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Apr 1999

Volume 70, Issue 4, pp. 1907-2179

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Low-noise differentiator preamplifier for photogenerated signals

Luigi Rovati and Franco Docchio

Rev. Sci. Instrum. 70, 2169 (1999); http://dx.doi.org/10.1063/1.1149730 (2 pages) | Cited 1 time

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A low-noise preamplifier to perform a derivative of photogenerated signals is proposed. The novel structure is based on an inductive feedback preamplifier which performs preamplification and a derivative of the photogenerated current in a single stage. A breadboard circuit implementation and noise measurements are presented. Comparative noise measurements show that the proposed architecture is competitive with the classical differentiator preamplifier © 1999 American Institute of Physics.
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07.68.+m Photography, photographic instruments; xerography
84.30.Le Amplifiers
07.50.Hp Electrical noise and shielding equipment
84.37.+q Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)

A novel analog current-conveyor multiplier circuit

Umesh Kumar

Rev. Sci. Instrum. 70, 2171 (1999); http://dx.doi.org/10.1063/1.1149736 (2 pages) | Cited 1 time

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A four-quadrant analog current multiplier circuit is proposed by using Gilbert’s current Cell (Ref. ) and the modified current conveyor (Ref. ). © 1999 American Institute of Physics.
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07.68.+m Photography, photographic instruments; xerography
84.30.Sk Pulse and digital circuits

Apparatus for direct addition of reagents into a nuclear magnetic resonance (NMR) sample in the NMR probe

Charles L. Perrin and Ignacio A. Rivero

Rev. Sci. Instrum. 70, 2173 (1999); http://dx.doi.org/10.1063/1.1149737 (2 pages) | Cited 3 times

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Nuclear magnetic resonance (NMR) is a widely used tool in chemistry and biochemistry. It is occasionally necessary to add small aliquots of solvents or reagents repeatedly into the NMR tube. Ordinarily this is accomplished only by ejecting the sample and carrying out the addition outside the probe. It would be preferable to add the aliquot directly into the sample. We have designed and implemented a delivery system to accomplish this. This apparatus is particularly applicable to a recent NMR titration method for measuring relative pK’s and to experiments where temperature must also be varied. This apparatus provides a safe, simple, and inexpensive method for repeated aliquot addition directly into the sample in the NMR probe. © 1999 American Institute of Physics.
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07.57.Pt Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques
06.60.Ei Sample preparation (including design of sample holders)
82.80.Ms Mass spectrometry (including SIMS, multiphoton ionization and resonance ionization mass spectrometry, MALDI)

Contactless angle measurement

Dušan Ponikvar

Rev. Sci. Instrum. 70, 2175 (1999); http://dx.doi.org/10.1063/1.1149731 (2 pages)

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The apparatus described uses polarized light to trace the rotation angle of an object. The result of the measurement does not depend on the distance between the object and the base surface within a wide range, and the resolution is better than 0.25° with the full range of 180°. There are no electrical contacts to the rotating object. © 1999 American Institute of Physics.
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06.30.Bp Spatial dimensions (e.g., position, lengths, volume, angles, and displacements)
42.79.Ci Filters, zone plates, and polarizers

Nonswitching van der Pauw technique using two different modulating frequencies

G. T. Kim, J. G. Park, Y. W. Park, C. Müller-Schwanneke, M. Wagenhals, and S. Roth

Rev. Sci. Instrum. 70, 2177 (1999); http://dx.doi.org/10.1063/1.1149738 (2 pages) | Cited 5 times

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We present a nonswitching van der Pauw technique using two independent ac current sources and two lock-in amplifiers. This technique may be useful to measure the resistance of delicate samples that might be easily damaged by electric shocks induced from switching, and can be extended to measure the anisotropy of resistance. © 1999 American Institute of Physics.
Show PACS
84.37.+q Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)
84.30.Le Amplifiers
84.30.Jc Power electronics; power supply circuits
07.68.+m Photography, photographic instruments; xerography
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