The Institute of Physics ( IOP ) по журналам "Journal of Physics E: Scientific Instruments"
Отображаемые элементы 1-20 из 104
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(1978-07-01)A high-voltage pulse generator is described which produces 20 kV rectangular pulses having 10 ns rise and fall times, a duration from 30 ns up to milliseconds and repetition rates up to 50 pulses s-1. The main advantages ...
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(1987-06-01)An apparatus has been developed for obtaining high nuclear polarisation by means of microwave-induced optical nuclear polarisation. In this recent variety of dynamic nuclear polarisation (DNP), the sample is doped with ...
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(1980-06-01)In low-energy noble gas ion scattering (LEIS) neutralisation plays an important role. Comparison of energy spectra of neutral scattered particles with ion spectra, and ion fractions derived from these data, provides ...
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(1969-11-01)A cryostat is described for the measurement of magnetic susceptibilities at all temperatures from 03 to 20K in one single experiment. The susceptibility is measured by the a.c. mutual inductance method. The sample, kept ...
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(1986-07-01)A new method is introduced for screening or reducing extraneous magnetic fields outside coil structures. The method utilises a set of current-carrying conductors or a discrete wire array to simulate the induced surface ...
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(1968-06-01)A description is given of a device which provides automatic long-term control of the size of aerosol particles produced by the La Mer generator. The control system input signal is derived from the light-scattering properties ...
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(1968-09-01)A differential solution calorimeter is described, by means of which heats of solution of non-electrolytes in water can be determined in the mole fraction concentration range 005-20 103. Heats of solution of ethanol and ...
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(1980-11-01)The device described incorporates a helium gas flow cryostat for measurements down to 4.2K. By setting the crystal on the flank of the rocking curve, the change in lattice parameter is deduced from the change in intensity ...
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(1979-02-01)A source is described which is capable of providing high intensity in the resonance lines of neutral and singly ionised metallic species, especially group II metals. Detailed analysis of the line profiles is presented which ...
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(1970-09-01)A silica torsion microbalance of a sensitivity of 137 107 g mm1 and a capacity of 60 mg has been constructed for study of the vacuum deposition process. Since the experimental apparatus has been so designed that it may ...
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(1969-04-01)A scanning device is described which allows accurate localization in one dimension of the distribution of weak beta radiation (14C and 35S) over a planar surface. A single uncooled photomultiplier tube is used with a very ...
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(1984-01-01)A broadband (25 MHz) waveform-recording system yielding a high voltage resolution (10 nV range) by signal averaging is described. It consists of a transient recorder Biomation 8100 coupled to a PDP 11/04 computer via a ...
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(1968-07-01)A laser Doppler velocimeter is described in which the laser is employed not only as a light source, but also as a mixer-oscillator, in order to give a simpler optical system. The efficiency is comparable to that of a ...
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(1971-03-01)An iterative technique using a continuous gas laser is described for alignment of a Mach-Zehnder interferometer, for monochromatic as well as white light fringes. Simple rotational and translational adjustments were used ...
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(1981-07-01)A refined method for the reduction of the signal-to-noise ratio in pressure-scanned Fabry-Perot interferometer measurements is described. This is achieved by phase-correct superposition of the individual interference orders. ...
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(1968-01-01)The black-body radiation source described is suitable for calibrating net pyrradiometers with sensor plates up to 5 cm in diameter. Its temperature is variable up to 140C, and its large thermal capacity minimizes short ...
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(1976-11-01)The circuitry and the properties of a low-cost preamplifier/discriminator, using monolithic integrated emitter-coupled logic (ECL) circuits, are described. The resolution of input pulse pairs is better than 10 ns with ...
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(1971-05-01)An apparatus for measuring the pore-size distribution over the range 300-7 mu m is described. The apparatus is constructed from a modified Amsler machine and the results are in good agreement with those obtained using a ...
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(1968-02-01)An automated low temperature system, compatible with the PAILRED and other automatic diffractometers, has been developed and put into operation. Temperatures from ambient to 180C can be maintained within 02 degC for the ...
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(1978-02-01)A modification to the Chromatix CMX-4 dye laser is described which enables the wavelength of the ultraviolet frequency-doubled output to be switched on alternate pulses between two values up to about 1 nm apart. This ...
Отображаемые элементы 1-20 из 104