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61.
Yunzhi Ling Tiance An Lim Wei Yap Bowen Zhu Shu Gong Wenlong Cheng 《Advanced materials (Deerfield Beach, Fla.)》2020,32(18):1904664
The wearable industry is on the rise, with a myriad of technical applications ranging from real-time health monitoring, the Internet of Things, and robotics, to name but a few. However, there is a saying “wearable is not wearable” because the current market-available wearable sensors are largely bulky and rigid, leading to uncomfortable wearing experience, motion artefacts, and poor data accuracy. This has aroused a world-wide intensive research quest for novel materials, with the aim of fabricating next-generation ultra-lightweight and soft wearable devices. Such disruptive second-skin-like biosensing technologies may enable a paradigm shift from current wearable 1.0 to future wearable 2.0 products. Here, the state-of-the-art progress made in the key phases for future wearable technology, namely, wear → sense → communicate → analyze → interpret → decide, is summarized. Without a doubt, materials innovation is the key, which is the main focus of the discussion. In addition, emphasis is also given to wearable energy, multicomponent integration, and wireless communication. 相似文献
62.
Cheah Kit Hwa Nisar Humaira Yap Vooi Voon Lee Chen-Yi 《Neural computing & applications》2020,32(13):8867-8891
Neural Computing and Applications - This paper highlights the ability of convolutional neural networks (CNNs) at classifying EEG data listening to different kinds of music without the requirement... 相似文献
63.
Kaixuan Wang Lim Wei Yap Shu Gong Ren Wang Stephen Jia Wang Wenlong Cheng 《Advanced functional materials》2021,31(39):2008347
A virtual world has now become a reality as augmented reality (AR) and virtual reality (VR) technology become commercially available. Similar to how humans interact with the physical world, AR and VR systems rely on human–machine interface (HMI) sensors to interact with the virtual world. Currently, this is achieved via state of-the-art wearable visual and auditory tools that are rigid, bulky, and burdensome, thereby causing discomfort during practical application. To this end, a skin sensory interface has the potential to serve as the next-generation AR/VR technology because skin-like wearable sensors have advantages in that they can be ultrathin, ultra-soft, conformal, and imperceptible, which provides the ultimate comfort and immersive experience for users. In this progress report, nanowire-based soft wearable HMI sensors including acoustic, strain, pressure sensors, and physiological sensors are reviewed that may be adopted as skin sensory inputs in future AR/VR systems. Further, nanowire-based soft contact lenses, haptic force, and thermal and vibration actuators are covered as potential means of feedback for future AR/VR systems. Considering the possible effects of the virtual world on human health, skin-like wearable artery pulses, glucose, and lactate sensors are also described, which may enable imperceptible health monitoring during future AR/VR practices. 相似文献
64.
A polystyrene melt has been extruded through successive capillaries arranged to produce converging and diverging flow patterns through the twin orifices. Applied pressure at fixed mass flow rate through the combined dies is equal to the sum of the pressure drops in the single capillaries in both flow modes. The Bagley end correction was found to apply to each die in the sequence. Bagley plots were linear with a particular upper capillary at given apparent shear rate in the lower die. No effect of shear history could be detected on the viscous behavior of the polymer, but preshearing in converging flow produced a slight reduction in die swell. 相似文献
65.
U-Xuan Tan Veluvolu K.C. Win Tun Latt Cheng Yap Shee Riviere C.N. Wei Tech Ang 《IEEE sensors journal》2008,8(8):1385-1388
Inertial sensors, like accelerometers and gyroscopes, are rarely used by themselves to measure displacement. Accuracy of inertial sensors is greatly handicapped by the notorious integration drift, which arises due to numerical integration of the sensors zero bias error. A solution is proposed in this paper to provide drift free estimation of displacement from inertial sensors. 相似文献
66.
Çiğdem Saydam Eker İbrahim Akpınar Ferkan Sipahi Ejder Yapıcı 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2016,38(11):1643-1652
The element contents and organic matter-element relation between Lias-aged coals exposed in four fields in Gümü?hane and Bayburt were investigated. In general, fixed carbon and gross calorific values of the Edire and Balkaynak coals are higher than Güvercinlik and Çerçi coals. The highest ash yields were observed in the Çerçi coals. The concentrations of Mg, P, Ca, Mo, Y, Ni, U, Zn, Ga, Ba, W, Sr, Ta, and Be of the analysed coals are positively correlated with ash yield, indicating an organic affinity. The Lias-aged coals located in Gümü?hane and Bayburt are low-rank coals. 相似文献
67.
F.A. Halim Yap M.S. Yahya M. Ismail 《International Journal of Hydrogen Energy》2017,42(33):21096-21104
In this work, we have investigated the hydrogen release and uptake pathways storage properties of the MgH2Na3AlH6 with a molar ratio of 4:1 and doped with 10 wt% of TiF3 using a mechanical alloying method. The doped composite was found to have a significant reduction on the hydrogen release temperature compared to the un-doped composite based on the temperature-programme-desorption result. The first stage of the onset desorption temperature of MgH2Na3AlH6 was reduced from 170 °C to 140 °C with the addition of the TiF3 additive. Three dehydrogenation steps with a total of 5.3 wt% of released hydrogen were observed for the 4MgH2Na3AlH6-10 wt% TiF3 composite. The re/dehydrogenation kinetics of 4MgH2Na3AlH6 system were significantly improved with the addition of TiF3. Kissinger analyses showed that the apparent activation energy, EA, of the 4MgH2Na3AlH6 doped composite was 124 kJ/mol, 16 kJ/mol and 34 kJ/mol lower for un-doped composite and the as-milled MgH2, respectively. It was believed that the enhancements of the MgH2Na3AlH6 hydrogen storage properties with the addition of TiF3 were due to formation of the NaF, the AlF3 and the Al3Ti species. These species may played a synergetic catalytic role in improving the hydrogenation properties of the MgH2Na3AlH6 system. 相似文献
68.
Seong Shan Yap Wee Ong SiewChen Hon Nee Turid Worren ReenaasTeck Yong Tou 《Thin solid films》2012,520(8):3266-3270
In this work, we investigated the laser ablation and deposition of Si and Ge at room temperature in vacuum by employing nanosecond lasers of 248 nm, 355 nm, 532 nm and 1064 nm. Time-integrated optical emission spectra were obtained for neutrals and ionized Ge and Si species in the plasma at laser fluences from 0.5 to 11 J/cm2. The deposited films were characterized by using Raman spectroscopy, scanning electron microscopy and atomic force microscopy. Amorphous Si and Ge films, micron-sized crystalline droplets and nano-sized particles were deposited. The results suggested that ionized species in the plasma promote the process of subsurface implantation for both Si and Ge films while large droplets were produced from the superheated and melted layer of the target. The dependence of the properties of the materials on laser wavelength and fluence were discussed. 相似文献
69.
Climate change is fast becoming the major environmental and energy concern worldwide. There is a major dilemma between the continued reliance on fossil fuel for our energy supply and the pressing need to address the problem of greenhouse gas (GHG) emissions from combustion process. This paper reviews the potential for carbon capture and storage (CCS) as a part of the climate change mitigation strategy for the Malaysian electricity sector using a technology assessment framework. The nation's historical trend of high reliance on fossil fuel for its electricity sector makes it a prime candidate for CCS adoption. The suitability and practicality of the technology was reviewed from a broad perspective with consideration of Malaysia-specific conditions. It is apparent from this assessment that CCS has the potential to play an important role in Malaysia's climate change mitigation strategy provided that key criteria are fulfilled. 相似文献
70.
Hock Guan TAN Cheng Yap SHEE Keng He KONG Cuntai GUAN Wei Tech ANG 《Frontiers of Mechanical Engineering》2011,6(1):71
This paper describes the Brain Computer Interface (BCI) system and the experiments to allow post-acute (<3 months) stroke patients to use electroencephalogram (EEG) to trigger neuromuscular electrical stimulation (NMES)-assisted extension of the wrist/fingers, which are essential pre-requisites for useful hand function. EEG was recorded while subjects performed motor imagery of their paretic limb, and then analyzed to determine the optimal frequency range within the mu -rhythm, with the greatest attenuation. Aided by visual feedback, subjects then trained to regulate their mu -rhythm EEG to operate the BCI to trigger NMES of the wrist/finger. 6 post-acute stroke patients successfully completed the training, with 4 able to learn to control and use the BCI to initiate NMES. This result is consistent with the reported BCI literacy rate of healthy subjects. Thereafter, without the loss of generality, the controller of the NMES is developed and is based on a model of the upper limb muscle (biceps/triceps) groups to determine the intensity of NMES required to flex or extend the forearm by a specific angle. The muscle model is based on a phenomenological approach, with parameters that are easily measured and conveniently implemented. 相似文献