Xem 1-20 trên 20 kết quả Electrochemical techniques
  • Corrosion is expensive and can be hazardous. It is costly to replace and repair equipment, structures, and other industrial items that have been damaged as a result of corrosion. In order to understand the mechanisms of corrosion, solve the corrosion problems, and improve the corrosion resistance of materials, the use of modern evaluation and protection techniques is essential. Therefore no significant progress can be achieved in this area without the use of modern evaluation methods combined with electrochemical techniques.

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  • Electrochemical systems—e.g., batteries, capacitors, and fuel cells—are an integral part of modern technology. Electrochemical techniques, especially potentiometry and voltammetry, are indispensable for state-of-the-art analysis, and also for fundamental studies of the properties of solution species and solid phases and materials. Last, but not least, electrochemical concepts for understanding charge transfer reactions entered the fields of biochemistry and biophysics.

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  • This book has been written to fill a gap in the literature of corrosion-protection coatings by offering a bridge between the very brief account of paints conveyed in most corrosion books and the very comprehensive, specialized treatises found in the polymer or electrochemical scientific publications.

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  • The book "Applied Fracture Mechanics" presents a collection of articles on application of fracture mechanics methods to materials science, medicine, and engineering. In thirteen chapters, a wide range of topics is discussed, including strength of biological tissues, safety of nuclear reactor components, fatigue effects in pipelines, environmental effects on fracture among others. In addition, the book presents mathematical and computational methods underlying the fracture mechanics applications, and also developments in statistical modeling of fatigue.

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  • In Chapter 4 of the first English edition of the book Portable Batteries by K. Eberts you can read: Our present knowledge of battery techniques traces back to times of four and a half thousand years ago. We can be sure that the copper vessels that were found from this time could only have been plated with gold by electrochemical means. In 1936 there was an archeological sensation.

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  • We have consistently found that in order to gain lasting commitment to the sales training process, we must recognize that people are different and they need the flexibility to incorporate what they already know with the new ideas we bring; this is the only way to get sincere and lasting buy-in and ownership. Beyond a base level of common program methodology and standards, we work privately with each participant to custom-tailor a plan that works with their unique personality, style and comfort level.

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  • To improve the diagnosis of tuberculosis (TB), more rapid diagnostic techniques such as antibody detection based on immunochromatographic methods were developed. The objective of this study was to evaluate the performance of the SD Rapid TB kit for the diagnosis of active TB with serums from patients and close contact controls in Antananarivo, Madagascar. Findings: We conducted a population-based case-control study. The sera of 60 confirmed TB patients and 60 healthy contacts paired for sex and age were tested.

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  • In India, Foot and Mouth Disease (FMD) research started in the then Imperial Bacteriological Laboratory at Mukteswar as early as in 1929. The work on the production of vaccines using cell culture technique commenced at Mukteswar in early sixties initially in goat kidney/calf kidney cell cultures and subsequently by 1971-72 with the availability of the BHK 21 cell line in monolayer cultures. With the increased demand for the FMD vaccines, the Bangalore campus of IVRI was established in 1972 with the objective of large scale production in fermenters.

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  • The West Pearl Queen reservoir project also used soil gas surveys to detect PFC tracers that were injected into the reservoir with the CO2. Soil gas sampling was conducted before and after the CO2 injection by using capillary tubes and adsorbent packets for the tracers. Brookhaven National Laboratory (BNL) supplied the tracers and performed the tracer concentration analysis (Wells et al., 2007). Near-Surface Geophysics – The use of magnetometers is another possible near-surface geophysical technique.

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  • The first difference to notice is that PRINCE2 is clearly project life cycle based with six out of eight major processes running from "Starting up a project" to "Closing a project". The remaining two, "Planning" and "Directing a project" are continuous processes supporting the other six. Each of these have their respective sub-process totaling 45 in all. Then, feeding into the system, are six "Components" some of which are documents and others that are themselves processes.

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  • This book has arisen from a series of lectures developed by Dr Gillan McMahon and delivered to students on the taught postgraduate module on instrumentation at Dublin City University. Gillian was previously herself a student in DCU and since graduating, she has developed her analytical background initially in industry in the pharmachem arena, and more recently, as a very successful academic teacher and researcher.

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  • Electrochemistry has been used extensively in the past three decades to determine the chemical composition of environmental samples from the water column, sediments, soils, biofilms, and microbial mats.

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  • These days, it is impossible to think of an area of knowledge that can keep on developing without a collaboration in interdisciplinary fields. Electromotive force is a type of energy per unit of electric charge that is converted reversibly from chemical, mechanical, or other forms of energy into electrical energy by a dynamo, battery, electrochemical cells, thermoelectric devices, solar cells, transformers, and so on. The theory of electromotive Force is currently one of the most important research topics within the electrical engineering domain.

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  • Nowadays, Chromatography is the most versatile and widespread technique employed in modern chemical analysis and plays a vital role in the advancement of chemistry, biology, medicine and related fields of research. Because of the inherent simplicity and ease of operation, it can be used together with a wide range of detection systems, including electrochemical, photometric and mass spectrometry, being an invaluable laboratory tool for the separation and identification of compounds.

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  •  Matched against a wide range of spectroscopic and chromatographic techniques, the techniques of electroanalytical chemistry find an important role for several reasons: – Electroanalytical methods are often specific for a particular oxidation state of an element – Electrochemical instrumentation is relatively inexpensive and can be miniaturized – Electroanalytical methods provide information about activities (rather than concentration)

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  • In this paper, nickel oxide thin films on the titanium substrate were prepared by the sol-gel dipcoating technique with the precursors NiSO4.7H2O and acetic acid. The obtained thin films have a good adhesion to the substrate. The electrochemical behaviors of the NiOxHy thin films were investigated in KOH 1 M solution by the voltammetry technique. The effect of addition of platinum, heating temperature and the dip coating number on the electrochemical behavior was also investigated. The thin films have high electrochemical properties at 270o C and at third dip coating.

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  • Chemical structure of -aminonaphthalene (ANa) allows to deal with its electrochemical polymerisation, analogously as for aniline. To determine the oxidation potentials of ANa, the polymerisation has been realised on Pt electrode using cyclic polarisation. It was found that in sulphuric acid 0.5 M the first oxidation starts at 620 mV/SCE with the peak potential at 760 mV, and the second oxidation at 890 mV/SCE with the peak potential at 1230 mV. The PANa film development decreases the current peaks meaning a reduction of polymerisation rate.

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  • The oxide reduction diffusion (ORD) procedure has recently been applied in synthesizing hydrogen storage materials AB5 for Ni-MH batteries. Starting from metal hydroxides and La oxalat precursor, superfine powder alloys LaNi5, LaNi4.5Co0.5 and LaNi3.87Mn1.13 were obtained by this “soft-chemistry” route. Chemical composition, structure and morphology of alloy phases were examined by different analysis techniques such as AAS, EPMA, X-ray and TEM. The H2-absorption and desorption behavior of crystalline products was determined by Sieverts’ method.

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  • One of the subjects of Ni-MH batteries studies is justly the electrochemically active material for the positive electrode-hydroxide nickel. This hydroxide Ni(OH)2 has been prepared in laboratory by chemical sedimentation from NiCl2 and NaOH solutions. The obtained product has been examined using different techniques, such as X ray Diffraction (XRD), Scanning Electronic Microscope (SEM) and electrochemical polarisation (cyclic voltammetry CV). The obtained results of obtained Ni(OH)2 show -type crystal, with grains of about 15 µm.

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  • Electrochemistry has been used extensively in the past three decades to determine the chemical composition of environmental samples from the water column, sediments, soils, biofilms, and microbial mats.

    pdf406p xunu1311 03-11-2012 35 1   Download

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