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A reconfigurable optical inter-channel interference compensation method without channel spacing estimation and relative time delay calibration is proposed for a high density multi-carrier transmission system. Experiments demonstrate the effectiveness for both 20/25-Gbaud dual-carrier QPSK systems with different channel spacing conditions.
We combine array-signal-processing and spectral domain techniques to determine the optimal aperture current distribution that maximizes the power coupling between two antenna apertures which are located on opposing sides of a multilayered lossy structure in the near-field. The resulting optimal distribution can be used as a reference in the design of antennas for near-field applications, such as for...
We report a half-octave-spanning Kerr frequency comb which has the record-low phase noise floor with −130 dBc/Hz at 1 MHz offset for 18 GHz carrier frequency, and long-term Allan deviation of 7×10−11/τ0.84 with active stabilization.
Generation of femtosecond electron bunches has been investigated for a light source based on electron bunches and improvement of time resolution in time-resolved measurements. In this study, temporal electric fields from electron bunches using a photoconductive antenna (PCA) with radial microstructures were measured. Radially polarized terahertz (THz) pulses from femtosecond electron bunches were...
Autonomous control of Flapping Wing Vehicles (FWVs) through sophisticated software units is challenging due to its inherent complex motion characteristics. This article emphasize on the development of graphical user interface (GUI) for the control of FWVs to achieve superior maneuverability. A vision based computer control interface is developed for manual as well as autonomous performance of FWVs...
The thermo-optical effects in the diode-end-pumped lasers with Yb:KGW anisotropic crystals is experimentally investigated. Strong dependence of optical power and aberrations of the lenses on orientation of laser crystals concerning a direction of laser radiation propagation and a polarization direction is confirmed. By optimizing the crystal configuration we obtained a high-power output laser beams...
In this paper, a family of discrete-time system models of an Electric Variable Valve Timing (EVVT) actuator for internal combustion engines under different operational conditions were obtained through the closed-loop system identification, where the complicated EVVT actuating system was treated as a black box. Since it is almost impossible to hold the EVVT cam phasing system at the desired operational...
A new photonic microwave phase shifter that can realize the continuous 0°–360° phase shift with high output RF signal power is presented. It is based on controlling the phase of the two RF modulation sidebands of the phase modulated optical signals. The use of the two RF modulation sidebands, instead of the single sideband in most conventional phase shifters, has the advantage of high output RF signal...
An affinity based method of glucose measurement using a fiber optic surface plasmon resonance (FO-SPR) sensor with surface modification by a borate polymer was proposed. The proposed sensor is able to obtain the glucose concentration by detecting the surface refractive index of the sensor, which could avoid the impact of bioelectricity from viable tissues when applied for implantable measurement....
Samples prepared for S EM imaging after Focused Ion Beam (FIB) milling often require staining or delineation on the cross section to distinguish the different layers/features of the device structure. Wet staining using Buffered Oxide Etch (BOE), is one of the most common and economical decoration methods. Since we tetching is difficult to control, artifacts such as copper void and film over-etch may...
A sample preparation methodology was developed for Four-Point Bending test (4PB) of Cu/Nblk (Nitrogen-doped Barrier for Low-k, SiCN) bi-material in order to overcome interfacial delamination zero yielding issue, possibly caused by the change in carbon content of Nblk film. The methodology involving (i) chemical de-processing (HNO3:BOE mixture) and (ii) film thickness optimization was instrumental...
This paper describes a novel micro electrical impedance spectroscopy (μEIS) device with cell traps, which can discriminate between normal and cancerous human urothelial cells. Three-dimensional traps with electrodes were employed for effective capture of target cells. This allows cells to be automatically captured, while the electrodes on the slanted area of the trap accurately characterize the electrical...
We report a novel Self-Locking Optoelectronic Tweezers (SLOT) for single-cell manipulation in cell culture media across a large area. SLOT overcomes two major technical barriers of conventional optoelectronic tweezers (OET) toward high throughput single-cell manipulation. Its unique lateral, ring-shaped phototransistor design enables manipulation in high conductivity media (1 S/m) and overcomes a...
Metamagnetism, a sudden increase in the magnetization of a material with a small change of external magnetic field, are calling more attentions because of their rich magnetic phenomena and scientific significance [1][2]. There are quite different physical causes for different types of metamag-nets. In this work, metamagnetism has been found in arc-melting Sm(Ni0.5Fe0.4Cu0.1)7. The physical property...
Strongly correlated electron systems, especially the perovskite oxides with the general formula ABO3, have been studied for some decades due to their intriguing properties such as magnetism, mutiferroicity, ferroelectricity, colossal magnetoresistence and superconductivity [1]. In light of the previous studies of ABO3, A-site and B-site doping in these systems can lead to different crystal structures,...
Developing Dy-free Nd-Fe-B sintered magnets with high coercive force is a current research hot topic of rare earth permanent materials. Refining the Nd2Fe14B grains is an effective way to enhance the coercivity[1]. A coercivity as high as 19 kOe has been reported in Dy-free sintered Nd-Fe-B magnets when the grain size is reduced to about 1 μm[2]. It has been shown that the coercivity of sintered Nd-Fe-B...
Since Mn atoms in the system of Mn-based materials can have large magnetic anisotropy and high magnetic moments (almost twice as high as Fe atoms in pure Fe metal), ternary or quaternary Mn-based compounds show potential as hard magnetic materials with high performance and medium price[1-3]. However, the knowledge of the magnetic moment formation and the mechanism of the magnetic coupling between...
In 1990, the discovery of interstitial nitrogen atom effect on rare earth-iron intermetallics attracted much interest in the field of magnetism and magnetic materials. The nitrogenation effect is typically demonstrated in 2:17 and 1:12 rare earth — iron compounds. After nitrogenation, the intrinsic magnetic properties of the 2:17 and 1:12 nitrides are marvelously improved. So their intrinsic magnetic...
Exchange bias (EB) effect has been intensively studied for more than half century due to its applications in spintronics devices, such as giant magneto resistance (GMR) read heads and magnetic random access memory (MRAM).[1] Except for conventional ferromagnetic (FM)-antiferromag-netic (AFM) system, EB has also been reported in other magnetic systems, such as ferromagnetic (FM)-ferromagnetic (FIM)...
There is growing interest in energy scavenging from natural vibration sources to power autonomous wireless telemetry devices. Vibration energy is typically converted into electrical energy using piezoelectric, electromagnetic, or electrostatic transduction mechanisms [1]. Despite the transduction mechanisms and novel structures, there is still an obstacle facing realistic implementation in most of...
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