نتایج جستجو برای: hourglass constriction
تعداد نتایج: 16501 فیلتر نتایج به سال:
The formulae relating the luminosity to the transverse beam sizes as determined by luminosity scans, are derived with the hourglass e ect properly taken into
Living organisms have developed a multitude of timing mechanisms--"biological clocks." Their mechanisms are based on either oscillations (oscillatory clocks) or unidirectional processes (hourglass clocks). Oscillatory clocks comprise circatidal, circalunidian, circadian, circalunar, and circannual oscillations--which keep time with environmental periodicities--as well as ultradian oscillations,...
This article examines the meanings of “attack” in international law. It points out that the term is used in two distinct bodies of that law. First, the term “armed attack” appears in the jus ad bellum, which governs when a State may resort to force as an instrument of its national policy. In that context, it serves as a condition precedent to the resort to force in self-defence pursuant to Arti...
The traditional theory of the just war comprises two sets of principles, one governing the resort to war ( jus ad bellum) and the other governing the conduct of war ( jus in bello). The two sets of principles are regarded, in Michael Walzer’s words, as “logically independent. It is perfectly possible for a just war to be fought unjustly and for an unjust war to be fought in strict accordance wi...
Ionotronics An hourglass measures time by a regulated flow of sand through narrow neck. In article number 2213677, Jianyu Li and co-workers show that with similar shapes, ionic junctions regulate ion flow, allowing unidirectional current conduction. Like in an hourglass, microgels can be the building blocks such ionotronics to achieve printability tough mechanics. The are critical elements worl...
Reliability in flip chip and Ball Grid Array is a major concern. Solder joint geometry is extremely important from a reliability point of view. Commonly, the flip chip solder bump takes on the shape of a spherical segment. Mathematical calculations and finite element modeling have shown that the hourglass-shaped solder bumps experience the lowest plastic strain and have the longest lifetime. In...
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