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Страница 1 от 20 резултата
Extraordinary pseudocapacitive energy storage triggered by phase transformation in hierarchical vanadium oxides.
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Pseudocapacitance holds great promise for improving energy densities of electrochemical supercapacitors, but state-of-the-art pseudocapacitive materials show capacitances far below their theoretical values and deliver much lower levels of electrical power than carbon-based materials due to poor
Hydrogen-induced morphotropic phase transformation of single-crystalline vanadium dioxide nanobeams.
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We report a morphotropic phase transformation in vanadium dioxide (VO2) nanobeams annealed in a high-pressure hydrogen gas, which leads to the stabilization of metallic phases. Structural analyses show that the annealed VO2 nanobeams are hexagonal-close-packed structures with roughened surfaces at
Defected vanadium bronzes as superb cathodes in aqueous zinc-ion batteries
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There is a growing need for fast, efficient, safe, and low-cost energy storage. Aqueous zinc-ion batteries (AZIBs) may be able to address this need, but suffer from fast capacity fade and poor ion diffusion kinetics due to unstable structures and non-optimised interspacing of layered cathode
Boilermakers' bronchitis. Respiratory tract irritation associated with vanadium pentoxide exposure during oil-to-coal conversion of a power plant.
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Severe respiratory tract irritation occurred in at least 74 of 100 boilermakers who were exposed to high levels of vanadium pentoxide fume during oil-to-coal conversion of a utility company power plant in a rural area of western Massachusetts. Many were welders working in confined areas with
Selective hypoxia-cytotoxins based on vanadyl complexes with 3-aminoquinoxaline-2-carbonitrile-N1,N4-dioxide derivatives.
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A new vanadyl complex with the formula VO(L1)2, where L1=3-amino-6(7)-chloroquinoxaline-2-carbonitrile N(1), N(4)-dioxide, has been synthesized and characterized by elemental analyses, conductometry, fast atom bombardment mass spectroscopy (FAB-MS) and electronic, Fourier transform infrared (FTIR),
Hypoxia inhibits nitric oxide synthesis in isolated rabbit lung.
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Nitric oxide (NO.) has been proposed to modulate hypoxic vasoconstriction in the lung. The activity of nitric oxide synthase (NOS) can be inhibited by hypoxia because molecular oxygen is a necessary substrate for the enzyme. On the basis of this mechanism, we hypothesized that NOS activity has a key
Essentiality and toxicity of vanadium supplements in health and pathology.
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The biological properties of vanadium complexes have become an object of interest due to their therapeutic potential in several diseases. However, the mechanisms of action of vanadium salts are still poorly understood. Vanadium complexes are cofactors for several enzymes and also exhibit
Insulin-like vs. non-insulin-like stimulation of glucose metabolism by vanadium, tungsten, and selenium compounds in rat muscle.
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The direct impact of vanadate, tungstate, selenate, and selenite on glucose metabolism of isolated rat soleus muscle was investigated. All compounds stimulated glucose transport, but only vanadate exerted an insulin-like effect on glycogen synthesis (mumol glucose into glycogen*g-1*h-1: control 1.43
Nitrogen isotope fractionation by alternative nitrogenases and past ocean anoxia.
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Biological nitrogen fixation constitutes the main input of fixed nitrogen to Earth's ecosystems, and its isotope effect is a key parameter in isotope-based interpretations of the N cycle. The nitrogen isotopic composition (δ(15)N) of newly fixed N is currently believed to be ∼-1‰, based on
Cigarette smoking increases endothelial-derived vasorelaxation in the rat carotid artery in a dose-dependent manner.
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While there is clear-cut epidemiologic, morphologic, and functional evidence to suggest that cigarette smoking is deleterious to the cardiovascular system and endothelium, previous experiments with regard to the effect of cigarette smoking on endothelial-derived vasorelaxation are not conclusive.
A retrospective analysis of trace metals, C, N and diatom remnants in sediments from the Mississippi River delta shelf.
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The development of oil and gas recovery offshore of the Mississippi River delta began in shallow water in the 1950s, expanded into deeper waters, and peaked in the 1990s. This area of the outer continental shelf (OCS) is the historical and present location of >90% of all US OCS oil and gas
Does Each Atom Count in the Reactivity of Vanadia Nanoclusters?
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Vanadium oxide cluster anions (V2O5)nVxOy- (n = 1-31; x = 0, 1; and x + y ≤ 5) with different oxygen deficiencies (Δ = 2y-1-5x = 0, ± 1, and ±2) have been prepared by laser ablation and reacted to abstract hydrogen atoms from alkane molecules (n-butane) in a fast flow reactor. When the cluster size
Association of adrenal pheochromocytoma and lung pathology in inhalation studies with particulate compounds in the male F344 rat--the National Toxicology Program experience.
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Systemic hypoxemia, occurring in space-occupying lung pathologies such as inflammation and neoplasms. reduces the gas exchange area and stimulates catecholamine secretion from the adrenal medulla where chronic endocrine hyperactivity may lead to hyperplasia and neoplasia. We investigated the
Interlayer switching of reduction in layered oxide, Bi4V2O(11-δ) (0 ≤ δ ≤ 1).
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In contrast to the rich oxygen nonstoichiometry in vanadium oxides, we report here an interesting Bi4V2O(11-δ) oxide system whose vanadate layer allows only a narrow oxygen deficiency range. Beyond δ = 0.4, reduction of Bi4V2O(11-δ) does not proceed in the V-O layer, but instead suddenly switches to
Evolution of Structural and Electrical Properties of Oxygen-Deficient VO2 under Low Temperature Heating Process.
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Structural stability and functional performances of vanadium dioxide (VO2) are strongly influenced by oxygen vacancies. However, the mechanism of metal-insulator transition (MIT) influenced by defects is still under debate. Here, we study the evolution of structure and electrical property of
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