摘要:
Disclosed in certain embodiments is a method of determining the individual concentration of different antioxidants of the same class in a sample comprising contacting the sample with an effective amount of phenol; and analyzing the sample by voltammetry.
摘要:
A system for measuring light absorption levels includes a light source providing a light beam and a container for a liquid. The container includes an opening to provide access to the liquid. A prism is disposed over the opening and is operable to direct at least a first portion of the light beam toward the opening to the liquid such that the at least a portion of the first portion of the light beam is reflected back from the liquid forming an attenuated beam. A detector is operable to measure at least one of a portion of the attenuated beam and a second portion of the light beam. The detector is operable to produce at least one of a liquid measurement signal and a reference signal. A device is operable to compute a ratio of the liquid measurement signal to the reference signal to determine a signal ratio.
摘要:
A water-soluble polymer coating for application to electrical wiring used in aircraft and other electrical structures is provided. The coating includes a water-soluble polymer such as polyvinyl acetate, polyvinyl alcohol, and methyl cellulose which is dissolved in water to form a solution. The solution may be applied to electrical wiring during manufacturing and dried to a film such that if the wire becomes damaged and exposed to water, a protective water-insoluble deposit is formed on the wiring. Alternatively, the solution may be applied to wiring which is already damaged to form a protective water-insoluble deposit.
摘要:
Disclosed in certain embodiments is a method of determining the individual concentration of different antioxidants of the same class in a sample comprising contacting the sample with an effective amount of phenol; and analyzing the sample by voltammetry.
摘要:
A method of detecting the amount of sulfur compounds in fuels such as ultra low sulfur diesel (ULSD) fuels is provided in which a fuel sample is reacted with a solvent and an oxidizing agent to produce a reaction product which may be analyzed by visual observation and/or in combination with spectrophotometric or colorimetric analysis. The oxidizing agent may be selected from potassium permanganate, sodium dichromate, nitric acid, hydrogen peroxide, cumene hydroperoxide, and sodium hypochlorite, and may be used in combination with an acid.
摘要:
A method and apparatus are disclosed for the analysis of a fluid to determine the remaining useful life of the fluid and whether the fluid has become contaminated. The method can be performed either on-line or off-line, however, the on-line method is preferred. In the method, a sample of the fluid is contacted by a single electrode which is connected to the ground potential by means of the equipment in which the fluid is used. A current is applied to the sample through the electrode and the conductivity of the sample is measured. The conductivity measurement can then compared to known values for the fluid to determine the remaining useful life of the fluid and whether the fluid has become contaminated.
摘要:
A method for the analysis of peroxide in hydrocarbon fuels such as jet fuels, diesel fuel, kerosene and gasoline is disclosed which can be performed both at remote locations as well as in a laboratory setting. A sample of the fuel to be tested is mixed with a solution containing a water-soluble salt and aqueous iodide solution to reduce the peroxide and produce free iodine. The sample is then subjected to a single sweep voltammetric analysis to measure the current through the sample as a function of the potential applied. The resulting peak of current on a current-potential plot can then be used to determine the amount of peroxide in solution.
摘要:
A water-soluble polymer coating for application to electrical wiring used in aircraft and other electrical structures is provided. The coating includes a water-soluble polymer such as polyvinyl acetate, polyvinyl alcohol, and methyl cellulose which is dissolved in water to form a solution. The solution may be applied to electrical wiring during manufacturing and dried to a film such that if the wire becomes damaged and exposed to water, a protective water-insoluble deposit is formed on the wiring. Alternatively, the solution may be applied to wiring which is already damaged to form a protective water-insoluble deposit.
摘要:
Disclosed in certain embodiments is a method of determining the individual concentration of different antioxidants of the same class in a sample comprising contacting the sample with an effective amount of phenol; and analyzing the sample by voltammetry.
摘要:
Smart aerospace structures are described herein utilizing a deactivated RFID tag including an IC and an electrical by-pass. The electrical by-pass is conductive and the electrical by-pass is in parallel with the IC such that the deactivated RFID becomes activated upon an abnormal condition, such as an improper clamp installation, a clamp failure, an impact, a thermal event or a crack.