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Wyszukujesz frazę "Shaffer, J." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Quantum Control of Motional States of Neutral Atoms: Exploiting the External Degrees of Freedom
Autorzy:
Bigelow, N. P.
Chałupczak, W.
Ejnisman, R.
Pu, H.
Rudy, P.
Shaffer, J.
Powiązania:
https://bibliotekanauki.pl/articles/1968501.pdf
Data publikacji:
1998-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.Fi
32.80.Pj
42.50.Dv
Opis:
As research in quantum optics has advanced, so too has our ability to precisely tailor the quantum state of a system. Indeed, techniques for quantum state preparation have become sufficiently advanced that an entire subfield has appeared which has been given the name "quantum control". Parallel to these advances have been other striking developments in quantum optics, in particular, laser cooling and trapping of neutral atoms. In this paper we describe some of the recent advancements in laser cooling, particularly in our laboratories, and point out that laser cooling and trapping is also realizing an important form of quantum control. In laser cooling, instead of exercising control over the internal quantum state of an atom or molecule or a laser field, we are instead controlling a complementary set of degrees of freedom: those of the external coordinates of the atom.
Źródło:
Acta Physica Polonica A; 1998, 93, 1; 11-29
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser Cooling: Beyond One Field and One Dimension
Autorzy:
Bigelow, N. P.
Cas, T.
Pu, H.
Korn, J.
Shaffer, J.
Hemmer, P. R.
Katz, D. P.
Shahriar, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/1931374.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Pj
Opis:
We describe recent experimental and theoretical results which show that the light pressure force for an atom with more than two levels, in a field with more than one frequency or which is studied in more than one dimension can display striking new features. The importance of these results lies in the fact that they cannot be explained in terms of a two-level, a monochromatic or a one-dimensional theory.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 29-40
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure drop of filtering facepiece respirators: How low should we go?
Autorzy:
Kim, Jung-Hyun
Roberge, Raymond J.
Powell, Jeffrey B.
Shaffer, Ronald E.
Ylitalo, Caroline M.
Sebastian, John M.
Powiązania:
https://bibliotekanauki.pl/articles/2177016.pdf
Data publikacji:
2015-02-24
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
respirator
filter
oral breathing
nasal breathing
Opis:
Introduction This study was undertaken to determine the mean peak filter resistance to airflow (R filter) encountered by subjects while wearing prototype filtering facepiece respirators (PRs) with low Rfilter during nasal and oral breathing at sedentary and low-moderate work rates. Material and methods In-line pressure transducer measurements of mean R filter across PRs with nominal R filter of 29.4 Pa, 58.8 Pa and 88.2 Pa (measured at 85 l/min constant airflow) were obtained during nasal and oral breathing at sedentary and low-moderate work rates for 10 subjects. Results The mean R filter for the 29.4 PR was significantly lower than the other 2 PRs (p < 0.000), but there were no significant differences in mean R filter between the PRs with 58.8 and 88.2 Pa filter resistance (p > 0.05). The mean R filter was greater for oral versus nasal breathing and for exercise compared to sedentary activity (p < 0.001). Conclusions Mean oral and nasal R filter for all 3 PRs was at, or below, the minimal threshold level for detection of inspiratory resistance (the 58.8–74.5 Pa/l×s⁻¹), which may account for the previously-reported lack of significant subjective or physiological differences when wearing PRs with these low R filter. Lowering filtering facepiece respirator R filter below 88.2 Pa (measured at 85 l/min constant airflow) may not result in additional subjective or physiological benefit to the wearer.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2015, 28, 1; 71-80
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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