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| Title |
Radioastron space VLBI mission |
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| Year |
2007 |
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no |
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RPLAB @ s @ RADIOASTRON_site |
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394 |
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| Title |
Проект Радиоастрон |
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2007 |
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russian |
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no |
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RPLAB @ s @ RADIOASTRON_site_rus |
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393 |
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| Title |
Проект Миллиметрон |
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2007 |
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russian |
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no |
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RPLAB @ s @ MILLIMETRON_site_rus |
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395 |
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Atacama large millimeter/submillimeter array |
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2007 |
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no |
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RPLAB @ s @ ALMA_proj |
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403 |
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SOFIA – stratospheric observatory for infrared astronomy |
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2007 |
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no |
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RPLAB @ s @ SOFIA_proj |
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404 |
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| Title |
SRON-TELIS |
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2007 |
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no |
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RPLAB @ s @ TELIS_proj |
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405 |
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ГОСТ 3.1119-83. ЕСТД. Общие требования к комплектности и оформлению комплектов документов на единичные технологические процессы |
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Book Whole |
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2007 |
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| Keywords |
gost, detproj |
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no |
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Serial |
869 |
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| Author |
Bell, M.; Kaurova, N.; Divochiy, A.; Gol'tsman, G.; Bird, J.; Sergeev, A.; Verevkin, A. |
| Title |
On the nature of resistive transition in disordered superconducting nanowires |
Type |
Journal Article |
| Year |
2007 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
| Volume |
17 |
Issue |
2 |
Pages |
267-270 |
| Keywords |
SSPD, SNSPD |
| Abstract |
Hot-electron single-photon counters based on long superconducting nanowires are starting to become popular in optical and infrared technologies due to their ultimately high sensitivity and very high response speed. We investigate intrinsic fluctuations in long NbN nanowires in the temperature range of 4.2 K-20 K, i.e. above and below the superconducting transition. These fluctuations are responsible for fluctuation resistivity and also determine the noise in practical devices. Measurements of the fluctuation resistivity were performed at low current densities and also in external magnetic fields up to 5 T. Above the BCS critical temperature T co the resistivity is well described by the Aslamazov-Larkin (AL) theory for two-dimensional samples. Below T co the measured resistivity is in excellent agreement with the Langer-Ambegaokar-McCumber-Halperin (LAMH) theory developed for one-dimensional superconductors. Despite that our nanowires of 100 nm width are two-dimensional with respect to the coherence length, our analysis shows that at relatively low current densities the one-dimensional LAMH mechanism based on thermally induced phase slip centers dominates over the two-dimensional mechanism related to unbinding of vortex-antivortex pairs below the Berezinskii-Kosterlitz-Thouless transition. |
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| ISSN |
1051-8223 |
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no |
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Serial |
1247 |
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| Author |
Bell, M.; Sergeev, A.; Mitin, V.; Bird, J.; Verevkin, A.; Gol'tsman, G. |
| Title |
One-dimensional resistive states in quasi-two-dimensional superconductors |
Type |
Journal Article |
| Year |
2007 |
Publication |
arXiv:0709.0709v1 [cond-mat.supr-con] |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
1-11 |
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| Abstract |
We investigate competition between one- and two-dimensional topological excitations – phase slips and vortices – in formation of resistive states in quasi-two-dimensional superconductors in a wide temperature range below the mean-field transition temperature T(C0). The widths w = 100 nm of our ultrathin NbN samples is substantially larger than the Ginzburg-Landau coherence length ξ = 4nm and the fluctuation resistivity above T(C0) has a two-dimensional character. However, our data shows that the resistivity below T(C0) is produced by one-dimensional excitations, – thermally activated phase slip strips (PSSs) overlapping the sample cross-section. We also determine the scaling phase diagram, which shows that even in wider samples the PSS contribution dominates over vortices in a substantial region of current/temperature variations. Measuring the resistivity within seven orders of magnitude, we find that the quantum phase slips can only be essential below this level. |
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no |
| Call Number |
RPLAB @ atomics90 @ |
Serial |
948 |
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| Author |
Bell, M.; Sergeev, A.; Mitin, V.; Bird, J.; Verevkin, A.; Gol’tsman, G. |
| Title |
One-dimensional resistive states in quasi-two-dimensional superconductors: Experiment and theory |
Type |
Journal Article |
| Year |
2007 |
Publication |
Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
76 |
Issue |
9 |
Pages |
094521 (1 to 5) |
| Keywords |
uasi-two-dimensional superconductors, NbN |
| Abstract |
We investigate competition between one- and two-dimensional topological excitations—phase slips and vortices—in the formation of resistive states in quasi-two-dimensional superconductors in a wide temperature range below the mean-field transition temperature TC0. The widths w=100nm of our ultrathin NbN samples are substantially larger than the Ginzburg-Landau coherence length ξ=4nm, and the fluctuation resistivity above TC0 has a two-dimensional character. However, our data show that the resistivity below TC0 is produced by one-dimensional excitations—thermally activated phase slip strips (PSSs) overlapping the sample cross section. We also determine the scaling phase diagram, which shows that even in wider samples the PSS contribution dominates over vortices in a substantial region of current and/or temperature variations. Measuring the resistivity within 7 orders of magnitude, we find that the quantum phase slips can only be essential below this level. |
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Edition |
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| ISSN |
1098-0121 |
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no |
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Serial |
1423 |
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| Author |
Buyakas, V. I.; Rybakova, A. G. |
| Title |
The Millimetron project: the unit of high-precision deployment of a space mirror |
Type |
Conference Article |
| Year |
2007 |
Publication |
Radioastronomical Tools and Techniques |
Abbreviated Journal |
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Issue |
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Pages |
127 |
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Kardashev, N. S.; Dagkesamanskii, S. A. |
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no |
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RPLAB @ s @ MILLIMETRON_Buyakas_2007 |
Serial |
399 |
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| Author |
Cao, Aiqin; Jiang, L.; Chen, S.H.; Antipov, S.V.; Shi, S.C. |
| Title |
IF gain bandwidth of a quasi-optical NbN superconducting HEB mixer |
Type |
Conference Article |
| Year |
2007 |
Publication |
Proc. International conference on microwave and millimeter wave technology |
Abbreviated Journal |
Proc. ICMMT |
| Volume |
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Issue |
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Pages |
1-3 |
| Keywords |
HEB, mixer, gain bandwidth |
| Abstract |
In this paper, the intermediate frequency (IF) gain bandwidth of a quasi-optical NbN superconducting hot-electron bolometer (HEB) mixer is investigated at 500 GHz with an IF system incorporating with a frequency down-converting scheme which is able to sweep the IF signal in a frequency range of 0.3-4 GHz. The IF gain bandwidth of the device is measured to be 1.5 GHz when it is biased at a voltage of the minimum noise temperature, and becomes larger when the bias voltage increases. |
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Place of Publication |
Builin |
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no |
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RPLAB @ lobanovyury @ |
Serial |
575 |
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| Author |
Cherednichenko, S.; Drakinskiy, V.; Baubert, J.; Krieg, J.-M.; Voronov, B.; Gol'tsman, G.; Desmaris, V. |
| Title |
Gain bandwidth of NbN hot-electron bolometer terahertz mixers on 1.5 μm Si3N4 / SiO2 membranes |
Type |
Journal Article |
| Year |
2007 |
Publication |
J. Appl. Phys. |
Abbreviated Journal |
J. Appl. Phys. |
| Volume |
101 |
Issue |
12 |
Pages |
124508 (1 to 6) |
| Keywords |
HEB, mixer, membrane |
| Abstract |
The gain bandwidth of NbN hot-electron bolometer terahertz mixers on electrically thin Si3N4/SiO2 membranes was experimentally investigated and compared with that of HEB mixers on bulk substrates. A gain bandwidth of 3.5 GHz is achieved on bulk silicon, whereas the gain bandwidth is reduced down to 0.6–0.9 GHz for mixers on 1.5 μm Si3N4/SiO2 membranes. We show that application of a MgO buffer layer on the membrane extends the gain bandwidth to 3 GHz. The experimental data were analyzed using the film-substrate acoustic mismatch approach. |
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0021-8979 |
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no |
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560 |
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Cherednichenko, S.; Drakinskiy, V.; Baubert, J.; Lecomte, B.; Dauplay, F.; Krieg, J.-M.; Delorme, Y.; Feret, A.; Hübers, H.-W.; Semenov, A. D.; Gol’tsman, G. N. |
| Title |
2.5 THz multipixel heterodyne receiver based on NbN HEB mixers |
Type |
Abstract |
| Year |
2007 |
Publication |
Proc. 18th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 18th Int. Symp. Space Terahertz Technol. |
| Volume |
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Issue |
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Pages |
112 |
| Keywords |
NbN HEB mixers |
| Abstract |
A 16 pixel heterodyne receiver for 2.5 THz has been developed based on NbN superconducting hot-electron bolometer (HEB) mixers. The receiver uses a quasioptical RF coupling approach where HEB mixers are integrated into double dipole antennas on 1.5μm thick Si3N4 / SiO2 membranes. Spherical mirrors (one per pixel) and backshort distance from the antenna have been used to design the output mixer beam profile. The camera design allows all 16 pixel IF readout in parallel. Measurements of the mixers sensitivity and the input RF band are presented, and compared against calculations. |
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no |
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1419 |
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| Author |
Cherednichenko, Sergey; Drakinskiy, Vladimir; Berg, Therese; Kollberg, Erik L.; Angelov, Iltcho |
| Title |
The direct detection effect in the hot-electron bolometer mixer sensitivity calibration |
Type |
Journal Article |
| Year |
2007 |
Publication |
IEEE Trans. Microw. Theory Techn. |
Abbreviated Journal |
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| Volume |
55 |
Issue |
3 |
Pages |
504-510 |
| Keywords |
HEB, mixer, direct detection effect |
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0018-9480 |
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no |
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RPLAB @ lobanovyury @ |
Serial |
555 |
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