Arsenic (As) mobility in the environment is greatly affected by its oxidation state and the degree to which it is sorbed on metal oxide surfaces. Manganese oxides (Mn oxides) have the ability to decrease overall As mobility both by oxidizing toxic arsenite (As(III)) to less toxic arsenate (As(V)), and by sorbing As. However, the effect of competing ions on the mobility of As sorbed on Mn-oxide ...

There is a continuing need to develop effective materials for the environmental remediation of copper-contaminated sites. Nano-MnO₂-biochar composites (NMBCs) were successfully synthesized through the reduction of potassium permanganate by ethanol in a biochar suspension. The physicochemical properties and morphology of NMBCs were examined, and the Cu(II) adsorption properties of this material ...

Vertically oriented, self-organized TiO₂-MnO₂ nanotube arrays were successfully obtained by one-step anodic oxidation of Ti-Mn alloys in an ethylene glycol-based electrolyte. The as-prepared samples were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), UV-Vis absorption, photoluminescence spectroscopy, X-ray diffraction (XRD), and micro-Raman spec...

Non-linear electrical response in a charge/orbital ordered Pr 0.63 Ca 0.37 MnO 3 crystal : the charge density wave analogy. Abstract Non-linear conduction in a charge-ordered manganese oxide Pr 0.63 Ca 0.37 MnO 3 is reported. To interpret such a feature, it is usually proposed that a breakdown of the charge or orbitally ordered state is induced by the current. The system behaves in such a way t...

The aim of this study was to investigate the magnetic properties mixed nanocrystalline Zn/manganese oxide compounds synthesized by a hydrothermal method. These are designed as (ZnO)1−n(MnO)n, where index n ranges from 0.05 0.60. results measurements, including AC susceptibility function temperature (up 160 K) and frequency (from 7 Hz up 9970 Hz), well DC magnetization in fields 9 T 50 K, report...

Recently Kazama and Yokoi (arXiv:0801.1561 [hep-th]) have used a phase-space method to study the Virasoro algebra of type IIB superstring theory in the maximally supersymmetric R-R plane wave background in a semi-light-cone gauge. Two types of normal ordering have been considered, namely “phase space normal ordering” (PNO) and “massless normal ordering” (MNO). The second one, which is the right...

In this article we propose a pricing model for MNO and MVNO’s investment in 3G UMTS networks. We also investigate and conceptualize the relationship among MNO, MVNO, and other related variables in the proposed pricing model. Next, we develop the influence diagrams representing MNO and MVNO and use them to explore the relationship of total costs, total revenues, and net profit. This diagram is u...

The electron-phonon interaction is of central importance for the electrical and thermal properties of solids, and its influence on superconductivity, colossal magnetoresistance and other many-body phenomena in correlated-electron materials is the subject of intense research at present. However, the non-local nature of the interactions between valence electrons and lattice ions, often compounded...

Open cell foams consisting of Fe and Fe-Mn oxides are prepared from metallic Fe and Mn powder precursors by the replication method using porous polyurethane (PU) templates. First, reticulated PU templates are coated by slurry impregnation. The templates are then thermally removed at 260 °C and the debinded powders are sintered at 1000 °C under N₂ atmosphere. The morphology, structure, and magne...

In the present research, an efficient process for the synthesis of propargylamine derivatives catalyzed by a novel nanocomposite of CuO/MnO2 is reported. CuO/MnO2 nano-catalyst was synthesized by the co-precipitation process and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction(XRD), ICP-OES and BET surface area an...