Heikki Seppa
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Explore the profile of Heikki Seppa including associated specialties, affiliations and a list of published articles.
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20
Citations
133
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Recent Articles
11.
Tallavaara M, Luoto M, Korhonen N, Jarvinen H, Seppa H
Proc Natl Acad Sci U S A
. 2015 Jun;
112(27):8232-7.
PMID: 26100880
The severe cooling and the expansion of the ice sheets during the Last Glacial Maximum (LGM), 27,000-19,000 y ago (27-19 ky ago) had a major impact on plant and animal...
12.
Heiri O, Brooks S, Renssen H, Bedford A, Hazekamp M, Ilyashuk B, et al.
Nat Commun
. 2014 Sep;
5:4914.
PMID: 25208610
Comparisons of climate model hindcasts with independent proxy data are essential for assessing model performance in non-analogue situations. However, standardized palaeoclimate data sets for assessing the spatial pattern of past...
13.
Fang K, Chen F, Sen A, Davi N, Huang W, Li J, et al.
PLoS One
. 2014 Aug;
9(8):e102751.
PMID: 25119567
Hydroclimate variations since 1300 in central and monsoonal Asia and their interplay on interannual and interdecadal timescales are investigated using the tree-ring based Palmer Drought Severity Index (PDSI) reconstructions. Both...
14.
Lahteenmaki P, Vesterinen V, Hassel J, Seppa H, Hakonen P
Sci Rep
. 2012 Feb;
2:276.
PMID: 22355788
The fundamental noise limit of a phase-preserving amplifier at frequency [Formula: see text] is the standard quantum limit [Formula: see text]. In the microwave range, the best candidates have been...
15.
Allen M, Aronniemi M, Mattila T, Alastalo A, Ojanpera K, Suhonen M, et al.
Nanotechnology
. 2011 Aug;
19(17):175201.
PMID: 21825662
A method for sintering nanoparticles by applying voltage is presented. This electrical sintering method is demonstrated using silver nanoparticle structures ink-jet-printed onto temperature-sensitive photopaper. The conductivity of the printed nanoparticle...
16.
Gracia-Espino E, Sala G, Pino F, Halonen N, Luomahaara J, Maklin J, et al.
ACS Nano
. 2010 May;
4(6):3318-24.
PMID: 20481513
The electrical properties of random networks of single-wall carbon nanotubes (SWNTs) obtained by inkjet printing are studied. Water-based stable inks of functionalized SWNTs (carboxylic acid, amide, poly(ethylene glycol), and polyaminobenzene...
17.
Viikari V, Seppa H, Mattila T, Alastalo A
IEEE Trans Ultrason Ferroelectr Freq Control
. 2010 Apr;
57(4):785-91.
PMID: 20378440
This paper presents a passive wireless resonating sensor that is based on a ferroelectric varactor. The sensor replies with its data at an intermodulation frequency when a reader device illuminates...
18.
Viikari V, Kokkonen K, Meltaus J, Seppa H
IEEE Trans Ultrason Ferroelectr Freq Control
. 2009 Jul;
56(6):1277-81.
PMID: 19574136
This correspondence presents an estimator for reflective delay line-type surface acoustic wave (SAW) sensors. The estimator is derived from an analytical model and its range of validity is discussed. The...
19.
Pehrsson A, Gunnar T, Engblom C, Seppa H, Jama A, Lillsunde P
Forensic Sci Int
. 2007 Jul;
175(2-3):140-8.
PMID: 17640837
Drugged drivers pose a serious threat to other people in traffic as well as to themselves. Reliable oral fluid screening devices for on-site screening of drugged drivers would be both...
20.
Niskanen A, Pekola J, Seppa H
Phys Rev Lett
. 2003 Nov;
91(17):177003.
PMID: 14611371
We introduce a Cooper pair "sluice" for the implementation of a frequency-locked current source. The device consists of two mesoscopic SQUIDs and of a single superconducting island with a gate....