Abstract Nanostructured V 2 O 5 thin films have been prepared by means of cathodic deposition from an aqueous solution made and H directly on fluorine‐doped tin oxide coated (FTO) glasses followed annealing at 500°C in air, studied as film electrodes for lithium ion batteries. XPS results show that the as‐deposited contained 15% 4+ , however after all vanadium is oxidized to 5+ . The crystallinity, surface morphology, microstructures investigated XRD, SEM, AFM. excellent electrochemical...

The authors present a method for estimating the parameters of 2-D damped harmonic (modal) signals in additive Gaussian noise. This applies cases single or multiexperiment data and incoherent coherent signals. Both synthesis analysis models are developed. Central to these signal orthogonal subspaces. Under assumption distinct modes one two dimensions, there exists an invertible function between can be used express optimization problem given by maximum likelihood terms subspace. resulting...

Gas-to-RTIL (room-temperature ionic liquid) partition coefficients have been compiled for 592 different solute-RTIL combinations. These were converted into water-to-RTIL using the corresponding gas-to-water coefficients. Both sets of analyzed Abraham solvation parameter model with cation-specific and anion-specific equation The derived equations correlated experimental gas-to-RTIL coefficient data to within 0.10 0.14 log units, respectively. 8 calculated 4 can be combined yield expressions...

Abstract Zinc‐air batteries (ZABs) using gel polymer electrolytes suffer from low energy efficiency and poor cyclability. This issue is not only associated with the air electrode, as early failure of battery often due to Zn electrode. Here, cycle life ZABs alkaline poly(acrylic acid) (PAA‐KOH) electrolyte shown vary by changing its crosslinking density. For hydrogel electrolytes, understanding mechanism optimization composition are key achieving better utilization electrode rechargeability....

Abstract. We present a nonparametric approach based on local polynomial regression for ensemble forecast of time series. The state space is first reconstructed by embedding the univariate series response variable in dimension (D) with delay (τ). To obtain from given point t, three steps are involved: (i) current system mapped to space, known as feature vector, (ii) small number (K=α*n, α=fraction (0,1] data, n=data length) neighbors (and their future evolution) vector identified and (iii)...

Abstract (Co,Fe) 3 O 4 nanoparticles are decorated onto N‐doped carbon nanotubes at room temperature through a simple mixing process and simultaneously deposited within porous gas diffusion layer (GDL) by an impregnation technique. The identified as the spinel phase transmission electron microscopy (TEM) X‐ray photoelectron spectroscopy (XPS) analysis. composite GDL is used air electrode for Zn‐air batteries shows excellent performance bifunctional catalyst with initial discharge charge...

Abstract Mn 3 O 4 ‐decorated N‐CNTs are synthesized and impregnated into porous carbon paper (gas diffusion layer or GDL) to form a composite catalyst‐GDL material in simple novel one‐pot process. The electrode features high active surface area, improved discharge performance, reduced vulnerability flooding when compared with other preparation techniques for similar catalysts. Electrochemical battery testing show catalytic activity maximum potential superior CNT supported catalysts,...

Various transition metal-based bimetallic and trimetallic oxides on N-CNTs were successfully synthesized in a one-pot process. Porous gas diffusion layers (GDLs) simultaneously impregnated with the catalysts during synthesis, resulting an efficient scalable preparation technique for nano-composite air electrodes. NiMnOx/N-CNT, NiFeOx/N-CNT, (Co,Fe)3O4/N-CNT highest performing based battery rate test results. Therefore, Ni-Co-Fe, Ni-Mn-Fe, Mn-Co-Fe systems investigated as combined oxide/N-CNT...

The nucleation and growth of electrodeposited Mn oxide rods has been investigated by preparing deposits on Au coated Si at varying deposition times between 0.5 s 10 min. were using high resolution scanning transmission electron microscopy. A model for the proposed. Nucleation begins as thin sheets along grain boundaries triple points. As these sites are consumed, spreads across grains. in close proximity causes agglomeration formation rounded particles. Some particles then accelerate growth,...

Oxygen reduction electrodes for zinc–air batteries (ZAB) have been prepared by depositing conformal films of MnOx directly onto high surface area gas diffusion layers (GDL) via atomic layer deposition (ALD). were means two conditions: one using a forming (95% N2, 5% H2) plasma (FG-MnOx) and an O2 (O2-MnOx). A composite electrode FG-MnOx + CoOx was also examined. The nature ALD allowed to be deposited within the porosity GDL, as confirmed X-ray microanalysis. Full cell ZAB tests showed...

MnOx deposits on porous gas diffusion layer (GDL) substrates for application as catalysts the oxygen reduction reaction (ORR) in metal–air batteries have been prepared using atomic deposition (ALD). The saturation behavior of bis(ethylcyclopentiadienyl) manganese ((EtCp)2Mn) and H2O ALD system has investigated. observed is disagreement with previous reports literature. (EtCp)2Mn + depositions exhibited non-ALD behavior, demonstrated by a high growth per cycle (GPC) at substrate temperatures...

Abstract Zinc‐air batteries (ZABs) are one of many energy storage technologies that can help integrate renewable into the power grid. A key developmental goal for ZABs is replacing precious metal catalysts at air electrode with more abundant and inexpensive materials. In this work, a MnFe x O y bifunctional catalyst directly deposited on ZAB using atomic layer deposition (ALD). With ALD, composition coating be finely tuned based catalytic activity. Characterization through electron...

The authors study the computational complexity of two methods for solving least squares and maximum likelihood modal analysis problems. In particular, they consider Steiglitz-McBride iterative quadratic (IQML) algorithms. J.H. McClellan D. Lee (ibid., vol.39, no.2, p.509-12, 1991) have shown iterations to be equivalent. However, suggest that algorithm may computationally preferable. A method reducing dimension matrix inversion required at each iteration IQML is provided. resulting reduction...

This paper presents a metric useful in analyzing the resolution of multidimensional (vector) parameter estimators that produce normal estimates. is based on distance between ellipsoidal confidence regions about each parameters. When ellipsoids are disjoint parameters deemed resolvable. method for finding noise level at which all disjoint, but least two tangent. threshold level. The underlying mathematical result treats problem dilation (noise level) coupled quadratic equations have unique solution.

The authors use the data collected by a linear, multisensor array to identify wavenumber, damping factor, frequency and amplitude of individual point sources in far field. algorithm is based on principle maximum likelihood. solution this optimization problem yields likelihood estimates spatial-temporal parameters for each source field environment. was obtained characterizing orthogonal subspace space-time an sensors. This constructed such way that it possible pair temporal spatial mode...

The purpose of the paper is to develop and explore Cramer-Rao (CR) bounds for two-dimensional modal analysis problem. model employed deterministic involves a single snapshot data. bounded parameters include noise variance, moduli phases signal amplitudes, 2D modes (poles). asymptotic behavior in special case undamped explored. Finally, are shown be less than or equal those multitrial 1D model.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

A template free anodic electrodeposition process has been developed to deposit Mn oxide and oxide/ PEDOT rods onto Ni foam substrates for use as a supercapacitor. The morphology optimized by varying deposition conditions characterization using SEM imaging. TEM diffraction indicates that the deposits are poorly crystalline, with grain size less than 20 nm. XPS analysis revealed present combination of MnO 2 MnOOH. capacitive performance was characterized cyclic voltammetry. addition increased...

A general representation for all non-negative, modulation invariant estimators of the frequency-wavenumber spectrum shows explicitly how quadratic estimates are constructed from linear transformations array data. The windows associated with these those normally 'classical' estimators. authors present closed form representations moments estimators, and show that variance decreases as number orthogonal increases. Since a time-bandwidth product bounds given selectivity, design process involves...