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In recent years, the use of autonomous undersea vehicles (AUVs) for highly time-critical at-sea operations involving surface ships has received increased attention, magnifying the importance of optimal interception. Finding the optimal route to a moving target is a challenging procedure. In this work, we describe and apply our exact time-optimal path planning methodology and the corresponding software...
We report a laser-ablation aided, direct-write fabrication technique that could convert non-conductive paper rinsed with metal ions and polymer solution into conductive metal carbide and graphene with a typical sheet resistance of 45.3 Ω/□. As fabricated paper electronics inherit the microfiber network from paper and have nanoscale pores and 2D metal carbide flakes due to the laser ablation process...
A highly sensitive fiber-optic Fabry-Perot interferometric geophone (FFPG) with graphene coated PMMA membrane is proposed and demonstrated, where the graphene coating is used for enhancement of the mechanical strength of the membrane. It is found that the sensitivity of the FFPG is much higher than that of the conventional electrical geophone. Such a novel all-optical geophone with low cost, high...
Theoretical calculations for L10-MnGa compound indicate a high anisotropy constant, Ku (26 Mergs/cm3) and a saturation magnetization, Ms (116 emu/g), which predict a maximum energy product, (BH)max, of 28 MGOe.
This paper describes the design, fabrication, and testing of an on-wafer substrate that has been developed specifically for measuring extreme impedance devices using an on-wafer probe station. Such devices include carbon nano-tubes (CNTs) and structures based on graphene which possess impedances in the κ Ω range and are generally realised on the nano-scale rather than the micro-scale that is used...
InP DHBTs are receiving a great deal of attention for its potential in the yet, undefined, 5G systems. In this paper, "waterfall" curves are evaluated for InP DHBTs at 900MHz and show that it can provide an improvement in PAE at low voltages (10% better than GaAs or SiGe HBTs). RF Knee MAG/MSG metrics at 5.4GHz and 15.4 GHz as compared to GaAs HBTs were also measured. These measurements...
Short-range wireless terahertz (THz) communication and ultrafast THz interconnects require switches and modulators. Here, we experimentally show voltage-bias superconducting (SC) niobium nitride (NbN) metamaterial to realize a switch. The obtained maximum transmission coefficient at 0.507 THz is up to 0.98 and it drops to 0.19 when the applied voltage is only increased to 0.9 V. A relative transmittance...
Frequency measurement based on dual THz frequency combs of photocarrier (dual PC-THz combs) is a promising method for the real-time measurement of the absolute frequency in CW-THz radiation without the need for cryogenic cooling. However, use of dual femtosecond lasers hinders the practicability of this method. In this paper, we generated dual PC-THz combs using a free-running, dual-wavelength mode-locked...
2.5D silicon interposer, for a cost effective optoelectronic package, is proposed and fabricated on a wafer level. Using this packaging approach, the fully assembled 120 Gb/s transmitter is scaled down to 6mm × 7mm.
In this work, thermal and flow characteristics for the metallic foam heat sinks (FHSs) with the central impingement flow were studied with de-ionized water coolant. Such a flow configuration helps to reduce the pressure drop inherent for straight flow in porous foams. The reduction in the pressure drop is analyzed based on the one-dimensional porous medium model and verified with experimental measurement...
A load transferring strategy for High-voltage distribution network (HVDN) is presented in this paper to mitigate operation congestion in urban power system. A novel bi-level programming model based on topological units (group) is established in this paper instead of traditional intelligent algorithm with 0–1 integer variables. In the upper level, the balance factor is defined to guide the reasonable...
We develop a robust, unsupervised vehicle tracking system for videos of very congested road intersections in urban environments. Raw tracklets from the standard Kanade-Lucas-Tomasi tracking algorithm are treated as sample points and grouped to form different vehicle candidates. Each tracklet is described by multiple features including position, velocity, and a foreground score derived from robust...
We demonstrate a Silicon Photonics transmitter/receiver pair wire bonded to chip-scale electronics and operated with a single section semiconductor mode locked laser. The compact WDM system supports twelve independent error free (BER<1e-12) 14 Gbps channels without error correction, preemphasis or equalization.
Failure Analysis (FA) consists of fault verification, isolation, defect tracing, characterization and physical analysis. Flash memory is widely used in data storage. High density cell array makes flash memory prone to defects. In this paper, a NOR flash page failure case was studied. The failed page, consisting of 8 word lines and 512 bytes, cannot be erased. Light emission could help isolate the...
A new Joule balance is being set up at the National Institute of Metrology China (NIM) for realization of mass redefinition through the Planck constant. The relative uncertainty goal of the numerical value of the Planck constant required for the redefinition of kilogram should not exceed 2.0×10−8. To reach this goal using experiments based on the Joule balance, the precision gravity value at the centre...
The Joule balance method is one of the several approaches to measure the Planck constant for the redefinition kilogram. The first prototype has been built to check the feasibility of the principle and the relative uncertainty is 2.6×10−6. To get better result and make contribution for the redefinition, since 2013, a new Joule balance has been designed with several new approaches to decrease the main...
During the smooth running of EAST (Experimental Advanced Superconducting Tokamak), a perfect network management system guaranteeing a robust network is important. In the present complex network infrastructure, it is a daunting task to manage all the devices manually in a network and make sure they are not only up and running but also performing optimally. Therefore, a web-based software system is...
Oxygen vacancies are widely thought to be responsible for resistive switching (RS) effects based on polycrystalline oxides films. It is also well known that grain boundaries (GB) serve as reservoirs for accumulating oxygen vacancies. Here, Ar gas was introduced to enlarge the size of GB and increase the quantity of oxygen vacancies when the Ba0.6Sr0.4TiO3 (BST) films were deposited by pulse laser...
Automatic discomfort detection for infants is important in health care, since infants have no ability to express their discomfort. In this paper, we propose an automatic system for detecting and monitoring discomfort of infants based on video analysis. The system is based on supervised learning and classifies previously unseen infants from the testing set in a fully automated way. Our system consists...
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