نتایج جستجو برای: in recent decade
تعداد نتایج: 17012674 فیلتر نتایج به سال:
The scaling laws that control the efficiency of converting ground-based HF power to ELF power by using modulation of the polar electrojet current is discussed. The analysis is based on kinetic calculations of the modification of the ionospheric conductivity by HF waves in conjunction with the experimental results reported from the Tromso Max Planck and the Alaska high power auroral simulation (...
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I present a practical configuration space computation algorithm for pairs of curved planar parts based on the general algorithm developed by Bajaj and me. The general algorithm advances the theoretical understanding of configuration space computation, but is too slow and fragile for some applications. The new algorithm solves these problems by restricting the analysis to parts bounded by line s...
We present the result of searches for gravitational waves from 200 pulsars using data from the first observing run of the Advanced LIGO detectors. We find no significant evidence for a gravitationalwave signal from any of these pulsars, but we are able to set the most constraining upper limits yet on their gravitational-wave amplitudes and ellipticities. For eight of these pulsars, our upper li...
We have previously shown that regulatory T cells (Treg) accumulate dramatically in aged animals and negatively impact the ability to control persistent infection. However, the mechanisms underlying the age-dependent accrual of Treg remain unclear. In this study, we show that Treg accumulation with age is progressive and likely not the result of increased thymic output, increased peripheral prol...
T lymphopoiesis in the thymus was thought to be completed once it reaches the single positive (SP) stage, a stage when T cells are "fully mature" and waiting to be exported at random or follow a "first-in-first-out" manner. Recent evidence, however, has revealed that the newly generated SP thymocytes undergo a multistage maturation program in the thymic medulla. Such maturation is followed by a...
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