A simple synthesis of high-quality Cu2O, a material high interest in optics because its photon exciton interconversion properties, the form nanowires (see Figure for TEM image) is reported by authors. Reduction Cu(OH)2, freshly prepared from CuCl2, with hydrazine hydrate basic solution presence surfactant polyethylene glycol (PEG) yields Cu2O 5–8 nm diameter and 10–20 long.

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Ionic polymer--metal composite (IPMC) actuators have promising applications in biomimetic robotics, biomedical devices, and micro/nanomanipulation. In this paper, a physics-based model is developed for IPMC actuators, which amenable to reduction control design. The represented as an infinite-dimensional transfer function relating the bending displacement applied voltage. It obtained by exactly...

A simple synthesis of Mn3O4 nanowires is presented. After thoroughly grinding the precursors together, simply heating product to 850 °C in presence NaCl and surfactant NP-9 produces single-crystal 40–80 nm diameter up 150 μm length (see Figure for a TEM image). From morphology nanowires, Ostwald ripening concluded be main formation mechanism.

Ionic polymer-metal composites (IPMCs) generate large bending motions under a low driving voltage (about 1 V). In this paper quasi-static actuation of IPMC is investigated with the goal precise positioning. It found that exhibits hysteresis between its curvature and applied voltage. The Preisach operator proposed to model hysteresis, density function identified experimentally. An open-loop positioning strategy presented based on efficient inversion operator, efficacy demonstrated by...

In this paper a physics-based model is proposed for biomimetic robotic fish propelled by an ionic polymermetal composite (IPMC) actuator. Inspired biological fins, passive plastic foil attached to the IPMC beam. The incorporates both actuation dynamics and hydrodynamics, captures interactions between actuator foil. Experimental results have shown that able predict steady-state cruising speed of under periodic input. Since majority parameters are expressed in terms fundamental physical...

A novel depth control device has been designed and built. The proof-of-concept utilizes the principles of electrolysis water, enhanced by inclusion an ionic polymer-metal composite (IPMC) membrane as a medium. design incorporates artificial bladder where volume gas generated is controlled solenoid valve, thus changing device's buoyancy. set gold electrodes, separated IPMC film, used lightweight compact generator. acts stable, low power, highly efficient environmentally friendly Experimental...

The accuracy of an a priori geomagnetic reference map is significant constraint on the matching navigation method. Especially when aircraft enters unknown environment, it impossible to accomplish task using traditional methods. Therefore, geomagnetic/INS integrated algorithm for long-scale proposed in this paper, which can perform tasks regardless whether there map. This method combines magnetogram-based with bionic that does not require trajectory first analyzed area where available, and...

A hybrid weighted Fourier transform and relaxation (hybrid-WRELAX) method applied to Loran-C skywave delay estimation is presented. The performance of this demonstrated compared with the spectrum analysis method. hybrid-WRELAX has been proved provide higher accuracy estimate delay. Results testify conclusion using off-air data.

An ionic polymer-metal composite (IPMC) is an electroactive material that bends when electrically stimulated and generates electric current bent. In this paper we investigate a coupled IPMC sensor-actuator using both the sensing actuation properties of these materials. We describe design sensor-actuator, feedback controller experimental evaluation system. Experimental results show feasibility closed-loop control actuator with mechanically sensor.

Ionic polymer-metal composites (IPMCs) form an important category of electroactive polymers (also known as artificial muscles) and have built-in actuation sensing capabilities. A dynamic, physics-based model is presented for IPMC actuators, which amenable to reduction control design. This represented infinite-dimensional transfer function relating the bending displacement applied voltage. It obtained by deriving exact solution governing partial differential equation (PDE) in Laplace domain...

Abstract A new subspace method applied to through‐the‐wall radar for clutter mitigation is presented. The pseudo‐random code continuous wave used and the wall selection algorithm introduced. performance of this demonstrated compared with singular value decomposition‐based methods. Results confirm that suppresses more thoroughly under same conditions.

Through‐the‐wall radar is widely used in civil and military applications. However, the echo from target behind wall often buried reflections other clutter waves. An effective subspace selection method based on singular value decomposition for mitigation presented. Furthermore, Akaike information criterion employed noise mitigation. Experimental results with real data demonstrate correctness effectiveness of proposed algorithm.

After clutters suppression, the feasibility of applying compressive sensing (CS) in through-wall imaging (TWI) using spread spectrum (SS) radar is analyzed. Then CS compared with conventional back projection (BP) method TWI. Results show that it feasible and very effective to use image targets behind wall SS radar. Furthermore, BP imaging, although number observation points has decreased by 67% data store also declined 60%, location accuracy much higher than BP. This will lower cost hardware...

Wall clutter mitigation is important in through-the-wall imaging (TWI) because the target information often buried wall's reflections, especially when located close to wall. A new wall method proposed based on multilevel delay lock loop (M-DLL) technique. The M-DLL structure uses M-sequences' phase sequentially remove direct wave, primary echo and multiple echoes, then rest part of signal used probe estimate position target. can obtain precise correlation signal, has an enhanced...

A time-reversal imaging method, based on frequency-domain data sampling and the estimation of signal parameters via rotational invariance techniques (ESPRIT), is proposed to obtain with higher resolution in this paper. The algorithm obtained, which firstly applies coarse fine frequencies all received scatter signal, thus forming plurality frequency-frequency multistatic matrices (FF-MDM); subsequently, subspace obtained through application singular value decomposition (SVD) FF-MDM; finally,...