نتایج جستجو برای: upward and downward continuations
تعداد نتایج: 16828768 فیلتر نتایج به سال:
We study zero-temperature quantum spin chains, which are characterized by a nonvanishing current. For the XX model starting from the initial state mid R:cdots, three dots, centered upward arrow upward arrow upward arrow downward arrow downward arrow downward arrowcdots, three dots, centered we derive an exact expression for the variance of the total spin current. We show that asymptotically the...
ion, this results in an inherent asymmetry of upward vs. downward events. The properties of downward events described in the previous section do not hold for upward events; in fact the properties of upward events are essentially complementary to those of downward events: 1. Upward events need not be yielding. While the simple formulation of Handler in Section 2 does cause the lower level to yie...
Aims: The purpose of the present study was to investigate The Effect of a Scapular Stability Based Corrective Exercise Program on scapular upward rotation and scapulohumeral rhyhtm in Wheelchair Basketball(WB) Athletes with bilateral scapular downward rotation syndrome. Methods: According to the research conditions, 24 wheelchair basketball athletes with spinal cord injury were purposefully pa...
We study the size and the complexity of computingfinite state automata (FSA) representing and approximatingthe downward and the upward closure of Petri net languageswith coverability as the acceptance condition. We show how toconstruct an FSA recognizing the upward closure of a Petri netlanguage in doubly-exponential time, and therefore the size is atmost doubly exponent...
Previous reports suggest that distance influences horizontal stare OKN gains; however, the effect of distance on vertical OKN and look OKN is unknown. Horizontal and vertical look and stare OKN gains were recorded in 16 healthy volunteers (velocity 38.4 degrees /s) at three distances (0.3 m, 1 m, and 2.5 m) and two different stimulus sizes. Asymmetry of responses and correlation of gains in dif...
We analyze data from two FAST satellite passes in the vicinity of auroral surges (as seen in the VIS auroral imager on the Polar satellite) to study the large scale ionospheric electrodynamics of the surge, focusing in particular on the configuration of field-aligned and ionospheric currents. While most previous ground and satellite observations have found the surge to be a region of predominan...
The pathophysiology of spontaneous upbeat (UBN) and downbeat (DBN) nystagmus is reviewed in the light of several instructive clinical findings and experimental data. UBN due to pontine lesions could result from damage to the ventral tegmental tract (VTT), originating in the superior vestibular nucleus (SVN), coursing through the ventral pons and transmitting excitatory upward vestibular signals...
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