Abstract:
A method of determining the concentration of a nonelectrolyte contained in an electrolyte solution, which comprises preparing a graph showing the relationship between electric conductivity and nonelectrolyte concentration by measuring the electric conductivities of various solutions each containing a mixture of an electrolyte with a nonelectrolyte and determining the concentration of a target nonelectrolyte contained in the solution on the basis of the above graph by using the measured electric conductivity of the solution.
Abstract:
A pH measuring combined electrode including a glass electrode, a reference electrode and a thermosensitive resistance element for temperature compensation integrated into a compact miniaturized assembly. At least the inner electrode of the glass electrode is constituted by a glass-coated lead-in wire and the thermosensitive resistance element is arranged in direct proximity to the inside wall of the pH sensitive glass membrane of the glass electrode. A guard ring is preferably provided around an electrode supporting tube to assist in maintaining clearance between the lead-in wires at their juncture with the electrode assembly.
Abstract:
1,084,879. Directly heated thermistors. TOA ELECTRONICS Ltd. Nov. 4, 1965 [Nov. 7, 1964], No. 46791/65. Heading H1K. The voltage-current characteristic of a directly heated thermistor is rendered substantially independent of ambient temperature over part of the working range by sealing it in a vessel containing a substance adsorbed on its walls. The substance is chosen so that its vapour pressure increases with rising ambient temperature to such an extent that the reduction in heat loss by direct radiation and conduction along the lead wires is offset by a corresponding increase in heat loss-through the vapour. In the embodiment the thermistor is of vanadium glass and has platinum electrodes attached to Dumet leads. The adsorbed substance, water, is introduced into the glass vessel enclosing it by first evacuating at elevated temperature, introducing the water in the form of humid air and then evacuating to a desired degree of vacuum.
Abstract:
The method of the present invention comprises the steps of irradiating near-infrated rays to a plastics of an unknown type to measure the NIR spectrum thereof, determining the first-derivative or second-derivative, measuring the differential spectrum at prescribed intervals of wavelength over a region of measurement wavelengths, determining the class of whether the differential spectrum for each measurement wavelength is on the plus-side, minus-side or any other side, comparing the resultant class data with those of previously determined differential spectra for plastics of known types to determine the ratio of agreement between the thus compared data (agreement ratio), and determining that the plastics showing the highest agreement ratio is the type of the plastics of the unknown type. By using the above-mentioned agreement ratio, it is possible to simply and rapidly determine the type of a plastics by means of the differential spectrum of near-infrared rays.