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A great deal of scientific research in recent years has focused on alternative neutron detection technologies to the more commonly used 3He proportional counter. One such example is a novel thermal neutron detector developed by Los Alamos National Laboratory consisting of multiple thin film10B layers combined with a double helix electrode configuration. The detector promises low manufacturing costs...
Wireless sensor unit is vital part of the Internet of Things, which is applied for signal acquisition and transmission. Electromagnetic disturbance issue in substation where wireless sensor unit is located is studied, in order to ensure reliability and security of the Internet of Things. Through field measurements, research on characteristics of steady-state electromagnetic disturbance in substations...
This paper presents a spaceborne Synthetic Aperture Radar (SAR) system based on a highly-integrated digital beamforming (DBF) X/Ka-band receiver platform with a dual-polarization capability. Compact modular architecture of the proposed system enables the realization of various configurations of spaceborne SAR missions. This paper describes the proposed radar concept and presents one of the potential...
We demonstrate a graphene/nanotube hybrid phototransistor, in which photogating provided by the nanotube layer leads to a dramatically enhanced photoresponsivity (>100A/W) in the visible range, corresponding to ∼104 enhancement with respect to a graphene-only device.
For the first time we demonstrate an anti-colliding mode-locked laser implemented on a III-V-on-silicon platform. In passive mode-locked operation a 1.7kHz 3dB linewidth of the fundamental RF tone at 4.83GHz is obtained.
In this paper, we analyze the propagation effects of hilly and mountainous terrain on lightning magnetic fields by using a three-dimensional (3-D) finite-difference time domain (FDTD) method. We show that the waveshape, peak value and time delay of the magnetic fields can be significantly affected when propagating along a hilly terrain. It is found in particular that the time delay of the magnetic...
A photodetector based on SWNT-graphene hybrid films and facile fabrication steps is demonstrated, which exhibits a remarkably high photoresponsivity of ∼ 100 A/W, across visible (400 nm) to the telecommunication wavelengths (1550 nm).
A novel polarization reconfigurable antenna based on the transmission line theory is proposed. The antenna contains two side-fed microstrip patches that are placed vertically and horizontally, respectively and fed using a T-shaped branch line. The proposed antenna achieves vertical polarization with the horizontal microstrip patch or horizontal polarization with the vertical microstrip patch, respectively...
The S-NPP VIIRS has operated for more than 3.5 years since its launch in October 2011. The VIIRS reflective solar bands (RSB) calibration is performed by an on-board solar diffuser (SD) and a solar diffuser stability monitor (SDSM). In addition, lunar observations have been used to monitor the RSB on-orbit calibration stability. Since launch, more than 30 lunar calibration events have been scheduled...
Despite the availability of various Process Analytical Technologies (PAT) for measuring other particle properties, their inherit limitations for the measurement of crystal shape have been restricted. This has impacted, in turn, on the development and implementation of optimisation, monitoring and control of crystal shape and size distributions within particle formulation and processing systems In...
Nowadays, water pollution is one of the most important issues on which much attention has been paid. As an effective water treatment method, activated sludge process has been widely used for water purification. However, excess sludge that results from the water treatment still brings pollution to environment. Anaerobic digestion has been used in a broad range of applications in excess sludge stabilization...
We review our work on the heterogeneous integration of III-V laser sources on the silicon photonics platform. These building blocks enable the realization of fully integrated silicon photonic transceivers for optical interconnect applications.
Prof. Richard Moore introduced me to FM-CW radars on my first day at the University of Kansas as a graduate student in 1979 and asked me to put together a radar using laboratory test equipment. I put it together, but it did not provide the results we wanted for detecting buried pipes. This was mainly because of the lack of suitable inexpensive RF and digital technologies at that time. Prof. Moore...
We have investigated superconducting properties of niobium titanium nitride (NbTiN) films to be used for the lower and upper electrodes of a microstrip line with a SiO2 insulator on a quartz substrate at Terahertz frequencies. NbTiN films were prepared on a 1-mm thick quartz substrate directly (assumed to be the lower electrode of the microstrip line) and on an about 150-nm thick SiO2 layer sputtered...
In this paper we show how new materials such as InP epitaxially grown on silicon, graphene and ferroelectric materials with strong electro-optic coefficient can be integrated with silicon waveguides and enhance the functionality of the silicon photonics platform.
With the implementation of the thermal flying height control (TFC) slider, the flying height is reduced to approximately 2 nanometers [1], the gaseous rarefaction effects, surface roughness and surface accommodation effects must be taken into account. The surface accommodation coefficient (AC) is an important factor to govern the flying characteristics of the air bearing slider [2-3]. Effects of gaseous...
Finemet-type nanocrystalline soft magnetic alloys have shown attractive magnetic properties[1-3]. However, due to the relatively low Curie point of the residual amorphous matrix, they cannot be used at high temperature[4-5]. Partial substitution of Co for Fe was carried out to meet the desire for high temperature magnetic properties[6-7]. When Co was added to the FeSiBNbCu alloys, although the Curie...
Bi2Se3 is one of the promising topological insulator (TI) materials, which have both helical spin polarization and strong spin-orbit coupling (SOC). In this work, high quality Bi2Se3 thin films were grown on c-plane sapphire (Al2O3) substrates by molecular beam epitaxy (MBE). The central part of the Bi2Se3 layer was covered with a permalloy (Ni80Fe20) layer by ion-beam sputtering (IBS) with a shadow...
Electrical spin injection into semiconductors is fundamental to realize spintronic devices using the electron spin degree of freedom instead of or in addition to the charge. Datta-Das spin eld-eect transistor is a classical scheme which comprises ferromagnetic spin injector and detector while injected spins in the channel are manipulated by electric field.1 InAs nanowire is a suitable candidate as...
Multiferroic composites with combined ferromagnetic (FM) and ferroelectric (FE) phases have attracted extensive attention due to their strong magnetoelectric (ME) coupling at room temperature [1-4]. Specifically in magnetic-piezoelectric heterostructures, the voltage applied to the piezoelectric layer produces a mechanical deformation that couples to the magnetic layer, and thus induces a change in...
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