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Due to the high variability in tumor morphology and the low signal-to-noise ratio inherent to mammography, manual classification of mammogram yields a significant number of patients being called back, and subsequent large number of biopsies performed to reduce the risk of missing cancer. The convolutional neural network (CNN) is a popular deep-learning construct used in image classification. This...
We present the first antenna power measurements from a double metal terahertz-frequency quantum cascade laser (THz QCL) mounted within a waveguide cavity and incorporating dual diagonal feedhorns that enable directional output coupling of THz radiation from both laser facets. The feedhorn antenna patterns have been measured simultaneously at a frequency of 3.5 THz and with the QCL operating at an...
We demonstrate a flexibly controllable molding of electromagnetic waves by designing magnetic metamaterials and metasrufaces with an array of ferrite rods under a particularly arranged bias magnetic field. The manipulation is accomplished for both the spatially propagating waves and the surface waves confined at the interface. Nonreciprocal properties associated with the magnetic surface plasmon resonance...
A novel suspended GeSn microstructure is demonstrated by selective etching of GeSn thin film on Ge. XRD and μ-Raman measurements show that the compressive strain in the GeSn thin film is effectively relaxed, and furthermore, unexpected tensile strain was introduced in the suspended GeSn.
We present our recent researches on novel group IV nano- and micro-structures for potential light sources on Si, including the tensile strained Ge quantum dots (QDs), GeSn thin films and microstructures, and Ge(Sn) nanowires. Tensile-strained Ge QDs were grown by SS-MBE, and photoluminescence was achieved. The GeSn thin films were demonstrated with Sn concentration above the bandgap transition critical...
TSV-Free Interposer (TFI) technology eliminates TSV fabrication and reduces manufacturing and material cost. Co-design modelling methodology is established for TFI technology with considering wafer process, package assembly and package/board level reliability and thermal performance to optimize structure design, wafer process, assembly process and material selection. Experimental results are used...
The LOCUS atmospheric sounder is a satellite-borne THz radiometer concept, for studying molecular species in the mesosphere and lower thermosphere. We report waveguide-integrated THz quantum-cascade lasers for use as 3.5 THz local oscillators. A waveguide-integration scheme, using an integrated diagonal feedhorn significantly improves power outcoupling. 1.3 mW THz emission is demonstrated in a space-qualified...
Miniaturized hexapod MEMS microrobots with two kinds of actuators were described in this paper. The actuator of MEMS microrobots had two types which were shape memory alloy (SMA) actuator and piezoelectric (PZT) actuator. For PZT type microrobot, a piezoelectric element was affixed outside the rotor. The piezoelectric element would be expanded by electrical pulses and impacted on the rotor to generate...
This paper suggests the MEMS air turbine that used for the MEMS electromagnetic induction type generator. In the MEMS air turbine that employed the fluid dynamic bearing system, the gap between the magnet and the magnetic circuit and the eccentric motion of the rotor are problem in the high efficiency and the high output power. The developed MEMS air turbine has miniature silicon structure and the...
This paper proposes an electromagnetic induction type MEMS (Micro Electro Mechanical Systems) motor. The developed MEMS motor is combined the MEMS process and the multilayer ceramic technology. The MEMS process forms the silicon miniature components for a structural part. The multilayer ceramic technology fabricates a miniature ceramic magnetic circuit. This technology is possible to realize a miniature...
For the first time, 20nm DRAM has been developed and fabricated successfully without extreme ultraviolet (EUV) lithography using the honeycomb structure (HCS) and the air-spacer technology. The cell capacitance (Cs) can be increased by 21% at the same cell size using a novel low-cost HCS technology with one argon fluoride immersion (ArF-i) lithography layer. The parasitic bit-line (BL) capacitance...
We investigate both theoretically and experimentally a new type of laser, which exploits a broadband light “condensation” process sustained by the stimulated amplification of an optical blackbody metamaterial.
Low density parity check (LDPC) codes with iterative soft decoding have been adopted as the primary error correction coding technology in data storage devices, e.g., hard disk drives (HDDs) and solid state drives (SSDs). Data storage normally has stringent requirements for low probability of decoding failure since there is no re-transmission mechanism as available for most other data communication...
Finemet alloys exhibit superior soft magnetic properties with high initial permeability (μ), low coercivity and low core loss, which attracted a great deal of attention [1]. However, their application is limited to the temperature close to the Curie point of an amorphous matrix, Tcam, because the intergranular magnetic coupling is usually interrupted by the paramagnetic amorphous matrix. As the result,...
The multiple non-linear interaction theory model of high-frequency (HF) electromagnetic wave and Schumann Resonance (SR) is constructed on the basis of ionosphere cross modulation. The global SR distribution, particularly the phase variation effect on the modulation depth of HF waves and SR, is investigated. Results show that modulation depth is not proportional to the interaction distance under the...
Schumann Resonance is seriously disturbed by the industrial environment noise. The SNR of Schumann resonance spectral peaks obtained is very low. The effect of singular value decomposition filtering on Schumann resonance data processing is studied in this paper. The relationship between the number of singular value and SNR is analyzed. And the algorithm of interference suppression ability is also...
With rapid development of pulse power technology, two-electrode gas spark switch has broadened its application in industrial fields, such as the extraction of unconventional gas resources. Thus, the repetitive switch requests high current capability, low breakdown voltage dispersancy, and long lifetime in an airtight chamber without gas blowing system or electrode cooling system. The purpose of this...
The two-electrode switches are the simplest and most commonly used closing switches in pulse power systems. Some researchers have designed a series of two electrodes spark-gap switches with many methods to promote insulation recovery for a stable self-breakdown voltage (Ub). But few studies have done on high-power repetitive spark-gap switches under adverse conditions, which means the switch works...
Underwater pulse discharge will lead strong shock waves, which has been widely used in extracorporeal shock wave lithotripsy, material and surface performance modification, manufacturing, mineral prospecting and oil production improvement. Many methods have been taken to generate strong shock waves, and the underwater discharge way is convenient and cost-effective in industrial applications. Many...
Switch is one of the key components in the pulsed power system. The two-electrode spark-gap switch made of alloy Cu-W has many advantages such as high current capability, long lifetime, and stability. Many researches have established a series of models of electrode erosion for failure prediction. Few of them considered adverse conditions, which means the switch works in a small airtight cavity without...
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