Search Results - "Nissila, J."

Driving a low critical current Josephson junction array with a mode-locked laser by Nissilä, J., Fordell, T., Kohopää, K., Mykkänen, E., Immonen, P., Jabdaraghi, R. N., Bardalen, E., Kieler, O., Karlsen, B., Øhlckers, P. A., Behr, R., Manninen, A. J., Govenius, J., Kemppinen, A.

“…We report proof-of-concept experiments on an optically driven Josephson voltage standard based on a mode-locked laser (MLL), a time-division multiplexer, and a…”
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Performance analysis of a digital positron lifetime spectrometer by Nissilä, J., Rytsölä, K., Aavikko, R., Laakso, A., Saarinen, K., Hautojärvi, P.

“…A digital positron lifetime spectrometer has been set up and tested comprehensively. The system consists of a fast commercial digitizer connected to a…”
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Aerobic fitness, energy balance, and body mass index are associated with training load assessed by activity energy expenditure by Tanskanen, M., Uusitalo, A. L. T., Häkkinen, K., Nissilä, J., Santtila, M., Westerterp, K. R., Kyröläinen, H.

“…The present study examined whether activity energy expenditure related to body mass (AEE/kg) is associated with maximal aerobic fitness (VO2max), energy…”
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A quantum voltmeter for precision AC measurements by Lee, J., Nissila, J., Katkov, A., Behr, R.

“…An AC quantum voltmeter has been developed for precision AC voltage measurements into the kHz range. A special sub-sampling technique is used such that no…”
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Stable arbitrary waveform generator as a transfer standard for ADC calibration by Nissila, J., Sira, M., Lee, J., Ozturk, T., Arifovic, M., Diaz de Aguilar, J., Lapuh, R., Behr, R.

“…This paper describes a feasibility study of using a stable semiconductor digital-to-analog converter (DAC) based arbitrary waveform generator in audio…”
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Design and performance of an advanced metrology building for MIKES by Lassila, A., Kari, M., Koivula, H., Koivula, U., Kortström, J., Leinonen, E., Manninen, J., Manssila, J., Mansten, T., Meriläinen, T., Muttilainen, J., Nissilä, J., Nyblom, R., Riski, K., Sarilo, J., Isotalo, H.

“…Fundamental metrology is closely linked to the development of science and needs good facilities to achieve low measurement uncertainty in demanding…”
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Influence of harmonics on AC measurements using a quantum voltmeter by Katkov, A., Gubler, G., Lee, J., Behr, R., Nissila, J.

“…This paper describes the investigation of the influence of harmonics in a signal that is measured by using an AC quantum voltmeter. Equations for parameters of…”
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Digital measurement of positron lifetime by Rytsölä, K, Nissilä, J, Kokkonen, J, Laakso, A, Aavikko, R, Saarinen, K

“…A prototype of a digital positron lifetime apparatus is presented. We demonstrate that direct digitizing of detector pulses and subsequent simple analysis with…”
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A precise two-channel digitally synthesized AC voltage source for impedance metrology by Nissila, J., Ojasalo, K., Kampik, M., Kaasalainen, J., Maisi, V., Casserly, M., Overney, F., Christensen, A., Callegaro, L., D'Elia, V., Tran, N. T. M., Pourdanesh, F., Ortolano, M., Kim, D. B., Penttila, J., Roschier, L.

“…A two-channel AC voltage source based on digital synthesis is reported. We present measurement results of some of the key properties at 1 kHz with applications…”
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The influence of Mg doping on the formation of Ga vacancies and negative ions in GaN bulk crystals by Saarinen, K., Nissilä, J., Hautojärvi, P., Likonen, J., Suski, T., Grzegory, I., Lucznik, B., Porowski, S.

“…Gallium vacancies and negative ions are observed in GaN bulk crystals by applying positron lifetime spectroscopy. The concentration of Ga vacancies decreases…”
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Identification of Vacancy-Impurity Complexes in Highly n -Type Si by Saarinen, K., Nissilä, J., Kauppinen, H., Hakala, M., Puska, M. J., Hautojärvi, P., Corbel, C.

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Millimeter Wave Engineering of Distributed Josephson Junction Arrays by Hassel, J.., Gronberg, L.., Helisto, P.., Seppa, H.., Nissila, J.., Manninen, A..

“…Josephson arrays are suitable for applications involving mm waves. Realizations of such systems typically involve structures that are large compared to the…”
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A quantum standard for sampled electrical measurements - main goals and first results of the EMRP project Q-WAVE by Kohlmann, J., Behr, R., Kieler, O., Diaz de Aguilar Rois, J., Sira, M., Sosso, A., Trinchera, B., Gran, J., Malmbekk, H., Jeanneret, B., Overney, F., Nissila, J., Lehtonen, T., Ireland, J., Williams, J., Lapuh, R., Voljc, B., Bergsten, T., Eklund, G., Coskun Ozturk, T., Houtzager, E., van den Brom, H. E., Ohlckers, P.

“…Josephson voltage standards are well established for use at dc and low-frequency ac voltages. The increasing demand i) to provide traceability for arbitrary…”
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AC voltage standard based on a programmable SIS array by Helisto, P., Nissila, J., Ojasalo, K., Penttila, J.S., Seppa, H.

“…An AC voltage standard is being developed based on phase sensitive detection of the amplitude of the fundamental frequency component of the output of a…”
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Stimulated power generation in ES-SIS junction arrays by Hassel, J., Helisto, P., Gronberg, L., Seppa, H., Nissila, J., Kemppinen, A.

“…We present experimental results on new programmable Josephson voltage standards based on frequency dependently damped superconductor-insulator-superconductor…”
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Optical and electrical properties of Be doped GaN bulk crystals by Suski, T., Litwin-Staszewska, E., Perlin, P., Wisniewski, P., Teisseyre, H., Grzegory, I., Bockowski, M., Porowski, S., Saarinen, K., Nissilä, J.

“…Highly resistive GaN : Be was obtained by means of synthesis of Ga+Be with atomic nitrogen under high nitrogen pressure. Activation energy of resistivity is…”
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Thermal-Conductivity Measurement of Thermoelectric Materials Using 3ω Method by Hahtela, O., Ruoho, M., Mykkänen, E., Ojasalo, K., Nissilä, J., Manninen, A., Heinonen, M.

“…In this work, a measurement system for high-temperature thermal-conductivity measurements has been designed, constructed, and characterized. The system is…”
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Realization of a square-wave voltage with externally-shunted SIS Josephson junction arrays for a quantum AC voltage standard by Nissila, J., Kemppinen, A., Ojasalo, K., Hassel, J., Manninen, A., Helisto, P., Seppa, H.

“…A quantum-based ac voltage standard operating from about 1 Hz up to 10 kHz at 1 V is being developed. The standard is based on relating the output of a stable…”
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Observation of Native Ga Vacancies in GaN by Positron Annihilation by Saarinen, K., Laine, T., Kuisma, S., Nissilä, J., Hautojärvi, P., Dobrzynski, L., Baranowski, J. M., Pakula, K., Stepniewski, R., Wojdak, M., Wysmolek, A., Suski, T., Leszczynski, M., Grzegory, I., Porowski, S.

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Formation of vacancy-impurity complexes by kinetic processes in highly As-doped Si by Ranki, V, Nissilä, J, Saarinen, K

“…Positron annihilation experiments have been applied to verify the formation mechanism of electrically inactive vacancy-impurity clusters in highly n-type Si…”
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