105 research outputs found
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Study of Fisheye Lens Attachments for Mobile Phone Lenses
Fisheye lenses have a very special lens structure with an extremely wide field of view of about 170 degrees or more. They have some unique specifications, such as 100 percent barrel distortion, one of four different mapping functions, and relative illumination that does not follow the cos^4âĄă(Ξ)ă law. Based on these properties, fisheye lenses are popular in some scientific applications and panoramic photography.
With the development of high-quality smartphone cameras, more and more people use their smartphone instead of dedicated cameras in their daily lives. Convertible smartphone camera kits can expand the photographic capabilities of smartphone cameras, and fisheye lens adapters are one type of kit.
In this thesis, five systems, three having all spherical surfaces, are presented. They all have over 170 degrees field of view with an magnification more than 0.5 and achieve an RMS wavefront error less than 0.5 waves. An analysis for aberration correction as well as relative illumination is discussed in detail.
In the last chapter, a slanted edge test is utilized to measure and analyze a commercial fisheye adapterâs MTF performance
Equivariant -test configurations of polarized spherical varieties
Let be a connected, complex reductive Lie group and a spherical
homogenous space. Let be a polarized -variety which is a spherical
embedding of . In this paper we classify -equivariant normal -test configurations of via combinatory data. In particular we
classify the special ones, and prove a finiteness theorem of central fibres of
-equivariant special -test configurations. Also, as an
application we study the semistable degeneration problem of a -Fano
spherical variety.Comment: We added some Remarks 3.11, 5.5 and corrected some typo
Weighted K-stability of -Fano spherical varieties
Let be a connected, complex reductive Lie group and a spherical
homogeneous space. Let be a -Fano -spherical variety. In this
paper we compute the weighed non-Archimedean functionals of a -equivariant
normal test configurations of via combinatory data. Also we define a
modified Futaki invariant with respect to the weight , and given an
expression in terms of intersection numbers. Finally we show the equivalence of
different notations of stability and gives a stability criterion on -Fano spherical varieties, which is also a criterion of existence of
K\"ahler-Ricci -solitons
freeQuant: A Mass Spectrometry Label-Free Quantification Software Tool for Complex Proteome Analysis
Nudel functions in membrane traffic mainly through association with Lis1 and cytoplasmic dynein
Nudel and Lis1 appear to regulate cytoplasmic dynein in neuronal migration and mitosis through direct interactions. However, whether or not they regulate other functions of dynein remains elusive. Herein, overexpression of a Nudel mutant defective in association with either Lis1 or dynein heavy chain is shown to cause dispersions of membranous organelles whose trafficking depends on dynein. In contrast, the wild-type Nudel and the double mutant that binds to neither protein are much less effective. Time-lapse microscopy for lysosomes reveals significant reduction in both frequencies and velocities of their minus endâdirected motions in cells expressing the dynein-binding defective mutant, whereas neither the durations of movement nor the plus endâdirected motility is considerably altered. Moreover, silencing Nudel expression by RNA interference results in Golgi apparatus fragmentation and cell death. Together, it is concluded that Nudel is critical for dynein motor activity in membrane transport and possibly other cellular activities through interactions with both Lis1 and dynein heavy chain
Patients\u27 Acceptance of Smartphone Health Technology for Chronic Disease Management: A Theoretical Model and Empirical Test
Les quatre textes ont en commun de prĂ©senter certaines Ă©volutions rĂ©centes de lâhistoire politique en Allemagne. Ils prennent tous position face Ă trois tournants historiographiques. La notion dâhistoire culturelle du politique peut servir dâemblĂšme au premier de ces tournants : le politique est envisagĂ© non plus comme une succession dâĂ©vĂ©nements ni comme le fruit de dĂ©terminations structurelles dont il serait la superstructure ou lâĂ©cume, mais comme lâexpression de valeurs et de procĂ©dures o..
Atypical radio pulsations from magnetar SGR 1935+2154
Magnetars are neutron stars with extremely strong magnetic fields, frequently
powering high-energy activity in X-rays. Pulsed radio emission following some
X-ray outbursts have been detected, albeit its physical origin is unclear. It
has long been speculated that the origin of magnetars' radio signals is
different from those from canonical pulsars, although convincing evidence is
still lacking. Five months after magnetar SGR 1935+2154's X-ray outburst and
its associated Fast Radio Burst (FRB) 20200428, a radio pulsar phase was
discovered. Here we report the discovery of X-ray spectral hardening associated
with the emergence of periodic radio pulsations from SGR 1935+2154 and a
detailed analysis of the properties of the radio pulses. The complex radio
pulse morphology, which contains both narrow-band emission and frequency
drifts, has not been seen before in other magnetars, but is similar to those of
repeating FRBs - even though the luminosities are many orders of magnitude
different. The observations suggest that radio emission originates from the
outer magnetosphere of the magnetar, and the surface heating due to the
bombardment of inward-going particles from the radio emission region is
responsible for the observed X-ray spectral hardening.Comment: 47 pages, 11 figure
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