Review of Scientific Instruments

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Construction of Thin Mylar Gas Target Holders
Review of Scientific Instruments - Tập 28 Số 6 - Trang 471-472 - 1957
J. C. Corelli, M. Stanley Livingston, L. Seidlitz
Auto- and cross-power spectral analysis of dual trap optical tweezer experiments using Bayesian inference
Review of Scientific Instruments - Tập 83 Số 9 - 2012
Yann von Hansen, Alexander Mehlich, Benjamin Pelz, Matthias Rief, Roland R. Netz
The thermal fluctuations of micron-sized beads in dual trap optical tweezer experiments contain complete dynamic information about the viscoelastic properties of the embedding medium and—if present—macromolecular constructs connecting the two beads. To quantitatively interpret the spectral properties of the measured signals, a detailed understanding of the instrumental characteristics is r...... hiện toàn bộ
A Mott polarimeter operating at MeV electron beam energies
Review of Scientific Instruments - Tập 82 Số 3 - 2011
V. Tioukine, K. Aulenbacher, E. Riehn
We have developed a Mott electron polarimeter for the Mainzer microtron (MAMI) accelerator in Mainz, Germany. At beam energies ranging between 1.0 and 3.5 MeV two double focusing magnet spectrometers collect elastically backscattered electrons from gold targets. In spite of the small spectrometer acceptance, a sufficient statistical efficiency is achieved to provide very fast measurements ...... hiện toàn bộ
Optimization of the perturbation signal for electrochemical impedance spectroscopy in the time domain
Review of Scientific Instruments - Tập 64 Số 11 - Trang 3111-3115 - 1993
G Popkirov, R. N. Schindler
The choice of the perturbation wave form is of crucial importance for reliable electrochemical impedance spectroscopy measurements based on the fast Fourier transformation. Using numerical simulation, arguments and results are presented for the choice and the optimization of a perturbation signal constructed as a superposition of discrete sine waves with selected frequencies. Two possible ...... hiện toàn bộ
Accurate determination of the electrical resistivity from mutual inductance measurements
Review of Scientific Instruments - Tập 46 Số 4 - Trang 398-408 - 1975
Michael D. Rosenthal, B. W. Maxfield
When a conducting specimen is placed inside a coil, the coil impedance changes. For simple coil and specimen geometries, the impedance change can be related to the electrical resistivity of the specimen. This paper describes a variety of methods for the accurate determination of the resistivity of a cylindrical specimen from the measured change in mutual inductance of a cylindrically symme...... hiện toàn bộ
Viscoelastic measurement techniques
Review of Scientific Instruments - Tập 75 Số 4 - Trang 797-810 - 2004
Roderic S. Lakes
Methods for measuring viscoelastic properties of solids are reviewed. The nature of viscoelastic response is first presented. This is followed by a survey of time and frequency-domain considerations as they apply to mechanical measurements. Subresonant, resonant, and wave methods are discussed, with applications.
Rapid and Sensitive Spectrophotometry. III. A Double Beam Apparatus
Review of Scientific Instruments - Tập 22 Số 8 - Trang 634-638 - 1951
Britton Chance
An apparatus for accurately timing the sequence of spectroscopic events in turbid suspensions of the cytochrome oxidase system has been developed. This apparatus measures simultaneously small optical density changes occurring at two wavelengths in the visible region with a small spectral interval in spite of the large scattering of light by the heart muscle suspensions. The cross talk betw...... hiện toàn bộ
Thermal conductivity, thermal diffusivity, and specific heat of thin samples from transient measurements with hot disk sensors
Review of Scientific Instruments - Tập 65 Số 12 - Trang 3856-3859 - 1994
Mattias Gustavsson, Ernest Karawacki, Stefan Gustafsson
Transient measurements of thermal conductivity, thermal diffusivity, and specific heat capacity have been performed with hot disk sensors in thin samples of metallic materials. With this new variation of the hot disk method the sample size can be reduced to a volume less than ten cubic centimeters for copper at room temperature. It is also shown that the specific heat capacity can be conve...... hiện toàn bộ
Rapidly pulsed helium droplet source
Review of Scientific Instruments - Tập 80 Số 4 - 2009
Dominik Pentlehner, Ricarda Riechers, Bernhard Dick, Alkwin Slenczka, U. Even, N. Lavie, Raviv Brown, Kfir Luria
A pulsed valve connected to a closed-cycle cryostat was optimized for producing helium droplets. The pulsed droplet beam appeared with a bimodal size distribution. The leading part of the pulse consists of droplets suitable for doping with molecules. The average size of this part can be varied between 104 and 106 helium atoms, and the width of the distribution is smaller as compared to a c...... hiện toàn bộ
Intense pulsed helium droplet beams
Review of Scientific Instruments - Tập 73 Số 10 - Trang 3600-3605 - 2002
Mikhail N. Slipchenko, Susumu Kuma, Takamasa Momose, Andrey F. Vilesov
Pulsed (30–100 μs) nozzle beams have been used to generate helium droplets (〈N〉=104–105). The dependence of the beam intensity and the mean droplet size on the source stagnation pressure and temperature are studied via mass spectroscopy and laser induced fluorescence of embedded phthalocyanine molecules. In comparison to a cw beam the pulsed source for the same pressure and temperature has...... hiện toàn bộ
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