RSI: General Instruments http://scitation.aip.org/ RSI: General Instruments Smith-chart diagnostics for multi-GHz time-domain-reflectometry dielectric spectroscopy http://link.aip.org/link/?RSI/83/025108/1&agg=rss N. E. Hager, III, R. C. Domszy, and M. R. Tofighi<br/> A time-domain-reflectometry Smith-chart display is demonstrated to be a valuable diagnostic tool in a variety of situations in time-domain-reflectometry dielectric spectroscopy. A relative reflection coefficient is formed by dividing the Laplace transform of the reflected sample transient by the Lap ... [Rev. Sci. Instrum. 83, 025108 (2012)] published Mon Feb 13, 2012. Quartz crystal microbalance based on passive frequency to voltage converter http://link.aip.org/link/?RSI/83/025107/1&agg=rss Ioan Burda and Arthur Tunyagi<br/> In dynamics of evaporation or drying of microdrops from a solid surface, a faster and precise quartz crystal microbalance (QCM) is needed. The fast QCM based on frequency to voltage converter is an attractive and powerful tool in the investigation of the dynamic regime of evaporation to translate th ... [Rev. Sci. Instrum. 83, 025107 (2012)] published Mon Feb 13, 2012. An electrooptic probe to determine internal electric fields in a piezoelectric transformer http://link.aip.org/link/?RSI/83/025106/1&agg=rss Peter Norgard and Scott Kovaleski<br/> A technique using the electrooptic effect to determine the output voltage of an optically clear LiNbO piezoelectric transformer was developed and explored. A brief mathematical description of the solution is provided, as well as experimental data demonstrating a linear response under ac resonant ope ... [Rev. Sci. Instrum. 83, 025106 (2012)] published Thu Feb 9, 2012. Analysis of temporal jitter in a copper vapor laser system http://link.aip.org/link/?RSI/83/025105/1&agg=rss D. Durga Praveen Kumar, L. M. Gantayet, Sunita Singh, A. S. Rawat, Paramjit Rana et al.<br/> Temporal jitter in a magnetic pulse compression based copper vapor laser (CVL) system is analyzed by considering ripple present in the input dc power supply and ripple present in the magnetic core resetting power supply. It is shown that the jitter is a function of the ratio of operating voltage to ... [Rev. Sci. Instrum. 83, 025105 (2012)] published Wed Feb 8, 2012. Normalization schemes for ultrafast x-ray diffraction using a table-top laser-driven plasma source http://link.aip.org/link/?RSI/83/025104/1&agg=rss D. Schick, A. Bojahr, M. Herzog, C. von Korff Schmising, R. Shayduk et al.<br/> We present an experimental setup of a laser-driven x-ray plasma source for femtosecond x-ray diffraction. Different normalization schemes accounting for x-ray source intensity fluctuations are discussed in detail. We apply these schemes to measure the temporal evolution of Bragg peak intensities of ... [Rev. Sci. Instrum. 83, 025104 (2012)] published Tue Feb 7, 2012. Non-contact thrust stand calibration method for repetitively pulsed electric thrusters http://link.aip.org/link/?RSI/83/025103/1&agg=rss Andrea R. Wong, Alexandra Toftul, Kurt A. Polzin, and J. Boise Pearson<br/> A thrust stand calibration technique for use in testing repetitively pulsed electric thrusters for in-space propulsion has been developed and tested using a modified hanging pendulum thrust stand. In the implementation of this technique, current pulses are applied to a solenoid to produce a pulsed m ... [Rev. Sci. Instrum. 83, 025103 (2012)] published Tue Feb 7, 2012. Compact cryogenic source of periodic hydrogen and argon droplet beams for relativistic laser-plasma generation http://link.aip.org/link/?RSI/83/025102/1&agg=rss R. A. Costa Fraga, A. Kalinin, M. Kuhnel, D. C. Hochhaus, A. Schottelius et al.<br/> We present a cryogenic source of periodic streams of micrometer-sized hydrogen and argon droplets as ideal mass-limited target systems for fundamental intense laser-driven plasma applications. The highly compact design combined with a high temporal and spatial droplet stability makes our injector id ... [Rev. Sci. Instrum. 83, 025102 (2012)] published Thu Feb 2, 2012. High temperature Seebeck coefficient and resistance measurement system for thermoelectric materials in the thin disk geometry http://link.aip.org/link/?RSI/83/025101/1&agg=rss P. H. Michael Bottger, E. Flage-Larsen, O. B. Karlsen, and Terje G. Finstad<br/> A versatile apparatus to measure the cross-plane Seebeck coefficient and the resistivity of bulk samples shaped as disks or thin plates, over a temperature range of 300 K620 K with possible extension to higher temperatures, is presented. It is constructed from readily available equipment and instrum ... [Rev. Sci. Instrum. 83, 025101 (2012)] published Thu Feb 2, 2012. Design, construction, and calibration of an isothermal titration calorimeter and its application in the study of the adsorption of phenolic compounds http://link.aip.org/link/?RSI/83/015117/1&agg=rss Juan Carlos Moreno-Pirajan and Liliana Giraldo<br/> An isothermal calorimetric titration was designed and built, and some of the results obtained are presented here. For this purpose, a Calvet heat-conducting microcalorimeter was developed and connected to a titration unit built for this experiment to record titration thermograms. The microcalorimete ... [Rev. Sci. Instrum. 83, 015117 (2012)] published Tue Jan 31, 2012. A tapered undulator experiment at the ELBE far infrared hybrid-resonator oscillator free electron laser http://link.aip.org/link/?RSI/83/015116/1&agg=rss V. Asgekar, U. Lehnert, and P. Michel<br/> A tapered undulator experiment was carried out at the ELBE far-infrared free electron laser (FEL). The oscillator FEL makes use of a hybrid optical resonator. The main motivation was to see whether the presence of a dispersive medium in the form of a waveguide in the resonator has any effect on the ... [Rev. Sci. Instrum. 83, 015116 (2012)] published Tue Jan 31, 2012. Design and application of a new series of gallbladder endoscopes that facilitate gallstone removal without gallbladder excision http://link.aip.org/link/?RSI/83/015115/1&agg=rss Tie Qiao, Wan-Chao Huang, Xiao-Bing Luo, and Yang-De Zhang<br/> In recent years, some Chinese doctors have proposed a new concept, gallstone removal without gallbladder excision, along with transition of the medical model. As there is no specialized endoscope for gallstone removal without gallbladder excision, we designed and produced a new series of gallbladder ... [Rev. Sci. Instrum. 83, 015115 (2012)] published Tue Jan 31, 2012. Design and operation of the wide angular-range chopper spectrometer ARCS at the Spallation Neutron Source http://link.aip.org/link/?RSI/83/015114/1&agg=rss D. L. Abernathy, M. B. Stone, M. J. Loguillo, M. S. Lucas, O. Delaire et al.<br/> The wide angular-range chopper spectrometer ARCS at the Spallation Neutron Source (SNS) is optimized to provide a high neutron flux at the sample position with a large solid angle of detector coverage. The instrument incorporates modern neutron instrumentation, such as an elliptically focused neutro ... [Rev. Sci. Instrum. 83, 015114 (2012)] published Tue Jan 31, 2012. A new quasi-steady method to measure gas permeability of weakly permeable porous media http://link.aip.org/link/?RSI/83/015113/1&agg=rss Yves Jannot and Didier Lasseux<br/> A new quasi-steady method for the determination of the apparent gas permeability of porous materials is presented in this paper along with the corresponding interpretative physical model derived from the unsteady flow equations. This method is mainly dedicated to the measurement of very low permeabi ... [Rev. Sci. Instrum. 83, 015113 (2012)] published Mon Jan 30, 2012. Glow-to-arc transition events in H-Ar direct current pulsed plasma: Automated measurement of current and voltage http://link.aip.org/link/?RSI/83/015112/1&agg=rss Luciano A. Mendes, Marcio Mafra, and Jhonatam C. Rodrigues<br/> The glow-to-arc transition phenomena (arcing) observed in plasma reactors used in materials processing was studied through the arcs characteristic current and voltage waveforms. In order to capture these arcs signals, a LABVIEW based automated instrumentation system (ARCVIEW) was developed, includin ... [Rev. Sci. Instrum. 83, 015112 (2012)] published Mon Jan 30, 2012. Increased bandwidth for dielectric spectroscopy of proteins through electrode surface preparation http://link.aip.org/link/?RSI/83/015110/1&agg=rss Brett L. Mellor, Efren Cruz Cortes, Shiul Khadka, and Brian A. Mazzeo<br/> Dielectric spectroscopy measurements of liquids are often limited by electrode polarization. The influence of surface polishing and deposition of the conducting polymer polypyrrole/polystyrenesulfonate (PPy/PSS) on the polarization impedance is investigated. A quantitative description of the electro ... [Rev. Sci. Instrum. 83, 015110 (2012)] published Wed Jan 25, 2012. A new borehole wire extensometer with high accuracy and stability for observation of local geodynamic processes http://link.aip.org/link/?RSI/83/015109/1&agg=rss Gy. Mentes<br/> Very stable and reliable instruments with high accuracy are required in field measurements for continuous monitoring local geodynamic processes, such as tectonic movements, ground motions in landslide prone areas, etc. A sensitive borehole wire extensometer with low energy consumption was developed ... [Rev. Sci. Instrum. 83, 015109 (2012)] published Fri Jan 13, 2012. Development of roll-to-roll hot embossing system with induction heater for micro fabrication http://link.aip.org/link/?RSI/83/015108/1&agg=rss Dongwon Yun, Youngsu Son, Jinho Kyung, Heechang Park, Chanhun Park et al.<br/> In this paper, a hot embossing heating roll with induction heater inside the roll is proposed. The induction heating coil is installed inside a roll that is used as a heating roll of a roll-to-roll (R2R) hot embossing apparatus. Using an inside installed heating coil gives the roll-to-roll hot embos ... [Rev. Sci. Instrum. 83, 015108 (2012)] published Wed Jan 11, 2012. Continual in-plane displacement measurement with temporal wavelet transform speckle pattern interferometry http://link.aip.org/link/?RSI/83/015107/1&agg=rss Zhan Gao, Yan Deng, Yiting Duan, Zhifeng Zhang, Cheng Wei et al.<br/> A heterodyne temporal speckle pattern interferometer that measures the in-plane displacement dynamically has been built. The object is displaced in its plane continuously and the frequency-modulated output signals with a carrier frequency are recorded by a CCD camera. The displacement information is ... [Rev. Sci. Instrum. 83, 015107 (2012)] published Tue Jan 10, 2012. High pressure rheometer for in situ formation and characterization of methane hydrates http://link.aip.org/link/?RSI/83/015106/1&agg=rss Eric B. Webb, Patrick J. Rensing, Carolyn A. Koh, E. Dendy Sloan, Amadeu K. Sum et al.<br/> We present a novel setup for a high pressure rheometer operating with concentric cylinders geometry for in situ studies of hydrate formation and rheological characterization. The apparatus uses an external high pressure mixing cell to saturate water-in-oil emulsions with methane gas. The capability ... [Rev. Sci. Instrum. 83, 015106 (2012)] published Tue Jan 10, 2012. A torsion balance for impulse and thrust measurements of micro-Newton thrusters http://link.aip.org/link/?RSI/83/015105/1&agg=rss Yuan-Xia Yang, Liang-Cheng Tu, Shan-Qing Yang, and Jun Luo<br/> This paper reports the performance of a torsion-type thrust stand suitable for studies of micro-Newton thrusters, which is developed for ground testing the micro-Newton thruster in Chinese Test of the Equivalence Principle with Optical readout space mission. By virtue of specially suspending design ... [Rev. Sci. Instrum. 83, 015105 (2012)] published Mon Jan 9, 2012. Four degree of freedom liquid dispenser for direct write capillary self-assembly with sub-nanoliter precision http://link.aip.org/link/?RSI/83/015104/1&agg=rss Justin Beroz, Mostafa Bedewy, Michael Reinker, Vipul Chhajer, Shorya Awtar et al.<br/> Capillary forces provide a ubiquitous means of organizing micro- and nanoscale structures on substrates. In order to investigate the mechanism of capillary self-assembly and to fabricate complex ordered structures, precise control of the meniscus shape is needed. We present a precision instrument th ... [Rev. Sci. Instrum. 83, 015104 (2012)] published Mon Jan 9, 2012.