Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Christian Freier"'
Publikováno v:
BMC Family Practice, Vol 21, Iss 1, Pp 1-11 (2020)
Abstract Background An increasing prevalence of having survived a myocardial infarction increases the importance of medical secondary prevention. Although preventive medication reduces mortality, prescribing and adherence are known to be frequently i
Externí odkaz:
https://doaj.org/article/708002b45deb4e61aa4cc55745e3b389
Autor:
Bernt-Peter Robra, Wolfram J. Herrmann, Raven Ulrich, Tobias Pischon, Christian Freier, Christoph Heintze
Publikováno v:
International Journal of Cardiology. 300:20-26
Background After myocardial infarction, guidelines recommend pharmaceutical treatment with a combination of five different types of drugs for prevention in patients. However, studies from different countries have shown that this goal is not achieved
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db8f5c7b4688d1bf756f35fb548f6b52
https://doi.org/10.1016/j.ijcard.2019.07.050
https://doi.org/10.1016/j.ijcard.2019.07.050
Publikováno v:
Applied Optics. 61:4543
This paper describes a filled-aperture coherent beam combining (CBC) system based on locking of optical coherence via single-detector electronic-frequency tagging (LOCSET). The sensing and control architecture is implemented using a field-programmabl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9eb1d726d05b862493a993c30a970f41
https://doi.org/10.1364/ao.456360
https://doi.org/10.1364/ao.456360
Autor:
Vladimir Schkolnik, Hu Qingqing, Markus Krutzik, Christian Freier, Achim Peters, Jun Yang, B. Leykauf
Precisely evaluating the systematic error induced by the quadratic Zeeman effect is important for developing atom interferometer gravimeters aiming at an accuracy in the regime ( ). This paper reports on the experimental investigation of Raman spectr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::953d2b9f39cbaf0fafb0eb18cbad9db3
http://arxiv.org/abs/1805.05159
http://arxiv.org/abs/1805.05159
Autor:
B. Leykauf, Markus Krutzik, Yuan Sun, Christian Freier, Vladimir Schkolnik, Achim Peters, Jun Yang, Hu Qingqing
Publikováno v:
Physical Review A. 97
We present the derivation of the frequency-dependent scalar, vector, and tensor dynamical polarizabilities for the two hyperfine levels of the $^{87}\mathrm{Rb}$ atom $5s$ ground state. Based on the characterization of the dynamical polarizabilities,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5ee957c765ad6d5d5f765d85c9415c9f
https://doi.org/10.1103/physreva.97.013424
https://doi.org/10.1103/physreva.97.013424
Publikováno v:
Applied Physics B. 113:49-55
We present the compact Gravimetric Atom Interferometer (GAIN), based on laser-cooled 87Rb atoms, and discuss its first measurements of the local gravitational acceleration. In this context, we also describe an active vibration isolation system and a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::010b90c7fa1db90c6858773ac7d21d8c
https://doi.org/10.1007/s00340-013-5413-6
https://doi.org/10.1007/s00340-013-5413-6
Autor:
Christian Freier, Achim Peters, Hartmut Wziontek, Vladimir Schkolnik, Jürgen Müller, B. Leykauf, Hans-Georg Scherneck, M. Hauth, Manuel Schilling
Publikováno v:
Journal of Physics: Conference Series 723 (2016), Nr. 1
Changes of surface gravity on Earth are of great interest in geodesy, earth sciences and natural resource exploration. They are indicative of Earth system's mass redistributions and vertical surface motion, and are usually measured with falling corne
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70eacff785e975fb531e0deb496e70de
Publikováno v:
Gyroscopy and Navigation. 2:170-177
We present the new mobile and robust gravimeter GAIN (Gravimetric Atom Interferometer), which is based on interfering ensembles of laser cooled 87Rb atoms in an atomic fountain configuration. With a targeted accuracy of a few parts in 1010 for the me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1fd5dc372393c5b26687105839ef2c1c
https://doi.org/10.1134/s2075108711030102
https://doi.org/10.1134/s2075108711030102
Wavefront aberrations are one of the largest uncertainty factors in present atom interferometers. We present a detailed numerical and experimental analysis of this effect based on measured aberrations from optical windows. By placing windows into the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::476fbd344bf542e9ffdc9139b067fafd
http://arxiv.org/abs/1411.7914
http://arxiv.org/abs/1411.7914
Publikováno v:
Scopus-Elsevier
We present the compact and mobile gravimeter GAIN designed for high-precision on site measurements of the local gravitational acceleration. We discuss the latest gravity measurements where GAIN has achieved a sensitivity of 3×10-8 g/√Hz.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c7af73c76ca97cb0c0d4374cf1f986f
https://doi.org/10.1364/ls.2013.lm4h.2
https://doi.org/10.1364/ls.2013.lm4h.2