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"Wu, Fan"
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An Internet-of-Things (IoT) Network System for Connected Safety and Health Monitoring Applications
This paper presents a hybrid wearable sensor network system towards the Internet of Things (IoT) connected safety and health monitoring applications. The system is aimed at improving safety in the outdoor workplace. The proposed system consists of a wearable body area network (WBAN) to collect user data and a low-power wide-area network (LPWAN) to connect the WBAN with the Internet. The wearable sensors in the WBAN are exerted to measure the environmental conditions around the subject using a Safe Node and monitor the vital signs of the subject using a Health Node. A standalone local server (gateway), which can process the raw sensor signals, display the environmental and physiological data, and trigger an alert if any emergency circumstance is detected, is designed within the proposed network. To connect the gateway with the Internet, an IoT cloud server is implemented to provide more functionalities, such as web monitoring and mobile applications.
Journal Article
Shinjuku incident
\"A simple Chinese immigrant wages a perilous war against one of the most powerful criminal organizations on the planet in this sprawling action drama directed by Derek Yee (One Night in Mongkok) and starring Jackie Chan, Daniel Wu, and Masaya Kato. In Japan, foreign migrants are shunned by mainstream society. Taunted by the yakuza, they live in constant fear of being discovered and repatriated. Into this world ventures Steelhead (Chan), a humble tractor repairman who has traveled to Tokyo in search of his missing girlfriend, Xiu Xiu (Xu Jinglei), who vanished into thin air shortly after arriving in the city. After locating his brother Joe (Daniel Wu), Steelhead discovers that Xiu Xiu has adapted a Japanese identity and married up-and-coming yakuza chief Eguchi (Masaya Kato), with whom he forms an uneasy alliance. Over time, Steelhead earns the respect of his fellow Chinese immigrants by establishing a place for them to gather. But the dark side still beckons to Steelhead, because after helping Eguchi dispense with a powerful rival, he is granted full control of Shinjuku's most popular nightspots. Resistant to the allure of the criminal lifestyle, Steelhead discovers a new love and opens a tractor-repair business just outside the city. When Eguchi begins using Steelhead's former compatriots as pawns to front the yakuza's drug trade, the vengeful immigrant returns to the city determined to exact justice, even if it means destroying the future of the woman he once loved\"--Allmovie.com, viewed October 18, 2018.
DVD
Thermodynamic theory of highly multimoded nonlinear optical systems
Lately, there has been a resurgence of interest in nonlinear multimode optical systems. The sheer complexity emerging from the presence of a multitude of nonlinearly interacting modes has led not only to new opportunities in observing a host of novel optical effects but also to new theoretical challenges in understanding their collective dynamics. Here, we present a consistent thermodynamical framework capable of describing in a universal fashion the exceedingly intricate behaviour of such photonic configurations. In this respect, we derive new equations of state and show that both the ‘internal energy’ and optical power always flow in accord to the second law of thermodynamics. The laws governing isentropic processes are derived and the prospect for realizing Carnot-like cycles is presented. In addition to shedding light on fundamental issues, our work may pave the way towards a new generation of high-power multimode optical structures and could have ramifications in other disciplines, such as Bose–Einstein condensates and optomechanics.
Journal Article
Progress in thermal stability of all‐solid‐state‐Li‐ion‐batteries
Thermal safety is one of the major issues for lithium‐ion batteries (LIBs) used in electric vehicles. The thermal runaway mechanism and process of LIBs have been extensively studied, but the thermal problems of LIBs remain intractable due to the flammability, volatility and corrosiveness of organic liquid electrolytes. To ultimately solve the thermal problem, all‐solid‐state LIBs (ASSLIBs) are considered to be the most promising technology. However, research on the thermal stability of solid‐state electrolytes (SEs) is still in its initial stage, and the thermal safety of ASSLIBs still needs further validation. Moreover, the specified reviews summarizing the thermal stability of ASSLIBs and all types of SEs are still missing. To fill this gap, this review systematically discussed recent progress in the field of thermal properties investigation for ASSLIBs, form levels of materials and interface to the whole battery. The thermal properties of three major types of SEs, including polymer, oxide, and sulfide SEs are systematically reviewed here. This review aims to provide a comprehensive understanding of the thermal stability of SEs for the benign development of ASSLIBs and their promising application under practical operating conditions. Thermal failure is a serious issue for liquid‐electrolyte‐based lithium‐ion batteries, and substituting liquid electrolytes with solid‐state electrolytes is expected to solve this problem. This review summarizes the thermal stability of polymers, oxides, sulfides, and other solid‐state electrolytes from the level of material, interface, and battery, and points out the limitations and future of thermal stability studies in solid‐state batteries.
Journal Article
Realizing long-cycling all-solid-state Li-In||TiS2 batteries using Li6+xMxAs1-xS5I (M=Si, Sn) sulfide solid electrolytes
Inorganic sulfide solid-state electrolytes, especially Li
6
PS
5
X (X = Cl, Br, I), are considered viable materials for developing all-solid-state batteries because of their high ionic conductivity and low cost. However, this class of solid-state electrolytes suffers from structural and chemical instability in humid air environments and a lack of compatibility with layered oxide positive electrode active materials. To circumvent these issues, here, we propose Li
6+x
M
x
As
1-x
S
5
I (M=Si, Sn) as sulfide solid electrolytes. When the Li
6+x
Si
x
As
1-x
S
5
I (x = 0.8) is tested in combination with a Li-In negative electrode and Ti
2
S-based positive electrode at 30 °C and 30 MPa, the Li-ion lab-scale Swagelok cells demonstrate long cycle life of almost 62500 cycles at 2.44 mA cm
−2
, decent power performance (up to 24.45 mA cm
−2
) and areal capacity of 9.26 mAh cm
−2
at 0.53 mA cm
−2
.
Stable inorganic solid-state electrolytes are crucial for reliable all-solid-state battery development. Here, the authors report a Li-In|Li
6.8
Si
0.8
As
0.2
S
5
I|Ti
2
S lab-scale cell with a long cycle life of almost 62500 cycles at 2.44 mA cm
−2
, 30 °C and 30 MPa.
Journal Article
Physics of highly multimode nonlinear optical systems
Linear multimode optical systems have enabled clean experimental observations and the applications of numerous phenomena that continually extend the boundaries of wave physics. The infrastructure that has enabled these studies facilitates the study of an even richer world of nonlinear multimode optical systems. Multimode nonlinear optical physics is full of emergent phenomena, including robust spatial attractors, multimode wave instabilities, and conservative and dissipative multimode solitons. Many of these effects push the limits of existing theoretical techniques, demanding new insights and approaches that could emerge from other fields, such as statistical mechanics, physics-informed machine learning, network science and beyond. Here we provide an overview of recent investigations of wave propagation in highly multimode nonlinear systems, principally multimode fibre waveguides and laser cavities. These systems, with their multifaceted control, low cost, scalability and ultrahigh bandwidth, are ideal physical platforms for exploring—and ultimately applying—high-dimensional nonlinear physics, from orderly but elusive objects like spatiotemporal solitons to dynamical complexity itself, both near and far from equilibrium.
Nonlinearities allow the large number of modes in a multimode fibre to interact and create emergent phenomena. This Review presents the breadth of the high-dimensional nonlinear physics that can be studied in this platform.
Journal Article
Direct observations of thermalization to a Rayleigh–Jeans distribution in multimode optical fibres
Nonlinear multimode optical systems support a host of intriguing effects that are impossible in single-mode settings. Although nonlinearity can provide a rich environment where the chaotic power exchange among thousands of modes can lead to novel behaviours, understanding and harnessing these processes to our advantage is challenging. Over the years, statistical models have been developed to macroscopically describe the response of these complex systems. One of the cornerstones of these theoretical formalisms is the prediction of a photon–photon-mediated thermalization process that leads to a Rayleigh–Jeans distribution of mode occupations. Here we report the use of mode-resolved measurement techniques to directly observe the thermalization to a Rayleigh–Jeans power distribution in a multimode optical fibre. We experimentally demonstrate that the underlying system Hamiltonian remains invariant during propagation, whereas power equipartition takes place among degenerate groups of modes—all in full accordance with theoretical predictions. Our results may pave the way towards a new generation of high-power optical sources whose brightness and modal content can be controlled using principles from thermodynamics and statistical mechanics.
Optical nonlinearities in multimodal systems lead to a complex behaviour that can be described as a thermalization process, which is expected to lead to a Rayleigh–Jeans distribution. This process has now been observed in graded-index fibres.
Journal Article
Supercooled erythritol for high-performance seasonal thermal energy storage
Seasonal storage of solar thermal energy through supercooled phase change materials (PCM) offers a promising solution for decarbonizing space and water heating in winter. Despite the high energy density and adaptability, natural PCMs often lack the necessary supercooling for stable, long-term storage. Leveraging erythritol, a sustainable mid-temperature PCM with high latent heat, we introduce a straightforward method to stabilize its supercooling by incorporating carrageenan (CG), a bio-derived food thickener. By improving the solid-liquid interfacial energy with the addition of CG the latent heat of erythritol can be effectively locked at a very low temperature. We show that the composite PCM can sustain an ultrastable supercooled state below −30 °C, which guarantees no accidental loss of the latent heat in severe cold regions on Earth. We further demonstrate that the common ultrasonication method can be used as the key to unlocking the latent heat stored in the CG-thickened erythritol, showing its great potential to serve as a high-performance, eco-friendly PCM for long-term seasonal solar energy storage.
To enable high-performance seasonal thermal energy storage for decarbonized solar heating, the authors propose an effective method to realize ultrastable supercooled erythritol, with an ultrahigh supercooling >150 ˚C, by making it more viscous.
Journal Article