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This page shows you the most recent publications within this specialty of the MedWorm directory.

Dedicated vertical wind tunnel for the study of sedimentation of non-spherical particles
G. H. Bagheri, C. Bonadonna, I. Manzella, P. Pontelandolfo, and P. Haas A dedicated 4-m-high vertical wind tunnel has been designed and constructed at the University of Geneva in collaboration with the Groupe de competence en mecanique des fluides et procedes energetiques. With its diverging test section, the tunnel is designed to study the aero-dynamical behavior of no ... [Rev. Sci. Instrum. 84, 054501 (2013)] published Thu May 16, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Theoretical and experimental study on two-stage-imaging microscopy using ellipsometric contrast for real-time visualization of molecularly thin films
Y. Kajihara, K. Fukuzawa, S. Itoh, R. Watanabe, and H. Zhang A two-stage-imaging ellipsometric-contrast microscope (TIEM) has been developed to measure the distribution of film thickness over a wide area of molecularly thin liquid films with a high lateral resolution, wide field of view, high thickness resolution, and high-speed. Moreover, this ellipsometric ... [Rev. Sci. Instrum. 84, 053704 (2013)] published Thu May 16, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Differential interference contrast microscopy using light-emitting diode illumination in conjunction with dual optical traps
C. Battle, L. Lautscham, and C. F. Schmidt Differential interference contrast (DIC) microscopy is a common mode of biological light microscopy used to achieve maximal resolution and contrast with label-free, weakly absorbing specimens such as cells. Maintaining the polarization state of the illuminating light is essential for the technique, ... [Rev. Sci. Instrum. 84, 053703 (2013)] published Thu May 16, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

New Products
Andreas Mandelis Abstract not available. [Rev. Sci. Instrum. 84, 059501 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Note: Operation of gamma-ray microcalorimeters at elevated count rates using filters with constraints
B. K. Alpert, R. D. Horansky, D. A. Bennett, W. B. Doriese, J. W. Fowler et al. Microcalorimeter sensors operated near 0.1 K can measure the energy of individual x- and gamma-ray photons with significantly more precision than conventional semiconductor technologies. Both microcalorimeter arrays and higher per pixel count rates are desirable to increase the total throughput of s ... [Rev. Sci. Instrum. 84, 056107 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Note: A compact, rigid, and easy-to-build piezo motor: The intact-tube GeckoDrive
We report an extremely simple, rigid, low machine tolerance, yet high performance piezoelectric motor, in which two rings are coaxially glued at the ends of one intact piezotube, respectively, using the proper gluing method. A central shaft is pushed to press against the inner edges of the rings by ... [Rev. Sci. Instrum. 84, 056106 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

A nuclear magnetic resonance spectrometer concept for hermetically sealed magic angle spinning investigations on highly toxic, radiotoxic, or air sensitive materials
L. Martel, J. Somers, C. Berkmann, F. Koepp, A. Rothermel et al. A concept to integrate a commercial high-resolution, magic angle spinning nuclear magnetic resonance (MAS-NMR) probe capable of very rapid rotation rates (70 kHz) in a hermetically sealed enclosure for the study of highly radiotoxic materials has been developed and successfully demonstrated. The con ... [Rev. Sci. Instrum. 84, 055112 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

A high-impedance attenuator for measurement of high-voltage nanosecond-range pulses
Binxiong Yu, Jinliang Liu, Tianyang Zhang, and Zhiqiang Hong A novel kind of high-impedance cable attenuator for measurement of high-voltage ns-range pulses is investigated in this paper. The input and output ports of the proposed attenuator were both high-impedance ports, and good pulse response characteristics of the proposed attenuator were obtained with p ... [Rev. Sci. Instrum. 84, 055111 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Measurement of ultra-low power oscillators using adaptive drift cancellation with applications to nano-magnetic spin torque oscillators
S. Tamaru and D. S. Ricketts This work presents a technique for measuring ultra-low power oscillator signals using an adaptive drift cancellation method. We demonstrate this technique through spectrum measurements of a sub-pW nano-magnet spin torque oscillator (STO). We first present a detailed noise analysis of the standard ST ... [Rev. Sci. Instrum. 84, 054704 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Sensitive thermal transitions of nanoscale polymer samples using the bimetallic effect: Application to ultra-thin polythiophene
O. Ahumada, M. M. Perez-Madrigal, J. Ramirez, D. Curco, C. Esteves et al. A sensitive nanocalorimetric technology based on microcantilever sensors is presented. The technology, which combines very short response times with very small sample consumption, uses the bimetallic effect to detect thermal transitions. Specifically, abrupt variations in the Young's modulus and the ... [Rev. Sci. Instrum. 84, 053904 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Hard x-ray tomographic studies of the destruction of an energetic electron ring
Y. Wang, W. Gekelman, and P. Pribyl A tomography system was designed and built at the Large Plasma Device to measure the spatial distribution of hard x-ray (100 KeV-3 MeV) emissivity. The x-rays were generated when a hot electron ring was significantly disrupted by a shear Alfven wave. The plasma is pulsed at 1 Hz (1 shot/s). A lead s ... [Rev. Sci. Instrum. 84, 053503 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Data processing and analysis of the imaging Thomson scattering diagnostic system on HT-7 tokamak
Xiaofeng Han, Chunqiang Shao, Xiaoqi Xi, Junyu Zhao, Zang Qing et al. A high spatial resolution imaging Thomson scattering diagnostic system was developed in ASIPP (Institute of Plasma Physics, Chinese Academy of Sciences). After about one month trial running on the superconducting HT-7 (Hefei Tokamak-7) tokamak, the system was proved to be capable of measuring plasma ... [Rev. Sci. Instrum. 84, 053502 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Absolute photo-destruction and photo-fragmentation cross section measurements using an electrostatic ion beam trap
We describe a technique to measure absolute photo-induced cross sections for cluster anions stored in an electrostatic ion beam trap (EIBT) with a central deflector. The setup allows determination of total photo-destruction cross sections as well as partial cross sections for fragmentation and elect ... [Rev. Sci. Instrum. 84, 053106 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Time-domain reflectometry of high-voltage nonlinear loads with picosecond resolution
K. A. Sharypov, V. G. Shpak, S. A. Shunailov, M. R. Ul'masculov, and M. I. Yalandin The construction and characterization of a measuring module for high voltage time-domain reflectometry with picosecond resolution is presented. The device provides registration of low-distortion reflections from the load at conditions of irregular shape and pronounced instability of an incident prob ... [Rev. Sci. Instrum. 84, 055110 (2013)] published Tue May 14, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Characterization system for research on energy storage capacitors
J. R. Noriega, O. D. Iyore, C. Budime, B. Gnade, and J. Vasselli In this work a characterization system for high energy-density capacitors is described and demonstrated. Capacitors are being designed using thin-film technology in an attempt to achieve higher energy-density levels by operating the devices at a high voltage. These devices are fabricated from layers ... [Rev. Sci. Instrum. 84, 055109 (2013)] published Tue May 14, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

The extended wedge method: Atomic force microscope friction calibration for improved tolerance to instrument misalignments, tip offset, and blunt probes
H. S. Khare and D. L. Burris One of the major challenges in understanding and controlling friction is the difficulty in bridging the length and time scales of macroscale contacts and those of the single asperity interactions they comprise. While the atomic force microscope (AFM) offers a unique ability to probe tribological sur ... [Rev. Sci. Instrum. 84, 055108 (2013)] published Tue May 14, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

A steady-state high-temperature method for measuring thermal conductivity of refractory materials
M. Manzolaro, S. Corradetti, A. Andrighetto, and L. Ferrari A new methodology and an instrumental setup for the thermal conductivity estimation of isotropic bulk graphite and different carbides at high temperatures are presented. The method proposed in this work is based on the direct measurement of temperature and emissivity on the top surface of a sample d ... [Rev. Sci. Instrum. 84, 054902 (2013)] published Tue May 14, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Modified Fabry-Perot interferometer for displacement measurement in ultra large measuring range
Chung-Ping Chang, Pi-Cheng Tung, Lih-Horng Shyu, Yung-Cheng Wang, and Eberhard Manske Laser interferometers have demonstrated outstanding measuring performances for high precision positioning or dimensional measurements in the precision industry, especially in the length measurement. Due to the non-common-optical-path structure, appreciable measurement errors can be easily induced un ... [Rev. Sci. Instrum. 84, 053105 (2013)] published Tue May 14, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Improving the accuracy of optical rotation measurement based on optical null methods by curve-fitting
Zhenhao Yang and Hongzhi Jia An optical rotation measuring system using optical null methods is set up. The system is based on a step-motor rotating stage structure and a modulated laser, which both are controlled by digital signal processor. By introducing a curve-fitting method, the optical rotation angle is obtained from the ... [Rev. Sci. Instrum. 84, 053104 (2013)] published Mon May 13, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Dynamics and rheology of concentrated, finite-Reynolds-number suspensions in a homogeneous shear flow
We present the lubrication-corrected force-coupling method for the simulation of concentrated suspensions under finite inertia. Suspension dynamics are investigated as a function of the particle-scale Reynolds number Re and the bulk volume fraction phi in a homogeneous linear shear flow, in which Re ... [Phys. Fluids 25, 053303 (2013)] published Tue May 14, 2013. (Source: Physics of Fluids)
Source: Physics of Fluids - May 17, 2013 Category: Physics Source Type: research

Momentum transfer in a turbulent, particle-laden Couette flow
David H. Richter and Peter P. Sullivan A point-force model is used to study turbulent momentum transfer in the presence of moderate mass loadings of small (relative to Kolmogorov scales), dense (relative to the carrier phase density) particles. Turbulent Couette flow is simulated via direct numerical simulation, while individual particle ... [Phys. Fluids 25, 053304 (2013)] published Tue May 14, 2013. (Source: Physics of Fluids)
Source: Physics of Fluids - May 17, 2013 Category: Physics Source Type: research

A mapping method for distributive mixing with diffusion: Interplay between chaos and diffusion in time-periodic sine flow
We present an accurate and efficient computational method for solving the advection-diffusion equation in time-periodic chaotic flows. The method uses operator splitting, which allows the advection and diffusion steps to be treated independently. Taking advantage of flow periodicity, the advection s ... [Phys. Fluids 25, 052102 (2013)] published Tue May 14, 2013. (Source: Physics of Fluids)
Source: Physics of Fluids - May 17, 2013 Category: Physics Source Type: research

Analytical solution of the problem of the rise of a Taylor bubble
Yuri B. Zudin In the classical works of Prandtl and Taylor devoted to the analysis of the problem of the rise of a Taylor bubble in a round tube, a solution of the Laplace equation is used, which contains divergent infinite series. The present paper outlines a method for the correct analysis of the mentioned prob ... [Phys. Fluids 25, 053302 (2013)] published Mon May 13, 2013. (Source: Physics of Fluids)
Source: Physics of Fluids - May 17, 2013 Category: Physics Source Type: research

Study of the effects of guide field on Hall reconnection
T. D. Tharp, M. Yamada, H. Ji, E. Lawrence, S. Dorfman et al. The results from guide field studies on the Magnetic Reconnection Experiment (MRX) are compared with results from Hall magnetohydrodynamic (HMHD) reconnection simulation with guide field. The quadrupole field, a signature of two-fluid reconnection at zero guide field, is modified by the presence of ... [Phys. Plasmas 20, 055705 (2013)] published Thu May 16, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research

RFX-mod: A multi-configuration fusion facility for three-dimensional physics studies
P. Piovesan, D. Bonfiglio, F. Auriemma, F. Bonomo, L. Carraro et al. RFX-mod [Sonato et al., Fusion Eng. Des. 66, 161 (2003)] exploits its 192 active coils in both reversed-field pinch (RFP) and tokamak configurations with varying degrees of 3D shaping, providing also a test bed for validating stellarator codes and 3D nonlinear magnetohydrodynamic codes. This makes R ... [Phys. Plasmas 20, 056112 (2013)] published Thu May 16, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research

Collisional effect on the Weibel instability with the bi-Maxwellian distribution function
M. Mahdavi and H. Khanzadeh In this paper, the Coulomb collision effect of electron-ion is investigated based on the equilibrium bi-Maxwellian anisotropic distribution function in dense and unmagnetized plasma. An analytical expression is derived for the real frequency and the growth rate of the Weibel instability for two limi ... [Phys. Plasmas 20, 052114 (2013)] published Wed May 15, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research

Characterization of a novel, short pulse laser-driven neutron source
We present a full characterization of a short pulse laser-driven neutron source. Neutrons are produced by nuclear reactions of laser-driven ions deposited in a secondary target. The emission of neutrons is a superposition of an isotropic component into 4pi and a forward directed, jet-like contributi ... [Phys. Plasmas 20, 056706 (2013)] published Wed May 15, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research

Turbulence and transport suppression scaling with flow shear on the Large Plasma Device
D. A. Schaffner, T. A. Carter, G. D. Rossi, D. S. Guice, J. E. Maggs et al. Continuous control over azimuthal flow and shear in the edge of the Large Plasma Device (LAPD) [W. Gekelman et al., Rev. Sci. Instr. 62, 2875 (1991)] has been achieved using a biasable limiter. This flow control has allowed a careful study of the effect of flow shear on pressure-gradient-driven turb ... [Phys. Plasmas 20, 055907 (2013)] published Wed May 15, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research

First operation with the JET International Thermonuclear Experimental Reactor-like wall
R. Neu, G. Arnoux, M. Beurskens, V. Bobkov, S. Brezinsek et al. To consolidate International Thermonuclear Experimental Reactor (ITER) design choices and prepare for its operation, Joint European Torus (JET) has implemented ITER's plasma facing materials, namely, Be for the main wall and W in the divertor. In addition, protection systems, diagnostics, and the ve ... [Phys. Plasmas 20, 056111 (2013)] published Wed May 15, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research

Nonlinear instability in simulations of Large Plasma Device turbulence
B. Friedman, T. A. Carter, M. V. Umansky, D. Schaffner, and I. Joseph Several simulations of turbulence in the Large Plasma Device (LAPD) [Gekelman et al., Rev. Sci. Instrum. 62, 2875 (1991)] are energetically analyzed and compared with each other and with the experiment. The simulations use the same model, but different axial boundary conditions. They employ either p ... [Phys. Plasmas 20, 055704 (2013)] published Wed May 15, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research

Modeling of current characteristics of segmented Langmuir probe on DEMETER
Nadia Imtiaz, Richard Marchand, and Jean-Pierre Lebreton We model the current characteristics of the DEMETER Segmented Langmuir probe (SLP). The probe is used to measure electron density and temperature in the ionosphere at an altitude of approximately 700 km. It is also used to measure the plasma flow velocity in the satellite frame of reference. The pro ... [Phys. Plasmas 20, 052903 (2013)] published Tue May 14, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research

On nonlinear physics of shear Alfven waves
Liu Chen and Fulvio Zonca Shear Alfven waves (SAW) are electromagnetic oscillations prevalent in laboratory and nature magnetized plasmas. Due to their anisotropic nature, it is well known that the linear wave propagation and dispersiveness of SAW are fundamentally affected by plasma nonuniformities and magnetic field geomet ... [Phys. Plasmas 20, 055402 (2013)] published Tue May 14, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research

Charge-to-mass-ratio-dependent ion heating during magnetic reconnection in the MST RFP
S. T. A. Kumar, A. F. Almagri, D. Craig, D. J. Den Hartog, M. D. Nornberg et al. Temperature evolution during magnetic reconnection has been spectroscopically measured for various ion species in a toroidal magnetized plasma. Measurements are made predominantly in the direction parallel to the equilibrium magnetic field. It is found that the increase in parallel ion temperature d ... [Phys. Plasmas 20, 056501 (2013)] published Tue May 14, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research

Simulations of drift resistive ballooning L-mode turbulence in the edge plasma of the DIII-D tokamak
B. I. Cohen, M. V. Umansky, W. M. Nevins, M. A. Makowski, J. A. Boedo et al. Results from simulations of electromagnetic drift-resistive ballooning turbulence for tokamak edge turbulence in realistic single-null geometry are reported. The calculations are undertaken with the BOUT three-dimensional fluid code that solves Braginskii-based fluid equations [X. Q. Xu and R. H. Co ... [Phys. Plasmas 20, 055906 (2013)] published Tue May 14, 2013. (Source: Physics of Plasmas)
Source: Physics of Plasmas - May 17, 2013 Category: Physics Source Type: research