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Forward phase-matched Brillouin optomechanical resonance, excited by a tapered fiber, in a graphene inner-deposited whispering-gallery-mode microfluidic cavity, is demonstrated for the first time. The generated Brillouin optomechanical modes with Q factor ∼ 47000 show extremely high sensitivity (200kHz/ppm) for absolute gas detection based on frequency variation, achieving a detection limit down to...
Nowadays, large computing clusters are executing highly heterogeneous bursty workloads with different priorities, resource demands, and performance objectives. As the schedulers control the class-specific performance by evictions, a noteworthy amount of the computing resources are wasted by the lost executions of the evicted tasks. This paper presents a system model with a slot-based priority scheduler...
Ge n- and p-FinFETs with different interfacial layer ferroelectric HfZrOx (IL-FE-HZO) gate stacks have been demonstrated systematically by various annealing conditions for the first time. Microwave annealing (MWA) not only shows enhanced FE characteristics but also suppresses the gate leakage and Ge interdiffusion compared with conventional rapid thermal annealing (RTA). While HZO on Al2O3 IL results...
The aim of this study is to measure the quality factor (Q) for double-ended tuning fork (DETF) devices dominated by Thermoelastic Dissipation (TED) and width-extensional (WE) devices dominated by Anchor Damping over a wide temperature range. Testing of these two device families over this wide range led to two related findings. First, our results indicate that it is possible to completely account for...
Wimpy virtual instances equipped with small numbers of cores and RAM are popular public and private cloud offerings because of their low cost for hosting applications. The challenge is how to run latency-sensitive applications using such instances, which trade off performance for cost. In this study, we analytically and experimentally show that simultaneously scaling resources at coarse granularity...
This paper reports a high-Q resonant pressure micro sensor with through-silicon-via electrical interconnections. Double "H" type resonators were arranged in a differential pressure sensor where the pressure under measurement was translated to resonant frequency output. The resonators were vacuum packaged through anodic bonding, which produced a high Q factor of the resonators. In order to...
This paper firstly presents an integrated three-axis electrochemical micro seismic sensor, which consists of four sensing units. The direction of the flow is opposite in different channel so that differential current can be calculated. Vertical vibration can also be detected by the addition of the output from four sensing units. Instead of huge volume in conventional three-axis sensor, the integrated...
We present a tunable broadband shoaling mechanical amplifier and a method to extend its operation near the electrostatic pull-in instability. The model has been verified experimentally on a vacuum encapsulated silicon MEMS device. We show that by adding an appropriate mechanical compensation spring, the amplifier can be operated near the pull-in instability in a quasi-linear fashion. Furthermore,...
• Various different classes of fiber (capillary, ARF and PBGF) each with relative merits and drawbacks for specific applications • Significant progress made over recent years in the development of HCF technology — both in terms of understanding and fabrication • Increasing array of applications, with some e.g. power delivery and high power wavelength conversion, close to commercial deployment • Current...
To ensure the scalability of big data analytics, approximate MapReduce platforms emerge to explicitly trade off accuracy for latency. A key step to determine optimal approximation levels is to capture the latency of big data jobs, which is long deemed challenging due to the complex dependency among data inputs and map/reduce tasks. In this paper, we use matrix analytic methods to derive stochastic...
Replicating redundant requests has been shown to be an effective mechanism to defend application performance from high capacity variability — the common pitfall in the cloud. While the prior art centers on single-tier systems, it still remains an open question how to design replication strategies for distributed multi-tier systems, where interference from neighboring workloads is entangled with complex...
To improve the latency and bandwidth performance for future high performance computing application, a sub-micron electrical interconnection composed of metal capping layer with sub-micron thickness on typical copper CMP (chemical mechanical polish) BEOL (back-end of line) structure is demonstrated, and the corresponding metal deposition including Ni, Pd, Au using electro-less technique are reported...
Recently, the electronics industry is moved maturely on the mobile/tablet market. The next fast growing opportunity market will be the Internet of Things (IoT) and Wearable Deivces in the near future. This advanced technology/package need to provide the ideal solution for small form factor, thin profile, high electrical performance, multi-function integration and low cost are the most critical requirements...
Two factors are of great importance to the overall performance and efficiency of a fluid distributor: uniform distribution and dead zone volume inside the cavity. From the perspective of improving uniform distribution and reducing dead zones, this research optimized the design of a commonly-used fluid distributor with one side inlet, eight outlets, and a cylinder cavity through numerical simulation...
In order to improve upon a conventional straight microchannel heat sink, a range of curved, angular and wavy microchannels were designed in order to increase fluid mixing via the occurrence of secondary flow interactions, in particular Dean vortices, hence augmenting heat transport. Both numerical models conducted in FLUENT and laboratory experiments were employed to investigate the heat transfer...
In this work, we proposed the new design of two spiral networks interconnected with an expansion chamber to create vortex and disruption of the laminar boundary of intermingled streams which can efficiently boost mass transport in the microchannel. Confocal microscope is used to observe the mixing and fluid motion in the microchannel. We observed the evolution of Dean vortices along the spiral inlet...
Optical fibres have been explored widely for their sensing capability to meet increasing industrial needs, building on their success in telecommunications. This paper provides a review of research activities at City University of London in response to industrial challenges through the development of a range of fibre Bragg grating (FBG)-based sensors for transportation structural monitoring. For marine...
A new type of photodetector with an optical sensor is presented, which enables it to operate even in the presence of strong electro-magnetic interference. The optical sensor head consists of cascaded Fabry-Perot etalons coated with a new type of photo-thermal coating comprising of hydrogel-embedded copper-oxide micro-particles. For white-light irradiation, the photodetector exhibits a power sensitivity...
Defects in optical fibers can cause severe damage, and thus must be found and repaired/replaced early. Such defects in fibers and their coatings can be detected using an angle-resolved interrogator that exploits the contribution of different ray groups. This approach can also estimate the radial position of defects within the fiber. A demonstration is performed with a femtosecond-laser-induced internal...
The anomalous Nernst effect (ANE) and the spin Seebeck effect (SSE) in spin caloritronics are two of the most important mechanisms to manipulate the spin-polarized current and pure spin current by thermal excitation.
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