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53 attosecond X-ray pulses with photon energies up to 300 eV are generated using polarization gated CEP-stable two-cycle pulses around 1.8 μm and characterized using photoelectron streaking technique combined with the PROOF retrieval method.
Cyber-Physical Systems (CPS) such as Unmanned Aerial Systems (UAS) sense and actuate their environment in pursuit of a mission. The attack surface of these remotely located, sensing and communicating devices is both large, and exposed to adversarial actors, making mission assurance a challenging problem. While best-practice security policies should be followed, they are rarely enough to guarantee...
In this letter, the design of a novel irregular DNA-like left-handed meta-structure is presented. The meta-element consists of four Mirror symmetry helix, between which some intermittent metal rods are introduced. Based on the transmission line theory, an equivalent circuit of the left-handed unit is modeled. And then we design a multi-band antenna by applying the proposed left-handed meta-elements,...
Thermal plastic material polypropylene (PP) has been considered as a promising candidate for recyclable insulation of power cable. However, the stiffness of PP is higher than that of XLPE which makes it difficult to be used directly as cable insulation. In this work, two kinds of elastomers, i.e. polyolefin elastomer (POE) and propylene-based elastomer (PBE), have been added into isotactic polypropylene...
As we known, the measurement of junction-to-case thermal resistance (Rth-JC) of semiconductor power devices is very important. In this paper, an approach of transient dual interface method (TDIM) with gate-source voltage (Vgs) as the temperature sensitive electrical parameters (TSEP) was investigated for the measurement of Rth-JC of packaged SiC MOSFET. The measured Rth-JC value of packaged SiC MOSFET...
New hybrid bulk-surface acoustic wave resonators using scandium doped aluminium nitride thin films were simulated, using material constants from piezoelectric measurement techniques for thin films. Afterwards they were fabricated and an electromechanical coupling of 4.3% was achieved.
Based on the Microshutter Array (MSA) subsystems developed at NASA Goddard Space Flight Center (GSFC) for the James Webb Space Telescope (JWST), Next Generation Microshutter Array (NGMSA) has been developed to be used as multi-object selectors for future telescopes in space applications. Microshutter arrays function as transmission devices. Selected shutters fully open 90 degrees permitting incoming...
We present an overview of a set of radar instruments developed at the University of Kansas for multi-spectral measurements of ice and snow properties. The systems operate at different frequency bands ranging from 14 MHz to 38 GHz, onboard manned and unmanned aircraft. The data collected with these systems are used to estimate parameters such as ice thickness, ice surface and bedrock topography, snow...
For beyond 7 nm node BEOL, line resistance (R) is assessed among four metallization schemes: Ru; Co; Cu with TaN/Ru barrier, and Cu with through-cobalt self-forming barrier (tCoSFB) [1]. Line-R vs. linewidth of Cu fine wires with TaN/Ru barrier crosses over with barrier-less Ru and Co wires for beyond-7 nm node dimensions, whereas Cu with tCoSFB remains competitive, with the lowest line R for 7 nm...
This paper analyzes the influence of the electrical coupling among interconnection lines in MEMS gyroscopes and proposes strategies during designing structure to eliminate its effect. Moreover, a compensation circuit is designed to further suppress coupling signal at the readout. The results of bias drift tests under full temperature range indicate that not only the bias drift in the vacuum is much...
This paper reports our newly developed microfluidic print-to-screen (MPS) platform and its application for synthesizing combinatorial peptide on PEG microdisc array. The MPS platform possesses several distinct features including easy operation, free of contamination, multiplexibility, low cost, high throughput and array density. The performance of the MPS system is characterized and, as proof of concept,...
A validation study was conducted to study the performance on detection of underground void underneath pedestrian walkway by the use of ground penetrating radar (GPR). The experiment was carried out on a footpath which locates adjacent to the lateral support of a deep excavation works. 3 number of GPR scans were carried out, 7 nos. and 5 nos. of suspected voids and water leakage points from drain were...
In this paper, for the first time we demonstrate that horizontally stacked gate-all-around (GAA) Nanosheet structure is a good candidate for the replacement of FinFET at the 5nm technology node and beyond. It offers increased Weff per active footprint and better performance compared to FinFET, and with a less complex patterning strategy, leveraging EUV lithography. Good electrostatics are reported...
A novel MEMS inertial switch with electrostatic force assistance and multi-step pull-in behavior has been designed, which can help the electrodes weaken the bounce and keep a long contact in the inertial switch before the leakage of electricity ends compared with the traditional rigid contact between electrodes. The dynamic switching and pull-in performance is simulated by finite element method. The...
This paper proposes a robust H∞ controller based on Multi-objective genetic algorithms (MOGAs) to control the active magnetic bearings (AMBs) with application to superfluid helium cryogenic centrifugal compressor (CCC). Basic weighting function formulas with seven parameters in all are suggested for H∞ controller, whose physical connections with system performance are clearly explained. Weighting...
A simple quasi-optical design for LO coupling in the quasi-optical heterodyne system has been described. Due to the limited LO power available at THz bands, it is of great importance to achieve high efficiency LO power coupling to the mixer. Two elliptical mirror have been employed to couple the LO power to the SIS mixer. Measurement at nearly 500GHz shows such configuration is sufficient to pump...
Co/Cu composite interconnect systems were studied. Since wide Cu lines require a diffusion barrier which is simultaneously applied also to fine Co lines to reduce Co volume fraction, through-Cobalt Self-Formed-Barrier (tCoSFB) was employed to thin down TaN barrier to <1 nm which works as an adhesion layer for Co lines. Line R of fine Co lines was reduced by 30% successfully. The Co/tCoSFB-Cu composite...
Health-conscious battery management is one of the main facilitators for widespread commercialization of Li-ion batteries as the primary power source in electrified transportation and portable electronics and as the backup source in stationary energy storage systems. The majority of the existing Battery Management Systems (BMSs) define battery State of Health (SOH) in terms of internal resistance increase...
In this paper, we propose techniques to design and fabricate polymer micro-cantilevers for attachment onto the end of standard single mode fibers using laser machining. The polymer cantilever is fabricated by laser micro-machining a sheet of polymer into the required shape and then bonded onto the top of a ceramic ferrule by photo resist as a flat supporting and bonding layer. The dimension of resulting...
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