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
Auto- and cross-power spectral analysis of dual trap optical tweezer experiments using Bayesian inference
Review of Scientific Instruments - Tập 83 Số 9 - 2012
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 required....
A Mott polarimeter operating at MeV electron beam energies
Review of Scientific Instruments - Tập 82 Số 3 - 2011
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
if beam ...
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
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
ways to ...
Accurate determination of the electrical resistivity from mutual inductance measurements
Review of Scientific Instruments - Tập 46 Số 4 - Trang 398-408 - 1975
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
symmetric coi...
Viscoelastic measurement techniques
Review of Scientific Instruments - Tập 75 Số 4 - Trang 797-810 - 2004
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
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
between the ...
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
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
conveniently ...
Rapidly pulsed helium droplet source
Review of Scientific Instruments - Tập 80 Số 4 - 2009
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 continuou...
Intense pulsed helium droplet beams
Review of Scientific Instruments - Tập 73 Số 10 - Trang 3600-3605 - 2002
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 a facto...
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