نتایج جستجو برای: chronometer

تعداد نتایج: 254  

Journal: :DMW - Deutsche Medizinische Wochenschrift 1913

2009
Motoo Ito

Introduction: Ca-Al-rich inclusions (CAIs) consist of high temperature minerals that represent the oldest known solid objects in the solar system. The CAIs are known to have contained the short-lived ra-dionuclide 26 Al, which decays to 26 Mg, and has a half-life of 0.72 Myr. The 26 Al-26 Mg decay system provides a high-resolution relative chronometer for the CAIs [e.g., 1]. However, the chrono...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2008
Stein B Jacobsen Michael C Ranen Michael I Petaev John L Remo Richard J O'Connell Dimitar D Sasselov

Measurable variations in (182)W/(183)W, (142)Nd/(144)Nd, (129)Xe/(130)Xe and (136)XePu/(130)Xe in the Earth and meteorites provide a record of accretion and formation of the core, early crust and atmosphere. These variations are due to the decay of the now extinct nuclides (182)Hf, (146)Sm, (129)I and (244)Pu. The (l82)Hf-(182)W system is the best accretion and core-formation chronometer, which...

Journal: :Applied sciences 2021

It is unclear how athletes regulate their performance prior and during exercise when deceptive methods are applied. Therefore, the aim of this study was to test if time manipulation can influence pacing strategy running performance. Ten recreationally active subjects were informed they would complete four 60-min trials only with feedback. The first session a familiarization trial (60-min), in f...

Journal: :Monthly Notices of the Royal Astronomical Society 1991

Journal: :Časopis pro pěstování matematiky a fysiky 1920

Journal: :Časopis pro pěstování matematiky a fysiky 1920

2015
Ralf Rapp Hendrik van Hees

Thermal dilepton radiation from the hot fireballs created in high-energy heavy-ion collisions provides unique insights into the properties of the produced medium. We first show how the predictions of hadronic many-body theory for a melting ρ meson, coupled with quark-gluon plasma emission utilizing a modern lattice-QCD based equation of state, yield a quantitative description of dilepton spectr...

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