scholarly journals Field-Aligned Currents in Saturn's Nightside Magnetosphere: Subcorotation and Planetary Period Oscillation Components During Northern Spring

2018 ◽  
Vol 123 (5) ◽  
pp. 3602-3636 ◽  
Author(s):  
T. J. Bradley ◽  
S. W. H. Cowley ◽  
G. Provan ◽  
G. J. Hunt ◽  
E. J. Bunce ◽  
...  
Keyword(s):  
Period Oscillation

scholarly journals Revealing the interference effect of Majorana fermions in a topological Josephson junction

2018 ◽  
Vol 9 ◽  
pp. 520-529 ◽  
Author(s):  
Jie Liu ◽  
Tiantian Yu ◽  
Juntao Song
Keyword(s):  
Josephson Junction ◽  
Interference Effect ◽  
Josephson Effect ◽  
Andreev Reflection ◽  
Local Density ◽  
Localized States ◽  
Majorana Fermions ◽  
Local Density Of States ◽  
Single Side ◽  
Period Oscillation

We study theoretically the local density of states (DOS) in a topological Josephson junction. We show that the well-known 4π Josephson effect originates from the interference effect between two Majorana fermions (MFs) that are localized at the Josephson junction. In addition, the DOS for electrons (holes) shows the 4π interference information along each parity conserved energy spectrum. The DOS displays a 2π period oscillation when two trivial states interfere with each other. This means that the DOS information may be used to distinguish the MFs from trivial localized states. We suggest that the interference effect and the DOS can be detected by using two STM leads or two normal leads. A single side lead can only detect the Andreev reflection tunneling process in the junction, which cannot reveal information about the interference effect in general. However, using two side leads, we can reveal information about the interference effect of the MFs as well as the DOS by combining Andreev reflection with the electron transmission process.

Effects of Parameters on the Two-Phase Flow Instability in a Microchannel

2018 ◽  
Author(s):  
Yefei Liu ◽  
Yang Liu ◽  
Xingtuan Yang ◽  
Liqiang Pan
Keyword(s):  
Heat Flux ◽  
High Speed ◽  
Flow Instability ◽  
Working Fluid ◽  
Two Phase ◽  
Short Period ◽  
Period Oscillation ◽  
Data Acquisition Card ◽  
Series Of Experiments ◽  
Vertical Microchannel

Series of experiments are conducted in a single microchannel, where subcooled water flows upward inside a transparent and vertical microchannel. The cross section of the channel is rectangle with the hydraulic diameter of 2.8mm and the aspect ratio of 20. The working fluid is 3–15K subcooled and surface heat flux on the channel is between 0–3.64 kW/m2, among which two-phase instability at low vapor quantity may occur. By using a novel transparent heating technique and a high-speed camera, visualization results are obtained. The parameters are acquired with a National Instruments Data Acquisition card. In the experiments, long-period oscillation and short-period oscillation are observed as the primary types of instability in a microchannel. Instability characteristics represented from signals correspond well with the flow pattern. Moreover, effects of several parameters are investigated. The results indicate that the oscillating period generally increases with the heat flux density and decreases with inlet subcooling, while the effects of inlet resistance are more complex.

scholarly journals Changes in the strength and width of the Hadley Circulation since 1871

2012 ◽  
Vol 8 (4) ◽  
pp. 1169-1175 ◽  
Author(s):  
J. Liu ◽  
M. Song ◽  
Y. Hu ◽  
X. Ren
Keyword(s):  
20Th Century ◽  
Global Climate ◽  
Hadley Circulation ◽  
Recent Change ◽  
Early 20Th Century ◽  
Greenhouse Warming ◽  
Long Period ◽  
The Past ◽  
Period Oscillation

Abstract. Recent studies demonstrate that the Hadley Circulation has intensified and expanded for the past three decades, which has important implications for subtropical societies and may lead to profound changes in global climate. However, the robustness of this intensification and expansion that should be considered when interpreting long-term changes of the Hadley Circulation is still a matter of debate. It also remains largely unknown how the Hadley Circulation has evolved over longer periods. Here, we present long-term variability of the Hadley Circulation using the 20th Century Reanalysis. It shows a slight strengthening and widening of the Hadley Circulation since the late 1970s, which is not inconsistent with recent assessments. However, over centennial timescales (1871–2008), the Hadley Circulation shows a tendency towards a more intense and narrower state. More importantly, the width of the Hadley Circulation might have not yet completed a life-cycle since 1871. The strength and width of the Hadley Circulation during the late 19th to early 20th century show strong natural variability, exceeding variability that coincides with global warming in recent decades. These findings raise the question of whether the recent change in the Hadley Circulation is primarily attributed to greenhouse warming or to a long-period oscillation of the Hadley Circulation – substantially longer than that observed in previous studies.

scholarly journals A MULTI-PERIOD OSCILLATION IN A STELLAR SUPERFLARE

2015 ◽  
Vol 813 (1) ◽  
pp. L5 ◽  
Author(s):  
C. E. Pugh ◽  
V. M. Nakariakov ◽  
A.-M. Broomhall
Keyword(s):  
Period Oscillation

Origin of short period oscillation near GaAs band-gap energy in photoreflectance

1997 ◽  
Vol 102 (4) ◽  
pp. 283-286
Author(s):  
Insun Hwang ◽  
Jae-Eun Kim ◽  
Hae Yong Park ◽  
C.D. Lee ◽  
Sam Kyu Noh
Keyword(s):  
Band Gap ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Short Period ◽  
Period Oscillation

Asymptotic analysis of the classical aircraft stability equations

1999 ◽  
Vol 103 (1020) ◽  
pp. 95-103 ◽  
Author(s):  
W. R. Graham
Keyword(s):  
Asymptotic Analysis ◽  
Natural Frequencies ◽  
A Priori ◽  
New Approach ◽  
Advanced Level ◽  
Analytical Approximations ◽  
Short Period ◽  
Period Oscillation ◽  
Dutch Roll ◽  
Two Degree Of Freedom

Abstract A new approach to deriving analytical approximations for the free modes of motion of an aircraft is presented. Based on an asymptotic analysis, it eliminates the need for a priori assumptions regarding the characteristic motion of each mode, and is thus particularly suitable for an introductory exposition. In its basic form, it yields expressions for natural frequencies, damping factors and time constants which agree, to leading order, with well established results. At a more advanced level, it allows us to assess the validity of these results. In particular, we find that the two degree-of-freedom approximations to the short period oscillation and Dutch roll are asymptotically incorrect. This is unlikely to have a significant effect on the accuracy of the former, but is the reason for the poor damping predictions of the latter.

scholarly journals THE EFFECT OF LONG PERIOD OSCILLATION IN THE STORM SURGE

2002 ◽  
Vol 18 ◽  
pp. 125-130
Author(s):  
Hiroshi YOSHIOKA ◽  
Shigeatsu SERIZAWA ◽  
Tomotsuka TAKAYAMA
Keyword(s):  
Storm Surge ◽  
Long Period ◽  
Period Oscillation

scholarly journals On the similarity of the short-period pressure variation over large areas

1903 ◽  
Vol 71 (467-476) ◽  
pp. 134-135 ◽  
Keyword(s):  
South America ◽  
Barometric Pressure ◽  
Pressure Variation ◽  
Short Period ◽  
Period Oscillation ◽  
Distant Station

In a paper presented in June last to the Society, we pointed out the existence of a short-period oscillation of barometric pressure over the Indian area corresponding generally with a variation in, the percentage number of prominences recorded on the sun’s limb. This oscillation was further shown not to be limited to the Indian area, but to be marked at a far distant station, as Cordoba, in South America. The present paper, which is a continuation of this investigation, was undertaken to extend the research over a larger area.

scholarly journals Cyclic Period Oscillation of the Eclipsing Dwarf Nova DV UMa

2017 ◽  
Vol 153 (5) ◽  
pp. 238 ◽  
Author(s):  
Z.-T Han ◽  
S.-B Qian ◽  
Voloshina Irina ◽  
L.-Y Zhu
Keyword(s):  
Dwarf Nova ◽  
Period Oscillation
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