Electronics

Electrochemical functionalization of graphene nanosheets with catechol derivatives as an effective method for preparation of highly performance supercapacitors
Performance enhancement of supercapacitors has been recently discussed. In this paper a novel and facile procedure for functionalization of graphene with some electroactive molecules is presented. The graphene has been functionalized by catechol-based molecules, which are electroactive molecules with electrochemically reversible properties. The functionalized graphene exhibits very effective ps...


A molecular molybdenum–schiff base electro-catalyst for generating hydrogen from acetic acid or water
The reaction of 2-pyridylamino-N,N-bis(2-methylene-4-ethyl-6-tert-butylphenol) (H2L) and MoCl5 gives a molybdenum(VI) complex [MoL(O)2] 1, a new molecular electrocatalyst, which has been determined by X-ray crystallography. Electrochemical studies show that complex 1 can catalyze hydrogen evolution from acetic acid or aqueous buffer. Turnover frequency (TOF) reaches a maximum of 68 (in N,N-Dime...
Probing the pH dependent electrochemistry of a novel quinoxaline carboxylic acid derivative at a glassy carbon electrode
The redox behavior of a novel quinoxaline carboxylic acid derivative, 6-(1-hydroxynaphthalen-2-yl) benzo[f]quinoxaline-2-carboxylic acid (HBQCA) was studied at the surface of glassy carbon electrode in a wide pH range using modern electrochemical techniques. Cyclic, square wave and differential pulse voltammetry were employed in this work. Several important thermodynamic parameters of the redox...


Electrochemical behaviors of Dy(III) and its co-reduction with Al(III) in molten LiCl-KCl salts
In this work, the electrochemical behaviors of Dy(III) and its co-reduction with Al(III) on an inert tungsten electrode was investigated in LiCl-KCl molten salts at the temperature of 773K by using cyclic voltammetry (CV), chronopotentiometry (CP) and square wave voltammetry (SWV) techniques. The results showed that the reduction of Dy(III) ions in LiCl-KCl salts is a reversible diffusion contr...
Model-Free Control of a Hovering Flapping-Wing Microrobot
We present a model-free experimental method to find a control strategy for achieving stable flight of a dual-actuator biologically inspired flapping-wing flying microrobot during hovering. The main idea proposed in this work is the sequential tuning of parameters for an increasingly more complex strategy in order to sequentially accomplish more complex tasks: upright stable flight, straight ver...


A chopper current feedback instrument amplifier with bandpass amplification stage
A novel chopper indirect current feedback instrument amplifier (IA) is presented in this paper. Normally, low frequency signal is choppered to high frequency and then fed into an IA’s first amplification stage with low pass frequency response. While the signal is amplified, the offset and 1/f noise of the first stage are also enlarged. This leads to large ripple at IA’s final output. A band...
Over-voltage stressed dual-resonance injection-locked frequency divider with series-peaking injection device
Over-voltage RF stress was applied to an LC dual-resonance injection-locked frequency divider (ILFD) to study the post-stress ILFD RF performance. The LC ILFD was implemented in the TSMC 0.18 μm 1P6M CMOS process and it was stressed at the supply voltage of 2.3 V for 5 h. The dual-resonance ILFD has dual-band locking ranges and it uses series-peaking injection MOSFET. The over-voltage RF st...

Parallel Ring-Line Rat-Race Circuit with Very Loose Coupling Utilizing Composite Right-/Left-Handed Transmission Lines
In this paper, we consider a parallel ring-line rat-race circuit realized by replacing some parts of the ring-lines with composite right-/left-handed transmission lines (CRLH-TLs). For a conventional rat-race circuit, the minimum coupling factor is limited by the highest impedance of the ring-lines that can be manufactured by general printed circuit board (PCB) technologies. However, the coupli...
A Compact Three-Mode H-Shaped Resonator Bandpass Filter Having High Passband Selectivity with Four Transmission Zeros and Wide Stopband Characteristic
This paper proposes a compact three-mode H-shaped resonator bandpass filter fed by antiparallel coupled input/output lines. To investigate the resonant behavior of the H-shaped resonator, even/odd-mode resonance conditions of the resonator are first derived analytically. The multimode resonances of the H-shaped resonator filter are modeled by a multipath circuit formed with resonance paths. Mor...

Realization of a Planar Dual-Band Fork Three-Way Power Divider Using an Impedance Scale Factor
Realization of a planar dual-band fork three-way power divider (PDBF3PD) with Cheng's equivalent structure is discussed. The Cheng's structure consists of two open-circuited stubs and a transmission line, and the characteristic impedances tend to be high. As a result, the realizable range of frequency ratios of upper frequency to lower frequency is limited in a narrow area. In this paper, an im...
A Simple Through-Hole Based Transformer between Microstrip Line and Post-Wall Waveguide for Millimeter-Wave Applications
We proposed a through-hole based transformer between microstrip line and post-wall waveguide (PWW). The transformer is based on a through-hole which is electrically separated from top and bottom broad walls of a waveguide by ring-shaped spaces. The proposed transformer shows a considerable merit compared with a conventional one based on blind-via in terms of fabrication and cost because it can ...

A Simplified Broadband Output Matching Technique for CMOS stacked Power Amplifiers
This paper describes the design method of a broadband CMOS stacked power amplifier using harmonic control over wide bandwidths in a 0.11,$mu $m standard CMOS process. The high-efficiency can be obtained over wide bandwidths by designing a load impedance circuit as purely reactive as possible to the harmonics with broadband fundamental matching, which is based on continuous Class-F mode of opera...
Experimental Investigation on RF Characteristics of Cryogenically-Cooled 3W-Class Receiver Amplifier Employing GaN HEMT with Blue Light LED for Mobile Base Stations
This paper presents an experimental investigation on the RF characteristics of a 3W-class cryogenically-cooled receiver amplifier employing a gallium-nitride high electron mobility transistor (GaN HEMT) with a blue light for mobile base stations. In general, a cryogenically-cooled receiver amplifier using a GaN HEMT exhibits unstable DC characteristics similar to those found in the current coll...
Millimeter-Wave GaN HEMT for Power Amplifier Applications
Gallium nitride high electron mobility transistors (GaN HEMTs) were developed for millimeter-wave high power amplifier applications. The device with a gate length of 80 nm and an InAlN barrier layer exhibited high drain current of more than 1.2 A/mm and high breakdown voltage of 73,V. A cut-off frequency $ extrm{f}_{ extrm{T}}$ of 113,GHz and maximum oscillation frequency $ extrm{f}_{ extrm{max...
A Dynamic Hyper-Heuristic Based on Scatter Search for the Aircraft Landing Scheduling Problem
Aircraft Landing Scheduling (ALS) attempts to determine the landing time for each aircraft. The objective of ALS is to minimise the deviations of the landing time of each aircraft from its target landing time. In this paper, we propose a dynamic hyper-heuristic algorithm for the ALS problem. In our approach, the Scatter Search algorithm is chosen as the high level heuristic to build a chain of ...