نتایج جستجو برای: chronometer
تعداد نتایج: 254 فیلتر نتایج به سال:
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...
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...
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...
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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