Xem 1-20 trên 57 kết quả Electrochemical oxidation
  • The electrophoretic deposition (EPD) method was adopted for a fabrication of nanocomposite layers composed of ZnO particles covered by the polythiopene shell in a reduced state. This composite was prepared by oxidative polymerization of thiophene monomer with iron (III) chloride as a catalyst in the presence of ZnO particles. After polymerization, polythiophene in oxidized form was reduced by the extraction in methanol. Electrochemical properties of the obtained composite were measured by cyclic voltammetry and electrochemical impedance spectroscopy.

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  • Vascular dysfunction may also reduce oxygen delivery to gingival tissue. Pocket oxygen tension was reported to be significantly lower in smokers than non-smokers providing support for the negative effects of smoking on vascular system (Hanioka et al. 2000). Evidence from both human and experimental studies suggests that smoking has a long-term chronic effect, and its effect is not simply a vasoconstriction.

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  • Electrochemistry has been undergoing significant transformations in the last few decades. It is now the province of academics interested only in measuring thermodynamic properties of solutions and of industrialists using electrolysis or manufacturing batteries, with a huge gap between them. It has become clear that these, apparently distinct subjects, alongside others, have a common ground and that they have grown towards each other, particularly as a result of research into the rates of electrochemical processes....

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  • are not limited to: the wide range of oxidation and reduction reactions possible, the possibility of reaching very high levels of product purity and selectivity, and significantly less energy requirement. The process of electropolymerization leads to simple and reproducible formations of polymer films, which led to a broad material diversity of applications. Nowadays, electrochemistry plays an important role in a wide number of fundamental research and applied areas.

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  • In recent years, great focus has been placed upon polymer thin films. These polymer thin films are important in many technological applications, ranging from coatings and adhesives to organic electronic devices, including sensors and detectors. Polymers can be prepared using chemical and/or electrochemical methods of polymerization. There are a few advantages of electrosynthesis over chemical methods.

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  • According to American Society for Testing and Materials' corrosion glossary, corrosion is defined as "the chemical or electrochemical reaction between a material, usually a metal, and its environment that produces a deterioration of the material and its properties".1 Other definitions include Fontana's description that corrosion is the extractive metallurgy in reverse,2 which is expected since metals thermodynamically are less stable in their elemental forms than in their compound forms as ores.

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  • Forty undergraduate students from three different faculties were recruited for the study. Using official IELTS Test results obtained by the students at the beginning of their study in Australia and towards the end, as well as interviews with most of the students, the study investigated patterns of improvement, as well as lack of improvement among the 40 students. While most of the students in the study did achieve a higher score in the IELTS Test taken towards the end of their study in Australia, only a small number were able to achieve an Overall score of 7.0, with at least...

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  • ‘Metallically’ conducting polymers show good intrinsic conductivity, at least in the charged state. The specific capacitance values, potential ranges, long-term stabilities, and cycle lives of supercapacitors based on polymers are rather moderate, compared to the cycle lives of those based on carbon and metal oxide materials.

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  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Influences of graphene oxide support on the electrochemical performances of graphene oxide-MnO2 nanocomposites

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  • The study conducted by Hiller et al. (2011) to investigate the concentrations, distributions, and hazards of polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs). PCBs are used mainly as coolant and electronic industries (capacitors, transformers), paints, sealants for wood, cutting and lubricating fluids, plasticizers, and as dielectric fluids. Therefore, at the former site of PCB manufacturing area in Slovakia, high concentrations of PCBs are detected in soils, sediments, humans, and wildlife (Kocan et al., 2001; Petrik et al., 2001; Hiller et al., 2011)....

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  • Electrochemical double-layer capacitors store electrical energy at the phase boundary between an electronic conductor (electrode) and a liquid ionic conductor (electrolyte solution). In contrast to that, electrostatic space charge layers at dielectric oxide films, formed anodically on etched aluminum or tantalum foils of conventional electrolytic capacitors, should not be confused with the electrochemical double layer.

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  • In its report to the G7 titled Report of the Financial Stability Forum on Enhancing Market and Institutional Resilience, 1 the Financial Stability Forum (FSF) requested the Joint Forum to conduct a stocktaking of the uses of external credit ratings by its member authorities in the banking, securities and insurance sectors. The request also suggested that authorities review whether their regulations and/or supervisory policies unintentionally give credit ratings an official seal of approval that discourages investors from performing their own due diligence.

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  • In this section we look at data concerning 10-year government bond yields. Although our main interest is the default risk, this presents only one channel through which fiscal policies can affect long-term yields. There are other channels operating through monetary-fiscal interaction, which should be reflected in the evolution of yields. Therefore we start our descriptive analysis in this section by looking at yields, forward rates and inflation expectations at a weekly frequency. Then we move to an analysis of interest rate swap spreads, at a weekly and daily frequency.

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  • The accounting treatment of investments in property, plant and equipment and intangible assets entails the use of estimates to determine the useful life for depreciation and amortization purposes and to assess fair value at their acquisition dates for assets acquired in business combinations. Determining useful life requires making estimates in connection with future technological developments and alternative uses for assets.

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  • There is currently no independent authoritative statement on the nature and importance of differences in content of nutrients and other nutritionally relevant substances (nutrients and other substances) in organically and conventionally produced foodstuffs. This systematic review of the available published literature was designed to seek to determine the size and relevance to health of any differences in content of nutrients and other substances in organically and conventionally produced crops and livestock products.

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  • Information -- or more precisely, better information -- can be viewed much like any other commodity in that it is costly to acquire and provides benefits to the user. The goal is to identify the kinds of situations in which improvements in data or methods are likely to yield the greatest net benefit. From an economic standpoint, information itself has little intrinsic value. Instead, information acquires value when it facilitates optimizing behavior. That is, better information can lead to changes in actions, changes that themselves create value.

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  • A more engaging movie experience depends on sitting closer to the screen. But how close is close? The answer varies by screen size. The same viewing distance that is “close” for a 70-foot screen is “far” for a 20-foot screen. To account for screens of different sizes, we need a special way to measure viewing distance. That’s why engineers consider viewing distance as a multiple of Picture Height (PH). Based on widely-accepted measures for the threshold of visual acuity, 2K presentation will satisfy audience members with 20/20 vision who sit at distances of 3.

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  • Manufacture of metal oxide electrodes: Thermochemical oxide layers, metal oxide hydrates, amorphous and crystalline powders, and supported and adsorbed ruthenium di-oxide (RuO2).

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  • It is likely that with climate change (which could lead to increased rainfall, river flows, and higher coastal storm surges) and development pressures, flood risk in England is going to increase in the future, with potentially the most significant changes likely to happen in the latter half of the century. The Environment Agency has prepared a Long-term investment strategy that will allow us to understand future levels of risk and what investment may be needed to manage it over the next 25 years and beyond.

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  • Greenhouse gases such as CO2 and methane are believed to contribute to global warming. Dust is a common problem throughout all mining activities. Dust generated by vehicle traffic can be reduced through a variety of means. Where water resources are not limited, regular watering with mobile water trucks or fixed sprinkler systems is effec- tive. Otherwise the application of surface binding agents, the selection of suitable construction materials and the sealing of heavily used access ways may be more suitable.

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