory as the rural–urban migration has increased due to better job opportunities and living standards in the urban cities. Urban villages, governed by a rural property rights mechanism, have started to emerge sporadically within urbanised areas. Various approaches, such as state-led, developer-led, or collective-led approaches, to redevelop these urban villages have been adopted with varying degrees of success. This paper uses a case-study framework to analyse the state–market interplay in two very different urban village redevelopment cases in Guangzhou. By an in-depth comparative analysis of the two regeneration cases in Guangzhou, which started within close proximity in terms of geographical location and timing, we are able to shed light on how completely different outcomes may result from different forms of state–market interplay. It is found that a neoliberal policy approach that aims at coordinating state resources with market forces rather than discarding the state’s role provides a more satisfactory outcome in urban village redevelopment when there are a lot of stakeholders involved each with different agendas. The state maintains a good balance of the power-play in the process with a clear and supportive policy and regulatory guidance, leaving the market to function more effectively and satisfactorily in effectuating capital flow for the project, which helps to achieve sustainable outcomes
Etching-free fabrication method for silver nanowires-based SERS sensors for enhanced molecule detection
No full textSurface-enhanced Raman spectroscopy (SERS) has garnered increasing attention for its ability to detect molecules even at low concentrations; however, the fabrication methods for SERS sensors require further study aimed at simple and rapid on-body and environmental monitoring. In this context, we propose an etching-free method for fabricating silver nanowires (AgNWs)-SERS sensors based on AgNWs. A lift-off process was conducted to create a pattern without etching, and lamination of the dry film resist overcame the limitations associated with liquid photoresists. Consequently, the resulting AgNW-patterned substrate was used to evaluate the pH of the test solution in the range of 1.1 and 12.0 and exhibited a Raman signal enhancement of 2 × 106. This fast and cost-effective fabrication method, combined with the intrinsic flexibility of the substrate and rapid and reproducible response to pH variations, provides a foundation for applying AgNW-patterned substrates for microenvironmental analysis or developing wearable optical devices
